JPH11241501A - Telescopic scaffold base and extensible plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working scaffold base telescopically having an upper plate which can be easily and steadily installed regardless of the size of an installing place and moreover the shapes of installing face, namely convex, concave and oblique, and can be accommodated in a compact shape, and a telescopic upper plate. SOLUTION: The upper ends of a pair of support legs 15, 16 are severally pivotally connected to both the ends of the upper plate 11 having a flat tread on an upper face through fold type connecting mechanisms 12, 13 so that the support legs 15, 16 may be fixed at a wholly closed leg position where the legs 15, 16 adhere closely to the back of the upper plate 11 and at a wholly opened leg position where they stand up from the back of the upper plate 11. In this case, the upper plate 11 is constructed so as to be axially extensible, and the support legs 15, 16 are also constructed so as to be axially telescopic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work platform and a telescopic top plate which can be used to perform various operations on a top plate.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG. 25, when remodeling a ceiling in an office, stepladders 122 and 123 are installed on both sides of a desk group 121 on which a personal computer 120 is installed. , 123, a top plate 124 is erected over the desk group 121, and
Working on 24. On the other hand, as shown in FIG. 26, in the remodeling work of a bathroom or a toilet in a general household, first, a top plate 126a is laid on the entire surface of the bathtub 125, and then a stepladder 126 (in addition, a chair or a ladder may be used). ) Is placed, and the remodeling work is performed on the stepladder 126.

[0003] In the work of painting a ceiling surface such as a staircase, as shown in FIG. 27, a frame 133 is constructed by connecting a plurality of single pipes 128 to 131 to a stair 127 using a free clamp 132. , The top plate 13 on the top of the frame 133
4 and the painting work can be performed on the top plate 134.

[0004]

However, when the scaffold is constructed using the stepladders 122, 123, 126 and the frame 133 described above, the installation place is narrow, so that there is a remarkable restriction, and in some cases, the scaffold cannot be constructed. There is a risk. Further, even if a scaffold can be constructed, there is a problem in terms of safety because the work must be performed in a cramped or unstable posture. Further, as shown in FIG. 27, it is necessary to use a variety of jigs to connect the plurality of single pipes 128 to 131 using the free clamp 132 and to construct the frame 133. And the installation time becomes longer.

[0005] The present invention has been made in view of such circumstances, and regardless of the installation location is wide and narrow,
Even if the installation surface is convex, concave, or inclined, it can be easily and stably installed, and can be stored in a compact form. The purpose is to provide a top plate.

[0006]

According to the present invention, there is provided a semiconductor device comprising:
The working scaffolding platform capable of expanding and contracting the top plate described above has upper ends of a pair of support legs at both ends of the top plate having a flat tread surface on an upper surface,
Each of the folding connection mechanisms is pivotally connected to the support leg in a fully closed position where the support leg is in close contact with the back surface of the top plate and a fully open position where the support leg stands from the back surface of the top plate, and the top plate is connected to the axis line. In addition to having a structure that can expand and contract in the direction, the support leg also has a structure that can expand and contract in the axial direction.

According to a second aspect of the present invention, there is provided a work scaffold for extending a top plate, wherein the support legs are spaced apart from each other by a predetermined distance in a width direction. A pair of struts extending vertically in a vertical direction, a plurality of treads extending horizontally between the struts with an interval in the vertical direction, a lower connecting pipe connecting lower ends of the struts, and an upper end outside the struts. An auxiliary column pivotally supported on the side surface and having a lower end extending below the lower end surface of the column and groundable on a floor or the like, and an auxiliary column interposed between the auxiliary column and the lower connecting pipe. A projecting amount adjusting tube for regulating the projecting amount of the auxiliary column in the width direction, the auxiliary column being pivotally supported on the outer surface of the column, and a swing leg. And a telescopic leg structure slidably fitted therein.

According to a third aspect of the present invention, there is provided a work scaffolding base capable of expanding and contracting a top plate, wherein the top plate has a flat rectangular hollow cross section. A first divided top plate, a second divided top plate having a flat rectangular hollow cross-section that is slidably fitted into the first divided top plate;
A top plate fixing mechanism capable of fixing the first and second divided top plates at a predetermined sliding position, wherein the upper surface of the first and second divided top plates forms the flat tread surface . The work scaffold according to claim 4 is capable of extending and retracting the top plate.
In the working scaffolding for expanding and contracting the top plate described above, upper and lower portions of the tread forming portions of the first and second divided top plates are vertically aligned with each other, and a concave groove is formed on the lower surface. First and second ridges formed and extending in the longitudinal direction are provided, and the projecting upper surface of the second ridge is slidably fitted in the longitudinal direction in the groove of the first ridge. I have.

According to a fifth aspect of the present invention, there is provided a work scaffolding base capable of extending and retracting a top plate according to the first or second aspect of the present invention. The base ends of a plurality of long rods arranged side by side are fixedly connected by a spacing member to form first and second comb-like divided top plates, and one of the long rods is divided Is slidably inserted in the axial direction into the gap between the long rods of the other divided top plate, and is point-symmetrical to both outer portions of the first and second divided top plates, respectively. A long auxiliary rod and a hollow rod for inserting an auxiliary rod are continuously provided, and the long auxiliary rod for one of the divided top plates is slidably inserted into the hollow rod for inserting an auxiliary rod of the other divided top plate. ,
Further, the outer surface of the long auxiliary rod of the one divided top plate is flush with the outer surface of the hollow rod for inserting the auxiliary rod of the other divided top plate without any step.

According to a sixth aspect of the present invention, the telescopic top plate has a first divided top plate having a flat rectangular hollow cross section, and a flat rectangular hollow cross section slidably fitted into the first divided top plate. A second divided top plate, and a top plate fixing mechanism capable of fixing the first and second divided top plates at a predetermined sliding position, wherein an upper surface of the first and second divided top plates A flat tread is formed.

According to a seventh aspect of the present invention, the extendable top plate is fixedly connected to the base ends of a plurality of long rods arranged in parallel with a parallel gap in the width direction by a spacing member to form a comb-shaped top plate. Forming a first and a second divided top plate, and inserting a leading end of a long rod of one divided top plate slidably in an axial direction into a gap between the long rods of the other divided top plate; and A long auxiliary rod and a hollow rod for inserting an auxiliary rod are connected to each other on both outer sides of the first and second divided top plates in a point-symmetric relationship, respectively.
The long auxiliary rod of one of the divided top plates is slidably inserted into the auxiliary rod insertion hollow rod of the other divided top plate. The side surface is flush with the outer surface of the auxiliary rod insertion hollow rod of the other divided top plate without any step.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. (First Embodiment) First, with reference to FIGS. 1 to 4, an overall configuration of a work scaffolding base A according to a first embodiment of the present invention, which is capable of expanding and contracting a top plate, will be described.

As shown in the figure, a working scaffold A capable of extending and retracting a top plate is substantially a top plate 11 composed of a horizontally long rectangular plate having a tread surface 10 on an upper surface, and upper and lower ends of the top plate 11 are respectively left and right. It is provided with a pair of support legs 15 and 16, which are foldably connected to the ends via fold connection mechanisms 12 and 13 and whose lower end is placed on a floor surface 14.

The top plate 11 has a structure in which two second divided top plates 18 are slidably fitted into one first divided top plate 17 and can be expanded and contracted in the horizontal direction (axial direction). Have. The rear portions of the second divided top plates 18 are integrally connected by rear connecting ribs. Further, the top plate 11 is fixed at an arbitrary telescopic position by the top plate fixing mechanism 19,
The length of the top plate 11 can be adjusted. On the other hand, each of the support legs 15 and 16 has a ladder structure, and has a structure that can expand and contract in a vertical direction (axial direction) in principle. That is, each of the support legs 15 and 16 includes a pair of columns 20, 21, 22, and 23 extending in the vertical direction at predetermined intervals in the front-rear direction, as viewed from the side shown in FIGS. , 21, 22, and 23 are formed from a plurality of treads 24, 25 which are suspended horizontally in the vertical direction.

Each of the columns 20 to 23 is
An upper end is composed of a fixed leg 26 foldably connected by the foldable connection mechanisms 12 and 13 described above, and a telescopic leg 27 slidably fitted into the fixed leg 26. Also,
The leg fixing mechanism 28 fixes the telescopic leg 27 to the fixed leg 26 at an arbitrary telescopic position.
23 can be adjusted in height.

Next, the structure of each part of the work scaffold A, which is capable of expanding and contracting the top plate having the above-described overall structure, will be described in detail. First, the configuration of the top plate 11 will be described. In FIG. 1, the first divided top plate 17 forming the left half of the top plate 11 has a flat rectangular hollow cross section as shown in FIG. A tread forming portion 29 formed of a flat and vertically long rectangular plate having a width equal to the width of the plate 11, channel portions 30 and 31 continuously provided on left and right side edges of the tread forming portion 29, and a central portion of the tread forming portion 29 And an I-shaped support beam 32 continuously provided on the back surface. Then, between the channel portion 30 and the I-shaped support beam 32 and between the channel portion 31 and the I-shaped support beam 3
2, a divided top plate storage space is formed.

On the other hand, the two second divided top plates 18 forming the right half of the top plate 11 in FIG. 1 each have a flat rectangular hollow cross section as shown in FIG. The tread surface forming portion 33 is formed of a flat and vertically long rectangular plate having a width of about half the width, and the channel portions 34 and 35 are provided continuously on the left and right side edges of the tread forming portion 33. Each of these second divided top plates 18 is slidably stored in a divided top plate storage space provided in the first divided top plate 17. Note that synthetic resin plates 30a, 31a, 32a are attached to the inner surfaces of the channel portions 30, 31, and the I-shaped support beam 32 in order to smoothly slide the second divided top plate 18. Further, as clearly shown in FIG. 5, in the present embodiment, the upper surfaces of the first and second divided top plates 17, 18 which are vertically aligned with the tread forming portions 29, 33 are respectively upward. A plurality of first and second ridges 29a, 33a having a trapezoidal section extending in the longitudinal direction and having a concave groove formed on the lower surface and extending in the longitudinal direction are provided. The protruding upper surface of the second ridge 33a is slidably fitted in the longitudinal direction in the concave groove of the first ridge 29a. The strength is increased, and side-shifting when sliding relatively is prevented. In addition,
The widths of the first and second ridges 29a, 33a are respectively
Although the distance between the first protrusions 29a and the distance between the second protrusions 33a is smaller, they may be the same or wider. Further, as shown in FIG. 5, the first and second divided top plates 1
7, 18 channel sections 30, 31, 34, 35 and I
A plurality of third and fourth ridges 30b, 31b, 32b, 3b, 3b having a trapezoidal cross-section extending in the longitudinal direction with an upper surface protruding upward and a concave groove formed in the lower surface are also formed on the support beam 32, respectively.
2c, 34a and 35a are provided. And the fourth
The third ridges 30b, 3b are provided in the concave grooves of the ridges 34a, 35a.
The protruding upper surfaces of 1b, 32b, 32c are slidably fitted in the longitudinal direction, and the first and second divided top plates 17,
In this case, the lateral displacement when the members 18 are relatively slid can be more effectively prevented.

