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

Abstract

To provide a sole part for a spike shoe capable of sufficiently securing the bond strength between a metallic seat for attaching cleats and a fiber-reinforced resin plate.SOLUTION: A sole part 5A for a spike shoe comprises: a fiber-reinforced resin plate 10 including a reinforced area being an area including reinforced fiber 12; and a metallic seat 20 to which a cleat 30 is attachable. The seat 20 includes a tube 21 and a flange 23 and is embedded in the plate 10. The plate 10 includes an overlapping area A overlapping with the seat 20 and a non-overlapping area B not overlapping with the seat 20, and the reinforced area is positioned across the overlapping area A and the non-overlapping area B. The reinforced area is fastened to the surface of the flange 23 and the outer peripheral surface of the tube 21, and the average length L of the reinforced fiber 12 included in the reinforced area is longer than the projection length D of the flange 23.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to sole parts for spiked shoes (hereinafter sometimes simply referred to as "sole parts") to which cleats can be removably attached, a sole for spiked shoes (hereinafter sometimes simply referred to as "sole"), and spiked shoes. [Background technology]

[0002] Conventionally, there are two types of spike shoes with protrusions on the ground surface: one in which the protrusions are integrally and irreplaceably attached to the sole, and one in which the protrusions are detachably attached to the sole. In the latter type of spike shoes, the protrusions are also called cleats, and the sole is provided with a seat for holding the cleats.

[0003] Typically, cleats are often made of metal members, and the seats that hold the cleats are also often made of metal members. On the other hand, soles are often made of non-metallic members such as resin or rubber, and so the metal seats are generally embedded in the non-metallic sole. Examples of documents disclosing spike shoes with seats embedded in the sole include JP 2000-166614 A (Patent Document 1). From the standpoint of facilitating production and increasing the fixing strength, it is preferable that the seats be embedded in the sole by so-called insert molding.

[0004] Meanwhile, in recent years, shoes have become popular that have a high-rigidity plate made of fiber-reinforced resin in the sole to suppress dorsiflexion that occurs in the sole, particularly when running, thereby increasing forward propulsion force when pushing off. For example, JP2018-529461A (Patent Document 2) is an example of a document that discloses shoes with this type of sole. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-166614 A [Patent Document 2] Special Publication No. 2018-529461 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, when it is assumed that spike shoes are equipped with the high-rigidity plate made of the above-mentioned fiber-reinforced resin, it is conceivable that the seat portion is embedded in the high-rigidity plate by insert molding.

[0007] However, fiber-reinforced resin is not easy to mold, unlike general resins used in insert molding. Moreover, from the viewpoint of weight reduction and performance, the high-rigidity plate made of fiber-reinforced resin needs to be relatively thin, whereas the height of the above-mentioned seat portion is significantly greater than the thickness of the relatively thin high-rigidity plate made of fiber-reinforced resin.

[0008] For these reasons, it is extremely difficult to integrate the seat part with the high-rigidity fiber-reinforced resin plate by insert molding while satisfying the required performance such as durability and weight reduction. In particular, in order to increase durability, it is important to ensure sufficient bonding strength between the high-rigidity fiber-reinforced resin plate and the seat part, and it is essential to implement some kind of ingenuity in this regard.

[0009] Therefore, the present disclosure has been made in consideration of the above-mentioned problems, and makes it possible to provide sole parts for spike shoes, soles for spike shoes, and spike shoes that can provide a seat for attaching cleats by insert molding in a plate portion made of fiber-reinforced resin, while still ensuring sufficient bonding strength between the plate portion and the seat. [Means for solving the problem]

