A snap

Abstract

The utility model discloses a press button applied to press button technical field, include: female press button, including riveting connection's female buckle and first binding spare, female buckle is equipped with first binding hole, first binding spare is inserted into first binding hole and forms first binding hem at the end, male press button, including riveting connection's male buckle and second binding spare, male buckle includes fixed part and concave part, concave part is equipped with buckle part, the bottom surface of buckle part is equipped with accommodation space, and the inside of buckle part forms cavity, fixed part is equipped with support part, when fixed part is connected with concave part, support part abuts at the inner wall of cavity, when female press button is buckled with male press button, first binding hem sinks into accommodation space. Both can alleviate male press button deformation after binding, and also satisfy the thickness of male press button and female press button after connecting is relatively thin.

Description

Technical Field

[0001] This utility model relates to the field of snap fastener technology, and in particular to a snap fastener. Background Technology

[0002] Snap fasteners, with their quick-opening and closing advantage, are widely used as reusable fasteners in flexible products such as clothing and bags. For a typical structure, please refer to the appendix. Figure 1 The male snap fastener consists of a male fastener 01 and a rivet, while the female snap fastener consists of a female fastener and another rivet. During installation, the rivet shank passes through the fabric 02 and then rolls or expands to fix the male fastener 01 and the female fastener to the fabric 02 on both sides. However, the prior art has at least the following drawbacks:

[0003] Male fastener 01 typically requires a through hole in the center so that the rivet shank can pass through and be rolled up for riveting, such as Figure 1 As shown. The impact force at the moment of binding acts directly on the thin wall of the hole edge, causing the male snap fastener 01 to easily collapse, warp, or crack at the hole edge. The deformed male snap fastener and female snap fastener fit too tightly or get stuck, and the connection and separation functions are significantly reduced.

[0004] To avoid the above problems, some solutions have changed the way the male fastener 01 and the rivet are attached. The male fastener 01 does not need to be drilled, but the fastening surface of the male fastener 01 is flat. After fastening, the rivet head inside the female fastener protrudes from the fastening surface. Sufficient clearance height must be reserved between the fastening surfaces of the male fastener 01 and the female fastener, which makes it impossible to reduce the overall thickness of the fastening and makes it difficult to meet the ultra-thin requirements of high-end shirts and other products.

[0005] Therefore, how to eliminate the risk of deformation caused by the opening of the male thread without reducing the connection strength, and avoid the additional occupation of the fastening thickness by the rivet head, is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The purpose of this utility model is to provide a snap fastener that can alleviate the deformation of the male snap fastener after binding, and also meet the requirement that the thickness of the male snap fastener and the female snap fastener is relatively thin after connection.

[0007] To solve the above-mentioned technical problems, this utility model provides a snap fastener, comprising:

[0008] A female snap fastener includes a female snap fastener and a first fastening element that are riveted together; the female snap fastener is provided with a first fastening hole, and the first fastening element extends into the first fastening hole and forms a first fastening curl at its end;

[0009] A male snap fastener includes a male snap fastener connected by riveting and a second fastening component; the male snap fastener includes a fixing component and a concave component, the concave component has a fastening portion, the bottom surface of the fastening portion has a receiving space, and the inside of the fastening portion forms a cavity; the fixing component has a supporting portion;

[0010] When the fixing member is connected to the concave member, the supporting part abuts against the inner wall of the cavity;

[0011] When the female snap fastener and the male snap fastener are engaged, the first binding edge sinks into the receiving space.

[0012] Optionally, the receiving space is a concave arc surface recessed inward from the bottom surface of the fastening part.

[0013] Optionally, the female buckle is provided with a fastening groove, and an elastic component is embedded in the fastening groove; the fastening part is inserted into the fastening groove and engages with the elastic component.

[0014] The first binding hole is coaxially connected to the fastening groove, the middle part of the concave arc surface is lower than the outer periphery, and the first binding edge abuts against the lower middle part of the concave arc surface in the fastened state.

[0015] Optionally, the support portion includes a raised arc segment that protrudes toward the bottom surface of the fastening portion, and when the fastener is connected to the concave part, the raised arc segment abuts against the bottom surface of the fastening portion.

[0016] Optionally, the inner wall of the cavity is covered with a buffer pad, and the support part indirectly abuts against the inner wall of the cavity through the buffer pad.

