Studs on outsoles, outsoles for cleated shoes, method for manufacturing outsoles, and cleated shoes

Abstract

To restrain separation of a stud from an outsole, and firmly keep the stud.SOLUTION: A stud 10 of an outsole 1 comprises a cylindrical outer cylinder part 11 provided on an outsole body 2, and a core part 12 provided inside the outer cylinder part 11. The outer cylinder part 11 is seamlessly formed integrally with the outsole body 2. The outer cylinder part 11 is constituted in such a manner that an inner wall surface of the outer cylinder part 11 surrounds a side surface of the core part 12 and the inner wall surface is in contact with the side surface of the core part 12.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to studs for outsoles, outsoles for cleated shoes, methods of manufacturing outsoles, and cleated shoes. [Background technology]

[0002] BACKGROUND ART Conventionally, studs for outsoles used in cleat shoes have been known, for example, as disclosed in Patent Document 1.

[0003] In Patent Document 1, a plurality of studs (first studs and second studs) are provided on an outsole (first outsole portion) for a cleated shoe. Each of the plurality of studs is configured as a separate member made of a different material from the outsole. Each stud is joined to the underside of the outsole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-113314 Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration disclosed in Patent Document 1, a seam is visible at the joint between the stud and the outsole (see, for example, Figures 1 and 9 of Patent Document 1). In other words, in this configuration, the stud and the outsole are not continuous. Therefore, when a person wearing cleated shoes (hereinafter referred to as the "wearer") performs various athletic movements during athletic competition (e.g., walking, running, kicking a ball, making sudden stops, turning, jumping, landing, etc.), the seam can become the starting point for the stud to separate from the outsole. Furthermore, if the joint at the seam becomes unstable due to the continuous load, it can become difficult to secure the stud to the outsole. For these reasons, improvements have been desired for conventional studs that prevent the studs from separating from the outsole and maintain the studs' strength.

[0006] The present disclosure has been made in view of these points, and its purpose is to prevent the studs from peeling off from the outsole while maintaining the strength of the studs. [Means for solving the problem]

[0007] To achieve the above object, the first disclosure relates to a stud for an outsole used in a cleat shoe, the stud comprising a cylindrical outer tube portion provided on the outsole and a core portion provided inside the outer tube portion. The outer tube portion is formed seamlessly and integrally with the outsole. The outer tube portion is configured such that the inner wall surface of the outer tube portion surrounds the side surface of the core portion and the inner wall surface is in contact with the side surface of the core portion. The core is provided with a retaining structure to prevent the core from slipping out of the outer tube. The retaining structure is angularly formed at a vertical midpoint of the core, and includes a corner spaced downward from the upper end of the core. The radial size of the core is greatest at the corner. The radial size of the core gradually decreases from the corner upward and downward.

[0008] In the first disclosure, the outer tube portion is seamlessly formed as a single piece with the outsole. That is, in the stud according to the first disclosure, the outer tube portion is formed continuously with the outsole. Therefore, even if continuous loads are applied to the stud due to various athletic movements by the wearer of the cleated shoes during athletic activities, there is no visible seam on the outside that could be the starting point for the outer tube portion to separate from the outsole, thereby preventing the stud from separating from the outsole. Furthermore, in the first disclosure, the outer tube portion is configured so that its inner wall surface surrounds the side of the core portion and is in contact with the side of the core portion. This configuration improves the strength of the stud by the core portion being surrounded by the inner wall surface of the outer tube portion. Furthermore, the core portion is prevented from slipping out of the outer tube portion due to resistance (e.g., frictional force) that may arise from the contact between the inner wall surface of the outer tube portion and the side of the core portion. As a result, the core portion remains surrounded by the inner wall surface of the outer tube portion. In other words, the stud can be stabilized relative to the outsole. Therefore, in the first disclosure, it is possible to prevent the studs from peeling off from the outsole, and to keep the studs strong.