[0010] The sole part for spike shoes according to the present disclosure includes a plate portion and a seat portion. The plate portion has a first main surface and a second main surface located on the opposite side to the first main surface. The seat portion is capable of detachably mounting cleats, and a part of the seat portion is embedded in the plate portion. The seat portion is made of a metal member including a cylindrical portion for receiving and holding the cleats and a flange portion protruding outward from the outer circumferential surface of the cylindrical portion. The plate portion is made of a molded product made of fiber-reinforced resin including at least a reinforced region in which reinforced fibers are contained in a resin as a base material. The seat portion is embedded in the plate portion with an end portion on the first main surface side in the axial direction of a hollow portion, which is a space inside the cylindrical portion, exposed to the outside so that cleats can be attached and detached on the first main surface side. When viewed along a direction parallel to the axial direction of the hollow portion, the plate portion includes an overlapping region that is a region that overlaps the seat portion and a non-overlapping region that is a region that does not overlap the seat portion. The reinforced region is located across at least the overlap region and the non-overlapping region. The reinforced region in the overlap region is fixed to the first main surface side surface of the flange, the second main surface side surface of the flange, and the outer circumferential surface of the cylindrical portion. The average length of the reinforced fibers included in the reinforced region in the overlap region and the non-overlapping region is longer than the length of the flange protruding from the cylindrical portion.

[0011] A sole for spiked shoes based on the present disclosure includes the above-described sole part for spiked shoes based on the present disclosure.

[0012] A spike shoe according to the present disclosure includes the spike shoe sole according to the present disclosure described above, and an upper provided above the spike shoe sole. Effect of the Invention

[0013] According to the present disclosure, it is possible to provide sole parts for spike shoes, soles for spike shoes, and spike shoes in which a seat for attaching cleats is provided in a fiber-reinforced resin plate portion by insert molding, while still ensuring sufficient bonding strength between the plate portion and the seat. [Brief description of the drawings]

[0014] [Figure 1] 1 is a side view of a spike shoe according to a first embodiment, seen from the outside of the foot. [Diagram 2] FIG. 2 is a bottom view of the spike shoe shown in FIG. [Diagram 3] FIG. 2 is a bottom view of the sole part for spiked shoes according to the first embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line IV-IV shown in FIG. [Diagram 5] 3A to 3C are schematic diagrams for illustrating a method for manufacturing a sole part for spiked shoes according to the first embodiment. [Figure 6] 3A to 3C are schematic diagrams for illustrating a method for manufacturing a sole part for spiked shoes according to the first embodiment. [Figure 7] 11A and 11B are schematic cross-sectional and bottom views of a main part of a sole part for spiked shoes according to a second embodiment. [Figure 8] FIG. 4 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a first modified example. [Figure 9] FIG. 11 is a schematic cross-sectional view of a main portion of a sole part for spiked shoes according to a second modified example. [Figure 10] FIG. 11 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a third modified example. [Figure 11] FIG. 13 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a fourth modified example. [Figure 12] FIG. 13 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a fifth modified example. [Figure 13] FIG. 13 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a sixth modified example. [Figure 14] FIG. 13 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a seventh modified example. [Figure 15] FIG. 13 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to an eighth modified example. [Figure 16] FIG. 11 is a bottom view of the spike shoe according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference characters in the drawings, and the description thereof will not be repeated.

[0016] <Embodiment 1> Fig. 1 is a side view of a spike shoe according to a first embodiment as viewed from the outside of the foot, and Fig. 2 is a bottom view of the spike shoe shown in Fig. 1. Fig. 3 is a bottom view of the spike shoe sole part shown in Figs. 1 and 2, and Fig. 4 is a schematic cross-sectional view taken along line IV-IV shown in Fig. 3. First, the configurations of a spike shoe 1, a spike shoe sole 3, and a spike shoe sole part 5A according to this embodiment will be described with reference to Figs. 1 to 4.

[0017] As shown in Figs. 1 and 2, spike shoes 1 include an upper 2 and a sole 3. The sole 3 is a member that supports the sole of the wearer's foot and has a generally flat shape. The sole 3 has a ground contact surface 3a on its underside that touches the ground when the sole 3 is used, such as when walking or running. The upper 2 is a member that receives and holds the wearer's foot and has a shape that covers almost the entire part of the wearer's foot distal to the ankle when inserted. The upper 2 is located above the sole 3. The upper 2 and the sole 3 are joined together, for example, by adhesion or the like.