Next, the structure of a top plate fixing mechanism 19 that can fix the top plate 11 composed of the first divided top plate 17 and the second divided top plate 18 at an arbitrary expansion / contraction position will be described with reference to FIGS. , FIG.
This will be described with reference to FIG. As shown in FIGS. 1 to 3, the top plate fixing mechanism 19 is mounted on one side wall 37 located near an insertion end portion 36 into which the first divided top plate 17 fits the second divided top plate 18. Have been.

As shown in FIGS. 6 and 7, along a side wall 37 of the fitting end 36 of the first divided top plate 17, a pin holding case 38 having a hollow rectangular cross section with both longitudinal ends opened. The inner wall 39 is fixed to one side wall 37 of the first divided top plate 17. In the center portions of the outer walls 39 and 40 of the pin holding case 38, the first divided top plate 17 has first
And second through holes 41 and 42 are formed. further,
A third through-hole 43 is formed at a position where the first side plate 37 is aligned with the first and second through-holes 41 and 42 on one side surface 37. A lock pin 44 is provided in the pin holding case 38 so as to be able to advance and retreat in a state of penetrating these through holes 41 to 43.

A plurality of fourth through holes 45 are provided on the side wall of the second divided top plate 18 corresponding to one side wall 37 of the first divided top plate 17 at intervals in the longitudinal direction. I have. Then, the second divided top plate 18 is expanded and contracted with respect to the first divided top plate 17, and any of the fourth through holes 45 is selectively inserted into the first to third transparent holes. After being aligned with the holes 41 to 43, the lock pin 44 is advanced toward the fourth through hole 45 and inserted therethrough so that the second split top plate 17 is inserted into the second divided top plate 17.
Can be fixed. On the other hand, by retracting the lock pin 44 from the fourth through hole 45,
The fixing of the first divided top plate 17 and the second divided top plate 18 can be released.

Various mechanisms are conceivable as a mechanism for moving the lock pin 44 forward and backward. In this embodiment, the structure is as shown in FIGS. 6 and 7. That is, an operation plate 49 having a gripping piece 46 at one end and a flat portion 47 and a bent portion 48 at the other end is formed, and the flat portion 47 and the bent portion 48 of the operation plate 49 can be freely moved into and out of the pin holding case 38. It is arranged in. Lock pin 4 on flat portion 47 and bent portion 48
An elongated hole 51 is provided to slidably fit the reduced diameter portion 50 provided in the middle of 4 in the longitudinal direction. Also, the pin holding case 3
Inside 8, a leaf spring 52 for constantly urging the lock pin 44 in the advance direction is provided.

Next, with reference to FIGS. 2, 8 and 9, the structure of the folding connection mechanisms 12, 13 will be described. As shown in the drawing, they have the same configuration except that they are arranged symmetrically in a front view,
The movable plates 55, 56 fixed to the upper ends of the support legs 15, 16 are fixed to the fixed plates 53, 54 fixed to both ends of the movable legs 55, 56.
Are rotatably connected by pivots 57 and 58.

The specific configuration of the folding connection mechanism 12 is as follows.
A specific description will be given with reference to FIGS. Note that the fold connection mechanism 13 has the same configuration as the fold connection mechanism 12, and a description thereof will be omitted.

As shown in FIGS. 8 and 9, the movable plate 55
Is partially supported by the fixed plate 53 by a pivot 57 while a part thereof is always superimposed on the fixed plate 53. And
As shown by the solid line, the channel portion 3 of the first divided top plate 17 is located at the fully opened position where the support leg 15 makes a predetermined angle (for example, 70 ° to 120 °) with the back surface of the top plate 11.
The through-holes 59 and 60 provided in alignment with the end of the movable plate 55 and the fixed plate 53 are aligned with the first through-hole 61 provided at a position separated from the pivot 57 of the movable plate 55. And
In this fully opened position, the lock pin 63 attached to the one end 17a of the first divided top plate 17 in a state of being urged by the spring 62 in the advance direction is inserted into the through holes 59, 6.
0, 61, the movable plate 55 can be fixed to the fixed plate 53, and the support legs 15
1 can be fixed to one end to maintain the open leg state. Reference numeral 17b denotes an attachment for attaching the lock pin 63 to the one end 17a.

As shown by the imaginary lines, the support legs 15,
In the fully closed position where 16 is in close contact with the back surface of the top plate 11,
The through holes 59, 60 provided in alignment with the end of the channel portion 30 of the first divided top plate 17 and the fixed plate 53 are located at positions separated from the pivot 57 of the movable plate 55 and the first through hole 61. Can be aligned with the second through hole 64 provided in the first through hole. In this fully closed position, the lock pin 63
Through the through holes 59, 60, 64, the movable plate 55 can be fixed to the fixed plate 53, and the support leg 15 can be fixed to one end of the top plate 11 to maintain the closed leg state. . 11 and 12 show the support leg 1.
5 and 16 show a state in which the legs are completely closed with respect to the top plate 11.

Next, with reference to FIG. 10, the structure of the leg fixing mechanism 28 that can fix the telescopic leg 27 to the fixed leg 26 at an arbitrary telescopic position will be described. As shown in the figure, the leg fixing mechanism 28 substantially includes a rack 6 formed on the surface of the inner wall 65 of the telescopic leg 27 having a hollow rectangular cross section.
6, a rack shoe 67 attached between the lower end of the channel-shaped (lip groove-shaped) fixed leg 26 and the lowermost step rail 24, and the rack shoe 67 is elastically urged toward the rack 66. It comprises a spring 68 which is an example of an elastic means to be engaged, and an engagement releasing means 69 for releasing the engagement between the rack 66 and the rack shoe 67 described above. Preferably, a through hole is provided in a rack groove formed between rack teeth constituting the rack 66.

With this configuration, by operating the engagement releasing means 69 to release the engagement between the rack 66 and the rack shoe 67, the telescopic leg 27 can be slid with respect to the fixed leg 26. When the operation of the disengagement means 69 is stopped at the position, the rack 66 and the rack shoe 67 are again engaged by the urging force of the spring 68, so that the telescopic leg 27 is fixed at the predetermined sliding position.
Can be fixed.

Next, various modes in which the work scaffold A capable of expanding and contracting the top plate having the above-described structure and various works that can be performed by the work scaffold A will be described with reference to FIG. This will be described with reference to FIGS.

First, with reference to FIGS. 1 to 4, a description will be given of a basic mode in which a work platform A capable of expanding and contracting a top plate can be used. 1 to 4 show a case where the work scaffold A capable of extending and retracting the top plate extends the top plate 11 to almost the maximum length and extends the support legs 15 and 16 to the maximum length. As described above, in the normal use form, the tread surface 10 having a sufficient length can be secured, and a sufficient height can be secured. In addition, about the height,
In this embodiment, the step bar 24 has two steps.
By setting the number of steps or more, not only the basic height (height at the time of expansion and contraction) but also the maximum height (height at the time of maximum elongation) can be easily increased.

Further, when the top board 11 is contracted, the work scaffolding A for extending and retracting the top board can take a form shown by a virtual line, and can be easily carried into a narrow work site. ,
Can be placed in a stable state. If necessary, support leg 1
By shrinking 5 and 16, furthermore, it can be easily carried into a narrow work site and can be placed in a stable state. Further, in the case of storage, as described above, the folding connection mechanisms 12 and 13 can be operated to make the extremely compact structure shown in FIGS. 11 and 12.

Next, with reference to FIGS. 13 to 17, other forms in which the work platform A capable of expanding and contracting the top plate and various types of work that can be performed by the work platform A will be described. The operation will be described.

FIG. 13 shows a case where the ceiling is remodeled in the office. The ceiling plate 11 is extended to almost the maximum length, and the support legs 15, 16 are extended to the maximum length. The work scaffolding table A, which is capable of expanding and contracting a plate, can be easily and stably placed across the desk group 71 on which the personal computer 70 is installed.

FIG. 14 shows a case where a bathroom 72 is remodeled in an ordinary household. The top plate 11 is reduced in accordance with the size of the bathroom 72, and the support legs 15, 16 are also reduced in accordance with the height of the bathroom 72. This makes it possible to easily and stably set the work scaffold A capable of expanding and contracting the top plate in the bathroom 72.
Can be installed on the high floor surface 72b around the bathtub 72a.

FIG. 15 shows a case where the ceiling on the stairs 73 and 74 is painted. When the stairs 73 have a steep slope,
As shown by the solid line, while the top plate 11 is in a contracted state, one support leg 15 is extended to the maximum, and the other support leg 1 is extended.
By operating the folding connection mechanism 13 so that the folding work 6 is completely bent inward, the work platform A capable of expanding and contracting the top plate can be installed on the stairs 73 in a stable state. A horizontal tread 10 can be formed on the plate 11.

On the other hand, when the gradient of the stairs 74 is gentle,
As shown by the imaginary line, the top plate 11 was extended, the one support leg 15 was extended to the maximum, and the other support leg 16 was completely folded inward by operating the folding connection mechanism 13. By setting it in the state, the work platform A capable of expanding and contracting the top plate can be installed on the stairs 74 in a stable state, and the horizontal tread surface 10 having a sufficient length can be formed on the top plate 11. it can.

