Device for Seat Tilt Adjustment of a Chair

Abstract

A device is provided for seat tilt adjustment of a chair, in particular an office chair. To provide seat tilt adjustment, which enables a particularly safe and reliable adjustment of the seat tilt, the device encompasses a base support, a seat support connected to the base support by use of a joint as well as an adjustment mechanism, which allows a selectively forward pivot movement of the seat support beyond a substantially horizontal base position.

1 . A device for seat tilt adjustment of a chair, the device comprising:
 a base support;   a joint;   a seat support connected to said base support by said joint; and   an adjustment mechanism allowing a selectively forward pivot movement of said seat support beyond a substantially horizontal base position.   
   
   
       2 . The device according to  claim 1 , wherein said joint is a swivel-slide joint. 
   
   
       3 . The device according to  claim 2 , wherein said joint includes a sliding element connected to said seat support and a sliding guide connected to said base support, said sliding element is disposed in said sliding guide. 
   
   
       4 . The device according to  claim 1 , wherein said adjustment mechanism is configured such that an operation of said adjustment mechanism effects a change of a displacement path of said seat support in said joint. 
   
   
       5 . The device according to  claim 1 , wherein said adjustment mechanism is part of said seat support. 
   
   
       6 . The device according to  claim 1 , wherein said adjustment mechanism has at least one adjustable stop element. 
   
   
       7 . The device according to  claim 6 , wherein said at least one adjustable stop element is configured for stopping against said base support. 
   
   
       8 . The device according to  claim 6 , wherein said adjustment mechanism contains a wedge gear for operating said at least one adjustable stop element. 
   
   
       9 . The device according to  claim 8 , wherein:
 said wedge gear has a driving wedge; and   said adjustment mechanism includes an operating element and a spring element, said spring element being operated by said operating element for moving said driving wedge of said wedge gear.   
   
   
       10 . The device according to  claim 9 , wherein said spring element may be operated without causing an adjustment of said at least one adjustable stop element as long as a pressure is put on said seat support. 
   
   
       11 . The device according to  claim 1 , wherein the chair is an office chair. 
   
   
       12 . The device according to  claim 6 , wherein said at least one adjustable stop element is configured for stopping against said sliding guide of said base support.