[0017] Optionally, after the fastener is connected to the concave part, an annular gap is maintained between the raised arc segment and the inner wall of the cavity to provide elastic deformation allowance when the male buckle is riveted to the second fastener.

[0018] Optionally, the concave member has a covered opening on the outer periphery of the root of the fastening part, and a corner is formed between the covered opening and the fastening part;

[0019] The outer edge of the raised arc segment bends outward to form a edging portion, and the support portion also includes a corner portion located between the edging portion and the raised arc segment;

[0020] When the fastener is connected to the concave part, the edge portion wraps around and presses against the opening portion, and the corner portion abuts against the bend portion.

[0021] Optionally, the corner portion is constructed as a first concave arc segment, the turn portion is constructed as a second concave arc segment, and the curvature of the second concave arc segment is greater than the curvature of the first concave arc segment, so that a progressive interference fit is formed between the corner portion and the turn portion.

[0022] Optionally, the inner side of the raised arc segment continues to extend away from the fastening part, and the end is formed into a second binding curl;

[0023] The second binding element has a second binding hole, and the second binding curl is inserted into the second binding hole and riveted to the second binding element.

[0024] Optionally, the second binding component includes a bottom component, a top component, and an intermediate component sandwiched between the two;

[0025] The intermediate component has a tapered guide surface on the side facing the top component, and a positioning groove is provided at the bottom of the tapered guide surface;

[0026] The top member extends inward to form a baffle at the position corresponding to the positioning groove, and the second mounting hole is located on the inner side of the baffle.

[0027] During riveting, the second binding edge slides into the positioning groove along the tapered guide surface, and the top end of the second binding edge abuts against the baffle.

[0028] Compared to existing technologies, the snap fastener of this application features a concave component suspended entirely within the female snap fastener cavity when the male snap fastener inserts into it. Its recessed space accommodates the first binding edge of the female snap fastener, allowing it to fully sink without occupying an additional layer of height. Therefore, the total thickness after fastening is determined by the female snap fastener base, the fabric, and the cavity depth, achieving a thinner profile. The front of the concave component maintains a complete curved surface without any through holes, eliminating the visual discontinuity caused by the central hole in traditional male snap fasteners and avoiding stress concentration at the hole edge under load. This results in a simpler appearance and higher structural strength. Simultaneously, the support portion abuts against the thinner area of ​​the concave component from the inside, distributing riveting impact and daily pulling forces over a larger area. During the fastening process and long-term use, the concave component is less prone to collapse and deformation, thus achieving both no deformation after fastening and a thinner profile after fastening. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a typical male snap fastener in the prior art;

[0031] Figure 2 A schematic diagram of the snap fastener provided in the first specific embodiment of this utility model;

[0032] Figure 3 for Figure 2 A schematic diagram of the structure of the central snap fastener;

[0033] Figure 4 for Figure 2 A structural diagram of the Zhonggong snap fastener;

[0034] Figure 5 for Figure 2 A structural diagram of the second binding component;

[0035] Figure 6 This is a diagram showing the state when the female and male snaps are not engaged.

[0036] Figure 7 Diagram showing the state when the female and male snaps are engaged;

[0037] Figure 8 A schematic diagram showing the connection between the second binding piece and the second binding edge;

[0038] Figure 9 This is a schematic diagram showing the mating of the male snap fastener and the machine-made die during riveting.

[0039] Figure 10 A schematic diagram of the male buckle provided in the second specific embodiment of this utility model;

[0040] Figure 11 This is a schematic diagram of the male buckle provided in the third specific embodiment of this utility model.

[0041] Figure label:

[0042] 1-First binding component; 11-First binding hem; 2-Female buckle; 21-Snap-fit ​​groove; 22-Elastic accessory; 3-Male buckle; 31-Concave part; 32-Fixing part; 33-Corner part; 34-Corner part; 35-Raised arc section; 36-Bag opening; 37-Buffer pad; 321-Second binding hem; 4-Second binding component; 41-Top part; 42-Middle part; 43-Bottom part; 421-Conical guide surface; 422-Positioning groove; 5-Fabric; 6-Machine die; 01-Male buckle; 02-Fabric. Detailed Implementation

[0043] The core of this utility model is to provide a snap fastener that can alleviate the deformation of the male snap fastener after it is attached and can also meet the requirement that the thickness of the male snap fastener and the female snap fastener is relatively thin after they are connected.

