| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic circuit of a crasher capable of smoothly performing gyrating, opening and shutting movements in a simple structure. SOLUTION: The hydraulic circuit 1 is provided with an opening and closing oil pressure pipes 51 and 52 for supplying working oil to a hydraulic cylinder 37 provided for opening and closing of arms 38a and 38b of the crasher, and oil pressure pipes 53 and 55 for gyrating supplying working oil to a hydraulically-powered motor 18. A gyrating direction control means 67 comprising a pilot control valve 60 and a pilot pipes 68 and 70, and a shock pressure bypassing means 61 are arranged on a midway of the oil pressure pipes 53 and 55 for gyrating. When shocks are given to the hydraulically-powered motor 18 by smashing the crasher 2 onto a wall surface, the working oil flows through the pilot pipes 68 and 70, and a position of the pilot control valve 60 is switched. COPYRIGHT: (C)2004,JPO
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