Patent ID: 8528870

Claim:
A retaining device for a stand having a drawable extending rod, the retaining device comprising: a base having a through hole for penetration of the extending rod; a shaft inserted in the base; a handle having a cam portion and an eccentric hole through the cam portion, and pivotally mounted on the shaft through the eccentric hole; a retainer moveably mounted in the base and having a receiving hole in which the cam portion of the handle is received such that the retainer is moveable by a pivotal movement of the cam portion of the handle to stop the extending rod in position; and an adjustment unit including the shaft having an eccentric shaft portion passing through the eccentric hole of the handle, and a teeth portion at an end of the eccentric shaft portion, a screw inserted in the shaft and provided with a distal end passing through a retaining hole of the base, a nut screwed to the distal end of the screw, and an elastic member sleeved on the screw and stopped against the base and the shaft; wherein when the screw is tightened, the teeth portion of the shaft is engaged with a teeth hole of the base for preventing the shaft from rotation, and when the screw is loosened, the teeth portion of the shaft is disengaged from the teeth hole of the base by an elastic force of the elastic member for allowing the shaft to be rotatable.