JP2000153995A - Horizontally levelling device for high-place working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily make initial horizontal levelling of a working table after assembled. SOLUTION: A levelling device horizontally levels working table 4 to be mounted on an elevator via a jib mechanism 5. The working table 4 is mounted to a working table bracket 11 to be elevated by the elevator via a mounting pin 13 for rotational movement about a horizontal axis. An adjustment threaded shaft 14 is provided under the mounting pin 13 for connecting the working table 4 to the working table bracket 11. A connection space is changed by the adjustment threaded shaft 14 for adjusting the mounting angle of the working table 4 to the working table bracket 11.

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 mainly used for indoor aerial works, such as a work of replacing a fluorescent lamp arranged on a ceiling and a work of attaching various devices to the ceiling. More particularly, the present invention relates to a horizontal adjustment device capable of adjusting a mounting angle of a worktable.

[0002]

2. Description of the Related Art Conventionally, there are hydraulic and mechanical leveling devices for leveling a workbench of an aerial work platform, and a large aerial work vehicle used for outdoor aerial work is used. Employs a hydraulic leveling device, and in the case of a small aerial work vehicle used for indoor aerial work, a mechanical leveling device is employed. The hydraulic leveling device is provided with a hydraulic level cylinder between a boom that moves up and down and a work table attached to the end of the boom, and controls the level cylinder in relation to the raising and lowering operation of the boom. It is configured to automatically adjust the level of the worktable. On the other hand, the mechanical leveling device is configured such that the workbench can be moved up and down while always maintaining the parallel state by configuring the workbench elevating device with a parallel link mechanism.

[0003]

However, the work table at the time of assembly may not be horizontal due to processing errors and the like. Therefore, it is common to require horizontal adjustment (initial leveling) after assembly. For this reason, in the case of the hydraulic leveling device, the initial level of the workbench is adjusted by operating the level cylinder adjusting valve provided in the hydraulic circuit for driving the level cylinder to adjust the increase or decrease of the pressure oil with respect to the level cylinder. This method has an advantage that accurate leveling can be easily performed, but has a problem in that it is expensive. On the other hand, in the case of a mechanical leveling device comprising a parallel link mechanism, as a final step at the time of assembling, the initial leveling is performed by currently welding the work table bracket and the link arm mounting bracket, According to this, although it has the advantage of being inexpensive compared to a hydraulic leveling device, it is technically cumbersome to weld the brackets so that the horizontal attitude of the worktable can be obtained, and it is difficult to make fine adjustments. Therefore, there is a problem in that productivity is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make it possible to easily perform initial leveling of a worktable after assembling the worktable. It is an object of the present invention to provide a high level work vehicle leveling device.

[0005]

To achieve the above object, the present invention is configured as follows. That is, the invention of claim 1 is a level adjusting device for an aerial work vehicle for adjusting the level of a work table attached to a lifting device, wherein the work table is mounted on a work table bracket that is raised and lowered by the lifting device. The work table is provided so as to be rotatable about a horizontal axis, and is provided with a manually operated level adjusting means which can be adjusted to a horizontal state by rotating the work table and can be fixed at the adjusted position.

According to the first aspect of the present invention, after the work table is assembled, the work table is rotated by manually operating the horizontal adjustment means, and the work table is rotated with respect to the work table bracket. After adjusting the mounting angle, it can be fixed at the adjusted position. That is, after the work table is assembled, the work table can be easily leveled out by performing the above operation.

According to a second aspect of the present invention, in the level adjusting device for an aerial work vehicle according to the first aspect, the level adjusting means connects the operating table and the operating table bracket at a position distant from the rotation fulcrum of the operating table. It is constituted by an adjusting screw shaft to be connected, and at least one end of the adjusting screw shaft is connected to either the worktable or the worktable bracket by a nut so that the connection interval can be adjusted. According to the second aspect of the present invention, by rotating the nut to adjust the connection interval between the worktable and the worktable bracket by the adjusting screw shaft, the same as in the first aspect of the present invention. After the work table is assembled, the work table can be easily leveled out.

According to a third aspect of the present invention, there is provided a level adjusting device for an aerial work platform for adjusting the level of a work table, wherein the work table is attached via a parallel link mechanism so as to be tiltable in a vertical direction. One side arm of the parallel link mechanism is provided with a turnbuckle for adjusting the arm length.

