Shoes with non-slip soles

Abstract

The present invention provides shoes with anti-slip fasteners that allow for the formation of the sole by injection molding while ensuring the fixing strength of the anti-slip fasteners. [Solution] A shoe equipped with a non-slip metal fitting on the sole, comprising: a non-slip metal fitting; a base member made of a rubber material to which the non-slip metal fitting is fixed; and a sole that is fixed to the upper portion of the shoe by injection molding of molten resin material onto the bottom portion of the upper portion of the shoe, the sole encasing the base member with the resin material and fixing the base member to the bottom portion of the upper portion.

Description

Technical Field

[0004] , , ,

[0005] , ,

[0001] The present invention relates to shoes with anti-slip fittings.

Background Art

[0002] Conventionally, shoes for business use and the like are very slippery when walking on snowy roads. To prevent slipping, shoes with anti-slip fittings attached to the heel part are known. Such shoes are often formed in a boot shape using an upper made of waterproof artificial leather or the like. As shown in FIG. 6, a folding anti-slip fitting 202 is attached to the back side of the heel part 200a of the shoe sole 200.

[0003] As shown in FIG. 6(a), this anti-slip fitting 202 is tilted in the direction of arrow E around the rotation axis 202d so that the spike-like part 202a hits the ground, thereby exerting an anti-slip effect. Also, as shown in FIG. 6(b), by tilting it in the direction of arrow F, the spike-like part 202a faces the direction of the shoe sole 200 and is stored so as not to hit the ground when walking on a normal road that is not a snowy road.

[0004] When manufacturing such shoes, a method called the cement method has been known as a conventionally used manufacturing method. In this method, the heel part 200a of the molded product formed as the shoe sole 200 is sandwiched between the anti-slip fitting body 202b and the backing fitting from the bottom surface of the heel and the opposite surface, and they are fixed with caulking pins 202c or the like. By doing so, the anti-slip fitting body 202b is firmly fixed to the heel part 200a of the shoe sole 200. Then, the shoe sole 200 to which the anti-slip fitting 202 is fixed is adhered to the bottom of the upper part of the shoe with the periphery of the upper suspended in the midsole, so that the upper part and the shoe sole 200 are integrated.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, this cementing method has the problem that it is difficult to manufacture at a low cost because the process of bonding the sole 200 to the bottom of the shoe body is time-consuming.

[0007] On the other hand, there is a known manufacturing method called injection molding, in which a mold is attached to the bottom of the shoe and the upper and sole are integrated by injection molding. For example, Patent Document 1 discloses a technology for molding shoe soles by injection molding. Compared to the cement method, the injection molding method reduces the number of steps required to fix the sole to the upper, making it possible to dramatically reduce the manufacturing cost of shoes.

[0008] Therefore, if shoes with the aforementioned anti-slip metal fittings can also be manufactured using the injection molding method, they can be produced at a low cost.

[0009] However, this was previously considered impossible. When molding shoe soles using the injection molding method, the material is usually molten resin such as polyurethane, making it difficult to precisely temporarily fix the anti-slip metal fittings in place within the sole mold before injection molding. The anti-slip metal fittings temporarily fixed within the sole mold will shift position during injection molding. Even a slight misalignment will manifest as a tilt of the metal fittings on the sole surface, resulting in a defective product. Furthermore, this method makes it difficult to ensure the necessary fixing strength for the anti-slip metal fittings, and there is a risk that the anti-slip metal fittings may detach from the sole during shoe use.

[0010] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a shoe with anti-slip fittings that can ensure the fixing strength of the anti-slip fittings while molding the sole of the shoe by injection molding. [Means for solving the problem]

[0011] The shoe with anti-slip fittings according to the present invention is a shoe equipped with anti-slip fittings on the sole, and is characterized by comprising: anti-slip fittings; a base member made of a rubber material to which the anti-slip fittings are fixed; and a sole that is fixed to the upper portion of the shoe by injection molding of molten resin material onto the bottom portion of the upper portion of the shoe, the sole encasing the base member with the resin material and fixing the base member to the bottom portion of the upper portion. [Effects of the Invention]

[0012] According to the present invention, it is possible to ensure the fixing strength of the anti-slip metal fittings while molding the sole of the shoe by injection molding. [Brief explanation of the drawing]

[0013] [Figure 1] A view of a shoe with anti-slip fittings according to one embodiment of the present invention, as seen from the sole. [Figure 2] Figure 1 is a perspective view showing the metal base to which the anti-slip fittings are attached. [Figure 3] A plan view showing the shape of the metal base that is fixed to the heel portion of the sole of the shoe. [Figure 4] A partial cross-sectional view showing the upper part of the shoe and the metal base set in the mold. [Figure 5] A view of the metal fitting base from the direction of arrow C in Figure 3(b). [Figure 6] A diagram showing a conventional example. [Modes for carrying out the invention]

[0014] One embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0015] Figure 1 is a view of a shoe 10 with an anti-slip fitting according to one embodiment of the present invention, as seen from the bottom of the shoe. Figure 2 is a perspective view showing the fitting base to which the anti-slip fitting in Figure 1 is attached.

