JP2949472B2 - Aerial work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle provided with a workbench drop prevention device.

[0002]

2. Description of the Related Art In aerial work vehicles having a scissor link mechanism, the work platform is raised by closing the scissor link mechanism with a hydraulic cylinder during various vehicle maintenance such as battery maintenance. Prevention measures rely on the reliability of the hydraulic cylinder, or insert a square bar or pipe into the space above the rail where the roller on the moving side link of the scissor link mechanism rolls to form a rigid rod.

However, if an unexpected accident occurs during the operation, for example, if the hydraulic hose is cut off, the scissors link mechanism starts to open and the workbench descends, and a worker working thereunder is at risk. In addition, since the insertion of the timber, pipes, etc. is performed after raising the work table, it is troublesome,
It was easy to omit.

For this reason, for example, Japanese Utility Model Laid-Open No. 6-67491
As shown in the publication, a hook-shaped hooking portion is locked to the other link at the tip of a hooking member rotatably provided on one link of the scissors link mechanism, thereby restricting the opening of the scissors link mechanism. To prevent the workbench from falling.

[0005]

However, in the above-described structure, the length of the hanging member cannot be adjusted, so that the ceiling is so low that the working table cannot be raised to a height necessary for setting the hanging member. In that case, it cannot be used.
In addition, since the hooking member is bridged between the two links in an oblique state, a large strength is required for the hooking member.

Accordingly, an object of the present invention is to provide an aerial work vehicle in which a fall prevention device can be set without raising the work table high.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention regulates the opening and closing of a scissors link mechanism for elevating and lowering a workbench to prevent a fall of the workbench. In a work place vehicle, a base of a multi-stage telescopic pipe is rotatably provided on a connecting rod traversed between left and right links of the scissors link mechanism, and a vertical direction of the connecting rod is provided at a tip of the pipe. Provide a receiving part for the connecting rod located either above or below, and provide a stopper to regulate the expansion and contraction of the pipe, make the pipe vertical, regulate the expansion and contraction of the pipe with the stopper, and By supporting the connecting rod located, the pipe becomes a bar between the upper and lower connecting rods, preventing the work table from falling. Can be prevented from falling workbench at a position lower workbench if Chijimere.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. An aerial work vehicle 1 includes a crawler-type lower traveling body 2.
The scissors link mechanism 3 provided on the upper surface of the
The workbench 5 is opened and closed by the expansion and contraction of the work table 5.

In this embodiment, the scissor link mechanism 3 is composed of a lower link 31 and an upper link 32. The lower link 31 includes a pair of left and right fixed links 31a and a pair of left and right movable links 31b. X at the center of
The fixed link 31a has a lower end fixed to the crawler-type lower traveling body 2, and a movable link 31b has a lower end slidably provided on the crawler-type lower traveling body 2.

The upper link 32 connects a pair of left and right fixed links 32a and a pair of left and right movable links 32b in an X-shape at their respective central portions, and the lower end of the fixed link 32a is a fixed link of the lower link 31. The movable link 32 b is connected to the upper end of the movable link 31 b of the lower link 31 and connected to the upper end of the movable link 31 b of the lower link 31 so that the upper end is slidable on the work table 5.

A connecting rod 31c is provided between the bases of the left and right movable links 31b, 31b of the lower link 31. The connecting rod 31c is connected between the fixed links 32a, 32a of the upper link 32 above the connecting rod 31c. The rod 32c is suspended.

The connecting rod 31c of the lower link 31 includes
A fall prevention device 6 for preventing the work table 5 from falling is provided. The fall prevention device 6 is a telescopic pipe composed of a rectangular outer pipe 61 and an inner pipe 62 provided to be slidable in the outer pipe 61 in the axial direction of the outer pipe 61. Is provided rotatably on the connecting rod 31c, and the upper link 32
The receiving portion 62a of the connecting rod 32c is provided.

An upper pin 6 is provided near the upper end of the outer pipe 61.
3 and the insertion holes 61b and 61c of the lower pin 64 are formed,
Also, insertion holes 62b and 62c for the upper pin 63 and the lower pin 64 are formed in the upper part of the inner pipe 62, and insertion holes 62d and 62e for the lower pin 64 in the lower part of the inner pipe 62. Have been.

As a result, the inner pipe 62 is contracted, and the upper pin 63 and the lower pin 64 are inserted into the insertion holes 61b of the outer pipe 61.
If the inner pipe 62 is inserted into the insertion holes 62b and 62c in the upper part of the inner pipe 62 and the inner pipe 62, the sliding of the inner pipe 62 is restricted in a contracted state. In addition, the inner pipe 62 is extended to
And the lower pin 64 into the insertion holes 61b and 61c of the outer pipe 61.
When the inner pipe 62 is inserted into the insertion holes 62d and 62e below the inner pipe 62, the slide of the inner pipe 62 is regulated in an extended state.

