| 摘要 |
The present invention proposes a modified locking structure of a retractable draw bar. The proposed modified locking structure comprises a fixed assembly, a movable assembly, and a click button. The movable assembly has a longitudinally long guide hole to let a guide block and a pin bar of the fixed assembly penetrate through transversely. The movable assembly can thus be joined with the fixed assembly at the bottom opening of the first joint tube and can steadily move upwards or downwards with respect to the fixed assembly. The click button matched to a resilient element is allocated in a transverse allocation tank of the fixed assembly and protrudes in the long guide hole to be secured in a click hole of a second joint tube timely. A wedged guide groove and a wedged guide block both having an upper bevel and a lower bevel are installed at corresponding positions of the movable assembly and the click button, respectively. No matter a soft steel cord is used to pull the movable assembly upwards or a hard steel rod is used to press the movable assembly downwards, the click button can be pushed sideward and retracted transversely from the click hole. Smoother protraction/retraction and steadier positioning of the draw bar can thus be achieved. Moreover, easier assembly of the retractable draw bar can be achieved.
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