Snap fastener easy to enter and difficult to exit

Abstract

The snap fastener comprises a first fastener surface, a slingshot cup, a second fastener surface and a button bead, the first fastener surface and the slingshot cup form a female fastener, the second fastener surface and the button bead form a male fastener, and the button bead and the slingshot cup are connected in a buckling mode to achieve connection of the female fastener and the male fastener. An opening is formed in the lower end of the slingshot cup and extends inwards from the side wall of the slingshot cup to form a hemming opening, an annular groove is formed in the hemming opening, and an elastic ring is arranged in the annular groove. The button bead comprises a lower base surface and a bead head which is integrally punched and formed, the bead head comprises an outer wall and an inner wall, the lower end of the outer wall is the lower base surface, the upper end of the outer wall is an arc curved surface which transits upwards and then extends downwards to form the inner wall, the lower end of the inner wall forms an inner bottom surface, and a second connecting hole is formed in the center of the inner bottom surface. The neck position below the arc curved surface of the ball head is designed to be a concave ring portion with a 90-degree concave angle, and the concave ring portion is connected with an elastic ring in a clamping mode to achieve connection of the button ball and the slingshot cup. The purpose that the female buckle and the male buckle are easy to enter and difficult to exit is achieved through the arc curved surface of the button bead and the concave ring part with the 90-degree concave angle.

Description

Technical Field

[0001] The present disclosure relates to the technical field of snap fasteners, and in particular to a snap fastener that is easy to put in but difficult to take out. Background Art

[0002] Metal snap buttons are the most widely used in the apparel industry, used in applications such as down jackets, denim shirts, windbreakers, waterproof mountaineering (outdoor) jackets, and fabrics for baby strollers. However, some specialized garments, depending on their intended use, require buttons with a higher release force after engagement. Examples include jackets, strollers, and baby hammocks. Traditionally, if a higher release force is required, the engagement force must be increased accordingly. For example, if the release force of a male and female snap is 7 pounds, the engagement force exceeds 15 pounds. This 15-pound engagement force is clearly a significant challenge for manual fastening, especially in garment manufacturing. While a few fastenings may be acceptable, the increased number of fastenings inevitably leads to reduced physical strength, finger fatigue, and swelling and pain due to the smaller force points. Fastening efficiency also decreases significantly. Existing male snap buttons are manufactured using a stamping process. Because this process only applies force to the outer neck, it is impossible to produce right-angled snaps, regardless of the die shape used. The physical properties of a cylinder under external force determine the slope and arc of the neck turning point. This results in the neck being too smooth after the female buckle elastic ring is inserted, which lacks a strong snap action and fails to meet the required opening and closing force for a difficult release. Therefore, it is necessary to optimize and improve the existing snap fastener structure to design a snap fastener that is easy to insert and difficult to remove. Utility Model Content

[0003] In view of this, the present disclosure proposes a snap fastener that is easy to put in and difficult to take out, so as to achieve the purpose of making the male and female buckles of the snap fastener easy to fasten together and difficult to separate.

[0004] The technical solution of the present utility model is to provide a snap fastener that is easy to insert but difficult to remove, comprising a first buckle surface, a slingshot cup, a second buckle surface, and a button bead. The first buckle surface and the slingshot cup are riveted together to form a female buckle, and the second buckle surface and the button bead are riveted together to form a male buckle. The button bead and the slingshot cup are snap-fitted together to connect the female and male buckles. The first buckle surface is provided with a first assembly post, and the center of the upper end surface of the slingshot cup is provided with a first connecting hole. The first assembly post is inserted into the first connecting hole and riveted to form a reverse curling opening to connect to the slingshot cup. The lower end of the slingshot cup is open, and the opening extends inward from the side wall of the slingshot cup to form a curling opening. An annular groove is formed in the curling opening, and an elastic ring is provided in the annular groove.

[0005] The button bead includes a lower base surface and a bead head stamped integrally with the lower base surface, the bead head includes an outer wall and an inner wall, the lower end of the outer wall is the lower base surface, the upper end of the outer wall is a circular arc surface that transitions upward and then extends downward to form the inner wall, the lower end of the inner wall forms an inner bottom surface, a second connecting hole is provided in the center of the inner bottom surface, the second buckle surface is provided with a second assembly column, the second assembly column is placed in the second connecting hole and riveted to form a reverse curled mouth to achieve connection with the button bead; the neck position under the circular arc surface of the bead head is designed as a concave ring portion with a 90° concave angle, and the concave ring portion is clamped to the elastic ring to achieve connection between the button bead and the slingshot cup.

[0006] Furthermore, the edge of the first buckle surface is an inwardly curled edge, and the first assembly column sleeve is provided with an assembly meson, and the edge of the assembly meson abuts against the inside of the curled edge.

