| 摘要 |
PROBLEM TO BE SOLVED: To provide a confirming device for directly confirming the advance of an expansion blade in a cylinder type expansion head and performing reliable confirmation even with a leakage of a pressure fluid. SOLUTION: In a working tool operation confirming device in a hydraulic working tool driving device for an excavating work rod, a working tool for performing predetermined work is mounted to the outside of a lower end of the excavating work rod so as to be freely reciprocated into an advance working position from a retreat position. A hydraulic driving means for driving the working tool is mounted inside the lower end of the excavating work rod. The hydraulic driving means is provided with an interlocking mechanism having a driver driven in a reciprocating manner from a starting point to an end point by the pressure fluid supplied from the outside through a supply passage, and putting the working tool in reciprocating operation from the retreat position to the advance working position by the reciprocating motion of the driver from the starting point to the end point. The hydraulic driving means is further provided with a discharge port for discharging the pressure fluid to the outside of a system when the driver reaches the end point to operate the working tool into the advance working position, and a manometer for detecting a pressure drop in the pressure fluid supply passage. COPYRIGHT: (C)2006,JPO&NCIPI
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