FIG. 16 shows a case in which a work scaffold A capable of expanding and contracting a top plate is used for various works on the stairs 75. While extending the top plate 11 to the maximum length and contracting the support legs 15,
With the support leg 16 on the opposite side extended to the maximum length, the stairs 7
Set at 5. At this time, when the top 11 is inclined as shown by a virtual line, the length of the top 11 is reduced,
The level of the tread 10 can easily be set.

FIG. 17 also shows a case in which a work scaffolding table A with a top plate that can be extended and contracted is used for various constructions on the stairs 77. In this case, if the ceiling 78 has a gentle gradient,
By adjusting the length of the ceiling 7,
8 and the ceiling 78 and the top plate 11
Can be kept constant. Therefore, the worker can work in the same posture. As described above, the work scaffold A capable of expanding and contracting the top plate according to the present embodiment includes:
Regardless of whether the installation location is large or small, and even if the installation surface is a convex surface, a concave surface, or an inclined surface, it can be easily and stably installed, and can be stored in a compact form.

(Second Embodiment) Next, FIGS.
With reference to FIG. 4, a description will be given of the overall configuration of a work scaffold A1 according to a second embodiment of the present invention, which is capable of expanding and contracting a top plate. As shown in FIG. 18 and FIG. 19, the work scaffold A1 substantially includes a top plate 81 formed of a horizontally long rectangular plate having a tread surface 80 on the upper surface, and a top end thereof is folded at the left and right ends of the top plate 81. A pair of support legs 8, which are foldably connected via tatami connection mechanisms 82, 83 and whose lower ends are placed on the floor surface 84.
5 and 86 are provided.

As shown in FIGS. 18 to 21, the support leg 85 (same for the support leg 86) extends in a substantially vertical direction at a predetermined interval in the width direction, and has a top plate 81 at the upper end. And a pair of left and right columns 87 and 88 connected to the ends of the pair via folding connection mechanisms 82 and 83, and a plurality of laterally spaced columns vertically spaced between the left and right columns 87 and 88. Stepping bar 89
And a lower connecting pipe 90 for connecting the lower ends of the left and right columns 87 and 88 to each other, and an upper end pivotally supported by the outer surfaces of the left and right columns 87 and 88 and a lower end to the left and right columns 87. , 88
Left extending from the lower end face of
The right and left auxiliary columns 91 and 92 are interposed between the left and right auxiliary columns 91 and 92 and the lower connecting pipe 90, and the left and right auxiliary columns 9 are provided.
There are left and right overhang amount adjusting tubes 93 and 94 for regulating the overhang amounts in the width direction of 1, 92.

As shown in FIGS. 22 and 24, the left and right auxiliary columns 91 and 92 have telescopic tube structures in which telescopic legs 96 are slidably inserted into swinging legs 95, respectively. And a fixing device 97 that can fix the telescopic leg 96 at an arbitrary telescopic position. Further, as shown in FIGS. 22 and 24, a telescopic tube structure is formed by nestably inserting left and right overhanging amount adjusting tubes 93 and 94 into both ends of the lower connecting tube 90. In addition, a fixing device 98 that can fix the left and right overhanging amount adjusting tubes 93 and 94 at arbitrary expansion and contraction positions is provided.

Also, in the present embodiment, similarly to the first embodiment, the top plate 81 has a structure which is composed of the first and second divided top plates 99 and 100 and can be extended and contracted in the axial direction. doing. That is, as shown in FIG. 19 and FIG.
The second divided top plates 99 and 100 respectively hold the base ends of a plurality of long rods 101 and 102 formed of hollow rectangular tubes arranged in parallel with parallel gaps G1 and G2 in the width direction, with a spacing member 103, 104 are formed in a comb-like shape by being fixedly connected using rivets or the like. The ends of the long rods 101 (102) of the divided top plate (the first divided top plate 99 or the second divided top plate 100) are respectively connected to the other divided top plate (the second divided top plate 100). Or the first divided top plate 9
9) Gap G2 (G) between long rods 102 (101)
1) is slidably inserted in the axial direction. With this configuration, the first and second divided top plates 99 and 100 can expand and contract with each other, and the length of the top plate 81 can be adjusted.

Further, in this embodiment, as shown in FIGS. 19 and 21, the first and second divided top plates 99, 10
0, the long auxiliary rods 105 and 106 and the hollow rod 107 for inserting the auxiliary rod in a point symmetry
108, one of the divided top plates 99 (10
0) The long auxiliary rod 105 (106) is the hollow rod 108 for inserting the auxiliary rod of the other divided top plate 100 (99).
It is slidably inserted in (107). The long auxiliary rod 105 (10) of one of the divided top plates 99 (100)
The outer surface of 6) is made flush with the outer surface of the auxiliary rod insertion hollow rod 108 (107) of the other divided top plate 100 (99) without any step. Therefore, FIG.
As shown in FIG. 9 and FIG. 21, the top plate 81 has the same width over the entire length in both the extended state and the contracted state, so that safety of work can be ensured.

In the present embodiment, as shown in FIGS. 19, 21 and 23, the long rods 101, 10
2 is formed by binding bands 109 and 110 having a U-shaped cross section, which are disposed in a state of being sandwiched from above and below the same.
It is bound using rivets 111. By using the binding bands 109 and 110, it is possible to prevent the variation of the long rods 101 and 102 and to guide the relative sliding of the long rods 101 and 102. The plates 99 and 100 can smoothly slide relative to each other. In addition, this binding band 109,
110, the first and second divided top plates 99, 100
Can be prevented from being separated, and the connection strength of a certain level or more can be ensured, and the safety of the worker working on the top plate 81 can be ensured.

Explaining another structure in the above embodiment, the fixing device 97 shown in FIG. 24 has the same structure as the fixing device 28 in the first embodiment. That is, a rack groove is provided on the outer surface of the telescopic leg 96, and a rack tooth provided in the fixing device 97 and urged in the engaging direction by a spring is detachably engaged with the rack groove. . Therefore, the height from the floor surface 84 to the top plate 81 can be adjusted by engaging the rack teeth with the rack grooves by the fixing device 97 after extending the extendable leg 96 by an arbitrary length.

The fixing device 28 shown in FIG. 1 also has the same configuration as the fixing device disclosed by the present applicant in Japanese Patent Application Laid-Open No. 9-177460. That is, in FIG. 24, the left overhang amount adjusting tube 93 (the right overhang amount adjusting tube 94)
The same is true. A leaf spring is bent and stored in a U-shape on the inner side of the end of the bracket, and a convex portion is formed at one end of the leaf spring. And a positioning pin 112 is attached to the other end of the leaf spring so that a positioning hole 113 provided on the side wall of the lower connecting tube 90 and through holes provided in the left and right overhanging amount adjusting tubes 93 and 94 can be inserted. I have. The lower connecting pipe 90 is provided with a plurality of positioning holes 113 and 114.

With this configuration, the positioning pin 112
Is pushed into the inside of the lower connecting tube 90 to release the fitting state of the positioning pin 112, the positioning hole 113 and the through hole, so that the left overhanging amount adjusting tube 93 can be slid. It has become. Also, left,
When the positioning pin 112 comes to the position of the positioning holes 113 and 114 by sliding the right overhang amount adjusting tubes 93 and 94,
The positioning pin 112 and the positioning hole 113 (114) again
And the through holes are fitted to each other, so that the left and right overhanging amount adjusting tubes 93 and 94 are not allowed to slide from the lower connecting tube 90, and the left and right overhanging amount adjusting tubes 93 and 94 are overhanged to the left and right outside. Can be adjusted. Note that FIG.
In the embodiment shown in FIG. 4, the positioning holes 113 and 114 are provided at two places on the left and right, so that the left and right overhang amount adjusting tubes 9 are provided.
The overhang amounts of 3, 94 can be regulated in two stages.

In FIG. 24, a receiving tube 115 made of a short cylinder is attached to the end of each of the left and right overhang amount adjusting tubes 93 and 94 by a pivot pin 116 so as to be swingable. The swinging leg 95 is slidably held by the receiving member 115. Therefore, even if the left and right overhanging amount adjusting tubes 93 and 94 expand and contract, the receiving member 115 can move the left and right overhanging amount adjusting tubes 93 and 94.
Since it swings with respect to the 94 and slides with respect to the swing leg 95, the left and right overhanging amount adjusting tubes 93 and 94 can be kept in a horizontal state. Further, as shown in FIGS. 18 to 21, the first and second split top plates 99 and 100 are fixed at arbitrary expansion and contraction positions, and are the same as the top plate fixing mechanism 19 used in the first embodiment. Top plate fixing mechanism 117 having the following configuration:
Are attached to the top plate 81.

Next, a description will be given of a mode of use of the top plate having the above-described structure for the work platform A1 which can be extended and contracted. FIGS. 18 and 19 show a work platform A1 in which the top plate can be extended and contracted.
Shows a case where the top plate 81 is extended to almost the maximum length and the support legs 85 and 86 are extended to the maximum length. As described above, in the normal use form, the tread surface 80 having a sufficient length can be secured, and a sufficient height can be secured.

When the top plate 81 is contracted, the work scaffold A1 for expanding and contracting the top plate can take the form shown in FIGS. 20 and 21, and is easily carried into a narrow work site. And can be placed in a stable state. If necessary, the support legs 85 and 86 can be contracted to easily carry them into a narrow work site and place them in a stable state.

Further, in the first embodiment, FIGS.
In the installation mode described with reference to FIG. 17, the top plate according to the present embodiment can be used as a work platform A1 that can be extended and contracted. Further, in the case of storage, the left and right overhang amount adjusting tubes 93 and 94 can be contracted, and the folding connection mechanisms 82 and 83 can be operated to make an extremely compact structure.

As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and is described in the claims. The present invention also includes other embodiments and modifications that can be considered within the scope of the matters.

