| 摘要 |
A positioning structure for a retractable tube assembly having a retractable tube set, which has two semicircle recesses formed in a bottom wall thereof, and a rotary knob, which has a receiving hole formed in a top wall thereof, for locking the rotary knob to the retractable tube includes a positioning member that is movably mounted in the receiving hole of the rotary knob and has a bottom hole, and a spring member disposed between the bottom hole of the positioning member and the receiving hole of the rotary knob for pushing the positioning member into one semicircle recess to further lock the rotary knob to the retractable tube set. |
