JPH0520795Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is equipped with a weight that can be slid left and right on the back of the chassis, and the weight is linked to the extension status of the outrigger, so that it can be used when working with an aerial work vehicle. This invention relates to a weight slide device for an aerial work vehicle configured so that the center of gravity of the vehicle is always located at the center of the vehicle when traveling.

[Prior art and its problems]

Conventional aerial work vehicles that are equipped with a bucket at the tip of the boom have a bucket that can be folded onto the side of the boom to shorten the overall length of the vehicle when traveling, allowing it to be stored as compactly as possible. I have to. The method for storing the boom and the bucket in this type of aerial work vehicle is to position the bucket on the side of the boom by eccentrically moving the tip of the boom to the right, for example, and folding the bucket to the left to make it more compact. However, in the above-mentioned aerial work vehicle, the bucket is placed on the side of the boom, which causes the vehicle to lose its left-right balance in the running position, causing it to fall over during vehicle inspection. An angle problem arises. Therefore, in the above-mentioned type of aerial work vehicle, the reality is that a weight is installed on the opposite side of the boom from the eccentric side to maintain the left and right balance of the aerial work vehicle when traveling. .

However, in the case of an aerial work vehicle that has taken the above measures, in terms of stability when working at height when the outriggers are extended over a predetermined span, the safe weight will deviate from the center of the amount of outrigger extension. Therefore, there was a problem that safety during work was compromised.

[Means and actions for solving problems]

The present invention was developed in view of the above circumstances, and includes a weight that can be slid at a predetermined position on the back of the chassis of an aerial work vehicle between approximately the center of the chassis and either the left or right side of the chassis. The weight is equipped with a weight sliding cylinder that expands and contracts in conjunction with a telescoping cylinder that extends an outrigger to the right or left side of the vehicle chassis, and the weight is moved by a weight sliding cylinder that extends and contracts in conjunction with a telescoping cylinder that extends an outrigger to the right or left side of the vehicle chassis. It is configured so that it is located approximately in the center of the chassis when working, and is located on the left or right side of the chassis when the aerial work vehicle is moving, and the center of gravity of the vehicle is automatically shifted during work and when driving. It is an object of the present invention to provide a weight slide device for a high-altitude work vehicle that can provide sufficient stability during operation. [Embodiment] Hereinafter, an embodiment of the weight slide device for an aerial work vehicle according to the present invention will be described in detail based on FIGS. 1 and 2.

In the figure, 1 is an aerial work vehicle, 2 is a turntable, and 3 is a base end pivotally connected to the turntable,
a boom that is raised by a raising cylinder 4 and extended and contracted by a predetermined length by a built-in telescopic cylinder;
5 is a bucket equipped at the tip of the boom 3;
Reference numerals 6a and 6b indicate outriggers that are extendably installed on the left and right sides of the vehicle chassis 1a (outriggers located on the front left and right sides are omitted in the figure).

7 is a weight installed on the rear back side of the chassis 1a, and this weight 7 is attached to the right outrigger 6.
It can be slid left and right by a weight sliding cylinder 7a equipped to interlock with the telescopic cylinder 6c on the b side. As shown in the figure, the weight 7 in this embodiment is configured such that the boom 3 is eccentric to the right side and the bucket bag 5 is bent to the left side and stored. The position is eccentric to the left side of the chassis 1a.

Incidentally, a hydraulic circuit for interlocking the outrigger 6b and the weight sliding cylinder 7a is constructed as shown in FIG. 2.

In the figure, 8 is a hydraulic pump, 9 is an outrigger operation valve, 10 is a double pilot check valve installed on the input/output side of the telescopic cylinder 6c on the right outrigger 6b side, and 11 is a relief valve.

The outrigger operating valve 9 is a three-position switching type, and as shown in the figure, when in the A position, a predetermined controlled oil supply is possible to the upper operating valve system, and when in the B position, the telescopic cylinder 6c of the outrigger 6b is When the weight sliding cylinder 7a is extended, the weight sliding cylinder 7a is contracted, and conversely, when the outrigger is in the C position, the telescopic cylinder 6c of the outrigger is contracted, and the weight sliding cylinder 7a is extended by a predetermined length.

Hereinafter, the operation of the weight slide device for an aerial work vehicle according to the present invention will be explained in detail using the above-mentioned embodiments.

Since the weight slide device of the aerial work vehicle 1 according to the present invention is configured as described above, when working at height, the boom 3 is extended by a predetermined length and raised and lowered by a predetermined angle to reach a predetermined height, as shown in FIG. When performing stationary work, when the outriggers 6a and 6b are extended to the left and right, the weight sliding cylinder 7a, which is linked to the right outrigger 6b, is contracted and the position of the weight 7 (as shown in FIG. 1) is reduced. state) slides to the right and is set at approximately the center position of the chassis 1a as shown in FIG. Therefore, in this state, the work center of gravity of the aerial work vehicle 1 is at both the outriggers 6.
It becomes the center of the overhanging spans a and 6b, ensuring sufficient stability for work at heights.

On the other hand, when the above-mentioned high-place work is completed and the boom 3 and the bucket 4 installed at its tip are retracted as shown in Fig. 1, the center of gravity of the high-place work vehicle 1 shifts to the left by the eccentricity of the boom 3. I will have to move, but
In this state, the weight sliding cylinder 7a, which is linked to the contracted state of the right outrigger 6b, expands and moves the weight 7, which is located approximately in the center of the chassis 1a, to the left during work. Even when the boom 3 and the bucket 4 are stored in the state shown in FIG.
The center of gravity is located in the center of the vehicle, ensuring stable driving.

[Effect of idea]

As explained above in detail, the present invention is equipped with a weight at a predetermined position on the back surface of the chassis of an aerial work vehicle so as to be able to slide between the approximate center position of the chassis and the left or right side position of the chassis. The weight is slid by a weight sliding cylinder that expands and contracts in conjunction with a telescoping cylinder that extends an outrigger to the right or left side of the vehicle chassis, and the weight is moved from the vehicle chassis when working on an aerial work vehicle. It is located approximately in the center of the platform, and is configured to be located on the left or right side of the chassis when the aerial work vehicle is running, so the center of gravity of the vehicle is automatically moved when working and when driving, and the vehicle To provide a weight slide device for an aerial work vehicle, which can set the center of gravity of the vehicle at a stable position and ensure safety both during work and during travel.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an example of an aerial work vehicle equipped with the weight slide system of the aerial work vehicle according to the present invention, Figure 2 is a hydraulic circuit diagram, and Figure 3 explains the weight slide device as described above. FIG. 1... Aerial work vehicle, 1a... Chassis, 2... Turntable, 3... Boom, 4... Lifting cylinder, 5... Bucket, 6a, 6b... Outrigger, 6c... Telescopic cylinder, 7... …weight,
7a... Weight sliding cylinder, 8... Hydraulic pump, 9... Outrigger operation valve, 10... W
Pilot check valve, 11...Relief valve.

Claims (1)

[Scope of utility model registration request] A weight is installed at a predetermined position on the back surface of the platform of the aerial work vehicle so that it can slide between the approximately center position of the platform and the left or right side of the platform, and the sliding of the weight is controlled to the right or right side of the platform. It is configured to be carried out by a weight sliding cylinder that expands and contracts in conjunction with a telescoping cylinder that extends the outrigger to the left.
A weight slide device for an aerial work vehicle, characterized in that the weight is located approximately at the center of the undercarriage when the aerial work vehicle is working, and is located on the left or right side of the undercarriage when the aerial work vehicle is traveling. .