Motors: expansible chamber type – With motive fluid valve – Contracting chamber exhaust valve controlled by expanding...
Patent
1991-10-02
1992-11-17
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Contracting chamber exhaust valve controlled by expanding...
51435, 51439, 1376142, F15B 1108, F15B 1304
Patent
active
051633523
ABSTRACT:
A buffer valve for a cylinder control unit includes a cylinder having first and second plungers each axially slidable in the cylinder with an intermediate piston disposed between the plungers and slidable in the cylinder with springs urging the plungers in the direction of the intermediately located piston; separate chambers are provided in the cylinder between the piston and the first and second plungers and second chambers are provided on the side of the plungers facing away from the piston; passages are provided in the first and second plungers for communicating between the first and second chambers on opposite sides of each plunger; a bypass passage connecting the first chambers for each plunger is provided with a check valve for allowing flow in only one direction from the first chamber of the first plunger to the first chamber of the second plunger so that when one of the plungers closes off communication between the bypass passage and the cylinder control unit, the check valve will prevent flow from the first chamber of the second piston.
REFERENCES:
patent: 3272085 (1966-09-01), Hajma
patent: 3795178 (1974-03-01), Roche
patent: 3857404 (1974-12-01), Johnson
patent: 3906991 (1975-09-01), Haussler
patent: 3933167 (1976-01-01), Byers, Jr.
patent: 3987705 (1976-10-01), Strassheimer
patent: 4244275 (1981-01-01), Smilges
patent: 4323095 (1982-04-01), Acerbi
Look Edward K.
Nguyen Hoang
Shin Caterpillar Mitsubishi Ltd.
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