JPH0751958Y2 - Front jack operation device for work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a front jack operating device that supports a vehicle body such as a crane truck together with outriggers provided on the left and right side portions of the vehicle body.

(2) Related Art Conventionally, as shown in FIG. 3, an operating device (22) for a front jack (14) of a work vehicle has an outrigger operating device (22) provided on the left side or the right side of the vehicle body (1). In order to ground the front jack (14), which is provided adjacent to 12), hold the front jack (14) installed horizontally in front of the vehicle body (1) in a vertical state when used. Therefore, the front jack (14) was extended by operating the operation device (22) of the front jack (14).

(3) Problems to be Solved by the Invention However, in the conventional work vehicle, since the operating device for the front jack is provided on the left side portion or the right side portion of the vehicle body,
When grounding the front jack, hold the front jack, which is installed horizontally in front of the vehicle body, in the vertical state and then operate the front jack operating device to
Extend the front jack to ground it, but at this time the operator must extend the front jack while checking whether the front jack is grounded.Therefore, between the front jack and the front jack operation device. I had to go back and forth many times, and there was a problem that work efficiency was poor.

(4) Means for Solving the Problems In order to solve the above problems, the present invention comprises outriggers for supporting the vehicle body on the left and right side portions of the vehicle body, and supports the vehicle body in front of the vehicle body together with the outriggers. In a front jack operating device for a working vehicle having a front jack, a working vehicle for controlling expansion / contraction operation of the front jack is provided at a position near the front jack and operable from the front of the vehicle body. Front jack operating device.

(5) Operation With the above configuration, when performing work using the work vehicle, after operating the outrigger operating device to ground the outrigger, the operator moves to the front of the vehicle body and near the front jack. By operating the provided operating device,
While checking the extension state of the front jack, extend the front jack to ground it, and support the vehicle body with the outriggers and front jack.

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

As shown in FIG. 1, the work vehicle is provided with outriggers (2) for supporting the vehicle body (1) on the left and right sides of the front and rear of the vehicle body (1) so as to be extended and groundable, and to turn on the vehicle body (1). The turntable (3) is freely mounted, and the base end of the telescopic boom (4) is pivotally supported on the turntable (3). The telescopic boom (4) is telescopically moved by a built-in telescopic device (not shown). In addition, the turntable (3) and the telescopic boom (4) are raised and lowered by expansion and contraction of the hoisting cylinder (5) pivotally attached at both ends, and a winch (6) is provided at the rear of the turntable (3). A hook (10) is suspended from a head (9) at the tip of the telescopic boom (4) by a winch wire (7) which is drawn out and wound up by 6). On the right side of the turntable (3), there is provided an operation room (11) in which a worker gets on board and operates a crane during work.

A front jack (14), which is expandable and contractible in a vertical state in the vertical direction, is equipped in the lower front part of the vehicle body (1) so as to be selectively held in a horizontal state or a vertical state, and in the vicinity of the front jack (14). Is provided with an operation switch (15) which is an operation device for controlling the expansion and contraction operation of the front jack (14), and an electromagnetic switching valve (16) which is switched by a signal from the operation switch (15) is an outrigger operation device (1).
The front jack (14) is expanded and contracted by switching the electromagnetic switching valve (16) provided in the vicinity of 2).

FIG. 2 shows the operation circuit of the front jack (14),
The hydraulic pump (13) is connected to the outrigger operation valve (23) that controls the extension and extension operation of each outrigger (2), and the outrigger operation valve (23) is switched to extend and retract the front jack (14). An electromagnetic switching valve (16) for controlling the front jack (14) for expanding and contracting the front jack (14) is connected to the electromagnetic switching valve (16).
The extension side oil chamber is connected to the extension side oil chamber via the pilot check valve (18) by the pipe line (20), and is also connected to the contraction side oil chamber of the front jack (14) via the pipe line (21). ) And the pipeline (21) are communicated with each other via a relief valve (19), and each solenoid of the electromagnetic switching valve (16) is connected to the operation switch (15).

With the above configuration, when performing work using a work vehicle,
After operating the outrigger operation device (12) provided on the right side portion of the vehicle body (1) to ground the outrigger (2), the operator moves to the front of the vehicle body (1) and attaches the front jack (14). Hold vertically and front jack (14)
By operating the operation switch (15) provided in the vicinity of the front jack (14), the electromagnetic switching valve (16) is switched and the front jack (1) is checked while checking the extension state of the front jack (14).
4) Extend and ground, and support the vehicle body (1) with the outrigger (2) and front jack (14). After the work is completed, the operator moves to the front of the vehicle body (1) and the front jack (14) supporting the vehicle body (1) in a vertical state is provided with an operation switch (15) provided near the front jack (14). ) Is contracted to hold the contracted front jack (14) in a horizontal state, and then the outrigger operation device (12) is operated to contract the outrigger (2).

(7) Effects of the Invention As described above, according to the present invention, the front jack operation device for operating the expansion / contraction operation of the front jack is provided in the vicinity of the front jack that supports the vehicle body together with the outrigger. In addition, it is possible to ground while confirming the expansion and contraction operation of the front jack, which prevents the worker from making unnecessary movements as in the past, and it is safe and reliable to ground the front jack. The present invention is effective in improving workability and safety of a work vehicle.

[Brief description of drawings]

FIG. 1 is a side view showing a working state of a work vehicle using the front jack operating device according to the present invention, FIG. 2 is an explanatory view of an operation circuit of the front jack, and FIG. 3 is a conventional front jack operating device. It is a side view which shows the working state of a working vehicle. 1 ... Body, 2 ... Outrigger, 3 ... Turntable, 4 ...
Telescopic boom, 14 ... front jack, 15 ... operation switch, 16 ... switching valve.

Claims (1)

[Scope of utility model registration request] 1. A front jack operating device for a work vehicle, comprising: outriggers for supporting the vehicle body on left and right side portions of the vehicle body; and a front jack for supporting the vehicle body together with the outriggers in front of the vehicle body. A front jack operation device for a working vehicle, comprising an operation device for controlling expansion / contraction operation of the front jack at a position operable from the front of the front jack.