JPH0620795Y2 - Aerial work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an aerial work vehicle, and particularly to a bucket type small aerial work vehicle.

(Prior Art) A swivel post is erected on a loading platform, and an extendable or retractable boom is attached to the upper end of the swivel post, and the tip of the boom is loaded with tools, materials, etc., if required by an operator. Aerial work vehicles equipped with buckets are often used for so-called aerial work such as maintenance and maintenance of structures such as transmission and distribution lines and bridges.

These aerial work vehicles were used for work in relatively large areas, but their applications gradually became wider and used in narrow work areas, for example, work in alleys where small trucks could barely enter. It started to come.

For this reason, the vehicle to be used as an aerial work vehicle should be made small, and instead of requiring a high working height and a wide turning range, the turning posts, booms, buckets, etc. should be made smaller, and the aerial work place should be compact. Work vehicles have come into demand.

In order to meet such demands, there are conventionally known some which use a refraction boom. By the way, the refraction type has the advantage that the boom length when folded is short, and the working range is wide during work, but during work, the bent part of the boom may project to the opposite side of the bucket during work. Yes, it may limit the work range unexpectedly.

Also, in such a small aerial work vehicle, the center of the swing post is erected eccentrically from the center line of the left and right sides of the loading platform so that the bucket does not protrude from the loading platform when the boom and bucket are stored on the loading platform. However, there is also a problem that it is difficult to balance the left and right directions in terms of weight.

(Problems to be Solved) This invention is a compact aerial work vehicle in which there is no limitation on the work range due to boom overhang, etc., and there is a good weight balance in the left-right direction and a compact boom.
The challenge is to put the buckets and other items on the table.

(Means for Solving the Problems) In the aerial work vehicle of the present invention, the upper part is inclined obliquely upward on the left and right center lines of the loading platform, slightly forward of the center, and the horizontal dimension exceeds half of the loading platform width. There is a swing post standing upright, without an arm. A telescopic boom that expands and contracts on the opposite side of the arm-shaped portion is attached to the upper end of the swiveling post so that it can be undulated. Moreover,
The swivel post is positioned so that the telescopic boom is positioned slightly tilted with respect to the left and right center lines of the bed in the storage position on the bed. Further, a work bucket is attached to the tip of the telescopic boom so as to be able to maintain a horizontal posture and on the hand side of the bucket in the extending direction of the boom.

(Example) An example in which a two-stage telescopic boom is attached will be described.

1 and 2, the loading platform 1a of the light truck 1
On the left and right center lines 1b of the loading platform 1a, a turning post 2 is provided upright slightly forward of the center. The swivel post 2 is swung on both sides of the left-right center line 1b of the luggage carrier 1a by a drive device (not shown). The upper portion of the swivel post 2 is inclined obliquely upward to form an arm-shaped portion 2a, and the horizontal dimension thereof does not exceed half the width of the luggage carrier 1a. The base end of the first stage boom 3a of the two-stage telescopic boom 3 is attached to the tip of the turning post 2 by an attachment 2b. In the first stage boom 3a, a second stage boom 3b that is driven by an unillustrated hydraulic telescopic cylinder and moves back and forth is slidably inserted. Here, the two-stage telescopic boom 3 expands and contracts in the direction opposite to the direction in which the arm portion 2a is provided, and when it is stored on the luggage carrier, it is slightly inclined with respect to the left-right center line 1b of the luggage carrier 1a. The two-stage telescopic boom 3 is the first-stage boom 3a.
A hydraulic undulating cylinder 4 is connected between the approximate center of the arm and the approximate center of the arm-shaped portion 2a.

The bucket 5 on which the operator carries tools, parts, materials, etc. and rides on the hand side in the extension direction of the two-stage telescopic boom 3 is a bracket 5a for attaching the second stage boom 3b.
Is provided, and is attached 3c to the tip of the second stage boom 3a on the bracket 5a. Also, the bracket 5a
A hydraulic level cylinder 6a is connected between the lower part of the second stage boom 3b and the lower end of the second stage boom 3b, and a hydraulic level cylinder 6a is connected between the base of the first stage boom 3a and the tip of the arm-shaped part 2a of the turning post 2. The expression level cylinder 6b is connected. The level cylinders 6a and 6b are provided with known pipes so that a desired amount of pressure oil flows in and out as the undulating cylinder 4 expands and contracts. Keep your posture always horizontal.

In addition, on the side surface of the bucket 5 on the side of the two-stage telescopic boom 3
An operation panel 7 having a lever for operating the turning of the turning post 2 and the raising and lowering and extension of the two-step telescopic boom 3 is mounted, and each operation lever is not shown by an operation cord or electric wire not shown. It is connected to hydraulic valves and electrical contacts. Although not shown, the hydraulic valve may be mounted on the boom side or the cargo bed side, and the operation panel may be partially mounted on the cargo bed side. The hydraulic cylinder and the like are connected to each other by hydraulic piping, electric wiring, and the like (not shown) to form a known hydraulic circuit and electric circuit.

On the platform 1a, the oil reservoir 8 for the hydraulic circuit,
In addition to the steps 9a and 9b for loading the bucket 5 and the tool boxes 10a and 10b separated on the left and right sides of the turning post 2, an outfit with a jack for lifting and holding the vehicle body during work is attached. 11 is attached to the lower part of the loading platform.

Prior to working at a high place, the engine of the small truck 1 operates a hydraulic pump (not shown) to supply the pressure oil in the oil reservoir 8 to the hydraulic circuit. When the lever of the operation panel 7 is operated to erect, extend and swivel the two-stage telescopic boom 3 as appropriate, the horizontal dimension of the arm-shaped portion 2a of the swivel post 2 does not exceed half the width of the platform 1a. The attachment part of the two-stage telescopic boom 3 does not stick out from the cargo bed,
No overhang of the bend occurs as in a bendable boom.

Further, since the revolving post 2 is located on the left-right center line of the luggage carrier 1a, the weight balance in the left-right direction is good even when the two-stage boom 3 is fully extended and rotated. Therefore,
It is easy to operate and stable when working in high places. In this embodiment, since the tool box is divided into 10a and 10b, the turning post 2 and its rear can be visually recognized from the driver's seat through these, and the turning post can be easily approached for maintenance. . Furthermore, although the two-stage telescopic boom 3 is longer than the refraction boom, when it is stored on the luggage carrier 1a, it can be compactly stored without protruding from the luggage carrier 1a. The tool box may be integrated into the left and right.

(Effect) As described above, according to the present invention, there is no limitation on the work range due to the protrusion of the attachment part between the turning post and the telescopic boom, and the telescopic boom has a good weight balance in the left-right direction. It is possible to provide a small aerial work vehicle that can store the boom very compactly while using it.

[Brief description of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view and FIG. 2 is a top view. In the drawings, 2 is a swing post, 3 is a two-stage telescopic boom, and 5 is a bucket.

Claims (1)

[Scope of utility model registration request] 1. A swiveling post having an arm-like portion, in which the upper portion is inclined obliquely upward on the right and left center lines of the vehicle bed, slightly forward from the center, and the horizontal dimension does not exceed half of the bed width. Erected a telescopic boom that can expand and contract on the side opposite to the arm-shaped part at the upper end of the swing post so that the work bucket can be placed horizontally on the tip of the telescopic boom. It is maintainable and attached at the hand side of the bucket with respect to the extension direction of the boom, and when the swivel post is at the storage position of the telescopic boom in the cargo bed, the telescopic boom is aligned with the left-right center line of the cargo bed. A small aerial work vehicle that is positioned so that it tilts slightly.