Sole part for spike shoe, sole for spike shoe, and spike shoe

Abstract

A spike shoe sole part (5A) includes: a plate portion (10) made of a fiber-reinforced resin and including a reinforcement region containing reinforcement fibers (13); and a receiving portion (20) to which a cleat (30) is attachable, the receiving portion being made of metal. The receiving portion (20) includes a cylindrical portion (21) and a flange portion (23), and is embedded in the plate portion (10). The plate portion (10) includes an overlapping region (A) overlapping the receiving portion (20) and a non-overlapping region (B) not overlapping the receiving portion (20). The reinforcement region is located to straddle the overlapping region (A) and the non-overlapping region (B). The reinforcement region is fixed to a surface of the flange portion (23) and an outer peripheral surface of the cylindrical portion (21). An average length (L) of the reinforcement fibers (13) contained in the reinforcement region is longer than a protrusion length (D) of the flange portion (23).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to: a sole part for a spike shoe (which may be hereinafter referred to as a "spike shoe sole part" or simply as a "sole part") to which a cleat can be detachably attached; a sole for a spike shoe (which may be hereinafter referred to as a "spike shoe sole" or simply as a "sole"); and a spike shoe.BACKGROUND

[0002] Conventionally, as spike shoes each having a ground contact surface provided with protrusions, there have been known: a spike shoe having a sole to which protrusions are integrally attached so as not to be replaceable; and a spike shoe having a sole to which protrusions are detachably attached so as to be replaceable. In the latter spike shoe, each of the protrusions is also referred to as a cleat, and the sole is provided with a receiving portion in which the cleat is held.

[0003] In general, a cleat is often formed of a metal member, and a receiving portion in which the cleat is held is also often formed of a metal member. On the other hand, in general, a sole is often formed of a non-metal member made of a material such as resin or rubber, and thus, the receiving portion made of metal is generally embedded in a non-metal sole. For example, Japanese Patent Laying-Open No. 2000-166614 (PTL 1) discloses a spike shoe having a sole in which a receiving portion is embedded in this way. From the viewpoint of ease of production and enhancement of the fixing strength, the receiving portion is preferably embedded in the sole by what is called insert molding.

[0004] On the other hand, in recent years, there has been a widespread use of shoes each having a sole provided with a highly rigid plate made of a fiber-reinforced resin so as to suppress dorsiflexion of the sole occurring particularly during running, to thereby increase the forward propulsive force when a wearer's foot pushes off the ground. For example, Japanese National Patent Publication No. 2018-529461 (PTL 2) discloses a shoe having this type of sole.CITATION LISTPATENT LITERATURE

[0005] PTL 1: Japanese Patent Laying-Open No. 2000-166614 PTL 2: Japanese National Patent Publication No. 2018-529461 SUMMARYTECHNICAL PROBLEM

[0006] When it is assumed that the spike shoe is provided with the above-mentioned highly rigid plate made of a fiber-reinforced resin, it is conceivable that the receiving portion is embedded in the highly rigid plate by insert molding.

[0007] However, unlike a commonly-used resin employed for insert molding, the fiber-reinforced resin is not easily molded. Further, from the viewpoint of reduction in weight and implementation of its function, the highly rigid plate made of a fiber-reinforced resin needs to be formed to be relatively thin, but the height of the above-mentioned receiving portion is significantly larger than the thickness of the highly rigid plate made of a fiber-reinforced resin and formed to be relatively thin.

[0008] For the reasons as described above, it is significantly difficult to integrally provide the receiving portion in the highly rigid plate made of a fiber-reinforced resin by insert molding while satisfying the requirements such as durability and weight reduction. In particular, in order to enhance the durability, it is important to sufficiently ensure the strength of bonding between the highly rigid plate made of a fiber-reinforced resin and the receiving portion, for which some modification for improvement is indispensable.

[0009] Thus, the present disclosure has been made in view of the above-described problems, and makes it possible to provide a spike shoe sole part, a spike shoe sole, and a spike shoe, in which a receiving portion to which a cleat is attached is provided by insert molding in a plate portion made of a fiber-reinforced resin while allowing the strength of bonding between the plate portion and the receiving portion to be sufficiently ensured.SOLUTION TO PROBLEM

[0010] A spike shoe sole part according to the present disclosure includes a plate portion and a receiving portion. The plate portion has a first main surface and a second main surface located opposite to the first main surface. A cleat is detachably attachable to the receiving portion, and the receiving portion is partially embedded in the plate portion. The receiving portion is formed of a metal member including: a cylindrical portion in which the cleat is received and held; and a flange portion protruding outward from an outer peripheral surface of the cylindrical portion. The plate portion is formed of a molded component made of a fiber-reinforced resin and including at least a reinforcement region in which reinforcement fibers are contained in a resin as a base material. The receiving portion is embedded in the plate portion in a state in which an end portion of a hollow portion as a space inside the cylindrical portion on a side of the first main surface in an axial direction of the hollow portion is exposed to outside such that the cleat is attachable and detachable on the side of the first main surface. When viewed in a direction parallel to the axial direction of the hollow portion, the plate portion includes: an overlapping region overlapping the receiving portion; and a non-overlapping region not overlapping the receiving portion. The reinforcement region is located to straddle at least the overlapping region and the non-overlapping region. A portion of the reinforcement region that is located in the overlapping region is fixed to a surface of the flange portion on a side of the first main surface, a surface of the flange portion on a side of the second main surface, and an outer peripheral surface of the cylindrical portion. An average length of the reinforcement fibers contained in a portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region is longer than a protrusion length of the flange portion protruding from the cylindrical portion.

[0011] A spike shoe sole according to the present disclosure includes the spike shoe sole part according to the above-described present disclosure.

[0012] A spike shoe according to the present disclosure includes: the spike shoe sole according to the above-described present disclosure; and an upper provided above the spike shoe sole.ADVANTAGEOUS EFFECTS OF INVENTION

[0013] According to the present disclosure, it is possible to provide a spike shoe sole part, a spike shoe sole, and a spike shoe in which a receiving portion to which a cleat is attached is provided by insert molding in a plate portion made of a fiber-reinforced resin while allowing the strength of bonding between the plate portion and the receiving portion to be sufficiently ensured.BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Fig. 1 is a side view of a spike shoe according to a first embodiment when viewed from a lateral foot side. Fig. 2 is a bottom view of the spike shoe shown in Fig. 1. Fig. 3 is a bottom view of a spike shoe sole part according to the first embodiment. Fig. 4 is a schematic cross-sectional view taken along a line IV-IV shown in Fig. 3. Fig. 5 is a schematic diagram for illustrating a method of manufacturing the spike shoe sole part according to the first embodiment. Fig. 6 is a schematic diagram for illustrating the method of manufacturing the spike shoe sole part according to the first embodiment. Fig. 7 shows a schematic cross-sectional view and a bottom view of a main part of a spike shoe sole part according to a second embodiment. Fig. 8 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a first modification. Fig. 9 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a second modification. Fig. 10 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a third modification. Fig. 11 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a fourth modification. Fig. 12 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a fifth modification. Fig. 13 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a sixth modification. Fig. 14 is a schematic cross-sectional view of a main part of a spike shoe sole part according to a seventh modification. Fig. 15 is a schematic cross-sectional view of a main part of a spike shoe sole part according to an eighth modification. Fig. 16 is a bottom view of a spike shoe according to a third embodiment. DETAILED DESCRIPTION

[0015] The following describes embodiments of the present disclosure in detail with reference to the accompanying drawings. In the embodiments described below, the same or corresponding portions are denoted by the same reference characters, and the description thereof will not be repeated.<First Embodiment>

[0016] Fig. 1 is a side view of a spike shoe according to the first embodiment when viewed from a lateral foot side. Fig. 2 is a bottom view of the spike shoe shown in Fig. 1. Fig. 3 is a bottom view of a spike shoe sole part shown in Figs. 1 and 2. Fig. 4 is a schematic cross-sectional view taken along a line IV-IV shown in Fig. 3. Referring to Figs. 1 to 4, the following first describes configurations of a spike shoe 1, a spike shoe sole 3, and a spike shoe sole part 5A according to the present embodiment.

