Abstract: A control mechanism for a chair having two components which are pivotally movable relative to each other wherein one of the components is the chair seat. The other chair component, in one form of chair such as an office chair, is the seat back. In another form of chair, such as a swivel rocker, the other component is the chair base. The control mechanism includes a torsion bar which has a main body portion that extends front to rear of the seat member, and end portions, one of which is attached to the seat member and the other one of which is attached to the other chair component. During relative pivotal movement of the two pivotally connected chair components, the torsion bar acts as a spring to yieldably resist the pivotal movement and return the chair components to their original positions when the load is removed.

Abstract: A chair control for an office-type chair having a seat supporting frame upon which a bucket-type seat is supported. A seat back supporting structure is pivotally supported at its lower end on the frame and is provided at its upper end with a conventional back member. Intermediate its ends, the seat back supporting structure is adjustably connected to a torsion bar so that the torsion bar will yieldably resist backward tilting movement of the seat back member. The torsion bar is mounted on the seat frame and extends front to rear of the seat. This enables a low profile assembly of the chair control and location of the chair control within the outer shell which forms a part of the bucket seat.