Slide fastener

Abstract

Provided is a slide fastener whereby waterproof properties near a bottom stop can be enhanced in cost-effective manner. A slide fastener (1) having a waterproof structure comprises a left-right pair of fastener stringers (2) each having a plurality of fastener elements (3) arranged in a row along an opposing edge (11) of each of a left-right pair of waterproof fastener tapes (10), a slider (7) for engaging and disengaging the left and right fastener elements (3) with each other, and a bottom stop (4) formed at the bottom end of the rows of fastener elements (3) so as to straddle the left and right fastener tapes (10). Each fastener element (3) includes an engaging head part (30), a base part (33), a neck part (32), and a shoulder part (34), and the bottom stop (4) covers a first fastener element (3a) near the lowermost end except for an upper portion of an engaging head part (30a) of the first fastener element, and covers a lower portion of a base part (33b) of a second fastener element (3b) that is above and adjacent to the first fastener element (3a). In the bottom stop (4), a recess (40) is provided that is downwardly indented at the top of the bottom stop. The upper portion of the engaging head part (30a) of the first fastener element (3a), and the lower portions of the neck part (32b) and the engaging head part (30b) of the second fastener element (3b) are disposed in the recess (40). A linking part (41) between the first and second fastener elements (3a, 3b) may be provided in the recess (40).

Description

technical field [0001] The present invention relates to slide fasteners, especially to slide fasteners with water resistance. Background technique [0002] There is known a waterproof zipper constructed in the following manner: a pair of left and right zipper strings are formed by injection molding a synthetic resin material into a plurality of zipper elements at opposite edge portions of a left and right pair of waterproof zipper tapes for The slider that engages and disengages the left and right zipper elements is inserted between the left and right zipper strings in a slidable manner, and is attached to the lower end of the zipper elements by injection molding of a synthetic resin material. Stop code, install top stop code on the upper end. In Japanese Patent Application Publication No. 02-107309, etc., it is disclosed that there is a technique of injecting and molding a synthetic resin material to go out the bottom stop code. With regard to such a zipper, each zipper e...

AI Technical Summary

Problems solved by technology

[0008] However, in the slide fastener described in Patent Document 2, the sheet-like member may peel off due to long-term use.

On the other hand, in the method of covering the fastener element at the lower end with the bottom stopper, there are cases where molten resin is engaged from the front and back of the mold and the engaging head of the fastener element due to the pressure during injection molding. The gap between the heads leaks upward to form a burr, which makes it difficult to manufacture the zipper, and the leaked resin prevents the engagement and disengagement of the zipper elements near the lower end.

In addition, in order to completely prevent liquid leakage from the mold during the injection molding of the bottom stop, it is necessary to make the mold with high precision. In this case, the production cost of the slide fastener becomes too high

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