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Passive programmable resistance device

  • US 4,544,154 A
  • Filed: 04/26/1982
  • Issued: 10/01/1985
  • Est. Priority Date: 10/13/1978
  • Status: Expired due to Fees
First Claim
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1. A programmable resistance device comprising;

  • (a) a hydraulic cylinder;

    (b) a piston mounted in said cylinder for movement by a force applied to the piston;

    (c) a control valve for controlling the flow of hydraulic fluid from said cylinder as said piston moves and thereby controlling the amount of resistance provided to movement of the piston;

    (d) means for measuring the pressure in said cylinder to provide a first output which is a function of force applied to said piston;

    (e) means for providing a second output which is a function of the position of the piston;

    (f) drive means for controlling said valve; and

    (g) programmable means having as inputs said first and second outputs and providing a third output coupled as a control input to said drive means, said programmable means including means to store an array of desired force values versus position;

    means responsive to said second output to select one of the stored values of force for comparison; and

    means to compare said selected value with said first output and to provide said third output in accordance with the difference therebetween.

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