JPH0676290U - Work platform storage and holding mechanism for aerial work platforms - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a workbench storage / holding mechanism for an aerial work vehicle that can firmly hold the workbench in the storage position even when the workbench is stored and the work vehicle is run. [Structure] The worm 32, which is a worm gear for rotating the workbench 11, is right-handed when the workbench 11 is rotated to the left with respect to the boom 16 to be stored therein. Left-handed screws are used for turning and storing. As a result, the workbench 11 is swung to the stowed position, placed on the stowage space 18 of the vehicle body 17, and the boom 1
6 is stored, the workbench 11 is held in the storage position, and the workbench 11 does not rotate due to the vibration of the work vehicle 1 during traveling, so that the workbench 11 does not project from the vehicle body 17 to work on obstacles. The table 11 is not brought into contact with and damaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an aerial work vehicle having a swingable work platform at the tip of a boom, and moreover, a work platform storage of a work platform capable of holding the work platform in a predetermined storage position. Regarding the mechanism.

[0002]

[Prior art]

 In an aerial work vehicle in which a boom that can be expanded and contracted and raised and lowered is installed on the vehicle body, and a work platform is installed at the tip of this boom, the work platform can be operated at any time by elevating and extending the boom during work. Move to the position to work. In order to improve workability, the workbench has a mechanism that turns to the left and right. When the work is not performed, the boom is laid down and retracted and stored together with the workbench on the vehicle body.

Here, in such a conventional aerial work vehicle, a boom is disposed on the vehicle body so as to be capable of turning and undulating freely, and a vertical end that is always held vertically by a leveling mechanism is provided at the tip of the boom. A post is provided. A workbench mounting bracket, to which a workbench is attached, is pivotally attached to the vertical post so that the workbench can be freely swiveled around the vertical post. This swivel consists of a worm that is rotatably driven by a hydraulic or electric drive motor provided on the workbench mounting bracket at the pivot of the vertical post and the workbench mounting bracket, and a worm wheel provided on the vertical post. This is done by the movement of the worm gear. In addition, when retracting the boom, retract the boom and lower it while turning the workbench to the retracted position (the position where the workbench fits on the vehicle when the boom is retracted on the vehicle body), and place it in the workbench storage space on the vehicle body. This is done by placing a workbench.

[0004]

[Problems to be solved by the device]

 In such an aerial work vehicle, the workbench is held in the retracted position by the resistance of the worm gear for turning the workbench. The worm in this worm gear is often a right-hand screw (a screw having a thread that moves forward when the male screw is turned clockwise), which is a general screw. In addition, depending on the structure of the aerial work vehicle, there are some aerial work vehicles that require the work platform to turn right with respect to the boom to retract the boom when viewed from above. In such a vehicle, when the work vehicle travels with the boom retracted, the work platform vibrates up and down due to the vibration of the vehicle body during travel, so the work platform's own weight when the work platform descends. As a result, a force acts in the direction in which the worm meshing with the worm wheel provided on the vertical post rotates to the right. Here, when the worm rotates to the right, the workbench rotates to the left with respect to the boom, and the workbench may protrude from the storage space of the vehicle body on which it is placed.

In this case, in an aerial work vehicle of the type in which the base end portion of the boom is arranged in the front portion of the vehicle body, the boom is laid down behind the vehicle body, and the workbench is placed on the rear portion of the vehicle body. Booms are often retracted like In such an aerial work vehicle, when the retracted work platform turns and protrudes to the rear of the vehicle body, it is difficult for the driver to confirm this protrusion. There is a problem that the work table may come into contact with an obstacle and damage it.

The present invention has been made in view of such a problem, and it is possible to firmly hold the workbench in the storage position even when the work vehicle travels in a state where the workbench is stored. An object is to provide a workbench storage / holding mechanism for an aerial work vehicle.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the workbench storage and retention mechanism of the present invention, a workbench is pivotally attached to a vertical post at the tip of a boom and meshes with a worm wheel provided on the vertical post. The workbench is equipped with a drive means for rotating the worm. If the workbench is held in the retracted position by the resistance of the worm gear and the workbench is rotated to the left and stored, the worm should be screwed to the right and the workbench to the right. When swiveling and storing, the worm has a left-hand thread.

[0008]

[Action]

 In the workbench storage / holding mechanism of aerial work vehicles equipped with such a mechanism, when the boom with the workbench installed at the front end is retracted, the workbench is swung to the storage position and stored in the storage space of the vehicle body. The workbench is held in the stored state. When the workbench moves up and down due to vibration, the worm for turning the workbench rotates in the direction in which the workbench is retracted.Therefore, even when the workbench is traveling with the boom retracted, the workbench protrudes from the vehicle body. There is no turning in the direction of.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, an aerial work vehicle equipped with a workbench storage / holding mechanism according to the present invention will be described with reference to FIG. In the aerial work vehicle 1, a swivel base 20 is provided at the front of the vehicle body 17 so as to be freely swivelable with respect to the vehicle body 17. The base end of the boom 16 is pivotally attached to the upper part of the swivel base 20. The boom 16 is composed of three stages of boom members and is telescopically (nestedly) telescopically configured. is there.

