Waterproof dual-track zipper

Abstract

A waterproof dual-track zipper includes two zipper tapes of the same structure, each zipper tape including a tape body, a mating strip integrally formed with one lateral side of the tape body and a sealing structure located on one side of the mating strip, the sealing structure including a male engaging member and a female engaging member, a first close-ft portion connected between the male and female engaging members and a second close-fit portion at an opposite lateral side of the male engaging member, and a zipper slider coupled between the two zipper tapes and movable to force the male engaging member of one zipper tape into engagement with the female engaging member of the other zipper tape and to abut the first and second close-fit portions of one zipper tape be against hook flanges of the female engaging member of the other zipper tape, achieving excellent waterproofing effects.

Description

BACKGROUND OF THE INVENTION[0001](a) Field of the Invention[0002]The present invention relates to zip fasteners and more particularly to a waterproof dual-track zipper, which effectively prevents water permeation.[0003](b) Description of the Prior Art[0004]Regular zippers commonly comprise two zipper tapes each carrying a series of interlocking teeth, and zipper slide coupled to the two series of interlocking teeth and movable in two reverse directions, to interlock the two series of interlocking teeth in one direction and to separate the two series of interlocking teeth in the other direction. However, due to gaps existing in the two interlocked series of interlocking teeth, these zippers are not waterproof. There are commercial waterproof zipper designs, however these waterproof zipper designs still use interlocking teeth for sealing and other waterproof techniques to prevent water penetration. Some other waterproof zipper designs use a re-sealable structure instead of interlockin...

AI Technical Summary

Benefits of technology

[0008]Further, a waterproof pocket is affixed to one end of the first zipper tape and one corresponding end of the second zipper tape. The pocket defines an opening in one side thereof facing toward the zipper slider for enabling the zipper slider to pass therethrough into the inside of the waterproof pocket when the zipper slide is moved to close the first zipper tape and the second zipper tape.

[0009]Due to the characteristic that the first and second zipper tapes have the same structure, one same mold can be used to make the first and second zipper tapes, thereby saving the manufacturing cost. More particularly, the design of the female engaging members, male engaging m

Problems solved by technology

However, due to gaps existing in the two interlocked series of interlocking teeth, these zippers are not waterproof.

Making these two different shapes of seal members requires two different molds and therefore high production costs.

Further, the close-fitting tightness and sealing stability of the sealing str

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