[0052]

According to the scaffold of the present invention, the upper ends of the pair of support legs are closely attached to both ends of the top plate by the folding connection mechanism. The upper leg has a structure that can be fixed and pivotally connected to the fully closed position and the fully opened position standing from the back of the top plate, and the top plate has a structure that can expand and contract in the axial direction, and the support legs can also expand and contract in the axial direction. Having. Accordingly, by expanding or contracting one or both of the top plate and the support legs, and bending or unfolding the support legs with respect to the top plate, the installation surface is convex or concave regardless of whether the installation place is wide or narrow. , Even on an inclined surface, it can be easily and stably installed, and
It can be stored in a compact form. In the working scaffold according to claim 2, the support leg is configured such that the supporting leg swingably swings on an outer surface of a pair of pillars extending in the vertical direction at predetermined intervals in the width direction. The auxiliary column is mounted to be extendable and contractable, and an overhang amount adjusting tube for adjusting the amount of overhang is slidable relative to the lower connecting tube. Therefore, even in the case of a working scaffold that can expand and contract the top plate having such an auxiliary column, one or both of the top plate and the auxiliary column can be expanded and contracted, and the overhang amount adjustment pipe can be connected to the lower connecting pipe. And slide the support legs, and bend or unfold the support legs with respect to the top plate, so that it can be easily installed regardless of whether the installation area is wide or narrow, or even if the installation surface is convex, concave, or inclined. In addition, it can be installed in a stable state, and can be stored in a compact form. In the work scaffold according to the third aspect, the top plate can be extended and retracted, and the telescopic top plate according to the sixth aspect, the first and second divided tops each having a flat rectangular hollow cross section. Since the plate is slidably fitted, the top plate can be smoothly expanded and contracted, and the strength of the top plate can be maintained even in the extended state. Various operations can be performed safely on the above. The work platform according to claim 4, wherein the tread-forming portion of the second divided top plate is formed in the groove of the first ridge provided in the tread-formed portion of the first divided top plate. Since the upper surface of the second ridge provided on the upper surface is slidably fitted in the longitudinal direction, the strength of the first and second divided top plates can be increased and the upper and lower divided top plates can be relatively slid. In this case, it is possible to reliably prevent the sideways movement. In the work scaffolding for extending the top plate according to claim 5 and the extendable top plate according to claim 7, a plurality of lengths forming the comb-shaped first and second divided top plates. The long rods are meshed with each other in the axial direction to form a top plate, and a long auxiliary rod and a hollow rod for inserting the auxiliary rod are connected to each other on both outer sides thereof in a point-symmetric relationship, whereby the top plate is formed. Both outer surfaces of the plate are flush with each other. Therefore,
Since the top plate has the same width over the entire length in both the extended state and the contracted state, the operator can safely perform various operations on the work platform.

[Brief description of the drawings]

FIG. 1 is a perspective view of a work scaffold according to a first embodiment of the present invention, which is capable of expanding and contracting a top plate.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is a cross-sectional view of the top plate.

FIG. 6 is a front view of a top plate fixing mechanism.

FIG. 7 is a plan sectional view of a top plate fixing mechanism.

FIG. 8 is a front view of the folding connection mechanism.

FIG. 9 is a cross-sectional plan view of the folding connection mechanism.

FIG. 10 is a front sectional view of the leg fixing mechanism.

FIG. 11 is a plan view showing a state in which the top plate according to the first embodiment of the present invention is stored in a work platform that can be extended and retracted.

FIG. 12 is a front view showing a state in which the top plate according to the first embodiment of the present invention is stored in a work platform that can be extended and retracted.

FIG. 13 is an explanatory diagram showing a use form of the work scaffolding base according to the first embodiment of the present invention, which is capable of expanding and contracting the top plate.

FIG. 14 is an explanatory diagram showing a use form of a work scaffolding base capable of expanding and contracting a top plate according to the first embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a use mode of the work scaffolding base according to the first embodiment of the present invention, which is capable of expanding and contracting the top plate.

FIG. 16 is an explanatory diagram showing a use form of a work scaffolding base capable of expanding and contracting a top plate according to the first embodiment of the present invention.

FIG. 17 is an explanatory view showing a use form of a work scaffolding base capable of expanding and contracting a top plate according to the first embodiment of the present invention.

FIG. 18 is a front view of the work scaffold according to the second embodiment of the present invention, which is capable of extending and retracting a top plate, when the work platform is extended.

FIG. 19 is a plan view of the same.

FIG. 20 is a front view of the work scaffold according to the second embodiment of the present invention, which is retractable and retractable.

FIG. 21 is a plan view of the same.

FIG. 22 is a side view of the same.

FIG. 23 is a sectional view taken along line II of FIG. 19;

FIG. 24 is an enlarged explanatory view of a main part of a work scaffold according to a second embodiment of the present invention, which is capable of expanding and contracting a top plate.

FIG. 25 is an explanatory diagram of a work using a conventional stepladder.

FIG. 26 is an explanatory diagram of a work using a conventional stepladder.

FIG. 27 is an explanatory diagram of a work using a conventional frame.

[Explanation of symbols]

A Work scaffolding table with extendable top plate A1 Work scaffolding table with retractable top plate G1 Parallel gap G2 Parallel gap 10 Tread surface 11 Top plate 12 Folding coupling mechanism 13 Folding coupling mechanism 14 Floor 15 Support legs 16 Support leg 17 First split top plate 17a One end 17b Mounting bracket 18 Second split top plate 19 Top plate fixing mechanism 20 Prop 21 Prop 22 Prop 23 Prop 24 Stepping beam 25 Stepping beam 26 Fixed leg 27 Telescopic leg 28 Leg fixing Mechanism 29 Tread forming portion 29a First ridge 30 Channel portion 30a Synthetic resin plate 30b Third ridge 31 Channel portion 31a Synthetic resin plate 31b Third ridge 32 I-type support beam 32a Synthetic resin plate 32b Third Projection 32c Third projection 33 Tread forming portion 33a Second projection 34 Channel 34a Fourth projection 35 Channel 35a Fourth projection 6 Fitting end 37 One side wall 38 Pin holding case 39 Inner wall 40 Outer wall 41 First through hole 42 Second through hole 43 Third through hole 44 Lock pin 45 Fourth through hole 46 Grip piece 47 Flat part 48 Bend Part 49 operation plate 50 reduced diameter portion 51 long hole 52 leaf spring 53 fixed plate 54 fixed plate 55 movable plate 56 movable plate 57 pivot 58 pivot 59 through hole 60 through hole 61 first through hole 62 spring 63 lock pin 64 through hole 65 Inner wall 66 Rack 67 Rack shoe 68 Spring 69 Disengagement means 70 Personal computer 71 Table group 72 Bathroom 72a Bathtub 72b High floor surface 73 Stairs 74 Stairs 75 Stairs 77 Stairs 78 Ceiling 80 Treads 81 Top plate 82 Folding connection mechanism 83 Folding connection Mechanism 84 Floor 85 Support leg 86 Support leg 87 Left support 88 Right support 89 Stepping bar 9 0 Lower connecting pipe 91 Left auxiliary strut 92 Right auxiliary strut 93 Left overhang amount adjustment pipe 94 Right overhang amount adjustment pipe 95 Swinging leg 96 Telescopic leg 97 Fixing device 98 Fixing device 99 First split top plate 100 Second split ceiling Plate 101 Long rod 102 Long rod 103 Spacing member 104 Spacing member 105 Long auxiliary rod 106 Long auxiliary rod 107 Hollow rod for inserting auxiliary rod 108 Hollow rod for inserting auxiliary rod 109 Binding band 110 Binding band 111 Rivet 112 Positioning pin 113 Positioning hole 114 Positioning hole 115 Receipt 116 Pivot pin 117 Top plate fixing mechanism

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[Procedure amendment]

[Submission date] February 15, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Work platform and telescopic top plate for which the top plate is telescopic

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work platform and a telescopic top plate which can be used to perform various operations on a top plate.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG. 25, when remodeling a ceiling in an office, stepladders 122 and 123 are installed on both sides of a desk group 121 on which a personal computer 120 is installed. , 123, a top plate 124 is erected over the desk group 121, and
Working on 24. On the other hand, as shown in FIG. 26, in the remodeling work of a bathroom or a toilet in a general household, first, a top plate 126a is laid on the entire surface of the bathtub 125, and then a stepladder 126 (in addition, a chair or a ladder may be used). ) Is placed, and the remodeling work is performed on the stepladder 126.

[0003] In the work of painting a ceiling surface such as a staircase, as shown in FIG. 27, a frame 133 is constructed by connecting a plurality of single pipes 128 to 131 to a stair 127 using a free clamp 132. , The top plate 13 on the top of the frame 133
4 and the painting work can be performed on the top plate 134.

[0004]

However, when the scaffold is constructed using the stepladders 122, 123, 126 and the frame 133 described above, the installation place is narrow, so that there is a remarkable restriction, and in some cases, the scaffold cannot be constructed. There is a risk. Further, even if a scaffold can be constructed, there is a problem in terms of safety because the work must be performed in a cramped or unstable posture. Further, as shown in FIG. 27, it is necessary to use a variety of jigs to connect the plurality of single pipes 128 to 131 using the free clamp 132 and to construct the frame 133. And the installation time becomes longer.

[0005] The present invention has been made in view of such circumstances, and regardless of the installation location is wide and narrow,
Even if the installation surface is convex, concave, or inclined, it can be easily and stably installed, and can be stored in a compact form. The purpose is to provide a top plate.

[0006]

According to the present invention, there is provided a semiconductor device comprising:
The working scaffolding platform capable of expanding and contracting the top plate described above has upper ends of a pair of support legs at both ends of the top plate having a flat tread surface on an upper surface,
Each of the folding connection mechanisms is pivotally connected to the support leg in a fully closed position where the support leg is in close contact with the back surface of the top plate and a fully open position where the support leg stands from the back surface of the top plate, and the top plate is connected to the axis line. In a working scaffold that has a structure that can be expanded and contracted in the direction and the support leg also has a structure that can be expanded and contracted in the axial direction, the support legs are vertically spaced at predetermined intervals in the width direction. A pair of struts extending in the direction, a plurality of tethers that are horizontally suspended at intervals in the vertical direction between the struts, a lower connecting pipe connecting lower ends of the struts, and an upper end on an outer surface of the struts. An auxiliary support that is pivotally supported and has a lower end extending below the lower end surface of the support and groundable on a floor or the like, and is interposed between the auxiliary support and the lower connecting pipe; The overhang amount control that regulates the overhang amount of the auxiliary support in the width direction Is composed of a tube, the auxiliary struts,
It has a telescopic tube structure composed of a oscillating leg slidably supported on the outer surface of the column and an telescopic leg slidably fitted into the oscillating leg.

