Flat bottom resin zipper

The invention discloses a flat bottom resin zipper, which injects resin chain teeth onto a core wire or a chain cloth. Each resin chain tooth has a sewing thread slot on the top and a chain cloth embedding groove on the bottom. Then sew the entire resin chain teeth to the chain cloth, so that the sewing threads are tightened in the sewing thread slots, and the chain cloth is embedded in the chain cloth embedding grooves, forming a double fixed structure of injection molding and sewing thread sewing. Afterwards, the inner side of the chain cloth is folded back to form a flat bottom zipper with only the chain cloth on one side of the zipper without any protruding resin chain tooth, which can be used as an anti-pinch zipper or an invisible zipper.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to a zipper, especially a flat-bottomed resin zipper in which resin teeth are injection-molded and sewn on one side of a chain cloth, and the other side of the chain cloth has no protruding teeth.

(b) Description of the Prior Art

The known resin zipper is to injection mold the resin teeth on the inner side of the chain cloth to form a structure in which the rear end of each resin tooth is clamped on both sides of the chain cloth, so the appearance of the entire row of resin chain teeth can be seen on both sides of the chain cloth. Because there are protruding chain teeth on the front and back of the chain cloth, when the zipper is applied to the clothing, it may affect the overall appearance, and the zipper slider is easy to be caught in the inner lining of the clothing when it slides.

Conventional resin chain teeth must be directly injection molded on the chain cloth. If the resin chain teeth are separately injection-molded first, there will be a problem that the resin chain teeth are difficult to combine with the chain cloth. Because most of the resin chain teeth that are separately injection molded according to the existing technology are small in structure and size, it is difficult to neatly arrange a large number of scattered resin chain teeth on the chain cloth one by one, and at the same time use the sewing threads of the sewing machine device for sewing and fixing.

Furthermore, the known chain teeth and chain cloth are sewn together with sewing threads, because both the sewing threads and the chain cloth have some elasticity and slack, and it is difficult to overcome the lateral tension of the chain cloth when the chain teeth and chain cloth are sewn together with sewing threads. Lateral pull. When sutures are used to sew the sprocket to the chain cloth, it is also difficult to overcome. For this reason, how to solve the technical problem that the resin chain teeth can be separately injection molded and then be fixed on the chain cloth with sewing threads, and how to improve the effect of resisting lateral tension is the problem to be actively overcome by the present invention.

SUMMARY OF THE INVENTION

The main object of the present invention is to provide a flat bottom resin zipper, which pre-injects resin chain teeth on a core wire, where each resin chain tooth has a sewing thread slot on the top and a chain cloth embedding groove on the bottom, then the resin chain teeth are arranged on the chain cloth for sewing thread sewing, so that the sewing threads on one side are embedded and tightened in the sewing thread slots of the resin chain teeth, and the chain cloth on the other side is embedded in the chain cloth embedding grooves, and afterwards, the chain cloth is reflexed to become a flat-bottomed zipper structure, so that the resin chain teeth can be injection molded separately and then sewn on the chain cloth, which can strengthen the combination and stability of the resin chain teeth and chain cloth.

The second object of the present invention is to provide a flat bottom resin zipper, through the pre-injection molding of the plurality of resin chain teeth on the chain cloth, each resin chain tooth has a sewing thread slot on the top and a chain cloth embedding groove on the bottom, so that the sewing threads can be tightly bound in the sewing thread slots and chain cloth embedding grooves, and then the chain cloth is folded back to form a flat-bottomed zipper structure to achieve the function of strengthening the combination stability of resin chain teeth and chain cloth.

Still another object of the present invention is to provide a flat bottom resin zipper, which achieves the function of stably embedding sewing threads and chain cloth into sewing thread slots and chain cloth embedding grooves through the special sewing method and structure of multiple sewing threads.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

First Embodiment

As shown inFIG.1andFIG.2, a flat bottom resin zipper of the present invention, its first preferred embodiment comprises two zipper tapes100and a zipper slider200. Each zipper tape100is composed of a chain cloth10, a chain tooth bar20and a plurality of sewing threads30.

As shown inFIG.2, the chain tooth bar20comprises a core wire21, the core wire21is made of nylon or natural fiber, and the core wire21is pre-arranged with a plurality of injection-molded resin chain teeth22. As shown inFIG.3toFIG.6, each of the resin chain teeth22adopts plastic or synthetic resin injection molding to comprise a rectangular block221, a through hole222connecting the two sides of the rectangular block221, a chain tooth head223formed at one end of the rectangular block221, and a sewing thread slot224recessed downward from the top of the rectangular block221. The sewing thread slot224is a semicircular groove, and its two ends extend to both sides of the rectangular block221. When the resin chain teeth22are injection molded, a core wire21is first passed through the mold, and then each resin chain tooth22is injection molded on the core wire21to form a structure in which the core wire21is penetrated and fixed on the through hole222, so that the resin chain teeth22are arranged on the core wire21at intervals.

