Patent ID: 7726740
Filing Date: 2010-06-01
Classification: A47C

Abstract:
1. A backrest tilting device in a reclining chair comprising a seat, a leg and a backrest, said backrest tilting device comprising: a support supported by the leg and supporting the seat of the chair; a pivot pivotally mounted to the support and comprising an arm extending perpendicular to said pivot; a pair of backrest support rods having a front end fixed to the pivot and a rear end coupled to the backrest; a rotation-promoting unit comprising a rubber torsion spring comprising the pivot as a core, an outer tube fixed to the support and elastic material positioned between the outer tube and the pivot, said pivot turning with respect to the outer tube to allow the elastic material to be elastically deformed to apply return-turning force to the pivot; and a gas spring having a front end, a rear end and a knob at the front end, the front end being coupled to the support, the rear end being coupled to an end of the arm of the pivot, the knob being configured to be moved to an active position to enable the gas spring to extend and to contract and the knob being configured to be returned to a passive position that prevents the gas spring from extending, and wherein the arm extends from the middle of the pivot, and the rotation-promoting unit is positioned at each side of the arm.