[0009] The second disclosure is: The present invention relates to a stud for an outsole used in a cleat shoe, and the stud comprises a cylindrical outer tube portion attached to the outsole and a core portion attached inside the outer tube portion. The outer tube portion is seamlessly formed integrally with the outsole. The outer tube portion is configured so that its inner wall surface surrounds the side surface of the core portion and is in contact with the side surface of the core portion. The core portion is provided with a retaining structure to prevent the core portion from slipping out of the outer cylinder portion. The retaining structure is formed in a corner shape at the midpoint of the core in the vertical direction, and includes a corner spaced downward from the upper end of the core. The radial size of the core is smallest at the corner. The radial size of the core gradually increases from the corner upward and downward.

[0010] In this second disclosure, the retaining structure makes it difficult for the core to come off the outer tube, thereby making it possible to further stabilize the studs on the outsole.

[0011] In a third disclosure, in the first or second disclosure, the outer cylinder portion and the core portion are each made of a resin material, and the inner wall surface of the outer cylinder portion and the side surface of the core portion are fused to each other.

[0012] In the third disclosure, the inner wall surface of the outer tube and the side surface of the core are fused together, so that the core is firmly fixed to the outer tube. In other words, the core is less likely to come off the outer tube. Therefore, in the second disclosure, the studs can be made even more stable on the outsole.

[0013] A fourth disclosure is any one of the first to third disclosures, wherein the thickness of the outer cylindrical portion is configured to be smallest at the lower end portion.

[0014] In the fourth disclosure, when the outer tube is formed by injection molding, the resin material heated and melted in the mold device is more likely to fill the outer tube toward the lower end, which reduces the occurrence of sink marks and other problems in the outer tube, making the outer tube more stable in structure.

[0015] A fifth disclosure is any one of the first to fourth disclosures, wherein the lower end of the core is exposed from the lower end of the outer tube.

[0016] In the fifth disclosure, both the outer tube and the core are visible when viewed from the lower end side of the outer tube (i.e., the side where the stud touches the ground). This makes it possible to enhance the design of the stud, for example, by appropriately changing the color scheme of the outer tube and the core.

[0017] A sixth disclosure relates to any one of the first to fifth disclosures, wherein the core has a mold installation structure for installing the core in a mold device for manufacturing an outsole. The mold installation structure includes a first recess formed on an upper side of the core and a second recess formed on a lower side of the core.

[0018] In the sixth disclosure, for example, in the insert process when manufacturing an outsole, the core can be stably installed in a mold device by using the mold installation structure (first and second recesses) that the core has.

[0019] A seventh disclosure is an outsole for a cleat shoe, which includes at least one stud according to any one of the first to sixth disclosures.

[0020] In the seventh disclosure, an outsole for a cleat shoe that provides the same effects as those of the first to sixth disclosures can be obtained.

[0021] The eighth disclosure is the seventh disclosure, further including an outsole body. The studs are disposed on a lower side of the outsole body. The outer tube portion is formed seamlessly and integrally with the outsole body.

[0022] In the eighth disclosure, the outer tube portion is formed seamlessly as a single piece with the outsole body, which, like the first disclosure above, makes it possible to prevent the studs from peeling off from the outsole body.

[0023] The ninth disclosure is a manufacturing method for manufacturing an outsole for a cleated shoe according to the eighth disclosure, in which the studs are molded together with the outsole body by injection molding.

[0024] According to the ninth disclosure, it is possible to stably obtain an outsole for a cleat shoe in which separation of the studs from the outsole body is suppressed.

[0025] A tenth disclosure is a cleat shoe having the outsole of the seventh or eighth disclosure.

