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Chair control for a pedestal chair having a knee-tilt seat

  • US 4,906,045 A
  • Filed: 03/20/1989
  • Issued: 03/06/1990
  • Est. Priority Date: 03/20/1989
  • Status: Expired due to Fees
First Claim
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1. A chair control for a pedestal chair having a knee-tilt seat, a chair post tube and a housing extending between said knee-tilt seat and said chair post tube, said chair control including:

  • a seat support pivot member pivotally mounted on said housing for rotation about a generally horizontal axis located forward of said chair post tube,means mounted on said seat support pivot member for supporting said seat,a torsion spring means mounted on said housing rearwardly of said seat support pivot member for rotation about a generally horizontal axis,cam follower means and an arm having cam surface means, one of said means and said arm attached to one of said seat support pivot means and said torsion spring means, with said cam surface means engaging said cam follower means to bias said seat support pivot member to tilt said seat forwardly,one of said arms having cam surface means and cam follower means extending non-axially relative to the horizontal axis of rotation of its means,the engagement between said cam follower means and said cam surface means moving farther away from the horizontal axis of rotation of its means as said support pivot member rotates from its unoccupied position to its fully rearwardly-tilted position to thereby effectively decrease the force exerted by said torsion spring means against said seat support pivot member.

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  • 9 Assignments
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