[0016] In FIGS. 1 and 2, an anti-slip fitting 16 is fixed to the heel portion 14 of the sole 12 of the shoe 10. The anti-slip fitting 16 is fixed to the heel portion 14 in a state of being attached to a fitting base (base member) 22 made of a rubber material. Although details will be described later, the fitting base 22 is integrally fixed to the upper covering portion by injection molding the sole 12 and the heel portion 14 with respect to the bottom of the upper covering portion of the shoe 10, together with the sole 12 including the heel portion 14.

[0017] The anti-slip fitting 16 is attached to a plate-shaped fitting body 18 such that a spike fitting 20 can rotate around a rotation axis 21 parallel to the sole in the directions of arrow A in FIG. 2(a) and arrow B in FIG. 2(b). The spike fitting 20 is stably held at a position tilted in the direction of arrow A and a position tilted in the direction of arrow B by the biasing force of a leaf spring portion 18a integrally formed with the fitting body 18. Further, the spike fitting 20 can be manually tilted freely in the directions of arrow A and arrow B by the user against the force of the leaf spring portion 18a.

[0018] Although details will be described later, in order to improve the operability when tilting the anti-slip fitting 16 from the state tilted in the direction of arrow A to the direction of arrow B, a space 22b of about 10 mm or more, which allows one index finger to enter, is formed between the rear end portion of the anti-slip fitting 16 of the fitting base 22 and the rear portion 22a of the fitting base 22.

[0019] By tilting the spike fitting 20 in the direction of arrow A, the spike-shaped portion 20a comes into contact with the ground, and an anti-slip effect is exhibited when walking on a snowy path. Also, by tilting the spike fitting 20 in the direction of arrow B, the spike-shaped portion faces the surface of the sole 12, and when walking on a normal road that is not a snowy path, the spike portion is housed in the heel portion 14 (fitting base 22) so as not to contact the ground.

[0020] FIG. 3 is a plan view showing the shape of the fitting base 22 fixed to the heel portion 14 of the shoe sole 12. FIG. 3(a) is a view of the fitting base 22 seen from the bottom surface of the same shoe as FIGS. 1 and 2, and FIG. 3(b) is a view of the fitting base 22 seen from the back surface of FIG. 3(a).

[0021] As shown in FIGS. 2 and 3, the anti-slip fitting 16 is fixed to the fitting base 22 made of a rubber material. More specifically, the fitting body 18 of the anti-slip fitting 16 is disposed on the surface of the surface 22c of the fitting base 22 facing the ground, and the backing fitting 24 is disposed on the surface of the surface 22d of the fitting base 22 facing the shoe sole 12, and the fitting base 22 is sandwiched between these members. In that state, the fitting body 18 and the backing fitting 24 are fixed (connected) using caulking pins 26 penetrating the fitting base 22. Thereby, the anti-slip fitting 16 is firmly fixed to the fitting base 22.

[0022] FIG. 4 is a partial cross-sectional view along the line G-G of FIG. 1 showing a state where the upper portion 11 of the shoe 10 and the fitting base 22 are set in a mold.

[0023] In this embodiment, the fitting base 22 to which the anti-slip fitting 16 is fixed is set in the mold 100 as shown in FIG. 4, and a resin (resin material) 104 such as molten polyurethane is injected into the cavity 102 around the fitting base 22 to mold the shoe sole 12 including the heel portion 14. Thereby, the injected resin 104 is solidified and the molded shoe sole 12 and the upper portion 11 of the shoe 10 in a state where the upper portion 11 is hooked around the periphery of the heel 14 on the midsole 13 are integrated, and the fitting base 22 covered with the resin 104 is integrally fixed to the upper portion 11.

[0024] Thus, in this embodiment, instead of temporarily fixing the metal body 18 of the anti-slip fitting 16 to a mold and insert molding it into a resin 104 such as polyurethane, the metal body 18 of the anti-slip fitting 16 is first firmly fixed to a metal base 22 made of rubber material in the same manner as in the conventional method. Then, the sole 12 is formed by injection molding of the molten resin 104 and integrated with the upper part 11, and at the same time, the metal base 22 is fixed to the upper part 11 with the resin 104. As a result, the fixing strength of the anti-slip fitting 16 is ensured by the strength of the metal base 22, and the metal base 22 and the sole 12 are firmly molded together with the upper part 11.

[0025] Figure 5 shows the metal fitting base 22 as viewed from the direction of arrow C in Figure 3(b).

