JPH012999A - lift device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to construction sites where workers or materials are lifted upward for work such as assembling or painting buildings at high places. Regarding the lifting device used for loading and unloading materials that are no longer needed in the Regarding the elevating device in which a telescopic upper boom and a lower boom are inserted, the telescopic mechanism consisting of the middle boom, upper boom, and lower boom is telescopically operated by operating a winding device provided on the vehicle body. The invention relates to a lifting device.

[Conventional technology]

Lifting devices that raise and lower platforms are used for assembly, painting, and repairs at high places such as highways and building construction, and workers and materials are placed on these platforms to be lifted and used to remove unnecessary construction materials. They were working to load and unload. In this conventional lifting device, a pair of arms are pivoted at the center to form a group, and a multi-v! , a pantograph 2 extension mechanism is used in which two sets of arms are connected vertically (so-called scissor type), and in order to increase the maximum lifting height of the lifting device, the length of each set of arms must be made longer. Or,
The number Mi of the arms to be connected had to be increased.

For this reason, if we were to design a lifting device that can increase the height that can be climbed, we would have to use a pantograph with a capacity of 13 ifl, which would increase the height of the lifting platform when the pantograph is folded, making it difficult for workers to climb. The work of getting on and off the platform and loading and unloading materials was cumbersome. In addition, since looseness and tension accumulate in the connecting shafts at each joint of the pantograph, when the platform is raised high, the platform is likely to sway due to wind, etc., making workers feel uneasy. Ta.

In order to eliminate these drawbacks, various proposals have been made in the past, and for example, a structure as disclosed in US Pat. No. 3,820,631 has also been proposed.

In this proposed structure, a lower boom and an upper boom, which can move in a straight line, are inserted into and removed from the middle boom, the lower end of the lower boom is pivotally supported on the vehicle body side with a pin, and the upper end of the upper boom is It is assembled to form an X-shape by being pivotally supported on the platform with pins. With this structure, the length of the boom itself becomes longer, so the height of the platform can be lowered when it is in the folded state, and the platform can be raised to a higher position.

However, in this invention, the mechanism that extends the lower and upper booms from the middle boom is composed of a screw and a female thread that engages with the screw, so the lower and upper booms extend and retract at a slow speed relative to the middle boom, allowing the platform to be moved quickly. It was something that could not be done. In addition, since the lower and upper booms are slid by a screw installed in the center of each middle boom,
The total length of the lower boom and upper boom can only be set to about half the length of the middle boom, and the length of the lower boom and upper boom that extend and retract from the middle boom can only be set to half the length of the middle boom. The structure made it impossible to lift the platform further into the hole.

You can also insert other booms into the boom and expand and contract the boom.
, a structure in which the length itself is increased has also been proposed. For example, in Patent Publication No. 119556 of 1971, in Figure 4 of the middle cylinder of this drawing, a lower boom and an upper boom of narrower diameter are inserted into a thicker diameter middle boom, and the lower boom and upper boom inserted inside are inserted into the middle boom. A structure has been proposed in which the total length of the boom is increased by sliding it from the boom, thereby raising the platform further.

However, in this configuration, there is no mechanism to synchronize the extensometers between the lower boom and the upper boom, which are pulled out from the middle boom. , 1. (Each slides individually, and the mobility of both is restricted by a link mechanism with bars.For this reason, it is not possible to lift the platform vertically while keeping it horizontal. It was not possible to lift the boom horizontally to a height of 1.5 cm.Also, when the lower boom and upper boom, which were stored inside the middle boom, extended and contracted,
Since the amount of movement is regulated by the link mechanism formed by the bar, it is impossible to completely synchronize the amounts of movement of both. For this reason, it was not possible to connect the lower boom to the car body and the upper boom to the platform with pins, etc., and any errors that could not be absorbed had to be made by rollers that were in contact with the car body and platform. For this reason, the platform has a structure that easily sways due to the accumulation of looseness due to the large number of pivot points in the link mechanism and the transfer caused by the rollers, and it is extremely unstable as it easily sways due to wind etc. It made me feel uneasy.

In order to eliminate these drawbacks, for example, patent l
Proposals have been made, such as patent application No. 41289 of 1983 and patent application No. 191065 of 1982. In these applications, the lower boom and the upper boom are inserted into the middle boom, and the ends of the lower boom and the upper boom are connected by flexible connecting means, and the two connecting means are connected to the middle boom. It has a structure in which the direction of movement is changed by means of a turning means that is pivotally supported.

