JPH0233640B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lifting device capable of lifting personnel and materials to a high place by moving a lifting platform upward and downward above a vehicle body. It has the same functionality as the conventional model with a simple structure that allows you to raise and lower it with The present invention relates to a lifting device that can move hydraulic wiring connecting a hydraulic circuit together with a spacer.

[Conventional technology]

Assembly at high places such as highways and building construction,
For painting and repair work, a lifting device that raises and lowers a lifting platform is often used, and workers and materials are placed on this lifting platform to be lifted up or lowered for work.

In this conventional elevating device, a pair of arms are pivoted at the center to form one set, and a pantograph-like extension/contraction mechanism is used in which the plurality of sets of arms are connected in the vertical direction (so-called scissor type).
In order to increase the maximum lifting height of the lifting device with this mechanism, it was necessary to lengthen each arm or increase the number of connecting arms. If a lifting device is designed that can increase the height of the lift, multiple sets of pantographs must be used, and the height of the lifting device with the telescoping mechanism folded becomes high, making it difficult for workers to get on and off the platform. The work of loading and unloading materials was troublesome.

For this reason, a lifting device has been devised in which multiple booms are telescopically inserted into the inside of the arm so that one arm can extend in its length direction (for example, No. 134487 (Unexamined Japanese Patent Publication No. 1983)
-36900), Patent Application No. 191065 (1982)
35100) etc.). In this newly proposed lifting mechanism, two sets of booms are combined in an X-shape so that they can rotate freely at the center, two sets of boom bodies are arranged in parallel, and four upper and lower arms are used. The vehicle body was connected to the lifting platform. For this reason, the number of booms required to be used increases, the number of component parts becomes extremely large, the manufacturing and assembly becomes complicated, and the cost becomes high. In addition, the boom and arm have an extremely large number of sliding parts, and since sliding parts made of polyamide resin are usually attached to these sliding points, the number of parts that need to be replaced regularly increases, making inspection and maintenance difficult. This was expensive and the work was troublesome.

Due to these drawbacks, a lifting device has been proposed in which the boom body is made into a single piece and expands and contracts to form a Z-shape when viewed from the side (Japanese Patent Application No. 95797 of 1982 (Japanese Patent Application No. 60-242199)). ), etc.) This new one-boom elevating device uses a boom that expands and contracts in multiple stages, so there are steps between each boom, making it difficult to secure a pivot point to support the elevating platform horizontally. Therefore, it was difficult to interpose a leveling mechanism between the telescoping boom and the lifting platform. For this reason, a structure has been devised in which a spacer is slid between the uppermost boom and the cover body to support the load.

[Problem that the invention seeks to solve]

As mentioned above, a lifting device has been developed that uses a single boom body to horizontally move the lifting platform up and down. In order to connect the control panel and the hydraulic pressure generation source, it is necessary to connect multiple hydraulic wiring lines between the vehicle body and the lifting platform. This hydraulic wiring (pressure rubber hose) is housed inside the boom body, and is usually pulled out or taken in as the boom body expands and contracts, creating a structural nuisance.

[Means to solve the problem]

In the present invention, a movable vehicle body, a flat elevator platform placed above the vehicle body and having approximately the same floor area as the vehicle body, and a plurality of booms with different outer diameters are assembled in a telescopic manner and can be expanded and contracted in the length direction. The base of the boom, which has a large outer diameter, is pivoted to the rear of the top surface of the vehicle body, and the tip of the boom, which has a small outer diameter, is pivoted to the bottom of the platform. And the whole thing is Z when viewed from the side.
In an elevating device configured to have a letter-shaped configuration, the upper end of a cover body is fixed to the upper end of the small-diameter boom at the top of the telescopic boom body, and this cover body extends downward from the top end of the uppermost boom. A hydraulic cylinder is provided between the top surface of the vehicle body and the boom with a large outer diameter to lower the telescopic boom body, and a hydraulic cylinder is provided between the bottom surface of the platform and the cover body. A hydraulic cylinder is interposed to hold the platform horizontally, and one end of a flexible linking means is connected to the upper end of the next stage boom from the top stage.
This connecting means extends between the cover body and the uppermost boom, and is pulled out from the tip of the uppermost boom.
After bending, the other end is connected to a lifting platform, and the connecting means is provided with at least one spacer that moves between the cover body and the uppermost boom, and the connecting means is further provided with a spacer along its length. The present invention provides a lifting device characterized in that hydraulic wiring is also provided.

