Invisible zipper assembly

Abstract

The present disclosure relates to a concealed zipper assembly, which includes a zipper, a first sewn member, and a second sewn member, the zipper including first and second zipper teeth and first and second zipper tooth carriers, the first and second zipper teeth being respectively provided on the first and second zipper tooth carriers, wherein an end portion of the second sewn member is bent at least twice in the same clock direction, a first bent portion of the second sewn member having a multi-layer structure is formed by a penultimate bending, and a second bent portion of the second sewn member is formed by a final bending on the multi-layer structure formed by the penultimate bending, the second zipper tooth carrier is at least partially sewn inside the second bent portion of the second sewn member, the first zipper tooth carrier is sewn on the first sewn member, the first bent portion of the second sewn member is configured to abut on the first sewn member so that the first zipper teeth can be engaged with the second zipper teeth, and the zipper as a whole is shielded from the outside by the first sewn member and the second sewn member.

Description

Technical Field

[0001] This disclosure relates to the field of zippers, and more specifically to an invisible zipper assembly. Background Technology

[0002] Invisible zippers are a type of nylon zipper. The basic structure of a nylon zipper involves sewing the zipper teeth onto the zipper tape. When the zipper is reversed, the zipper teeth are located on the inside (the inside of the fabric being sewn on), and only the tape is visible. Reverse-mounted nylon zippers are also known as early invisible zippers. With increased demands for invisibility, the modern invisible zipper was developed. In invisible zippers, the zipper tape is bent, and the bent surfaces abut against each other, making the zipper teeth invisible from the outside, thus achieving a better concealment effect. Therefore, invisible zippers are widely used in the clothing industry, especially in women's evening gowns and various sofa or cushion covers.

[0003] CN102481040B discloses an invisible zipper for car seat cushions. Since car seat covers require zippers during installation, and the concealment effect of the zipper is crucial, the tension on the zipper in its width direction is relatively high, and ordinary invisible zipper tape can still be pulled open. Therefore, a rigid sheet is added to the inside of the tape to increase its rigidity and allow the bent parts to better abut against each other. However, placing a rigid sheet inside the tape increases the process and cost, and when sewing the zipper teeth, the needle needs to pass through the rigid sheet, increasing the needle's strength requirement; otherwise, there is a risk of needle breakage. Summary of the Invention

[0004] The purpose of this disclosure is to provide an invisible zipper assembly that overcomes at least one defect in the prior art.

[0005] To achieve the above objectives, this disclosure provides an invisible zipper assembly, comprising a zipper, a first sewing member, and a second sewing member. The zipper includes a first zipper tooth, a second zipper tooth, a first zipper tooth carrier, and a second zipper tooth carrier. The first zipper tooth and the second zipper tooth are respectively disposed on the first zipper tooth carrier and the second zipper tooth carrier. The second sewing member is characterized in that its end is bent at least twice in the same clockwise direction. A first bent portion with a multi-layered structure is formed by the penultimate bend, and a second bent portion is formed by a final bend of the multi-layered structure formed by the penultimate bend. The second zipper tooth carrier is at least partially sewn inside the second bent portion of the second sewing member. The first zipper tooth carrier is sewn onto the first sewing member. The first bent portion of the second sewing member is configured to abut against the first sewing member, allowing the first zipper tooth to engage with the second zipper tooth. The entire zipper is externally concealed by the first and second sewing members.

[0006] By bending the end of the second sewing piece at least twice in the same clockwise direction, a large elastic bending rate can be obtained in the end region of the second sewing piece without additional cost. This allows the first bent portion of the second sewing piece to better abut against the first sewing piece and is less prone to deformation, effectively preventing gaps at the contact surface between the first bent portion of the second sewing piece and the first sewing piece. Furthermore, the zipper tooth carrier located at the second bent portion of the second sewing piece is also less prone to deformation, thus achieving a better concealment effect. Since the increased elastic bending rate is achieved solely by bending the second sewing piece itself, without introducing other rigid components, the sewing process is more convenient and eliminates the risk of needle breakage when sewing the zipper teeth together with the zipper teeth onto the second sewing piece according to this disclosure.

[0007] In some embodiments, the flexural elasticity of the first sewing member in its unbent state can be greater than that of the second sewing member. Thus, the flexural elasticity of the first sewing member in its unbent state can be coordinated with the elastic flexural rate at the end of the second sewing member after it has been bent at the end. Furthermore, since no other rigid components are introduced, the sewing process is more convenient and eliminates the risk of needle breakage when sewing the zipper teeth together with the zipper teeth onto the first sewing member according to this disclosure.

