Motors: expansible chamber type – Relatively movable working members with one having motive... – Single valve unit controlling plural working chambers
Patent
1995-06-28
1997-04-22
Nguyen, Hoang
Motors: expansible chamber type
Relatively movable working members with one having motive...
Single valve unit controlling plural working chambers
91461, 91536, F01L 1500, F15B 1108
Patent
active
056220952
ABSTRACT:
A switching valve has a control rod with a pilot chamber at each of its ends. For each pilot chamber, there is a first passageway connected to a pressure line and communicating with the pilot chamber. A second passageway is connectable to return. A relief valve has a valve member biased to close an orifice to close communication between the pilot chamber and the second passageway. The valve member has an open position in which the pilot chamber is connected to return via the second passageway to allow shifting of the control rod. In a first embodiment, the pilot chamber is continuously in communication with pressure via the first passageway, and the valve member is opened by this pressure in response to connection of the second passageway to return. In another embodiment, the second passageway is continuously in communication with return, and the valve member is mechanically moved into its open position by an operator in response to pressure acting on the operator. A four-way directional control valve controls branch conduits leading from the switching valve to drive motors.
REFERENCES:
patent: 3922955 (1975-12-01), Kast
patent: 4561462 (1985-12-01), Hashimoto
patent: 4748894 (1988-06-01), Foster
patent: 4793469 (1988-12-01), Foster
patent: 4805515 (1989-02-01), Kast
patent: 5103866 (1992-04-01), Foster
patent: 5107753 (1992-04-01), Ioku
patent: 5193661 (1993-03-01), Foster
patent: 5361679 (1994-11-01), Foster
patent: 5375619 (1994-12-01), Foster
patent: 5390781 (1995-02-01), Foster
Nguyen Hoang
Pauly Joan H.
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