[Effect]

When the telescopic boom body is extended, each boom is pulled out in a telescopic manner, and at the same time, the telescopic boom body is depressed, so that the lifting platform is lifted upward. At this time, a gap is created between the top boom and the cover body, but the linking means connected from the top to the next boom moves, and the spacer provided on this linking means slides through this gap. Fill in the gaps.

Therefore, the gap between the cover body and the boom is filled with the spacer and there is no looseness, so that the cover body will not bend even if a load is applied to the cover body. Since the connecting means to which the spacer is connected is also provided with a hydraulic line, as the connecting means moves and bends, the hydraulic line also moves and bends. Therefore, the arrangement of the hydraulic lines is performed in common with the movement of the spacer, the structure is simplified, and long hydraulic lines can be reliably arranged.

〔Example〕

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

There are front wheels 2 and rear wheels 3 on the front, rear, left and right sides of the vehicle body 1, respectively.
is pivotally supported so that the vehicle body 1 can move freely, and a power source box 4 containing an engine, a hydraulic pump, etc. is attached to the lower part of the vehicle body 1.

A pair of shaft support pieces 5 are fixed to the rear end of the upper surface of the vehicle body 1 at intervals, and a hollow lower boom 6 with a rectangular cross section is inserted between both shaft support pieces 5. The support piece 5 and the lower boom 6 are rotatably connected by a pin 7. A pair of pins 8 are fixed to the left and right sides of the upper surface of the vehicle body 1 at positions opposite to the shaft support piece 5 (front end of the vehicle body 1), and these pins 8 and the outside of the lower boom 6 are connected to each other. A hydraulic cylinder 9 for suppressing depression is interposed between them.

The tip of the lower boom 6 has a rectangular opening, and an internal hollow boom 10 having a square cross section is slidably inserted into this opening. A hollow end boom 11 is slidably inserted therein. A cover body 12 having a U-shaped cross section and opening downward is fixed to the tip of the front boom 11, and the upper inner surface of the cover body 12 is spaced apart so that it is parallel to the upper surface of the lower boom 6. , a gap is formed between the front boom 11 and the cover body 12 such that the lower boom 6 can be inserted therethrough. The lower boom 6 is set to have a length approximately equal to the length of the vehicle body 1, and the middle boom 10 and front boom 11 are also set to have approximately the same length as the vehicle body 1. 10,
A telescopic boom body 13 is formed by the front boom 11 .

In the figure, reference numeral 16 is a flat lifting platform having almost the same floor area as the vehicle body 1, and a pair of shaft supporting pieces 14 are fixed to the front end of the lower surface of the lifting platform 16 at intervals. A cover body 12 is inserted between the support pieces 14, and the shaft support piece 14 and the cover body 12 are connected to the pin 1.
5, they are rotatably connected. Further, a pair of pins 17 are fixed to each side of the lower surface of the lifting table 16 at a position opposite to the shaft support piece 14 (front end of the lifting table 16), and each pin 17 and the cover body 12 are connected to each other. Hydraulic cylinders 18 are interposed between both sides, and a handrail 19 is installed around the upper surface of the lifting platform 16.

FIG. 5 shows the internal structure of the above-mentioned telescopic boom body 13, in which the lower boom 6, the middle boom 10, and the front boom 11 are inserted in a telescopic manner so that they can be extended and retracted. The cover body 12 attached to the tip of the front boom 11 has an upper side that is approximately 2/3 of the total length of the lower boom 6 and a lower side that is approximately 1/3 of the total length of the lower boom 6.
The left side in the figure is formed diagonally. At the top of this lower boom 6, 1/3 from the left end
A pin hole 21 for connecting the hydraulic cylinder 9 is provided at a position of approximately 1/2, and a pin hole 21 for directly connecting the hydraulic cylinder 18 is provided at a position of approximately 1/2 of the total length of the cover body 12 at the lower part of the cover body 12. 22 are provided.

