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Tilting seat and back chair, particularly tilting desk chair

  • US 4,682,814 A
  • Filed: 11/01/1984
  • Issued: 07/28/1987
  • Est. Priority Date: 05/06/1983
  • Status: Expired due to Fees
First Claim
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1. Chair having a tilting seat and tilting back, especially tilting desk chair, includinga support structure (1);

  • a seat (2) having a forward and a rear edge zone;

    front connection means (3) pivotably connecting the forward edge zone of the seat to the support structure (1);

    a chair back (4) having an upper portion and a lower portion;

    an attachment arm (5) extending from the lower portion of the chair back (4) to a zone beneath the seat, and having two spaced pivot connection means (6,

         9),a first pivot connection means (6) being located adjacent to or below the seat and positioned forwardly of a plane containing the upper portion of the chair back and pivotably connecting the attachment arm (5) and the seat (2), a second pivot connecting means (9) being located below the level of the seat and below said first connection means coupled to a guide means;

    said guide means (10, 10'"'"') coupling the attachment arm (5) to the support structure (1) for changing the inclination of the chair back (4) with respect to the support structure, while simultaneously changing the position of the seat (2) with respect to the support structure (1);

    lockable positioning-and-force means (7) attached to the support structure (1) and coupled to the arm (5) in the region of the second pivot connection means (9) and selectively providing a force on the seat (2) and on the chair back (4) to bias the back in an upright position, or permit locking of the seat and the chair back in a position of inclination selected by a user,and wherein the guide means (10, 10'"'"') is coupled to the attachment arm (5) and hence to the chair back (4) at a position spaced from said first pivot means (6),said guide means further being coupled to the support structure (1) for guiding the movement of the attachment arm (5) and hence relating, via said first pivot means (6), conjoint tilting movement of the seat (2) and of the chair back (4) as determined by the guide means,the attachment arm (5) forming a rigid connection between said first and said second spaced pivot connection means (6,

         9) and providing a coupling between the chair back (4) and the seat (2) while permitting said conjoint tilting movement of the seat and of the chair back.

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