Multiple stage, multiple extend, speed reducing ball screw linear actuator and method of constructing and operating the actuator
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United States of America Patent
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Jul 13, 2004
Grant Date -
Sep 11, 2003
app pub date -
Mar 12, 2003
filing date -
Apr 27, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiple extend ball screw and nut linear actuator incorporates a revolvable axially restrained ball screw with a ball nut thereon. A constant speed reversible drive revolves the screw to move the ball nut forwardly and rearwardly. External helical threads of the same hand as the ball nut threads are provided externally on the ball nut but have a substantially reduced lead. A second rotatably restrained nut having threads matching the external threads on the ball nut mounts on the ball nut and connects to the system to be actuated.
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