[0018] The sole 3 is divided along the front-to-rear direction (left-to-right direction in FIG. 1, up-to-down direction in FIG. 2), which is a direction that coincides with the length direction of the wearer's foot when viewed in a plane, into a forefoot portion R1 that supports the toes and forefoot area of ​​the wearer's foot, a midfoot portion R2 that supports the arch of the wearer's foot, and a rear foot portion R3 that supports the heel of the wearer's foot.

[0019] Here, if the front end of the sole 3 is taken as a reference point, a position corresponding to 40% of the front-to-back dimension of the sole 3 from the front end is taken as the first boundary position, and a position corresponding to 70% of the front-to-back dimension of the sole 3 from the front end is taken as the second boundary position, then the forefoot portion R1 corresponds to the portion between the front end of the sole 3 and the first boundary position along the front-to-back direction, the midfoot portion R2 corresponds to the portion between the first boundary position and the second boundary position along the front-to-back direction, and the rear foot portion R3 corresponds to the portion between the second boundary position and the rear end of the sole 3 along the front-to-back direction.

[0020] As shown in FIG. 2, the sole 3 is divided along the left-right direction (left-right direction in the figure), which is the direction that corresponds to the width direction of the wearer's foot when viewed in a plane, into an inner foot part (the S1 side part shown in the figure), which is the midline side (i.e. the side closer to the midline) of the anatomical orthogonal position of the foot, and an outer foot part (the S2 side part shown in the figure), which is the opposite side of the midline side of the anatomical orthogonal position of the foot (i.e. the side farther from the midline).

[0021] Here, the boundary line dividing the sole 3 into an inner part and an outer part is the so-called shoe center SC. This shoe center SC is a straight line obtained by projecting a straight line connecting the part between the first and second toes of a standard wearer having a foot size suitable for the spike shoes 1 and the center part of the calcaneus (the so-called heel center (the heel center is indicated by the symbol HC in Fig. 2 and other figures)) in the up-down direction onto the sole 3 when the spike shoes 1 are worn by such a standard wearer. The front end and rear end of the sole 3 described above are the ends of the sole 3 located on this shoe center SC.

[0022] As shown in Figures 1 and 2, the sole 3 mainly includes a midsole 4, a sole part 5A, an inner foot side outsole 6A, and an outer foot side outsole 6B. The midsole 4 defines the upper surface of the sole 3 to which the upper 2 is attached, and is configured to be relatively thick. The sole part 5A is configured to be thinner than the midsole 4, and is attached to the midsole 4 so as to cover a part of the lower surface of the midsole 4. The inner foot side outsole 6A and the outer foot side outsole 6B are attached to the midsole 4 so as to cover predetermined positions of the lower surface of the midsole 4.

[0023] More specifically, in the spike shoes 1 according to the present embodiment, the sole parts 5A are exposed to the outside in the forefoot part R1 and the midfoot part R2, and in order to prevent the sole parts 5A from being exposed to the outside in the rearfoot part R3, the sole parts 5A except for their rear ends are attached to the underside of the midsole 4, and the rear ends of the sole parts 5A are embedded inside the midsole 4. The medial outsole 6A and the lateral outsole 6B are attached to the underside of the midsole 4 in the portions where the sole parts 5A are embedded.

[0024] As a result, the above-mentioned ground contact surface 3a of the sole 3 is mainly defined by the sole parts 5A in the forefoot part R1 and the midfoot part R2, and is mainly defined by the medial outsole 6A and the lateral outsole 6B in the rearfoot part R3. Note that, in the part of the underside of the sole 3 where the above-mentioned sole parts 5A, medial outsole 6A and lateral outsole 6B are not provided, the ground contact surface 3a is defined by the underside of the midsole 4 in the part exposed to the outside.

[0025] Here, the sole part 5A can be attached to the midsole 4, and the medial outsole 6A and lateral outsole 6B can be attached to the midsole 4 by, for example, adhesion or the like. A specific method for embedding the rear end of the sole part 5A inside the midsole 4 in the rear foot portion R3 can be achieved, for example, by dividing the midsole 4 into a plurality of members and sandwiching the rear end of the sole part 5A between the plurality of divided midsoles 4.