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] In one specific embodiment provided by this utility model, please refer to... Figures 2-11 Snap fasteners mainly include female snap fasteners and male snap fasteners.

[0046] The female snap fastener includes a female snap fastener 2 and a first binding member 1 connected by riveting; the female snap fastener 2 is provided with a first binding hole, and the first binding member 1 extends into the first binding hole and forms a first binding curl 11 at the end;

[0047] The male snap fastener includes a male snap fastener 3 connected by riveting and a second binding component 4; the male snap fastener 3 includes a fixing component 32 and a concave component 31, the concave component 31 is provided with a fastening part, the bottom surface of the fastening part is provided with a receiving space, and a cavity is formed inside the fastening part; the fixing component 32 is provided with a supporting part;

[0048] When the fastener 32 is connected to the concave part 31, the support part abuts against the inner wall of the cavity;

[0049] When the female snap and the male snap are engaged, the first binding edge 11 is recessed into the receiving space.

[0050] It should be explained that the snap fastener consists of two main parts: a female snap fastener and a male snap fastener. The two are riveted and fixed to the fabric 5 by their respective fastening parts, and form a relatively thin closed body after fastening.

[0051] The female snap fastener adopts a riveting structure between the female snap fastener 2 and the first fastening component 1. The female snap fastener 2 has a pre-drilled first fastening hole in the center. The first fastening component 1 passes through the fabric 5 and extends into the first fastening hole. The inner end of the first fastening hole is rolled outward to form a first fastening rolled edge 11, thereby clamping the female snap fastener to the fabric 5 on one side. That is, the first fastening component 1 and the female snap fastener 2 clamp the fabric 5 in the middle and fix it by the first fastening rolled edge 11. The first fastening rolled edge 11 becomes the recessed part when it is subsequently engaged with the male snap fastener.

[0052] The male snap fastener is formed by riveting male snap 3 and second binding member 4. Male snap 3 and second binding member 4 sandwich fabric 5 in the middle and are fixed by second binding hem 321. Male snap 3 itself is composed of two parts: concave part 31 and fixing part 32. The center of concave part 31 protrudes outward to form a fastening part, and the bottom surface of the fastening part is concave to form a receiving space. The receiving space is preferably a continuous receiving area formed by the bottom surface of the fastening part being concave inward, and a cavity is left inside the fastening part. The fixing member 32 has a support part. When the fixing member 32 and concave part 31 are assembled, the support part fits against the inner wall of the cavity to form radial support, preventing the concave part 31 from deforming during subsequent riveting or tension, which would cause the fastening part to tilt inward and deform, thus causing the connection between the fastening part and female snap 2 to fail. The outer edge of the fixing member 32 continues to extend and is riveted to the second binding member 4, so that the entire male snap fastener is fixed to the fabric 5 on the other side.

[0053] In use, the male buckle 3 is aligned with the female buckle 2 and pushed in. The elastic component 22 inside the female buckle 2 is first stretched open and then springs back, completing the snap-fit. At the same time, the first binding curl 11 on the female buckle 2 smoothly enters the receiving space at the bottom of the fastening part, forming a hidden storage. Since the first binding curl 11 is completely sunk into the recessed receiving space of the concave part 31, the originally reserved curl height layer is completely eliminated. The female buckle 2 and the male buckle 3 can directly fit together in the thickness direction. The height of the first binding curl no longer overlaps between the fastening surfaces of the male and female buckles 2, and the first binding curl 11 no longer occupies the thickness space after fastening. Therefore, the total thickness after fastening is reduced to the thickness of the female buckle 2 base, the fabric 5 thickness, and the concave depth of the concave part 31, thus significantly reducing the overall height. At the same time, the support part presses against the wall of the cavity from the inside, forming an integrated fixation, improving the resistance to deformation, making the structure more stable, and allowing the concave part 31 to maintain its original curved shape when subjected to lateral tension or impact, avoiding the concavity or warping failure caused by the central opening and thin wall of the traditional male buckle 3.

