Snap button sockets, snap button studs, and snap buttons

Abstract

To provide a socket for a snap button, a stud for a snap button, and a snap button, into which a cap can be easily fitted. [Solution] The snap button socket 2 is used for a snap button that consists of two caps each having a substantially cylindrical mating protrusion and a flange extending from the base of the mating protrusion, a socket that fits with one of the caps, and a stud that fits with the other cap. The snap button socket has an annular body 22 and a valve that protrudes from the inner surface of the annular body 22 toward the center of the annular body, and the valve is flexible in the mating direction of the mating protrusions on the caps.

Description

[Technical Field]

[0001] The present invention relates to a socket for a snap button, a stud for a snap button, and a snap button. [Background technology]

[0002] Snap buttons have traditionally been widely used on clothing and other items. Snap buttons function by fitting a male stud into a female socket. To hold the fabric of clothing or other items between the socket and stud, the fitting protrusions on the cap penetrate the fabric, and the tips of the fitting protrusions that penetrate the fabric are crimped with a special machine to engage with the cap.

[0003] In recent years, snap buttons that allow a cap to be fitted to a socket or stud without using a dedicated crimping machine have been considered. For example, Patent Document 1 discloses a structure in which a slit is provided in the fitting protrusion of the cap. The tip of the fitting protrusion constituting the cap described in the document is provided with an annular protrusion.

[0004] When this cap is fitted to a socket or stud, the tip bends diametrically due to the slits, reducing the diameter of the tip, allowing the fitting protrusion of the cap to pass through the fitting hole of the socket or stud. After the tip passes through the fitting hole, the diameter of the tip returns to its original value, allowing the socket or stud to fit over the fitting protrusion.

[0005] Patent Document 2 discloses a structure in which a slit is provided like the tip of the cap disclosed in Patent Document 1, and in addition, an annular protrusion is provided on the side of the fitting protrusion. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-192642 [Patent Document 2] Utility Model Registration No. 3238014 Summary of the Invention [Problem to be solved by the invention]

[0007] The socket and stud described in Patent Documents 1 and 2 simply have a fitting hole in the center that has approximately the same cross-sectional shape and cross-sectional diameter as the fitting protrusion of the cap. As a result, in practice, a large pressing force is required to fit the fitting protrusion of the cap that has penetrated the fabric onto the socket or stud, making it impossible for users with weak grip strength to fit them together.

[0008] As described above, these patent documents focus only on the cap side when fitting the cap, and do not fully consider the actual situation of the user. This is thought to be because the sockets and studs described in these patent documents were developed with priority given to their function as snap buttons. Furthermore, because snap buttons are highly versatile, there is a need for a method that allows users to easily fit caps to sockets and studs.

[0009] An object of the present invention is to provide a socket for a snap button, a stud for a snap button, and a snap button that can easily fit a cap. [Means for solving the problem]

[0010] As mentioned above, the sockets and studs described in Patent Documents 1 and 2 simply have a fitting hole for fitting the fitting protrusion of the cap. Furthermore, in the sockets and studs, the male and female parts are integrally formed with the annular body in consideration of the durability of these parts, and the annular body is formed thick. Therefore, when fitting the fitting protrusion of the cap to the socket or stud, the periphery of the fitting hole hardly bends, making it difficult to fit the socket or stud to the cap.

[0011] Therefore, the inventors focused on the fact that a snap button only functions after the cap, socket, and stud clamp the fabric, and studied ways to make it relatively easy to fit the cap and socket, and the cap and stud together. As a result, rather than simply providing a fitting hole for fitting the fitting protrusion of the cap, as with conventional sockets and studs, they came up with the idea of ​​providing a valve in the fitting hole for fitting the fitting protrusion, and fitting the fitting protrusion through that valve.

[0012] Furthermore, the inventors realized that the valve must be designed to be flexible when the fitting protrusion of the cap is fitted into the socket or stud, and came up with the idea of ​​configuring the valve to have an annular body with a ring-shaped valve, and to have the valve protrude from the inner surface of the annular body toward the center of the annular body. This finding that such a valve gives the valve great flexibility and allows the fitting protrusion of the cap to be easily fitted into the socket or stud led to the completion of the present invention. The present invention, which was completed based on this finding, is as follows.