[0026] The sole part 5A does not necessarily have to be partially embedded in the midsole 4, and may be attached to the midsole 4 so as to cover almost the entire lower surface of the midsole 4. In that case, it is not necessarily required to provide the inner foot outsole 6A and the outer foot outsole 6B, and they may be omitted. In this embodiment, the outsole is configured with two members, the inner foot outsole 6A and the outer foot outsole 6B, but it may be configured with one member or three or more members.

[0027] It is preferable that the midsole 4 has a suitable strength and excellent cushioning properties, and from this viewpoint, for example, a resin foam material containing a resin material as a main component and a foaming agent and a crosslinking agent as subcomponents is used as the midsole 4. Alternatively, a rubber foam material containing a rubber material as a main component and a plasticizer, a foaming agent, a reinforcing agent, and a crosslinking agent as subcomponents may be used.

[0028] Examples of the resin material that can be used include ethylene-vinyl acetate copolymer (EVA), polyolefin resin, thermoplastic polyurethane, thermoplastic polyamide elastomer (TPA, TPAE), thermoplastic polyester elastomer, etc. Examples of the rubber material that can be used include butadiene rubber.

[0029] As a result, the midsole 4 is generally made of a soft material with a small elastic modulus, and therefore the midsole 4 elastically deforms relatively easily when subjected to a compressive load, resulting in excellent cushioning properties.

[0030] On the other hand, the sole part 5A is made of a composite part consisting of a plate portion 10 and a plurality of seat portions 20 as described later, and is made of a material having higher rigidity than the material constituting the midsole 4. The plate portion 10 which is the base of the sole part 5A is made of a fiber-reinforced resin. Examples of the reinforcing fibers include carbon fiber, glass fiber, cellulose fiber (including cellulose nanofiber), aramid fiber, Dyneema fiber, Zylon fiber, and boron fiber. On the other hand, the resin used as the base material may be a thermoplastic resin or a thermosetting resin, such as an epoxy resin, polyester resin, phenolic resin, polyamide resin, polypropylene resin, polyethylene resin, or polyurethane resin.

[0031] As a result, the sole part 5A is made of a hard material with a significantly high elastic modulus. Therefore, the sole part 5A is elastically deformed by receiving a high load when pushing off, and the restoring force generated in the sole part 5A due to this elastic deformation acts on the ground as a high repulsive force. Therefore, by providing the sole part 5A to the sole 3, it is possible to dramatically increase the forward propulsion force when pushing off.

[0032] Here, the effect of improving the forward propulsion force when pushing off using the above-mentioned rebound force is mainly exerted by the plate portion 10 of the sole part 5A. That is, the plate portion 10 of the sole part 5A functions as a so-called high-rigidity plate. In contrast, the multiple seat portions 20 combined with the plate portion 10 have the effect of increasing the propulsion force when pushing off by attaching the cleats 30 thereto, the details of which will be described later.

[0033] It is preferable that the inner outsole 6A and the outer outsole 6B have excellent wear resistance and gripping properties, and from this viewpoint, the inner outsole 6A and the outer outsole 6B are made of a hard resin or rubber material having a higher elastic modulus than the midsole 4.

[0034] 1 to 4, the sole part 5A is made of a generally plate-shaped member and includes a plate portion 10 and a plurality of seat portions 20. The plate portion 10 is a base portion of the sole part 5A, and each of the plurality of seat portions 20 is a portion that receives and holds a cleat 30. Here, the cleat 30 protrudes in a pin-like shape from the ground contact surface 3a of the sole 3 to increase the propulsive force when pushing off.

[0035] The plate portion 10 has a first main surface 10a located on the ground surface 3a side and a second main surface 10b (see Figure 4) located opposite the first main surface 10a, and each of the multiple seat portions 20 is embedded in the plate portion 10 so as to be exposed on the first main surface 10a side.

[0036] 2 and 3, the plate part 10 in the portion corresponding to the forefoot part R1 has an opening 11 extending in the front-rear direction at its center. As a result, in the forefoot part R1, the plate part 10 extends in a generally U-shape in plan view so as to follow the toe part, the inner foot part, and the outer foot part. In the midfoot part R2 and the rearfoot part R3, the plate part 10 is positioned across the inner foot part and the outer foot part.