Further, a shaft support 23 is fixed to the left end position of the upper part of the cover body 12, and a roller 24 that contacts the upper surface of the lower boom 6 is pivotally supported within this shaft support 23. A chain 41 as a connecting means is inserted between the upper outer side of the boom 11 and the inner side of the cover body 12, and one end of the chain 41 is the upper end of the middle boom 10 (position C on the right side in the figure).
The chain 41 is pulled out from the upper end of the cover body 12 and is folded double over the upper surface of the cover body 12, and its terminal end is connected to the lower surface of the lifting platform 16. At the bottom of this chain 41, there are a plurality of rollers 42 as spacers made of a slippery material made of polyamide resin.
are connected at intervals. A cable bearer 43 as a hydraulic wiring made by bundling a plurality of hydraulic rubber hoses is provided in parallel with this chain 41. The cable bearer 43 can be moved simultaneously with the chain 41, and its upper end is attached to the lifting platform 16. It is connected to the control panel provided.

A cable receiver 52 is positioned on the lower surface of the lower boom 6 parallel to the lower boom 6 at an interval, and the lower boom 6 and the cable receiver 52 are connected by support pieces 53 and 54. A lower cable carrier 55 is placed on this cable receiver 52, one end of the lower cable carrier 55 is connected to the upper end of the cable receiver 52, and the other end is connected to the middle boom 10.
It is connected to the lower surface of the upper end, and the lower cable carrier 55
and the cable carrier 43 are communicated within the middle boom 10.

Figure 6 shows a cross section taken along line A-A in Figure 5.
FIG. 8 is an enlarged view of the upper left part of FIG.

Auxiliary plates 26 are fixed to both sides of the tip of the middle boom 10 (right end in FIG. 5), and a support shaft 28 is fixed to the lower part of the auxiliary plates 26. Front boom 11 on the left and right respectively
A roller 29 that comes into contact with the lower surface of the outer periphery is rotatably supported. A pulley 30 that rotates a chain (not shown) connecting the lower boom 6 and the front boom 11 is pivotally supported at the center of the support shaft 28 . Further, the auxiliary plate 26 is provided with a slider 31 that comes into contact with the outside of the front boom 11 and a slider 32 that comes into contact with the inside of the cover body 12. Also,
A rail 44 made of polyamide resin is fixed to the upper and outer surface of the front boom 11 in parallel with the length direction of the front boom 11, and the chain 41 is brought into contact with the upper surface of the rail 44 so that it can roll. There is.

L-shaped angle pieces 47 are connected to both sides of the chain 41, and a U-shaped shaft support 46 opening upward is fixed between the ankle pieces 45. The support body 46 has a shaft 4
The roller 42 is pivotally supported by 7.
Further, a cable holder 48 is attached to one angle piece 45 slightly horizontally, and a hydraulic rubber hose 49 is held between the cable holder 48 and the hydraulic rubber hose 49 on the lower surface of the cable holder 48.
A cable carrier 43 is formed.

Next, FIG. 7 shows a cross section taken along line B-B in FIG.
A support piece 33 is fixed inside the support piece 3 parallel to the side surface, and a pin 34 is installed between the side surface of the shaft support 23 and this support piece 33, and the roller 24 is supported on each pin 33. It has been done. A liner 3 that abuts the side surface of the lower boom 6 is provided on the side surface of the cover body 12.
5 is fixed, and the middle boom 10 is attached to the lower boom 6.
A liner 36 that abuts the outer periphery of is fixed.
A sprocket wheel 42 is pivotally supported on the lower inner wall of the front boom 11, and a chain 43 is wound around the sprocket wheel 42.

Next, the operation of this embodiment will be explained.

Figures 2 and 3 show the state in which the lifting boom body 13 is reduced and the lifting platform 16 is lowered to the lowest position.In this state, a worker is on the lifting platform 16 and materials are placed on it. Then, the lifting platform 16 is raised.

First, in order to raise the lifting platform 16, the engine in the power supply box 4 is activated to generate hydraulic pressure, and each hydraulic cylinder 9, 18 and a telescoping hydraulic cylinder (not shown) housed in the front boom 11 are activated. ) by supplying hydraulic pressure to each of them.