[0013] (1) A socket for a snap button, used for a snap button, which is composed of two caps each having a substantially cylindrical fitting protrusion and a flange portion extending from the base of the fitting protrusion, a socket that fits with one of the caps, and a stud that fits with the other cap, Snap button sockets are The valve includes a circular annular body and a valve extending from an inner surface of the annular body toward a center of the annular body, A socket for a snap button, wherein the valve has flexibility in the fitting direction of the fitting protrusion provided on the cap.

[0014] (2) A socket for a snap button as described in (1) above, in which a groove is provided at the base of the valve.

[0015] (3) A socket for a snap button according to (1) or (2) above, in which the valve has a plurality of slits in the diameter direction of the socket.

[0016] (4) The socket for a snap button according to any one of (1) to (3) above, wherein the valve has a curved portion at the tip of the valve when the cross section of the socket is viewed.

[0017] (5) A stud for a snap button, used for a snap button, which is composed of two caps each having a substantially cylindrical fitting protrusion and a flange portion extending from the base of the fitting protrusion, a socket that fits with one cap, and a stud that fits with the other cap, Snap button studs are The valve includes a circular annular body and a valve extending from an inner surface of the annular body toward a center of the annular body, A stud for a snap button, wherein the valve has flexibility in the fitting direction of the fitting protrusion provided on the cap.

[0018] (6) A stud for a snap button as described in (5) above, in which a groove is provided at the base of the valve.

[0019] (7) A stud for a snap button according to (5) or (6) above, in which the valve has a plurality of slits in the diameter direction of the stud.

[0020] (8) The stud for a snap button according to any one of (5) to (7) above, wherein the valve has a curved portion at the tip of the valve when the cross section of the stud is viewed.

[0021] (9) A snap button comprising a socket for a snap button according to any one of (1) to (4) above and a stud for a snap button according to any one of (5) to (8) above. [Brief explanation of the drawings]

[0022] [Figure 1]Figure 1 is a schematic diagram of a snap button using caps that constitute the snap button of this embodiment, Figure 1(a) is a side view of the snap button in which two caps are fitted to a socket and a stud, respectively, and then the socket is fitted to the stud, and Figure 1(b) is a cross-sectional view taken along line AA of Figure 1(a). [Figure 2] Figure 2 shows a socket according to this embodiment, with Figure 2(a) being a bottom view, Figure 2(b) being a plan view, Figure 2(c) being a left side view, Figure 2(d) being a right side view, Figure 2(e) being a front view, Figure 2(f) being a rear view, Figure 2(g) being a bottom oblique view, Figure 2(h) being a top oblique view, Figure 2(i) being an AA cross-sectional view of Figure 2(a), and Figure 2(j) being a BB cross-sectional view of Figure 2(a). [Figure 3] Figure 3 shows a stud according to this embodiment, with Figure 3(a) being a bottom view, Figure 3(b) being a plan view, Figure 3(c) being a left side view, Figure 3(d) being a right side view, Figure 3(e) being a front view, Figure 3(f) being a rear view, Figure 3(g) being a bottom perspective view, Figure 3(h) being a top perspective view, Figure 3(i) being an AA cross-sectional view of Figure 3(a), and Figure 3(j) being a BB cross-sectional view of Figure 3(a). [Figure 4] Figure 4 shows a socket according to another embodiment, where Figure 4(a) is a bottom view, Figure 4(b) is a plan view, Figure 4(c) is a front view, Figure 4(d) is a bottom perspective view, Figure 4(e) is a top perspective view, and Figure 4(f) is a cross-sectional view taken along line AA of Figure 4(a). [Figure 5] Figure 5 shows a stud according to another embodiment, where Figure 5(a) is a bottom view, Figure 5(b) is a plan view, Figure 5(c) is a front view, Figure 5(d) is a bottom perspective view, Figure 5(h) is a top perspective view, and Figure 5(f) is a cross-sectional view taken along line AA of Figure 5(a). [Figure 6] Figure 6 is a cross-sectional view showing the state in which the cap of this embodiment is temporarily fitted to the socket and the valve of the stud, where Figure 6(a) is a cross-sectional view showing the state in which the cap is temporarily fitted to the valve of the socket, and Figure 6(b) is a cross-sectional view showing the state in which the cap is temporarily fitted to the valve of the stud. [Figure 7] FIG. 7 is a cross-sectional view of a snap button having a groove at the base of the valve that constitutes the socket and stud according to another embodiment. [Figure 8] 8A and 8B are schematic diagrams of the cap, in which FIG. 8A is a side view of the cap, and FIG. 8B is a cross-sectional view taken along the line AA in FIG. 8A. [Figure 9] FIG. 9 is an enlarged view of a vertical cross section from the tip of a fitting protrusion provided on another cap to the body portion. [Figure 10] 10 is a partial cross-sectional view showing a state in which the valve of the stud is fitted into the narrowed portion of the cap shown in FIG. [Figure 11] FIG. 11 is a partial cross-sectional view showing a state in which a valve of a stud is fitted into a narrowed portion of a cap according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments described below in detail, and each embodiment may be combined as appropriate.