[0026] In the tenth disclosure, the studs provided on the outsole body can increase the grip on the ground and improve stability when touching the ground. [Effects of the Invention]

[0027] As described above, according to the present disclosure, it is possible to prevent the studs from peeling off from the outsole and to maintain the strength of the studs. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view showing an outsole according to an embodiment of the present disclosure as viewed from above. [Figure 2] FIG. 2 is a perspective view showing the outsole shown in FIG. 1 as viewed from below. [Figure 3] FIG. 3 is a plan view of the outsole shown in FIG. [Figure 4] FIG. 4 is a bottom view of the outsole shown in FIG. [Figure 5] FIG. 5 is a side view showing the outsole shown in FIG. 1 as viewed from the outer instep side. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a partially enlarged view of the stud configuration shown in FIG. [Figure 8] FIG. 8 is a diagram schematically showing the cross-sectional structure of a mold device for manufacturing an outsole. [Figure 9] FIG. 9 is a view equivalent to FIG. 7 showing the configuration of a stud according to a reference example. [Figure 10] FIG. 10 is a view equivalent to FIG. 7 showing the configuration of a stud according to the first modification. [Figure 11] FIG. 11 is a view equivalent to FIG. 7 showing the configuration of a stud according to the second modification. [Figure 12] FIG. 12 is a view equivalent to FIG. 7 showing the configuration of a stud according to Modification 3. In FIG. [Figure 13] FIG. 13 is a view equivalent to FIG. 7 showing the configuration of a stud according to the fourth modification. [Figure 14] FIG. 14 is a view equivalent to FIG. 7 showing the configuration of a stud according to the fifth modification. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following description of the embodiments is merely exemplary in nature and is not intended to limit the present disclosure, its applications, or its uses.

[0030] 1 to 5 show an outsole 1 for a cleated shoe according to an embodiment of the present disclosure. Cleat shoes equipped with this outsole 1 are used in sports that require quick movements, such as soccer, rugby, American football, and baseball.

[0031] In the embodiment of the present disclosure, the outsole 1 is illustrated as being for the left foot only. The outsole for the right foot is configured to be bilaterally symmetrical with the outsole for the left foot. In the following description, only the outsole for the left foot will be described, and a description of the outsole for the right foot will be omitted.

[0032] In the following description, "upper" and "lower" shown in each figure represent the positional relationship in the up-down direction of the outsole 1. Furthermore, "front" and "rear" shown in each figure represent the positional relationship in the foot length direction (front-to-back direction) of the outsole 1. Furthermore, "medial side" and "lateral side" shown in each figure represent the positional relationship in the foot width direction of the outsole 1.

[0033] (Outsole body) As shown in FIGS. 1 to 6, the outsole 1 includes an outsole body 2. Examples of materials for the outsole body 2 include highly abrasion-resistant resin materials. Specifically, suitable materials for the outsole body 2 include nylon-based elastomers, thermoplastic polyurethanes, styrene-based elastomers, and polyamide-based thermoplastic elastomers. An upper (not shown) is fixed to the periphery of the outsole body 2.

[0034] The upper surface of the outsole body 2 is configured as a sole support surface 3 for supporting the sole of the wearer's foot. The sole support surface 3 may be configured to directly support the sole of the wearer's foot, or may be configured to support the sole of the wearer's foot via an insole (not shown) or the like.

[0035] As shown in Figures 1 and 3, the outsole body 2 has a plurality of round holes 4. Each round hole 4 is formed in a substantially circular shape in a plan view. Each round hole 4 is formed so as to penetrate the outsole body 2 from the sole support surface 3 toward the bottom of the outsole body 2 (see Figures 6 and 7). Each round hole 4 communicates in the vertical direction with an inner hole 13, which will be described later.

[0036] The outsole body 2 has a reinforcing portion 5. The reinforcing portion 5 is made of a hard resin material that is more rigid than the outsole body 2. Specifically, the reinforcing portion 5 is made of, for example, fiber reinforced plastic (FRP), nylon containing glass fiber, carbon fiber reinforced plastic (CFRP), or the like. The reinforcing portion 5 is disposed in a position on the outsole body 2 that corresponds to the range from the midfoot to the rearfoot of the wearer's foot. The upper surface of the reinforcing portion 5 is substantially flush with the sole support surface of the outsole body 2.

