JPH084462A - Step rack - Google Patents

Abstract

PURPOSE:To permit the placement on a step plate safely by allowing castors to be shifted in contact with a floor surface when a lower part step board is put into an accommodation state, while putting the castors into a fixed state through the floating-up of the castors in a used state. CONSTITUTION:When a lower part step board 29 is in an unused state where the step board 29 is turning-accommodated between a rear part frame body 5 and a pair of front part frames 15 and 15, the castors 28,... are brought into contact with a floor surface by a castor turning mechanism 37, and the lower end parts of the rear leg parts 4 and 4 of the rear part frame body 5 and the front leg parts 14 and 14 of a pair of front part frame bodies 15 and 15 are floated up from the floor surface. Then, the transfer to a used place or an accommodation place through the revolution of the castors 28,... is performed by holding the handrail bars 19 and 19 or holding the rear part frame body 5. In use, a lower part step board 29 is positioned in front of the front part frame bodies 15 and 15, and the castor installation plates 26 and 26 are turned by the castor turning mechanism 37, and the castors 28,... are floated from the floor surface, and the front leg parts 14 and 14 are brought into contact with the floor surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step stand used in a product storage or the like.

[0002]

2. Description of the Related Art Heretofore, this type of step stand has been used in which casters with stoppers are attached in order to facilitate movement and to ensure up and down safety.

[0003]

Since the conventional step base is equipped with casters with stoppers, the stopper pieces of the casters with stoppers must be operated both during movement and during use, which is troublesome. There was a drawback to say. In addition, there is a drawback in that the operator forgets to operate the stopper piece and goes up to the step plate, and the step table moves to cause a fall accident.

In view of the above-mentioned conventional drawbacks, the present invention has been made.
The casters can be easily moved by the casters, and by positioning the lower step stand so that it can be used at the time of use, the casters can be lifted from the floor surface and safely climbed onto the step board, and the casters can be placed on the floor surface. It is an object of the present invention to provide a safe-to-use step stand that does not easily climb to the step plate when in contact with it.

The above and other objects and novel characteristics of the present invention will become more fully apparent when the following description is read in view of the accompanying drawings. However, the drawings are for explanation only and do not limit the scope of the present invention.

[0006]

In order to achieve the above object, the present invention is directed to a rear frame made of a pipe material formed in an inverted U shape and an upper end at a portion closer to an upper portion than a central portion of the rear frame. The pair of front frames are fixed to the upper side of the pair of front frames at a predetermined interval and the pair of front frames are positioned on the same side as the lower side of the rear frame. A plurality of step plates and a pair of front frames, which are located in front of the pair of front frames pivotally supported at lower portions of the pair of front frames. A lower step stand to which at least one lower step plate that can be housed between the rear frames is attached, a portion near the lower end of the rear frame, and a portion near the lower end of the pair of front frames. When A pair of support bars whose both ends are fixed, and a pair of caster supports which are rotatable around the rear end portions of the pair of support bars and are fixedly attached to a portion below the rear end of the lower step stand. The bar and the pair of caster supporting bars are not attached to the floor surface when not in use and are attached to the parts near the both ends, and the lower end portion of the rear frame and the lower end portions of the pair of front frames are attached to the floor surface. Four casters that come into contact with each other so that the lower ends of these frames can be lifted above the floor surface when in use, and the four step casters are placed when the lower step stand is in use. The caster rotation mechanism rotates the four casters so that they are in contact with the floor when they are rotated so that they are not in contact with the floor and the step stand is in the stored state. Constitute the platform.

[0007]

In the step table constructed as described above, the casters come into contact with the floor surface when the lower step table is placed in the housed state and can be moved easily, and the step plate is not located below. Cannot be easily climbed, and when the lower step stand is placed in the used state, the contact with the floor surface of the casters is released and it becomes fixed so that the step board of the lower step stand can be used to safely climb on the step board. it can.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.

In the first embodiment of the present invention shown in FIGS. 1 to 7, reference numeral 1 denotes a rear frame having a pipe material formed in an inverted U shape, and the rear frame 1 has an upper portion 2 vertically positioned.
A rear frame body 5 including a rear leg portion 4 which is vertically positioned through a central portion 3 which is inclined rearward by approximately 10 degrees.
An upper reinforcing bar 6 interposed between the lower positions of the upper portion 2 of the rear frame body 5 and a rectangular frame-shaped center interposed between the central portions of the central portions 3 of the rear frame bodies 5. Part reinforcing bar 7 and lower reinforcing bars 8, 8 interposed between the upper frame and the lower part of the rear leg portion 4 of the rear frame body 5.
And a fall prevention piece 9 which is fixed by welding or the like so as to project downward from both sides of the central portion of the rear leg portion 4 of the rear frame body 5 and whose lower end portion is flush with the lower end portion of the rear frame body 5. , 9 and hooks 10, 10 fixed to the upper bar 2a of the upper part 2 of the rear frame body 5 at positions near both ends by welding or the like.

