Rotary actuator device with a free floating piston

Details Rotary actuator device with a free floating piston Rotary actuator device with a free floating piston

1991-04-26

1992-12-15

Denion, Thomas E.

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

92 32, 92129, 92165R, 251 634, F01B 2526

Patent

active

051706938

ABSTRACT:
A pressure controlled actuator mechanism is disclosed for imparting rotary control motion to devices, such as valves, having rotary control means. The actuator includes a free-floating piston movable and concentrically disposed within an airtight cylindrical housing. A non-rotating receptacle, having helically spiralled recesses therein, is attached to a support member that is adapted to move in response to the free-floating piston. A rotatable shaft, one end of which mates with the helically spiralled recesses of the receptacle, is attached at its other end to a device having a rotary control means. A downward stroke of the receptacle rotates the shaft and activates the device. The support member is spring biased to return the free-floating piston to a starting position. In an alternative embodiment, the free floating piston is movably and concentrically attached to the support member for travel therewith. In this embodiment, a second pressure medium is introduced into the housing to cause the piston and support member to return to a starting position.

REFERENCES:
patent: 3975992 (1976-08-01), Cagle
patent: 4196654 (1980-04-01), Stearns
patent: 4216703 (1980-08-01), Schoeneweis
patent: 4356841 (1982-11-01), Milberger
patent: 4585207 (1986-04-01), Shelton
patent: 4744386 (1988-05-01), Frazer
patent: 4934632 (1990-06-01), Golden

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