[0008] In some embodiments, the flexural elasticity of the first sewn element may be greater than or equal to 1.5 times that of the second sewn element. Preferably, the flexural elasticity of the first sewn element is 2 times, particularly preferably 2.5 times, and especially particularly 3 times that of the second sewn element.

[0009] In some embodiments, the first sewing member can be bent into a substantially L-shape to form a first bent portion of the first sewing member, and the first bent portions of the second sewing member and the first bent portions of the first sewing member abut against each other at their respective bends. By bending the first sewing member into a substantially L-shape, the bending elasticity can also be increased at the first bent portion of the first sewing member, thereby further improving the concealment effect of the concealed zipper.

[0010] In some embodiments, the mating surfaces of the first and second zipper teeth can be flush with the abutting surfaces of the first bend of the first sewn part and the first bend of the second sewn part. Therefore, when performing the engagement operation of the two zipper teeth, the first and second zipper teeth can be engaged more conveniently and intuitively.

[0011] In some embodiments, the mating surfaces of the first and second zipper teeth may be offset from the abutting surfaces of the first bend of the first sewing member and the first bend of the second sewing member. Therefore, the mating surfaces of the first and second zipper teeth, i.e., the center line of the concealed zipper, can be directly covered either by the first sewing member or by the second sewing member, thereby achieving a better concealment effect.

[0012] In some embodiments, the thickness of the first sewing element may be greater than the thickness of the second sewing element.

[0013] In some embodiments, the first sewing piece may have a composite structure, which includes at least a surface structure and a base structure. The flexural elastic modulus of the surface structure, the base structure, or the composite structure composed of both the surface structure and the base structure is greater than that of the second sewing piece. By using a composite structure, more flexible material selection can be achieved, utilizing different materials to realize different functions. For example, the base structure of the composite structure can perform functions related to flexural elastic modulus, while the surface structure can perform functions related to aesthetics.

[0014] In some embodiments, the first sewing member may have a greater rate of flexural elasticity, at least in the contact section that contacts the first zipper tooth carrier, than the second sewing member. Preferably, the first sewing member has a greater rate of flexural elasticity than the second sewing member only in the contact section that contacts the first zipper tooth carrier. This allows for targeted reinforcement of the contact section, thereby better controlling costs.

[0015] In some embodiments, the first sewn element has a small elastic curvature in the section where it does not contact the first zipper tooth carrier. Therefore, the first sewn element can be bent more easily and effectively in areas other than where the zipper tooth carrier is located. For example, when the first sewn element needs to be applied to other objects, better adhesion can be achieved, and wrinkles are less likely to occur during bending.

[0016] In some embodiments, the second bend of the second sewn member may be substantially L-shaped or U-shaped. Attached Figure Description

[0017] The present disclosure will be further described below with reference to the illustrative drawings and by means of exemplary embodiments.

[0018] in:

[0019] Figure 1 This is a schematic diagram of a first embodiment of the invisible zipper assembly according to the present disclosure;

[0020] Figure 2 yes Figure 1 A detailed structural diagram of the invisible zipper assembly;

[0021] Figure 3 This is a schematic diagram of a second embodiment of the invisible zipper assembly according to the present disclosure;

[0022] Figure 4 yes Figure 3 A detailed structural diagram of the invisible zipper assembly;

[0023] Figure 5 This is a schematic diagram of a third embodiment of the invisible zipper assembly according to the present disclosure;

[0024] Figure 6 This is a schematic diagram of a fourth embodiment of the invisible zipper assembly according to the present disclosure;

[0025] Figure 7 This is a schematic diagram of the fifth embodiment of the invisible zipper assembly according to the present disclosure;

[0026] Figure 8 This is a rear view of a seat cover that uses the concealed zipper assembly according to this disclosure;

[0027] Figure 9 This is a rearward perspective view of a seat cover that utilizes the concealed zipper assembly according to this disclosure;

[0028] Figure 10a This is a schematic diagram of a test piece used to determine the flexural modulus;

[0029] Figure 10b These are schematic diagrams showing the test results of two different test pieces. Detailed Implementation

[0030] The following uses Figures 1 to 7 The concealed zipper assembly according to this disclosure is described in detail. In this specification, the direction of zipper pulling on the plane where the zipper body is located is referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction on the plane where the zipper body is located is referred to as the transverse direction.

