JPH0333753Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field The present invention relates to a lifting device for an aerial work vehicle in which only the lifting device is selectively rotated automatically or manually.

(2) Prior Art It is conventionally known to provide a work platform and a lifting device at the tip of a boom so that they can each rotate in a horizontal plane, as described in, for example, Japanese Patent Application Laid-Open No. 56-3289.

(3) Problems that the invention aims to solve However, the conventional lifting device for aerial work vehicles is
The lifting device must be rotated manually or the lifting device must be fixed to the workbench and the lifting device must be rotated as the workbench rotates, so it is not possible to automatically rotate the lifting device alone. However, there were problems in that it was inconvenient and had poor workability.

(4) Means for solving the problem In order to solve the above problem, the present invention has a post inner cylinder attached to the tip of the boom so that its axis is constantly controlled in the vertical direction. , a lifting post to which a lifting device is attached and fitted above the post inner cylinder so as to be rotatable in a horizontal plane;
A swing device that is rotatably fitted to the outer circumference of the lifting post and fixed to the inner tube of the post or the lifting post, and a fixing device that fixes and releases the swing device to the lifting post or the inner tube of the post. It is.

(5) Effect With the above configuration, when the lifting device is automatically rotated, the lifting device is fixed to the lifting post or the post inner cylinder using the fixing device, and the lifting device is driven in this state. rotates in a horizontal plane relative to the inner cylinder of the post, and the lifting device attached to the lifting post rotates. In addition, when manually rotating the lifting device, by releasing the fixing device and releasing the lifting post or post inner cylinder from the rotating device, the lifting post can be rotated freely regardless of the rotating device, and the lifting device can also be freely rotated. Turn around.

(6) Examples Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a detailed cross-sectional view of the main part, in which a post inner cylinder 2 is pivotally attached to the tip of the boom 1 so as to be able to swing in the vertical direction, and a bracket 4 is fixed to the lower end of the post inner cylinder 2. A balance-maintaining cylinder 5 is attached between the tip of the boom 1 and the balance-maintaining cylinder 5 to maintain the horizontal state of the workbench 6, and constantly controls the posture of the post inner cylinder 2 with its axis in the vertical direction.

A workbench support post 7 is rotatably fitted into the outer periphery of the post inner cylinder 2, and a lifting post 8 having a lifting device 13 attached to its upper end is rotatably fitted into the upper part of the post inner cylinder 2, for lifting. post 8
A spur gear 9 is fixedly and releasably fitted to the lifting post 8 by a fixing device 10 on the outer periphery of the spur gear 9. When the spur gear 9 is fixed to the lifting post 8, the spur gear 9
When the lifting post 8 turns as the lifting post 8 rotates and the spur gear 9 is released by the lifting post 8, the lifting post 8 becomes able to turn freely regardless of the rotation of the spur gear 9.

A turning device that automatically turns the lifting post 8 includes the spur gear 9, a pinion 11 that meshes with the spur gear 9, and a hydraulic motor 12 that drives the pinion 11.
The hydraulic motor 12 is comprised of a bracket 1
8 is fixed to the post inner cylinder 2.

As shown in FIGS. 3 and 4, the fixing device 10 includes a pin 21 that is slidably inserted into a cylindrical body 19 and is biased downwardly by a spring 20.
A cam body 22 is pivotally attached to the upper end of this pin 21, and an operating lever 23 is pivotally attached to this cam body 22. By tilting the operating lever 23, The pin 21 is pulled upward and the lifting post 8 and spur gear 9
By releasing the fixation with the pin 21 and standing the operating lever 23 vertically, the pin 21 descends and fixes the lifting post 8 and the spur gear 9.

A workbench 6 is fixed to the outer surface of the workbench support post 7 via a bracket 14, and between the side surface of the workbench 6 and the outer peripheral surface of the post inner cylinder 2, the workbench 6 can be swung in a horizontal plane. A swing cylinder 15 is fixed for movement.

The lifting device 13 is composed of a winch bracket 16 fixed to the upper part of the lifting post 8 with a pin, and a winch boom 17 whose length can be expanded and contracted by connecting the winch bracket 16 with a pin. .

With the above configuration, when the lifting device 13 is automatically rotated, the operating lever 23 of the fixing device 10 is set vertically as shown in FIG. When the pinion 11 is rotated by driving the hydraulic motor 12 in this state, the spur gear 9 that meshes with the pinion 11 rotates, and as the spur gear 9 rotates, the lifting post 8 moves inside the post. The lifting device 13 rotates in a horizontal plane relative to the cylinder 2.
Swirl.

Next, when the lifting device 13 is not in use or when the workbench 6 is to be rotated in a horizontal plane, the operating lever 2 of the fixing device 10 is rotated as shown in FIG.
By tilting the pin 21, the pin 21 is pulled upward to release the fixation between the spur gear 9 and the lifting post 8, and the lifting post 8 is held in a horizontal plane with respect to the post inner cylinder 2 regardless of whether the spur gear 9 rotates or stops. The lifting device 13 can be freely rotated manually within the lifting device.

In addition, in the above embodiment, the swivel device fixed to the inner cylinder of the post is fixed to and released from the lifting post by the fixing device. It is also possible to use a device that can be fixed to and released from the inner cylinder.Also, in the embodiment, a device consisting of a spur gear, a pinion, and a hydraulic motor is shown as a turning device that automatically turns the lifting post. Alternatively, a worm gear and worm wheel or a chain and sprocket are also possible.

(7) Effects of the invention As described above, according to the invention, only the lifting device can be selectively rotated automatically or manually with a simple structure, so that only the lifting device can be automatically turned when lifting a load. Provided is a lifting device for an aerial work vehicle that can prevent damage caused by contact between the workbench and the lifting device due to rotation of the workbench, and prevent a worker from being caught between the workbench and the lifting device. Therefore, the present invention is effective in improving the workability of aerial work vehicles.

[Brief explanation of the drawing]

The drawings show embodiments of the invention, and FIGS.
The figure is a detailed sectional view of the main part, and FIGS. 3 and 4 are explanatory views of the fixing device. 1... Boom, 2... Post inner cylinder, 8... Lifting post, 9... Spur gear, 10... Fixing device,
11...Pinion, 12...Hydraulic motor, 13...
...lifting equipment.

Claims (1)

[Scope of utility model registration request] A post inner cylinder is attached to the tip of the boom so that its axis is always vertically controlled, and a lifting post is fitted above the post inner cylinder to be rotatable in a horizontal plane to which a lifting device is attached. a rotating device rotatably fitted to the outer periphery of the lifting post and fixed to the post inner tube or the lifting post; and a fixing device for fixing and releasing the rotating device to the lifting post or the post inner tube. A lifting device for an aerial work vehicle, characterized by being equipped with.