According to a second aspect of the present invention, there is provided a work platform for telescopic work, wherein upper ends of a pair of support legs are respectively provided on both ends of a top plate having a flat tread surface by a folding connection mechanism.
The support leg is fixedly pivotally connected to a fully closed position where the support leg is in close contact with the back surface of the top plate and a fully open position where the support leg stands upright from the back surface of the top plate, and has a structure in which the top plate can expand and contract in the axial direction. In addition, in the working scaffolding base having a structure in which the support legs also have a structure capable of extending and contracting in the axial direction, the top plate has a first divided top plate having a flat rectangular hollow cross section,
A second divided top plate having a flat rectangular hollow cross section which is slidably fitted into the first divided top plate, and a ceiling capable of fixing the first and second divided top plates at a predetermined sliding position. A plate fixing mechanism, wherein the flat tread surface is formed by upper surfaces of the first and second divided top plates.

According to a third aspect of the present invention, there is provided a work scaffold for extending a top plate, wherein the first and second divided tops are formed with treads. A first groove extending in the longitudinal direction, the upper surface protruding upward and a concave groove being formed in the lower surface of each of the portions that match in the vertical direction of the portion.
And a second ridge, the upper surface of which the second ridge projects is slidably fitted in the concave groove of the first ridge in the longitudinal direction.

According to a fourth aspect of the present invention, there is provided a work platform capable of extending and retracting a top plate, wherein upper ends of a pair of support legs are respectively provided on both ends of the top plate having a flat tread surface by a folding connection mechanism.
The support leg is fixedly pivotally connected to a fully closed position where the support leg is in close contact with the back surface of the top plate and a fully open position where the support leg stands upright from the back surface of the top plate, and has a structure in which the top plate can expand and contract in the axial direction. A work scaffold that has a structure in which the support legs also have a structure in which the support legs can also expand and contract in the axial direction. In the work scaffolding base, the plurality of long rods are arranged in parallel with a parallel gap in the width direction. Are fixedly connected to each other by a spacing member to form first and second comb-shaped divided top plates, and the tip of the long rod of one divided top plate is connected to the length of the other divided top plate. A long auxiliary rod and a hollow rod for inserting the auxiliary rod are inserted into the gaps between the long rods so as to be slidable in the axial direction, and point-symmetrically disposed on both outer sides of the first and second divided top plates. And the long auxiliary rod of one of the divided top plates supports the other divided top plate. The outer surface of the long auxiliary rod of the one of the divided top plates is the outer surface of the auxiliary rod insertion hollow rod of the other divided top plate. It is designed to be flush with no steps.

According to a fifth aspect of the present invention, there is provided a work scaffolding base capable of extending and retracting the top plate, wherein the support legs are spaced apart from each other by a predetermined distance in the width direction. A pair of struts extending vertically in a vertical direction, a plurality of treads extending horizontally between the struts with an interval in the vertical direction, a lower connecting pipe connecting lower ends of the struts, and an upper end outside the struts. An auxiliary column pivotally supported on the side surface and having a lower end extending below the lower end surface of the column and groundable on a floor or the like, and an auxiliary column interposed between the auxiliary column and the lower connecting pipe. A projecting amount adjusting tube for regulating the projecting amount of the auxiliary column in the width direction, the auxiliary column being pivotally supported on the outer surface of the column, and a swing leg. And a telescopic leg structure slidably fitted therein.

According to a sixth aspect of the present invention, the telescopic top plate has a first divided top plate having a flat rectangular hollow cross section, and a flat rectangular hollow cross section slidably fitted into the first divided top plate. A second divided top plate, and a top plate fixing mechanism capable of fixing the first and second divided top plates at a predetermined sliding position, wherein an upper surface of the first and second divided top plates A flat tread is formed, and upper and lower portions of the first and second split top plates are vertically aligned with each other in a vertically aligned portion of the tread forming portion, and a concave groove is formed in the lower surface in the longitudinal direction. First and second protruding ridges are provided, and the upper surface of the second ridge is slidably fitted in the groove of the first ridge. In the telescopic top plate according to the seventh aspect, the base ends of a plurality of long rods arranged in parallel with a parallel gap in the width direction are fixed and connected by a spacing member to form a comb-shaped first plate.
And a second divided top plate, and the tip of the long rod of one divided top plate is slidably inserted in the axial direction into the gap between the long rods of the other divided top plate, and A long auxiliary rod and a hollow rod for inserting an auxiliary rod are connected to each other on both outer sides of the first and second divided top plates in a point-symmetric relationship, and the long auxiliary rod of one divided top plate is connected to the other divided portion. It is constituted by slidably inserting into the auxiliary rod insertion hollow rod of the top plate, and the outer surface of the long auxiliary rod of the one divided top plate is further inserted into the auxiliary rod insertion hollow rod of the other divided top plate. It is designed to be flush with the outside surface of the.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. (First Embodiment) First, with reference to FIGS. 1 to 4, an overall configuration of a work scaffolding base A according to a first embodiment of the present invention, which is capable of expanding and contracting a top plate, will be described.

As shown in the figure, a working scaffold A capable of extending and retracting a top plate is substantially a top plate 11 composed of a horizontally long rectangular plate having a tread surface 10 on an upper surface, and upper and lower ends of the top plate 11 are respectively left and right. It is provided with a pair of support legs 15 and 16, which are foldably connected to the ends via fold connection mechanisms 12 and 13 and whose lower end is placed on a floor surface 14.

The top plate 11 has a structure in which two second divided top plates 18 are slidably fitted into one first divided top plate 17 and can be expanded and contracted in the horizontal direction (axial direction). Have. The rear portions of the second divided top plates 18 are integrally connected by rear connecting ribs. Further, the top plate 11 is fixed at an arbitrary telescopic position by the top plate fixing mechanism 19,
The length of the top plate 11 can be adjusted. On the other hand, each of the support legs 15 and 16 has a ladder structure, and has a structure that can expand and contract in a vertical direction (axial direction) in principle. That is, each of the support legs 15 and 16 includes a pair of columns 20, 21, 22, and 23 extending in the vertical direction at predetermined intervals in the front-rear direction, as viewed from the side shown in FIGS. , 21, 22, and 23 are formed from a plurality of treads 24, 25 which are suspended horizontally in the vertical direction.

Each of the columns 20 to 23 is
An upper end is composed of a fixed leg 26 foldably connected by the foldable connection mechanisms 12 and 13 described above, and a telescopic leg 27 slidably fitted into the fixed leg 26. Also,
The leg fixing mechanism 28 fixes the telescopic leg 27 to the fixed leg 26 at an arbitrary telescopic position.
23 can be adjusted in height.

Next, the structure of each part of the work scaffold A, which is capable of expanding and contracting the top plate having the above-described overall structure, will be described in detail. First, the configuration of the top plate 11 will be described. In FIG. 1, the first divided top plate 17 forming the left half of the top plate 11 has a flat rectangular hollow cross section as shown in FIG.
A tread forming portion 29 made of a flat and vertically long rectangular plate having a width equal to the width of the top plate 11, channel portions 30 and 31 continuously provided on left and right side edges of the tread forming portion 29, and a tread forming portion 2
9 and an I-shaped support beam 32 continuously provided on the back surface at the center. Then, the channel portion 30 and the I-shaped support beam 3
2 and between the channel portion 31 and the I-shaped support beam 32, a divided top plate storage space is formed.

On the other hand, the two second divided top plates 18 forming the right half of the top plate 11 in FIG. 1 each have a flat rectangular hollow cross section as shown in FIG. The tread surface forming portion 33 is formed of a flat and vertically long rectangular plate having a width of about half the width, and the channel portions 34 and 35 are provided continuously on the left and right side edges of the tread forming portion 33. Each of these second divided top plates 18 is slidably stored in a divided top plate storage space provided in the first divided top plate 17. Note that synthetic resin plates 30a, 31a, 32a are attached to the inner surfaces of the channel portions 30, 31, and the I-shaped support beam 32 in order to smoothly slide the second divided top plate 18. Further, as clearly shown in FIG. 5, in the present embodiment, the upper surfaces of the first and second divided top plates 17, 18 which are vertically aligned with the tread forming portions 29, 33 are respectively upward. A plurality of first and second ridges 29a, 33a having a trapezoidal section extending in the longitudinal direction and having a concave groove formed on the lower surface and extending in the longitudinal direction are provided. The protruding upper surface of the second ridge 33a is slidably fitted in the longitudinal direction in the concave groove of the first ridge 29a. The strength is increased, and side-shifting when sliding relatively is prevented. In addition,
The widths of the first and second ridges 29a, 33a are respectively
Although the distance between the first protrusions 29a and the distance between the second protrusions 33a is smaller, they may be the same or wider. Further, as shown in FIG. 5, the first and second divided top plates 1
7, 18 channel sections 30, 31, 34, 35 and I
A plurality of third and fourth ridges 30b, 31b, 32b, 3b, 3b having a trapezoidal cross-section extending in the longitudinal direction with an upper surface protruding upward and a concave groove formed in the lower surface are also formed on the support beam 32, respectively.
2c, 34a and 35a are provided. And the fourth
The third ridges 30b, 3b are provided in the concave grooves of the ridges 34a, 35a.
The protruding upper surfaces of 1b, 32b, 32c are slidably fitted in the longitudinal direction, and the first and second divided top plates 17,
In this case, the lateral displacement when the members 18 are relatively slid can be more effectively prevented.

Next, the structure of a top plate fixing mechanism 19 that can fix the top plate 11 composed of the first divided top plate 17 and the second divided top plate 18 at an arbitrary expansion / contraction position will be described with reference to FIGS. 3, and will be described with reference to FIGS. As shown in FIGS. 1 to 3, the top plate fixing mechanism 19 is mounted on one side wall 37 located near an insertion end portion 36 into which the first divided top plate 17 fits the second divided top plate 18. Have been.

