JPH0738316Y2 - Boom tip structure of aerial work vehicle - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to an aerial work vehicle for performing aerial work such as electric work, and particularly, at the tip of a boom that can be raised and lowered on the aerial work vehicle. The present invention relates to a boom tip structure for an aerial work vehicle having a bucket for aerial work and a manipulator.

(Prior Art) In this type of aerial work vehicle, when the work carried out by the operator who has boarded the bucket is work by the manipulator, the manipulator is positioned in front of the bucket so that the worker can work from behind the manipulator. While monitoring the manipulator work, if the worker's work is manual work, the manipulator should be positioned behind the bucket to secure a working space for the worker and improve the work efficiency. There is.

Furthermore, when the work is manual work, it is necessary to bring the bucket as close as possible to the work site in order to maintain good work efficiency, and therefore the bucket moves independently of the manipulator as necessary. It is also necessary to be able to do it.

By the way, for example, at the tip of the boom A of a conventional aerial work vehicle as shown in FIG. 6, a bucket C and a manipulator mounting member D are independently pivotably mounted on a support shaft B. To change the positions of the bucket C and the manipulator E as described above in an aerial work vehicle, each of them is independently turned, or
Swing drive device for bucket C and manipulator mounting member D
By interposing special tuning means between the swivel drive device and the swivel drive device, the operations of both swivel drive devices are synchronized.

(Problems to be solved by the invention) When the operations of the two turning drive devices are synchronized in this way, the work of changing the positions of the bucket C and the manipulator E can be performed very easily, so that the work efficiency is improved. , It is necessary to install special tuning means, and the structure becomes complicated.

The present invention has been made under such circumstances, and by providing a simple structure in which the bucket C and the manipulator E are interlocked with each other, while maintaining good work efficiency at a high place, it is possible to obtain a special result. The purpose is to eliminate the means of tuning.

(Means for Solving the Problem) In order to achieve this object, the present invention is directed to a high place in which a bucket for mounting a worker and a manipulator operated from the bucket are attached to the tip of a boom that can be raised and lowered. In the boom tip structure of a work vehicle, a vertical support shaft is provided at the tip of the boom so as to always maintain a vertical posture regardless of the ups and downs of the boom, and the manipulator is attached to the vertical support shaft. Mounted on the base end of the manipulator mounting member mounted on the upper end of the base end of the manipulator mounting member, the bucket spindle being positioned substantially on the same axis as the axis of the vertical spindle. In addition, the bucket is supported via the bucket support shaft, and the bucket is configured to be rotatable around the bucket support shaft.

(Operation) According to the present invention, by rotating the manipulator mounting member around the vertical support shaft, the manipulator rotates, and at the same time, the bucket supporting shaft is erected on the upper surface of the base end portion of the manipulator mounting member. Since the bucket is supported via the shaft, the bucket supported on the bucket support shaft on the manipulator mounting member can also be swung.

Therefore, it is possible to change the relative position between the bucket and the manipulator as it is without installing a special tuning device as in the past, and to install the bucket spindle on the manipulator mounting member above the vertical spindle. Since it can be configured by supporting the bucket, the structure is relatively simple.

Furthermore, since the bucket can be swung around the bucket support shaft independently of the manipulator mounting member, the workability during manual work can be favorably maintained.

(Embodiment) The present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a boom of an aerial work vehicle, which is erected up and down on an aerial work vehicle (not shown) so as to be extendable and contractible.

A vertical support shaft 3 is attached to the tip of the boom 1 via a pivot 2.

In the vertical support shaft 3, a hydraulic cylinder 4 installed inside the tip of the boom 1 is controlled to expand and contract in accordance with the hoisting angle of the boom 1, and a piston rod 4a of the hydraulic cylinder 4 is located below the vertical support shaft 3. By being connected to the bracket 5 that is fixed to, the vertical posture is always maintained.

The base end portion of the manipulator mounting member 6 is mounted on the vertical support shaft 3 thus configured, and the manipulator 7 is mounted on the tip end portion of the manipulator mounting member 6.

The manipulator mounting member 6 requires the manipulator 7 to be brought close to the bucket 21 when the tool mounted on the tip of the manipulator 7 is attached or detached. Avoid interference between the base end and the mounting portion 21b of the bucket 21
The manipulator mounting member 6 is bent so that the tip end side thereof, that is, the base end side of the manipulator 7 is positioned high so that the manipulator 7 can sufficiently approach the close position.

