Seat with relative synchronous displacement between back incline and seat incline

Abstract

The chair is of the type with mutually synchronous adjustment between back inclination and seat inclination, namely via a region between a respective zero position of back inclination (R) and seat inclination (S) and a respective maximum back inclination and seat inclination. The chair has a substructure () which is intended for placing on the floor and on which a base () is fastened rigidly. A seat support () which has a seat region and a back region is connected to the base (). Furthermore, the chair includes two backrest bows () which are deflectable differently with respect to each other and are fastened on one side to the base () and on the other side to the back region of the seat support (). The two backrest bows () are coupled independently of each other to the base () on a stationary first axis of rotation (D). The seat region of the seat support () is coupled to the base () on a stationary second axis of rotation (D). The two backrest bows () are coupled independently of each other to the back region of the seat support () on an elastically deformable third axis of rotation (D). The back region of the seat support () is twistable elastically. The seat support is covered with a cover. In the configuration as an office swivel chair, a height-adjustable pneumatic spring () on which the base () rests in order to adjust the seat support () to a height corresponding to a user's needs and in order to configure said seat support () to be rotatable about a vertical axis (V) is arranged in the substructure ().