[0054] In some embodiments, the receiving space is a concave arc surface recessed inward from the bottom of the fastening part. The concave arc surface forms a bowl-shaped cavity, that is, the center is the lowest and the periphery gradually rises, forming a continuous sloping transition. When fastened, the first binding edge 11 slides in along the slope. The depth of the concave arc surface forms a recessed receiving area, and the first binding edge 11 sinks into the concave arc surface. When the fastener 32 is riveted to the second binding part 4, the protruding arc on the inner side of the machine-made die 6 abuts against the concave arc surface of the concave part 31 to prevent the arc of the concave arc surface of the concave part 31 from deforming due to the force during binding.

[0055] The periphery of the concave arc surface is connected to the side wall of the fastening part by a smooth arc surface, so that the first binding edge 11 automatically aligns during the process of entering the receiving area, avoiding skew and jamming; at the same time, the isotropic geometric characteristics of the concave arc surface evenly distribute the concentrated force applied by the first binding edge 11 to the entire concave cavity wall, reducing local stress concentration and preventing the concave part 31 from cracking or permanently deforming due to point stress.

[0056] In some embodiments, the female buckle 2 is provided with a fastening groove 21, and an elastic component 22 is embedded in the fastening groove 21; the fastening part is inserted into the fastening groove 21 and engages with the elastic component 22.

[0057] The first binding hole is coaxially connected to the fastening groove 21. The middle part of the concave arc surface is lower than the outer periphery. The first binding edge 11 abuts against the lower middle part of the concave arc surface when fastened.

[0058] It should be explained that the snap-fit ​​groove 21 of the female buckle 2 and the first binding hole are designed to be vertically connected on the same axis, forming a continuous central channel. That is, the upper section is the snap-fit ​​groove 21, and the lower section is the first binding hole. A ring of elastic fittings 22 is embedded in the snap-fit ​​groove 21. The elastic fittings 22 can be ring-shaped springs or three-pronged springs, and their inner diameter is slightly smaller than the outer diameter of the snap-fit ​​part. When the snap-fit ​​part of the male buckle 3 is inserted, the elastic fittings 22 are first stretched open and then spring back to complete the snap-fit ​​locking.

[0059] Meanwhile, the first binding component 1 is rolled up on the side of the first binding hole near the fastening groove 21 to form a first binding curl 11, which is located within the central channel. Since the receiving space of the concave component 31 uses a concave arc surface, and the center is lower than the outer periphery, the first binding curl 11 is guided to this lower position during fastening, and the top of the first binding curl 11 fits against the concave arc surface of the receiving space. In this way, the locking force provided by the elastic component 22 and the adhesion force between the first binding curl 11 and the concave arc surface are distributed vertically along the same axis. The elastic component 22 is responsible for radial locking, while the first binding curl 11 and the concave arc surface are responsible for axial limiting. They do not interfere with each other but reinforce each other, making it difficult for the component to come out on its own even under repeated pulling or lateral shaking, thus improving fastening stability while maintaining an ultra-thin thickness. The first binding edge 11 is hidden at the lowest point and no longer protrudes from the bottom surface of the female buckle 2. The male buckle 3 and the female buckle 2 can be directly close together, eliminating the need for the traditionally required pre-reserved edge thickness layer.

[0060] With the above structure, the snap-fit ​​feels crisp and the locking is reliable. There are no visible rolled edges on the surface. The overall thickness is significantly reduced by eliminating one layer of height. Moreover, all key stress points are located on the same center line, so it is not easy to wobble or loosen after long-term use.

[0061] In a preferred embodiment, the top contour of the first binding edge 11 is formed as a convex arc surface, and the convex arc surface and the concave arc surface are coaxially arranged. Preferably, the convex arc surface and the concave arc surface of the concave part 31 have the same center of curvature and axis of rotation.

[0062] When the male buckle 3 and the female buckle 2 are engaged, the convex arc surface slides axially into the concave arc surface, forming a coaxial and conjugate arc pair geometrically. That is, the lowest point of the convex arc surface contacts the lowest point of the concave arc surface first. As the insertion depth increases, the contact ring gradually expands outward from the center, eventually achieving continuous surface-to-surface contact throughout the entire arc area. This engagement method disperses the concentrated force that might have been concentrated at the apex of the first binding edge 11 into a circumferential pressure evenly distributed along the arc, reducing local pressure and avoiding the risk of the top of the first binding edge 11 crushing the concave arc surface or undergoing plastic deformation itself. At the same time, the coaxial characteristic of the arc pair gives the system automatic centering capability. Any slight eccentricity or tilt will be corrected by curvature during the sliding process, ensuring that the center lines of the male buckle 3 and the female buckle 2 coincide after engagement, preventing unilateral wear or jamming caused by misalignment.

