Machine element or mechanism – Automatic operation or control
Patent
1980-09-05
1982-09-21
Myhre, Charles J.
Machine element or mechanism
Automatic operation or control
91416, 188170, 188 69, 123198D, F16H 548
Patent
active
043500536
ABSTRACT:
A movable member, including a first piston in a hydraulic cylinder, is biased toward a first position by a reset spring and toward a second position by a trip spring which is compressed between the first piston and a second piston in the same cylinder. The second piston is disposed for limited floating movement relative to said movable member. Hydraulic fluid under pressure is admitted into a first chamber between the first piston and the adjacent end of the cylinder, and a constricted fluid passage in the movable member enables the hydraulic fluid to flow between the first chamber and a second chamber defined by the second, floating piston and the other end of the cylinder. With equal, relatively high fluid pressure in both chambers, the trip spring is charged and the movable member is held by the reset spring in its first position. An abrupt loss of fluid pressure in the first chamber causes the movable member to be quickly moved by the trip spring to its second position, whereas a gradual loss of fluid pressure results in movement of the second, floating piston in a direction that discharges the trip spring while the movable member remains in its first position.
REFERENCES:
patent: 2580596 (1952-01-01), Richardson
patent: 3020094 (1962-02-01), Murty
patent: 3543603 (1970-12-01), Gley
patent: 3613515 (1971-10-01), Swander
patent: 3760785 (1973-09-01), Harrison
patent: 3853110 (1974-12-01), van der Merwe
patent: 3923020 (1975-12-01), Gilligan
patent: 4108129 (1978-08-01), Rognon
General Electric Company
Miller Carl Stuart
Myhre Charles J.
Richardson, Jr. Albert S.
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