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Hydraulic cylinder with position encoder

  • US 20020157531A1
  • Filed: 04/15/2002
  • Published: 10/31/2002
  • Est. Priority Date: 11/06/1996
  • Status: Abandoned Application
First Claim
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1. An actuator having a cylinder and a piston assembly moveable within said cylinder, said piston assembly projecting from said cylinder and having a surface that presents to a predetermined location on said cylinder a periodically varying discernible characteristic as said surface moves relative to said cylinder, and a sensor assembly to monitor said discernible characteristic and measure changes therein to provide an indication of movement of said piston assembly relative to said cylinder, said varying discernible characteristic being provided by an interface on said piston assembly exhibiting a change in said discernible characteristic, said interface being inclined to the direction of travel of the rod whereby the distance between said interface and said transducer varies progressively and continuously as said piston assembly moves relative to said cylinder.

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