| 摘要 |
Adjustable locking and unlocking structure for a telescopic tube, including two locating members mated with each other, an actuating push plate, a restoring spring, a main restricting plate, a subsidiary restricting plate, several restricting rings, a compression spring and an adjustment rod. The inner face of each of the locating members is formed with a central arch channel for the adjustment rod to pass therethrough. A middle rear section of the arch channel is cut with a trapezoid restricting cavity. A front and a rear walls of the tapered restricting cavity are formed with slope sides. Each of the main and subsidiary restricting plates includes a circular restricting ring section and a bent press section integrally connected with upper side of the restricting ring section. The restricting ring section is formed with a central restricting hole. Each of the restricting rings is formed with a central frictional stop hole slightly smaller than the restricting holes of the main and subsidiary restricting plates. The outer diameter of the adjustment rod is slightly smaller than the diameter of the stop hole of the restricting ring. By means of the structure, the daughter tube of the telescopic tube is more firmly located in the mother tube and can be stagelessly adjusted in length and the appearance of the telescopic tube will be ruined.
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