In this configuration, the lower boom is pulled out from the middle boom and the upper boom is pushed out from the middle boom at the same time, and the amount of movement of the lower and upper booms is regulated by the linking means, so the amount of movement of the lower and upper booms is the same. The pair of middle booms pivoted at the center can rotate in an X-shape to push the platform vertically upward.

In this configuration, the lower and upper booms are housed inside the middle boom, so when the lower and upper booms are extended from the middle boom, their total length will be approximately three times that of the middle boom. This allows the platform to be lifted higher than when it is folded.

[Problem that the invention seeks to solve]

However, in these newly proposed lifting devices, in order to operate the lower and upper booms that are pulled out from the two sets of middle booms, a hydraulic cylinder installed in the upper boom must apply operating force in the length direction of the hydraulic cylinder. The lower and upper booms had to be moved from the middle boom to the lower and upper booms using this operating force. The middle boom itself moves upward at the same time as the lifting platform is lifted upward, and the middle boom housing the hydraulic cylinder is lifted to a height of about half the height of the lifting platform.

The hydraulic cylinder itself is quite heavy, so if these hydraulically operated devices are lifted at the same time as the middle boom, the height of the center of gravity will be higher, and if the middle boom is lifted, the center of gravity will also be higher. It had drawbacks.

In addition, since the hydraulic cylinder is housed in the middle boom, a hydraulic cable must be installed between the hydraulic pressure generation source installed on the vehicle body and the middle boom, and a long hydraulic cable must be extended to the lower boom and middle boom. This would increase the weight and at the same time make the piping and connection mechanism extremely complex.

[Means for Solving the Problems 1] The present invention consists of a movable vehicle body, a lifting platform located above the vehicle body that can be raised and lowered up and down, and a pair of middle stages that are rotatably supported in the center and combined in an X shape. A boom, a lower boom that slides along the length of each middle boom and whose lower ends are connected to the vehicle body, and a lower boom that slides along the length of each middle boom and whose upper ends are connected to a lifting platform. A lifting device consisting of an upper boom and a synchronizing means provided in each middle boom to synchronize the movement of the lower boom and the upper boom in the middle boom. An elevating device characterized by comprising a rotationally driven winding means, and a flexible connecting means having one end wrapped around the winding means and the other end connected to a middle boom via a lower boom. This is what we provide.

[Effect]

In the present invention, there is a gate means between the lower boom and the upper boom, and the lower boom and the upper boom, which are pulled out from the middle boom, are synchronous in their respective expansion and contraction amounts. A winding means is provided on the vehicle body, and a flexible connecting means that is wrapped around the winding means is connected to the middle boom via the lower boom, and the winding means winds up the connecting means. As a result, the pulling force is transmitted to the middle boom, causing the lower boom to be pulled out from the middle boom. Then, the synchronizing means described above comes into play, and the lower and upper booms are pulled out by the same amount of expansion and contraction than the middle boom, allowing the platform to be lifted to a higher position.

When operating this telescoping mechanism, heavy items such as hydraulic cylinders are not stored in the middle boom.
Since the weight is extremely light, even if the middle boom is extended and raised high, the center of gravity will not change significantly.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

The code 1 in the circular is a car body that carries an engine, an oil field source, etc., and wheels 2 and 3 are mounted on the front, rear, left and right sides of the car body
is supported by a shaft 7, and a crawler is installed between the wheels 2 and 3.
4 is wrapped around the vehicle body 1 so that it is located on both sides. An elevating mechanism 5 is mounted on the upper surface of the vehicle body l, and an elevating table 6 is fixed to the upper part of the elevating mechanism 5.
A handrail 7 is provided around the area. This lifting mechanism 5 is 4
It consists of sets of telescopic booms, and each set of telescopic booms is composed of a middle boom lO1, a lower boom 11, and an upper boom 12. Middle boom 10.1 with two pieces in one set
0 are rotatably connected at the center by a connecting shaft 13, and two X-shaped middle booms 10 are arranged at both ends of the connecting shaft 13, respectively. Fixed shafts 14 are arranged above and below between the middle booms 10 inside each set, and the middle booms IO inside each set are assembled in a ladder shape by the connecting shafts 13 and the fixed shafts 14. and each middle boom 10
A lower boom 11 is slidably inserted in the length direction of the middle boom 10 from the lower end opening of each middle boom 10, and an upper boom 12 is inserted freely in the length direction of the middle boom 10 from the upper end opening of each middle boom 10. It is an insertion. And lower boom 11
Connecting pieces 15 and 16 are attached to each tip of the upper boom 12, and the connecting pieces 15 are rotatably connected to the shaft support plates 17 fixed to the four front and rear corners of the vehicle body 1 by pins. The connecting piece 16 is rotatably connected to a shaft supporting plate 1 fixed to the front and rear four corners of the lower surface of the lifting platform 6 by means of a pin.

