| 摘要 |
A retractable pen includes an outer tube whose inner surface on a front end is arranged with a plurality of axial guiding rails circularly, an inner tube whose inner surface on a rear end is disposed with a plurality of stoppers is arranged circularly, a first sleeve mounted in the outer tube and having a plurality of ratchet teeth arranged circularly on a front end thereof as well as an axial guiding rail between two adjacent ratchet teeth sliding in the axial guiding rail of the outer tube, and an elastic member elastically supported between the front end of the inner tube and the axial guiding rail of the ring tube. In use, the rear end of the inner tube is pressed so as to change the length of the retractable pen.
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