For this reason, as shown in FIG. 1, the scissors link mechanism 3 is closed, the work table 5 is raised, the outer pipe 61 is turned upright, the inner pipe 62 is extended, and the upper pin 63 and the lower pin 63 are extended. Insert the pin 64 into the insertion hole 61 of the outer pipe 61.
b, 61c and insertion holes 62d, 62 below the inner pipe 62.
e, the workbench 5 is lowered slightly to support the connecting rod 32c of the upper link 32 on the receiving portion 62a of the inner pipe 62, and the upper pin 63 and the lower pin 64 act as stoppers to stop the inner pipe 62. Since the reduction is restricted, the worktable 5 is restricted from descending at a high position, and even if there is an unexpected accident during the work, the worktable 5 can be prevented from dropping.

Further, as shown in FIG.
2 is restricted, the upper pin 63 and the lower pin 64 restrict the reduction of the inner pipe 62, and
If the connecting rod 32c of the upper link 32 is supported by 2a, the lowering of the worktable 5 is restricted at a low position, so that the worktable 5 can be prevented from dropping even if an unexpected accident occurs during the work.

Therefore, the fall prevention device 6 can be set without raising the work table 5 high, and the maintenance work can be performed safely. Further, as shown in FIG. 4, the fall prevention device 6 comprises a bracket 31d provided on the outer pipe 61 and a bar 31d provided on the left and right movable links 31b, 31b.
Stored by screws.

FIG. 6 shows that the base 61a of the outer pipe 61 of the fall prevention device 6 is rotatably provided on the connecting rod 32c of the upper link 32, and the connecting rod 31c of the lower link 31 is connected to the receiving part 62a at the tip of the inner pipe 62. This shows a second embodiment of the present invention in which the fall prevention device 6 is held vertically by its own weight, so that the fall prevention device 6 can be set to an approximate position without being supported by a hand when setting the fall prevention device 6. Good workability.

In each of the above embodiments, the scissors link mechanism 3 having a two-stage structure and the fall prevention device 6 which expands and contracts in two stages have been described, but the present invention is not limited to this.

[0021]

As described above, in the aerial work vehicle of the present invention, a multi-stage telescopic pipe is provided on a connecting rod which is suspended between left and right links of a scissor link mechanism for moving up and down a work table. The base is provided rotatably, and the receiving end of the connecting rod located vertically above or below the connecting rod is provided at the tip of the pipe, and a stopper for restricting the expansion and contraction of the pipe is provided. By restricting the expansion and contraction of the pipe with the stopper, and supporting the connecting rod located at the top or bottom with the receiving part at the tip, the pipe becomes a bar between the upper and lower connecting rods, preventing the work table from falling Therefore, it is possible to prevent the work table from falling at a position where the work table is raised when the pipe is extended, and at a position where the work table is lowered when the pipe is contracted. Further, since the load applied to the pipe is constant irrespective of the height of the work table, it is efficient for pipe design and the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of an aerial work vehicle in which a fall prevention device according to a first embodiment is extended and a work table is supported at a high position.

FIG. 2 is a perspective view of an aerial work vehicle in which a fall prevention device is contracted and a work table is supported at a low position.

FIG. 3 is a perspective view of an aerial work vehicle.

FIG. 4 is a perspective view of an aerial work vehicle in which the fall prevention device is stored.

FIG. 5 is a perspective view showing details of a stopper of the fall prevention device.

FIG. 6 is a perspective view of a fall prevention device according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High work vehicle, 2 ... Lower traveling body, 3 ... Scissor link mechanism, 4 ... Hydraulic cylinder, 5 ... Work table, 6 ... Fall prevention device, 31 ... Lower link, 31a ... Fixed link, 31b ...
Movable link, 31c: connecting rod, 32: upper link,
32a: fixed link, 32b: movable link, 32c: connecting rod, 61: outer pipe, 61a: base of outer pipe,
62: inner pipe, 62a: receiving portion, 63: upper pin, 6
4 ... Lower pin

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66F 9/00-11/04

Claims (1)

(57) [Claims] An aerial work vehicle provided with a fall prevention device for restricting opening and closing of a scissors link mechanism for raising and lowering a work table to prevent the work table from dropping, wherein a lateral movement is provided between left and right links of the scissor link mechanism. The connecting rod to be bridged is provided with a rotatable base of a plurality of expandable and contractible pipes, and at the tip of the pipe is provided a receiving part for the connecting rod located vertically above or below the connecting rod, and An aerial work vehicle characterized by having a stopper for restricting expansion and contraction of the vehicle.