×

Chair having adjustable synchronous tilting

  • US 5,931,531 A
  • Filed: 09/21/1998
  • Issued: 08/03/1999
  • Est. Priority Date: 01/23/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A chair having adjustable synchronous tilting, comprising:

  • a base support;

    a seat having a means for pivotably mounting said seat to said base support about a horizontal seat pivot axis, said seat having a normal position and a tilted position which define a first pivot angle, said seat having at least one guide means that is substantially horizontal when said seat is in said normal position;

    a back rest support having a means for pivotably mounting said back rest support to said base support about a horizontal back rest support pivot axis, said back rest support having a normal position and a tilted position which define a second pivot angle, said back rest support having at least one guide means that is substantially horizontal when said back rest support is in said normal position;

    wherein a synchronous tilting ratio is defined by the ratio between said first pivot angle and said second pivot angle;

    a back rest which is attached to said back rest support;

    at least one coupling link means, each said coupling link means having an upper pivot engaging at least one said seat guide means, said upper pivot being displaceably guided in said seat guide means, and a lower pivot engaging at least one said back rest support guide means, said lower pivot being fixed in relation to said upper pivot and displaceably guided in said back rest support guide means;

    at least one adjusting means for displacing and fixing a position of said coupling link upper pivot along said seat guide means and said coupling link lower pivot along said back rest support guide means; and

    a means for urging said seat and said back rest support toward said normal position from said tilted position;

    wherein said synchronous tilting ratio is adjustably determined by the displacement of said seat pivot axis and said back rest support pivot axis from said coupling link upper pivot engagement and said coupling link lower pivot engagement, respectively, as established by said adjustment means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×