[0024] 1. Overview of snap buttons Figure 1 is a schematic diagram of a snap button using caps that constitute the snap button 100 according to this embodiment, where Figure 1(a) is a side view of the snap button 100 in which two caps 1 are fitted to a socket 2 and a stud 3, respectively, and then the socket 2 is fitted to the stud 3, and Figure 1(b) is a cross-sectional view taken along line AA of Figure 1(a).

[0025] As shown in Figure 1, the snap button 100 of this embodiment is composed of two caps 1 each having a cylindrical mating protrusion 10 constituting the cap 1 and a flange portion 12 extending from the base portion 11 of the mating protrusion 10, a socket 2 that fits into one of the caps 1, and a stud 3 that fits into the other cap 1.

[0026] The mating protrusion 10 of the cap 1 penetrates a fabric (not shown), and the penetrated mating protrusion 10 is fitted into the valve 20 of the socket 2. Similarly, the mating protrusion 10 that penetrates another fabric (not shown) is fitted into the valve 30 of the stud 3. Then, the male part 31 of the stud 3 is fitted into the female part 21 of the socket 2.

[0027] 2. Sockets and studs FIG. 2 shows a socket 2 according to this embodiment, with FIG. 2(a) being a bottom view, FIG. 2(b) being a plan view, FIG. 2(c) being a left side view, FIG. 2(d) being a right side view, FIG. 2(e) being a front view, FIG. 2(f) being a rear view, FIG. 2(g) being a bottom perspective view, FIG. 2(h) being a top perspective view, FIG. 2(i) being a cross-sectional view taken along line AA of FIG. 2(a), and FIG. 2(j) being a cross-sectional view taken along line BB of FIG. 2(a). The socket 2 shown in FIG. 2 constitutes the female button of a snap button 100. A male portion 31 of a stud 3, which will be described later, is fitted into the female portion 21 of FIG. 2, and functions as the snap button 100.

[0028] The socket 2 comprises a circular annular body 22 and a valve 20 that protrudes from the inner surface of the annular body 22 toward the center of the annular body 22. As shown in FIG. 2(f), the valve 20 protrudes into the center of the annular body 22 via a female portion 21 that is integrally formed with the annular body 22. Therefore, when the fitting protrusion 10 of the cap 1 is fitted from top to bottom in FIGS. 2(e) and 2(h), the valve 20 bends and the fitting hole 23 opens slightly, allowing the fitting protrusion 10 to be easily fitted.

[0029] Furthermore, even if the cross-sectional diameter of the fitting protrusion 10 (representing D1 in FIG. 1) is larger than the diameter D2 of the fitting hole 23 (representing D2 in FIG. 2), the valve 20 bends in the fitting direction, so that the tip 13 of the fitting protrusion 10 can be fitted into the fitting hole 23. Accordingly, a restoring force acts on the valve 20, causing it to return to its original state after the fitting protrusion 10 is fitted. Therefore, this restoring force allows the valve 20 to clamp the tip 13 of the fitting protrusion 10, so that in a socket 2 equipped with the valve 20, the fitting protrusion 10 is unlikely to come off.

[0030] 2(j), a groove 25 is provided at the base of the valve 20. This groove 25 improves the flexibility of the valve 20, making it easier for the socket 2 to fit and retain the fitting protrusion 10.

