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Chair tilting mechanism

  • US 5,423,594 A
  • Filed: 10/06/1994
  • Issued: 06/13/1995
  • Est. Priority Date: 05/21/1991
  • Status: Expired due to Fees
First Claim
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1. A chair tilting mechanism comprising:

  • a) a fixed support having means for connection to a ground-engaging part of a chair;

    b) a seat support having means for supporting a seat for the chair;

    c) a first pivot connection between the seat and fixed supports;

    d) a backrest support having an upper end and a lower end;

    e) a second pivot connection between the backrest and seat supports, said pivot connection being located rearwardly of the first pivot connection and having a pivot axis which is substantially parallel to that of the first pivot connection;

    f) biasing means mounted between the fixed and seat supports, said biasing means acting between anchorages on the fixed and seat supports which are located forwardly of the first pivot connection;

    g) a single elongate link member having means for forming pivot connections at opposite ends thereof;

    h) a third pivot connection between one end of said link member and the backrest support; and

    i) a fourth pivot connection between the opposite end of said link member and the fixed support, said third and fourth pivot connections completing interconnection of the fixed, seat and backrest supports for synchronized tilting of the seat support with respect to the backrest support.

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