| 摘要 |
PROBLEM TO BE SOLVED: To prevent a vehicle from runaway while surely preventing the vehicle from tumbling by automatically stopping a jack in a prescribed length, in case of supporting the vehicle by the jack with a roller grounded. SOLUTION: This jack operation control device for a work vehicle is constituted by providing a vehicle having a wheel to be capable of running, a plurality of jacks arranged in a side part of the vehicle to support it, a roller journaled to a lower end part of the jack to be capable of being grounded, a jack base having a grounding plate to freely move selectively between a plate grounded position covering a lower surface of the roller and a refuge taken position exposing the lower surface of the roller, a grounding plate position detection means detecting the grounding plate for whether it is positioned in the plate grounded position or the refuge taken position, and an extending operation control means regulating extending operation of a prescribed length or more of the jack in the case that the grounding plate is positioned in the refuge taken position. COPYRIGHT: (C)2003,JPO
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