JPH0521838B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lifting device capable of lifting personnel, materials, etc. to a high place by vertically moving a lifting platform from a base. The present invention relates to an elevating device that can lower an elevating platform to a position close to the ground when the mechanism is reduced to the minimum size, and further allows the elevating platform to have less rocking.

[Conventional technology]

BACKGROUND OF THE INVENTION Lifting devices that move a lifting platform up and down have been widely used for work such as assembly, painting, repair, etc. in high places such as highways and building construction, and for moving work in high places such as buildings. It has become common for workers to work at high places by placing workers, materials, etc. on this lifting device and lifting them upwards, or by loading and unloading unnecessary materials at high places. ing. Many types of elevating devices with different structures are available.
For example, a boom-type lifting device with a bucket attached to the tip of the boom that can extend and contract as well as tilt up and down with respect to the ground, and
Scissor-type lifting devices, in which links that can rotate in a letter-shaped manner are piled up and down, and ladder-type lifting devices, in which a bucket is installed at the top of a ladder that extends and retracts up and down, are widely used.

Among these, the boom type elevating device has the feature that it can lift the bucket to a high place with a relatively simple structure. However, it is difficult to lift the bucket in the vertical direction, and it is only possible to move the bucket up and down with the boom tilted diagonally, and a wide working range is required to tilt the boom. . The scissor-type lifting device has the feature that it is easy to lift vertically. However, when the scissor mechanism is folded, the height of the platform is higher than the ground, making it difficult for people to get on and off the platform or to lift materials.

In addition, with a ladder-type lifting device that connects multiple ladders, it is easy to lift the bucket in the vertical direction, and the bucket can be lifted to a high place within a relatively narrow range. Because of this, workers had to climb up the ladder to board the bucket, making the process of going up and down complicated.

For this reason, the supports are arranged concentrically towards the outside.
An elevating device has also been proposed in which a sliding tube and an elevating tube are slidably inserted into the elevating tube, combined in a telescopic shape, and a platform is fixed to the elevating tube (submitted on February 18, 1988). patent application filed by the present applicant). However, in this configuration, each member assembled in a telescopic manner expands to the outside of the support, and becomes unstable when the sliding tube slides from the support to the maximum height position. For this reason, when the platform is lifted to its maximum height, the platform tends to sway due to rattling, creating a sense of unease among the workers.

[Problem that the invention seeks to solve]

The present invention is capable of lifting a platform from a low height by assembling a support, a sliding tube, and an elevating tube in a telescopic manner so as to expand outward, and fixing the platform to the elevating tube. We are making it possible to do so. A freely movable intermediate cylinder is provided inside the support body, and an interlocking cylinder fixed to the sliding cylinder is inserted into the intermediate cylinder. In this way, the combination of the support body and the sliding tube is combined with the intermediate tube and the interlocking tube in a double telescopic manner, so the sliding tube can be lifted upward stably without deforming or bending in the left-right direction. be able to.

[Means for solving problems]

In view of the above-mentioned drawbacks, the present invention includes a slightly flat base, a cylindrical support fixed perpendicularly to the center of the upper surface of the base and having a vertical cavity inside, and an inner periphery of the support. a sliding tube that is substantially the same as the outer circumference of the support and can move up and down outside the support;
An elevating tube whose inner periphery is almost the same as the outer periphery of the sliding tube and can move up and down outside the sliding tube, and an opening having a flat shape and large enough to allow the sliding tube to come out and go in the center, A platform is fixed to the elevating tube, a hollow intermediate tube is housed inside the support so that it can be slid vertically, and the platform is fixed to the top of the sliding tube and can be moved up and down in the internal space of the intermediate tube. An interlocking cylinder that moves, one end and the other end of which are connected to the upper part of the support body, an operating band whose middle part is endlessly wound around the inner and outer peripheries of the intermediate cylinder, one end of which is connected to the upper end of the support body, and the other end of which is connected to the upper part of the support body. are respectively connected to the lower ends of the interlocking cylinders, and a first interlocking band whose intermediate portion is bent at the upper end of the intermediate cylinder, one end connected to the upper end of the support and the other end connected to the lower end of the interlocking cylinder, A first interlocking band whose intermediate portion is bent at the upper end of the intermediate tube, one end connected to the upper end of the support and the other end connected to the lower end of the interlocking tube, and the intermediate portion is bent at the lower end of the intermediate tube. a second interlocking band, a hydraulic cylinder interposed between the support body and the intermediate cylinder to move the intermediate cylinder up and down, and a hydraulic cylinder interposed between the sliding cylinder and the elevating cylinder to convert the elevating cylinder into a sliding cylinder. The present invention provides a lifting device characterized by comprising a lifting means for moving the lifting device up and down relative to the lifting device.