[0037] The plurality of seats 20 include a total of four seats, specifically, a seat 20A located near the front end of the forefoot R1 and on the inner foot side, a seat 20B located near the rear end of the forefoot R1 and on the inner foot side, a seat 20C located near the front end of the forefoot R1 and on the outer foot side, and a seat 20D located near the rear end of the forefoot R1 and on the outer foot side. All of these four seats 20A to 20D have the same shape.

[0038] Here, the sole part 5A is a so-called insert molded product, and is a composite part in which the plate part 10 and the plurality of seats 20 are integrated. Specifically, the sole part 5A is produced by attaching the plate part 10 before molding so as to cover a part of the surface of each of the plurality of seats 20 when molding the plate part 10, and solidifying the plate part 10 while molding in this state. As a result, a part of each of the plurality of seats 20 is assembled to the plate part 10 in a state of being embedded in the plate part 10 as described above, and the plate part 10 is fixed to the surface of the seat part 20 at the boundary between the plate part 10 and each of the plurality of seats 20.

[0039] As shown in Figures 3 and 4, each of the seats 20 has a nut shape with a female thread portion 20a formed therein, while as shown in Figure 4, each of the cleats 30 has a pin shape with a male thread portion 30a formed therein.

[0040] As a result, the male thread portion 30a on each of the multiple cleats 30 screws into the female thread portion 20a on each of the multiple seats 20, thereby fixing each of the multiple cleats 30 in correspondence with the multiple seats 20, thereby making it possible to attach the multiple cleats 30 to the sole part 5A. The cleat 30 is attached to and detached from the sole part 5A in the direction of arrow DR shown in Figure 4.

[0041] 1 to 3, a plurality of protrusions 18 are provided at predetermined positions on the first main surface 10a of the plate portion 10 and in a portion not provided with the above-mentioned plurality of seats 20. Similar to the above-mentioned plurality of cleats 30, these plurality of protrusions 18 protrude from the ground contact surface 3a of the sole 3 to increase the propulsive force when kicking off.

[0042] 2 and 3, the multiple protrusions 18 are positioned so as to surround the above-mentioned multiple seat portions 20. Therefore, some of the multiple protrusions 18 are positioned so as to be continuous between pairs of adjacent seats among the multiple seats 20 (i.e., between seat portion 20A and seat portion 20B, between seat portion 20A and seat portion 20C, and between seat portion 20C and seat portion 20D).

[0043] As a result, a pair of adjacent seats 20 are intermittently connected by the multiple protrusions 18 provided between them. In other words, the plate part 10 between a pair of seats 20 provided at different positions with a distance from each other is provided with multiple protrusions 18 as ribs that intermittently connect the pair of seats 20. By configuring in this way, the multiple protrusions 18 as ribs not only contribute to improving the propulsive force at the time of kicking off as described above, but also function to reinforce the plate part 10 located between the seats 20.

[0044] Hereinafter, the portion of the sole part 5A where the seat portion 20 is provided and the detailed structure of the vicinity thereof will be described with particular reference to Fig. 4. Note that Fig. 4 is a diagram showing a cross section of the seat portion 20D and its vicinity among the four seats 20A-20D provided in the sole part 5A, but since these four seats 20A-20D all have the same shape as described above, and the structures of the vicinity of these four seats 20A-20D are also substantially the same, they will be described below without distinguishing between them.

[0045] As shown in FIG. 4, the seat 20 includes a cylindrical portion 21, a bottom portion 22, and a flange portion 23. The cylindrical portion 21 is a portion for receiving and holding the cleat 30, and has a hollow portion 24 therein. The above-mentioned female thread portion 20a is provided on the inner peripheral surface of the cylindrical portion 21. The bottom portion 22 closes the end of the hollow portion 24 on the second main surface 10b side in the axial direction (the direction in which the axis line AX shown in the drawing extends), and has a substantially disk-like shape. The flange portion 23 protrudes outward from the outer peripheral surface 21a of the cylindrical portion 21, and has an annular plate shape that goes around the cylindrical portion 21 in the circumferential direction.