[0063] Because the contact surface is a continuous arc without any sharp angles, the locking feel is smoother. The peak insertion force is spread out throughout the entire stroke, and the user can lock the device by applying a stable pushing force. When unlocking, the elastic accessory 22 rebounds and drives the concave part 31 to move backward, and the arc part separates along the original path, without the jamming or abnormal noise caused by the friction between the traditional rolled edge and the flat surface.

[0064] The convex arc surface at the top of the first binding edge 11 and the concave arc surface of the accommodating space are closely aligned on the same axis, which not only achieves concealed storage and reduces the overall thickness, but also improves the uniformity of force distribution and service life through surface-to-surface bonding, making the snaps thinner while being more robust and reliable.

[0065] In some embodiments, the support portion includes a raised arc segment 35 that protrudes toward the bottom surface of the fastening portion. When the fastener 32 is connected to the concave member 31, the raised arc segment 35 abuts against the bottom surface of the fastening portion.

[0066] It should be explained that the fastener 32 has a raised arc segment 35 on the side facing the bottom surface of the fastening part. When the fastener 32 and the concave part 31 are assembled, this raised arc segment 35 forms a supporting contact with the bottom surface of the fastening part. The center of curvature of the raised arc segment 35 is located on one side of the fastening part, and its outer surface axially pushes against the bottom surface of the cavity, making contact first. As the pressure continues, the contact area expands into a closed annular band along the arc normal, thereby evenly distributing the clamping force from the fastener 32 to the weakest area of ​​the concave part 31. Because the contact band is arc-shaped, the concave part 31 can obtain reverse support from the raised arc segment 35 when subjected to lateral tension or edge impact, preventing the central concave area from collapsing or permanently deforming. At the same time, the arc contact gives the male snap a certain elastic margin, which can absorb some impact energy during riveting and reduce the risk of local yielding of the concave part 31.

[0067] After the male buckle 3 and the second binding part 4 are riveted together, the raised arc segment 35 and the bottom surface of the fastening part continue to support each other. Even if the fabric 5 is repeatedly stretched, causing the fastener 32 to make a slight displacement, the curved surface characteristics of the raised arc segment 35 can automatically adjust the contact position, maintain stable support force, and avoid stress concentration and fatigue cracks.

[0068] Through this raised arc segment 35 abutting structure, the concave part 31 can achieve high rigidity without additional thickening or reinforcement. The overall thickness after fastening is thus further reduced, while ensuring the shape integrity and locking reliability under long-term use.

[0069] In some embodiments, the inner wall of the cavity is covered with a cushioning pad 37, and the support portion indirectly abuts against the inner wall of the cavity through the cushioning pad 37.

[0070] It should be explained that a buffer pad 37 is inserted between the inner wall of the cavity and the support. The buffer pad 37 conforms to the curved contour of the inner wall of the cavity, forming a soft intermediate layer. When the fastener 32 and the concave part 31 are combined, the support first presses the buffer pad 37, and then the buffer pad 37 evenly transfers the load to the concave part 31. Because the buffer pad 37 is compressible, the peak impact force during riveting is partially absorbed, and the weakest concave area of ​​the concave part 31 is spared from directly bearing instantaneous high pressure, thereby effectively suppressing local collapse or permanent deformation.

[0071] The elastic recovery characteristics of the buffer pad 37 can continuously fill the micro gaps caused by vibration, thermal expansion and contraction or stretching of the fabric 5, preventing relative slippage or fretting wear between the support and the wall of the cavity; at the same time, the continuous elastic support formed by the buffer pad 37 along the concave arc surface allows the concave part 31 to maintain its original curved shape when subjected to lateral tension, and it is not easy to deform.

[0072] Through this indirect contact method, the concave part 31 obtains additional elastic protection while maintaining an ultra-thin wall thickness, which not only ensures the geometric accuracy after binding, but also extends the service life of repeated fastening.

[0073] In some embodiments, after the fastener 32 is connected to the concave member 31, an annular gap is maintained between the raised arc segment 35 and the inner wall of the cavity to provide elastic deformation allowance when the male buckle 3 is riveted to the second fastener 4.