[Effect]

In the present invention, the cylinders are assembled in a telescopic manner by means of a support, a sliding cylinder, and an elevating cylinder so that the diameter becomes larger toward the outside, and furthermore, they are combined in a telescopic manner inside by a support, an intermediate cylinder, and an interlocking cylinder. has been done. Therefore, a double telescopic lifting mechanism is constructed above the support, and even if the sliding tube is extended to the maximum extent from the support, the sliding tube is held stably and there is no play. It is possible to stably hold the platform without sliding or bending due to bumps or the like.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a perspective view showing the appearance of this embodiment.
FIG. 2 is a side view showing a state in which the elevating mechanism of the above is reduced and the elevating platform is lowered to the lowest position, and FIG. 3 is a plan view of the same.

First, a vehicle body 1 serving as a base is flat and has a square shape, and wheels 2 for horizontally moving the vehicle body 1 are pivotally supported at each of the four corners of the vehicle body 1. At the center of the upper surface of the vehicle body 1, a vertically rectangular lifting mechanism 3 is vertically fixed, in which a plurality of booms slide in a telescopic manner to extend and retract. It is fixed by a reinforcing plate 4 having an extended triangular shape. A lifting table 5 is held at the upper end of the lifting mechanism 3 so as to be movable up and down with respect to the lifting mechanism 3.

Next, the structure of this elevating mechanism 3 will be explained with reference to FIG. 4.

The lifting mechanism 3 is composed of a lower boom 6 as a support with a square cross section, a middle boom 7 as an intermediate cylinder, an upper boom 8 as an interlocking cylinder, and a top plate 9.
A middle boom 7 is inserted into the inner space of the lower boom 6 so as to be slidable up and down, and an upper boom 8 is inserted into the inner space of the middle boom 7 so as to be able to slide up and down. At the upper end of the upper boom 8, there is a top plate 9 which has a rectangular shape and is slightly larger than the cross-sectional shape of the lower boom 6.
is fixed horizontally, and a cover body 10 as a sliding tube with a square cross section is fixed to the lower surface of the top plate 9 with an opening facing downward.
The space in the internal cross section of 0 is made slightly larger than the outer diameter of the cross section of the lower boom 6. As a result, the upper boom 8, the top plate 9, and the cover body 10 as a sliding tube can each move up and down at the same time, and the cover body 10 can move up and down while covering the outer periphery of the lower boom 6. The cover body 10 is configured to cover the entire lifting mechanism 3 when the lifting mechanism 3 is contracted. Note that cuts 1 are made in the lower four corners of the cover body 10 to prevent contact with the reinforcing plate 4.
1 is formed.

Next, a hydraulic cylinder 12 is inserted into the internal space of the upper boom 8 in parallel with the upper boom 8, and the lower part of the hydraulic cylinder 12 is connected to a connecting piece 13.
The cylinder rod 14 of the hydraulic cylinder 12 is connected to the upper surface of the vehicle body 1. Further, sprockets 15 and 16 are pivotally supported at the upper and lower ends of the middle boom 7, and a chain 17 as a first interlocking band is wound around the sprocket 15. One end of the chain 17 is connected to the lower boom 6. The other end of the chain 17 is connected to the lower end of the upper boom 8. Further, a chain 18 as a second interlocking band is wound around the sprocket 16, one end of the chain 18 is connected to the internal upper end of the lower game 6, and the other end of the chain 18 is connected to the lower end of the upper boom 8. It is connected to. Further, sprockets 19 and 20 are pivotally supported at the upper and lower ends of the middle boom 7, respectively, and a chain 21 as an operating band is wound between the sprockets 19 and 20, and both ends of the chain 21 are respectively It is connected near the upper end of the lower boom 6. In this chain 21, a plurality of rollers 22 are pivotally supported at intervals in the vicinity where it contacts the sprocket 19.
This roller 22 is formed to have approximately the same diameter as the distance between the outside of the middle boom 7 and the inside surface of the cover body 10.

Next, explaining the elevating table 5, a rectangular elevating tube 23 whose inner diameter is larger than the outer diameter of the cover body 10 is slidably inserted into the outer periphery of the cover body 10. At the upper end of this elevator tube 23 is a flat platform 2 with a rectangular opening in the center for loading materials, etc.
A triangular rib 25 is fixed between the side surface of the elevator cylinder 23 and the lower surface of the platform 24 for reinforcement. In addition, notches 26 are formed at the four corners of the elevator tube 23 to prevent contact with the reinforcing plate 4 when the elevator platform 5 is lowered, and handrails are provided on the outer periphery of the upper surface of the platform 24 to prevent personnel from falling. 27 is vertically erected and covers the outer periphery of the upper surface of the platform 24.

