Abstract: A supporting framework for a swivel chair or table includes a gas spring and a cylinder put on the gas spring. The cylinder includes two opposite holes and a plurality of equally circumferentially spaced longitudinal apertures. Spring loaded posts and lock bars are located in the apertures. A fastening ring rests upon the cylinder and includes a plurality of equally circumferentially spaced openings having a diameter less than a diameter of the posts but slightly larger than a diameter of the lock bars. A hollow cap with the gas spring projected therethrough includes two opposite channels of an inverted L-shape. Two, lock pins are inserted through the channels and the holes for fastening the cap and the cylinder together. Moving the lock pins from upper second positions to lower first positions in the channels will enable the gas spring to rotate or vice versa will lock the same.

Abstract: Provided is a supporting framework for a swivel chair or table. The framework comprises a gas spring; a cylinder put on the gas spring and comprising two opposite holes and a plurality of equally circumferentially spaced longitudinal apertures; springs loaded posts and lock bars in the apertures; a fastening ring rested upon the cylinder and comprising a plurality of equally circumferentially spaced openings having a diameter less than a diameter of the post but slightly larger than a diameter of the lock bar; and a hollow cap with the gas spring projected therethrough, the cap comprising two opposite channels of inverted-L shape, and two lock pins inserted through the channels and the holes for fastening the cap and the cylinder together. Moving the lock pins either from upper second positions to lower first positions in the channels will enable the gas spring to rotate or vice versa will lock same.