Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1989-02-27
1990-09-11
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91461, F15B 1108
Patent
active
049552830
ABSTRACT:
A hydraulic circuit suitable for use on power shovel or other construction machines, more specifically a hydraulic circuit for a cylinder in a hydraulic power transmission, of the type which is adapted to control pressurized oil flows to and from two oil chambers in the cylinder by switching the position of a directional control valve in communication with a pressurized oil source. The hydraulic circuit includes a logic valve provided between the directional control valve and a load-holding oil chamber in the cylinder. The logic circuit has first and second ports connected to the directional control valve and said load-holding oil chamber, respectively. A selector valve is responsive to the switching of the directional control valve to communicate a spring chamber of the logic valve with a conduit between the first port and the directional control valve in an operational phase of supplying pressurized oil to a load lowering chamber of the cylinder and to communicate the spring chamber with the second port in other operational phases.
REFERENCES:
patent: 3805678 (1974-04-01), Bianchetta et al.
patent: 4088151 (1978-05-01), Schurger
patent: 4194532 (1980-03-01), Hall
patent: 4204459 (1980-05-01), Johnson
patent: 4391183 (1983-07-01), Broms et al.
patent: 4417502 (1983-11-01), Shore
patent: 4509406 (1985-04-01), Melocik
patent: 4571941 (1986-02-01), Aoyagi et al.
patent: 4753158 (1988-06-01), Hirata et al.
Hidaka Sachio
Shibata Hiroshi
Yoshimatu Hideaki
Kabushiki Kaisha Kobe Seiko Sho
Look Edward K.
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