[0031] As shown in Figure 2, the valve 20 protrudes from the annular body 22 of the socket 2 toward the center. Therefore, when the cap 1 is pressed against the socket 2, the fitting protrusion 10 of the cap 1 bends in the direction of the arrow, which is the fitting direction. Therefore, even if the fitting hole 23 is smaller than the diameter of the tip 13 of the fitting protrusion 10 as shown in Figure 2, the flexibility of the valve 20 allows the fitting protrusion 10, which moves in the direction in which the valve 20 opens, to fit into the fitting hole 23.

[0032] Then, when the fitting protrusion 10 enters the fitting hole 23 and the valve 20 reaches the constricted portion 14 of the cap 1, the valve 20 moves in the closing direction, thereby fitting and holding the constricted portion 14. This makes it difficult for the cap 1 to come off the socket 2. Furthermore, while in the past the cap and socket had to be engaged by crimping, in this embodiment, the flexibility of the valve 20 allows the cap 1 to be easily fitted into the fitting hole 23 of the socket 2 by hand. The same is true for the stud 3.

[0033] 2, a plurality of slits 24 may be provided in the diameter direction of the socket 2. This distributes the pressure applied to the valve 20, making it easier to open and close the valve 20. The same applies to the valves 20a, 30b, 30c, 30, 40, and 50.

[0034] Figure 3 shows a stud according to this embodiment, with Figure 3(a) being a bottom view, Figure 3(b) being a plan view, Figure 3(c) being a left side view, Figure 3(d) being a right side view, Figure 3(e) being a front view, Figure 3(f) being a rear view, Figure 3(g) being a bottom perspective view, Figure 3(h) being a top perspective view, Figure 3(i) being a cross-sectional view taken along line AA of Figure 3(a), and Figure 3(j) being a cross-sectional view taken along line BB of Figure 3(a). The stud 3 shown in Figure 3 constitutes the female button of the snap button 100.

[0035] Similar to the socket 2 shown in Fig. 2, the stud 3 shown in Fig. 3 also comprises a circular annular body 32 and a valve 30 that protrudes from the inner surface of the annular body 32 towards the centre of the annular body 32. As shown in Fig. 3(j), the valve 30 protrudes into the centre of the annular body 32 via a male part 31 that is integrally formed with the annular body 32. Furthermore, a groove 35 is also provided in Fig. 3(j), which further improves the flexibility of the valve 30.

[0036] FIG. 4 illustrates a socket 4 according to another embodiment, with FIG. 4(a) being a bottom view, FIG. 4(b) being a plan view, FIG. 4(c) being a front view, FIG. 4(d) being a bottom perspective view, FIG. 4(e) being a top perspective view, and FIG. 4(f) being a cross-sectional view taken along line AA of FIG. 4(a). FIG. 5 illustrates a stud according to another embodiment, with FIG. 5(a) being a bottom view, FIG. 5(b) being a plan view, FIG. 5(c) being a front view, FIG. 5(d) being a bottom perspective view, FIG. 5(h) being a top perspective view, and FIG. 5(f) being a cross-sectional view taken along line AA of FIG. 5(a). The back view, left side view, and right side view of FIG. 4 are identical to the front view of FIG. 4(c), and therefore are omitted here. Similarly, the back view, left side view, and right side view of FIG. 5 are identical to the front view of FIG. 5(c), and therefore are omitted here.

[0037] Like the socket 2 shown in FIG. 2, the socket 4 shown in FIG. 4 also includes an annular body 42 and a valve 40 that protrudes from the inner surface of the annular body 42 toward the center of the annular body 42. The female part 41 shown in FIGS. 4(a), 4(d), and 4(f) may be any annular elastic body, such as an annular spring. As shown in FIGS. 4(a) and 4(d), the female part 41 has a slit 41a. When the male part 51 of the stud 5 shown in FIG. 5 is mated with the female part 41 of FIG. 4, the slit 41a in the female part 41 opens, and the elastic force of the female part 41 allows the male part 51 to be mated with the female part 41.

[0038] As shown in Figure 4(f), like the valve 20 shown in Figure 2, the socket 4 also includes a circular annular body 42 and a valve 40 that protrudes from the inner surface of the annular body 42 toward the center of the annular body 42. The valve 40 shown in Figure 4(f) is plate-shaped and inclined in the fitting direction of the cap, which is from top to bottom in Figure 4(f). This is to allow the fitting protrusion of the cap to be temporarily fitted. Details will be described later.