[0046] Here, the flange 23 may be provided at any position along the axial direction of the tubular portion 21, but is preferably provided at a midpoint along the axial direction of the tubular portion 21, or at an end of the tubular portion 21 on the side where the bottom portion 22 is provided (i.e., an end on the second main surface 10b side). In the illustrated sole part 5A, the flange 23 is provided at a midpoint near the end of the tubular portion 21 on the side where the bottom portion 22 is provided.

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

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

[0049] On the other hand, the plate portion 10 is made of fiber reinforced resin as described above. Here, the plate portion 10 includes a reinforced region in which reinforcing fibers 13 are contained in the resin 12 as a base material. The reinforced region may be provided in the entire plate portion 10, or may be provided in a part of the plate portion 10. However, the reinforced region must be provided in at least a portion of the plate portion 10 that spans an overlapping region A and a non-overlapping region B, which will be described later, and this point will be described in detail later.

[0050] When viewed along a direction parallel to the axial direction of the hollow portion 24 of the seat portion 20, the plate portion 10 includes an overlapping region A that overlaps with the seat portion 20, and a non-overlapping region B that does not overlap with the seat portion 20. Here, the overlapping region A includes not only the portion that overlaps with the cylindrical portion 21 and the bottom portion 22 of the seat portion 20, but also the portion that overlaps with the flange portion 23.

[0051] The plate portion 10 is positioned so as to surround the periphery of the seat portion 20 such that the thickness direction of the plate portion 10 is parallel to the height direction of the seat portion 20. More specifically, the plate portion 10 covers a first main surface side surface 23a which is the surface on the first main surface 10a side of the flange portion 23, a second main surface side surface 23b which is the surface on the second main surface 10b side of the flange portion 23, and the outer circumferential surface 21a of the cylindrical portion 21, and also covers a surface 22a of the bottom portion 22 on the second main surface 10b side.

[0052] Here, since the sole part 5A is configured by a so-called insert molding as described above, the plate part 10 is fixed to the surface of the seat part 20 at the boundary between the plate part 10 and the seat part 20. More specifically, the plate part 10 is fixed to each of the first main surface side surface 23a and the second main surface side surface 23b of the flange part 23 and the outer circumferential surface 21a of the cylindrical part 21, and is also fixed to the surface 22a of the bottom part 22 on the second main surface 10b side.

[0053] By configuring it in this manner, the entire outer surface of the seat portion 20, except for the axial end face 21b on the first main surface 10a side, is covered by and joined to the plate portion 10, thereby making it possible to increase the joining strength between the plate portion 10 and the seat portion 20.

[0054] Furthermore, since the flange portion 23 protruding from the outer peripheral surface 21a of the tubular portion 21 is covered by the plate portion 10, not only is the bonding strength between the plate portion 10 and the seat portion 20 increased by increasing the bonding area, but the flange portion 23 is positioned so as to bite into the plate portion 10, thereby increasing the bonding strength between the plate portion 10 and the seat portion 20.

[0055] The plate portion 10 includes a thick portion 14 located outside and closer 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 fixed to the first main surface 23a and the second main surface 23b of the flange portion 23 and the outer circumferential surface 21a of the cylindrical portion 21.

[0056] The portion of the first main surface 10a constituting the thick-walled portion 14 adjacent to the cylindrical portion 21 is continuous with the axial end face 21b on the first main surface 10a side of the cylindrical portion 21 exposed to the outside. By configuring in this manner, the thickness of the plate portion 10 adjacent to the seat portion 20 can be made sufficiently thick, thereby increasing the joining strength between the plate portion 10 and the seat portion 20.

[0057] Moreover, the first main surface 10a of the portion constituting the thick portion 14 approaches the second main surface 10b as it moves away from the cylindrical portion 21, and includes a first curved surface 16 that smoothly connects to the first main surface 10a of the portion constituting the thin portion 15. In addition, the second main surface 10b of the portion constituting the thick portion 14 approaches the first main surface 10a as it moves away from the cylindrical portion 21, and includes a second curved surface 17 that smoothly connects to the second main surface 10b of the portion constituting the thin portion 15.

