Patent ID: 8043020
Filing Date: 2011-10-25
Classification: F16B,Y10T

Abstract:
1. A coupling structure of a telescopic rod, comprising: an inner tube; an outer tube slidingly received within the outer tube, the outer tube having an outer threaded section at an upper end thereof, wherein the inner tube having an upper end coupled with a joint member and a lower end formed with an enlarged portion, the enlarged portion having an outer diameter which is slightly less than an inner diameter of the outer tube; and a positioning device configured to change the telescopic rod between a fixed state and an adjustable state, the positioning device comprising: wherein the lip when located between the upper end of the outer tube and the underside of the metallic ring and attached to the inner tube is configured to provide a non-slip effect to prevent accidental disengagement of the inner tube, wherein the mini-ribs when uncompressed having a low sliding resistance with respect to the inner tube selected to provide a fine adjustment when the inner tube is extended or retracted with respect to the outer tube, the enlarged portion of the inner tube being adapted to keep the gap between the inner tube and the outer tube, the rotatable lid being turned clockwise or counterclockwise for moving the resilient sleeve, the metallic ring and the C-shaped sleeve upward or downward to switch the inner tube between the adjustable state and the fixed state, wherein the coupling structure is configured so that when the rotatable lid is turned clockwise to move downwardly for fixing the inner tube, the metallic ring is urged by the outer tube to compress the bottom of the resilient sleeve to move upwardly and the oblique portion is confined by the reduced opening to tighten the inner tube such that the inner tube is fixed and the mini-ribs on the inner wall of the C-shaped sleeve are selectively attached to the inner tube to provide the non-slip effect, thereby preventing the inner tube from accidental disengagement while the C-shaped sleeve is compressed.