According to the third aspect of the present invention, the angle at which the workbench is attached to the parallel link mechanism is changed by operating the turnbuckle to change the arm length of one side of the parallel link mechanism. Can be.
That is, after the work table is assembled, the work table can be easily leveled by operating the turnbuckle.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing an aerial work vehicle according to the present embodiment, FIG. 2 is a side view of a work table, FIG. 3 is a plan view of the work table, and FIG. 4 is an enlarged side view showing horizontal adjustment means of the work table. . The arrow “front” in the figure indicates the front of the vehicle.
As shown in FIG. 1 and FIG. 2, the aerial work vehicle includes a traveling and steerable vehicle body 1 having a front wheel 1 a and a rear wheel 1 b. 3
Are provided so as to be horizontally rotatable. Although not shown, the vehicle body 1 is configured to travel by driving a traveling hydraulic motor and to be steered by operation of a hydraulic steering cylinder. It is configured to be turned through a gear drive device.

On the swivel 3, from the rear side to the front side,
A mast telescopic lifting device 6 for raising and lowering the work table 4 using the hydraulic lift cylinder 6a as a drive device, a battery storage box 8 for storing a battery 7, and a weight balance against a load acting on the work table 4 Are arranged side by side in the above order. The work table 4 is disposed behind the lifting device 6 and is attached to the lifting device 6 via a jib mechanism 5 that can be tilted up and down. Therefore, the work table 4 is configured to be moved up and down by two kinds of operations, namely, a vertical elevating operation by the extension and contraction operation of the mast, and a vertical tilting operation by the jib mechanism 5.

The jib mechanism 5 comprises a parallel link mechanism comprising a jib arm 5a and a pair of left and right sub-arms 5b, and a hydraulic jib cylinder 5c for tilting the same. Therefore, the worktable 4 is always raised and lowered in parallel regardless of the tilt angle of the jib mechanism 5. The protective fence 4a of the worktable 4 has a jib mechanism for running the vehicle, steering and turning the turntable 3, extending and retracting the elevating device 6, and a jib mechanism that can be operated by an operator who gets on the worktable 4. An operation member 4b including a tilting lever, a handle, and the like 5 and an operation panel 4c provided with various instruments are provided. The aerial work vehicle configured as described above is configured such that a worker gets on the work table 4 and performs an ascent / descent operation by the jib mechanism 5 and the elevating device 6 and a turning operation of the swivel table 3 in an appropriate combination. The table 4 can be moved up and down and sideways and used for indoor high-altitude work.

Next, a horizontal adjustment device for adjusting the level of the work table 6 will be described with reference to FIGS. As shown,
A worktable bracket 11 for supporting the worktable 4 has an upper and lower part rotatably connected to ends of a jib arm 5a and a sub arm 5b constituting the jib mechanism 5 by pins 11a and 11b, and a parallel link mechanism. Constitutes one link. On the other hand, the worktable 4 has projections 12 on the left and right sides on the lower part of the front surface, and both projections 12 are attached to the upper end of the worktable bracket 11 by a mounting pin 13 so as to be rotatable around a horizontal axis. Accordingly, a moment in the backward tilt direction (counterclockwise in FIG. 2) always acts.
The work table 4 is supported below the center of rotation by two adjusting screw shafts 14 connecting the work table 4 and the work table bracket 11 on the left and right sides so as to receive (stretch) the moment.

That is, the adjusting screw shaft 14 connects and fixes the lower end of the front surface of the worktable 4 and the lower end of the worktable bracket 11 so that the connection distance L can be adjusted. This constitutes a manually operated horizontal adjustment means for adjusting the (mounting angle). The adjusting screw shaft 14 is provided at one end with a connecting portion 17 having a vertically long slot 17a which engages with an engaging pin 16 provided on the lower side surface of the frame 15 of the worktable 4, and the other end is provided on the worktable bracket 11. It is fastened with a double nut 18 while penetrating the mounting hole.

