JPH0622715Y2 - Aerial work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an aerial work vehicle equipped with a pair of work platforms at the tip of a boom, and is used, for example, when performing work in high places such as electrical work. Used.

(Prior Art) Conventionally, as shown in FIG. 4 and FIG. 5, an aerial work vehicle is provided with a vertical support shaft b at the tip of an extendable boom a, and the vertical support shaft b is provided above and below the vertical support shaft b. Two L-shaped arms c,
Each of the L-shaped arms c and c is pivotally supported so that the L-shaped arms c and c are rotatable in a horizontal plane. The buckets d and d are respectively attached to the ends of the L-shaped arms c and c in the horizontal direction. It was pivotally supported by.

(Problems to be solved by the invention) However, in the above-described conventional configuration, since the two L-shaped arms c, c are pivotally supported in the form of being stacked on the vertical support shaft b, they are arranged vertically. The two left and right L-shaped arms c, c thus rotated rotate in respective horizontal planes having different ground heights. For this reason, the ground height of one of the work platforms is increased by the amount of the L-shaped arms being stacked, and one of the work centers is also arranged in an unbalanced state with a high center of gravity, resulting in a large overturning moment. Therefore, it is difficult to expand the moving range of the bucket d.

(Means for Solving the Problem) In an aerial work vehicle of the present invention, the base ends of a pair of L-shaped arms that are rotatable in the same horizontal plane at the left and right positions of the tip of the boom are pivotally supported at appropriate distances. A work table is pivotally supported at the tip of each of these L-shaped arms. A workbench is pivotally supported on the tip of the L-shaped arm at a position offset from the center thereof.

(Operation) By rotating the left and right two L-shaped arms in the same plane, it is possible to arrange them in a well-balanced and stable manner even if the tip of the L-shaped arm is extended as long as possible. The range of movement of the workbench can be widened. Also,
By pivotally supporting the workbench at the tip of the L-shaped arm at a position offset from its center, the range of movement of the workbench can be further widened.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an aerial work vehicle according to the present invention,
FIG. 3 shows a bucket provided at the tip of the boom of an aerial work vehicle and shows the movable range of this bucket.

A rotatable turntable 2 is mounted on the vehicle body 1. A base end portion of the telescopic boom 3 is pivotally supported on the turntable 2, and the telescopic boom 3 is mounted on the turntable 2.
It is configured to be expandable and contractible by an expandable cylinder (not shown) built in the. A hoisting cylinder 4 is provided between the turntable 2 and the telescopic boom 3, and the telescopic boom 3 is configured to be hoistable by expanding and contracting the hoisting cylinder 4.

Base ends of a pair of L-shaped arms 7, 7 are pivotally supported via a frame 6 on both left and right sides of the vertical support shaft 5 at the tip of the telescopic boom 3. The L-shaped arms 7 and 7 have their base end portions independently pivoted on both left and right sides of the tip end portion of the telescopic boom 3 with an appropriate distance l, and the bent tip end portions are shown in FIG. When the bucket shown in FIG. 2 is stored, it is arranged so as to project to the left and right sides respectively. These L-shaped arms 7, 7 are rotatable in the same horizontal plane by a driving device such as a hydraulic motor (not shown). In this way, the left and right L-shaped arms 7 and 7 are rotated in the same horizontal plane, so that the L-shaped arms 7 and 7 are rotated.
The height of the ground will be the same, and they will be placed on the left and right in a well-balanced manner. Therefore, conventionally, the left and right L-shaped arms 7,
The structural restriction imposed by the imbalance of 7 is relaxed, and the tip portions of the L-shaped arms 7, 7 can be extended to the left and right sides as described later.
A bucket (workbench) 8 is provided at the tip of the L-shaped arm 7. The tip of the L-shaped arm 7 is pivotally supported at a position offset (offset) outward from the center of the bucket 8 in the left-right direction. By pivotally supporting the bucket 8 at the position offset outward in this manner, the L-shaped arm 7,
The tip portion of 7 can be extended as long as possible, and even if the tip portions of the L-shaped arms 7, 7 are pulled out to the left and right sides to the full width of the vehicle, the bucket 8 does not protrude from the vehicle width. Here, even if the tip of the L-shaped arm is extended to the left and right sides, the left and right L-shaped arms 7 and 7 rotate in the same plane, so that the left and right are balanced and stable. Therefore, the movable range of the bucket 8 can be expanded by the amount by which the tip portions of the L-shaped arms 7 and 7 are extended to the left and right sides. The bucket 8 is constructed so that it can be swung (rotated) in a horizontal plane by a drive device such as a hydraulic motor (not shown). L configured as above
The mold arm 7 and the bucket 8 are provided symmetrically on both sides of the tip portion of the telescopic boom 3.

