Patent ID: 6866053

Claim:
A telescopic shank of a beach umbrella having a canopy supported by frame, the shank comprising: an upper support tube coupled to the frame for supporting the canopy in an opened position; and a lower sliding tube having an outer diameter slightly smaller than an inner diameter of the support tube so as to be slidingly received in the support tube, the sliding tube including a top fastening mechanism having a diameter slightly smaller than the inner diameter of the support tube, the fastening mechanism including an intermediate shaft being eccentric with respect to the sliding tube, an eccentric groove around the shaft, and a stop projected on the eccentric groove, and an eccentric C-shaped locking means put on the eccentric groove, the C-shaped locking means including a stop block, wherein responsive to a first rotating the sliding tube with respect to the support tube, the stop of the fastening mechanism and the stop block of the C-shaped locking means are opposite in a sliding position, and responsive to a second rotating the sliding tube, the fastening mechanism, and the shaft about half circle with respect to the support tube, the stop of the fastening mechanism is urged against the stop block of the C-shaped locking means so as to have an eccentric portion of the shaft and the stop of the fastening mechanism to urge against the C-shaped locking means for biasing one side of the C-shaped locking means against an inner wall of the support tube in a locked position.