DIRECTION SELECTOR VALVE FOR PREVENTING OUT-OF-CONTROL OPERATION OF ACTUATOR

Title:

DIRECTION SELECTOR VALVE FOR PREVENTING OUT-OF-CONTROL OPERATION OF ACTUATOR

Document Type and Number:

Japanese Patent JP3248080

Kind Code:

B2

Abstract:

PURPOSE: To prevent a hydraulic motor from being operated out of control and suddenly even in the case where the spool of a remote control type direction selector valve which receives a restoration instruction signal to a neutral position does not return to a regular position, by installing a selector valve which is switched in correspondence with the operating lever of a joy stick.
CONSTITUTION: An oil passage 22a having a throttle 22b which connects a spring chamber 23 and a pump chamber 4 is formed on the valve piece 22 of the load check valve 21 of a remote control type direction selecting valve 20. The spring chamber 23 and a P port 6 are connected through a bypass 26. Further, a selector valve 27 which is switched in correspondence with the operation of the operating lever 15a at a joy stick 15 is in installed in the bypass 26.

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Inventors:

Hiroshi Kakimoto

Application Number:

JP18398391A

Publication Date:

January 21, 2002

Filing Date:

June 28, 1991

Export Citation:

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Assignee:

Kato Manufacturing Co., Ltd.

International Classes:

B66C13/20; B66F9/22; E02F9/20; E02F9/24; F15B11/08; F15B20/00; (IPC1-7): F15B11/08; E02F9/24; F15B20/00

Domestic Patent References:

JP5061734A
JP1203702A
JP28502A
JP2134402A
JP1145401A
JP1206181A
JP58113605A
JP231085A
JP1158803U
JP357507U

Attorney, Agent or Firm:

Yoshiyuki Misono

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