[0026] In this embodiment, the metal fitting base 22 is made of rubber material and is formed in a plate shape having a non-slip shaped portion 22j that forms the contact surface of the heel portion 14. As shown in Figure 4, three through holes 22k are formed in the center of the metal fitting base 22 for inserting crimping pins 26 that fix the non-slip fitting 16. Furthermore, the metal fitting base 22 integrally has the non-slip shaped portion 22j, and as shown in Figure 4, it can be directly set in the mold 100 by attaching the non-slip shaped portion 22j to the recess 100a of the mold 100. Therefore, there is no need to take measures to temporarily fix the metal fitting base 22 to the mold 100 prior to injection molding.

[0027] A flange-shaped portion 22e is formed around the metal fitting base 22, and this portion is covered and secured with injection-molded resin 104, thereby increasing the fixing strength of the metal fitting base 22 to the upper portion 11.

[0028] Furthermore, on the front side of the metal base 22 of the shoe 10, a U-shaped flange portion 22f is formed, with a step in the thickness direction of the metal base 22 relative to the flange portion 22e. By covering this portion with injection-molded resin 104, the fixing strength of the metal base 22 to the upper portion 11 is further increased. In addition, the U-shaped flange portion 22f is formed continuously with the flange portion 22e without any break (forming a part of the flange portion), and the flange portion 22e and the flange portion 22f together surround the metal base 22 without any break.

[0029] In this way, by forming flange-shaped portions 22e and 22f around the entire circumference of the metal fitting base 22 and covering them with resin 104, the fixing of the metal fitting base 22 to the upper portion 11 can be made extremely strong.

[0030] Furthermore, multiple elongated holes 22h are formed in the flange-shaped portions 22e and 22f at approximately equal intervals, including at the corners of the flange-shaped portion 22e and the U-shaped flange portion 22f. When the resin 104 injected into the mold cavity 102 enters these elongated holes 22h, the bonding strength between the molded sole 12 and the metal base 22 is improved.

[0031] Furthermore, in this embodiment, the metal fitting base 22 is formed to have a thickness of 10 mm or more. This increases the bending strength of the metal fitting base 22, reducing the possibility that the flange-shaped portion 22e will detach from the sole 12 (including the heel portion 14) made of resin 104 due to the bending of the metal fitting base 22, and further increasing the fixing strength to the upper portion 11.

[0032] Next, with reference to Figures 3(b) and 4, the backing bracket 24 for fixing the anti-slip bracket 16 to the bracket base 22 will be described.

[0033] As shown in Figures 3(b) and 4, the backing metal fitting 24 has three holes for inserting the crimping pins 26. The backing metal fitting 24 also has an opening 24b in its central part.

[0034] If this opening 24b is not formed, when the resin 104 injected into the mold 100 in Figure 4 flows between the metal base 22 and the bottom of the upper portion 11, the resin 104 will not bond with the metal backing metal 24. In contrast, in this embodiment, because the opening 24b is formed in the center of the backing metal 24, the resin 104 that flows between the metal base 22 and the bottom of the upper portion 11 comes into contact with the rubber material of the metal base 22 through the opening 24b, and the molten resin 104 and the rubber material of the metal base 22 fuse together. Therefore, the bonding strength between the metal base 22 and the upper portion 11 can be further increased.

[0035] Furthermore, the larger the opening 24b, the stronger the force with which the metal base 22 is fixed to the bottom of the upper portion 11, so it is desirable to make it as large as possible. For this reason, considering the balance of the size of the anti-slip metal fitting 16 with respect to the heel portion 14, it is preferable that the size (area) of the opening 24b of the backing metal fitting 24 be larger than the area of ​​a circle with a diameter of, for example, 10 mm.

[0036] Furthermore, as shown in Figures 3(b) and 4, the metal base 22 has a roughly triangular convex portion 22i formed at a position corresponding to the opening 24b of the backing metal 24. When this convex portion 22i fits into the opening 24b of the backing metal 24, the backing metal 24 is positioned on the metal base 22, and the convex portion 22i is made more likely to come into contact with the resin 104 injected into the cavity 102, thereby improving the bonding strength between the molded sole 12 and the metal base 22.

[0037] Thus, in this embodiment, an opening 24b is formed in the central part of the backing metal fitting 24 of the anti-slip fitting 16, and a convex shape 22i is formed at a position corresponding to the opening 24b of the fitting base 22, thereby increasing the bonding strength between the fitting base 22 and the upper part 11.

[0038] Furthermore, as shown in Figures 1 and 2, a space 22b is formed between the rear end of the anti-slip fitting 16 of the metal fitting base 22 and the rear part 22a of the metal fitting base 22, which is large enough for one index finger to fit in, for example, a space of about 10 mm or more. In addition, a recess 22g with a depth of about 2 to 3 mm is formed in the metal fitting base 22 corresponding to this space 22b. In this way, the formation of the space 22b and the recess 22g between the rear end of the anti-slip fitting 16 and the rear part 22a of the metal fitting base 22 makes it easier for the user's finger to catch on the spike fitting 20 when attempting to rotate the spike fitting 20 of the anti-slip fitting 16 in the direction of arrow B, thereby improving the operability when rotating the spike fitting 20.