[0017] As shown in Figs. 1 and 2, the spike shoe 1 includes an upper 2 and a sole 3. The sole 3 is a member supporting a bottom of a wearer's foot and has a substantially flat shape. The sole 3 has a bottom surface provided with a ground contact surface 3a that lands on the ground during use such as during walking and running. The upper 2 is a member configured to receive and hold the wearer's foot and shaped to cover the substantially entire portion extending from an ankle of the inserted wearer's foot to a distal end. The upper 2 is located above the sole 3. The upper 2 and the sole 3 are bonded to each other, for example, by adhesion or the like.

[0018] The sole 3 is divided into a forefoot portion R1, a midfoot portion R2, and a rearfoot portion R3 in a front-rear direction (in a left-right direction in Fig. 1 and an up-down direction in Fig. 2) that corresponds to a foot length direction of the wearer's foot in a plan view. The forefoot portion R1 supports a toe portion and a ball portion of the wearer's foot, the midfoot portion R2 supports an arch portion of the wearer's foot, and the rearfoot portion R3 supports a heel portion of the wearer's foot.

[0019] In this case, with reference to the front end of the sole 3, a first boundary position is defined at a position located at 40% of the dimension of the sole 3 from the front end in the front-rear direction, and a second boundary position is defined at a position located at 70% of the dimension of the sole 3 from the front end in the front-rear direction. In this case, the forefoot portion R1 corresponds to a portion included between the front end of the sole 3 and the first boundary position in the front-rear direction, the midfoot portion R2 corresponds to a portion included between the first boundary position and the second boundary position in the front-rear direction, and the rearfoot portion R3 corresponds to a portion included between the second boundary position and the rear end of the sole 3 in the front-rear direction.

[0020] Further, as shown in Fig. 2, the sole 3 is divided into a medial foot-side portion (a portion on the S1 side shown in the figure) and a lateral foot-side portion (a portion on the S2 side shown in the figure) in the left-right direction corresponding to a foot width direction of the wearer's foot (in the left-right direction in the figure) when viewed in a plan view. In this case, the medial foot-side portion corresponds to the medial side of the foot in anatomical position (i.e., the side close to the midline) and the lateral foot-side portion is opposite to the medial side of the foot in anatomical position (i.e., the side away from the midline).

[0021] In this case, a boundary line dividing the sole 3 into the medial foot-side portion and the lateral foot-side portion is what is called a shoe center SC. The shoe center SC is an imaginary straight line obtained by projecting a straight line onto the sole 3 in the up-down direction in the state in which a standard wearer having a foot size suitable for the spike shoe 1 wears the spike shoe 1, the straight line connecting a central portion of a calcaneus bone (what is called a heel center (the heel center is indicated by a reference character "HC" in Figs. 2 and the like)) to a portion between the first toe and the second toe of this standard wearer. The front end and the rear end of the sole 3 described above correspond to the ends of the sole 3 located on the shoe center SC.

[0022] As shown in Figs. 1 and 2, the sole 3 mainly includes a midsole 4, the sole part 5A, a medial foot-side outsole 6A, and a lateral foot-side outsole 6B. The midsole 4 defines a top surface of the sole 3 to which the upper 2 is attached, and is formed to be relatively thick. The sole part 5A is formed to be thinner than the midsole 4, and attached to the midsole 4 so as to partially cover a bottom surface of the midsole 4. The medial foot-side outsole 6A and the lateral foot-side outsole 6B are attached to the midsole 4 so as to cover prescribed positions on the bottom surface of the midsole 4.

[0023] More specifically, in the spike shoe 1 according to the present embodiment, a portion of the sole part 5A excluding its rear end portion is attached to the bottom surface of the midsole 4 and the rear end portion of the sole part 5A is embedded in the midsole 4 such that the sole part 5A is exposed to outside in the forefoot portion R1 and the midfoot portion R2 while the sole part 5A is not exposed to outside in the rearfoot portion R3. Further, the medial foot-side outsole 6A and the lateral foot-side outsole 6B are attached to a portion of the bottom surface of the midsole 4 in which the sole part 5A is embedded.

[0024] Thereby, the ground contact surface 3a of the sole 3 is defined mainly by the sole part 5A in the forefoot portion R1 and the midfoot portion R2, and also defined mainly by the medial foot-side outsole 6A and the lateral foot-side outsole 6B in the rearfoot portion R3. In a portion of the bottom surface of the sole 3 in which the sole part 5A, the medial foot-side outsole 6A, and the lateral foot-side outsole 6B are not provided, the ground contact surface 3a is defined by a portion of the bottom surface of the midsole 4 that is exposed to outside.

[0025] In this case, the attachment of the sole part 5A to the midsole 4, and the attachment of the medial foot-side outsole 6A and the lateral foot-side outsole 6B to the midsole 4 can be made, for example, by bonding or the like. Further, in order to embed the rear end portion of the sole part 5A within the midsole 4 in the rearfoot portion R3, for example, the midsole 4 may be prepared as a plurality of divided members, and the rear end portion of the sole part 5A may be sandwiched by these divided midsoles 4.

[0026] It should be noted that the sole part 5A does not necessarily have to be partially embedded in the midsole 4, but the sole part 5A may be attached to the midsole 4 so as to substantially entirely cover the bottom surface of the midsole 4. In that case, the medial foot-side outsole 6A and the lateral foot-side outsole 6B do not necessarily have to be provided, but can be omitted. Further, in the present embodiment, the outsole is formed of two members including the medial foot-side outsole 6A and the lateral foot-side outsole 6B, but the outsole may be formed of one member, or may be formed of three or more members.

[0027] The midsole 4 is preferably excellent in shock absorbing performance while having proper strength. From this viewpoint, the midsole 4 is made, for example, using a resin-made foam material containing: a resin material as a main component; and a foaming agent and a cross-linking agent as sub-components. Alternatively, the midsole 4 may be made using a rubber-made foam material containing: a rubber material as a main component; and a plasticizer, a foaming agent, a reinforcing agent, and a cross-linking agent as sub-components.

[0028] Examples of the above-mentioned resin material applicable in this case may be an ethylene-vinyl acetate copolymer (EVA), a polyolefin resin, thermoplastic polyurethane, a thermoplastic polyamide-based elastomer (TPA, TPAE), a thermoplastic polyester-based elastomer, or the like. As the above-mentioned rubber material, for example, butadiene rubber may be suitably applicable.

[0029] Thereby, the midsole 4 is generally formed of a soft member with a low elastic modulus. Thus, the midsole 4 is relatively easily elastically deformed when it receives a compressive load, and thereby, attains excellent shock absorbing performance.

[0030] On the other hand, the sole part 5A is formed of a composite component including a plate portion 10 and a plurality of receiving portions 20 as will be described later, and is made of a material higher in rigidity than the material forming the midsole 4. The plate portion 10 as a base of the sole part 5A is made of a fiber-reinforced resin. In this case, examples of reinforcing fibers are carbon fibers, glass fibers, cellulose fibers (including cellulose nanofibers), aramid fibers, Dyneema fibers, Zylon fibers, boron fibers, and the like. Further, for the resin as a base material, a thermoplastic resin or a thermosetting resin can be used. For example, an epoxy resin, a polyester resin, a phenol resin, a polyamide resin, a polypropylene resin, a polyethylene resin, a polyurethane resin, and the like can be used.

[0031] Accordingly, the sole part 5A is formed of a hard member with a remarkably high elastic modulus. Thus, when the wearer's foot pushes off the ground, the sole part 5A receives a high load and thereby undergoes elastic deformation, which then causes restoring force in the sole part 5A, and this restoring force acts as high repulsive force on the ground. Therefore, providing the sole part 5A in the sole 3 makes it possible to dramatically increase the forward propulsive force at the time when the wearer's foot pushes off the ground.