[0031] Figure 1 A schematic diagram of a first embodiment of the invisible zipper assembly according to the present disclosure is shown. Figure 2 yes Figure 1 A detailed structural diagram of the invisible zipper component.

[0032] like Figure 1 and Figure 2As shown, in the first embodiment, the concealed zipper assembly includes a zipper, a first sewing piece 1, and a second sewing piece 2. The zipper includes a first zipper tooth 14 and a second zipper tooth 24, as well as a first zipper tooth carrier 13 and a second zipper tooth carrier 23. The zipper can be constructed as a nylon zipper (also known as a Velcro zipper). The first zipper tooth 14 and the second zipper tooth 24 can be respectively disposed (e.g., by sewing) on ​​the first zipper tooth carrier 13 and the second zipper tooth carrier 23. The first zipper tooth carrier 13 and the second zipper tooth carrier 23 can be, for example, zipper tape. The end of the second sewing piece 2 is bent twice in a counterclockwise direction. The first bend forms a first bent portion 21 with a double-layer structure in the second sewing piece 2, and the second bent portion 22 is formed by a second bend of the double-layer structure formed by the first bend. Figure 2 As shown more clearly in the diagram, the first bend 21 of the second sewing piece 2 is formed by bending approximately 180°, while the second bend 22 of the second sewing piece 2 is essentially U-shaped. It is understood that the ends of the second sewing piece 2 can also be bent clockwise as needed.

[0033] In some embodiments, the end of the second sewn piece 2 may be bent more than twice, for example, three times or more. Thus, by bending more than twice, better end bending resistance can be obtained, thereby achieving a better concealment effect. When the end of the second sewn piece 2 is bent twice in a counter-clockwise direction, the penultimate bend is referred to herein as the first bend, and the last bend as the second bend. When the end of the second sewn piece 2 is bent three times, the second sewn piece 2 forms a first bent portion 21 with a four-layer structure; the penultimate bend is referred to herein as the second bend, and the last bend as the third bend.

[0034] In the first embodiment, the second zipper tooth carrier 23 may extend laterally over substantially the entire second bend 22. In some embodiments, the second zipper tooth carrier 23 may also extend laterally over a portion of the second bend 22. For example, the second zipper tooth carrier 23 may extend laterally over half of the second bend 22. The second zipper tooth carrier 23 is sewn inside the second bend 22 of the second sewing member 2.

[0035] In the first embodiment, the first sewn piece 1 is not bent and is therefore substantially flat. Without bending, the flexural elasticity of the first sewn piece 1 is substantially twice that of the second sewn piece 2. In some embodiments, without bending, the flexural elasticity of the first sewn piece 1 may also be 2.5 times, 3 times, or more than that of the second sewn piece 2.

[0036] Generally speaking, the higher the flexural modulus, the less likely it is to bend. Within the scope of this disclosure, the flexural modulus of different components can be determined using a test method similar to the cantilever beam bending test. Figure 10a As shown, in order to determine the flexural modulus of the component, a test piece 3 needs to be prepared first. This test piece consists of two parts: a clamping part 31 and an angle measuring part 32. The clamping part 31 is as follows: Figure 10b The experimental schematic diagram shows that the angle measuring unit 32 is clamped by a test fixture during the test and suspended outside to observe the angle change due to gravity within a specified time. In this test method, the length l and width w of the angle measuring unit 32 are specified, and the thickness d and material of the test piece are changed to observe the effect of thickness and material on the flexural modulus of the test piece. The material variable involves not only the material composition but also, for example, the arrangement of materials when anisotropic materials are used. The length l of the angle measuring unit 32 can be, for example, 200 mm, and its width w can be, for example, 100 mm. During the test, the angle change of the angle measuring unit 32 can be observed within a specified time, for example, 1 minute. Figure 10b As shown, the angle between the lower side of the angle measuring part of the first test piece 33 and the end face of the fixture is α1, and the angle between the lower side of the angle measuring part of the second test piece 34 and the end face of the fixture is α2, where α2 is greater than α1. The test results show that the bending elastic modulus of the second test piece 34 is greater than that of the first test piece 33.