[0015] The horizontal adjustment device for an aerial work vehicle according to the present embodiment is configured as described above. Therefore, FIG.
As shown in FIG. 6, when the nut 18 of the left and right adjustment screw shafts 14 is rotated to change the connection distance L between the work table 4 and the work table bracket 11 by the adjustment screw shaft 14, the work table 4 becomes By turning clockwise or counterclockwise around the mounting pin 13 with respect to the bracket 11, the mounting angle with respect to the worktable bracket 11 is adjusted. In this case, the engagement pin 16
Is displaced in the vertical direction by the rotation of the work table 4, and the displacement is caused by the vertically elongated slot
It is absorbed by moving inside 7a. As described above, according to the present embodiment, after the work table 4 is assembled, the initial leveling of the work table 4 can be easily performed by performing the above operation on the left and right adjustment screw shafts 14.

After the adjustment, the adjustment screw shaft 14 is fastened to the worktable bracket 11 by the nut 18 so that the worktable 4 is fixed to the work bracket 11 by the left and right mounting pins 13 and the left and right adjustment screw shafts 14. It can be fixed in a stable state at four places. The work table 4 is basically assembled so as to be in a horizontal state. However, depending on the work, there is a case where the work table 4 is desired to be used in an inclined state. According to the present embodiment, such a case can be easily dealt with.

Next, another embodiment of the horizontal adjustment device of the present invention will be described with reference to FIG. In this embodiment, the mounting angle of the worktable 4 with respect to the jib mechanism 5 can be adjusted by changing the length of one arm of the parallel link mechanism constituting the jib mechanism 5. That is, the length of the sub-arm 5b is adjustable by dividing the left and right sub-arms 5b in the middle of the length direction and connecting them by the turnbuckle 19.
In this case, the worktable 4 is fixed to the worktable bracket 11 by bolts or welding. Therefore, in the case of this embodiment, the turning angle of the turnbuckle 19 after assembling the worktable 4 adjusts the mounting angle of the worktable 4 to the jib mechanism 5 in the same manner as in the above-described embodiment. Leveling can be easily performed.

The present invention is not limited to the illustrated embodiment, but can be appropriately changed without departing from the spirit of the present invention. For example, in an embodiment in which the adjusting screw shaft 14 is used as the horizontal adjusting device, the positional relationship between the mounting pin 13 and the adjusting screw shaft 14 may be set upside down, and the adjusting screw shaft 14 may be located at the center of one. There may be. In addition, as an elevating device for elevating and lowering the work table 4,
The case where the mast telescopic lifting device 6 and the jib mechanism 5 are used together has been described. Further, the present invention may be applied to an aerial work vehicle having no swivel 3.

[0019]

As described in detail above, according to the present invention,
In an aerial work vehicle, when the work table after assembly is not horizontal due to a processing error or the like, the work table can be leveled out by a simple operation.

[Brief description of the drawings]

FIG. 1 is a side view showing an aerial work vehicle according to an embodiment.

FIG. 2 is a side view of a work table.

FIG. 3 is a plan view of the same.

FIG. 4 is an enlarged side view showing a horizontal adjusting means of the work table.

FIG. 5 is a side view of a horizontal adjustment unit according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body 3 ... Revolving table 4 ... Work table 5 ... Jib mechanism 6 ... Mast telescopic type elevating device 11 ... Work table bracket 13 ... Mounting pin 14 ... Adjustment screw shaft 16 ... Engagement pin 17 ... Connection part 18 ... Nut

Claims (3)

[Claims] 1. A level adjusting device for an aerial work platform for adjusting the level of a work table attached to an elevating device, wherein the work table is mounted on a work table bracket which is raised and lowered by the elevating device around a horizontal axis. A leveling device for a high work vehicle, comprising a manually operable leveling means that is rotatably mounted, and is adjusted to a horizontal state by rotating the worktable and can be fixed at the adjusted position. 2. The level adjusting device for an aerial work vehicle according to claim 1, wherein the level adjusting means connects the work table and the work table bracket at a position distant from a rotation fulcrum of the work table. A level adjusting device for an aerial work vehicle, wherein at least one end of the adjusting screw shaft is connected to one of the work table and the work table bracket by a nut so that a connection interval can be adjusted. 3. A level adjusting device for an aerial work platform for adjusting the level of a work table, wherein the work table is attached via a parallel link mechanism so as to be tiltable in a vertical direction, and the parallel link mechanism is attached to the work table. A horizontal adjustment device for aerial work vehicles that has a turnbuckle for adjusting the arm length on one side of the arm.