Further, the bucket 8 is provided with a control valve for controlling each of the hydraulic motors. By operating the control valve to appropriately operate each of the hydraulic motors, the L-shaped arm 7 is rotated, and Bucket 8
Is swung to move the bucket 8 to an arbitrary position. Reference numeral 9 in the drawing denotes a boom rest 10 of the telescopic boom 3.
Are jack devices provided on the front, rear, left and right of the vehicle body 1 to support the vehicle body 1.

Next, the operation of the aerial work vehicle thus configured will be described.

First, the jack devices 10 are extended to support the vehicle body 1. Then, the hoisting cylinder 4 and a telescopic cylinder (not shown) are extended to dispose the tip end portion of the telescopic boom 3 at an appropriate position. After that, the control valve provided in the bucket 8 is operated to drive-control each hydraulic motor to rotate the L-shaped arms 7 and 7, and to swing the buckets 8 and 8. As a result, the buckets 8 and 8 can be moved to arbitrary positions within the horizontal plane at the tip of the telescopic boom 3.

In FIG. 3, the thin line indicates the moving range of the bucket 8 in the aerial work vehicle configured as described above.

As can be seen from this figure, the movable range of the bucket 8 of the aerial work vehicle according to the present invention is smaller than the movable range of the bucket of the conventional aerial work vehicle shown by a thin line in FIG. It becomes wider by the distance 1 between both base end portions 7 and 7 and the offset of the bucket 8.

After the work is completed, as shown in FIG. 1, the telescopic boom 3 is stored in the boom rest 9, the jack device 10 is retracted, and the bucket 8 is stored as shown in FIG. This aerial work vehicle becomes movable.

(Effect of the Invention) As described above, according to the aerial work vehicle of the present invention,
Since the pair of left and right L-shaped arms and the workbench move in the same horizontal plane, the left-right balance is improved, and the tipping moment can be suppressed to a small range, so the range of movement can be expanded compared to the conventional one, and the efficiency is improved. You can work in high places. In addition, even when the workbench is stored in the vehicle, the ground height of one workbench is lower than that of the conventional workbench, and the left and right workbench heights are the same and are arranged in a well-balanced manner, thus ensuring stability during running. Is improved.

Furthermore, the range of movement of the work table can be further expanded by offsetting and pivotally supporting the work table at the tip of the L-shaped arm.

[Brief description of drawings]

1 to 3 show an embodiment of an aerial work vehicle according to the present invention, and FIG. 1 is a side view showing a schematic configuration of the aerial work vehicle,
FIG. 2 is a plan view of the same, FIG. 3 is a plan view showing a pair of buckets provided around the boom tip of an aerial work vehicle and its peripheral structure, and a moving range of the buckets.
FIGS. 5 and 5 show a conventional aerial work vehicle, FIG. 4 is a side view showing a bucket provided at a boom tip of a conventional aerial work vehicle, and FIG. 5 is a conventional aerial work vehicle. It is a top view which shows a pair of buckets provided in the boom front-end | tip part, and its periphery structure, and shows the movement range of a bucket. 3 ... Telescopic boom, 7 ... L-shaped arm 8 ... Bucket (workbench)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown 60-133898 (JP, U) Shown 61-185800 (JP, U) Shown 64-12096 (JP, U) Shown 1- 109097 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A pair of L-shaped arms, each of which is rotatable in the same horizontal plane, is pivotally supported at right and left positions of the tip of the boom with a proper distance therebetween. An aerial work vehicle characterized by being pivotally supported. 2. An aerial work vehicle according to claim 1, wherein a workbench is pivotally supported at a position offset from the center of the tip of the L-shaped arm.