Abstract: A retractable support arm structure, which is applied between a base and a steering mechanism of a LCD stand includes an upright arm having a hollow part, an telescopic arm having one end inserted into the hollow part, and a spring member located between the upright arm and the telescopic arm to store a upwardly extending potential energy and several friction members therebetween are used to maintain the balance. The upright arm and the telescopic arm are constituted by square tube made by seamless corner bar.

Abstract: A retractable support arm structure, which includes an upright tube fastened to a base, an telescopic arm, which has a bottom end downwardly inserted into the upright tube and a top end connected to a steering mechanism holding a load such as LCD monitor (or LCD TV), a first friction member capped on the top end of the upright tube and disposed to contact with the periphery of the telescopic arm, a second friction member capped on the bottom end of the telescopic arm and disposed in contact with the inside wall of the upright tube, and a spring member, which is mounted inside the upright tube, having a top fastened to the upright tube and a bottom end coiled up to form a helical spring portion that is to stop against the second friction member.