Zipper is one of the most practical inventions of last century, and is extensively used in a wide range of trades and industries. Traditional sliders of zippers may be categorized into automatic locking and non-automatic locking type. An automatic locking slider usually includes a slider body, a pull tab, a locking lever, a plate spring, and a cover. The cover may be fixed to an upper wing of the slider, and attach the pull tab to the slider. The plate spring and the locking lever may be disposed within the cover. The locking lever may receive pressing force generated by the plate spring. Under the force, a locking prong of the locking lever may pass a locking opening on the upper wing to be disposed in the space between two zipper teeth to lock the slider in a position. The pull tab may lift the locking leer when it is pulled. The locking prong may be subsequently removed from between zipper teeth to release the locking of the slider to allow the movement of the slider on zipper. Traditionally, the locking lever, the plate spring and the cover are manufactured by press riveting. The slider body and the cover containing the plate spring and locking lever are also manufactured by press riveting. The manufacturing of a slider is complex and the efficiency is low due to the press riveting and the riveting force is not enough high. In addition, a cover riveting apparatus is required for the press riveting, which increases the production costs of a zipper slider. Even more, there exists the risk that the riveted cover falls off due to inadequate riveting. Tests have shown that the composite pulling force of the slider body and the pull tab of the zipper slider is not stable.
The disclosed slider is directed at solving one or more problems set forth above and other problems.