A vertical post 13 that is always held vertically by a leveling mechanism (not shown) is provided at the tip of the boom 16. A workbench mounting bracket 12 is pivotally attached to the vertical post 13 so that the workbench 11 can be freely swiveled around the vertical post 13 because the workbench 11 is attached to the workbench mounting bracket 12. can do. This turning is performed at a pivotal portion of the vertical post 13 and the workbench mounting bracket 12 by a worm 32 driven by a hydraulic or electric drive motor provided on the workbench mounting bracket 12 and a wort provided on the vertical post. This is performed by the movement of the wheel 33.

Next, the workbench storage / holding mechanism according to the present invention will be described with reference to FIGS. 2 and 3. A pair of workbench mounting brackets 12a and 12b of the workbench 11 are rotatably mounted on the vertical post 13 provided at the tip of the boom 16 via journal bearings (not shown). As a result, the workbench 11 is supported by the vertical post 13 so as to be horizontally rotatable. In this way, the swivel driving means 30 for swiveling and driving the work table 11 which is swivelly attached to the vertical post 13 is provided. The turning drive means 30 is composed of a drive motor 31 attached to the upper bracket 12a, a worm 32 rotatably driven by the drive motor 31, and a worm wheel 33 fixed to the vertical post 13. The worm 32 and the worm wheel 33 mesh with each other.

When the drive motor 31 drives the worm 32 to rotate, the worm 32 rotates while meshing with the worm wheel 33 fixed to the vertical post 13 and rotates around the worm wheel 33. Is driven to rotate horizontally around the vertical post 13. In order to prevent interference between the workbench 11 and the boom 16 during turning, stoppers (not shown) are provided at the left and right turning limit points (points at which the workbench and boom interfere with each other when turning further). Has been.

The worm 32 has a tooth surface shape as shown in FIG. 3, and is configured as a so-called left-hand screw (a screw having a screw thread that advances when the screw is turned counterclockwise). As a result, when the worm 32 is rotated clockwise by the drive motor 31, it engages with the worm wheel 33 at the point A on its tooth surface 32a and rotates right around the worm wheel 33. Therefore, the workbench 11 provided with the worm 32 turns to the right with respect to the vertical post 13 provided with the worm wheel 33 (turns right when viewed from the upper surface of the aerial work vehicle 1), and thus the workbench 11 is retracted. It will turn in the direction.

Here, as shown in FIG. 1, the workbench 11 is turned to the right with respect to the boom 16 until it comes into contact with the right stopper, and is placed in the storage space 18 on the vehicle body 17 to lift the work platform for aerial work. When 1 is run, the work table 7 vibrates up and down due to the vibration during running. Therefore, the meshing point between the worm 32 and the worm wheel 33 moves from A to B and C as shown in FIG. In this case, since there is backlash between the worm 32 and the worm wheel 33, even if the meshing point A moves to C when the workbench 11 moves upward, no force is exerted on the worm 32 and the worm wheel 33. It has no effect.

When the workbench 11 that has moved upward moves downward, the meshing point A moves to B. In this case, the workbench 11 is subjected to its own weight along the tooth surface 32a, and the worm warms. A force for rotating the 32 to the right acts. Here, when the worm 32 rotates to the right, a force is exerted on the workbench 11 in the direction in which it abuts against the stopper for stopping the turn at the turning limit point on the right side. Can be held firmly.

In the above embodiment, the case where the workbench is swung to the right with respect to the boom and stored is described. However, when the workbench is swung to the left with respect to the boom and stored, By using a right-hand thread for the worm, the storage position of the workbench in the vehicle body can be maintained.

[0017]

[Effect of device]

 As described above, in the workbench storage / holding mechanism for an aerial work vehicle according to the present invention, when the worm of the worm gear that rotates the workbench is stored by turning the workbench counterclockwise to the boom. Is a right-hand screw, and the left-hand screw is used when the workbench is rotated to the right and stored. As a result, when the workbench is swung to the storage position and placed in the storage space of the vehicle body to store the boom, the workbench is held in the storage position, and the workbench swings due to the vibration during traveling of the work vehicle. Since the workbench does not protrude from the vehicle body, the workbench will not come into contact with any obstacle and be damaged.

[Brief description of drawings]

FIG. 1 is a perspective view of an aerial work vehicle including a workbench storage / holding mechanism according to the present invention.

FIG. 2 is a side view of the workbench.

FIG. 3 is a side view of a worm used in the workbench storage holding mechanism.

[Explanation of symbols]

 11 Workbench 13 Vertical Post 16 Boom 17 Body 32 Worm 33 Worm Wheel

Claims (1)

[Scope of utility model registration request] 1. A boom which is arranged on the vehicle body so that it can be freely actuated such as ups and downs, a vertical post provided at the tip of the boom, and a work table which is pivotably attached to the vertical post, The vertical post includes a worm wheel, a worm that meshes with the worm wheel, and a drive unit that is provided on the workbench and rotationally drives the worm. By rotationally driving the drive unit, A workbench of an aerial work vehicle that holds the workbench storage position by the resistance of a worm gear composed of the worm wheel and the worm when the workbench is rotated to the storage position and the drive means is stopped. A storage and holding mechanism, wherein when the workbench is rotated to the left with respect to the boom to be stored, the worm is a right-hand screw and the workbench is When said store by the right turning relative to the boom, workbench store holding mechanism aerial platforms, characterized by said worm and left-hand thread.