| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an anti-theft device of a construction machine for shutting off the supply of pressure oil to a traveling device in order not to enable to travel only by attaching a simple device without a wide space. <P>SOLUTION: In a hydraulic circuit of a construction machine, a top revolving superstructure is revolvingly installed on a bottom traveling body having a traveling device, and a main pump, a traveling direction switch valve, and a remote-control valve for switching the traveling direction switch valve are installed to the top revolving superstructure. A rotary joint is installed in the middle of a conduit line connecting the top revolving superstructure with the bottom traveling body. The direction switch valve is built in the rotary joint, and the pressure oil to the traveling device of the bottom traveling body is shut off by switching the direction switch valve, to prevent theft of the construction machine. <P>COPYRIGHT: (C)2004,JPO</p> |
