Synchronization Mechanism

Abstract

A synchronization mechanism for a correlated movement of a seat and a backrest of an office chair contains a basic support placeable on a chair post, a seat support and a backrest support. To provide a synchronization mechanism for which an adjustment of a spring tension to change the “tilting resistance” of the backrest is not required, a mechanism is proposed whereby the backrest support that is pivotable around a swivel axis is directly linked in a pivotable manner to the basic support, and to the rear end section of the seat support, such that a backward tilt of the backrest induces a lifting of the rear area of the seat support. The seat support is so linked to the basic support as to cause a lifting of the front area of the seat support when the user of the office chair “lifts” him/herself up by leaning against the backrest.

1 . A synchronization mechanism for a correlated movement of a seat and a backrest of an office chair, the synchronization mechanism comprising:
 a basic support placeable on a chair post;   a seat support having a rear end section; and   a backrest support pivotable around a lateral axis and directly linked in a pivotable manner to said basic support and to said rear end section of said seat support, such that a backward tilt of said backrest support induces a lifting of a rear area of said seat support and said seat support linked to said basic support as to cause a simultaneous lifting of a front area of said seat support during the backward tilt of said backrest support.   
   
   
       2 . The synchronization mechanism according to  claim 1 , further comprising a guiding connecting said basic support to said seat support. 
   
   
       3 . The synchronization mechanism according to  claim 2 , wherein said guiding is a linear guiding. 
   
   
       4 . The synchronization mechanism according to  claim 1 , wherein, as seen in a longitudinal direction of the office chair, a swivel axis of a connection of said backrest support to said basic support is fitted behind a hinge axis of a connection of said backrest support to said seat support.