[0074] It should be explained that after the fastener 32 and the concave part 31 are assembled, a continuous annular gap is maintained between the raised arc segment 35 and the inner wall of the cavity, forming a controllable non-wall-attached state. This annular gap is not an assembly error, but a pre-designed elastic deformation allowance.

[0075] When the male buckle 3 is riveted to the second binding component 4, the impact force is transmitted to the raised arc segment 35 through the fastener 32. The raised arc segment 35 undergoes a slight outward expansion, and the gap provides space for it to deform outward, preventing instantaneous stress from acting directly on the weakest recessed area of ​​the concave component 31. This cuts off the rigid transmission path of the impact force along the radial direction, acting as a buffer zone and further reducing the risk of micro-cracks. Even if the riveting force fluctuates, the outward expansion of the raised arc segment 35 can be adaptively adjusted within the gap range to ensure that the concave component 31 has a consistent appearance and stable dimensions.

[0076] As the riveting process ends, the raised arc segment 35 abuts against the inner wall of the cavity. The raised arc segment 35 and the bottom surface of the fastening part maintain continuous support. The concave part 31 maintains its original curved surface profile, achieving high resistance to deformation without additional thickening or reinforcing ribs.

[0077] Through this reserved gap structure, the concave part 31 can maintain an ultra-thin wall thickness while taking into account both the elasticity during riveting and the shape retention during use, thus achieving a connection effect that is both lightweight and reliable.

[0078] In some embodiments, the concave member 31 integrally extends an annular opening 36 around the outer circumference of the root of the fastening portion. The opening 36 forms a corner 34 between itself and the sidewall of the fastening portion, providing a positioning reference for the subsequent edging portion and also geometrically forming a local reinforcing ring. The outer edge of the raised arc segment 35 of the fastener 32 continues to bend outward to form an edging portion. The edging portion and the raised arc segment 35 are connected by a corner portion 33, forming a convex-concave pairing support relationship.

[0079] When the fastener 32 is pressed against the concave part 31, the edge wrapping portion radially wraps around and presses against the opening portion 36, generating a circumferential clamping force, which gives the root of the concave part 31 additional radial constraint. At the same time, the corner portion 33 abuts against the corner portion 34, that is, the corner portion 33 and the corner portion 34 fit together on the circumference to form a second support ring. This fitting position is exactly located at the outer edge of the wall thickness area of ​​the fastening part, which can disperse the top holding force from the raised arc segment 35 to the corner portion 34, and then transmit it to the entire outer periphery of the concave part 31 through the opening portion 36, avoiding stress concentration that could lead to root cracking.

[0080] During riveting, even if the concave part 31 is subjected to lateral tension or edge impact, the mutual contact between the corner part 34 and the corner part 33 can prevent the fastening part from puffing outward and keep the concave contour unchanged.

[0081] Through the above structure, the concave part 31 achieves root reinforcement and shape retention without increasing the wall thickness, making the snap button thinner while having higher resistance to deformation and durability.

[0082] In some embodiments, the corner portion 34 is configured as a first concave arc segment, and the corner portion 33 is configured as a second concave arc segment, with the curvature of the second concave arc segment being greater than that of the first concave arc segment. This causes the corner portion 33 and the corner portion 34 to form a narrow ring contact on the circumference during the initial insertion stage. As the fixing member 32 and the concave member 31 continue to be pressed relative to each other, the second concave arc segment gradually expands the first concave arc segment, and the contact zone expands from a line to a surface, thus forming a progressive interference fit between the corner portion 33 and the corner portion 34.

[0083] The progressive interference first provides guidance, ensuring that the fastener 32 and the concave part 31 automatically align, avoiding eccentric jamming. Subsequently, the radial component force caused by the curvature difference continuously increases, causing the clamping force of the edge portion on the opening portion 36 to increase synchronously, forming a self-reinforcing annular compressive stress, effectively suppressing the outward deformation of the root of the concave part 31 under tension or lateral impact. As the interference gradually builds up along the insertion depth, the peak stress is distributed on a circular arc path, preventing the occurrence of shear microcracks. At the same time, the second concave arc segment and the first concave arc segment form a continuous curved surface transition after being fully fitted, which not only maintains the smooth and beautiful outer wall, but also forms a hidden reinforcing ring in the corner area, improving the fatigue life of the root of the concave part 31.