[0039] As shown in Figure 5(f), like the valve 40 shown in Figure 4, the stud 5 also comprises a circular annular body 52 and a valve 50 that protrudes from the inner surface of the annular body 52 towards the center of the annular body 52. ​​The valve 40 shown in Figure 5(f) is also plate-shaped and inclined in the cap fitting direction from bottom to top in Figure 5(f).

[0040] 6A and 6B are cross-sectional views showing the state in which the cap 1 is temporarily fitted to the valve 20 and valve 30 of the socket 2 and the stud 3, respectively, with FIG. 6A being a cross-sectional view showing the state in which the cap 1 is temporarily fitted to the valve 20 of the socket 2, and FIG. 6B being a cross-sectional view showing the state in which the cap 1 is temporarily fitted to the valve 30 of the stud 3. In this embodiment, the fitting direction indicates the direction of the arrows in FIGS. 6A and 6B. The fitting protrusion 10 of the cap 1 shown in FIG. 6 is the cap 1 shown in FIG. 1, and for the sake of explanation, only the tip portion 13 and the constricted portion 14 are shown in FIG. 6.

[0041] 7 is a cross-sectional view of a snap button 200 according to another embodiment, in which grooves 25b and 35b are provided at the bases of valves 20b and 30b of socket 2b and stud 3b, respectively. As shown in FIG. 7, providing a large, deep groove 25b at the base of valve 20b further improves the flexibility of valve 20b, making it easier to open and close and to fit cap 1. The depth of groove 25b need only be approximately the same as the thickness of valve 20b. This also applies to valves 30, 40, and 50.

[0042] Furthermore, as shown in FIG. 6, when viewing the cross section of the stud 3, the tip of the valve 30 may be provided with a curved portion 36 that curves from the side where the fitting protrusion 10 of the cap 1 is fitted toward the side edge of the valve 20. The curved portion 36 may be curved so as to jut out toward the center of the fitting hole 33, as shown in FIG. 6(b), or conversely, it may be curved so as to jut outward from the center of the fitting hole 33. By providing this curved portion, as shown in FIG. 6, the tip 13 of the fitting protrusion 10 of the cap 1 is provisionally fitted into the valve 30. This makes it possible to position the cap 1 when fitting it to the stud 3, and allows for stable pressing of the cap 1. The same applies to the socket 2.

[0043] As shown in Fig. 5(f), when the valve 50 is plate-shaped, the tip may be inclined toward the fitting direction, as described above. This allows the valve 50 to function as a temporary fitting for the cap. The tip of the valve 50 may also be curved, similar to the valve 30 shown in Fig. 6. The same applies to the valve 40 shown in Fig. 4(f).

[0044] 3. Cap 8A and 8B are schematic diagrams of the cap 1, in which FIG. 8A is a side view of the cap 1 and FIG. 8B is a cross-sectional view taken along the line AA in FIG. 8A.

[0045] The cap 1 may be a cap 1 that fits onto the socket 2 and / or stud 3 of the snap button 100. The cap 1 may include a substantially cylindrical fitting protrusion 10, a flange portion 12 connected to a base portion 11 of the fitting protrusion 10, and a constricted portion 14 that is an annular recess provided on the outer periphery of the fitting protrusion 10 near a tip portion 13 of the fitting protrusion 10. In this embodiment, the flange portion 12 side of the fitting protrusion 10 is referred to as the base portion 11. The flange portion 12 is provided with a non-slip material 18 (not shown). The same applies to the socket 2 and stud 3 described in detail below.

[0046] As shown in FIG. 8 , the fitting protrusion 10 may be substantially cylindrical, with a constricted portion 14 provided near the tip portion 13. In other words, the fitting protrusion 10 may have the tip portion 13 and the body portion 15 connected via the constricted portion 14. The length L of the tip portion 13 may be such that, when the socket 2 to which the cap 1 is fitted and the stud 3 to which the cap 1 is fitted are fitted, the tips 16 of the fitting protrusions 10 provided on each cap 1 do not come into contact with each other, as shown in FIG. 8( b). Alternatively, the length L of the tip portion 13 may be such that, when the stud 3 is fitted into the socket 2, the tips 16 just come into contact with each other. In this embodiment, the term "near the tip portion" refers to the length from the tip 16 to the constricted portion 14. In other words, the term "near the tip portion" refers to the length of the tip portion 13.

