Expansible chamber devices – With separate biasing means for working member – Biasing means maintains working member intermediate stroke...
Patent
1975-07-21
1976-11-16
Maslousky, Paul E.
Expansible chamber devices
With separate biasing means for working member
Biasing means maintains working member intermediate stroke...
92 13, 92164, F01B 3100
Patent
active
039916618
ABSTRACT:
A three position fluid powered actuator including a cylinder having a first end, a second end and an intermediate plate, the first end and intermediate plate having coaxial openings therein, a piston reciprocally positioned within the cylinder between the second end and the intermediate plate, a piston rod affixed to the cylinder and sealably and slidably received in the opening in said first end. The piston rod has a reduced diameter portion between said cylinder first end and the intermediate plate. Positioned on the reduced diameter portion of the piston rod is a pair of spring followers each abutting against the shoulder formed at each end of the intermediate portion and between the followers is a compressed spring. When fluid pressure is applied to the cylinder to either side of the piston, the piston is moved, compressing the spring. When the fluid pressure is removed, the spring returns the piston to the intermediate position. The device thereby may be termed a "three position" actuator since it can be moved to two different positions by the application of fluid pressure and automatically is moved back to an intermediate position by the positive action of the spring when fluid pressure is removed.
REFERENCES:
patent: 2092580 (1937-09-01), Kelley
patent: 3168854 (1965-02-01), Neilson
patent: 3537355 (1970-11-01), Bliss
Air Power Systems Company, Inc.
Maslousky Paul E.
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