[0037] The reinforcing portion 5 has a honeycomb structure 6. The honeycomb structure 6 is composed of a plurality of recesses, each of which has a regular hexagonal shape. This honeycomb structure 6 increases the rigidity of the outsole body 2 in the range from the midfoot to the rearfoot of the wearer.

[0038] As shown in Figures 1 to 3 and 5, the outsole body 2 has a counter portion 7. The counter portion 7 is disposed on the outsole body 2 at a position corresponding to the heel of the wearer's foot. The counter portion 7 is configured to cover the heel of the wearer's foot from both the left and right sides and the rear of the heel.

[0039] As shown in Figures 2 and 4, a central stud 8 is provided on the underside of the outsole body 2. The central stud 8 is made of, for example, a highly abrasion-resistant resin material. Suitable materials for the central stud 8 include, for example, nylon-based elastomer, thermoplastic polyurethane, styrene-based thermoplastic elastomer, and polyamide-based thermoplastic elastomer. The central stud 8 is located on the underside of the outsole body 2 in a position corresponding to the forefoot of the wearer.

[0040] (Stud) 1 and 2, the outsole 1 is provided with a plurality of studs 10 (12 in the illustrated example). The studs 10 are elements that increase the grip of the cleat shoe on the ground when it touches the ground. Each stud 10 is molded together with the outsole body 2 by, for example, injection molding.

[0041] 2 and 4, the studs 10 are arranged in a dispersed manner on the underside of the outsole body 2. Each stud 10 is arranged at a position overlapping with each round hole 4 in the up-down direction.

[0042] The plurality of studs 10 are arranged on the outsole body 2 at positions corresponding to the forefoot and rearfoot of the wearer. The plurality of studs 10 are also arranged at positions corresponding to the vicinity of the medial instep side and the vicinity of the lateral instep side of the outsole body 2. The plurality of studs 10 located near the medial instep side are spaced apart from one another in the foot length direction. The plurality of studs 10 located near the lateral instep side are spaced apart from one another in the foot length direction.

[0043] As shown in FIGS. 6 and 7, each stud 10 has an outer cylinder portion 11 and a core portion 12.

[0044] The outer tube portion 11 is made of the same resin material as the outsole body 2. The outer tube portion 11 has a tubular shape that extends downward from the lower part of the outsole body 2. The outer tube portion 11 of this embodiment is formed in a substantially cylindrical shape.

[0045] The outer tube portion 11 is configured so that its lower end comes into contact with the ground. The outer tube portion 11 is formed so as to gradually taper downward from the base of the lower part of the outsole body 2. In this embodiment, the thickness of the outer tube portion 11 is approximately constant over the range from positions corresponding to corners 14 described below to the lower end of the outer tube portion 11. A characteristic configuration of the present disclosure is that the outer tube portion 11 is formed integrally with the outsole body 2 so as to be seamless.

[0046] As shown in FIG. 7 , the outer tube portion 11 has an inner hole portion 13. The inner hole portion 13 is formed so as to penetrate the outer tube portion 11 in the up-down direction. The inner hole portion 13 communicates with each of the round holes 4 of the outsole body 2. The inner hole portion 13 is formed in a substantially barrel shape in a vertical cross section. In other words, the inner hole portion 13 is formed so as to fit the outer shape of the core portion 12.

[0047] The core 12 in this embodiment is made of a resin material. Specifically, the core 12 is made of a resin material with high abrasion resistance. Suitable resin materials for the core 12 include, for example, nylon-based elastomers, thermoplastic polyurethanes, styrene-based thermoplastic elastomers, and polyamide-based thermoplastic elastomers. In particular, styrene-based thermoplastic elastomers are abrasion-resistant and relatively lightweight compared to other materials. Therefore, by using a styrene-based thermoplastic elastomer as the material for the core 12, it is possible to reduce the weight of the core 12. In other words, the overall weight of the outsole 1 can be reduced.