Further, a mechanism for moving the lifting table 5 up and down with respect to the cover body 10 will be explained with reference to FIG. A hydraulic cylinder 28 serving as a lifting means is housed within the cover body 10, and the hydraulic cylinder 28 is fixed to the lower surface of the top plate 9. Two pulleys 30 and 31 are rotatably supported at the other end of the cylinder rod 29 of the hydraulic cylinder 28.
Small operating holes 32 and 33 are opened in the upper side of the cover body 10, a pulley 34 is pivotally supported in the operating hole 32, and a pulley 34 is pivotally supported in the operating hole 32. A pulley 35 is pivotally supported in the operating hole 33. Fixing fittings 36 and 37 are fixed to two places on the lower surface of the top plate 9, one end of a chain 38 is connected to the fixing fitting 36, and the chain 38 is wound around the pulley 30. The direction of the chain 38 is then reversed by a pulley 34, and the other end of the chain 38 is connected to the elevating tube 23. Further, one end of a chain 39 is connected to the fixing metal fitting 37, and the chain 39 is wound around the pulley 35.
After having its direction reversed in 5, chain 39
The other end is connected to the elevating tube 23.

Next, the operation of this embodiment will be explained.

First, the state shown in FIG. 2 shows the state in which the lifting platform 5 has been lowered to the lowest position. In this state, the lifting mechanism 3 is contracted, and the lifting tube 2 is
3 is located at the lowest position with respect to the cover body 10. Therefore, a worker can board the platform 24 from the ground. At this time, the upper half of the cover body 10 is exposed through the space opened in the center of the platform 24. Therefore, the workable area of the platform 24 is the handrail 2.
7 and the upper outer periphery of the cover body 10, forming a square annular space. When the lifting platform 5 is at the lowest position, it is in the state shown by 5-A in FIG. 7, and it rises vertically upward from this position.

Next, in order to raise only the lifting platform 5, firstly, oil pressure is supplied to the hydraulic cylinder 28, and the cylinder rod 29 is pushed downward in FIG. As a result, the pulleys 30 and 31 are pushed downward and roll while winding the chains 38 and 39. By extending the cylinder rod 29 from the hydraulic cylinder 28, the chain 38,
39 will be drawn into the cover body 10, and the chains 38 and 39 will be pulled into the pulley 34,
35 is drawn into the cover body 10, and at the same time lifts the elevating cylinder 23 upward relative to the cover body. Therefore, the platform 24 also rises at the same time as the elevator tube 23 lifts up, and rises to the point where the top plate 9 fits into the rectangular opening in the center of the platform 24, and the platform 24 and the top By using the plate 9, the upper surface of the lifting platform 5 can be made into a flat rectangular surface.
At this time, the lifting platform is at the position shown in FIG. 5-B.

In this way, after the lifting platform 5 is raised relative to the cover body 10, hydraulic pressure is supplied to the hydraulic cylinder 12 to press the cylinder rod 14 downward.
Therefore, the connecting piece 13 connected to the hydraulic cylinder 12 pushes the middle boom 7 upward relative to the lower boom 6, but at this time, the sprocket 15 pivotally supported on the upper end of the middle boom 7 winds the chain 17. Since it rises while moving, the length of the chain 17 on the outside of the middle boom 7 becomes longer, and at the same time, the upper boom 8 is lifted above the middle boom 7 by the chain 17.

Therefore, by operating the hydraulic cylinder 12, the middle boom 7 and upper boom 8 slide telescopically from the lower boom 6, and the moving distance of the upper boom 8 increases to about twice the operating distance of the cylinder rod 14. It turns out. When the lifting mechanism 3 is extended and contracted by the hydraulic cylinder 12, the middle boom 7 is lifted up until the lower end of the middle boom 7 is located slightly below the upper end of the lower boom 6 at the maximum extension. It will be extended to a point slightly shorter than about three times the total length. Therefore, the lifting table 5 is lifted to the position shown by 5-C in FIG. 6, and the lifting table 5 is lifted to a high position.

