MECHANISM FOR THE TILTABLE SEAT OF A CHAIR

摘要

A pivot mechanism for a chair seat in which a torsion bar is fastened at its ends within a tube and to the underside of a seat. A support member fastens the tube for relative rotation about its own axis to a seat base. The tube has a transverse opening therein through which an arm rigidly attached to said torsion bar extends. The arm is positionable with respect to an abutment on the support member by means of a manually operable torque varying mechanism.