Title:
ANTITHEFT DEVICE FOR CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP3679042
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an antitheft device not allowing a locked state of an actuator to be easily released without operating an input device.
SOLUTION: A solenoid controlled selector valve 13 is interposed between two pilot lines 18 and 19 connected with pilot ports 10a and 10b of a control valve 10. If a signal is not inputted in a solenoid 13b, pilot oils of the two pilot lines 18 and 19 communicate and they are returned to a tank 17. Accordingly, the pilot oil is not supplied to the pilot port 10a or 10b of the control valve 10, and it becomes a locked state unable to operate the actuator. If the input device 15 is operated, a predetermined lock release signal is inputted from a controller 14 to the solenoid 13b, the selector valve 13 is changed over to an cut off position, the pilot oil is supplied to the pilot port 10a or 10b, and operation of the actuator becomes possible.
Inventors:
Toshiyuki Imai
Application Number:
JP2001308575A
Publication Date:
August 03, 2005
Filing Date:
October 04, 2001
Export Citation:
Assignee:
Sumitomo Construction Machinery Manufacturing Co., Ltd.
International Classes:
E02F9/20; B60R25/01; B60R25/04; B60R25/23; E02F9/24; E05B83/00; E05B83/16; E05B83/36; (IPC1-7): E02F9/20; B60R25/00; B60R25/04; E02F9/24; E05B65/12
Domestic Patent References:
| JP9050584A | ||||
| JP9013431A | ||||
| JP2000255981A | ||||
| JP63011728A | ||||
| JP11021079A |
Attorney, Agent or Firm:
Takakichi Hayashi