| 摘要 |
A coupling structure of a telescopic rod includes an inner tube, an outer tuber, and a positioning device. The positioning device includes a rotatable lid, a resilient sleeve, a metallic ring, and a C-shaped sleeve. The C-shaped sleeve has a plurality of mini-ribs formed on an inner wall thereof. The mini-ribs are attached to the inner tube for providing a non-slip effect. The mini-ribs have less resistance with respect to the inner tube to provide a fine adjustment when the inner tube is extended or retracted with respect to the outer tube. An enlarged portion formed at a distal end of the inner tube is adapted to keep a proper gap between the inner tube and the outer tube for enhancing the steadiness of the telescopic rod. The rotatable lid is turned clockwise or counterclockwise for controlling the resilient sleeve, the metallic ring and the C-shaped sleeve to switch the inner tube in an adjustable state or in a fixed state.
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