| 摘要 |
A stepless positioning structure for a telescopic tube includes a spindle, a spring, an elastic sleeve, a ball socket, and a plurality of balls. The elastic sleeve has a first central through hole, an inner end fixed to an inner end of an inner tube, and an outer end provided with an engaging section. The engaging section has a reduced portion at an outer end thereof. The ball socket is disposed in an outer tube, and has a second central through hole and a plurality of chambers formed on a side wall thereof. The chambers interconnect with the second central through hole of the ball socket. Either of upper and lower ends of each chamber is formed with a curve surface. The balls are accommodated in the chambers of the ball socket. The spindle is inserted through the spring, the first central through hole of the elastic sleeve, and the second central through hole of the ball socket. The spring holds against an inner end of the spindle and the elastic sleeve, respectively. An outer end of the spindle is secured to an outer end of the ball socket. The present invention achieves a stepless adjustment and provides a confinement function to the inner and outer tubes. This is convenient for operation.
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