As shown in FIGS. 6 and 7, along a side wall 37 of the fitting end 36 of the first divided top plate 17, a pin holding case 38 having a hollow rectangular cross section with both longitudinal ends opened. The inner wall 39 is fixed to one side wall 37 of the first divided top plate 17. In the center portions of the outer walls 39 and 40 of the pin holding case 38, the first divided top plate 17 has first
And second through holes 41 and 42 are formed. further,
A third through-hole 43 is formed at a position where the first side plate 37 is aligned with the first and second through-holes 41 and 42 on one side surface 37. A lock pin 44 is provided in the pin holding case 38 so as to be able to advance and retreat in a state of penetrating these through holes 41 to 43.

A plurality of fourth through holes 45 are provided on the side wall of the second divided top plate 18 corresponding to one side wall 37 of the first divided top plate 17 at intervals in the longitudinal direction. I have. Then, the second divided top plate 18 is expanded and contracted with respect to the first divided top plate 17, and any of the fourth through holes 45 is selectively inserted into the first to third transparent holes. After being aligned with the holes 41 to 43, the lock pin 44 is advanced toward the fourth through hole 45 and inserted therethrough so that the second split top plate 17 is inserted into the second divided top plate 17.
Can be fixed. On the other hand, by retracting the lock pin 44 from the fourth through hole 45,
The fixing of the first divided top plate 17 and the second divided top plate 18 can be released.

Various mechanisms are conceivable as a mechanism for moving the lock pin 44 forward and backward. In this embodiment, the structure is as shown in FIGS. 6 and 7. That is, an operation plate 49 having a gripping piece 46 at one end and a flat portion 47 and a bent portion 48 at the other end is formed, and the flat portion 47 and the bent portion 48 of the operation plate 49 can be freely moved into and out of the pin holding case 38. It is arranged in. Lock pin 4 on flat portion 47 and bent portion 48
An elongated hole 51 is provided to slidably fit the reduced diameter portion 50 provided in the middle of 4 in the longitudinal direction. Also, the pin holding case 3
Inside 8, a leaf spring 52 for constantly urging the lock pin 44 in the advance direction is provided.

Next, with reference to FIGS. 2, 8 and 9, the structure of the folding connection mechanisms 12, 13 will be described. As shown in the drawing, they have the same configuration except that they are arranged symmetrically in a front view,
The movable plates 55, 56 fixed to the upper ends of the support legs 15, 16 are fixed to the fixed plates 53, 54 fixed to both ends of the movable legs 55, 56.
Are rotatably connected by pivots 57 and 58.

The specific configuration of the folding connection mechanism 12 is as follows.
A specific description will be given with reference to FIGS. Note that the fold connection mechanism 13 has the same configuration as the fold connection mechanism 12, and a description thereof will be omitted.

As shown in FIGS. 8 and 9, the movable plate 55
Is partially supported by the fixed plate 53 by a pivot 57 while a part thereof is always superimposed on the fixed plate 53. And
As shown by the solid line, the channel portion 3 of the first divided top plate 17 is located at the fully opened position where the support leg 15 makes a predetermined angle (for example, 70 ° to 120 °) with the back surface of the top plate 11.
The through-holes 59 and 60 provided in alignment with the end of the movable plate 55 and the fixed plate 53 are aligned with the first through-hole 61 provided at a position separated from the pivot 57 of the movable plate 55. And
In this fully opened position, the lock pin 63 attached to the one end 17a of the first divided top plate 17 in a state of being urged by the spring 62 in the advance direction is inserted into the through holes 59, 6.
0, 61, the movable plate 55 can be fixed to the fixed plate 53, and the support legs 15
1 can be fixed to one end to maintain the open leg state. Reference numeral 17b denotes an attachment for attaching the lock pin 63 to the one end 17a.

As shown by the imaginary lines, the support legs 15,
In the fully closed position where 16 is in close contact with the back surface of the top plate 11,
The through holes 59, 60 provided in alignment with the end of the channel portion 30 of the first divided top plate 17 and the fixed plate 53 are located at positions separated from the pivot 57 of the movable plate 55 and the first through hole 61. Can be aligned with the second through hole 64 provided in the first through hole. In this fully closed position, the lock pin 63
Through the through holes 59, 60, 64, the movable plate 55 can be fixed to the fixed plate 53, and the support leg 15 can be fixed to one end of the top plate 11 to maintain the closed leg state. . 11 and 12 show the support leg 1.
5 and 16 show a state in which the legs are completely closed with respect to the top plate 11.

Next, with reference to FIG. 10, the structure of the leg fixing mechanism 28 that can fix the telescopic leg 27 to the fixed leg 26 at an arbitrary telescopic position will be described. As shown in the figure, the leg fixing mechanism 28 substantially includes a rack 6 formed on the surface of the inner wall 65 of the telescopic leg 27 having a hollow rectangular cross section.
6, a rack shoe 67 attached between the lower end of the channel-shaped (lip groove-shaped) fixed leg 26 and the lowermost step rail 24, and the rack shoe 67 is elastically urged toward the rack 66. It comprises a spring 68 which is an example of an elastic means to be engaged, and an engagement releasing means 69 for releasing the engagement between the rack 66 and the rack shoe 67 described above. Preferably, a through hole is provided in a rack groove formed between rack teeth constituting the rack 66.

With this configuration, by operating the engagement releasing means 69 to release the engagement between the rack 66 and the rack shoe 67, the telescopic leg 27 can be slid with respect to the fixed leg 26. When the operation of the disengagement means 69 is stopped at the position, the rack 66 and the rack shoe 67 are again engaged by the urging force of the spring 68, so that the telescopic leg 27 is fixed at the predetermined sliding position.
Can be fixed.

Next, various modes in which the work scaffold A capable of expanding and contracting the top plate having the above-described structure and various works that can be performed by the work scaffold A will be described with reference to FIG. This will be described with reference to FIGS.

First, with reference to FIGS. 1 to 4, a description will be given of a basic mode in which a work platform A capable of expanding and contracting a top plate can be used. 1 to 4 show a case where the work scaffold A capable of extending and retracting the top plate extends the top plate 11 to almost the maximum length and extends the support legs 15 and 16 to the maximum length. As described above, in the normal use form, the tread surface 10 having a sufficient length can be secured, and a sufficient height can be secured. In addition, about the height,
In this embodiment, the step bar 24 has two steps.
By setting the number of steps or more, not only the basic height (height at the time of expansion and contraction) but also the maximum height (height at the time of maximum elongation) can be easily increased.

Further, when the top board 11 is contracted, the work scaffolding A for extending and retracting the top board can take a form shown by a virtual line, and can be easily carried into a narrow work site. ,
Can be placed in a stable state. If necessary, support leg 1
By shrinking 5 and 16, furthermore, it can be easily carried into a narrow work site and can be placed in a stable state. Further, in the case of storage, as described above, the folding connection mechanisms 12 and 13 can be operated to make the extremely compact structure shown in FIGS. 11 and 12.

Next, with reference to FIGS. 13 to 17, other forms in which the work platform A capable of expanding and contracting the top plate and various types of work that can be performed by the work platform A will be described. The operation will be described.

FIG. 13 shows a case where the ceiling is remodeled in the office. The ceiling plate 11 is extended to almost the maximum length, and the support legs 15, 16 are extended to the maximum length. The work scaffolding table A, which is capable of expanding and contracting a plate, can be easily and stably placed across the desk group 71 on which the personal computer 70 is installed.

FIG. 14 shows a case where a bathroom 72 is remodeled in an ordinary household. The top plate 11 is reduced in accordance with the size of the bathroom 72, and the support legs 15, 16 are also reduced in accordance with the height of the bathroom 72. This makes it possible to easily and stably set the work scaffold A capable of expanding and contracting the top plate in the bathroom 72.
Can be installed on the high floor surface 72b around the bathtub 72a.

FIG. 15 shows a case where the ceiling on the stairs 73 and 74 is painted. When the stairs 73 have a steep slope,
As shown by the solid line, while the top plate 11 is in a contracted state, one support leg 15 is extended to the maximum, and the other support leg 1 is extended.
By operating the folding connection mechanism 13 so that the folding work 6 is completely bent inward, the work platform A capable of expanding and contracting the top plate can be installed on the stairs 73 in a stable state. A horizontal tread 10 can be formed on the plate 11.

On the other hand, when the gradient of the stairs 74 is gentle,
As shown by the imaginary line, the top plate 11 was extended, the one support leg 15 was extended to the maximum, and the other support leg 16 was completely folded inward by operating the folding connection mechanism 13. By setting it in the state, the work platform A capable of expanding and contracting the top plate can be installed on the stairs 74 in a stable state, and the horizontal tread surface 10 having a sufficient length can be formed on the top plate 11. it can.

FIG. 16 shows a case in which a work scaffold A capable of expanding and contracting a top plate is used for various works on the stairs 75. While extending the top plate 11 to the maximum length and contracting the support legs 15,
With the support leg 16 on the opposite side extended to the maximum length, the stairs 7
Set at 5. At this time, when the top 11 is inclined as shown by a virtual line, the length of the top 11 is reduced,
The tread 10 can be easily set horizontally.

FIG. 17 also shows a case in which a work scaffolding table A with a top plate that can be extended and contracted is used for various constructions on the stairs 77. In this case, if the ceiling 78 has a gentle gradient,
By adjusting the length of the top plate 11 so that the gradient of the top plate 11 is equal to the gradient of the ceiling 78, the space between the ceiling 78 and the top plate 11 can be kept constant. Therefore, the worker can work in the same posture. As described above, the work scaffold A capable of expanding and contracting the top plate according to the present embodiment can be easily and easily used regardless of whether the installation place is wide or narrow or the installation surface is a convex surface, a concave surface, or an inclined surface. It can be installed in a stable state and can be stored in a compact form.

(Second Embodiment) Next, FIGS.
With reference to FIG. 4, a description will be given of the overall configuration of a work scaffold A1 according to a second embodiment of the present invention, which is capable of expanding and contracting a top plate. As shown in FIG. 18 and FIG. 19, the work scaffold A1 substantially includes a top plate 81 formed of a horizontally long rectangular plate having a tread surface 80 on the upper surface, and a top end thereof is folded at the left and right ends of the top plate 81. A pair of support legs 8, which are foldably connected via tatami connection mechanisms 82, 83 and whose lower ends are placed on the floor surface 84.
5 and 86 are provided.