As shown inFIG.3andFIG.4, one end of the above-mentioned rectangular block221is integrally formed with a support block225, the support block225is a triangular block whose tip faces the chain tooth head223, so that the support block225is integrally connected to the lower side of the chain tooth head223. The two sides of the chain tooth head223respectively form an engaging protrusion2231and an engaging recess2232, so that the engaging protrusions2231on both sides of the chain tooth head223protrude from the two sides of the support block225, and the width between the engaging recesses2232is smaller than the support block225, therefore, the support block225forms a support surface2251at the bottom end of the engaging recesses2232. In this way, when the resin chain teeth22are engaged, the engaging protrusion2231can abut against the support surface2251of another chain tooth and engage with the engaging recess2232.

The above-mentioned chain tooth bar20of the present invention is connected in series through the core wire21, so that most resin chain teeth22do not need to be directly injection-molded on the chain cloth10. Therefore, it is allowed to make the chain tooth bar20first during production, and then select the corresponding chain tooth bar20according to the color or size specification of the chain cloth10and sew it on the chain cloth10. As shown inFIG.2andFIG.6toFIG.8, when sewing, the chain tooth bar20is arranged parallel to the second surface of the chain cloth10, so that the underside of the rectangular blocks221fit on the second surface of the chain cloth10, and the chain tooth heads223protrude from inner side of the chain cloth10. Then use some sewing threads30to sew, make the sewing threads30wind around in the sewing thread slots224of the resin chain teeth22, and make the sewing threads30sew on the chain cloth10between each of the resin chain teeth22, so that each resin chain tooth22is stitched and fixed on the second surface of the chain cloth10.

As shown inFIG.2andFIG.6, after the stitching is completed according to the above structure, the inner side of the chain cloth10together with the chain tooth bar20is folded back to the outer side of the chain cloth10, so that the chain cloth10forms a chain tooth belt11and a sliding space12between the chain tooth belt11and the chain cloth10. Therefore, the above-mentioned chain tooth bar20is located on the chain tooth belt11opposite to the sliding space12. At this time, the two first sewing threads31are located on the first surface of the chain tooth belt11. With this structure of reversing the chain cloth10, one side of the zipper is only the chain cloth10and there is no protruding chain tooth surface with a flat bottom zipper structure. The side without chain teeth can be used as the back (inner side) of the anti-pinch zipper, so that the chain teeth and zipper slider are located on the front (outer side) of the zipper, preventing the resin chain teeth22from being caught in the inner lining of the clothing. The side without chain teeth can also be used as the front (outer side) of the invisible zipper, hiding the chain teeth and zipper slider on the back (inner side) of the zipper, so that there are no protruding resin chain teeth22and zipper slider on the outer side of the clothing.

As shown inFIG.2andFIG.6toFIG.8, the several sewing threads30of the present invention preferably have two first sewing threads31and one second sewing thread32. The two first sewing threads31are located on the first surface of the chain cloth10, and the two first sewing threads31are continuously passed through the gaps between the resin chain teeth22to the second surface of the chain cloth10through a sewing machine and then are folded back to the first surface of the chain cloth10, so that the two first sewing threads31form two loops311at each gap on the second surface of the chain cloth10, and the two first sewing threads31are fastened to the first surface of the chain cloth10. The second sewing thread32repeatedly passes through the two loops311of the first sewing threads31on both sides of each resin chain tooth22on the second surface of the chain cloth10. The second sewing thread32is continuously operated by the sewing machine to form a three-segment thread body321in which the second sewing thread32is fastened in the sewing thread slots224. In this way, the three-segment thread body321is embedded in the sewing thread slot224, which can prevent the resin chain tooth22from sliding off, and at the same time prevent the zipper slider200from rubbing against the second sewing thread32.

As shown inFIG.9toFIG.11, it is another embodiment of the resin chain tooth22of the present invention, which differs from the above-mentioned first embodiment in that: The height of the chain tooth head223of the resin chain tooth22is the same as that of the rectangular block221, so there is no above-mentioned triangular support block225below the chain tooth head223, so that the chain tooth head223at one end of the entire resin chain tooth22can be used for the two zipper tapes100to bite each other. As for the structure and method of sewing it on the chain cloth10(as shown inFIG.11), it is the same as above-mentionedFIG.6toFIG.8. It can be known that the present invention can implement different chain tooth heads223to achieve the purpose of flat bottom resin zipper.

