| 摘要 |
A pressure controlled actuator mechanism (10) is disclosed for imparting rotary control motion to devices, such as valves, having rotary control means. The actuator includes a free-floating piston (20) movably and concentrically disposed within an airtight cylindrical housing (16). A non-rotating receptacle (36), having helically spiralled recesses therein, is attached therein to a support member (30) that is adapted to move in response to the free-floating piston (20). A rotatable shaft (42), 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 (30) is spring biased to return the free-floating piston (20) to a starting position. In an alternative embodiment, the free-floating piston (20) is movably and concentrically attached to the support member (30) 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.
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