Locking cylinders

Details Locking cylinders Locking cylinders

1978-03-02

1980-04-29

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

180 8915, F15B 1108, F15B 13042

Patent

active

042000319

ABSTRACT:
Disclosed are two embodiments of a locking cylinder. In both embodiments the locking cylinder comprises a housing, a working piston, a pilot piston, and a counter balance valve to substantially smoothen the operation of the working piston, particularly when an induced pressure is applied to the working piston. In the first embodiment, the pilot piston slides as a unit, although it may be formed in two axially separate parts. In the second embodiment, the pilot piston is formed in two axially separate parts, communicating bores are formed in the two parts, a ball valve is located in the bore in one of the parts, a free floating pin is disposed in the bores between the ball valve and an abutment surface in the other part, and the ball valve is biased shut. The pin is sized to unseat the ball valve when the two parts are in contact, but the two parts are biased apart by the action of the biasing means, which is transmitted through the pin to the abutment surface.

REFERENCES:
patent: 2653626 (1953-09-01), Finlayson
patent: 2869327 (1959-01-01), Symmank
patent: 3411521 (1968-11-01), Johnson
patent: 3523490 (1970-08-01), Bianchetta
patent: 3665810 (1972-05-01), Parrett
patent: 3748968 (1973-07-01), Pinto
patent: 3801151 (1974-04-01), Reynolds
patent: 3975987 (1976-08-01), Panis

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