Seat Mechanism for an Item of Seating Furniture, in Particular Office Swivel Chair

Abstract

A seat mechanism for an item of seating furniture, in particular a chair, has a movable seat carrier and a backrest carrier, which are mounted on a main carrier. The backrest carrier can be pivoted about a horizontal pivot axis counter to the action of a force accumulator, and the seat carrier and the backrest carrier are coupled to each other. A lifting mechanism is provided. The lifting mechanism converts pivoting of the backrest carrier into a lifting movement of the seat carrier. A seat mechanism is provided with a weight-dependent resetting force for the backrest. The seat mechanism is distinguished by a simple construction in which the weight can be utilized efficiently. To increase the comfort, the seat is lowerable in the rear region and the resetting force is adjustable by means of a second force accumulator.

1 . Seat mechanism for an item of seating furniture with a movable seat carrier and a backrest carrier, which are mounted on a main carrier, wherein the backrest carrier can be pivoted about a horizontal pivot axis counter to the action of a force accumulator, and the seat carrier and backrest carrier are coupled to each other, characterized by a lifting mechanism which converts pivoting of the backrest carrier into a lifting movement of the seat carrier. 
     
     
         2 . Seat mechanism according to  claim 1 , characterized in that the lifting mechanism has levers which connect the seat carrier to the main carrier. 
     
     
         3 . Seat mechanism according to  claim 1 , characterized in that the force accumulator has at least one leg spring which acts at one end on the backrest carrier and at the other end on the main carrier. 
     
     
         4 . Seat mechanism according to  claim 1 , wherein the seat can be lowered in the rear region. 
     
     
         5 . Seat mechanism according to  claim 1 , wherein the seat has a flexible seat cushion carrier with a web in the central region. 
     
     
         6 . Seat mechanism according to  claim 5 , wherein the seat cushion carrier has, in the side region, slots which run from the edges toward the center. 
     
     
         7 . Seat mechanism according to  claim 6 , wherein the slots are arranged in the center to rear region of the seat cushion carrier. 
     
     
         8 . Seat mechanism according to  claim 6 , wherein the slots become shorter in length with increasing distance from the rear edge of the seat cushion carrier. 
     
     
         9 . Seat mechanism according to  claim 1 , characterized by a second force accumulator which acts at one end on the seat carrier and at the other end on the main carrier. 
     
     
         10 . Seat mechanism according to  claim 9 , characterized in that the action of the second force accumulator is adjustable. 
     
     
         11 . Seat mechanism according to  claim 9 , characterized in that the second force accumulator is arranged pivotably. 
     
     
         12 . Seat mechanism according to  claim 11 , characterized in that the second force accumulator is mounted at one end in a pivot axis and at the other end on a curved guide. 
     
     
         13 . Seat mechanism according to  claim 1 , characterized by an inclination device for lowering the front edge of a seat mounted on the seat carrier, and a resetting device which inevitably cancels the lowering upon a lifting movement of the seat carrier. 
     
     
         14 . Seat mechanism according to  claim 13 , characterized in that the resetting device has at least one lever which acts at one end on the main carrier and at the other end on the seat carrier. 
     
     
         15 . An office swivel chair, with a seat mechanism according to  claim 1 . 
     
     
         16 . Seat mechanism according to  claim 2 , characterized in that the force accumulator has at least one leg spring which acts at one end on the backrest carrier and at the other end on the main carrier. 
     
     
         17 . Seat mechanism according to  claim 2 , wherein the seat can be lowered in the rear region. 
     
     
         18 . Seat mechanism according to  claim 3 , wherein the seat can be lowered in the rear region. 
     
     
         19 . Seat mechanism according to  claim 2 , wherein the seat has a flexible seat cushion carrier with a web in the central region. 
     
     
         20 . Seat mechanism according to  claim 3 , wherein the seat has a flexible seat cushion carrier with a web in the central region.