Reference numerals 11 and 11 denote a pair of front frames fixed by welding or the like so as to project forward from both side bars 2b, 2b of the rear frame body 5 of the rear frame 1. Reference numeral 11 denotes an upper step plate supporting portion 12 which projects forward from a lower position of the upper portion 2 of the rear frame body 5, and a central step plate supporting portion 1 which projects approximately 130 degrees forward and downward from the upper step plate supporting portion 12.
3, a front frame body 15 formed of a pipe material composed of front leg portions 14 positioned in the vertical direction via the central step plate support portion 13 and an upper step plate support portion 12 of the front frame body 15 The central step plate supporting portion 1 is provided between the rearward portion and the upper leg portion 14 near the upper portion.
3, a step plate support bar 16 fixed by welding or the like so as to be positioned in parallel with the front frame body 15, a portion of the front frame body 15 near the center and a lower portion, and a rear leg body of the rear frame body 5. Upper and lower reinforcing bars 17 made of a round pipe material and a square pipe material which are substantially horizontally interposed between the upper and lower reinforcement bars 17,
18 and one end formed in substantially the same shape as the upper shape of the front frame body 15 is fixed to a portion of the upper portion 2 of the rear frame body 5 near the upper portion by welding or the like, and the other end is supported by the central step plate. A handrail bar 19 fixed to the lower portion of the portion 13 by welding or the like, and between the handrail bar 19 and the front frame body 15 by welding or the like so as to be in parallel with the upper portion 2 of the rear frame body 5. The reinforcing vertical bar 20 is fixed.

Reference numerals 21 and 22 denote the pair of front frames 1
1 and 11, the front frame bodies 15 and 15 of the central step plate supporting portions 13 and 13 and the front leg portions 14 and 1
4 is a front upper and lower portion reinforcing bar fixed by welding or the like between the portions near the lower portion of 4.

Reference numeral 23 is a lower step plate having both ends fixed to the pair of front frame bodies 15, 15 at the front upper reinforcing bar 21 by welding or the like.

Reference numeral 24 denotes the pair of front frame bodies 15,
15 is a central step plate whose both ends are fixed to the central part of the central step plate supporting portions 13 of 13 by welding or the like.

Reference numeral 25 denotes the pair of front frame main bodies 15,
Both end portions are fixed to the upper step plate supporting portions 12, 12 of 15 by welding or the like.

26, 26 are the lower reinforcing bars 18, 18
The pivot pin 27 between the front part and the rear part of the
A pair of caster mounting plates rotatably mounted by means of a pair of caster mounting plates 26, 26.
When stored, the lower end of the rear frame main body 5 and the pair of front frame main bodies 15, 15 are housed in portions near both ends of the rear frame main body 5.
The lower end of the rear frame main body 5 and the lower end of the pair of front frame main bodies 15 and 15 are lifted above the floor when used. 28, 28, 28 are attached.

29 is the pair of caster mounting plates 2
6 and 26 are located in front of the front frame bodies 15 and 15 at the time of use by the rivets 30 and 30 at positions near both ends of the caster mounting plate 26, and when not in use, the front frame bodies 15 and 15 are located. And the rear frame body 5
Is a lower step table that can be housed between the lower step table 29 and the lower step table 29. The lower step table 29 has a pair of inverted U-shaped lower step table frames 32, 32 with a reinforcing bar 31 fixed to the center thereof.
An upper step plate 33 interposed between the upper parts of the pair of lower step table frames 32, 32, and a lower step plate 34 interposed between substantially the center parts of the pair of lower step table frames 32, 32. And a pair of the lower step stand frames 32, 32 and the reinforcing bar 35 interposed between the portions of the lower step stand frames 32 near the front lower part.