Further, a kick mechanism 20 is fixed at the center of the vehicle body 1, and this kick mechanism 20 is fixed to a hydraulic cylinder 21 that expands and contracts vertically at the center of the vehicle body 1, and to a rond of this hydraulic cylinder 21, and extends horizontally. and each middle boom 1
It is made up of a bar 22 with a push-up that contacts the central lower surface of 0. Next, a hydraulic motor 25 is fixed on the upper surface of the vehicle body 1 slightly offset to the front side of the vehicle body 1, and a winding drum is fixed to this hydraulic motor 25 as will be described later.

Next, FIGS. 4 and 5 show the internal structure of the above-mentioned telescopic boom, that is, the middle boom 10. The middle boom 10 is made of bent thin steel plate and has a hollow cross-sectional shape. A lower boom 11 is slidably inserted through the lower end of the middle boom 10. This lower boom 11
is thin #! It has a cross-sectional shape with a hollow interior made by bending a plate, and the first F-stage boom 12 inserted from the other open end of the middle-stage boom 10 is slidably inserted into this lower-stage boom 11. Fan-shaped shaft support pieces 30.31 are fixed to both ends of the middle boom 10, and a pair of guide rollers 32.3 are attached to each of the shaft support pieces 30.31.
3 is rotatably supported on a shaft, and a pair of guide rollers 32
A pair of guide rollers 3 are installed on the upper and lower surfaces of the lower boom 11.
3 is in contact with the upper and lower surfaces of the upper boom I2, respectively.

A bearing (reverse 34) is fixed to the upper end of the middle boom 10 with a slight release to the side, and this bearing is supported by two booms IJ35 and 36 rotatably supported on the plate 34 at intervals. A storage groove 38 is formed in the center of the lower surface of the upper pool 12, and the storage groove 38 is slightly inwardly extending to form a space extending in the length direction.A chain 37 is stored in this storage groove 38. One end of the chain 37 is fixed to the lower end of the upper boom 12, which is the lower part of this storage groove 38.The chain 37 is then wound around the pulleys 35 and 36 to reverse its direction, and the other end of the chain 37 is fixed to the lower end of the upper boom 12, which is the lower part of the storage groove 38. It is connected to the upper end of the boom 11. Next, rollers 39 and 40 are connected to the upper and lower ends of the lower boom 11, respectively.
is pivotally supported, and a boot IJ41 is rotatably supported on the same axis with the center of swing of the connecting piece 15 as its axis center. The wire 42 extends between the lower boom 11 and the upper boom 12 via rollers 41 and 40, and the direction of the wire 42 is reversed by the roller 39.
further extends between the middle boom 10 and the upper boom 12, and its terminal end is connected and fixed to the lower end of the middle boom 10.

FIG. 5 shows a cross section taken along the line A-A in FIG. 4, and a chain 37 and a wire 42 are inserted into a storage groove 38 formed on the lower surface of the upper pool 12 and extending in the length direction. , a wire 42 is also inserted between the middle boom 10 and the lower boom 11.

Next, FIG. 6 shows the lower part of the lower boom 11, in which the wire 42 extends almost parallel to the surface of the vehicle body 1, its direction is changed by the boom U41, and the wire 42 is further extended by the roller 40. The direction of movement is lower boom 1
1 is inverted so that it faces inward. Therefore, by moving the wire 42 back and forth, the direction of action of the pulley 41 and roller 40 is reversed, and the extended wire 42 can move back and forth in the internal space of the lower boom 11 in its length direction.

