JPH0231505Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is used in the field of stabilizing the body of an aerial work vehicle during work.

(b) Prior art In general, high-altitude work vehicles are equipped with an outrigger device to stabilize the vehicle body during work, but since the workable range varies depending on the amount of overhang of the outrigger device, There was a need for people to know the amount of overhang.

Therefore, conventionally, as shown in FIG. 5, limit switches 02, 02 were provided on an outer cylinder 01 fixed to the vehicle body, and detection members 05, 05 of different lengths were installed on an extendable inner cylinder 04 having a support leg 03 at the tip. The overhang amount is detected based on the presence or absence of the detection members 05, 05 at the positions of the limit switches 02, 02.

However, in the above structure, since the limit switch and the detection member protrude from each cylinder, they are easily damaged by an operator, and the detection member is required in addition to the limit switch, resulting in high cost.

(c) Problems to be Solved by the Invention This invention solves the above-mentioned drawbacks, and includes a limit switch provided in the barrel of a hydraulic cylinder that expands and contracts the inner cylinder, and this limit switch is brought into contact with the inner surface of the inner cylinder. This is what I did.

(d) Means for solving the problem The present invention forms an overhanging device with an outer cylinder fixed to the vehicle body side and an expandable inner cylinder, and inside the overhanging device, there is a mechanism that connects the barrel side to the outer cylinder. A hydraulic cylinder is provided with each rod side being pivotally supported by an inner cylinder, and a support leg that can extend downward is provided at the tip of the inner cylinder,
The present invention relates to a telescoping outrigger device in which a limit switch is provided on the outer periphery of the barrel of the hydraulic cylinder and is brought into contact with the inner surface of the inner cylinder.

(e) Embodiment An embodiment will be described below with reference to the drawings. Reference numerals 1 and 1 indicate a pair of overhang devices attached to the vehicle body 2.
Since the pair of extension devices 1 and 1 have the same structure, one of them will be explained. An outer cylinder 3 having a rectangular cross section is fixed to the vehicle body 2, and an expandable and retractable inner cylinder 4 of similar shape is provided inside the outer cylinder 3.

A hydraulic cylinder 5 for expanding and contracting the inner cylinder 4 is provided in both cylinders 3 and 4, and the barrel 6 side of the hydraulic cylinder 5 is supported by the outer cylinder 3, and the rod 7 side is supported by the inner cylinder 4, respectively.

A support leg 8 is fixed to the tip of the inner cylinder 4, and the support leg 8 can extend downward, and a stabilizing plate 9 provided at the lower end comes into contact with the ground, thereby stabilizing the vehicle body 2.

Two limit switches are provided on the outer side of the barrel 6 of the hydraulic cylinder 5 at intervals in the front and rear direction.
LS1 and LS2 are installed, and the limit switches LS1 and LS2 are connected and disconnected at the rear end of the inner cylinder 4, and when the inner cylinder 4 is at its maximum contraction, they come into contact with the inner surface of the inner cylinder 4 and are "broken".
state, and when the inner cylinder 4 is fully extended, the inner cylinder 4 is
The contact with the inner surface is released and the state is "contact".

Next, an electric circuit will be explained with reference to FIG. 4. A first circuit 12, a second circuit 13, and a third circuit 14 are branched from a main circuit 11 having a main switch 10, and the branched circuits 12, 13, 14 are provided with lamps 15, 15, and 15, respectively, the second circuit 13 is provided with a limit switch LS1 on the base side of the hydraulic cylinder 5, and the third circuit 14 is provided with a limit switch LS2 on the front side.

According to the circuit, when the main switch 10 is turned on when the inner cylinder 4 is fully contracted, only the lamp 15 of the first circuit 12 lights up, and when the inner cylinder 4 is extended to the middle,
When the limit switch LS1 becomes "closed", the lamp 15 of the second circuit 13 is also turned on, and when the inner cylinder 4 is fully extended, the limit switch LS1 is turned "closed" and the lamp 15 of the third circuit 14 is also turned on.

As a result, one lamp is lit when the inner cylinder 4 is at its maximum contraction, two lamps are lit when it is in the middle, and three lamps are lit when it is fully extended.

In the embodiment, the amount of overhang is displayed using a lamp, but it is also possible to incorporate it into a control device for working equipment on the vehicle body.

The present invention has the above-mentioned structure. Next, the operation will be explained. First, as shown in FIG. ”.

As a result, only one of the lamps in the first circuit 12 is lit, so that the operator knows that the inner tube 4 is in the most contracted state and that work beyond the range of the vehicle body 2 cannot be performed.

Next, the inner cylinder 4 is extended to the middle, the support legs 8 are extended, and the stabilizer plate 9 is grounded.

With this, the limit switch LS1 is separated from the inner cylinder 4 and becomes "contact", and the lamp is connected to the first circuit 12 and the second circuit.
Two of the circuits 13 are lit, and the operator knows that the inner cylinder 4 is in the intermediate state, and can work to a range slightly beyond the range of the vehicle body 2.

Further, as shown in FIG. 3, the inner cylinder 4 is fully extended, and in this state, the support legs 8 are extended and the stabilizer plate 9 is grounded.

With this, the limit switch LS2 is also separated from the inner cylinder 4 and becomes "connected", and the lamps are connected to each circuit 12, 1.
3 and 14 are lit, and the operator knows that the inner tube 4 is in its maximum extended state, and that the worker can work in a range that greatly exceeds the range of the vehicle body 2.

(f) Effect of the invention As described above, the present invention provides a limit switch on the barrel of a hydraulic cylinder that expands and contracts the inner cylinder, and connects and disconnects the limit switch by bringing it into contact with the rear end of the inner cylinder. Since it is designed to fit in, there is no need for the limit switch to stick out and be damaged as in the conventional case, the appearance is clean, and there is no need for a detection member, so it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view, FIGS. 2 and 3 are partially sectional top views, FIG. 4 is an electric circuit, and FIG. 5 is a conventional example. 3 is an outer cylinder, 4 is an inner cylinder, 5 is a hydraulic cylinder, 8 is a support leg, and LS1 and LS2 are limit switches.

Claims (1)

[Scope of utility model registration request] An extension device is formed by an outer cylinder fixed to the vehicle body side and an expandable inner cylinder, and a hydraulic cylinder is provided in the extension device, with the barrel side being supported by the outer cylinder and the rod side being pivotally supported by the inner cylinder. A telescoping outrigger device comprising: a support leg that can extend downward at the tip of the inner cylinder; and a limit switch that connects and disconnects at the rear end of the inner cylinder and enters the inner surface of the inner cylinder on the outer circumference of the barrel of the hydraulic cylinder; .