Patent ID: 8388254

Claim:
A shaft member comprising an inner tube, an outer tube, and an adjustable positioning device, wherein the inner tube includes a plane axially formed on a peripheral side thereof, wherein the plane includes a plurality of holes arranged thereon and spaced apart from each other equally, wherein the outer tube includes a cutout disposed on one end thereof to receive the inner tube, wherein the adjustable positioning device includes a fixing seat, a retaining block, a stop switch, and a resilient element, wherein a cross section of the fixing seat is formed in a U-shape pipe shape to face to an outer rim of the one end of the outer tube which includes the cutout, wherein the fixing seat includes two extending sides, wherein the retaining block is formed in an elongated Z shape and is axially defined between the two extending sides of the fixing seat, wherein the retaining block includes a pressing portion and a bore fixed on one end thereof, wherein the retaining block further includes a lock tab extending outward from another end thereof, wherein the stop switch is formed in a slidable cover shape to be covered to the fixing seat, wherein the stop switch includes a shoulder disposed on one end thereof to be inserted in the bore of the retaining block to stop the retaining block to be pressed and to operate, wherein the resilient element is defined between the retaining block and the stop switch to contact with the retaining block and the stop switch, wherein the lock tab of the retaining block is retained in one of the plurality of holes.