[0032] In this case, the effect of enhancing the forward propulsive force obtained by the above-mentioned repulsive force when the wearer's foot pushes off the ground is achieved mainly by the plate portion 10 of the sole part 5A. In other words, the plate portion 10 of the sole part 5A functions as what is called a highly rigid plate. On the other hand, the plurality of receiving portions 20 combined in the plate portion 10 are equipped with the cleats 30 and thereby exert an effect of strengthening the propulsive force at the time when the wearer's foot pushes off the ground. The details of this effect will be described later.

[0033] The medial foot-side outsole 6A and the lateral foot-side outsole 6B are preferably excellent in wear resistance and grip performance. From this viewpoint, the medial foot-side outsole 6A and the lateral foot-side outsole 6B each are formed, for example, of a resin or rubber member higher in hardness and elastic modulus than the midsole 4.

[0034] As shown in Figs. 1 to 4, the sole part 5A is entirely formed of a substantially plate-shaped member, and includes the plate portion 10 and the plurality of receiving portions 20. The plate portion 10 serves as a base of the sole part 5A and the plurality of receiving portions 20 serve as portions in which the respective cleats 30 are received and held. In this case, the cleat 30 protrudes in a pin shape from the ground contact surface 3a of the sole 3 to thereby enhance the propulsive force at the time when the wearer's foot pushes off the ground.

[0035] The plate portion 10 has a first main surface 10a located on the side of the ground contact surface 3a and a second main surface 10b (see Fig. 4) located on the side opposite to the first main surface 10a. Each of the plurality of receiving portions 20 is embedded in the plate portion 10 so as to be exposed on the side of the first main surface 10a.

[0036] As shown in Figs. 2 and 3, a portion of the plate portion 10 that corresponds to the forefoot portion R1 is provided centrally with an opening 11 extending in the front-rear direction. Thereby, in the forefoot portion R1, the plate portion 10 extends in a substantially U-shape in a plan view along a toe portion, a medial foot-side portion, and a lateral foot-side portion. Further, in the midfoot portion R2 and the rearfoot portion R3, the plate portion 10 is located to straddle the medial foot-side portion and the lateral foot-side portion.

[0037] The plurality of receiving portions 20 include a total of four receiving portions specifically including: a receiving portion 20A disposed close to the front end of the forefoot portion R1 and located in the medial foot-side portion; a receiving portion 20B disposed close to the rear end of the forefoot portion R1 and located in the medial foot-side portion; a receiving portion 20C disposed close to the front end of the forefoot portion R1 and located in the lateral foot-side portion; and a receiving portion 20D disposed close to the rear end of the forefoot portion R1 and located in the lateral foot-side portion. These four receiving portions 20A to 20D have the same shape.

[0038] In this case, the sole part 5A is what is called an insert molded component and is formed of a composite component formed by integrating the plate portion 10 and the plurality of receiving portions 20. The sole part 5A is manufactured in the following manner. Specifically, in the case where the plate portion 10 is molded, the plate portion 10 before molding is attached so as to cover a part of the surface of each of the plurality of receiving portions 20, and the plate portion 10 is solidified in this state while it is molded, with the result that the sole part 5A is manufactured. Thereby, a part of each of the plurality of receiving portions 20 is attached to the plate portion 10 in the state in which it is embedded in the plate portion 10 as described above. Thus, the plate portion 10 is fixed to the surface of the receiving portion 20 at the boundary portion between the plate portion 10 and each of the plurality of receiving portions 20.

[0039] As shown in Figs. 3 and 4, each of the plurality of receiving portions 20 has a nut shape provided with a female thread portion 20a. On the other hand, as shown in Fig. 4, each of the plurality of cleats 30 has a pin shape provided with a male thread portion 30a.

[0040] Thus, the male thread portion 30a provided in each of the plurality of cleats 30 is screwed into the female thread portion 20a provided in each of the plurality of receiving portions 20. Thereby, each of the plurality of cleats 30 is fixed in a corresponding one of the plurality of receiving portions 20, so that the plurality of cleats 30 can be attached to the sole part 5A. The cleat 30 is attached to and detached from the sole part 5A in the direction along an arrow DR shown in Fig. 4.

[0041] As shown in Figs. 1 to 3, a plurality of protrusions 18 are provided at prescribed positions on the first main surface 10a of the plate portion 10 in a portion where the plurality of receiving portions 20 are not provided. The plurality of protrusions 18 protrude from the ground contact surface 3a of the sole 3 in the same manner as the plurality of cleats 30 described above, and thereby enhance the propulsive force at the time when the wearer's foot pushes off the ground.

[0042] As shown in Figs. 2 and 3, the plurality of protrusions 18 are located to surround the plurality of receiving portions 20. Thus, some of the plurality of protrusions 18 are arranged contiguously between a pair of adjacent receiving portions (i.e., between the receiving portions 20A and 20B, between the receiving portions 20A and 20C, and between the receiving portions 20C and 20D) among the plurality of receiving portions 20.

[0043] Thereby, the pair of adjacent receiving portions 20 are intermittently connected by the plurality of protrusions 18 provided therebetween. In other words, in a portion of the plate portion 10 located between the pair of receiving portions 20 spaced apart from each other at different positions, the plurality of protrusions 18 are provided as ribs that intermittently connect the pair of receiving portions 20. In such a configuration, the plurality of protrusions 18 as the ribs not only contribute to the enhancement of the propulsive force when the wearer's foot pushes off the ground, but also implement a function of reinforcing the portion of the plate portion 10 that is located between the receiving portions 20.

[0044] The following describes a detailed structure of a portion having the receiving portion 20 in the sole part 5A and the vicinity thereof particularly with reference to Fig. 4. Fig. 4 is a diagram showing a cross section of the receiving portion 20D among the four receiving portions 20A to 20D provided in the sole part 5A and the vicinity of the receiving portion 20D. It should be noted that these four receiving portions 20A to 20D have the same shape as described above, and the structures in the vicinity of these four receiving portions 20A to 20D are also substantially the same. Thus, in the following description, the receiving portions 20A to 20D are interchangeable.

[0045] As shown in Fig. 4, the receiving portion 20 includes a cylindrical portion 21, a bottom portion 22, and a flange portion 23. The cylindrical portion 21 serves as a portion in which the cleat 30 is received and held, and has a hollow portion 24 therein. The cylindrical portion 21 has an inner peripheral surface provided with the female thread portion 20a as mentioned above. The bottom portion 22 has a substantially disk shape and closes an end portion of the hollow portion 24 on the side of the second main surface 10b in the axial direction (in the extending direction of an axial line AX shown in the figure) of the hollow portion 24. The flange portion 23 protrudes outward from an outer peripheral surface 21a of the cylindrical portion 21 and has an annular plate shape surrounding the cylindrical portion 21 in its circumferential direction.

[0046] In this case, the flange portion 23 may be provided at any position on the cylindrical portion 21 in the axial direction of the cylindrical portion 21, but is preferably provided at some intermediate position on the cylindrical portion 21 in its axial direction or at an end portion of the cylindrical portion 21 on the side where the bottom portion 22 is located (i.e., an end portion on the side of the second main surface 10b). In the sole part 5A shown in the figure, the flange portion 23 is provided at some intermediate position on the cylindrical portion 21 that is close to the end portion of the cylindrical portion 21 on the side where the bottom portion 22 is located.

[0047] As described above, the receiving portion 20 is embedded in the plate portion 10 so as to be exposed on the side of the first main surface 10a. More specifically, the receiving portion 20 is embedded in the plate portion 10 such that an end portion of the hollow portion 24 on the side of the first main surface 10a in the axial direction of the hollow portion 24 is exposed to outside. Thereby, the hollow portion 24 provided inside the receiving portion 20 is exposed to outside, and thus, the cleat 30 can be inserted into the hollow portion 24, so that the cleat 30 can be attached and detached on the side of first main surface 10a.

