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Constant force generator mechanism and adjustable seat constructed therewith

  • US 4,387,876 A
  • Filed: 07/01/1981
  • Issued: 06/14/1983
  • Est. Priority Date: 05/05/1979
  • Status: Expired due to Fees
First Claim
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1. A constant force generator mechanism, comprising:

  • a rigid first link adapted to be fixed to a support;

    a rigid second link mounted for pivotable movement to said first link by a first hinge joint; and

    a spring link hingedly mounted to said first link by a second hinge joint, and hingedly mounted to said second link by a third hinge joint;

    said spring link having a linear spring rate and zero free length whereby, upon pivoting the second link with respect to the first link, the spring link generates a force whose component parallel to the first link at any given point on the second link is constant through the entire range of pivotable movement of the second link, said second hinge joint being adjustable on said first link to vary the magnitude of the generated force.

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