Patent ID: 8528973

Claim:
An adjusting mechanism for setting a restoring force acting on a backrest of a chair, the adjusting mechanism comprising: a spring element for generating the restoring force; a support having a support pin; a backrest support mounted on said support such that said backrest support can be pivoted about said support pin; an adjusting element configured in a manner of scissors having a first scissor arm, a second scissor arm, a setting pin and a scissor pin, said first and second scissor arms connected to one another such that they can be rotated about said scissor pin, said first scissor arm mounted on said backrest support such that said first scissor arm can be pivoted about said setting pin, a spring force acting on said second scissor arm from said spring element; and a setting element, a first active lever length being defined between said support pin and said scissor pin, said first active lever length can be changed with an aid of said setting element for setting the restoring force by pivoting of said adjusting element about said setting pin, said first active lever length being set and therefore the restoring force being set, such that both are constant during inclination of the backrest.