[0048] The receiving portion 20 is formed of a member made of metal such as aluminum, iron, titanium, or an alloy thereof. The size of the receiving portion 20 is not particularly limited, but the inner diameter thereof is preferably, for example, 5.0 mm or more and 19.0 mm or less, and the height (the length in the axial direction) thereof is preferably, for example, 4.6 mm or more and 6.0 mm or less. Further, the thickness of the flange portion 23 is preferably, for example, 0.5 mm or more and 1.5 mm or less, and a protrusion length D of the flange portion 23 protruding from the outer peripheral surface 21a of the cylindrical portion 21 is preferably, for example, 1.0 mm or more and 12.0 mm or less.

[0049] On the other hand, the plate portion 10 is made of a fiber-reinforced resin as described above. In this case, the plate portion 10 includes a reinforcement region in which reinforcement fibers 13 are contained in a resin 12 as a base material. The reinforcement region may be provided in the entire plate portion 10 or may be provided in a part of the plate portion 10. As will be described later in detail, the reinforcement region needs to be provided at least in a portion of the plate portion 10 that straddles an overlapping region A and a non-overlapping region B (both of which will described later).

[0050] The plate portion 10 includes the overlapping region A overlapping the receiving portion 20 and the non-overlapping region B not overlapping the receiving portion 20 when viewed in the direction parallel to the axial direction of the hollow portion 24 of the receiving portion 20 described above. In this case, the overlapping region A includes not only a portion overlapping the cylindrical portion 21 and the bottom portion 22 of the receiving portion 20 but also a portion overlapping the flange portion 23 of the receiving portion 20.

[0051] The plate portion 10 is located to surround the receiving portion 20 such that the thickness direction thereof is parallel to the height direction of the receiving portion 20. More specifically, the plate portion 10 covers: a first main surface-side surface 23a of the flange portion 23 on the side of the first main surface 10a; a second main surface-side surface 23b of the flange portion 23 on the side of the second main surface 10b; the outer peripheral surface 21a of the cylindrical portion 21; and a surface 22a of the bottom portion 22 on the side of the second main surface 10b.

[0052] In this case, the sole part 5A is formed of what is called an insert molded component as described above. Thus, at the boundary portion between the plate portion 10 and the receiving portion 20, the plate portion 10 is fixed to the surface of the receiving portion 20. More specifically, the plate portion 10 is fixed to each of the first main surface-side surface 23a and the second main surface-side surface 23b of the flange portion 23 and the outer peripheral surface 21a of the cylindrical portion 21, and fixed also to the surface 22a of the bottom portion 22 on the side of the second main surface 10b.

[0053] In such a configuration, the portions of the outer surfaces of the receiving portion 20 excluding an axial end surface 21b on the side of the first main surface 10a are entirely covered with the plate portion 10 and bonded thereto, so that the strength of bonding between the plate portion 10 and the receiving portion 20 can be enhanced.

[0054] Further, due to a configuration in which the plate portion 10 covers the flange portion 23 located to protrude from the outer peripheral surface 21a of the cylindrical portion 21, the strength of bonding between the plate portion 10 and the receiving portion 20 is enhanced not only by the increased bonding area but also by the flange portion 23 located to dig into the plate portion 10.

[0055] Further, the plate portion 10 includes: a thick portion 14 located outside the cylindrical portion 21 and close to the cylindrical portion 21; and a thin portion 15 located outside the thick portion 14. The thick portion 14 includes portions of the plate portion 10 that are fixed to the first main surface-side surface 23a and the second main surface-side surface 23b of the flange portion 23 and the outer peripheral surface 21a of the cylindrical portion 21.

[0056] A portion of the first main surface 10a that is located in the thick portion 14 has a portion adjacent to the cylindrical portion 21 and contiguous to the axial end surface 21b of the cylindrical portion 21 on the side of the first main surface 10a, the axial end surface 21b being exposed to outside. The configuration as described above enables a sufficient thickness of the portion of the plate portion 10 that is adjacent to the receiving portion 20, so that the strength of bonding between the plate portion 10 and the receiving portion 20 is enhanced.

[0057] The portion of the first main surface 10a that is located in the thick portion 14 includes a first curved surface 16 that extends toward the second main surface 10b away from the cylindrical portion 21 to smoothly connect to the portion of the first main surface 10a that is located in the thin portion 15. In addition, the portion of the second main surface 10b that is located in the thick portion 14 includes a second curved surface 17 that extends toward the first main surface 10a away from the cylindrical portion 21 to smoothly connect to the portion of the second main surface 10b that is located in the thin portion 15.

[0058] Thereby, a portion of the plate portion 10 that surrounds the receiving portion 20 has a shape bulged more in the thickness direction than its surroundings. In such a configuration, the plate portion 10 as what is called a highly rigid plate can be reduced in thickness while a larger area of bonding between the plate portion 10 and the receiving portion 20 can be ensured, so that the strength of bonding between the plate portion 10 and the receiving portion 20 can be enhanced.

[0059] In this case, the thickness of the portion of the plate portion 10 that is located in the thick portion 14 is not particularly limited, but is preferably 1.5 mm or more and 7.0 mm or less. On the other hand, the thickness of the portion of the plate portion 10 that is located in the thin portion 15 is also not particularly limited, but is preferably 0.5 mm or more and 2.5 mm or less as long as this thickness is smaller than the thickness of the thick portion 14.

[0060] In this case, in the sole part 5A according to the present embodiment, the reinforcement region provided in the plate portion 10 and formed of the resin 12 as the base material containing the reinforcement fibers 13 is located to straddle the overlapping region A and the non-overlapping region B. In other words, when viewed in the direction parallel to the axial direction of the hollow portion 24, the reinforcement region extends in the direction orthogonal to the axial direction of the hollow portion 24 so as to include a portion corresponding to the tip end of the flange portion 23. Also, in the sole part 5A shown in the figure, the plate portion 10 shown in the figure is entirely configured as the reinforcement region.

[0061] By way of example, the reinforcement region may be a random orientation region in which the reinforcement fibers 13 are randomly oriented in the resin 12 as a base material, or may be a non-random orientation region in which the reinforcement fibers 13 are regularly oriented in the resin 12 as a base material. The non-random orientation region may be, for example, a region in which the reinforcement fibers 13 are oriented in one direction, or a region in which the reinforcement fibers 13 are oriented in a plurality of directions such as two directions or three directions. In the present embodiment, the reinforcement region is a random orientation region.

[0062] An average length L of the reinforcement fibers 13 included in this random orientation region is longer than the above-mentioned protrusion length D of the flange portion 23 protruding from the outer peripheral surface 21a (this satisfies a condition of 1.0 < L / D). For ease of understanding in the figures, the length of one reinforcement fiber 13 is defined as L, but the average length L of the reinforcement fibers mentioned herein is the average length of the plurality of reinforcement fibers 13 included in the random orientation region.

[0063] In such a configuration, in the boundary portion between the overlapping region A and the non-overlapping region B that is most fragile structurally due to the difference in rigidity between the plate portion 10 and the receiving portion 20, a large number of reinforcement fibers 13 are present in the resin 12 so as to straddle the boundary portion. This makes it possible to reliably achieve the effect of reinforcing this fragile portion, so that the fracture strength at the boundary surface between the plate portion 10 and the receiving portion 20 can be dramatically enhanced.

[0064] In order to allow a large number of reinforcement fibers 13 to be present in the resin 12 so as to straddle the above-mentioned boundary portion, the longer reinforcement fibers 13 are more preferable, and also, the average length L of the reinforcement fibers 13 and the protrusion length D of the flange portion 23 protruding from the outer peripheral surface 21a preferably satisfy a condition of 1.08 ≤ L / D, more preferably satisfy a condition of 1.15 ≤ L / D, and still more preferably satisfy a condition of 1.30 ≤ L / D.

