Title:
CONTROL CIRCUIT FOR MOTOR HYDRAULIC WORKING MACHINE
Document Type and Number:
Japanese Patent JP3389516
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve operability by exciting a solenoid switching valve to unlock with the logical product of a contact signal for unlocking a hydraulic operating system and a self-holding contact signal, in order to operate the hydraulic operating system.
SOLUTION: When a hydraulic switch 32 is turned to the lock side and a first timer relay TR1 reaches a set timer time, switch contact TR1a3 of a circuit 38 is turned on to excite a third relay R3 and a switch contact R3a is turned on to excite a fifth relay R5 to self hold a circuit 41. When the hydraulic switch 32 is turned to the unlock side, the switch contact R5a2 is turned on and a switch contact TR1a2 is turned on upon expiration of a set timer time to close and conduct a circuit 39, thus exciting a solenoid switching valve 27 to open an ion passage. Since an actuator can be operated through the action of an operation lever, operability can be improve.
Inventors:
Hiroyasu Nishikawa
Yoshihiro Ikeda
Nobuaki Matoba
Yoshihiro Ikeda
Nobuaki Matoba
Application Number:
JP34293698A
Publication Date:
March 24, 2003
Filing Date:
December 02, 1998
Export Citation:
Assignee:
New Caterpillar Mitsubishi Corporation
International Classes:
E02F9/20; E02F9/00; H02P1/32; H02P7/00; H02P29/02; (IPC1-7): H02P1/32; E02F9/00; E02F9/20
Domestic Patent References:
| JP59175388A |
Attorney, Agent or Firm:
Tetsuo Hirose
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