[0048] The core 12 is provided inside the outer tube 11. Specifically, the core 12 is disposed within the inner bore 13 of the outer tube 11. As a characteristic configuration of the present disclosure, the outer tube 11 is configured such that the inner wall surface of the outer tube 11 surrounds the side surface of the core 12 and the inner wall surface of the outer tube 11 contacts the side surface of the core 12. In particular, in this embodiment, both the outer tube 11 and the core 12 are made of a resin material, and the inner wall surface of the outer tube 11 and the side surface of the core 12 are fused to each other through an injection molding process described below. Furthermore, the core 12 is configured such that the lower end of the core 12 is exposed from the lower end of the outer tube 11. In this embodiment, the inner wall surface of the outer tube 11 is configured to surround the entire side surface of the core 12.

[0049] The core portion 12 has a generally barrel-shaped cross section. Specifically, as shown in FIG. 7 , the core portion 12 has a corner 14. The corner 14 is located near the upper end of the core portion 12. The radial size of the core portion 12 is greatest at the position of this corner 14. The core portion 12 is formed so that its radial size gradually decreases both upward and downward from the corner 14. When the core portion 12 is fitted into the inner bore 13, the corner 14 is locked against the inner wall surface of the outer tubular portion 11. This prevents the core portion 12 from slipping out of the outer tubular portion 11. That is, in the stud 10 of this embodiment, the corner 14 corresponds to a retaining structure that prevents the core portion 12 from slipping out of the outer tubular portion 11.

[0050] As shown in Figure 7, core 12 has a first recess 15 and a second recess 16. First recess 15 is formed on the upper side of core 12. Second recess 16 is formed on the lower side of core 12. First recess 15 and second recess 16 function as a mold mounting structure for mounting core 12 in a mold device 30 (see Figure 8) for manufacturing outsole 1.

[0051] (Outsole manufacturing method) Next, a manufacturing method for the outsole 1 will be described with reference to FIG. 8. This manufacturing method mainly includes an insert process and an injection molding process. In FIG. 8, the position corresponding to the upper surface of the outsole body 2 is shown at the bottom of the page, taking into account the actual manufacturing form. FIG. 8 also shows the state before the resin material that makes up the outsole body 2 and multiple outer tube portions 11 is filled into the molding chamber 31 of the mold device 30. Note that in the following explanation, the above-mentioned reinforcing portions 5 and central stud 8 will be omitted.

[0052] In the inserting step, a plurality of cores 12 are placed at predetermined positions in the mold device 30 for the outsole 1. Specifically, a plurality of first pins 32a and a plurality of second pins 32b are provided in advance at predetermined positions in the molding chamber 31 of the mold device 30. Then, the first recessed portion 15 of each core 12 is aligned with each of the first pins 32a, and the second recessed portion 16 of each core 12 is aligned with each of the second pins 32b. This brings the plurality of cores 12 into a state of being placed at predetermined positions in the mold device 30.

[0053] After the inserting step, the injection molding step is performed by filling the mold device 30 with heated and melted resin material (i.e., the resin material that constitutes the outsole body 2 and each outer tube portion 11) using an injection molding machine (not shown). At this time, the resin material is injected into the molding chamber 31 of the mold device 30 through a gate (not shown) of the mold device 30. Specifically, the resin material is injected from a position in the molding chamber 31 of the mold device 30 that corresponds to the sole support surface 3 of the outsole body 2 toward a position that corresponds to the outer tube portion 11.

[0054] After the resin material is filled into the molding chamber 31 of the mold device 30, a predetermined cooling process is performed on the mold device 30. Through this cooling process, the outsole 1 is obtained.

[0055] The mold device 30 is also used to manufacture conventional outsoles (for example, the outsoles disclosed in Patent Document 1). That is, the mold device 30 can be used to manufacture the outsoles 1 according to the embodiment of the present disclosure and conventional outsoles in combination.

