JPH0449018Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field The present invention relates to an outrigger activation warning device that warns that the outrigger is activated in a crane vehicle or an aerial work vehicle equipped with an outrigger. .

(2) Conventional technology A device that detects the extension and grounding of outriggers and turns on or blinks an indicator light was developed in Utility Model 62-110061.
This method is conventionally known as described in Japanese Patent Application No.

(3) Problems to be solved by the invention However, since the conventional device activated the indicator light by detecting when the outrigger extended beyond a predetermined length and when it touched the ground, There was a danger that workers or passersby would be hit by or caught in the outrigger.

(4) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a device that is fixed to the tip of the spool of the outrigger operating valve that controls the operation of the outrigger and is linked to the switching operation of the outrigger operating valve. A limit switch that is activated by the cam when the outrigger operating valve is switched from the neutral position to the operating position, and an alarm around the outrigger that is activated by a signal from the limit switch. be.

(5) Effect With the above configuration, when the outriggers are extended, grounded, or retracted, the limit switch is activated in conjunction with the switching of the outrigger operating valve to the activated position, and a signal from this limit switch activates the outrigger surroundings. When the alarm goes off and the outriggers stop working,
By switching the outrigger operating valve to the neutral position, the limit switch will not operate and the alarm will also stop operating.

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

As shown in FIG. 2, in the outrigger hydraulic circuit, the outrigger operation valve 3 to which the discharge oil of the pump 2 is supplied is composed of four sub-valves 31, 32, 34, 35 and one main valve 33, and each The sub valves 31, 32, 34, 35 are connected to the bottom sides of the outrigger overhang cylinders 41, 42, 44, 45 and the jack cylinders 51, 52, 54, 55, respectively, and the main valve 33 is connected to the overhang cylinders 41, 42, 44. , 45 and the rod side of the cylinders 51, 52, 54, 55, the sub valves 31, 32, 34, 35
By switching the overhang cylinders 41, 4
2, 44, 45 or jack cylinder 51,
Select 52, 54, 55 and open the main valve 33.
By switching, the selected extended cylinder 41, 42, 44, 45 or jack cylinder 51, 52, 54, 55 is expanded or contracted, and the outrigger is activated.

As shown in FIG. 1, a cam 6 that reciprocates in conjunction with the spool is fixed to the tip of the spool of the main valve 33 of the outrigger operating valve 3 as a detector for detecting the operating state of the outrigger. A limit switch 7 is provided on the side, which is operated by a cam 6 when the main valve 33 is switched from the neutral position, and a battery 8 and a buzzer 9 serving as an alarm are connected to the limit switch 7, respectively. When the main valve 33 is switched from the neutral position to the operating position, the limit switch 7 is operated by the cam 6 and becomes "closed".
Buzzer 9, which is an alarm, sounds.

With the above configuration, the sub-valve 31 of the outrigger operation valve 3,
32, 34, 35 are extended cylinders 41, 42,
44, 45 side and then switch the main valve 33 to the extension side, the overhang cylinder 4
1, 42, 44, 45 are extended, the outriggers are extended to the left and right of the vehicle body, the buzzer 9 continues to sound, and after the outriggers are extended, the sub valves 31, 32, 34, 35 are moved to the jack cylinder 5.
1, 52, 54, and 55 side, and then switch the main valve 33 to the extension side, the jack cylinders 51, 52, 54, and 55 extend, and the outriggers extend downward to support the vehicle body. , Buzzer 9 continues to sound.

When retracting the outriggers from the installed state, the jack cylinders 51, 52, 54, 55
When contracting and extending cylinders 41, 42, 44,
45, the buzzer 9 continues to sound due to switching of the main valve 33.

(7) Effects of the invention As described above, according to the invention, when the outriggers are extended, grounded, or retracted, an alarm is always issued while the outriggers are operating. An outrigger activation warning device is provided that eliminates the risk of workers or passersby being hit by or caught in the outriggers.
The present invention is effective in improving the safety of work vehicles equipped with outriggers.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing the configuration of an outrigger activation warning device, and FIG. 2 is a hydraulic circuit diagram of the outrigger. 3... Outrigger operation valve, 6... Cam, 7...
Limit switch (detector), 8...Battery,
9...Buzzer (alarm), 31, 32, 34, 3
5...Sub valve, 33...Main valve.

Claims (1)

[Scope of utility model registration request] The cam is fixed to the tip of the spool of the outrigger operating valve that controls the operation of the outriggers and moves back and forth in conjunction with the switching operation of the outrigger operating valve, and the cam is activated when the outrigger operating valve is switched from the neutral position to the operating position. What is claimed is: 1. An outrigger activation warning device comprising: a limit switch that operates in response to a signal from the limit switch; and an alarm around the outrigger that is activated by a signal from the limit switch.