[0007] Furthermore, the second buckle surface is an annular base surface, the bottom center of the annular base surface extends upward to form a hollow cylindrical second assembly column, and the second buckle surface and the second assembly column are stamped and formed as one piece.

[0008] Furthermore, a hollow annular gap is formed between the outer wall and the inner wall of the button bead.

[0009] Furthermore, the annular base surface of the second buckle surface is formed into a curved surface structure that rises from the center to the outside through stamping.

[0010] The beneficial effects of the present invention are as follows: the main innovative design of the snap fastener designed by the present technical solution is to optimize and improve the button bead of the snap fastener component, and the arc surface is designed on the outer wall of the upper part of the bead head of the button bead through stamping and forging processes. The neck of the button bead under the arc surface is designed with a concave ring part with a 90° concave angle. When the bead head of the button bead is buckled into the slingshot cup, the elastic ring in the slingshot cup is first stretched open by the arc surface of the bead head, and the elastic ring can easily enter the concave ring part. After entering the concave ring part, since the ring bottom and the ring wall of the concave ring part are designed with a 90° concave angle, the elastic ring is tightened after entering the concave ring part, so that it is difficult to separate from the concave ring part, thereby achieving the effect that the male buckle and the female buckle are easy to buckle but difficult to separate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure decomposition of the utility model.

[0012] Figure 2 It is a cross-sectional view of the structural components of the present invention.

[0013] Figure 3 It is a partially enlarged schematic diagram of the button bead of the present invention.

[0014] Figure 4 This is a cross-sectional view of the assembly of the first button surface, slingshot cup, and clothing fabric of the utility model.

[0015] Figure 5 This is a cross-sectional view of the assembly of the second button surface, button beads, and clothing fabric of the utility model.

[0016] Figure 6 This is a cross-sectional view of the female buckle and the male buckle of the utility model in the engaged state. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are also within the scope of protection of the present disclosure.

[0018] Please refer to Figures 1 to 6 The present invention discloses a specific embodiment of a snap fastener that is easy to enter but difficult to exit. The snap fastener comprises a first buckle surface 1, a slingshot cup 2, a second buckle surface 4, and a button bead 3. The first buckle surface 1 and the slingshot cup 2 are riveted together to form a female buckle, while the second buckle surface 4 and the button bead 3 are riveted together to form a male buckle. The button bead 3 and the slingshot cup 2 are snap-fitted together to connect the female and male buckles. The first buckle surface 1 is provided with a first mounting post 102. The center of the upper end surface of the slingshot cup 2 is provided with a first connecting hole 202. The first mounting post 102 is inserted into the first connecting hole 202 and riveted to form a reversed curled opening to connect to the slingshot cup 2. The lower end of the slingshot cup 2 is open, and the opening extends inward from the side wall of the slingshot cup 2 to form a curled opening 201. An annular groove is formed within the curled opening 201, and an elastic ring 21 is disposed within the annular groove. The button bead 3 includes a lower base surface 31 and a bead head 32 stamped integrally with the lower base surface 31, and the bead head 32 includes an outer wall 321 and an inner wall 322. The lower end of the outer wall 321 is the lower base surface 31, and the upper end of the outer wall 321 is a circular arc surface 3211 that transitions upward and then extends downward to form the inner wall 322. The lower end of the inner wall 322 forms an inner bottom surface, and a second connecting hole 323 is provided at the center of the inner bottom surface. The second buckle surface 4 is provided with a second assembly column 402, and the second assembly column 402 is placed in the second connecting hole 323 and riveted to form a reverse curled mouth to achieve connection with the button bead 3; the neck position below the circular arc surface 3211 of the bead head 32 is designed as a concave ring portion 3212 with a 90° concave angle through a forging process, and the concave ring portion 3212 is clamped to the elastic ring 21 to achieve connection between the button bead 3 and the slingshot cup 2.

[0019] The upper outer wall of the bead head 32 of the button bead 3 is designed to be an arc surface by stamping and forging process, and the neck position below the arc surface is made into a concave ring portion 3212 with a 90° concave angle by forging process. When the concave ring portion 3212 is buckled and pressed into the slingshot cup 2, the elastic ring 21 in the slingshot cup 2 is first stretched open by the arc surface of the bead head 32, and the elastic ring 21 can easily enter the concave ring portion 3212. After entering the concave ring portion 3212, since the ring bottom and the ring wall of the concave ring portion 3212 are designed with a 90° concave angle ( Figure 3 As shown in FIG. 3 , the elastic ring 21 is tightened after entering the concave ring portion 3212 , effectively limiting or delaying the separation force when the male buckle and the female buckle are opened, thereby achieving the purpose of being difficult to remove.