[0084] Through the above structure, the fastener 32 and the concave part 31 achieve a connection effect that becomes tighter and more stable with use without the aid of additional fasteners, so that the snap button can obtain high resistance to deformation and long-term reliability while maintaining ultra-thin wall thickness.

[0085] In some embodiments, the inner side of the raised arc segment 35 continues to extend away from the fastening portion and ends in a second binding curl 321.

[0086] The second binding component 4 is provided with a second binding hole, and the second binding curl 321 is inserted into the second binding hole and riveted to the second binding component 4.

[0087] It should be explained that the inner side of the raised arc segment 35 does not terminate at the bottom of the cavity, but continues to extend away from the fastening part, forming a smooth extension wall. This extension wall curls outward at its end, forming the second binding curl 321. This continuous structure allows the fastener 32 to serve both internal support and external riveting functions, eliminating the need for additional connectors.

[0088] The second binding part 4 has a second binding hole at the corresponding position. When the male buckle 3 is assembled with the fabric 5, the second binding hem 321 passes through the fabric 5 and is inserted into the second binding hole. Then it expands outward at the opening of the hole to form a firm riveting joint with the second binding part 4.

[0089] Since the second binding edge 321 and the raised arc section 35 are made of the same piece of material, the tensile force generated during the rolling process is transmitted along the extension wall to the raised arc section 35. The raised arc section 35 is supported in the opposite direction because it has abutted against the bottom surface of the fastening part, which not only prevents itself from being stretched and deformed, but also evenly distributes the riveting force to the entire cavity wall of the concave part 31, avoiding local deformation. At the same time, the extension wall forms a flexible transition section in the axial direction, which can absorb the impact at the moment of riveting and reduce the stress concentration at the root of the concave part 31.

[0090] After riveting, a mechanical interlock is formed between the second binding edge 321 and the second binding part 4, while the raised arc section 35 still maintains the supporting state of the cavity, so that the male buckle 3 will not loosen or rotate during long-term use; and, since the edge rolling, support and riveting functions are integrated into the same fastener 32, the number of parts is reduced and the assembly process is simplified, but higher connection reliability and thinner overall thickness are achieved.

[0091] In some embodiments, the second binding member 4 includes a bottom member 43, a top member 41, and an intermediate member 42 sandwiched between the two, forming a composite matrix capable of withstanding bidirectional forces. The intermediate member 42 has a tapered guide surface 421 on the side facing the top member 41, and a positioning groove 422 is provided at the bottom of the tapered guide surface 421. That is, the tapered guide surface 421 gradually rises from the outer edge to the center and transitions into the positioning groove 422 at the lowest point. The outline of the positioning groove 422 matches the outer arc of the second binding hem 321, and is used to accommodate and define the final position of the hem.

[0092] The top part 41 extends inward to form a baffle at the position corresponding to the positioning groove 422. The baffle is cantilevered, and the second mounting hole is located on the inner side of the baffle. The baffle and the positioning groove 422 form a coaxial stop structure.

[0093] During riveting, the second binding curl 321 slides into the positioning groove 422 along the tapered guide surface 421, and the top of the second binding curl 321 abuts against the baffle. Specifically, during the riveting process, the second binding curl 321 first passes through the fabric 5, then through the second binding hole, and then gradually folds outward under the guidance of the tapered guide surface 421. The second binding curl 321 slides down the inclined surface, and its diameter gradually increases until it falls completely into the positioning groove 422. At this time, the top of the second binding curl 321 axially abuts against the inner side of the baffle, and the baffle becomes a rigid obstacle for the second binding curl 321 to continue to fold outward, forcing the second binding curl 321 to form a full drum-shaped rivet head in the positioning groove 422. Because the positioning groove 422 and the baffle together form a closed circumferential constraint, the riveting impact force is dispersed into circumferential tensile stress, avoiding local cracking of the second binding edge 321. At the same time, the baffle provides clear axial positioning for the abutment of the top of the second binding edge 321, so that the gap between the concave part 31 and the second binding part 4 can be precisely controlled, preventing overpressure from causing warping at the root of the concave part 31. After riveting, the bottom part 43, the middle part 42, and the top part 41 are joined together by being pressed by the drum-shaped rivet head, which not only ensures the connection strength but also makes the appearance surface free of rivet marks. The overall thickness can be further reduced because no additional shims or bosses are needed.

