Linear actuator with speed controlling brake
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United States of America Patent
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Mar 21, 1995
Grant Date -
N/A
app pub date -
Feb 19, 1993
filing date -
Feb 19, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An actuator suitable for use as an ejection jack for deploying an aircraft mounted ram air turbine is provided. The actuator utilizes a spring powered ballscrew operatively coupled to a centrifugally actuated brake in such a manner that the brake limits the speed of reciprocating movement of the ballscrew. The problems of fluid leakage and slow deployment at cold temperatures, often encountered in prior ejection jacks utilizing hydraulic dashpots for speed control, are thus eliminated. The actuator also includes a locking device for locking the actuator in either an extended or a retracted position. Features are also provided for attaching an external drive mechanism in a manner allowing the ballscrew to be utilized for resetting the actuator to an initial non-extended position.
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