When hydraulic pressure is supplied to the hydraulic cylinder for expansion and contraction, the middle boom 10 is slid and pulled out from the lower boom 6, and the front boom 11 is slid and pulled out from the middle boom 10, thereby expanding the gap between the pins 7 and 15. let Further, by extending the hydraulic cylinder 9, the lower boom 6 is rotated about the pin 7, and the telescopic boom body 13 is lifted so as to be tilted with respect to the vehicle body 1. The extension speed of the telescopic boom body 13 by the hydraulic cylinder housed in the front boom 11 and the telescopic boom body 13 by the hydraulic cylinder 9
When the tilting speeds of are synchronized, the pin 15 of the cover body 12 rises perpendicularly to the vehicle body 1.

Furthermore, the lifting platform 16 rotates around the pin 15 due to the extension force of the hydraulic cylinder 18, and the cover body 1
2 and the lifting platform 16. By synchronizing the extension amounts of these hydraulic cylinders 9 and 18, the lifting platform 16 becomes parallel to the vehicle body 1, and the vehicle body 1, telescopic boom 13, and lifting platform 16 are formed in a Z-shape when viewed from the side.

Once the lifting platform 16 has risen to a predetermined height position, when the operator stops the operation of each hydraulic cylinder 9, 18 and the hydraulic cylinder in the front boom 11, the lifting platform 16 is maintained at that height position. , and can perform work such as assembly, repair, and painting at heights.

During the telescoping operation of the telescoping boom body 13,
The roller 24 comes into contact with the upper surface of the lower boom 6 and moves while rolling. This telescopic cover body 12, lower boom 6, middle boom 10, front boom 11
Since there is a gap between them, wobbling will occur, and there is a risk of deformation due to the load.
Therefore, the load on the lifting platform 16 is reduced to the hydraulic cylinder 1.
This stress is transmitted to the pin hole 22 through the pin hole 8 and causes the cover body 12 to bend downward due to the stress applied to the pin hole 22. However, as mentioned above, since the roller 24 is rolling on the upper surface of the lower boom 6, the load is supported by the roller 24 and transmitted to the lower boom 6, so the cover body 12 is not deformed and the lifting platform 16 While maintaining the height at that height, it extends upward together with the front boom 11. If the lower boom 6 continues to move relative to the cover body 12, the upper end of the lower boom 6 will eventually pass the lower surface of the roller 24.

However, when this telescopic boom body 13 expands and contracts, the tip of the middle boom 10 is connected to the front boom 11 as described above.
The chain 4 connected to the tip C of the middle boom 10 slides away from the upper end and is pulled out.
1, the length of play at the top of the cover body 12 is introduced between the front boom 11 and the cover body 12. The chain 41 slides on the rail 44 and moves smoothly, and at the same time the roller 42 fixed to the chain 41 also follows. Therefore, each roller 42 fixed to the chain 41 is also moved along with the middle boom 10 in the moving direction of the middle boom 10, and the rollers 42 are moved into the space formed between the front boom 11 and the cover body 12. Moving. The roller 42 rolls while contacting the inner wall of the cover body 12, but the load applied to the cover body 12 is transferred to the roller 42, the chain 41, and the rail 4.
4 and the like to the upper surface of the front boom 11. In this way, the roller 24 moves to the lower boom 6.
Even if they are separated further apart, each roller 42 of the cover body 12 will support them, and the cover body 12 will not be deformed by the load of the lifting platform 16.
At this time, since the cable holder 48 also moves inside the cover body 12 following the chain 41, the hydraulic rubber hose 49 also moves inside the cover body 12 in the same way as the chain 41.
2, and the cable carrier 43 connects to the chain 4.
The slack of the same length as the slack of 1 is drawn in.

FIG. 9A shows the initial state of expansion, in which the chain 41, roller 42, and cable 43 are loosely placed on the upper surface of the cover body 12, and the load applied to the pin hole 22 is transferred by the roller 24. Supported. Further, the lower cable carrier 55 is folded double and placed on the cable receiver 52.

Next, as the telescopic boom 13 continues to extend and retract, the lower boom 6 will be pulled out from the cover body 12, and the rollers 24 will be separated from the upper surface of the lower boom 6 (see FIG. 9B). At this time, the roller 42 has already been pulled out between the front boom 11 and the cover body 12 by the middle boom 10, and the load applied to the pin hole 22 is transmitted to the cover body 12 via the roller 42 etc. , the distance between the cover body 12 and the front boom 11 is maintained parallel to each other. Further, the lower cable carrier 55 is pulled upward at the same time as the middle boom 10 is pulled out, and the slack portion thereof is sequentially pulled out from the cable receiver 52.