[0056] [Effects of the embodiment] In the studs 10 of the outsole 1 according to the embodiment of the present disclosure, the outer tube portion 11 is seamlessly formed integrally with the outsole body 2 (outsole 1). That is, the outer tube portion 11 is formed continuously with the outsole body 2 (outsole 1). Therefore, even if continuous load is applied to the studs 10 due to various athletic movements performed by the wearer of the cleated shoes during athletic competition, no seam that could be the starting point for separation of the outer tube portion 11 from the outsole body 2 is visible on the outside, making it possible to prevent separation of the studs 10 from the outsole body 2. Examples of such athletic movements include walking, running, kicking a ball, making sudden stops, turning, jumping, and landing. Furthermore, the inner wall surface of the outer tube portion 11 is configured so that the inner wall surface surrounds the side surface of the core portion 12 and is in contact with the side surface of the core portion 12. With this configuration, the strength of the studs 10 is improved by the core portion 12 being surrounded by the inner wall surface of the outer tube portion 11. Furthermore, resistance (e.g., friction) that may be generated by contact between the inner wall surface of the outer tube portion 11 and the side surface of the core portion 12 prevents the core portion 12 from slipping out of the outer tube portion 11. As a result, the core portion 12 remains surrounded by the inner wall surface of the outer tube portion 11. In other words, the studs 10 can be stabilized relative to the outsole body 2. Therefore, with the studs 10 of the outsole 1 according to the embodiment of the present disclosure, separation of the studs 10 from the outsole body 2 (outsole 1) can be suppressed, and the studs 10 can be kept strong.

[0057] The core 12 is also provided with a slip-out prevention structure. This slip-out prevention structure makes it difficult for the core 12 to slip out of the outer tube 11. In particular, in this embodiment, the inner hole 13 of the outer tube 11 and the core 12 are formed in a roughly barrel shape in vertical cross section, and the corners 14 mainly function as the slip-out prevention structure. This makes it difficult for the core 12 to slip out both upward and downward from the outer tube 11. In this way, the studs 10 can be made even more stable relative to the outsole 1.

[0058] Additionally, outer tube 11 and core 12 are each made of a resin material, and the inner wall surface of outer tube 11 and the side surface of core 12 are fused to each other. This results in core 12 being firmly fixed to outer tube 11. In other words, core 12 is less likely to come off outer tube 11. This makes it possible to further stabilize studs 10 relative to outsole 1.

[0059] Furthermore, because the lower end of the core 12 is exposed from the lower end of the outer tube 11, both the outer tube 11 and the core 12 are visible when viewed from the lower end side of the outer tube 11 (i.e., the side where the stud 10 touches the ground). This makes it possible to enhance the design of the stud 10, for example, by appropriately changing the color scheme of the outer tube 11 and the core 12.

[0060] Furthermore, the core 12 has a mold installation structure for installing the core 12 in the mold device 30. The mold installation structure includes a first recess 15 and a second recess 16. According to this configuration, for example, in the above-mentioned insert process, the core 12 can be stably installed in the molding chamber 31 of the mold device 30 by using the mold installation structure (first recess 15 and second recess 16).

[0061] Furthermore, the studs 10 are molded by injection molding together with the outsole body 2. This makes it possible to stably obtain an outsole 1 in which separation of the studs 10 from the outsole body 2 is suppressed.

[0062] [Embodiment Reference example ] The above-mentioned retaining structure is not limited to the specific configuration shown in the above embodiment, and various configurations can be adopted. For example, in the above embodiment, the inner hole 13 and the core 12 of the outer tube 11 have a substantially barrel shape, but the present invention is not limited to this configuration. That is, the retaining structure shown in FIG. Reference example As shown in the figure, the inner hole 13 and the core 12 may be tapered in a vertical cross-sectional view, and the corner 14 of the core 12 may be formed at the upper end of the core 12. Reference example Even if the core portion 12 is in a swaged state, it is possible to prevent the core portion 12 from slipping out of the outer cylinder portion 11 toward both the upper and lower sides.