As shown in FIGS. 18 to 21, the support leg 85 (same for the support leg 86) extends in a substantially vertical direction at a predetermined interval in the width direction, and has a top plate 81 at the upper end. And a pair of left and right columns 87 and 88 connected to the ends of the pair via folding connection mechanisms 82 and 83, and a plurality of laterally spaced columns vertically spaced between the left and right columns 87 and 88. Stepping bar 89
And a lower connecting pipe 90 for connecting the lower ends of the left and right columns 87 and 88 to each other, and an upper end pivotally supported by the outer surfaces of the left and right columns 87 and 88 and a lower end to the left and right columns 87. , 88
Left extending from the lower end face of
The right and left auxiliary columns 91 and 92 are interposed between the left and right auxiliary columns 91 and 92 and the lower connecting pipe 90, and the left and right auxiliary columns 9 are provided.
There are left and right overhang amount adjusting tubes 93 and 94 for regulating the overhang amounts in the width direction of 1, 92.

As shown in FIGS. 22 and 24, the left and right auxiliary columns 91 and 92 have telescopic tube structures in which telescopic legs 96 are slidably inserted into swinging legs 95, respectively. And a fixing device 97 that can fix the telescopic leg 96 at an arbitrary telescopic position. Further, as shown in FIGS. 22 and 24, a telescopic tube structure is formed by nestably inserting left and right overhanging amount adjusting tubes 93 and 94 into both ends of the lower connecting tube 90. In addition, a fixing device 98 that can fix the left and right overhanging amount adjusting tubes 93 and 94 at arbitrary expansion and contraction positions is provided.

Also, in the present embodiment, similarly to the first embodiment, the top plate 81 has a structure which is composed of the first and second divided top plates 99 and 100 and can be extended and contracted in the axial direction. doing. That is, as shown in FIG. 19 and FIG.
The second divided top plates 99 and 100 respectively hold the base ends of a plurality of long rods 101 and 102 formed of hollow rectangular tubes arranged in parallel with parallel gaps G1 and G2 in the width direction, with a spacing member 103, 104 are formed in a comb-like shape by being fixedly connected using rivets or the like. The ends of the long rods 101 (102) of the divided top plate (the first divided top plate 99 or the second divided top plate 100) are respectively connected to the other divided top plate (the second divided top plate 100). Or the first divided top plate 9
9) Gap G2 (G) between long rods 102 (101)
1) is slidably inserted in the axial direction. With this configuration, the first and second divided top plates 99 and 100 can expand and contract with each other, and the length of the top plate 81 can be adjusted.

Further, in this embodiment, as shown in FIGS. 19 and 21, the first and second divided top plates 99, 10
0, the long auxiliary rods 105 and 106 and the hollow rod 107 for inserting the auxiliary rod in a point symmetry
108, one of the divided top plates 99 (10
0) The long auxiliary rod 105 (106) is the hollow rod 108 for inserting the auxiliary rod of the other divided top plate 100 (99).
It is slidably inserted in (107). The long auxiliary rod 105 (10) of one of the divided top plates 99 (100)
The outer surface of 6) is made flush with the outer surface of the auxiliary rod insertion hollow rod 108 (107) of the other divided top plate 100 (99) without any step. Therefore, FIG.
As shown in FIG. 9 and FIG. 21, the top plate 81 has the same width over the entire length in both the extended state and the contracted state, so that safety of work can be ensured.

In the present embodiment, as shown in FIGS. 19, 21 and 23, the long rods 101, 10
2 is formed by binding bands 109 and 110 having a U-shaped cross section, which are disposed in a state of being sandwiched from above and below the same.
It is bound using rivets 111. By using the binding bands 109 and 110, it is possible to prevent the variation of the long rods 101 and 102 and to guide the relative sliding of the long rods 101 and 102. The plates 99 and 100 can smoothly slide relative to each other. In addition, this binding band 109,
110, the first and second divided top plates 99, 100
Can be prevented from being separated, and the connection strength of a certain level or more can be ensured, and the safety of the worker working on the top plate 81 can be ensured.

Explaining another structure in the above embodiment, the fixing device 97 shown in FIG. 24 has the same structure as the fixing device 28 in the first embodiment. That is, a rack groove is provided on the outer surface of the telescopic leg 96, and a rack tooth provided in the fixing device 97 and urged in the engaging direction by a spring is detachably engaged with the rack groove. . Therefore, the height from the floor surface 84 to the top plate 81 can be adjusted by engaging the rack teeth with the rack grooves by the fixing device 97 after extending the extendable leg 96 by an arbitrary length.

The fixing device 28 shown in FIG. 1 also has the same configuration as the fixing device disclosed by the present applicant in Japanese Patent Application Laid-Open No. 9-177460. That is, in FIG. 24, the left overhang amount adjusting tube 93 (the right overhang amount adjusting tube 94)
The same is true. A leaf spring is bent and stored in a U-shape on the inner side of the end of the bracket, and a convex portion is formed at one end of the leaf spring. And a positioning pin 112 is attached to the other end of the leaf spring so that a positioning hole 113 provided on the side wall of the lower connecting tube 90 and through holes provided in the left and right overhanging amount adjusting tubes 93 and 94 can be inserted. I have. The lower connecting pipe 90 is provided with a plurality of positioning holes 113 and 114.

With this configuration, the positioning pin 112
Is pushed into the inside of the lower connecting tube 90 to release the fitting state of the positioning pin 112, the positioning hole 113 and the through hole, so that the left overhanging amount adjusting tube 93 can be slid. It has become. Also, left,
When the positioning pin 112 comes to the position of the positioning holes 113 and 114 by sliding the right overhang amount adjusting tubes 93 and 94,
The positioning pin 112 and the positioning hole 113 (114) again
And the through holes are fitted to each other, so that the left and right overhanging amount adjusting tubes 93 and 94 are not allowed to slide from the lower connecting tube 90, and the left and right overhanging amount adjusting tubes 93 and 94 are overhanged to the left and right outside. Can be adjusted. Note that FIG.
In the embodiment shown in FIG. 4, the positioning holes 113 and 114 are provided at two places on the left and right, so that the left and right overhang amount adjusting tubes 9 are provided.
The overhang amounts of 3, 94 can be regulated in two stages.

In FIG. 24, a receiving tube 115 made of a short cylinder is attached to the end of each of the left and right overhang amount adjusting tubes 93 and 94 by a pivot pin 116 so as to be swingable. The swinging leg 95 is slidably held by the receiving member 115. Therefore, even if the left and right overhanging amount adjusting tubes 93 and 94 expand and contract, the receiving member 115 can move the left and right overhanging amount adjusting tubes 93 and 94.
Since it swings with respect to the 94 and slides with respect to the swing leg 95, the left and right overhanging amount adjusting tubes 93 and 94 can be kept in a horizontal state. Further, as shown in FIGS. 18 to 21, the first and second split top plates 99 and 100 are fixed at arbitrary expansion and contraction positions, and are the same as the top plate fixing mechanism 19 used in the first embodiment. Top plate fixing mechanism 117 having the following configuration:
Are attached to the top plate 81.

Next, a description will be given of a mode of use of the work scaffold A1 which is capable of expanding and contracting the top plate having the above configuration. FIGS. 18 and 19 show a work platform A1 in which the top plate can be extended and contracted.
Shows a case where the top plate 81 is extended to almost the maximum length and the support legs 85 and 86 are extended to the maximum length. As described above, in the normal use form, the tread surface 80 having a sufficient length can be secured, and a sufficient height can be secured.

When the top plate 81 is contracted, the work scaffold A1 for expanding and contracting the top plate can take the form shown in FIGS. 20 and 21, and is easily carried into a narrow work site. And can be placed in a stable state. If necessary, the support legs 85 and 86 can be contracted to easily carry them into a narrow work site and place them in a stable state.

Further, in the first embodiment, FIGS.
In the installation mode described with reference to FIG. 17, the top plate according to the present embodiment can be used as a work platform A1 that can be extended and contracted. Further, in the case of storage, the left and right overhang amount adjusting tubes 93 and 94 can be contracted, and the folding connection mechanisms 82 and 83 can be operated to make an extremely compact structure.

As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and is described in the claims. The present invention also includes other embodiments and modifications that can be considered within the scope of the matters.

[0052]

According to the scaffold of the present invention, the upper ends of the pair of support legs are closely attached to both ends of the top plate by the folding connection mechanism. A structure in which the top leg has a structure that can be extended and retracted in the axial direction, and the support leg is also extendable and contractable in the axial direction. Having. Accordingly, by expanding or contracting one or both of the top plate and the support legs, and bending or unfolding the support legs with respect to the top plate, the installation surface is convex or concave regardless of whether the installation place is wide or narrow. , Even on an inclined surface, it can be easily and stably installed, and
It can be stored in a compact form. In particular, in the work scaffolding base capable of expanding and contracting the top plate according to claim 1,
The supporting leg is provided with an auxiliary column swingably attached to the outer surfaces of a pair of columns extending in the vertical direction at a predetermined interval in the width direction, and makes the auxiliary column expandable and contractable, and adjusts the amount of protrusion. The overhang amount adjusting tube is slidable relative to the lower connecting tube. Therefore, even if it is a work scaffold that can expand and contract the top plate having such an auxiliary support,
By expanding and contracting one or both of the top plate and the auxiliary support, sliding the overhang amount adjustment tube with respect to the lower connection tube, and bending or unfolding the support legs with respect to the top plate, Regardless of whether the installation surface is wide or narrow, or if the installation surface is a convex surface, a concave surface, or an inclined surface, it can be easily and stably installed, and can be stored in a compact form. In the work scaffold according to claim 2 and the telescopic top plate according to claim 6, the first and second divided ceilings each having a flat rectangular hollow cross section are used as the top plate. Since the plate is slidably fitted, the top plate can be smoothly expanded and contracted, and the strength of the top plate can be maintained even in the extended state. Various operations can be performed safely on the above. 4. The work platform according to claim 3, wherein the tread-forming portion of the second divided top plate is formed in the groove of the first ridge provided in the tread-formed portion of the first divided top plate. Since the upper surface of the second ridge provided on the upper surface is slidably fitted in the longitudinal direction, the strength of the first and second divided top plates can be increased and the upper and lower divided top plates can be relatively slid. In this case, it is possible to reliably prevent the sideways movement. In the work scaffolding base capable of expanding and contracting the top plate according to claim 4 and the telescopic top plate according to claim 7, the first and second comb-shaped top plates are provided.
A plurality of long rods that form a divided top plate are meshed with each other in the axial direction to form a top plate, and a long auxiliary rod and an auxiliary rod are inserted on both outer portions thereof in a point-symmetric relationship. By connecting the hollow rods in a row, both outer surfaces of the top plate are flush with each other without any steps. Therefore, since the top plate has the same width over the entire length in both the extended state and the contracted state, the operator can safely perform various operations on the work platform.