[0037] The following conclusions can be drawn from the experimental methods disclosed herein: With the material remaining constant, increasing the component thickness can improve the flexural modulus of the component; with the thickness remaining constant, using a material with a higher flexural modulus of elasticity can improve the flexural modulus of the component. To obtain a higher flexural modulus of elasticity, composite materials or composite structures are preferably used. For example, the first component can be made of fabric, and the second component can be made of fabric and leather, wherein the flexural modulus of elasticity of leather is greater than that of fabric. Thus, the second component, composed of a composite material including fabric and leather, has a greater flexural modulus of elasticity than the first component, which is composed solely of fabric. Furthermore, when the component uses anisotropic materials, such as fibrous materials, the flexural modulus of elasticity of the component can also be changed by the layup direction or weaving method of the fibrous materials, wherein the weaving method can involve plain weave, twill weave, and satin weave, etc.

[0038] In this disclosure, the thickness of the first sewing member 1 is greater than the thickness of the second sewing member 2. For example, the thickness of the first sewing member 1 is approximately twice the thickness of the second sewing member 2. In some embodiments, the first sewing member 1 may also be made of a harder, i.e., less flexible material than the second sewing member 2. In some embodiments, the first sewing member 1 may also employ a composite structure, which may include a base structure and a surface structure, thereby achieving an increased flexural modulus through at least one structure or a combination of two structures in the composite structure. For example, the base structure may have a greater thickness and / or be made of a harder material, while the surface structure may be a decorative layer, such as a decorative layer made of Alcantata material, making the second decorative layer appear more aesthetically pleasing. As another example, the base structure of the first sewing member may be made of fabric, the surface structure may be made of leather, and the second sewing member may be made solely of fabric, wherein the flexural modulus of leather is greater than that of the fabric. Thus, when the thicknesses of the first and second sewing members are the same, the flexural modulus of the first sewing member employing the composite structure is generally greater than that of the second sewing member. In some embodiments, the second sewing element 2 may also have a composite structure.

[0039] In the first embodiment, the first zipper tooth carrier 13 is sewn onto the unbent end of the first sewing member 1. The first bent portion 21 of the second sewing member 2 abuts against the first sewing member 1, allowing the first zipper tooth 14 to engage with the second zipper tooth 24. Figure 1 As shown, when the zipper teeth of the invisible zipper assembly are engaged, the entire zipper is covered from the outside by the first sewing piece 1 and the second sewing piece 2, so that the internal zipper teeth cannot be seen from the outside and thus a good invisible effect is achieved.

[0040] Figure 3 This is a schematic diagram of a second embodiment of the invisible zipper assembly according to the present disclosure. Figure 4 yes Figure 3 A detailed structural diagram of the invisible zipper component.

[0041] like Figure 3 and Figure 4 As shown, the difference between the second embodiment and the first embodiment is that in the second embodiment, the second bend 22 of the second sewing member 2 is substantially L-shaped, while the first sewing member 1 is bent into a substantially L-shape, thereby forming the first bend 11 of the first sewing member 1. The first bend 11 of the first sewing member 1 is formed by bending approximately 90°. In other respects, the first embodiment and the second embodiment are substantially the same. The first sewing member 1 is bent into an L-shape at its ends. In some embodiments, the first sewing member 1 may also be bent into an L-shape in non-end regions.

[0042] In the second embodiment, the mating surfaces of the first zipper tooth 14 and the second zipper tooth 24 are flush with the abutting surfaces of the first bend 11 of the first sewing member 1 and the first bend 21 of the second sewing member 2, such as... Figure 3 This is shown schematically. "Flush" means a straight line parallel to and passing through the mating surface that substantially extends through the mating surface of the first zipper tooth 14 and the second zipper tooth 24. Figure 4 In the diagram, the "flush" state is indicated by a dotted line. In the flush arrangement, the first zipper tooth carrier 13 extends over the first bend 11 of the first sewing piece 1 until the bend. Thus, the first zipper tooth 14 on the first zipper tooth carrier 13 and the second zipper tooth 24 on the second zipper tooth carrier 23 essentially engage next to the abutting surfaces of the first bend 11 of the first sewing piece 1 and the first bend 21 of the second sewing piece 2.

[0043] Figure 5 This is a schematic diagram of a third embodiment of the invisible zipper assembly according to the present disclosure.