When the middle boom 10 is further pulled out and the distance between it and the tip of the front boom 11 increases, these rollers 42 are disposed at equal intervals between the front boom 11 and the cover body 12 and roll. The front boom 11 is successively pulled out from the middle boom 10 and finally stops in the state shown in FIG. 9C, and this state is the maximum extension position of the telescopic boom body 13. At this time,
The entire length of the lower cable carrier 55 is the cable receiver 5.
2, and a part of it is not pulled out from cable receiver 5.
It remains on top of 2. During this operation, the cable carrier 43 attached to the chain 41 is also drawn into the cover body 12 at the same time. In this way, the rolling contact between the rollers 24 and 42 is switched, and the telescopic boom body 13 slides smoothly.

Also, when the telescopic boom body 13 is contracted, it moves so that the front boom 11 is inserted into the middle boom 10, and the chain 41 moves in the opposite direction to the above, and the chain 41 is pushed out from the upper end of the cover body 12. and are sequentially placed on the upper surface of the cover body 12. Then, when the upper end of the lower boom 6 approaches the lower end of the cover body 12, the roller 24 starts rolling on the upper surface of the lower boom 6. In this way, when the telescopic boom body 13 is contracted, the operations are performed in the order shown in FIG. Further, as the middle boom 10 is contracted, the lower cable carrier 55 is also pushed down, folded onto the cable receiver 52, and sequentially stored.

In this embodiment, the roller 42 as a spacer is formed into a cylindrical shape, but the spacer can be square or polygonal to achieve the same effect as long as it fills the gap between the cover body 12 and the front boom 11. Of course it is possible.

〔Effect of the invention〕

Since the present invention is configured as described above, the load of a large lifting platform approximately the same size as the vehicle body is supported by the cover body, and the load applied to the cover body is successively transmitted to the telescopic boom body by the rollers and spacers. be able to. Therefore, even if a step formed by multiple booms of the telescopic boom body occurs during operation, the spacer slides to eliminate the step, and even if the telescopic boom body is extended long, the load on the platform can be reliably supported. Since the connecting means connecting the spacers and the hydraulic wiring are shared, it is easy to organize the long chain and the hydraulic wiring, and it does not get in the way during work.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a side view showing the lifting platform lowered to the lowest position, Figure 3 is a front view of the same as above, Figure 4 is a side view showing the lifting platform extended to the highest position, and Figure 5 is the telescopic boom. A side view showing the internal structure of the body, FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5, and FIG. 7 is a cross-sectional view taken along line B--
8 is an enlarged sectional view showing the vicinity of the roller wound around the front boom, and FIG. 9 is an explanatory view showing the operation of the telescopic boom body. 1... Vehicle body, 6... Lower boom, 10... Middle boom, 11... Front boom, 12... Cover body, 13
... Telescopic boom body, 24 ... Roller, 41 ...
A chain as a connecting means, 42... rollers as a spacer, 43, 55... a cable bear as hydraulic wiring.

Claims (1)

[Scope of Claims] 1. A movable vehicle body, a flat elevator platform placed above the vehicle body and having approximately the same floor area as the vehicle body, and a plurality of booms with different outer diameters are assembled telescopically in the longitudinal direction. The base of the boom with a large outer diameter is pivotally supported at the rear of the upper surface of the vehicle body, and the tip of the boom with a smaller outer diameter is mounted on the front of the lower surface of the lift platform. In a lifting device that is pivotably supported and configured so that the whole has a Z-shape when viewed from the side, the upper end of a cover body is fixed to the upper end of the small diameter boom at the top of the telescopic boom body, and this cover body is The telescopic boom body is extended downward from the top end of the top stage of the boom to cover it, and a hydraulic cylinder that lowers the telescopic boom body is interposed between the top surface of the vehicle body and the boom with a large outer diameter. A hydraulic cylinder that holds the lifting platform horizontally is interposed between the bottom surface of the platform and the cover body, and one end of a flexible connecting means is connected to the upper end of the boom of the next stage from the top stage, and this connecting means extends the space between the cover body and the top boom, pulls it out from the tip of the top boom, bends it, and then connects the other end to the lifting platform. An elevating device characterized in that at least one or more spacers are provided that move by a distance, and the connecting means is further provided with hydraulic wiring along its length.