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Chair control

  • US 5,320,410 A
  • Filed: 01/14/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 01/14/1992
  • Status: Expired due to Term
First Claim
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1. A chair, comprising:

  • a chair seat;

    a chair back operably interconnected to said chair seat for relative rearward movement; and

    a flexible truss operably connected to and interconnecting said chair back and seat for supporting said chair back during said rearward movement, comprising;

    a first elongate spring means for absorbing energy having a length and shape that extends from said chair seat to said chair back, said first elongate spring means being attached to said chair seat and chair back and controlling the rearward movement of said chair back, said first spring means being resiliently flexible and defining a first torque versus displacement profile;

    a second elongate spring means for absorbing energy having a length and shape corresponding to said first elongate spring means so that said second elongate spring means also extends from said chair seat to said chair back, said second spring means being resiliently flexible and defining a second torque versus displacement profile, said second spring means being spaced a distance from said first spring means such that at least a part of said first and second spring means slidingly move longitudinally with respect to each other during flexing; and

    means for operably interconnecting said first and second spring means along said lengths including locations proximate the ends of said spring means in an interactive arrangement so that said first and second profiles combine to define a desired torque versus displacement profile, said first and second spring means being fixed to each other at one location, but being relatively movable at other locations so as to define the desired torque versus displacement profile as said chair back is moved relative to said chair seat.

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