JPS6328697Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is suitable for work vehicles equipped with outriggers on both sides, especially for work vehicles that require double or triple safety devices, such as aerial work vehicles that climb or turn while carrying people on a platform. This invention relates to an outrigger operation confirmation device suitable for automobiles.

Conventionally, as shown in Figure 3, overhanging beams B on both sides of the vehicle body
In an outrigger having a hydraulic telescoping support leg C attached to the tip of each of the outriggers, when the extension operation of the hydraulic telescoping support leg is completed, there is a detection means for switching a limit switch E attached to the cylinder body side using a switch operating rod D installed at the lower end of the piston rod. etc., to confirm the operation of the outriggers, but since a similar detection means must be provided for each hydraulic telescoping support leg, not only does the outrigger operation confirmation device become complicated, but also the outrigger body support operation is If the platform moving hoist device is automatically controlled so that the platform movement operation of the aerial work vehicle cannot be carried out until the work is completed, failure is likely to occur.

The present invention addresses this problem by connecting the central part of the rear axle and one end of the switch actuating cam, which is pivoted above the central part on the vehicle body, with a flexible strip. A stopper that prevents the switch actuating cam from rotating in the direction of lifting the body, a spring that always urges the corresponding part of the switch actuating cam to engage with the stopper, and switching by the rotation of the switch actuating cam when the flexible strip body is pulled down. The present invention is characterized in that a limit switch is attached to the vehicle body, and the length of the flexible strip is set so that the limit switch is switched by a switch operating cam when the outriggers complete supporting the vehicle body.

An embodiment of the present invention will be described below with reference to the drawings.
Reference numeral 1 indicates a chassis frame to which front wheels 2 and rear wheels 3 are respectively attached by a rigid axle suspension system, 4 a subframe fixed on the chassis frame 1, 5 a motor vehicle cab, and 6 a platform. 6 is attached to a turntable 7 attached to the subframe 4 via a foldable boom-shaped hoist device 8 so as to be freely movable up and down. Both side outriggers are provided in front and behind the rear wheel 3 or rear axle 9, respectively, and the front outrigger has hydraulic telescopic support legs 11 vertically attached to the tips of horizontal beams 10, 10 that extend forward from the subframe 4 to both sides. The rear outrigger is constructed by vertically attaching hydraulic telescopic support legs 13 to the tips of horizontal beams 12, 12 extending rearwardly from the subframe 4 to both sides.

Reference numeral 14 denotes a support member fixed to the intersection portions of both horizontal beams 12, and a fork-shaped portion 14a at the lower end of the support member 14 has a switch operating cam 15 that rotates within a vertical plane including the longitudinal axis XX of the automobile. The switch actuating cam 1 is pivoted by a horizontal shaft 16.
A chain-like flexible strip 18 is disposed between the rear end of the arm 17a of the rear axle 9 and the tip of the arm 17a that projects rearward from the center 0 of the differential outer casing 17 of the rear axle 9 so as to be located within the vertical plane. are connected. The horizontal axis 16 is the arm 17a
The upper end of the illustrated flexible strip body 18 is connected to the rear end of the lever-like extension portion 15a of the switch operating cam 15.

The switch operating cam 15 is connected to this and the support member 14.
A tension spring 19 tensioned between the flexible strip body 1
The front end of the switch actuating cam is always urged to rotate in the direction of pulling up the switch actuating cam 8, and when no external force is applied, the front end of the switch actuating cam is attached to the support member 1.
4 to maintain the switch actuating cam 15 in the position shown in FIG. The upper surface of the switch operating cam includes arcuate cam surfaces 15b and 15c centered on the horizontal axis 16, and the arcuate cam surface 1
The radius of 5c is larger than the radius of the arcuate cam surface 15b, and a switch switching slope 15d is formed therebetween. 20 is a limit switch attached to the upper part of the support member 14, and the tip roller 22 of the switch switching element 21 substantially engages with the switch switching slope 15d.

