Patent ID: 8632130
Filing Date: 2014-01-21
Classification: A47C

Abstract:
1. An adjustment device for extending a backrest of a chair, the adjustment device comprising: a seat support; a base support coupled to the seat support and comprising a base portion that is aligned with the seat support; a rotating user-controlled first handle adapted to control selection of an angular position of the adjustment device, wherein the rotation of the first handle generates traction of a first tensional element that moves with respect to a first elastically deformable element; a stroke limiter that runs transversely to the base support, wherein the stroke limiter is provided with a stepped configuration that selectively interacts with a limit switch linked to the seat support; a torsion bar that elastically limits the movement of said base support; and a second handle, aligned with said first handle, that engages a lifting column through a second tensional element.