Further, inside the base end portion of the manipulator mounting member 6, a first drive device 8 for driving the manipulator mounting member 6 to rotate around the vertical support shaft 3 is configured (see FIG. 2).

The first drive device 8 is composed of a worm wheel device, and is a wheel 11 fixed to the vertical support shaft 3 and a hydraulic motor as a drive source installed in the manipulator mounting member 6.
12 and a worm 13 fixed to the output shaft of this hydraulic motor 12
And the worm 13 is engaged with the foil 11.

Then, on the upper surface of the base end portion of the manipulator mounting member 6, the axial center O− of the vertical support shaft 3 maintained in the vertical direction.
The bucket support shaft 15 is erected and fixed in line with O.

That is, the bucket support shaft 15 is obtained by inserting a lower end portion into a sleeve 16 fixed by welding to the upper surface of the manipulator mounting member 6 and welding the upper end portion of the vertical support shaft 3 in the sleeve 16. Two synthetic resin plates 17a and 17b are housed between the upper end of the vertical support shaft 3 and the lower end of the bucket support shaft 15.

In this way, the synthetic resin plates 17a, 17 are attached to the upper end of the vertical support shaft 3.
The bucket spindle 15 supported via b
And winch 22 are attached.

The bucket 21 has a riding section 21a on which an operator rides, and a mounting section 21b integrally extending from the riding section 21a. The mounting section 21b is fitted to the bucket support shaft 15 to support the bucket. It is supported only by the shaft 15.

A second drive device 23 composed of a worm / wheel mechanism is configured at a fitting portion between the mounting portion 21b of the bucket 21 and the bucket support shaft 15, and a wheel 24 is fixed to the bucket support shaft 15. Worm 25 is mounting part 21b of bucket 21
The worm 25 and the wheel 24 are fixed to the output shaft of a hydraulic motor 26 fixed to the inside of the vehicle (see FIG. 3).

Further, a winch 22 is attached to the bucket support shaft 15 via a cap-shaped end fitting 27 attached to the upper end thereof.

This winch 22 has a winch boom 31 and a wire rope.
It is a publicly known one having 32 and a drum part 33 for winding the wire rope 32, and is attached to the end fitting 27 so as to be capable of undulating via a mounting bracket 34 installed at the lower part of the drum part 33.

Further, the winch 22 fixes the winch 22 to the bucket support shaft 15 by tightening the stop bolt 35 provided on the end fitting 27, and loosens the winch boom 31 so that the winch boom 31 of the winch 22 is oriented. It can be adjusted independently of.

The work for changing the position of the bucket 21 and the manipulator 7 at the tip of the boom 1 of the aerial work vehicle thus constructed is performed as follows (see FIGS. 4 (a) and 4 (b)).

When changing from the manual work state shown in FIGS. 1 and 4 (a) to the working state using the manipulator 7 (FIG. 4 (b)), the second drive device 23 is stopped. , The second drive device 8 is activated.

By operating the first drive device 8, the manipulator mounting member 6 is swiveled around the vertical support shaft 3 (arrow P in FIG. 4 (a)), and at the same time, fixed to the manipulator mounting member 6 by welding. Although the bucket support shaft 15 is also rotated, the bucket 21 supported by the bucket support shaft 15 has a heavy weight, and the worm 25 that constitutes the second drive device 23 is engaged with the wheel 24. It rotates with the rotation of the support shaft 15.

By stopping the operation of the first drive device 8 in accordance with the required work position, the position changing work is completed, for example, in the state shown in FIG. 4 (b), and the manipulator 7 may perform the work.

On the contrary, in the case where the manipulator 7 is located at the front side and the manipulator 7 is located at the rear position of the bucket 21 from the state shown in FIG. Similarly, by appropriately operating the first drive device 8, the position of the bucket 21 and the manipulator 7 can be changed.

That is, in the position changing work described with reference to FIGS. 4A and 4B, the manipulator 7 and the bucket 21 are along the arrow P while maintaining the relative positional relationship in which they are linearly arranged as illustrated. By turning as a whole,
The positions of the manipulator 7 and the bucket 21 are exchanged.

In addition, as in the case of finely adjusting the bucket position during manual work, the bucket 21
When adjusting the position of only the second drive device 23, the first drive device 8 is stopped and the second drive device 23 is appropriately operated (the third drive device 8).
See figure).

