Patent ID: 8764110

Claim:
A resilient leaning position-restoring device for a height-adjustable chair back of an office chair, with the resilient leaning position-restoring device comprising a back support unit and a chair back slidably disposed at the back support unit and thus being height-adjustable, wherein the resilient leaning position-restoring device comprises a sliding element, a spring, and a resilient member, with the spring connected to a lower portion of the back support unit and to the sliding element, with the sliding element being pulled downward by the spring to slide along the back support unit, with the resilient member extended from the sliding element to form an inverted U-shape by the resilient member and the sliding element, with the resilient member forming the inverted U-shape having a first, free lower end opposite to a second, free lower end of the sliding element, with the first, free lower end coupled to a bottom of the chair back, with the first and second, free lower ends being biased to move away from each other by the resilient member.