[0044] Combination Figure 3 and Figure 5 It can be clearly seen that the third embodiment is substantially the same in structure as the second embodiment. The difference between the two embodiments is that, in the third embodiment, the mating surfaces of the first zipper tooth 14 and the second zipper tooth 24 are offset from the abutting surfaces of the first bend 11 of the first sewing member 1 and the first bend 21 of the second sewing member 2. The mating surfaces of the first zipper tooth 14 and the second zipper tooth 24 are offset onto the first bend 11 of the first sewing member 1. For this reason, the first zipper tooth carrier 13 does not extend to the bend in the first bend 11 of the first sewing member 1, while the second zipper tooth carrier 23 extends out of the second bend 22 of the second sewing member 2, so that the first zipper tooth 14 on the first zipper tooth carrier 13 and the second zipper tooth 24 on the second zipper tooth carrier 23 can engage in the region of the first bend 11 of the first sewing member 1. In some embodiments, the mating surfaces of the first zipper tooth 14 and the second zipper tooth 24 may also be offset onto the second bend 22 of the second sewing member 2. Therefore, the first zipper tooth carrier 13 extends out of the first bend 11 of the first sewing member 1, while the second zipper tooth carrier 23 does not extend to the first bend 21 of the second sewing member 2, so that the first zipper tooth 14 on the first zipper tooth carrier 13 and the second zipper tooth 24 on the second zipper tooth carrier 23 can engage in the area of ​​the second bend 22 of the second sewing member 2.

[0045] Figure 6 This is a schematic diagram of a fourth embodiment of the invisible zipper assembly according to the present disclosure.

[0046] The fourth embodiment and the second embodiment are essentially the same in structure. The difference between the two embodiments is that, in the fourth embodiment, the second bend 22 of the second sewing member 2 is essentially constructed as a U-shape.

[0047] Figure 7 This is a schematic diagram of the fifth embodiment of the invisible zipper assembly according to the present disclosure.

[0048] In a fifth embodiment, the first sewing member 1 uses a harder, i.e., less flexible material in the contact section 15 where it contacts the first zipper tooth carrier 13, thereby giving the first sewing member 1 a larger flexural modulus in this contact section 15. In some embodiments, the first sewing member 1 may have a greater thickness in the contact section where it contacts the first zipper tooth carrier 13, by locally increasing the thickness using a multi-layered structure. In some embodiments, the first sewing member 1 may also employ a composite structure as described above in the contact section where it contacts the first zipper tooth carrier 13, thereby increasing the flexural modulus of this local area by making at least one structure in the composite structure have a larger flexural modulus. In some embodiments, the first sewing member 1 has a smaller flexural modulus in the remaining areas where it does not contact the first zipper tooth carrier 13, for example by using a softer material and / or having a smaller thickness, so that the first sewing member 1 can bend more easily in these remaining areas and therefore has better fit, while being less prone to wrinkling when bent.

[0049] Figure 8 This is a rear view of a seat cover that uses the concealed zipper assembly according to this disclosure. Figure 9 This is a rearward perspective view of a seat cover using the concealed zipper assembly according to this disclosure. In this disclosure, the first sewing member 1 and the second sewing member 2 can be respectively configured as a seat cover for a seat or as an intermediate adapter (not shown) sewn onto the seat cover between the seat cover and the zipper teeth, the intermediate adapter typically being disposed inside the respective seat cover. Figure 8 and Figure 9 The diagram shows the first sewing piece 1 and the second sewing piece 2 configured as seat covers. The first sewing piece 1 can be configured as a side seat cover, and the second sewing piece 2 can be configured as a back seat cover. The correspondence between the first sewing piece 1 and the second sewing piece 2 and the seat cover in the diagram is merely illustrative; the first sewing piece 1 and the second sewing piece 2 can also be configured as seat covers for other parts of the seat. Figure 8 and Figure 9 In the embodiment shown, the extending directions of the first sewing member 1 and the second sewing member 2 are substantially perpendicular to each other. This can be achieved using... Figure 6 The concealed zipper assembly of the fourth embodiment is shown. The first zipper tooth 14 and the second zipper tooth 24 are in... Figure 8 and Figure 9The concealed zipper teeth are schematically indicated by square dots to show their location; in reality, they are not visible. The seat can be a seat in a vehicle or a seat in a home. The vehicle can be a land vehicle, such as a car, truck, bus, or forklift. It can also be a water vehicle, such as a ship. Furthermore, it can be an air vehicle, such as an airplane. The concealed zipper assembly disclosed herein can also be used in the clothing industry.