[0063] [Modification of the embodiment] Also, the modified example shown in FIG. 1 The protrusion 20 may be provided on the core 12 as shown in the figure. This protrusion 20 protrudes radially outward from the outer peripheral surface of the core 12. The protrusion 20 is formed in a substantially rectangular shape in cross section. The protrusion 20 is also located below the corner 14 in the vertical direction of the core 12. By providing such a protrusion 20, the core 12 is less likely to slip out of the outer tube 11 in both the upward and downward directions. That is, the modified example 1 In this case, the corners 14 and the protrusions 20 function as a retaining structure to prevent the device from coming off.

[0064] Also, the modified example shown in FIG. 2 As shown in the figure, a through hole 21 may be further provided in the protruding portion 20. This through hole 21 penetrates the protruding portion 20 in a direction perpendicular to the extension direction of the protruding portion 20. A part of the outer tube portion 11 is inserted into this through hole 21. That is, in this modification, the resin material constituting the outer tube portion 11 is molded in the injection molding process while being filled into the through hole 21. Even in this modification, the core portion 12 is less likely to slip out of the outer tube portion 11 in both the upward and downward directions.

[0065] Furthermore, the modified example shown in FIG. 3 As in, variants 1The protrusion 20 may be formed in a substantially triangular shape in cross section. 1 Similarly, the core portion 12 is less likely to slip out of the outer tube portion 11 in both the upward and downward directions.

[0066] Furthermore, in the core portion 12 of the above embodiment, the radial size of the core portion 12 is maximized at the position of the corner portion 14, but this is not limitative. For example, in the modified example shown in FIG. 4 As shown in the figure, the radial size of the core 12 may be minimized at the position of the corner 14. In this modification, the inner wall surface of the outer tube 11 is locked at the corner 14, making it difficult for the core 12 to slip out of the outer tube 11 in both the upward and downward directions.

[0067] Also, the modified example shown in FIG. 4 In the outer tube 11, the thickness of the outer tube 11 is configured to be smallest at the lower end of the outer tube 11. With this configuration, when the outer tube 11 is formed by injection molding, the heated and melted resin material in the mold device 30 is more likely to fill toward the lower end of the outer tube 11. As a result, molding defects such as sink marks are less likely to occur in the outer tube 11, and the outer tube 11 can be made structurally stable.

[0068] Furthermore, a modified example is shown in FIG. 5 As such, the above modification 4 A protrusion 20 may be further provided at the upper end of the core 12 shown by . Even in this modified example, the core 12 is less likely to slip out of the outer tube 11 in both the upward and downward directions.

[0069] In this way, the above-mentioned modified examples 1 to 5 Even if the studs 10 are in a loosened state, the retaining structure makes it difficult for the core portion 12 to slip out both upward and downward from the outer tube portion 11. As a result, the studs 10 can be stabilized relative to the outsole 1.

[0070] [Other embodiments] In the above embodiment, the outer tubular portion 11 has a cylindrical shape, but is not limited to this. For example, the outer tubular portion 11 may have a polygonal cylindrical shape, including a triangular shape. Alternatively, the outer tubular portion 11 may have a blade shape extending in a predetermined direction.

[0071] In the above embodiment, the inner wall surface of the outer tube portion 11 surrounds the entire side surface of the core portion 12, but this is not limiting. Although not shown, there may be a portion of the side surface of the core portion 12 that is not surrounded by the inner wall surface of the outer tube portion 11. In other words, it is sufficient that the inner wall surface of the outer tube portion 11 is configured to substantially surround the side surface of the core portion 12.

[0072] In the above embodiment, the thickness of the outer tubular portion 11 is substantially constant in the range from the position corresponding to the corner 14 to the lower end of the outer tubular portion 11 (see FIG. 7), but this is not limiting. For example, although not shown, the thickness of the outer tubular portion 11 may be configured to gradually decrease from the position corresponding to the corner 14 toward the lower end of the outer tubular portion 11. Even with such a configuration, the modified example shown in FIG. 4 Similarly, it is possible to make the thickness of the outer tubular portion 11 smallest at the lower end of the outer tubular portion 11. 4 Similarly, molding defects such as sink marks are less likely to occur in the outer cylinder portion 11, and the outer cylinder portion 11 can be made structurally stable.