[0065] Further, assuming that H represents the axial length of the portion of the cylindrical portion 21 from the flange portion 23 to the first main surface 10a (i.e., the distance from the axial end surface 21b of the cylindrical portion 21 to a portion of connection between the first main surface-side surface 23a of the flange portion 23 and the outer peripheral surface 21a of the cylindrical portion 21), it is preferable that the average length L of the reinforcement fibers 13, the protrusion length D of the flange portion 23, and the axial length H of the cylindrical portion 21 further satisfy a condition of 1 < L / (D + H). In such a configuration, a larger number of reinforcement fibers 13 can be located to straddle the above-described boundary portion, so that the fracture strength at the boundary surface between the plate portion 10 and the receiving portion 20 can be further reliably enhanced.

[0066] In this case, a portion of the random orientation region that covers the first main surface-side surface 23a of the flange portion 23 preferably has a thickness of 0.5 mm or more, and a portion of the random orientation region that covers the second main surface-side surface 23b of the flange portion 23 also preferably has a thickness of 0.5 mm or more. In such a configuration, in consideration of the condition that the volume content of the reinforcement fibers in a commonly-used fiber-reinforced resin is 20% or more and 60% or less, an appropriate number of reinforcement fibers 13 located to straddle the above-described boundary portion can be ensured, so that the strength of bonding between the plate portion 10 and the receiving portion 20 can be more reliably enhanced.

[0067] As described above, by the spike shoe sole part 5A according to the present embodiment, the spike shoe sole 3 including the same, and the spike shoe 1 including the same, it is possible to sufficiently ensure the strength of bonding between the plate portion 10 and the receiving portion 20 while the receiving portion 20 to which the cleat 30 is attached is provided by insert molding in the plate portion 10 made of a fiber-reinforced resin.

[0068] Figs. 5 and 6 each are a schematic diagram for illustrating a method of manufacturing the spike shoe sole part according to the present embodiment. The following describes the method of manufacturing the spike shoe sole part 5A according to the present embodiment with reference to Figs. 5 and 6.

[0069] As described above, the sole part 5A according to the present embodiment includes the plate portion 10 made of a fiber-reinforced resin, and the plate portion 10 includes the random orientation region in a portion straddling the overlapping region A and the non-overlapping region B. The sole part 5A having such a configuration can be manufactured, for example, through the following manufacturing process.

[0070] First, as shown in Fig. 5, a resin piece 10A as a raw material of the plate portion 10 is prepared. In the resin piece 10A, a plurality of reinforcement fibers 13 are contained inside the resin 12 as a base material. The plurality of reinforcement fibers 13 are oriented to extend in one direction. The resin piece 10A is produced by cutting a relatively large resin sheet into pieces of a prescribed size. This relatively large resin sheet contains relatively long reinforcement fibers therein. The required number of the resin pieces 10A for producing the plate portion 10 are prepared.

[0071] Then, as shown in Fig. 6, the plurality of prepared resin pieces 10A are arranged in their thickness directions and superimposed on one another so as to face in random directions in the direction intersecting with the thickness directions, to thereby prepare a collection of the resin pieces 10A. Then, the collection is cut to produce a resin plate 10B having a prescribed shape. In this case, for the sake of convenience, the figure shows the resin plate 10B having a substantially rectangular outer shape in a plan view. However, in practice, the resin plate 10B having an outer shape corresponding to the shape of the plate portion 10 to be manufactured is prepared.

[0072] Then, the resin plate 10B is placed in a mold in which a plurality of receiving portions 20 are set in advance, and then, press molding is performed with this mold. Thereby, the plate portion 10 including the random orientation region is molded, and the plurality of receiving portions 20 are integrated with the plate portion 10. Then, in the produced sole part 5A, the random orientation region is located in the above-mentioned portion straddling the overlapping region A and the non-overlapping region B.

[0073] In the case where the above-described manufacturing process has been performed, the entire plate portion 10 of the sole part 5A is formed as the random orientation region. In such a case, when the resin plate 10B is produced, a prescribed region of this resin plate 10B may be replaced with a resin piece (for example, a resin piece not containing reinforcement fibers, a resin piece containing a plurality of woven reinforcement fibers, and the like) different from the collection of the resin pieces 10A, or may be replaced, for example, with a larger resin piece containing a plurality of regularly oriented reinforcement fibers. This also makes it possible to manufacture a sole part in which the random orientation region is included only in a part of the plate portion 10. Also in that case, however, in order to obtain sufficient strength of bonding between the plate portion 10 and the receiving portion 20, a random orientation region needs to be provided in the above-mentioned portion straddling the overlapping region A and the non-overlapping region B.

[0074] Further, according to the above-described method of manufacturing the spike shoe sole part 5A, the spike shoe sole part 5A is manufactured by press molding, but the spike shoe sole part 5A can also be manufactured by autoclave molding.

[0075] In this case, the above-described method of manufacturing the spike shoe sole part 5A is an example by which the random orientation region as the reinforcement region is formed to straddle the overlapping region A and the non-overlapping region B, but the reinforcement region may be a non-random orientation region as described above.

[0076] The following describes an example of the method of manufacturing a spike shoe sole part in the above-described case. Specifically, a fiber-reinforced resin plate containing reinforcement fibers oriented in one direction or in a plurality of directions is prepared in advance. Then, a hole is bored in a portion of this fiber-reinforced resin plate in which a receiving portion is embedded, and the receiving portion is fitted in this portion. In this state, the fiber-reinforced resin plate is press-molded or autoclave-molded, so that a spike shoe sole part is manufactured. In this case, the portion in which the reinforcement fibers are oriented in one direction or a plurality of directions is disposed in a portion of the fiber-reinforced resin plate that is to be formed as a boundary portion between the overlapping region A and the non-overlapping region B after molding, with the result that the non-random orientation region is formed to straddle the overlapping region A and the non-overlapping region B.<Second Embodiment>

[0077] Fig. 7(A) is a schematic cross-sectional view of a main part of a spike shoe sole part according to the second embodiment, and Fig. 7(B) is a bottom view of the main part. The following describes a spike shoe sole part 5B according to the present embodiment with reference to Figs. 7(A) and 7(B). Instead of the spike shoe sole part 5A according to the above-described first embodiment, the spike shoe sole part 5B according to the present embodiment is provided in the spike shoe sole 3 and the spike shoe 1.

[0078] As shown in Fig. 7(A), the sole part 5B according to the present embodiment is different from the sole part 5A according to the above-described first embodiment only in the shape of the plate portion 10.

[0079] Specifically, in the sole part 5B, the portion of the first main surface 10a that is located in the thick portion 14 of the plate portion 10 is inclined toward the second main surface 10b away from the cylindrical portion 21. Thereby, the thick portion 14 is configured to be significantly reduced in thickness at a position closer to the cylindrical portion 21 as compared with the thickness of the sole part 5A according to the above-described first embodiment. Accordingly, the thin portion 15 is also configured to be thinner than that in the spike shoe sole part 5A according to the above-described first embodiment.

[0080] Such a configuration also achieves the effect similar to that described in the above-described first embodiment. Thus, not only the strength of bonding between the plate portion 10 and the receiving portion 20 can be sufficiently ensured while the receiving portion 20 to which the cleat 30 is attached is provided by insert molding in the plate portion 10 made of a fiber-reinforced resin, but the sole part 5B according to the present embodiment can also be reduced more in weight than the sole part 5A according to the first embodiment by the reduced thickness of each of the thick portion 14 and the thin portion 15.

[0081] Further, as shown in Fig. 7(B), in the sole part 5B according to the present embodiment, the first curved surface 16 included in the portion of the first main surface 10a that is located in the thick portion 14 and the second curved surface 17 included in the portion of the second main surface 10b that is located in the thick portion 14 are configured such that their curvatures are changed with distance from the cylindrical portion 21. Further, it is assumed that a first maximum curvature position 16a represents a position on the first curved surface 16 at which the first curved surface 16 has a maximum curvature (see Fig. 7(A)); a second maximum curvature position 17a represents a position on the second curved surface 17 at which the second curved surface 17 has a maximum curvature (see Fig. 7(A)); a first imaginary line 16b represents a line connecting these first maximum curvature positions 16a; and a second imaginary line 17b represents a line connecting these second maximum curvature positions 17a. In this case, the sole part 5B according to the present embodiment is configured such that the first imaginary line 16b and the second imaginary line 17b do not overlap each other when viewed in the direction parallel to the axial direction of the hollow portion 24 (i.e., in the extending direction of the axial line AX shown in the figure).