[0050] It should be noted that the terminology used herein is for illustrative purposes only and is not intended to limit the scope of the invention. The singular forms “a” and “the one” as used herein should include the plural forms unless the context clearly indicates otherwise. It is understood that the terms “comprising” and “including,” and other similar terms, when used in the application documents, specifically describe the presence of the stated operations, elements, and / or components, without excluding the presence or addition of one or more other operations, elements, components, and / or combinations thereof. The term “and / or” as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, similar reference numerals always denote similar elements.

[0051] The thickness of the elements in the accompanying drawings may be exaggerated for clarity. It is also understood that if an element is described as being on, coupled to, or connected to another element, then the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intermediate elements between them. Conversely, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, it indicates that there is no intermediate element. Other terms used to describe relationships between elements should be interpreted similarly, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," etc.

[0052] Terms such as “top,” “bottom,” “above,” “below,” “over,” “under,” etc., are used to describe the relationship of one element, layer, or region relative to another element, layer, or region, as shown in the accompanying drawings. It is understood that these terms should also encompass other orientations of the device in addition to those described in the accompanying drawings.

[0053] It is understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Thus, a first element may be referred to as a second element without departing from the teachings of this disclosure.

[0054] It can also be considered that all the exemplary embodiments disclosed herein can be arbitrarily combined with each other. Furthermore, all individual technical features in this application can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All technically feasible combinations of features are the technical content described in this application.

[0055] Finally, it should be noted that the above embodiments are merely for understanding this disclosure and do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art can make modifications based on the above embodiments, and these modifications will not depart from the scope of protection of this disclosure.

Claims

1. A concealed zipper assembly, the concealed zipper assembly comprising a zipper, a first sewing member, and a second sewing member, the zipper comprising a first zipper tooth and a second zipper tooth, and a first zipper tooth carrier and a second zipper tooth carrier, the first zipper tooth and the second zipper tooth being respectively disposed on the first zipper tooth carrier and the second zipper tooth carrier, characterized in that, The end of the second sewn piece is bent at least twice in the same clockwise direction. The penultimate bend forms a first bend with a multi-layered structure, and a second bend is formed by a final bend of the multi-layered structure formed by the penultimate bend. The second zipper tooth carrier is at least partially sewn inside the second bend of the second sewn piece. The first zipper tooth carrier is sewn onto the first sewn piece. The first bend of the second sewn piece is configured to abut against the first sewn piece, allowing the first zipper tooth to engage with the second zipper tooth. The zipper as a whole is externally concealed by both the first and second sewn pieces. In its unbent state, the bending elasticity of the first sewn piece is greater than that of the second sewn piece.

2. The concealed zipper assembly of claim 1, wherein, The flexural elasticity of the first sewn part is greater than or equal to 1.5 times that of the flexural elasticity of the second sewn part.

3. The concealed zipper assembly according to claim 1 or 2, wherein The first sewn piece is bent into a substantially L-shape, thereby forming a first bent portion of the first sewn piece, and the first bent portions of the second sewn piece and the first bent portions of the first sewn piece abut against each other at their respective bends.

4. The concealed zipper assembly of claim 3, wherein, The mating surfaces of the first zipper tooth and the second zipper tooth are flush with the abutting surfaces of the first bend of the first sewing piece and the first bend of the second sewing piece.

5. The concealed zipper assembly of claim 3, wherein, The mating surfaces of the first zipper tooth and the second zipper tooth are offset from the contact surfaces of the first bend of the first sewing piece and the first bend of the second sewing piece.

6. The hidden zipper assembly of claim 1, wherein, The thickness of the first sewn part is greater than the thickness of the second sewn part.

7. The hidden zipper assembly of claim 1, wherein, The first sewing piece has a composite structure, which includes at least a surface structure and a base structure. The flexural elasticity of the surface structure, the base structure, or the composite structure consisting of the surface structure and the base structure is greater than that of the second sewing piece.

8. The hidden zipper assembly of claim 1, wherein, The first sewing component has a greater flexural elastic modulus than the second sewing component, at least in the contact section where it contacts the first zipper tooth carrier.

9. The concealed zipper assembly of claim 8, wherein, The first sewing piece has a small elastic curvature in the section that does not contact the first zipper tooth carrier.

10. The concealed zipper assembly of claim 1 or 2, wherein, The second bend of the second sewn piece is basically constructed in an L-shape or a U-shape.

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