37, the four casters 28, 28, 2 when the lower step table 29 is placed in a used state.
When 8 and 28 are rotated so as not to contact the floor surface and the lower step stand 29 is positioned in the stored state, the four casters 28, 28, 28 and 28 are rotated so as to contact the floor surface. This caster rotating mechanism is a caster rotating mechanism 37. The caster rotating mechanism 37 is mounted on the mounting brackets 38, 38 mounted on the caster mounting plates 26, 26 at substantially the center thereof.
It is composed of a rod 41 rotatably attached at 0 and 40.

42, 42 are the lower reinforcing bars 18, 18
It is a stopper that supports the lower step stand 29 when the lower step stand 29 fixed to the inner central portion of the lower step stand is in the stored state.

In the step stand 43 constructed as described above, the lower step stand 29 is rotatably housed between the rear frame body 5 and the pair of front frame bodies 15, 15 as shown in FIG. As shown, the casters 28, 28, 28, 28 are brought into contact with the floor surface by the caster rotating mechanism 37, and the rear legs 4 and 4 of the rear frame body 5 and the front legs of the pair of front frame bodies 15 and 15 are brought into contact with each other. 14,
The lower end of 14 floats above the floor, and handrail bars 19 and 1
It is possible to smoothly move the casters 28, 28, 28, 28 to the use place or storage place by holding the 9 or the rear frame body 5 by rotating the casters 28, 28, 28, 28.

When used, the lower step base 29 is rotated as shown in FIG.
By positioning it on the floor surface in front of 5, 15, the caster mounting plate 26,
26 rotates, the casters 28, 28, 28, 28 are released from contact with the floor surface and float up, and the rear leg portions 4 and 4 of the rear frame body 5 and the front leg portions of the pair of front frame bodies 15 and 15 are also lifted. The lower end portions of 14, 14 are in contact with the floor surface. Therefore, it is possible to safely climb up and down using the step plates 34 and 33 of the lower step stand 29, the lower step plate 23, the central step plate 24, and the upper step plate 25.

[0021]

Different Embodiments of the Present Invention Next, different embodiments of the present invention shown in FIGS. 8 to 13 will be described. In the description of these different embodiments of the present invention, the same components as those of the first embodiment of the present invention will be designated by the same reference numerals and redundant description will be omitted.

The second embodiment of the present invention shown in FIGS. 8 and 9 is mainly different from the first embodiment of the present invention in that
Lower step stand 2 with one step plate 33 attached
9A is attached, the same operation and effect as those of the first embodiment of the present invention can be obtained even with the step stand 43A configured by using the lower step stand 29A thus formed.

In the third embodiment of the present invention shown in FIGS. 10 to 13, the main difference from the first embodiment of the present invention is a caster rotating mechanism 37A, which is a lower step. Position the table 29 in the stored state,
Casters 2 on casters 28, 28, 28, 28 when moving on casters 28, 28, 28, 28
The position of the pivot pins 27, 27 of the lower step table 29 and the mounting bracket 38 are set so that the lower step table 29 does not rotate to a usable state even if a force is applied in the direction of housing the 8, 28, 28, 28. The positional relationship with the pivot pin 40 is set so as to form a straight line or an obtuse angle with respect to the rotating direction when the lower step table 29 is housed. Even with the step stand 43B configured by using the caster rotating mechanism 37A thus formed, the same operation and effect as those of the first embodiment of the present invention can be obtained, and the lower step stand 29 pops out during the movement. It is possible to reliably prevent such problems.

[0024]

As is apparent from the above description, the following effects can be obtained in the present invention.

(1) A rear frame made of a pipe material formed in an inverted U shape, and an upper end fixed to an upper portion at a portion closer to an upper portion than a central portion of the rear frame has an inclined surface on the upper side and the lower portion on the lower side. A pair of front frames located on the same plane as the lower end portions of the rear frames, a plurality of step plates fixed at predetermined intervals to the upper slope portions of the pair of front frames, and the pair of front portions. At least one piece that can be positioned in front of the pair of front frames pivotally supported at a portion near the lower part of the frame and can be housed between the pair of front frames and the rear frame. A lower step base to which the above lower step plate is attached, a pair of support bars whose both ends are fixed to a lower end portion of the rear frame and a lower end portion of the pair of front frames, This one A pair of caster support bars that are rotatable around the rear end portions of the support bars and are fixedly attached to a portion from the lower rear end of the lower step table, and a pair of caster support bars near both end portions of the caster support bars. When not in use, it is placed in a non-contact state with the floor surface, and the lower end portions of the rear frames and the lower end portions of the pair of front frames are brought into contact with the floor surface. The four casters that come into contact with the floor surface so that they can be lifted up more, and when the lower step stand is placed in a use state, the four casters are rotated so as not to contact the floor surface, and the step stand When the lower step stand is in the stored state, it is composed of a caster rotating mechanism that rotates the four casters into a state of contacting the floor surface. Causing the casters contact the floor surface and to position the lower footstep in use casters lifted from the floor, the lower end portion of the rear frame and a pair of front frame is in contact with the floor surface.
Therefore, the movement can be easily performed, and the work of the step plate up and down and the upper part can be performed safely.

