Patent ID: 7802847
Filing Date: 2010-09-28
Classification: A47C

Abstract:
1. An angle-adjusting structure for a backrest of a chair, the angle-adjusting structure being mounted at a rear side of a butterfly-shaped mounting member of the chair and comprising: a main body formed with an internal hole; a rotating member having a connecting section formed with an internal hole provided with internal teeth; a shaft having external teeth and passing through the internal holes of the main body and of the connecting section of the rotating member; a resilient element mounted around an end of the shaft; a cover secured to the main body by a threaded fastener; and a pressing member mounted on an opposite end of the shaft adjacent to an outer wall of the main body; wherein by pressing the pressing member inward, the external teeth of the shaft are disengaged from the internal teeth of the rotating member, allowing the rotating member to rotate freely, and when the pressing member is released, the resilient element mounted around the end of the shaft extends outward to re-engage the external teeth of the shaft with the internal teeth of the rotating member, thereby securing the rotating member in place; and wherein the connecting section of the rotating member has an upper part and a lower part which are formed with restricting portions, respectively, to prevent the rotating member from being rotated to an excessively small or excessively large angle.