[0094] Through the cooperation of the tapered guide surface 421, the positioning groove 422 and the baffle, the second binding edge 321 can be accurately positioned, uniformly formed and reliably locked during stamping, so that the snap button can achieve higher pull-out resistance and fatigue life in a thinner size.

[0095] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0096] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A snap fastener, characterized in that, include: The female snap fastener includes a female snap fastener (2) connected by riveting and a first binding member (1); the female snap fastener (2) is provided with a first binding hole, and the first binding member (1) extends into the first binding hole and forms a first binding curl (11) at its end. The male snap fastener includes a male snap fastener (3) connected by riveting and a second fastening component (4); the male snap fastener (3) includes a fixing component (32) and a concave component (31), the concave component (31) is provided with a fastening part, the bottom surface of the fastening part is provided with a receiving space, and a cavity is formed inside the fastening part; the fixing component (32) is provided with a supporting part; When the fixing member (32) is connected to the concave member (31), the supporting part abuts against the inner wall of the cavity; When the female snap fastener is engaged with the male snap fastener, the first binding hem (11) sinks into the receiving space.

2. The snap fastener according to claim 1, characterized in that, The accommodating space is an inwardly recessed arc surface extending from the bottom of the fastening part.

3. The snap fastener according to claim 2, characterized in that, The female buckle (2) is provided with a fastening groove (21), and an elastic component (22) is embedded in the fastening groove (21); the fastening part is inserted into the fastening groove (21) and engages with the elastic component (22); The first binding hole is coaxially connected with the fastening groove (21), the middle part of the concave arc surface is lower than the outer periphery, and the first binding edge (11) abuts against the lower part of the middle of the concave arc surface in the fastening state.

4. The snap fastener according to any one of claims 1-3, characterized in that, The support portion includes a raised arc segment (35) that protrudes toward the bottom surface of the fastening portion. When the fastener (32) is connected to the concave part (31), the raised arc segment (35) abuts against the bottom surface of the fastening portion.

5. The snap fastener according to claim 4, characterized in that, The inner wall of the cavity is covered with a buffer pad (37), and the support part indirectly abuts against the inner wall of the cavity through the buffer pad (37).

6. The snap fastener according to claim 4, characterized in that, After the fastener (32) is connected to the concave part (31), an annular gap is maintained between the raised arc segment (35) and the inner wall of the cavity to provide elastic deformation allowance when the male buckle (3) is riveted to the second fastener (4).

7. The snap fastener according to claim 4, characterized in that, The concave part (31) has a rim (36) on the outer periphery of the root of the fastening part, and a corner (34) is formed between the rim (36) and the fastening part. The outer edge of the raised arc segment (35) is bent outward to form a edging portion, and the support portion also includes a corner portion (33) located between the edging portion and the raised arc segment (35). When the fastener (32) is connected to the concave part (31), the edge wrapping part wraps around and presses the opening part (36), and the corner part (33) abuts against the corner part (34).

8. The snap fastener according to claim 7, characterized in that, The corner portion (34) is constructed as a first concave arc segment, and the corner portion (33) is constructed as a second concave arc segment, and the curvature of the second concave arc segment is greater than the curvature of the first concave arc segment, so that a progressive interference fit is formed between the corner portion (33) and the corner portion (34).

9. The snap fastener according to claim 4, characterized in that, The inner side of the raised arc segment (35) continues to extend away from the fastening part, and the end is formed into a second binding curl (321). The second binding component (4) is provided with a second binding hole, and the second binding roll (321) is inserted into the second binding hole and riveted to the second binding component (4).

10. The snap fastener according to claim 9, characterized in that, The second binding component (4) includes a bottom component (43), a top component (41), and an intermediate component (42) sandwiched between the two. The intermediate component (42) has a tapered guide surface (421) on the side facing the top component (41), and a positioning groove (422) is provided at the bottom of the tapered guide surface (421). The top piece (41) extends inward into a baffle at the position corresponding to the positioning groove (422), and the second mounting hole is located on the inner side of the baffle; During riveting, the second binding edge (321) slides into the positioning groove (422) along the tapered guide surface (421), and the top end of the second binding edge (321) abuts against the baffle.

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