[0039] As described above, according to this embodiment, when injection molding the sole, instead of temporarily fixing the metal body of the anti-slip fitting to the sole mold and insert molding it, the metal body of the anti-slip fitting is first firmly fixed to a metal base made of rubber material in the same manner as in the conventional method. Then, by injection molding the molten resin, the sole is molded and integrated with the upper part, and at the same time, the metal base is integrally fixed to the upper part with the molded resin. As a result, the fixing strength of the anti-slip fitting is ensured by the strength of the metal base, and the metal base and the sole are firmly molded together with the upper part.

[0040] This allows for injection molding of the sole while ensuring the fixing strength of the anti-slip metal fittings, making it possible to significantly reduce shoe manufacturing costs.

[0041] Furthermore, since a flange-shaped portion is formed without any breaks around the entire circumference of the metal fitting base 22, including the U-shaped flange portion on the front side of the shoe, the strength with which the metal fitting base is fixed to the upper portion can be increased by covering this portion with injection-molded resin. In addition, since multiple holes into which molten resin enters are formed throughout the flange-shaped portion, the strength with which the metal fitting base is fixed to the upper portion can be increased.

[0042] Furthermore, by creating a space of, for example, 10 mm or more between the rear end of the anti-slip fitting and the rear part of the fitting base, it becomes possible to improve the operability when a user attempts to rotate the spike fitting of the anti-slip fitting in the direction of arrow B in Figure 2.

[0043] Furthermore, having a metal base with a thickness of 10 mm or more increases the bending strength of the metal base, reducing the possibility of it detaching from the sole (especially the heel area) and increasing the fixing strength to the upper part. [Explanation of symbols]

[0044] 10: Shoe, 11: Upper part, 12: Sole, 14: Heel part, 16: Anti-slip metal fitting, 22: Metal fitting base, 24: Backing metal fitting, 100: Mold, 102: Cavity

Claims

1. Shoes equipped with anti-slip metal fittings on the soles, Anti-slip metal fittings, A base member made of rubber material to which the aforementioned anti-slip fittings are fixed, A sole that is fixed to the upper portion of a shoe by injection molding molten resin material onto the bottom portion of the upper portion, wherein the resin material encases the base member and fixes the base member to the bottom portion of the upper portion, Shoes equipped with anti-slip metal fittings, characterized by having these features.

2. The shoe with an anti-slip fitting according to claim 1, further comprising a backing fitting arranged to sandwich the base member with respect to the anti-slip fitting, wherein the backing fitting is connected to the anti-slip fitting by penetrating the base member, thereby fixing the anti-slip fitting to the base member, and an opening is formed in the center of the backing fitting to allow the base member and the molten resin material to come into contact.

3. The shoe with anti-slip fittings according to claim 2, characterized in that the area of ​​the opening is larger than the area of ​​a circle with a diameter of 10 mm.

4. The shoe with anti-slip fittings according to claim 2, characterized in that a convex shape is formed on the base member at a position corresponding to the opening of the backing fitting, which enters the opening.

5. The shoe with anti-slip fittings according to claim 1, characterized in that a flange-shaped portion that engages with the sole of the shoe is formed seamlessly around the entire circumference of the base member.

6. The shoe with anti-slip fittings according to claim 5, characterized in that a U-shaped flange portion is formed on the front side of the base member, forming a part of the flange-shaped portion.

7. The shoe with anti-slip hardware according to claim 5, characterized in that a plurality of holes into which the molten resin material enters are formed throughout the entire flange-shaped portion.

8. The shoe with anti-slip fittings according to claim 1, characterized in that the base member is formed to have a thickness of 10 mm or more.

9. The shoe with the anti-slip fitting according to claim 1, characterized in that a space of 10 mm or more is formed between the rear end of the anti-slip fitting and the rear part of the base member.

10. The shoe with anti-slip fittings according to claim 1, characterized in that the base member has an anti-slip shape integrally formed thereon, and the base member can be directly set into the mold by attaching the anti-slip shape to the mold for injection molding.

11. A method for manufacturing shoes equipped with anti-slip metal fittings on the soles, A method for manufacturing a shoe with anti-slip fittings, characterized by placing a base member made of rubber material to which the anti-slip fittings are fixed into a mold for molding the sole of the shoe, integrally molding the sole of the shoe onto the upper portion by injection molding molten resin material onto the bottom portion of the upper portion of the shoe, and enclosing the base member with the resin material to fix the base member to the bottom portion of the upper portion.

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