| 摘要 |
PROBLEM TO BE SOLVED: To form a structure unusable as a walking crane when used as a high lift work vehicle by installing a high lift work unit on the tip of an expansion boom of the walking crane. SOLUTION: A control mode of a controller 60 controlling an actuator 73 of the walking crane is switched to a crane work mode or a high lift work mode. Operation of a winch of the walking crane is regulated when switched to a high lift work vehicle mode by switching its mode under a proper condition. An operation speed of the actuator except for the winch is controlled so as to become a lower speed than an operation speed in the crane work mode. COPYRIGHT: (C)2007,JPO&INPIT
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