ZIPPER WITH STAMPED METAL ZIPPER TEETH
A zipper with stamped metal zipper teeth includes two zipper tapes each having a rib at one lateral side thereof, and metal zipper teeth mounted at the rib of each zipper tape. Each zipper tooth has two mounting legs located at the rear end thereof and clamped on the rib. The ratio between the width of each zipper tooth and the gap between the mounting legs of each zipper tooth and the ratio between the combined height of each zipper tooth and the associated engagement protrusion and the gap between the mounting legs of each zipper tooth are in respective predetermined ranges so that the zipper teeth are stronger or even smaller than conventional #2 zipper teeth and have a tight connection between the zipper teeth and the zipper tape.
(a) Field of the Invention
The present invention relates to zip fasteners and more particularly to a zipper with stamped metal zipper teeth. The zipper teeth are designed to have a high strength and can be made relatively small, preventing zipper teeth breaking and assuring a high level of connection tightness between the zipper teeth and the zipper tape.
(b) Description of the Prior Art
Conventional stamped metal zipper teeth for zippers are classified by size in #2, #3, #4, #5, #8, #10, wherein #2 is the smallest size. According to today's technology and zipper tooth structure, zipper teeth must be no smaller than the size #2 so that zipper teeth can be strong enough for tightly fastening to a zipper tape. If the zipper tooth are smaller than the size #2, the structural strength will be insufficient, and the zipper tooth can break and be easily forced away from the zipper tape. However, zippers with #2 zipper teeth cannot fully meet the needs of the industry. Some fashion designs require zippers with zipper teeth smaller than the size #2. Further, the use of smaller zipper teeth saves much metal material, and can achieve the purpose of environmental protection.
Referring to
However, the width A between the two planar walls 2022 of the retaining hole 202 of each zipper tooth 20 and the width C of the zipper teeth 20 have a ratio C:A>3; the height B of the zipper teeth 20 and the width A between the two planar walls 2022 have a ratio B:A>2; thus, it is difficult to make the zipper teeth 20 further smaller. If the width D of the roots 2011 of the mounting legs 201 is increased, the width E of the smoothly arched walls 2021 of the retaining hole 202 will be decreased. In this case, the mounting legs 201 can simply secure a rib 101 having a relatively smaller diameter. If the width A of the retaining hole 202 remains unchanged, the area of the mounting legs 201 for clamping on the rib 101 will be reduced, and the zipper teeth 20 can easily be forced away from the rib 101. On the contrary, if the width D of the roots 2011 of the mounting legs 201 is reduced to increase the width E of the smoothly arched wall 2021 of the retaining hole 202, the area of the mounting legs 201 for clamping on the rib 101 can be greatly increased, however, the strength of the roots 2011 of the mounting legs 201 will be relatively reduced, and the mounting legs 201 can break easily. More particularly, the smoothly arched wall 2021 defined by the retaining hole 202 of each zipper tooth 20 is adapted for securing the rib 101, however, each zipper tooth 20 has no other engagement means to keep the rib 101 in positive engagement with the smoothly arched wall 2021, and the zipper teeth 20 can fall from the rib 101 easily after a long use.
SUMMARY OF THE INVENTIONThe present invention has been accomplished under the circumstances in view. It is main object of the present invention to provide a zipper with stamped metal zipper teeth, which allows the zipper teeth to be made even smaller than conventional #2 metal zipper teeth, preventing zipper teeth breaking and assuring a high level of connection tightness between the zipper teeth and the zipper tape.
To achieve this and other objects of the present invention, a zipper comprises two zipper tapes each having a rib longitudinally extending along one lateral side thereof, and a plurality of zipper teeth fastened to the rib of each zipper tape. Each zipper tooth comprises an engagement protrusion located on one side of a front end thereof, a recess located on an opposite side of the front end for engaging into the recess of one respective zipper tooth at the other zipper tape, two mounting legs located at an opposing rear end thereof for clamping on two opposite lateral sides of the rib of one zipper tape and a retaining hole defined between the two mounting legs for accommodating the rib of one zipper tape. The gap between respective inner walls of respective rear ends of the two mounting legs of each zipper tooth is referenced by A. The combined height of each zipper tooth and the associated engagement protrusion is referenced by B. The width of the zipper teeth is referenced by C. The ratio between C and A is in the range of 2.5˜3. The ratio between B and A is in the range of 1.3˜1.8.
Thus, reasonably designing the structure of the zipper teeth enables the zipper teeth to have a high strength no matter they are made in any different specifications or even smaller than conventional #2 zipper teeth, and thus, the zipper teeth do not break easily, and can be tightly fastened to the zipper tapes and positively interlocked with the mating zipper teeth.
Further, each mounting leg of each zipper tooth comprises a root, and an engaging portion extending from the root for engaging the rib. The retaining hole of each zipper tooth defines a bottom wall, referenced by Z, and two first inner lateral wall respectively located on respective inner sides of the roots of the two mounting legs. The two first inner lateral walls each have a rear end thereof respectively connected to two opposite lateral sides of the bottom wall Z of the retaining hole. The two first inner lateral walls define a plane X between respective front ends thereof. The projected profile area of the bottom wall Z of the retaining hole, the two first inner lateral walls and the plane X is referenced by S1. The midpoint of the bottom wall Z of the retaining hole and two opposite ends of the plane X constitute three points that define an arc line Y. The projected profile area of the plane X and the arc line Y is referenced by S2. The area S1 is larger than the area S2.