As shown inFIG.4,FIG.6,FIG.10andFIG.11, the rectangular block221of the resin chain tooth22of the present invention can be provided with a chain cloth embedding groove227that is recessed from the bottom to the top. The chain cloth embedding groove227is a groove with a rectangular or semicircular section, and is connected to both sides of the rectangular block221. Through the structural design of the chain cloth embedding groove227, when the above-mentioned first sewing thread31is fastened to the first surface of the chain cloth10, not only the first sewing thread31will fall into the softer chain cloth10, but also the chain cloth10can be embedded in the chain cloth embedding groove227after being pressed by the first sewing thread31(as shown inFIG.6orFIG.11). In this way, a structure in which the chain cloth10is fitted with the chain cloth embedding groove227is formed, so that the zipper can effectively resist the transverse pulling force of the chain cloth10.

Second Embodiment

As shown inFIG.1, it is two embodiments of the present invention. The zipper tape100also comprises a chain cloth10′, a chain tooth bar20′ and several sewing threads30′. As shown inFIG.12andFIG.13again, its difference with the above-mentioned first embodiment is: The chain tooth bar20′ does not implement the above-mentioned core wire21, and directly injects and molds most resin chain teeth22′ on the inner side of the chain cloth10′; each resin chain tooth22′ comprises an integrally formed a rectangular block221′, a cloth groove226′ laterally recessed from one end of the rectangular block221′ towards the other end to replace the above-mentioned through hole222, a chain tooth head223′ formed at one end of the rectangular block221′ for engagement, a sewing thread slot224′ recessed from the top of the rectangular block221′ to its bottom, and at least one chain cloth embedding groove227′ recessed from the bottom of the rectangular block221′ toward its top. The sewing thread slot224′ and the chain cloth embedding groove227′ also extend to both sides of the rectangular block221′ respectively. The cloth groove226′ is extended from the end of the chain tooth head223′ to the rectangular block221′, for when the resin chain tooth22′ is injection molded on the inner side of the chain cloth10′, the chain cloth10′ is clamped on the cloth groove226′.

As shown inFIG.13, when the resin chain tooth22′ is injection molded, the inner side of the chain cloth10′ will be clamped in the cloth groove226′, and the chain tooth head223′ will temporarily face the outer side of the chain cloth10′ in this state. Then, as shown inFIG.14, use several sewing threads30′ to sew in the sewing thread slot224′ and chain cloth embedding groove227′ of each resin chain tooth22′, so that the sewing threads30′ are sewed to the chain cloth10′ in the gap between resin chain teeth22′, and the sewing threads30′ are embedded and tightened in the sewing thread slots224′ and the chain cloth embedding grooves227′. The chain cloth embedding groove227′, in addition to having the function of providing the fitting of the chain cloth10in the above-mentioned first embodiment, can also be used as a positioning groove for fitting of two first sewing threads31in this embodiment, to strengthen the stability of the combination of the resin chain teeth22′ and the chain cloth10′, and prevent the sewing threads30′ from being moved or worn due to lateral tension.

As shown inFIG.14andFIG.15, after the resin chain teeth22′ are injection molded on the chain cloth10′, the inner side of the chain cloth10′ can be turned back to the outer side of the chain cloth10′ to form a chain tooth belt11′ and a sliding space12′ between the chain tooth belt11′ and the chain cloth10′, so that the chain tooth heads223′ of the resin chain teeth22′ protrude from the reversing edge of the chain cloth10′. In this way, a flat bottom zipper with only the chain cloth10′ on one side of the zipper without any protruding resin chain tooth22is formed. The zipper made in this embodiment can also use the side without chain teeth (only chain cloth10′) as the back (inner side) of the anti-pinch zipper, and the side with resin chain teeth22′ can be used as the front (outer side) of the zipper, to achieve the anti-pinch function that the resin chain teeth22′ will not touch the inner lining of the clothing. In this implementation, the side without chain teeth can also be used as the front (outer side) of the invisible zipper, and the side with resin chain teeth22′ can be used as the back (inner side) of the zipper, so that the resin chain teeth22′ are hidden behind the zipper, and there is no protruding resin chain teeth22outside the clothing.

As shown inFIG.14andFIG.15, the sewing threads30′ of this embodiment also include two first sewing threads31′ and one second sewing thread32′. The two first sewing threads31′ are wound around the chain cloth embedding grooves227′ of the resin chain teeth22′ to prevent the second sewing thread32′ from being moved or worn by lateral tension, and the two first sewing threads31′ are continuously passed through the gaps between the resin chain teeth22′ to the second surface of the chain tooth belt11′ and then are folded back to the first surface of the chain tooth belt11′ (seeFIG.2), so that two loops311′ are formed at the gap on the second surface of the chain tooth belt11′. The second sewing thread32′ repeatedly passes through the loops311′ on both sides of each resin chain tooth22′, so that the second sewing thread32′ forms a multi-segment thread body321′ embedded and tightened in the sewing thread slots224′. It achieves the effects of tightening the resin chain teeth22′ and preventing the first sewing threads31′ and the second sewing thread32′ from moving or being worn, and the zipper can effectively resist the transverse pulling force of the chain cloth10.