[0082] Such a configuration makes it possible to avoid a configuration in which the first maximum curvature position 16a and the second maximum curvature position 17a, each of which may be structurally more fragile than their surroundings, are arranged close to each other. Thus, it becomes possible to suppress damage or the like in the thick portion 14 including the first maximum curvature position 16a and the second maximum curvature position 17a. Therefore, the strength of the entire sole part 5B can be enhanced, so that the sole part 5B can be excellent in durability.<First Modification>

[0083] Fig. 8 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the first modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B1 according to the first modification with reference to Fig. 8.

[0084] As shown in Fig. 8, the sole part 5B1 according to the first modification is different from the sole part 5B according to the above-described second embodiment in the shape of the flange portion 23.

[0085] Specifically, the flange portion 23 extends outward from the outer peripheral surface of the cylindrical portion so as to intersect with an imaginary plane orthogonal to the axial direction of the hollow portion 24. More specifically, the flange portion 23 extends to be curved toward the first main surface 10a away from the cylindrical portion 21.

[0086] Such a configuration not only achieves an effect similar to that described in the above-described second embodiment but also achieves what is called an anchor effect since the curved flange portion 23 is covered with the plate portion 10. Thereby, the strength of bonding between the plate portion 10 and the receiving portion 20 is further enhanced.<Second Modification>

[0087] Fig. 9 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the second modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B2 according to the second modification with reference to Fig. 9.

[0088] As shown in Fig. 9, the sole part 5B2 according to the second modification is different from the sole part 5B according to the above-described second embodiment in the shape of the flange portion 23.

[0089] Specifically, the flange portion 23 extends outward from the outer peripheral surface of the cylindrical portion so as to intersect with an imaginary plane orthogonal to the axial direction of the hollow portion 24. More specifically, the flange portion 23 extends to be inclined in a wedge shape toward the first main surface 10a away from the cylindrical portion 21.

[0090] Such a configuration not only achieves an effect similar to that described in the above-described second embodiment but also achieves what is called an anchor effect since the flange portion 23 inclined in a wedge shape is covered with the plate portion 10. Accordingly, the strength of bonding between the plate portion 10 and the receiving portion 20 is further enhanced.<Third Modification>

[0091] Fig. 10 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the third modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B3 according to the third modification with reference to Fig. 10.

[0092] As shown in Fig. 10, the sole part 5B3 according to the third modification is different from the sole part 5B2 according to the above-described second modification only in the range of the random orientation region provided in the plate portion 10.

[0093] Specifically, in the sole part 5B3, the reinforcement fiber 13 is not located in a portion of the plate portion 10 that covers the surface 22a of the bottom portion 22 of the receiving portion 20 on the side of the second main surface 10b.

[0094] Such a configuration also achieves an effect similar to that described in the second embodiment and the second modification.<Fourth Modification>

[0095] Fig. 11 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the fourth modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B4 according to the fourth modification with reference to Fig. 11.

[0096] As shown in Fig. 11, the sole part 5B4 according to the fourth modification is different from the sole part 5B2 according to the above-described second modification only in the range of the random orientation region provided in the plate portion 10.

[0097] Specifically, in the sole part 5B4, the reinforcement fiber 13 is not located in a portion of the plate portion 10 that covers the second main surface-side surface 23b of the flange portion 23 of the receiving portion 20.

[0098] Such a configuration also achieves an effect similar to that described in the second embodiment and the second modification.<Fifth Modification>

[0099] Fig. 12 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the fifth modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B5 according to the fifth modification with reference to Fig. 12.

[0100] As shown in Fig. 12, the sole part 5B5 according to the fifth modification is different from the sole part 5B2 according to the above-described second modification only in the range of the random orientation region provided in the plate portion 10.

[0101] Specifically, in the sole part SBS, the reinforcement fiber 13 is not located in a portion of the plate portion 10 that covers the first main surface-side surface 23a of the flange portion 23 of the receiving portion 20.

[0102] Such a configuration also achieves an effect similar to that described in the second embodiment and the second modification.<Sixth Modification>

[0103] Fig. 13 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the sixth modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B6 according to the sixth modification with reference to Fig. 13.

[0104] As shown in Fig. 13, the sole part 5B6 according to the sixth modification is different from the sole part 5B2 according to the above-described second modification in the shape of the plate portion 10.

[0105] Specifically, in the sole part 5B6, the plate portion 10 does not cover the surface 22a of the bottom portion 22 of the receiving portion 20 on the side of the second main surface 10b, and the surface 22a is exposed to the outside.

[0106] Such a configuration also achieves an effect similar to that described in the second embodiment and the second modification. Further, the sole part 5B6 is reduced in weight by an amount by which the area including the plate portion 10 is reduced.<Seventh Modification>

[0107] Fig. 14 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the seventh modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B7 according to the seventh modification with reference to Fig. 14.

[0108] As shown in Fig. 14, the sole part 5B7 according to the seventh modification is different from the sole part 5B2 according to the above-described second modification in the shape of the receiving portion 20.

[0109] Specifically, in the sole part 5B7, the receiving portion 20 does not have the bottom portion 22, the receiving portion 20 is opened at the end portion of the hollow portion 24 on the side of the second main surface 10b in the axial direction of the hollow portion 24, and the plate portion 10 covers the opened end portion of the receiving portion 20 on the side of the second main surface 10b.

[0110] Such a configuration also achieves an effect similar to that described in the second embodiment and the second modification. Further, the sole part 5B7 is reduced in weight by an amount by which the bottom portion 22 is not provided in the receiving portion 20.<Eighth Modification>

[0111] Fig. 15 is a schematic cross-sectional view of a main part of a spike shoe sole part according to the eighth modification based on the above-described second embodiment. The following describes a spike shoe sole part 5B8 according to the eighth modification with reference to Fig. 15.

[0112] As shown in Fig. 15, the sole part 5B8 according to the eighth modification is different from the sole part 5B2 according to the above-described second modification in the shapes of the plate portion 10 and the receiving portion 20.

[0113] Specifically, in the sole part 5B8, the receiving portion 20 does not have the bottom portion 22, the receiving portion 20 is opened at the end portion of the hollow portion 24 on the side of the second main surface 10b in the axial direction of the hollow portion 24, and the plate portion 10 does not cover the opened end portion of the receiving portion 20 on the side of the second main surface 10b.

[0114] Such a configuration also achieves an effect similar to that described in the second embodiment and the second modification. Further, the sole part 5B8 is reduced in weight by an amount by which the bottom portion 22 is not provided in the receiving portion 20 and by an amount by which the area including the plate portion 10 is reduced.<Third Embodiment>

[0115] Fig. 16 is a bottom view of a spike shoe according to the third embodiment. The following describes a spike shoe sole part 5C according to the present embodiment with reference to Fig. 16. Instead of the spike shoe sole part 5A according to the above-described first embodiment, the spike shoe sole part 5C according to the present embodiment is provided in the spike shoe sole 3 and the spike shoe 1.

[0116] As shown in Fig. 16, the sole part 5C according to the present embodiment is different from the sole part 5A according to the above-described first embodiment only in the shape of the plate portion 10.

[0117] Specifically, the sole part 5C is not provided with the plurality of protrusions 18 (see Figs. 1 to 3) included in the sole part 5A according to the above-described first embodiment, but instead is provided with a plurality of ridges 19 on the first main surface 10a of the plate portion 10. The plurality of ridges 19 each are provided between a pair of adjacent receiving portions 20 (i.e., between the receiving portions 20A and 20B, and between the receiving portions 20C and 20D) among the plurality of receiving portions 20 to thereby contiguously connect a corresponding pair of adjacent receiving portions. In other words, the plurality of ridges 19 correspond to ribs that each contiguously connect a pair of adjacent receiving portions 20, and function to reinforce the portion of the plate portion 10 that is located between the pair of receiving portions 20.