[0073] In the above embodiment, a resin material is used as the material of the core 12, but the material is not limited to this. That is, materials other than a resin material (metal material, ceramic material, etc.) may be used as the material of the core 12.

[0074] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the present disclosure. [Industrial Applicability]

[0075] The present disclosure is industrially applicable to studs for outsoles used in cleat shoes, outsoles, methods for manufacturing outsoles, and cleat shoes. [Explanation of symbols]

[0076] 1: Outsole 2: Outsole body 3: Sole support surface 4:Round hole part 5: Reinforcement section 6: Honeycomb structure 7: Counter section 8: Center stud 10: Stud 11: Outer cylinder 12: Core 13: Inner hole 14: Corner 15: First recess 16: Second recess 20:Protrusion 21:Through hole 30:Molding equipment 31: Molding room 32a: 1st pin 32b: 2nd pin

Claims

1. A stud on an outsole used in a cleat shoe, a cylindrical outer cylinder portion provided on the outsole; a core portion provided inside the outer cylinder portion, The outer tube portion is formed integrally with the outsole without any seams, the outer cylinder portion is configured such that an inner wall surface of the outer cylinder portion surrounds a side surface of the core portion and the inner wall surface is in contact with the side surface of the core portion, The core portion is provided with a retaining structure to prevent the core portion from slipping out of the outer tube portion, The retaining structure is formed in a corner shape at a vertical midpoint of the core portion, and includes a corner portion spaced downward from an upper end portion of the core portion, At the position of the corner, the radial size of the core portion is maximum, A stud on an outsole, wherein the radial size of the core portion gradually decreases from the corner portion upward and downward.

2. A stud for an outsole used in a cleat shoe, comprising: a cylindrical outer cylinder portion provided on the outsole; a core portion provided inside the outer cylinder portion, The outer tube portion is formed integrally with the outsole without any seams, the outer cylinder portion is configured such that an inner wall surface of the outer cylinder portion surrounds a side surface of the core portion and the inner wall surface is in contact with the side surface of the core portion, The core portion is provided with a retaining structure to prevent the core portion from slipping out of the outer tube portion, The retaining structure is formed in a corner shape at a vertical midpoint of the core portion, and includes a corner portion spaced downward from an upper end portion of the core portion, At the position of the corner, the radial size of the core portion is minimum, A stud on an outsole, wherein the radial size of the core portion gradually increases from the corner portion upward and downward.

3. The stud of the outsole according to claim 1 or 2, the outer cylinder portion and the core portion are each made of a resin material, The stud of the outsole has an inner wall surface of the outer tube portion and a side surface of the core portion fused to each other.

4. The studs for the outsole according to any one of claims 1 to 3, A stud for an outsole, wherein the thickness of the outer tube portion is smallest at the lower end.

5. The studs for the outsole according to any one of claims 1 to 4, A stud on an outsole, the lower end of the core being exposed from the lower end of the outer tube.

6. The studs for an outsole according to any one of claims 1 to 5, the core has a mold installation structure for installing the core in a mold device for manufacturing the outsole, The mold installation structure includes: a first recess formed on an upper side of the core; a second recess formed on a lower side of the core.

7. An outsole for a cleat shoe, comprising at least one stud according to any one of claims 1 to 6.

8. The outsole for a cleat shoe according to claim 7, It also includes an outsole body, the studs are disposed on an underside of the outsole body; The outer tube portion is formed seamlessly and integrally with the outsole body, in an outsole for cleat shoes.

9. A manufacturing method for manufacturing an outsole for a cleated shoe according to claim 8, comprising: The method for manufacturing an outsole, wherein the studs are molded together with the outsole body by injection molding.

10. A cleat shoe comprising the outsole for a cleat shoe according to claim 7 or 8.

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