[0020] Please refer to Figure 1 、 Figure 2 、 Figure 4 Furthermore, the edge of the first buckle surface 1 is an inwardly curled edge 101, and the first assembly post 102 is sleeved with an assembly pin 103, the edge of which abuts against the inside of the curled edge 101. The provision of the assembly pin 103 facilitates the fixation of the first assembly post 102 while maintaining the integrity of the end surface of the first buckle surface 1. The end surface of the first buckle surface 1 is exposed to the surface of the clothing, and maintaining the integrity helps to show the beauty of the snap button.

[0021] Please refer to Figure 2 、 Figure 5 、 Figure 6 Furthermore, the second buckle surface 4 comprises an annular base surface 401, with a hollow cylindrical second assembly post 402 extending upward from the center of the bottom of the annular base surface 401. The second buckle surface 4 and the second assembly post 402 are integrally stamped. This integral stamping facilitates processing and improves production efficiency. Although the bottom end face of the second buckle surface 4 has a central recessed hole, it is located on the inner bottom surface of the garment, so it does not affect the overall appearance.

[0022] Please refer to Figure 2 、 Figure 5 Preferably, a hollow annular gap is formed between the outer wall 321 and the inner wall 322 of the button bead 3. Through the hollow annular gap, on the one hand, when the second buckle surface 4 is riveted and combined, the fabric of the assembled clothing will be pressed into the hollow annular gap, which is beneficial to the stability of the installation of the male buckle. On the other hand, it is beneficial to improve the strength of this part of the arc surface.

[0023] Please refer to Figure 1 、 Figure 2 、 Figure 5 Preferably, the annular base surface 401 of the second buckle surface 4 is stamped into a curved surface structure that rises from the center to the outside. The curved surface structure design is conducive to the second buckle surface 4 being assembled with clothing fabric and riveted to the button bead, and the second buckle surface 4 can be pressed more firmly with the clothing fabric.

[0024] While various embodiments of the present disclosure have been described above, the above descriptions are illustrative, non-exhaustive, and not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A snap button that is easy to put in but difficult to take out, comprising a first buckle surface (1), a slingshot cup (2), a second buckle surface (4) and a button bead (3), wherein the first buckle surface (1) and the slingshot cup (2) are connected by riveting to form a female buckle, the second buckle surface (4) and the button bead (3) are connected by riveting to form a male buckle, and the button bead (3) and the slingshot cup (2) are connected by snap-fitting to realize the connection between the female buckle and the male buckle, characterized in that: The first buckle surface (1) is provided with a first assembly column (102), and the center of the upper end surface of the slingshot cup (2) is provided with a first connection hole (202), and the first assembly column (102) is inserted into the first connection hole (202) and connected to the slingshot cup (2) by riveting to form a reverse curling mouth; the lower end of the slingshot cup (2) is an opening, and the opening is extended inward from the side wall of the slingshot cup (2) to form a curling mouth (201), and an annular groove is formed in the curling mouth (201), and an elastic ring (21) is provided in the annular groove; The button bead (3) comprises a lower base surface (31) and a bead head (32) integrally stamped with the lower base surface (31); the bead head (32) comprises an outer wall (321) and an inner wall (322); the lower end of the outer wall (321) is the lower base surface (31); the upper end of the outer wall (321) is a circular arc surface (3211) that transitions upward and then extends downward to form the inner wall (322); the lower end of the inner wall (322) forms an inner bottom surface, and the center of the inner bottom surface is provided with a second connecting hole (321). 23), the second buckle surface (4) is provided with a second assembly column (402), the second assembly column (402) is placed in the second connecting hole (323) and is connected to the button bead (3) by riveting to form a reverse curling mouth; the neck position below the arc surface (3211) of the bead head (32) is designed as a concave ring portion (3212) with a 90° concave angle through a forging process, and the concave ring portion (3212) is clamped on the elastic ring (21) to realize the connection between the button bead (3) and the slingshot cup (2).

2. The easy-in, hard-out snap fastener according to claim 1, characterized in that: The edge of the first buckle surface (1) is an inwardly facing curled edge (101), and the first assembly column (102) is sleeved with an assembly meson (103), and the edge of the assembly meson (103) abuts against the inside of the curled edge (101).

3. The easy-in, hard-out snap fastener according to claim 1, characterized in that: The second buckle surface (4) is an annular base surface (401), the bottom center of the annular base surface (401) extends upward to form a hollow cylindrical second assembly column (402), and the second buckle surface (4) and the second assembly column (402) are integrally stamped.

4. The easy-in, hard-out snap fastener according to claim 1, characterized in that: A hollow annular gap is formed between the outer wall (321) and the inner wall (322) of the button bead (3).

5. The easy-in, hard-out snap fastener according to claim 3, characterized in that: The annular base surface (401) of the second buckle surface (4) is formed into a curved surface structure that rises from the center toward the outer edge through stamping.

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