[Brief description of the drawings]

FIG. 1 is a perspective view of a work scaffold according to a first embodiment of the present invention, which is capable of expanding and contracting a top plate.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is a cross-sectional view of the top plate.

FIG. 6 is a front view of a top plate fixing mechanism.

FIG. 7 is a plan sectional view of a top plate fixing mechanism.

FIG. 8 is a front view of the folding connection mechanism.

FIG. 9 is a cross-sectional plan view of the folding connection mechanism.

FIG. 10 is a front sectional view of the leg fixing mechanism.

FIG. 11 is a plan view showing a state in which the top plate according to the first embodiment of the present invention is stored in a work platform that can be extended and retracted.

FIG. 12 is a front view showing a state in which the top plate according to the first embodiment of the present invention is stored in a work platform that can be extended and retracted.

FIG. 13 is an explanatory diagram showing a use form of the work scaffolding base according to the first embodiment of the present invention, which is capable of expanding and contracting the top plate.

FIG. 14 is an explanatory diagram showing a use form of a work scaffolding base capable of expanding and contracting a top plate according to the first embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a use mode of the work scaffolding base according to the first embodiment of the present invention, which is capable of expanding and contracting the top plate.

FIG. 16 is an explanatory diagram showing a use form of a work scaffolding base capable of expanding and contracting a top plate according to the first embodiment of the present invention.

FIG. 17 is an explanatory view showing a use form of a work scaffolding base capable of expanding and contracting a top plate according to the first embodiment of the present invention.

FIG. 18 is a front view of the work scaffold according to the second embodiment of the present invention, which is capable of extending and retracting a top plate, when the work platform is extended.

FIG. 19 is a plan view of the same.

FIG. 20 is a front view of the work scaffold according to the second embodiment of the present invention, which is retractable and retractable.

FIG. 21 is a plan view of the same.

FIG. 22 is a side view of the same.

FIG. 23 is a sectional view taken along line II of FIG. 19;

FIG. 24 is an enlarged explanatory view of a main part of a work scaffold according to a second embodiment of the present invention, which is capable of expanding and contracting a top plate.

FIG. 25 is an explanatory diagram of a work using a conventional stepladder.

FIG. 26 is an explanatory diagram of a work using a conventional stepladder.

FIG. 27 is an explanatory diagram of a work using a conventional frame.

[Explanation of Signs] A: Work platform that allows the top plate to expand and contract, A1: Work platform that allows the top plate to expand and contract, G1: Parallel gap, G2: Parallel gap, 10: Tread surface, 11: Top board, 12: Folding connection mechanism, 1
3: Folding connection mechanism, 14: Floor surface, 15: Support leg, 16:
Support leg, 17: first divided top plate, 17a: one end, 17
b: mounting bracket, 18: second divided top plate, 19: top plate fixing mechanism, 20: support, 21: support, 22: support, 23: support, 24: stepping beam, 25: stepping beam, 26: fixing Legs, 2
7: telescopic leg, 28: leg fixing mechanism, 29: tread forming part, 2
9a: first ridge, 30: channel portion, 30a: synthetic resin plate, 30b: third ridge, 31: channel portion, 3
1a: synthetic resin plate, 31b: third ridge, 32: I-shaped support beam, 32a: synthetic resin plate, 32b: third ridge, 32
c: 3rd ridge, 33: tread formation part, 33a: 2nd ridge, 34: channel part, 34a: 4th ridge, 35:
Channel portion, 35a: fourth ridge, 36: fitting end,
37: one side wall, 38: pin holding case, 39: inner wall, 4
0: outer wall, 41: first through hole, 42: second through hole, 4
3: third through hole, 44: lock pin, 45: fourth through hole, 46: gripping piece, 47: flat portion, 48: bent portion,
49: operation plate, 50: reduced diameter portion, 51: long hole, 52: leaf spring, 53: fixed plate, 54: fixed plate, 55: movable plate, 5
6: movable plate, 57: pivot, 58: pivot, 59: through hole, 6
0: through hole, 61: first through hole, 62: spring, 6
3: Lock pin, 64: Through hole, 65: Inner wall, 66: Rack, 67: Rack shoe, 68: Spring, 69: Disengagement means, 70: Personal computer, 71: Desk group, 72: Bathroom, 72a: Bathtub , 72b: high floor, 7
3: stairs, 74: stairs, 75: stairs, 77: stairs, 7
8: ceiling, 80: tread surface, 81: top plate, 82: folding connection mechanism, 83: folding connection mechanism, 84: floor surface, 85: support leg,
86: Support leg, 87: Left support, 88: Right support, 89: Stepping bar, 90: Lower connecting pipe, 91: Left auxiliary support, 92: Right auxiliary support, 93: Left overhang amount adjustment pipe, 94: Right overhang Volume adjustment tube, 95: swing leg, 96: telescopic leg, 97: fixing device, 98: fixing device, 99: first divided top plate, 10
0: second split top plate, 101: long rod, 102: long rod, 103: spacing member, 104: spacing member, 105: long auxiliary rod, 106: long auxiliary rod, 107: auxiliary Hollow rod for inserting rod, 108: Hollow rod for inserting auxiliary rod, 109: Binding band, 11
0: binding band, 111: rivet, 112: positioning pin, 113: positioning hole, 114: positioning hole, 11
5: receiving money, 116: pivot pin, 117: top plate fixing mechanism

Claims (7)

[Claims] An upper end of a pair of support legs is provided at both ends of a top plate having a flat tread surface on an upper surface with a fully closed leg position in which the support legs are in close contact with the back surface of the top plate by folding connection mechanisms. The top plate has a structure that is pivotally connected to be able to be fixed to a fully opened position standing from the back surface of the top plate, and the top plate has a structure that is extendable in the axial direction, and the support leg also has a structure that is extendable in the axial direction. A scaffold for work, which is capable of expanding and contracting the top plate. 2. The method according to claim 1, wherein the supporting leg includes a pair of columns extending in a vertical direction at a predetermined interval in a width direction, a plurality of treads extending horizontally between the columns at a vertical interval, and A lower connecting pipe for connecting the lower ends of the columns, and an auxiliary which is pivotally supported at the upper end on the outer surface of the columns and has a lower end extending downward from the lower surface of the columns so as to be able to contact the floor or the like. A support, interposed between the auxiliary support and the lower connecting pipe,
A projecting amount adjusting tube for regulating the projecting amount of the auxiliary support in the width direction, the auxiliary support being swingably supported on the outer surface of the support, The work platform according to claim 1, further comprising a telescopic tube structure including a telescopic leg movably fitted therein. 3. The top plate has a first divided top plate having a flat rectangular hollow cross section and a second divided top plate having a flat rectangular hollow cross section slidably fitted into the first divided top plate. A top plate fixing mechanism capable of fixing the first and second divided top plates at a predetermined sliding position, wherein the flat tread surface is formed by an upper surface of the first and second divided top plates. 3. The work scaffold according to claim 1, wherein the work scaffold is formed to be telescopic. 4. A first and second longitudinally extending first and second divisional top plates, each of which has an upper surface protruding upward and a concave groove formed in a lower surface thereof, and extending in a longitudinal direction. 4. A second ridge is provided, and an upper surface of the second ridge is slidably fitted in the groove of the first ridge in a longitudinal direction. A work platform that allows the top plate described above to expand and contract. 5. The comb-shaped first and second comb-shaped top plates are formed by fixedly connecting base ends of a plurality of long rods arranged in parallel with a parallel gap in the width direction by a spacing member. A divided top plate is formed, and the end of the long rod of one divided top plate is slidably inserted in the gap between the long rods of the other divided top plate in the axial direction, and the first and the second are separated. A long auxiliary rod and a hollow rod for inserting an auxiliary rod are connected to each other on both outer sides of the two divided top plates in a point-symmetric relationship, and the long auxiliary rod of one divided top plate assists the other divided top plate. The outer surface of the long auxiliary rod of one of the divided top plates and the outer surface of the auxiliary rod insertion hollow rod of the other divided top plate are configured by being slidably inserted into the rod insertion hollow rod. 3. The device according to claim 1, wherein the surface is in a flat state without a step. A work platform that allows the top plate to be stretched. 6. A first divided top plate having a flat rectangular hollow cross section, a second divided top plate having a flat rectangular hollow cross section slidably fitted into the first divided top plate, and A top plate fixing mechanism capable of fixing the first and second divided top plates at a predetermined sliding position, wherein a flat tread surface is formed by upper surfaces of the first and second divided top plates, and First and second ridges extending in the longitudinal direction, each having an upper surface projecting upward and a concave groove formed on the lower surface, are formed at portions of the tread surface forming portions of the first and second divided top plates that match in the vertical direction. A retractable top plate, wherein a top surface of the second ridge is slidably fitted into a groove of the first ridge. 7. A comb-shaped first and second divided top plate is formed by fixedly connecting base ends of a plurality of long rods arranged in parallel with a parallel gap in the width direction by a spacing member. Then, the tip of the long rod of one of the divided top plates is slidably inserted in the gap between the long rods of the other divided top plate in the axial direction, and the first and second divided top plates are inserted. A long auxiliary rod and a hollow rod for inserting an auxiliary rod are connected to each other on both outer sides in a point-symmetric relationship, and the long auxiliary rod for one of the divided top plates is a hollow rod for inserting an auxiliary rod of the other divided top plate. And the outer surface of the long auxiliary rod of one of the divided top plates is flush with the outer surface of the hollow rod for inserting the auxiliary rod of the other divided top plate. An elastic top plate characterized by being in a state.