| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an emergency moving-down device for a movable cab, workable without pulling a high-pressure system hydraulic line into the cab and capable of avoiding such an event that the cab cannot be moved down because of a trouble of an electric system. <P>SOLUTION: In an emergency moving-down device for a movable cab, an accumulator 50 is provided for accumulating discharge oil from a pilot hydraulic pump 35 of a work machine, and an emergency selector valve 44 is provided in a pipeline between a bottom chamber 30a of a hydraulic cylinder 30 which moves up and down the cab and an oil tank 48. The emergency selector valve 44 can select an interruption position for interrupting the bottom chamber 30a from the oil tank 48 or a communication position for communicating the bottom chamber 30a with the oil tank 48. A manual operation valve 53 for the emergency selector valve 44 is provided in the cab. With the manual operation of the manual operation valve 53, pilot pressure oil in the accumulator 50 is supplied to a hydraulic operation chamber 44a of the emergency selector valve 44 to allow the emergency selector valve 44 to select the communication position. <P>COPYRIGHT: (C)2013,JPO&INPIT |