Further, FIG. 7 shows the vicinity of the hydraulic motor 25, which is operated by hydraulic pressure, and its rotating output shafts 45 and 46 extend to the left and right, respectively.
Two drums 47, 48 are fixed to the output shaft 45, and two drums 49, 50 are fixed to the output shaft 46, respectively. A wire 42A is wound around the drum 47, a wire 42B is wound around the drum 48, a wire 42C is wound around the drum 49, and a wire 42D is wound around the drum 50. Each of the wires 42A-D extends in the direction of the shaft support plate 17 on the vehicle body 1, and each of the wires 42A-D is inserted 1111 into the lower end opening of the lower boom 11.

Next, FIG. 8 shows the hydraulic system of the lifting device of this embodiment. The suction side of a hydraulic pump 57 operated by an engine 56 is connected to an oil tank 55 that stores hydraulic oil, and the discharge side of this hydraulic pump 57 is connected to a three-stage hydraulic switching valve 58. The discharge side of the hydraulic switching valve 58 communicates with the yuzu tank 55. The hydraulic cylinder 21 is connected to the output side of the hydraulic switching valve 58.
and hydraulic motor 25 are connected in parallel.

Next, the operation of this embodiment will be explained.

First, the engine 56 installed in the vehicle body 1 is operated,
By operating this engine 56, the hydraulic pump 5
7 is driven, hydraulic oil in the oil tank 55 is sucked from the hydraulic pump 57 to generate oil pressure, and the hydraulic oil is supplied toward the oil pressure switching valve 58.

First, when raising and lowering the lifting platform 6, the hydraulic switching valve 58 is switched to supply oil discharged from the hydraulic pump 57 in the forward direction. Then, the hydraulic cylinder 21 operates, and the hydraulic cylinder 21
By increasing the length of , the push-up bar 22 is pushed upward. This push-up bar 22 contacts the lower surface near the center of each of the four middle booms 10 and
This will have the effect of pushing 0 upward. Therefore, the lower boom 11 and the upper boom 12 are pulled out and lifted from both ends of the middle boom 10, respectively, and the lifting platform 6 is lifted upward at the same time. Therefore, as shown in FIG. 9, the lifting platform 6 is lowered to the lowest position and the middle booms 10 are arranged parallel to each other, and the lower boom 11 and the upper boom 12 are housed inside the middle boom 10. The middle boom 10 is lifted up a little from its original state, and the middle boom 10 rotates around the connecting shaft 13 so as to take a slightly X-shape. By this operation of the hydraulic cylinder 21, the middle boom IO performs an initial lifting operation. The hydraulic motor 25 is then activated, and the hydraulic motor output shaft 45.
46 rotate in the forward direction, and each drum 47.4B,
49. Rotate 50 and wrap the wire 42A-
Rotate D in the winding direction. Therefore, the wires 42A-D are wound up and act to pull out the wires 42A-D from the opening of the lower boom 11. The tips of the wires 42 pulled out from the lower boom 11 span the inner and outer surfaces of the lower boom 11, respectively, and the tips are connected to the lower end of the middle boom 10, so when the wires 42A-D are pulled out, Middle boom lO
is pulled out so as to be pushed upward from the lower boom 11. For this reason, the lower boom 11 has the same effect as being pulled out from the middle boom 10, but the lower end of the upper boom 12 is connected to the lower boom 11 by a chain 37, and the pulley 35 moves the lower boom 11 in the direction of movement. Since the lower stage boom 11 is pulled out from the middle stage boom 10, the upper stage boom 12 is also slid via the chain 37 so as to be pushed up from the upper end opening of the middle stage boom 10. Therefore wire 42A
-D is taken up by the drums 48 to 50, and at the same time, the lower boom 11 and the upper boom 12 are slid by the same amount of extension from both ends of the middle boom 10, and the total length of the telescopic boom body gradually decreases. become longer. Since the lower booms 11 are each supported by a shaft support plate 17, the intervals between them are constant, so the middle boom 10 rotates about the connecting shaft 13 in an X-shape, and the lifting platform 16 This will have the effect of lifting it higher. At this time, the distance from each shaft support plate 17 to the connection shaft 13 and the distance from the shaft support plate 18 to the connection shaft 13 are both mechanically equal, and the connection shaft 13 always rises in a direction perpendicular to the vehicle body 1. It happens. Therefore, the lifting platform 6 is always parallel to the vehicle body 1 and lifted in a direction perpendicular to the vehicle body 1.

