JPH0644956Y2 - Work platform turning device for aerial work platforms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a workbench turning device for an aerial work vehicle in which a workbench turns about a rotation axis.

[Prior art]

As shown in FIG. 3, a work platform swinging device for a work platform mounted on the tip of a boom of a conventional work platform for swinging a work platform in a predetermined direction swings at the tip of a boom 11. After inserting the thrust washer 13 into the lowermost part of the outer periphery of the installed rotary shaft 12, the brackets 15a and 15b of the worktable 14 are provided above the thrust washer 13 (the worm wheel 16 is interposed between the brackets 15a and 15b). The worm wheel 16 and the rotary shaft 12 are firmly fixed, for example, by hitting a knock pin 17, and then a fixing nut 18 or the like is screwed from above the rotary shaft 12. The workbench 14 is sandwiched between the brackets 15a and 15b, and a worm gear 19 that is finally rotated by a drive mechanism (hydraulic motor, etc., not shown in the figure) mounted on the workbench 14 is meshed with the worm wheel 16. Of There in reality.

[Problems to be solved by the device]

However, in the conventional work platform turning device for an aerial work vehicle employing the above structure, the thrust washer 13 is inserted into the lowermost part of the outer periphery of the rotating shaft 12 erected at the tip of the boom 11, and then the rotating shaft 12 is rotated. On the other hand, when interposing the worm wheel 16, the brackets 15a and 15b of the workbench 14 must be inserted at the same time, so the assembling work is very complicated, and the worm wheel 16 and the rotary shaft 12 that have been inserted are very complicated.
Since the fixing of the worm wheel 16 is performed by driving the knock pin 17, etc., there is a problem that the worm wheel 16 is not firmly fixed to the rotating shaft 12, the number of parts is large, the cost is increased, and maintenance etc. Had various problems such as being extremely difficult.

[Means for Solving the Purpose and Problem of Invention]

The present invention has been made in view of the problems described above, and an object thereof is to provide a workbench turning device for an aerial work vehicle in which the workbench turns about a rotation axis. Therefore, in a workbench turning device for an aerial work vehicle in which the workbench turns about a rotating shaft, a worm wheel is attached to the outer periphery of the rotating shaft, and a worm gear mounted on the working table is meshed with the worm wheel. To freely rotate the bracket attached to the workbench,
Further, the worm wheel is configured to be attached to the rotary shaft so as to come into contact with the upper surface of the worm wheel.

[Action]

Since the above-mentioned configuration is adopted, the workbench is attached to the rotating shaft by first attaching the worm wheel to the rotating shaft, engaging the worm gear equipped on the workbench with the worm wheel, and attaching the bracket attached to the workbench to the above. Since it is performed by contacting the upper surface of the worm wheel, the workbench mounting work can be performed very easily.

〔Example〕

Hereinafter, one embodiment of a work platform turning device for an aerial work vehicle according to the present invention will be described in detail with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a boom which can be raised, retracted and swiveled by pivotally supporting a base end of a turntable mounted on an aerial work vehicle (not shown). Is erected.

A flange 2a (base plate) is provided so as to project slightly below the center of the rotary shaft 2, and a worm wheel 3 is inserted from above on the upper surface of the flange 2a. The worm wheel 3 is located below the lower surface of the flange 2a. It is firmly fixed by a plurality of screws 2b to be inserted and integrated with the rotary shaft 2.

Then, the worm wheel 3 fixed to the rotating shaft 2
A worm gear 5 mounted on the workbench 4 is meshed with the upper surface of the above, and a bracket 4a attached to the workbench 4 is rotatably abutted and arranged.

Reference numeral 6 denotes a hydraulic motor attached to one side surface of the bracket 4a for rotating the worm gear 5. The hydraulic motor 6 is driven to rotate the worm gear 5 so that the workbench 4 can be swung in a horizontal plane. Is configured.

Hereinafter, the operation of the workbench turning device for an aerial work vehicle according to the present invention will be described based on the above configuration.

The swinging movement of the work table 4 in the horizontal plane by the work table turning device for an aerial work vehicle according to the present invention drives the hydraulic motor 6 arranged on one side of the bracket 4a attached to the work table 4,
It is performed by rotating a worm gear 5 meshed with a worm wheel 3 fixed to the rotary shaft 2.

Since the worm wheel 3 is firmly fixed to the rotary shaft 2, the worm gear 5 meshing with the worm wheel 3 rotates left and right in accordance with rotation (forward rotation or reverse rotation), and work to equip the worm gear 5 The table 4 swings right and left in the horizontal plane about the rotation axis 2.

By the way, the mounting of the worm wheel 3 on the rotary shaft 2 is carried out by inserting the worm wheel 3 into the upper surface of the flange 2a of the rotary shaft 2 and fixing it with the screw 2b penetrating the flange 2a. Is very easy and the number of parts is only the worm wheel 3, so the cost is also low, and the fixing of the worm wheel 3 also fixes the plurality of screws 2b screwed to the flange 2a as compared with the conventional fixing method using a knock pin. Since it is fixed with, the fixed state is very strong.

[Effect of device]

As described in detail above, the present invention relates to a workbench turning device for an aerial work vehicle in which a workbench turns about a rotation axis, and a worm wheel is attached to the outer circumference of the rotation axis.
Since the worm gear mounted on the workbench is meshed with the worm wheel and the bracket attached to the workbench is rotatably attached to the rotary shaft so as to abut the upper surface of the worm wheel, the rotary shaft The workbench is attached to the worm by first attaching a worm wheel to the rotary shaft, engaging the worm gear equipped on the workbench with the worm wheel, and abutting the bracket attached to the workbench on the upper surface of the worm wheel. Therefore, the number of parts required for the mounting is small, and accordingly, the assembling work is easy and the cost is low. Further, it has various excellent effects such as that maintenance is extremely easy.

[Brief description of drawings]

1 and 2 show an example of a workbench turning apparatus for an aerial work vehicle according to the present invention. FIG. 1 is a side view disclosing the essential parts, and FIG. 2 is the disclosing the same essential parts. FIG. 3 is a perspective view showing a structure of a workbench rotating shaft of a conventional work vehicle for aerial work. 1 ... Boom, 2 ... Rotation axis, 2a ... Flange, 2b ...
Screw, 3 ... Worm wheel, 4 ... Workbench, 4a ...
Bracket, 5 ... Worm gear, 6 ... Hydraulic motor.

Claims (1)

[Scope of utility model registration request] 1. A workbench turning device for an aerial work vehicle in which a workbench turns about a rotation axis, and a worm wheel is attached to the outer periphery of the rotation axis, and the worm gear mounted on the workbench is attached to the worm wheel. And a bracket attached to the workbench is rotatably attached to the rotary shaft so as to abut the upper surface of the worm wheel.