[0047] The fitting protrusion 10 may also have a hollow center. However, from the viewpoint of the strength of the fitting protrusion 10, it is preferable that there is no hollow. It is preferable that the tip 16, which is the surface of the tip portion 13 constituting the fitting protrusion 10, does not have a slit. This is to prevent loose threads in the fabric from getting caught in the slit when the fitting protrusion 10 penetrates the fabric.

[0048] The snap button 100 functions when the male stud 3 is fitted into the female socket 2, but if the tip 16 of the fitting protrusion 10 of the cap 1 abuts against the socket 2 before the stud 3 is fitted into the socket 2, the stud 3 cannot be fitted into the socket 2. For this reason, as shown in Figure 1(b), the length L of the tip 13 of the fitting protrusion 10 may be long enough so that the tips 16 of the caps 1 do not abut against each other even after the stud 3 is fitted into the socket 2.

[0049] On the other hand, if the length L of the tip portion 13 is too short or if the tip portion 13 does not exist at all, the fitting retention force will be low even after the cap 1 is fitted to the socket 2 or the stud 3, and there is a concern that the cap 1 may come off the socket 2 or the stud 3. For this reason, the length L of the tip portion 13 may be approximately 1 / 10 to 1 / 5 of the length of the fitting protrusion 10.

[0050] 9 is an enlarged view of a vertical cross section of a fitting protrusion 10a of another cap 1a, from the tip 13a to the body 15a. As shown in FIG. 9, in the vertical cross section of the fitting protrusion 10a, the curvature of the neck 14a may gradually decrease from the tip 13a toward the base. The greater the curvature, the stronger the fitting retention force, making it more difficult for the cap 1a to come off the socket 2 or the stud 3.

[0051] 8, in a longitudinal cross section of the fitting protrusion 10, the tip 13 side of the constricted portion 14 may be provided with a surface 17 that is approximately parallel to the diameter direction of the fitting protrusion 10. If the surface 17 is approximately parallel to the diameter direction, the fitting retention force of the socket 2 and the stud 3 is further increased. The surface 17 is annular, just like the constricted portion 14.

[0052] In this embodiment, the diameter direction is the direction of the arrow shown in Fig. 8(b). The surface portion 17 may be slightly inclined from the diameter direction. If an inclination above the arrow in Fig. 8(b) is defined as + and an inclination below the arrow is defined as -, the surface portion 17 may be inclined, for example, at about -5° to 5°. If the inclination is 0 to -5°, the cap 1 will not easily come off the socket 2 or the stud 3, but if the cap is manufactured by injection molding, an inclination of 0 to 5° is preferable in view of ease of manufacture. An inclination of 0°, which is parallel to the direction of the arrow, may also be used.

[0053] The cross-sectional shape of tip 13 may be circular or polygonal. As will be described later, when fitting cap 1 to socket 2 or stud 3, if one side is circular and the other is polygonal, even if a frayed thread gets caught, the different shapes allow the frayed thread to move into the gap. Therefore, even if a frayed thread gets caught, cap 1 can be fitted to socket 2 or stud 3 without applying a large pressing force.

[0054] When the tip 13 is polygonal, it may be, for example, triangular, hexagonal, octagonal, or octagonal. The corners of the polygon may be rounded. Each side of the polygon may be rounded from the center of the polygon to the outside. When the corners or sides are rounded, the socket or stud can be fitted with the cap 1 at a surface, making it even more difficult for the cap 1 to come off the socket or stud.

[0055] In this embodiment, the constricted portion 14 is an annular recess provided on the outer periphery of the fitting protrusion 10. That is, the diameter of the constricted portion 14 is smaller than the diameter D1 of the tip portion 13 and the diameter D1 of the body portion 15.

[0056] The shape of the constricted portion 14 may be, for example, as shown in Fig. 8, a shape including a surface portion 17, with the diameter gradually decreasing from the surface portion 17 toward the body portion 15. Alternatively, the shape may be, for example, as shown in Fig. 9, a shape in which the curvature gradually decreases from the tip portion 13 toward the base portion in a longitudinal cross section, as shown in Fig. 9, a shape including a surface portion 17d, with the curvature gradually decreasing from the surface portion 17d toward the body portion 15d, as shown in Fig. 9, a shape in which the curvature gradually decreases ....