In FIG. 1O, the initial lifting is completed by the lifting mechanism 20, and each lower boom 11 is moved by the hydraulic motor 25.
, the upper boom 12 is pulled out from the middle boom 10, and the elevator platform 6 is lifted halfway.

In addition, in FIGS. 2 and 3, the wire 4 is operated by the hydraulic motor 25.
2 is wound up and the lifting platform 6 is lifted to its maximum height position.

Once the lifting platform 6 has been lifted to a predetermined position, the hydraulic motor 25 stops its operation by closing the hydraulic switching valve 58, the output ail 145.46 is fixed, and the lifting platform 6 is closed. The height position is held at that position.

When the elevator platform 6 is to be lowered, the hydraulic switching valve 58 is switched in the opposite direction to operate the hydraulic motor 25 in the reverse direction. Then, the output shafts 45 and 46 rotate in opposite directions, and the wires 42A-D that were wound by the drums 47 to 50 are gradually unwound, and the wire 42 is returned to the middle side of the lower boom 11, and the wire 42 is gradually pushed between the middle boom 10 and the lower boom 11. Therefore, the lifting platform 6 acts to insert the wire 42 into the lower boom 11 by its own weight, and the lower boom 11 and the upper boom 12 slide so as to be inserted into the middle boom 10. Therefore, the length of the telescopic boom body is shortened, the pair of middle booms 10 rotate in opposite directions around the connecting shaft 13, and the lifting platform 6 is lowered to narrow the opening angle.
Move closer to the vehicle in one direction. and drum 4
When all the wires 42A-D are unwound by steps 7 to 50, the lower boom 11 and the upper boom 12 are all housed in the middle boom 10, and the entire length of the telescopic boom body becomes the shortest length, as shown in FIG. The state returns to the state shown, and the height of the lifting platform 6 is lowered to the lowest position.

〔effect〕

Since the present invention is configured as described above, the upper boom and the lower boom are extended and contracted from the middle boom to 5'? , 31
In an elevating device that moves a platform up and down, a telescopic mechanism consisting of a middle boom, a lower boom, and an upper boom can be extended and retracted by winding up a connecting means using a winding mechanism provided on the vehicle body. For this reason, there is no need to provide a hydraulic cylinder or other hydraulic actuating device within the middle boom, so the weight of the entire telescoping mechanism can be reduced. Therefore Shinii! Even if the mechanism is expanded and contracted to raise the platform high, the center of gravity does not become high, and the platform can be held stably. In addition, since there is no hydraulic cylinder installed in the middle boom, there is no need for hydraulic cables or other piping, and the mechanism is extremely simple, with all operating mechanisms fixed on the vehicle body, making assembly and maintenance extremely easy. be.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a state in which the elevating platform is lifted to the maximum height position in an elevating device which is an embodiment of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a front view of the same. , 4th
The figure is a side sectional view showing the internal configuration of the telescopic mechanism, and Fig.
A vertical cross-sectional view taken along the line A-A in the figure, Fig. 6 is an enlarged perspective view showing the vicinity of the lower opening of the lower boom, Fig. 7 is a configuration diagram showing the vicinity of the hydraulic motor, and Fig. 8 shows the hydraulic system. Piping diagram, Figure 9 is a side view showing the lifting platform lowered to the lowest position, and Figure 10 is a side view showing the lifting platform raised halfway and the telescopic mechanism rotated in an X-shape. . 1... Vehicle body, 5... Lifting mechanism, 6... Lifting platform, 1
0...middle boom, 11...lower boom, 12...
・Upper boom, 37... Chain, 42... Wire, 25... Hydraulic motor, 45.46... Output shaft,
47.48.49.50...Drum. Figure 1 Figure 2 Figure 3 Figure 5 Figure 8 Figure 9

Claims (1)

[Claims] A movable vehicle body, a lifting platform located above the vehicle body that can be raised and lowered, a pair of middle booms that are rotatably supported in the center and combined in an X shape, and each middle boom slides in the length direction. A lower boom that moves and has its lower end connected to the vehicle body, an upper boom that slides in the length direction of each middle boom and whose upper end is connected to the lifting platform, and A lifting device comprising a synchronizing means for synchronizing the travel distances of the lower boom and the upper boom in the middle boom, a winding means provided on the vehicle body and driven to rotate in either forward or reverse directions, and a winding means for the winding means. An elevating device characterized by comprising a flexible connecting means having one end wrapped around the other end and the other end connected to a middle boom via a lower boom.