Zipper Slide for Double-Layer Nylon Zipper

Abstract

A zipper slide so configured that the retracted design of the rear side of the bottom slide body block relative to the top slide body block provides sufficient space for allowing the inner layer of the double-layer nylon zipper to be smoothly curved when the zipper slide is cornering, reducing zipper friction resistance and prolonging the zipper lifespan; the upper guard flanges are relatively longer than the lower guard flanges so that the upper guard flanges are kept relatively closer to the center block than the lower guard flanges to shift the fulcrum forward, enabling each of integrated opposing left and right series of interlocking teeth of the double-layer nylon zipper to face toward the fulcrum and the center block when each of integrated opposing left and right series of interlocking teeth of the double-layer nylon zipper is opened to the extent.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to zipper technology and more particularly, to a zipper slide for double-layer nylon zipper, which greatly improves sliding mobility, reducing zipper sewing seam and teeth wear and prolonging zipper slide lifespan.[0003]2. Description of the Related Art[0004]The basic functional design of a zipper slide derives from rotating engagement between gears. The left series of teeth and right series of teeth of a zip fastener are regarded as two equal length flexible tooth bar. A zipper slide is movable by a pull tab to interlock or separate left and right series of teeth. In order to enhance protection and to prevent the occurrence of zipper split, double layer zippers are created. U.S. Pat. No. D651,129, issued to the present inventor, discloses a double layer coil zipper slider for use in a double layer zipper. A zipper slider for double layer zipper increases the distance between the opposing t...

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