Power plants – Pressure fluid source and motor – Having condition responsive control in a system of...
Patent
1989-09-01
1991-01-15
Capossela, Ronald C.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of...
60486, 91 29, 91461, F16H 3946
Patent
active
049844270
ABSTRACT:
A control circuit for a hydraulic actuator which allows the hydraulic actuator to be operated readily without much skill and at a suitable speed in accordance with a load applied thereto. The control circuit includes a change-over valve provided intermediately of a pilot pipe line communicating with a pilot oil chamber of a hydraulic change-over valve which belongs to one of a pair of hydraulic change-over valve sets of a hydraulic operating circuit for the hydraulic actuator. The change-over valve is normally urged to a position wherein the pilot oil chamber of the hydraulic change-over valve is communicated with a tank, but is changed over, when a hydraulic pressure higher than a predetermined value acts upon a pilot oil chamber of the change-over valve, to another position in which the pilot oil chamber of the hydraulic change-over valve is communicated with the pilot pipe line. A branch pipe line branches from a pipe line for discharge oil under pressure of a hydraulic pump provided for supplying oil under pressure to the other hydraulic change-over valve set and is connected to the pilot oil chamber of the change-over valve.
REFERENCES:
patent: 3868821 (1975-03-01), Ratliff
patent: 3987626 (1976-10-01), Bianchetta
patent: 3990236 (1976-11-01), Johnson
patent: 4086767 (1978-05-01), Byers, Jr.
patent: 4367624 (1983-01-01), Ogata et al.
patent: 4405287 (1983-09-01), Kuchenbecker et al.
patent: 4476898 (1984-10-01), Krieger et al.
patent: 4528892 (1985-07-01), Okabe et al.
patent: 4534268 (1985-08-01), Yagyu et al.
patent: 4683802 (1987-08-01), Prokop et al.
patent: 4753158 (1988-06-01), Hirata et al.
Capossela Ronald C.
Kabushiki Kaisha Kobe Seiko Sho
LandOfFree
Control circuit for hydraulic actuator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control circuit for hydraulic actuator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuit for hydraulic actuator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-48253