Actuator having both a hydraulic mode and a mechanical mode of operation
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United States of America Patent
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N/A
Issued Date -
Mar 17, 2005
app pub date -
Aug 13, 2004
filing date -
Sep 12, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to an actuator comprising a body with a cylindrical cavity, and a rod extending through one end of the cavity, being secured with a piston mounted to slide axially in the cavity so as to define therein two hydraulic chambers, the actuator including additional means for extending the rod, which comprise: means for preventing the rod from rotating relative to the body of the actuator; a nut rigidly secured to the rod; a screw extending axially inside the cavity and co-operating with the nut; a drive shaft extending axially inside the cavity and being free to turn, the screw being mounted to slide without rotation along the shaft; and rotary drive means for driving the drive shaft.
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