Single acting hydraulic actuator with variable return force

Details Single acting hydraulic actuator with variable return force Single acting hydraulic actuator with variable return force

1987-06-22

1988-12-20

Garrett, Robert E.

Expansible chamber devices

Resilient means interposed between working member and...

92 14, 92 25, 92 65, 251 636, F16J 110

Patent

active

047918560

ABSTRACT:
A spring operated valve actuator with variable return force includes a compact spring mechanism with a short but very powerful closing characteristic. The energy provided by the spring mechanism is applied during the entire movement of the valve, with varying forces localized according to particular needs. The spring mechanism and a movable piston member are mechanically and drivingly interconnected by a variable reduction mechanism.

REFERENCES:
patent: 2809596 (1957-10-01), Sullwold
patent: 2809667 (1957-10-01), Knapp
patent: 2989000 (1961-06-01), Alcaro
patent: 3812766 (1974-05-01), Weiss
patent: 4523516 (1985-06-01), Foster et al.
patent: 4527631 (1985-07-01), Vazquez
patent: 4552056 (1985-11-01), McKay

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