The length of the chain-like flexible strip body 18 is the same as that when the outrigger has completed the vehicle body support operation, that is, when the front and rear both sides of the hydraulic telescopic support legs 1
1 and 13 touch the ground to support the vehicle body, the limit switch 20 is set to be switched by the switch switching slope 15d of the switch operating cam 15 and to issue a signal. An equal distribution valve is inserted into the hydraulic circuit between the hydraulic power source and the front and rear hydraulic telescopic support legs 11 and 13 to supply pressure oil to the both-side hydraulic telescopic support legs 11 and the both-side hydraulic telescopic support legs 13 that communicate with each other. It is better to always move the vehicle up and down approximately horizontally by making the amount equal.

A limit switch 20 is inserted into the control circuit of the hoist device 8 for moving the platform so that the hoist device 8 can only be driven when the limit switch issues a signal.

In the above configuration, when the outriggers are operated to support the vehicle body, as the front and rear hydraulic telescoping support legs extend, the rear axle 9 and the rear wheel 3 descend with respect to the chassis frame 1 due to the unsprung load of their suspension springs or their own weight, and As a result, the flexible strip 18 becomes tensed as shown by the chain line in FIG. It is rotated clockwise, and the limit switch 20 is switched by the switch switching slope 15d, allowing the hoist device 8 to be driven.

Also, when driving on the road, switch operation cam 15
Because the elasticity of the spring 19 maintains the position shown in FIG. 2 in which it engages with the stopper 14b, the flexible strip 18
Even if the chassis frame 1 bounces against the rear axle 9 within a range where it is not tensed, the deflection of the flexible body will only change, and there is no risk that the limit switch 20 will be switched inadvertently, thereby preventing the limit switch from malfunctioning. Can be prevented. Even if the amount of bouncing is extremely large and the limit switch is switched, there will be no problem because the power switch of the hoist control circuit is turned off.

In the illustrated embodiment, the upper end of the flexible strip 18 is connected to the tip of the lever-like extension 15a because the length L of the lever on the cam operation side is the length M of the lever on the action side.
This is to make it larger to reduce the movement of the cam surface and improve the durability of the limit switch, and to make it easier to bend and extend the flexible strip 18.

According to the present invention, the operation of the outriggers is confirmed by the displacement of the center portion of the rear axle relative to the center of the vehicle body using the unsprung load of the rear wheels. The operation of the outriggers can be accurately confirmed regardless of the inclination of the vehicle, and there is no risk of failure due to frequent switching of the limit switch due to vertical vibration of the vehicle body while driving on the road.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an aerial work vehicle equipped with the device of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a front view of the main parts of a conventional outrigger. 1... Chassis frame, 2... Front wheel, 3... Rear wheel, 9... Rear axle, 10, 12... Horizontal beam, 11, 13... Hydraulic telescopic support leg, 14b...
Stopper, 15...Switch operation cam, 16...
Horizontal axis, 17...differential, 18...flexible body, 1
9...Tension spring, 20...Limit switch.

Claims (1)

[Claims for Utility Model Registration] (1) In a work vehicle equipped with outriggers on both sides, a flexible strip is provided between the center portion of the rear axle and one end of a switch actuating cam that is pivoted on a horizontal axis to the vehicle body above the center portion of the rear axle. a stopper that is connected to the body and prevents rotation of the switch actuating cam in the direction in which the flexible strip body is pulled up; a spring that always urges a corresponding portion of the switch actuating cam to engage with the stopper; Attach a limit switch to the vehicle body that can be switched by rotating the switch operating cam.
An outrigger operation confirmation device characterized in that the length of the flexible strip is set so that a limit switch is switched by a switch operation cam when the outrigger completes its operation to support a vehicle body. (2) In the outrigger operation confirmation device set forth in claim (1) of the utility model registration, one end of the switch operating cam is extended in the shape of a lever, and a flexible strip is connected to the tip of the lever-shaped extension. What I did.