In this operation of lifting the middle boom 7 by the hydraulic cylinder 12, the chain 21 wound around the outer periphery of the sprockets 19 and 20 is simultaneously rolled, and the chain 21 moves from the inside of the middle boom 7 to the outside of the middle boom 7. will be moving towards. Therefore, the plurality of rollers 22 connected to the chain 21 at equal intervals are sequentially fed out from the inside of the middle boom 7 to the outside of the middle boom 7. It moves while rolling between the inner surface of the Therefore, the cover body 10 is pushed upward by the lifting mechanism 3, the lower end of the cover body 10 is separated from the upper end of the lower boom 6, and the cover body 10
Even if there is a gap between the inner boom 7 and the inner boom 7, the roller 22 will be interposed between the gap and the roller 22 will come into contact with the inner wall of the cover body 10, thereby preventing rattling. will no longer occur. As a result, even if a bending stress is applied to the side surface of the cover body 10, the pressure is transmitted to the middle boom 7 via the rollers 22, so that the cover body 10 will not be deformed by being deviated from the vertical direction. The platform 24 sliding on the side surface of the cover body 10 is always held horizontally. The elongated cover body 1 is then rotated by the roller 22.
0 configuration is maintained, no wobbling occurs due to wind or vibration, and no rocking of the platform 24 occurs.

Workers can then move on the flat top surface of the platform 24 and perform work such as building construction, painting, or inspection.

When lowering the lifting platform 5, the middle boom 7 is pushed back into the lower boom 6 by returning the hydraulic pressure of the hydraulic cylinder 12 and contracting the cylinder rod 14, contrary to the above. This results in
The chain 18 pulls down the upper boom 8 so that the upper boom 8 can be pushed into the middle boom 7. At the same time, the chain 21 is sequentially drawn into the middle boom 7 by the sprocket 20, the rollers 22 connected to this chain 21 are also sequentially drawn into the middle boom 7, and the rollers 22 on the outside of the middle boom 7 are The cover body 10 will be stored in the middle boom one after another, and the cover body 10 will slide while contacting the outer surface of the lower boom 6. And lifting platform 5
is lowered from the state 5-C to the state 5-B in FIG. The lifting platform 5 can be lowered by the operation.

〔Effect of the invention〕

Since the present invention is configured as described above, the support,
The sliding tube and the elevating tube are combined outward in a telescopic manner, and the supporting body, intermediate tube,
The interlocking tubes are assembled telescopically inward, and the sliding tubes are held from the inner and outer peripheries, so there is less rattling even when extended to the maximum height. Therefore, the platform does not swing due to vibrations or wind, and the sliding tube is not bent left or right, so the worker can work without feeling anxious.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of a lifting platform according to an embodiment of the present invention, FIG. 2 is a side view showing the lifting platform lowered to the lowest position, and FIG. 3 is a plan view of the same as above. Figure 4 is a sectional view showing the internal structure of the lifting mechanism;
Figure 5 is a sectional view showing the relationship between the cover body and the lifting platform;
FIG. 6 is an exploded perspective view showing a mechanism for vertically moving the platform, and FIG. 7 is a side view showing the vertical movement of the platform. DESCRIPTION OF SYMBOLS 1... Vehicle body, 3... Lifting mechanism, 5... Lifting platform, 6... Lower boom as a support body, 7... Middle boom as an intermediate cylinder, 8... Upper boom as an interlocking cylinder, 10... Cover body as a sliding cylinder. , 12...hydraulic cylinder, 1
7... Chain as a first interlocking band, 18... Chain as a second interlocking band, 29, 20... Sprocket, 21... Chain as an operating band, 22...
Roller, 23... Lifting cylinder, 24... Platform, 28... Hydraulic cylinder as a lifting means,
38, 39...Chain.

Claims (1)

[Claims] 1 A slightly flat base, a cylindrical support fixed perpendicularly to the center of the upper surface of the base, and having a vertical cavity inside, the inner periphery of which is approximately the same as the outer periphery of the support. A sliding tube that can move up and down on the outside of this support, an elevator tube whose inner periphery is almost the same as the outer periphery of the sliding tube and can move up and down on the outside of this sliding tube, and a flat shape in the center. A platform is formed with an opening large enough to allow the sliding tube to move in and out, and is fixed to the elevator tube, an intermediate tube with a hollow interior that is housed inside the support body so as to be able to slide vertically, and the sliding tube. An interlocking tube is fixed to the upper part of the movable tube and moves up and down in the inner space of the intermediate tube, and one end and the other end are respectively connected to the upper part of the support body, and the intermediate portion is wound endlessly around the inner and outer periphery of the intermediate tube. a first interlocking band whose one end is connected to the upper end of the support, the other end is connected to the lower end of the interlocking tube, and whose intermediate portion is bent at the upper end of the intermediate tube; and one end is connected to the upper end of the support. A second interlocking band whose other end is connected to the lower end of the interlocking cylinder, and whose intermediate portion is bent at the lower end of the intermediate cylinder, is interposed between the support body and the intermediate cylinder, and moves the intermediate cylinder up and down. 1. An elevating device comprising: a hydraulic cylinder for moving the elevating tube and a lifting means interposed between the sliding tube and the elevating tube to move the elevating tube up and down with respect to the sliding tube.