Directionally controlled hydraulic cylinder

Motors: expansible chamber type – With motive fluid valve – To provide unequal inlet and exhaust flow rates to single...

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91461, 91462, 91463, 91466, 91469, 921691, F15B 1108

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active

049304038

ABSTRACT:
A directionally controllable air cylinder has a set of circumferentially disposed air passages formed at each end of a closed tube. A sleeve manifold surrounds the tube and is pneumatically sealed thereto by means of a plurality of O-rings. The O-rings are positioned such that they selectively expose the sets of air passages to the manifold for receiving compressed air and to the atmosphere for venting. The direction of piston movement is determined by the set of passages exposed to compressed air. A pilot piston moves the manifold in response to a pilot air signal in one embodiment and an electrically operated solenoid moves it in another version. The manifold may also be manually or mechanically moved to operate the air cylinder. Hydraulic cylinders utilizing fluids, other than air, are also disclosed.

REFERENCES:
patent: 121364 (1871-11-01), Heath
patent: 183909 (1876-10-01), Curtis
patent: 501581 (1893-07-01), Smith
patent: 528227 (1894-10-01), Holmgren
patent: 721661 (1903-03-01), Bower
patent: 1954379 (1934-04-01), Eller
patent: 2810370 (1957-10-01), Fox et al.
patent: 3811367 (1974-05-01), Bimba
patent: 3881401 (1975-05-01), Bimba
patent: 4073311 (1978-02-01), McGeachy
patent: 4475442 (1984-10-01), Breeden
patent: 4559863 (1985-12-01), Storey

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