COMPACT LINEAR ACTUATOR WITH ROTARY MECHANISM
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United States of America Patent
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Issued Date -
Feb 23, 2012
app pub date -
Aug 20, 2010
filing date -
Aug 20, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and apparatus for a compact linear actuator having an improved rotary mechanism are disclosed herein. In one embodiment, the linear actuator comprises a spline bearing for guiding the shaft of the actuator as it is linearly actuated. A rotor positioned around the spline bearing rotatably engages the spline bearing when magnetically actuated by a surrounding stator. A rotational lock connected to the piston assembly may be used to prevent the piston assembly from rotating during operation. Optionally, a rotary scale may be attached to the spline bearing in order to indicate how far the shaft has rotated. Since the shaft does not bear the mass of the rotary mechanism, linear performance of the actuator is substantially improved.
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