The zipper with stamped metal zipper teeth of the invention has the advantages as follows:
(a) Based on the reasonable proportional design of A, B, C, the zipper teeth have a high structural strength no matter they are made in any specification or even smaller than conventional #2 zipper teeth, preventing zipper teeth breaking.
.(b) Through the design of the mounting legs and retaining hole, each zipper tooth can be tightly fastened the rib of each zipper tape, enabling the elastically deformed rib to fill up the whole area of the retaining hole Unlike the circular retaining hole design of the prior art zipper teeth, the retaining hole of each zipper tooth in accordance with the present invention forms a specially constructed structure of five connected planes, the cross-sectional shape of the rib can be highly changed after clamping of the two mounting legs of each zipper tooth on the rib, and therefore, the zipper teeth can be tightly fastened to the rib without vibration.
(c) After the two mounting legs of each zipper tooth are clamped on the rib, the rib is elastically deformed and has elastic potential energy, and therefore, the relatively thicker rib is prohibited from passing through the relatively narrower gap between the inner walls of the rear ends of the two mounting legs, preventing disconnection of the zipper teeth from the rib.
Referring to
As illustrated in FIG. Sand
As shown in
Based on the above-described structural design, the retaining hole 24 of each zipper tooth 2 forms a specially constructed structure of five connected planes. Unlike the structural design of the circular retaining hole of the prior art zipper tooth shown in
Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims
1. A zipper, comprising: two zipper tapes, each said zipper tape comprising a rib longitudinally extending along one lateral side thereof, and a plurality of zipper teeth fastened to said rib of each said zipper tape, each said zipper tooth comprising an engagement protrusion located on one side of a front end thereof, a recess located on an opposite side of the front end for engaging into the recess of one respective zipper tooth at the other said zipper tape, two mounting legs located at an opposing rear end thereof for clamping on two opposite lateral sides of said rib of one said zipper tape and a retaining hole defined between said two mounting legs for accommodating said rib of one said zipper tape, wherein, if the gap between respective inner walls of respective rear ends of said two mounting legs of each said zipper tooth is referenced by A; the combined height of each said zipper tooth and the associated said engagement protrusion is referenced by B; and the overall width of each said zipper tooth is referenced by C, then the ratio between C and A is in the range of 2.5˜3; and the ratio between B and A is in the range of 1.3˜1.8.
2. The zipper as claimed in claim 1, wherein the size of A is within 0.4 mm˜0.5 mm, the size of B is within 0.6 mm˜0.8 mm, and the size of C is within 1.1 mm˜1.4 mm.
3. The zipper as claimed in claim 2, wherein each said mounting leg comprises a root and an engaging portion extending from said root for engaging said rib; said retaining hole defines a bottom wall, referenced by Z, and two first inner lateral wall respectively located on respective inner sides of said roots of said two mounting legs, said two first inner lateral walls each having a rear end thereof respectively connected to two opposite lateral sides of said bottom wall Z of said retaining hole, said two first inner lateral walls defining a plane X between respective front ends thereof; the midpoint of said bottom wall Z of said retaining hole and two opposite ends of said plane X constitute three points that define an arc line Y; if the projected profile area of said bottom wall Z of said retaining hole, said two first inner lateral walls and said plane X is referenced by S1 and the projected profile area of said plane X and said arc line Y is referenced by S2, then the area S1 is larger than the area S2.
4. The zipper as claimed in claim 3, wherein said first inner lateral walls are planar walls.
5. The zipper as claimed in claim 3, wherein said first inner lateral walls are smoothly arched walls.
6. The zipper as claimed in claim 3, wherein each said first inner lateral wall has a rear end thereof connected to said bottom wall Z of said retaining hole through one of arched surface and sloping wall.
7. The zipper as claimed in claim 3, wherein said engagement portion of each said mounting leg defines a second inner lateral wall and a third inner lateral wall at an inner side thereof; said second inner lateral wall has a front end thereof connected to a rear end wall of the associated said mounting leg, and an opposing rear end thereof connected to sad third inner lateral wall; said third inner lateral wall has a front end thereof connected to said second inner lateral wall, and an opposing rear end thereof connected to the front end of said first inner lateral wall by an arched surface.
8. The zipper as claimed in claim 7, wherein the distance between said two second inner lateral walls is said gap A between the respective inner walls of the respective rear ends of said two mounting legs of each said zipper tooth; said second inner lateral walls of said engagement portions of said mounting legs are planar walls.
9. The zipper as claimed in claim 7, wherein said third inner lateral walls of said engagement portions of said mounting legs are sloping walls.
10. The zipper as claimed in claim 7, wherein said rear end walls of said mounting legs are respectively connected to two opposite outer lateral walls of the respective said zipper tooth by a respective sloping wall.
Type: Application
Filed: Mar 24, 2015
Publication Date: Jan 21, 2016
Inventor: Roger C. Y. Chung (New Taipei City)
Application Number: 14/667,664