Patent ID: 6568757
Filing Date: 2003-05-27
Classification: A47C,Y10T

Abstract:
An office chair comprising:a frame having a tube with a tapered inner periphery and two holes defined through said tube, a plurality of legs extending from said tube; a C-shaped sleeve having a tapered outer periphery which is complementary to said tapered inner periphery of said tube, said C-shaped sleeve being received in said tube, said tapered outer periphery of said C-shaped sleeve being engaged with said tapered inner periphery of said tube, two notches defined in said tapered outer periphery of said sleeve, two pins extending through said two holes in said tube and engaged with said two notches, said sleeve having a threaded inner periphery and a slit defined longitudinally thought said sleeve, and a seat post extending through said sleeve and having a threaded section which is engaged with said threaded inner periphery such that when said seat post is pushed toward said tube, said C-shaped sleeve sinks in said tapered inner periphery axially of said tube with said slit being narrowed, and said C-shaped sleeve moves with said seat post with said slit being widened when said seat post is lifted in a direction away from said tube.