Synchronizing mechanism for a chair

Abstract

A synchronizing mechanism for a correlated seat/backrest movement of an office chair has a base carrier, which can be placed on a chair column, a seat carrier and a backrest carrier. In order to provide a synchronizing mechanism in which there is no need to adjust a spring force in order to change the “pivoting resistance” of the backrest, the backrest carrier, which can be pivoted about a transverse spindle, is connected on the one hand to the base carrier, via a first link, and on the other hand to the seat carrier, via a second link, such that a pivoting movement of the backrest in the rearward direction induces a raising movement of the rear region of the seat carrier, and that the seat carrier is connected to the base carrier such that a raising movement of the forward region of the seat carrier takes place at the same time. A basic idea of the invention is that the user of the office chair “raises” itself upwards by subjecting the backrest itself to loading.

1 . A synchronizing mechanism for a correlated seat/backrest movement of a chair, comprising:
 a base carrier configured for placement on a chair support;   a seat carrier having a rear region and a forward region;   a backrest carrier pivotally mounted about a transverse axis;   a first link connecting said backrest carrier to said base carrier and a second link connecting said backrest carrier to said seat carrier, such that a pivoting movement of said backrest carrier in a rearward direction induces a raising movement of said rear region of said seat carrier, and wherein said seat carrier is connected to said base carrier such that a raising movement of said forward region of said seat carrier takes place at the same time.   
     
     
         2 . The synchronizing mechanism according to  claim 1 , which further comprises a guide connecting said base carrier to said seat carrier. 
     
     
         3 . The synchronizing mechanism according to  claim 2 , wherein said guide is a linear guide. 
     
     
         4 . The synchronizing mechanism according to  claim 2 , wherein said guide is disposed in said forward region of said seat carrier. 
     
     
         5 . The synchronizing mechanism according to  claim 1 , wherein said first link includes a pivot bearing forming a pivoting connection to said base carrier, and said first link has a first link end articulated to said seat carrier and an opposite, second link end articulated to said backrest carrier. 
     
     
         6 . The synchronizing mechanism according to  claim 1 , wherein at least one of said first link and said second link is covered in an outward direction by a part of said backrest carrier and/or a part of said seat carrier.