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    • 7. 发明专利
    • ROCK CRACKING DEVICE
    • JPH09158665A
    • 1997-06-17
    • JP34542795
    • 1995-12-11
    • SHIMIZU CONSTRUCTION CO LTDNIPPON KOKI KK
    • WADA TOSHIHIKOFUKUDA KAZUHIROKAZAMA HIROSHISAKAGUCHI FUKUJUISHII TADAO
    • E21C37/10
    • PROBLEM TO BE SOLVED: To prevent the end part sides of a thrust member from being opened to excess by detecting the case where the end parts of the thrust members exceed the permissible limit positions in the separating direction by a sensor to stop the supply of oil pressure. SOLUTION: The front end surface of a base end member 11 is provided with two sensors 12 opposite to the rear ends 2a of thrust members 2. When the rear ends 2a are in the range from the standby position to the permissible limit position to the sensors put in the permissible limit position, the end surfaces of the rear ends 2a overlap the sensor 12 to be detected to be present, and a detection signal is output. A rock cracking device 1 is provided with a stop device 13 for stopping the supply of oil pressure to a rubber tube if necessary, an output signal is dispatched from the sensor 12 to the stop device 13, whereby when a detection signal of the presence is received from the sensor 12, the operation of an oil pressure supply source is not stopped. Thus, the supply of oil pressure can be stopped by the operation of the stop device 13 so as to prevent burst of the rubber tube.