[0057] Fig. 10 is a partial cross-sectional view showing the state in which valve 30b of stud 3c is fitted into constricted portion 14a of cap 1a shown in Fig. 9. Fig. 11 is a partial cross-sectional view showing the state in which valve 30d of stud 3d is fitted into constricted portion 14c of cap 1d according to another embodiment. As shown in Figs. 10 and 11, when viewed in cross section of stud 3c and stud 3d, valves 30c and 30d may have shapes corresponding to the shapes of constricted portions 14c and 14d to body portions 15c and 15d in the longitudinal cross sections of caps 1c and 1d. In other words, when viewed in cross section, valves 30c and 30d may have shapes corresponding to the shapes of constricted portions 14c and 14d, respectively.

[0058] 9 to be fitted to the stud 3, a convex portion having the same curvature as the constricted portion 14a of the fitting protrusion 10a may be formed. Also, as shown in FIG. 11, if the constricted portion 14d has a surface portion 17d, a convex portion having a similar surface portion may be formed.

[0059] In this configuration, the constricted portion 14d of the fitting protrusion 10d is fitted to the valve 30d at a surface, thereby further improving the fitting retention force. Furthermore, if the valve 30d has a shape that corresponds to the shape of the fitting protrusion 10d from the constricted portion 14d to the body portion 15d of the fitting protrusion 10d, an even more stable fitting retention force can be achieved.

[0060] The snap button socket, snap button stud, cap, and snap button according to the present embodiment can be made of plastic, brass, phosphor bronze, zinc, stainless steel, etc. These can be manufactured in the same manner as conventional methods, with plastic being manufactured by injection molding, zinc being manufactured by casting, and other metals being manufactured by pressing. [Explanation of symbols]

[0061] 1,1a,1b Cap 10 Mating protrusion 11,11a Constriction 12 Tip 13 Torso 14 (of the mating projection) tip 15 Flange 16 (Fabric) Anti-slip 17 (Parallel to the diameter of the mating protrusion) 2 sockets 20 valves 21 Female part 22 (Socket) Annular body 23 Fitting hole 24 Slit 25 Groove 36 Curved section 3 studs 31 Male 32 (Stud) Annular body 33 Fitting hole 34 Slit 35 Groove 4 sockets 41 Female part 42 (Socket) Annular body 43 Fitting hole 44 Slit 5 studs 51 Male 52 (Stud) Annular body 53 Fitting hole 54 Slit D1 Tip diameter D2 Body diameter L Length of tip 100,200 snap button

Claims

1. A snap button socket for use with a snap button comprising two caps each having a substantially cylindrical fitting protrusion and a flange portion extending from the base of the fitting protrusion, a socket that fits with one of the caps, and a stud that fits with the other cap, The snap button socket is The valve includes a circular annular body and a valve extending from an inner surface of the annular body toward a center of the annular body, A socket for a snap button, wherein the valve has flexibility in the fitting direction of the fitting protrusion provided on the cap.

2. 2. The snap button socket according to claim 1, wherein a groove is provided at the base of said valve.

3. 3. The snap button socket according to claim 1, wherein said valve is provided with a plurality of slits in a diameter direction of said socket.

4. 4. The socket for a snap button according to claim 1, wherein, when the cross section of the socket is viewed, the valve has a curved portion at a tip of the valve.

5. A snap button stud is used for a snap button that is composed of two caps each having a substantially cylindrical fitting protrusion and a flange portion extending from the base of the fitting protrusion, a socket that fits with one of the caps, and a stud that fits with the other cap, The snap button stud is The valve includes a circular annular body and a valve extending from an inner surface of the annular body toward a center of the annular body, A stud for a snap button, wherein the valve has flexibility in a fitting direction of the fitting protrusion provided on the cap.

6. 6. The stud for a snap button according to claim 5, wherein a groove is provided at the base of said valve.

7. 7. The stud for a snap button according to claim 5, wherein the valve is provided with a plurality of slits in the diameter direction of the stud.

8. The stud for a snap button according to any one of claims 5 to 7, wherein when the stud is viewed in cross section, the valve has a curved portion at a tip of the valve.

9. A snap button comprising the snap button socket according to any one of claims 1 to 4 and the snap button stud according to any one of claims 5 to 8.

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