Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1987-12-21
1988-09-27
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91401, 180146, 92 13, 92 135, 92 136, 92181P, F15B 910
Patent
active
047733039
ABSTRACT:
An apparatus for readjusting first and second adjustable pressure relief poppet valves to vent the fluid pressure moving a piston when the piston is at the ends of a second work stroke which is of a length less than a first work stroke for which the poppet valves are adjusted. Each of the poppet valves is carried by the piston and includes a valve seat and a valve member movable relative to the valve seat. The piston is disposed in a fluid chamber defined by a housing. The piston divides the fluid chamber into first and second chamber portions. One of the chamber portions is pressurized and the other is vented to move the piston in a work stroke. The apparatus includes a member supported by the housing for moving the seat of the second poppet valve outwardly relative to the piston in response to the member moving relative to the housing and engaging the seat of the first poppet valve to move the seat of the first poppet valve inwardly relative to the piston. The piston moves to one end of the second work stroke to engage the seat of the second poppet valve with a surface defining the fluid chamber to move the seat of the second poppet valve inwardly relative to the piston to an adjusted position enabling fluid communication between the first and second chamber portions when the piston is at the one end of the second work stroke.
REFERENCES:
patent: 3315570 (1967-04-01), Brewer et al.
patent: 3896703 (1975-07-01), Bertanza
patent: 3935790 (1976-02-01), Goff
patent: 4028996 (1977-06-01), Jablonsky
patent: 4625624 (1986-12-01), Adams
patent: 4648307 (1987-03-01), Rabe
U.S. application Ser. No. 073,711, filed Jul. 15, 1987, Inventors: William T. Rabe and Wendell L. Gilbert, for "Steerig Gear".
Garrett Robert E.
TRW Inc.
Williamson Mark A.
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