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Chair with variable inclination of the seat and backrest

  • US 5,584,533 A
  • Filed: 12/12/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 04/14/1993
  • Status: Expired due to Fees
First Claim
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1. A chair, comprising:

  • a bearing block;

    a seat supported on the bearing block for pivotal movement about a horizontal pivot axis located in a front region of the seat, the seat having a variable inclination defined by a pivot position of the seat relative to the bearing block;

    a backrest having a variable inclination corresponding to the variable inclination of the seat and pivotable upon a pivotal movement of the seat to a greater degree than the seat;

    a pair of spaced rocking levers for pivoting the backrest upon the pivotal movement of the seat and having, respectively, first ends for supporting the backrest on the bearing block and second ends pivotally supported on the bearing block for pivotal movement about a common axis located in a variable position relative to the pivot axis of the seat, the rocking levers being pivotally connected to the seat at a location spaced from a rear end of the seat;

    a return spring located between the bearing block and sections of the rocking levers extending between the second ends thereof and the location, at which the rocking levers are connected to the seat, for automatically returning the seat and the backrest from a working position to a neutral position upon removal of weight applied to the seat by acting on the rocking lever sections; and

    means for changing in the neutral position of the seat in which no weight is applied to the seat, a position of the return spring relative to the horizontal pivot axis of the seat for changing a returning torque applied by the return spring to the seat.

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