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Position sensor

  • US 7,197,974 B2
  • Filed: 01/15/2004
  • Issued: 04/03/2007
  • Est. Priority Date: 01/15/2004
  • Status: Active Grant
First Claim
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1. A position sensor for sensing the position of a piston movable within a cylinder comprising:

  • a frame;

    a spool rotatably mounted to the frame;

    a cable windable about the spool and having a distal end adapted to be affixed to the piston, wherein the spool rotates as the cable winds and unwinds in relation to the movement of the piston, said spool operable to travel along a substantially linear path in response to the rotational movement of the spool;

    and a sensing means adapted to sense the position of the spool along its substantially linear path, wherein the sensing means includes a transducer mounted to the exterior of the frame and operably disposed to a target magnet movable in cooperation with the movement of the spool.

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