Double tooth spiral zipper

Abstract

The invention provides a dual-tooth-head spiral zipper. The dual-tooth-head spiral zipper comprises a pair of zipper tapes, wherein a plurality of zipper teeth are fixedly arranged on side edges, which are oppositely arranged, of the two zipper tapes. The dual-tooth-head spiral zipper is characterized in that each zipper tooth comprises a first branch tooth and a second branch tooth which are symmetrical in shape, the front parts of the two branch teeth respectively and obliquely extend towards the two sides of the height direction of the branch teeth, a clearance is arranged between the front parts of the two branch teeth, engaging grooves which extend along the height direction of the branch teeth are arranged on engaging parts of the branch teeth, and the two branch teeth of the same zipper tooth are respectively overlapped and engaged with adjacent branch teeth of the zipper teeth on the other zipper tape on the two sides of the zipper tooth; on the projection of the cross section of the zipper tapes, the lower part of the first branch tooth and the upper part of the second branch tooth are overlapped, and the two branch teeth are provided with clamping grooves at the overlapped part. The dual-tooth-head spiral zipper has the advantages that the zipper teeth are engaged stably and firmly, the anti-disengaging performance is high, the adjacent zipper teeth are not resisted and disengaged from each other even though the zipper is bent, and the appearance quality is excellent.

Description

technical field [0001] The invention relates to a slide fastener, in particular to a double tooth head spiral slide fastener with two tooth heads. Background technique [0002] The existing zipper mainly includes a pair of zipper tapes and chain elements arranged on the zipper tapes. Synthetic resin is injected to form plastic chain teeth on the zipper tapes. It has developed into a main production method of zipper chain teeth. Plastic chain teeth There are upper chain teeth straddling the outer surface of the zipper tape and lower chain teeth located on the inner surface of the zipper tape, the upper chain teeth are above the zipper tape, and the lower chain teeth are below the zipper tape. [0003] For the convenience of description, the tape length direction of the zipper tape is described as the width direction of the fastener element, the two ends in the width direction of the fastener element are called the outer side, and the central part in the width direction of the...

AI Technical Summary

Problems solved by technology

The chain teeth on the two zipper tapes are arranged alternately. After the zipper is closed, the tooth heads engage between the necks of the two chain teeth on the opposite zipper tape. The space between the two chain teeth necks on the same side of the zipper tape is opened by the other side The tooth heads of the chain teeth on the belt are filled, and the two rows of chain teeth are relatively staggered and occluded together. When the closed zipper is bent outward, the upper chain teeth staggered and occluded at the bending place are against each other, and the occlusal teeth are locked together. The upper chain teeth at the same time produce disengagement interference force, it is easy to disengage the chain teeth and burst the teeth, and its bite stability is poor

In the same way, when the zipper is bent inward, the lower chain teeth at the bend will be against each other, which will cause disengagement interference to the engaged lower chain teeth, and it will also easily cause the chain teeth to disengage.

Moreover, the height of the plate-shaped plastic fastener elements limits the length of the meshing groove between the tooth head and the neck, and the flat pull strength of the zipper is poor. easy to disengage

In addition, it is difficult to have a big change in the appearance of the zipper with this traditional way of engaging the teeth, and it does not have a novel and fashionable appearance quality

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