Position sensor
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United States of America Patent
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Apr 3, 2007
Grant Date -
Jul 28, 2005
app pub date -
Jan 15, 2004
filing date -
Jan 15, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A position sensor includes a stationary frame supporting a rotatable spool onto which a cable is wound in a plurality of individual windings. A distal end of the cable extends through a lead guide for attachment to an object whose position is desired to be sensed. As the object moves, the cable is would or unwound about the spool and the spool rotates in direct correlation to the movement of the object. The spool is retained in the frame through a threaded engagement between a threaded extension extending from the spool and a threaded opening in the frame. Thus, as the spool rotates, the spool travels along a linear path and a sensor determines the location of the threaded extension to determine the location of the object. A recoil spring is used which may be located within the spool itself.
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