By doing so, since the worm / wheel mechanism of the first drive device 8 is engaged with the manipulator mounting member 6, the manipulator mounting member 6 is fixed to the vertical support shaft 3 and the bucket support shaft 6 is secured.
Since 15 is fixed to the manipulator mounting member 6, the operation of the second drive device 23 can rotate the bucket 21 around the bucket support shaft 15, and only the position of the bucket 21 is adjusted. The bucket 21 can be positioned in the state indicated by the phantom line in FIG.

At this time, the two synthetic resin plates 17a and 17b reduce the frictional force between the upper end of the vertical support shaft 3 and the lower end of the bucket support shaft 15.

As described above, in this embodiment, the hydraulic motor as the drive source is used as the first and second drive devices 8 and 23, but an electric motor may be used as the drive source. Needless to say, a human-powered driving device may be used.

Further, as described above, the drive devices 8 and 23 use the worm wheel mechanism which has the function of transmitting the driving force and the detent function, but the invention is not limited to this, and the driving force transmitting function and the detent function are not used. The function and the function can be achieved by different known means.

Further, in this embodiment, as the support structure of the bucket 21, the mounting portion 21b formed integrally with the bucket 21 is provided with the bucket support shaft 15
However, the present invention is also applicable to a structure in which the mounting portion 21b formed as a separate arm is supported by the bucket support shaft 15 as shown in FIG. can do.

(Effect of the Invention) Since the present invention is configured as described above, by rotating the manipulator mounting member around the vertical support shaft, the manipulator rotates at the same time, and at the same time, the bucket support is attached to the upper surface of the base end portion of the manipulator mounting member. Since the shaft is erected and the bucket is supported via the bucket support shaft, the bucket supported on the bucket support shaft on the manipulator mounting member can also be swung.

Therefore, it is possible to change the relative position between the bucket and the manipulator as it is without installing a special tuning device as in the past, and to install the bucket spindle on the manipulator mounting member above the vertical spindle. Since it can be configured by supporting the bucket, the structure is relatively simple.

Furthermore, since the bucket can be swung around the bucket support shaft independently of the manipulator mounting member, the workability during manual work can be favorably maintained.

[Brief description of drawings]

1 to 5 relate to an embodiment of the present invention, FIG. 1 is a schematic explanatory view of a boom tip portion of an aerial work vehicle, FIG. 2 is a sectional view of an essential part, and FIG. 3 is a sectional view of FIG. Operation explanatory view in the III-III section, FIGS. 4 (a) and 4 (b) are top views for explaining the position changing work between the manipulator and the bucket, FIG. 5 is an explanatory view of a modified example, and FIG. It is a schematic explanatory drawing of the boom front-end | tip part of an example aerial work vehicle. 1; boom, 3; vertical support shaft, 6; manipulator mounting member, 7;
Manipulator, 8; First drive device, 15; Bucket support shaft, 21; Bucket, 21b; Mounting portion, 23; Second drive device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Ishimaru 630-1 Koyama, Tayamadera-cho, Matsuyama City, Ehime Prefecture (72) Inventor Sanji Kawakami 14-10 Nakano-cho, Takamatsu City, Kagawa Prefecture (72) Inventor Atsuhiko Tajima Kagawa 66, Mure 1368, Mure, Mure-cho, Kida-gun, Japan (56) References: Showa Sho 63-144995 (JP, U) Showahei 1-94398 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A boom tip structure for an aerial work vehicle in which a bucket for an operator to ride on and a manipulator operated from above the bucket are attached to the tip of a boom that can be raised and lowered, and the tip of the boom is A vertical support shaft is provided which is erected so as to always maintain a vertical posture irrespective of the hoisting motion of the boom, and the base end of a manipulator mounting member equipped with the manipulator at its tip is rotatably attached to the vertical support shaft. , A bucket support shaft is erected on the upper surface of the base end portion of the manipulator mounting member on substantially the same axis as the axis of the vertical support shaft, and supports the bucket via the bucket support shaft. A boom tip structure for an aerial work vehicle, wherein the bucket is configured to be rotatable around the bucket spindle. 2. A first drive device is installed between the vertical support shaft and the manipulator mounting member to pivotally drive the manipulator mounting member around the vertical support shaft. Boom tip structure for the aerial work vehicle described. 3. The bucket support shaft is fitted with the mounting portion of the bucket so that the bucket is rotatable about the bucket support shaft, and the bucket support shaft is mounted between the bucket support shaft and the bucket mounting portion. Is a boom tip structure for an aerial work vehicle of a second drive device that swings and drives the mounting portion around the bucket spindle.