| 摘要 |
PROBLEM TO BE SOLVED: To provide a safety device capable of notifying an operator of fluctuation of a load acting on front wheels and rear wheels. SOLUTION: This safety device 60 is constituted of a first reaction detecting sensor 61, a second reaction detecting sensor 62, a third reaction detecting sensor 63 and a fourth reaction detecting sensor 64 respectively fixed on a pair of front jacks arranged on the vehicle front side and a pair of rear jacks arranged on the vehicle rear side, for detecting grounding reaction, and a controller 67 calculating the front wheel load and the rear wheel load acting on the front wheels and the rear wheels in a grounding state according to the values detected by four reaction detecting sensors and sounding an alarm buzzer 79 when at least any of the calculated values is below a previously set wheel load value, in a working and running state in which the front wheels and the rear wheels are grounded and that rotation rollers fixed on lower parts of the front jacks and the rear jacks are also grounded. COPYRIGHT: (C)2004,JPO
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