[0118] Such a configuration also achieves an effect similar to that described in the above-described first embodiment. Thus, the strength of bonding between the plate portion 10 and the receiving portion 20 can be sufficiently ensured while the receiving portion 20 to which the cleat 30 is attached is provided by insert molding in the plate portion 10 made of a fiber-reinforced resin.<Summary of the Disclosure in Embodiments>

[0119] The following summarizes the features disclosed in the above-described embodiments and modifications thereof.[Supplementary Note 1]

[0120] A spike shoe sole part comprising: a plate portion having a first main surface and a second main surface located opposite to the first main surface; and a receiving portion to which a cleat is detachably attachable, the receiving portion being partially embedded in the plate portion, wherein the receiving portion is formed of a metal member including a cylindrical portion in which a cleat is received and held, and a flange portion protruding outward from an outer peripheral surface of the cylindrical portion, the plate portion is formed of a molded component made of a fiber-reinforced resin and including at least a reinforcement region in which reinforcement fibers are contained in a resin as a base material, the receiving portion is embedded in the plate portion in a state in which an end portion of a hollow portion as a space inside the cylindrical portion on a side of the first main surface in an axial direction of the hollow portion is exposed to outside such that the cleat is attachable and detachable on the side of the first main surface, when viewed in a direction parallel to the axial direction of the hollow portion, the plate portion includes an overlapping region overlapping the receiving portion, and a non-overlapping region not overlapping the receiving portion, the reinforcement region is located to straddle at least the overlapping region and the non-overlapping region, a portion of the reinforcement region that is located in the overlapping region is fixed to a surface of the flange portion on the side of the first main surface, a surface of the flange portion on a side of the second main surface, and an outer peripheral surface of the cylindrical portion, and an average length of the reinforcement fibers contained in a portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region is longer than a protrusion length of the flange portion protruding from the cylindrical portion. [Supplementary Note 2]

[0121] The spike shoe sole part according to Supplementary Note 1, wherein a condition of 1.08 ≤ L / D is further satisfied, where L represents the average length of the reinforcement fibers contained in the portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region, and D represents the protrusion length of the flange portion protruding from the cylindrical portion. [Supplementary Note 3]

[0122] The spike shoe sole part according to Supplementary Note 1 or 2, wherein a condition of 1 < L / (D + H) is further satisfied, where L represents the average length of the reinforcement fibers contained in the portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region, D represents the protrusion length of the flange portion protruding from the cylindrical portion, and H represents a distance between a portion of the surface of the flange portion on the side of the first main surface, the portion of the surface of the flange portion being connected to the cylindrical portion, and an axial end surface of the cylindrical portion on the side of the first main surface. [Supplementary Note 4]

[0123] The spike shoe sole part according to any one of Supplementary Notes 1 to 3, wherein the reinforcement region is formed of a random orientation region in which reinforcement fibers are randomly oriented in a resin as a base material.[Supplementary Note 5]

[0124] The spike shoe sole part according to any one of Supplementary Notes 1 to 4, wherein a portion of the reinforcement region that covers a surface of the flange portion on the side of the first main surface has a thickness of 0.5 mm or more, and a portion of the reinforcement region that covers a surface of the flange portion on the side of the second main surface has a thickness of 0.5 mm or more. [Supplementary Note 6]

[0125] The spike shoe sole part according to any one of Supplementary Notes 1 to 5, wherein the flange portion extends outward from the outer peripheral surface of the cylindrical portion to intersect with an imaginary plane orthogonal to the axial direction of the hollow portion.[Supplementary Note 7]

[0126] The spike shoe sole part according to Supplementary Note 6, wherein the flange portion extends toward the first main surface away from the cylindrical portion.[Supplementary Note 8]

[0127] The spike shoe sole part according to any one of Supplementary Notes 1 to 7, wherein the flange portion has an annular plate shape surrounding the cylindrical portion in a circumferential direction of the cylindrical portion.[Supplementary Note 9]

[0128] The spike shoe sole part according to any one of Supplementary Notes 1 to 8, wherein an axial end surface of the cylindrical portion on the side of the first main surface is exposed to outside, and a portion of the first main surface that is adjacent to the cylindrical portion is contiguous to the axial end surface. [Supplementary Note 10]

[0129] The spike shoe sole part according to any one of Supplementary Notes 1 to 9, wherein the receiving portion further has a bottom portion that closes an end portion of the hollow portion on the side of the second main surface in the axial direction of the hollow portion.[Supplementary Note 11]

[0130] The spike shoe sole part according to Supplementary Note 10, wherein a portion of the random orientation region that is located in the overlapping region is fixed to a surface of the bottom portion on the side of the second main surface.[Supplementary Note 12]

[0131] The spike shoe sole part according to any one of Supplementary Notes 1 to 11, wherein the plate portion includes a thick portion located outside the cylindrical portion and close to the cylindrical portion, and a thin portion located outside the thick portion, a portion of first main surface that is located in the thick portion includes a first curved surface extending toward the second main surface away from the cylindrical portion to smoothly connect to a portion of the first main surface that is located in the thin portion, and a portion of the second main surface that is located in the thick portion includes a second curved surface extending toward the first main surface away from the cylindrical portion to smoothly connect to a portion of the second main surface that is located in the thin portion. [Supplementary Note 13]

[0132] The spike shoe sole part according to Supplementary Note 12, wherein each of the first curved surface and the second curved surface is configured to be changed in curvature with distance from the cylindrical portion, and a first imaginary line and a second imaginary line do not overlap each other when viewed in the direction parallel to the axial direction of the hollow portion, the first imaginary line being formed by connecting positions on the first curved surface at which the first curved surface has a maximum curvature, and the second imaginary line being formed by connecting positions on the second curved surface at which the second curved surface has a maximum curvature. [Supplementary Note 14]

[0133] The spike shoe sole part according to any one of Supplementary Notes 1 to 13, wherein the receiving portion includes a first receiving portion and a second receiving portion that are spaced apart from each other at different positions on the plate portion, and a rib contiguously or intermittently connecting the first receiving portion and the second receiving portion is provided on a portion of the plate portion that is located between the first receiving portion and the second receiving portion. [Supplementary Note 15]

[0134] The spike shoe sole part according to Supplementary Note 14, wherein the rib is provided on the first main surface.[Supplementary Note 16]

[0135] The spike shoe sole part according to any one of Supplementary Notes 1 to 15, wherein the reinforcement fibers contained in a portion of the random orientation region that is located to straddle the overlapping region and the non-overlapping region are carbon fibers.[Supplementary Note 17]

[0136] A spike shoe sole comprising the spike shoe sole part according to any one of Supplementary Notes 1 to 16.[Supplementary Note 18]

[0137] A spike shoe comprising: the spike shoe sole according to Supplementary Note 17; and an upper provided above the spike shoe sole. [Supplementary Note 19]

[0138] The spike shoe according to Supplementary Note 18, wherein a cleat is attached to the receiving portion.<Other Embodiments>

[0139] The embodiments and the modifications thereof have been described above with reference to an example in which the flange portion provided in the receiving portion is configured to have a shape surrounding the cylindrical portion in its circumferential direction, but the flange portion does not necessarily have to be provided to surround the cylindrical portion, and a plurality of flange portions may be provided in dotted lines so as to be intermittently arranged in the circumferential direction of the cylindrical portion.

[0140] Further, the embodiments and the modifications thereof have been described above with reference to an example in which the flange portion provided in the receiving portion is provided so as to stand upright from the cylindrical portion or is provided so as to extend toward the first main surface away from the cylindrical portion, but the flange portion may be provided so as to extend toward the second main surface away from the cylindrical portion.