(2) According to the above (1), since the casters can be used or not used by rotating the lower step stand, the operation is easy and natural.

(3) According to the above (1), it is impossible to climb the step plate in the state where the lower step stand is housed, so that an accident due to mischief or the like can be efficiently prevented.

(4) According to the above (1), since the structure is simple, it can be easily manufactured.

(5) According to the second aspect, the same effects as the above (1) to (4) can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a front view showing the first embodiment of the present invention.

FIG. 3 is a plan view showing a first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of the essential parts of the first embodiment of the present invention.

FIG. 5 is an explanatory view showing a mounting state of the lower step stand and the caster rotating mechanism according to the first embodiment of the present invention.

FIG. 6 is an explanatory view showing an operating state of the lower step stand of the first embodiment of the present invention.

FIG. 7 is an explanatory diagram of a moving state according to the first embodiment of this invention.

FIG. 8 is a side view showing a second embodiment of the present invention.

FIG. 9 is a front view showing a second embodiment of the present invention.

FIG. 10 is a side view showing a third embodiment of the present invention.

FIG. 11 is an explanatory view showing a mounting state of a lower step stand and a caster rotating mechanism according to an embodiment of the third embodiment of the present invention.

FIG. 12 is an explanatory diagram showing an operating state of a lower step table according to the third embodiment of the present invention.

FIG. 13 is an explanatory diagram of a moving state according to the third embodiment of the present invention.

[Explanation of symbols]

 1: rear frame, 2: upper part, 3: central part, 4: rear leg part, 5: rear frame body, 6: upper reinforcing bar, 7: central reinforcing bar, 8: lower reinforcing bar, 9: fall prevention piece , 10: hook, 11: front frame, 12: upper step plate support part, 13: central step plate support part, 14: front leg part, 15: front frame body, 16: step plate support bar, 17: upper reinforcement Bar, 18: lower reinforcing bar, 19: handrail bar, 20: vertical reinforcing bar, 21: front upper reinforcing bar, 22: front lower reinforcing bar, 23: lower step plate, 24: central step plate, 25: upper step Plate, 26: caster mounting plate, 27: pivot pin, 28: caster, 29, 29A: lower step stand, 30: rivet, 31: reinforcing bar, 32: lower step stand frame, 3 : Upper step plate, 34: Lower step plate, 35: Front reinforcing bar, 37, 37A: Caster rotating mechanism, 38: Mounting bracket, 40: Pivoting pin, 41: Rod, 42: Stopper, 43, 43A, 43B: Step stand.

Claims (1)

[Claims] 1. An inverted U-shaped rear frame made of pipe material, and an upper end fixed to an upper portion of the rear frame at a portion closer to an upper portion than a central portion of the rear frame is an inclined surface and a lower end portion is the rear portion. A pair of front frames located on the same plane as the lower ends of the frames, and a plurality of step plates fixed at predetermined intervals to the inclined surface portions on the upper side of the pair of front frames,
Positioning in front of the pair of front frames rotatably pivoted to the lower portion of the pair of front frames and accommodating between the pair of front frames and the rear frame. And a lower step stand to which at least one lower step plate is attached, and a pair of both ends fixed to a portion of the rear frame near the lower end and a portion of the pair of front frames near the lower end. Support bars, a pair of caster support bars which are rotatable around the rear end portions of the pair of support bars and are fixedly attached to a portion from the lower rear end of the lower step stand, and the pair of casters. When not in use, it is attached to the portions near the both ends of the support bar and is not in contact with the floor surface, and the lower end portion of the rear frame and the lower end portions of the pair of front frames are brought into contact with the floor surface and used. Occasionally, the four lower casters come into contact with the floor so that the lower ends of these frames can be lifted above the floor, and when the lower step stand is in use, the four casters are not exposed to the floor. And a caster rotation mechanism for rotating the four casters into a state of contacting the floor surface when the step base is placed in a stored state.