[0141] Further, the embodiments and the modifications thereof have been described above with reference to an example in which the ribs are provided to contiguously or intermittently connect the pair of adjacent receiving portions on the first main surface of the plate portion, but the ribs are not necessarily indispensable and may not be provided.

[0142] Further, the embodiments and the modifications thereof have been described above with reference to an example in which the sole part is formed to be thinner than the midsole, but the sole part may be formed to be equal in thickness to the midsole, or the sole part may be formed to be thicker than the midsole.

[0143] Further, the embodiments and the modifications thereof have been described above with reference to an example in which all the receiving portions included in the sole part are configured to have the same shape, but all the receiving portions included in the sole part do not necessarily have to have the same shape, and may be formed to be partially different in shape from one another.

[0144] Various configurations disclosed in the above-described embodiments and modifications thereof can be modified as appropriate without departing from the gist of the present disclosure. For example, the number of receiving portions provided in the spike shoe sole part is not limited to four, but may be more than four or may be less than four. Further, in the above description of an exemplary configuration, the cleat is attached to the receiving portion by screwing, but the cleat may be attached to the receiving portion by another attachment method.

[0145] Further, the characteristic configurations disclosed in the above-described embodiments and modifications thereof can be combined with each other without departing from the gist of the present disclosure.

[0146] Thus, the above-described embodiments disclosed herein are illustrative and non-restrictive in every respect. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the meaning and scope equivalent to the terms of the claims.REFERENCE SIGNS LIST

[0147] 1 spike shoe, 2 upper, 3 spike shoe sole, 3a ground contact surface, 4 midsole, 5A to 5C, 5B1 to 5B8 spike shoe sole part, 6A medial foot-side outsole, 6B lateral foot-side outsole, 10 plate portion, 10A resin piece, 10B resin plate, 10a first main surface, 10b second main surface, 11 opening, 12 resin, 13 reinforcement fiber, 14 thick portion, 15 thin portion, 16 first curved surface, 16a first maximum curvature position, 16b first imaginary line, 17 second curved surface, 17a second maximum curvature position, 17b second imaginary line, 18 protrusion, 19 ridge, 20, 20A to 20D receiving portion, 20a female thread portion, 21 cylindrical portion, 21a outer peripheral surface, 21b axial end surface, 22 bottom portion, 22a surface, 23 flange portion, 23a first main surface-side surface, 23b second main surface-side surface, 24 hollow portion, 30 cleat, 30a male thread portion, A overlapping region, B non-overlapping region, HC heel center, R1 forefoot portion, R2 midfoot portion, R3 rearfoot portion, SC shoe center.

Claims

1. A spike shoe sole part comprising: a plate portion having a first main surface and a second main surface located opposite to the first main surface; and a receiving portion to which a cleat is detachably attachable, the receiving portion being partially embedded in the plate portion, wherein the receiving portion is formed of a metal member including a cylindrical portion in which a cleat is received and held, and a flange portion protruding outward from an outer peripheral surface of the cylindrical portion, the plate portion is formed of a molded component made of a fiber-reinforced resin and including at least a reinforcement region in which reinforcement fibers are contained in a resin as a base material, the receiving portion is embedded in the plate portion in a state in which an end portion of a hollow portion as a space inside the cylindrical portion on a side of the first main surface in an axial direction of the hollow portion is exposed to outside such that the cleat is attachable and detachable on the side of the first main surface, when viewed in a direction parallel to the axial direction of the hollow portion, the plate portion includes an overlapping region overlapping the receiving portion, and a non-overlapping region not overlapping the receiving portion, the reinforcement region is located to straddle at least the overlapping region and the non-overlapping region, a portion of the reinforcement region that is located in the overlapping region is fixed to a surface of the flange portion on the side of the first main surface, a surface of the flange portion on a side of the second main surface, and an outer peripheral surface of the cylindrical portion, and an average length of the reinforcement fibers contained in a portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region is longer than a protrusion length of the flange portion protruding from the cylindrical portion.

2. The spike shoe sole part according to claim 1, wherein a condition of 1.08 ≤ L / D is further satisfied, where L represents the average length of the reinforcement fibers contained in the portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region, and D represents the protrusion length of the flange portion protruding from the cylindrical portion.

3. The spike shoe sole part according to claim 1, wherein a condition of 1 < L / (D + H) is further satisfied, where L represents the average length of the reinforcement fibers contained in the portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region, D represents the protrusion length of the flange portion protruding from the cylindrical portion, and H represents a distance between a portion of the surface of the flange portion on the side of the first main surface, the portion of the surface of the flange portion being connected to the cylindrical portion, and an axial end surface of the cylindrical portion on the side of the first main surface.

4. The spike shoe sole part according to claim 1, wherein the reinforcement region is formed of a random orientation region in which reinforcement fibers are randomly oriented in a resin as a base material.

5. The spike shoe sole part according to claim 1, wherein a portion of the reinforcement region that covers a surface of the flange portion on the side of the first main surface has a thickness of 0.5 mm or more, and a portion of the reinforcement region that covers a surface of the flange portion on the side of the second main surface has a thickness of 0.5 mm or more.

6. The spike shoe sole part according to claim 1, wherein the flange portion extends outward from the outer peripheral surface of the cylindrical portion to intersect with an imaginary plane orthogonal to the axial direction of the hollow portion.

7. The spike shoe sole part according to claim 6, wherein the flange portion extends toward the first main surface away from the cylindrical portion.

8. The spike shoe sole part according to claim 1, wherein the flange portion has an annular plate shape surrounding the cylindrical portion in a circumferential direction of the cylindrical portion.

9. The spike shoe sole part according to claim 1, wherein an axial end surface of the cylindrical portion on the side of the first main surface is exposed to outside, and a portion of the first main surface that is adjacent to the cylindrical portion is contiguous to the axial end surface.

10. The spike shoe sole part according to claim 1, wherein the receiving portion further has a bottom portion that closes an end portion of the hollow portion on the side of the second main surface in the axial direction of the hollow portion.

11. The spike shoe sole part according to claim 10, wherein a portion of the reinforcement region that is located in the overlapping region is fixed to a surface of the bottom portion on the side of the second main surface.

12. The spike shoe sole part according to claim 1, wherein the plate portion includes a thick portion located outside the cylindrical portion and close to the cylindrical portion, and a thin portion located outside the thick portion, a portion of first main surface that is located in the thick portion includes a first curved surface extending toward the second main surface away from the cylindrical portion to smoothly connect to a portion of the first main surface that is located in the thin portion, and a portion of the second main surface that is located in the thick portion includes a second curved surface extending toward the first main surface away from the cylindrical portion to smoothly connect to a portion of the second main surface that is located in the thin portion.

13. The spike shoe sole part according to claim 12, wherein each of the first curved surface and the second curved surface is configured to be changed in curvature with distance from the cylindrical portion, and a first imaginary line and a second imaginary line do not overlap each other when viewed in the direction parallel to the axial direction of the hollow portion, the first imaginary line being formed by connecting positions on the first curved surface at which the first curved surface has a maximum curvature, and the second imaginary line being formed by connecting positions on the second curved surface at which the second curved surface has a maximum curvature.

14. The spike shoe sole part according to claim 1, wherein the receiving portion includes a first receiving portion and a second receiving portion that are spaced apart from each other at different positions on the plate portion, and a rib contiguously or intermittently connecting the first receiving portion and the second receiving portion is provided on a portion of the plate portion that is located between the first receiving portion and the second receiving portion.

15. The spike shoe sole part according to claim 14, wherein the rib is provided on the first main surface.

16. The spike shoe sole part according to claim 1, wherein the reinforcement fibers contained in the portion of the reinforcement region that is located to straddle the overlapping region and the non-overlapping region are carbon fibers.

17. A spike shoe sole comprising the spike shoe sole part according to any one of claims 1 to 16.

18. A spike shoe comprising: the spike shoe sole according to claim 17; and an upper provided above the spike shoe sole.

19. The spike shoe according to claim 18, wherein a cleat is attached to the receiving portion.

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