[0058] As a result, the portion of the plate portion 10 surrounding the seat portion 20 has a shape that bulges in the thickness direction compared to the surrounding area. With this configuration, it is possible to ensure a large bonding area between the plate portion 10 and the seat portion 20 while reducing the thickness of the plate portion 10 as a so-called high-rigidity plate, and it is possible to increase the bonding strength between the plate portion 10 and the seat portion 20.

[0059] Here, the thickness of the portion of plate portion 10 constituting 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 plate portion 10 constituting thin portion 15 is not particularly limited, but is preferably 0.5 mm or more and 2.5 mm or less, provided that the thickness is smaller than that of thick portion 14.

[0060] Here, in the sole part 5A according to the present embodiment, a reinforced region in which the reinforced fibers 13 are contained in the resin 12 as a base material provided in the plate portion 10 is located across the above-mentioned overlapping region A and non-overlapping region B. In other words, when viewed along a direction parallel to the axial direction of the hollow portion 24, the reinforced region extends along a direction perpendicular to the axial direction of the hollow portion 24 so as to include a portion where the tip of the flange portion 23 is located, and in the illustrated sole part 5A, the entire plate portion 10 shown in the figure is configured as the reinforced region.

[0061] This reinforced region may be, for example, a randomly oriented region in which reinforcing fibers 13 are randomly oriented in resin 12 as a base material, or a non-randomly oriented region in which reinforcing fibers 13 are regularly oriented in resin 12 as a base material. As the non-randomly oriented region, for example, the one in which reinforcing fibers 13 are oriented in one direction may be sufficient, or the one in which reinforcing fibers 13 are oriented in a plurality of directions such as two directions or three directions may be sufficient. In the present embodiment, the reinforced region is a randomly oriented region.

[0062] The average length L of the reinforcing fibers 13 included in this randomly oriented region is longer than the protruding length D from the outer peripheral surface 21a of the flange portion 23 described above (that is, the condition of 1.0 < L / D is satisfied). In the figure, for the sake of easy understanding, the length of one reinforcing fiber 13 is shown as L, but the average length L of the reinforcing fibers mentioned here is the average length of a plurality of reinforcing fibers 13 included in the randomly oriented region.

[0063] If configured in this way, due to the structure, at the boundary between the overlapping region A and the non-overlapping region B, which is the most vulnerable part based on the rigidity difference between the plate portion 10 and the seat portion 20, a large number of reinforcing fibers 13 exist in the resin 12 so as to straddle the boundary portion. Therefore, it becomes possible to surely enhance the reinforcing effect of the portion, and it becomes possible to significantly increase the fracture strength at the interface between the plate portion 10 and the seat portion 20.

[0064] In addition, in order to have a large number of reinforcing fibers 13 exist in the resin 12 so as to straddle the boundary portion described above, the longer the length of the reinforcing fibers 13, the better. The average length L of the reinforcing fibers 13 and the protruding length D from the outer peripheral surface 21a of the flange portion 23 preferably satisfy the condition of 1.08 ≦ L / D, more preferably satisfy the condition of 1.15 ≦ L / D, and even more preferably satisfy the condition of 1.30 ≦ L / D.

[0065] Also, when the axial length of the cylindrical portion 21 of the portion located on the first main surface 10a side with respect to the flange portion 23 (that is, the distance from the axial end surface 21b of the cylindrical portion 21 to the connection portion between the surface 23a on the first main surface side of the flange portion 23 and the outer peripheral surface 21a of the cylindrical portion 21) is H, it is preferable that the average length L of the reinforcing fibers 13 described above, the protruding length D of the flange portion 23, and the axial length H of the cylindrical portion 21 further satisfy the condition of 1 < L / (D + H). When configured in this way, it becomes possible to position more reinforcing fibers 13 so as to straddle the above-described boundary portion, and it is possible to further surely improve the fracture strength at the interface between the plate portion 10 and the seat portion 20.

[0066] Here, the thickness of the randomly oriented region of the portion covering the surface 23a on the first main surface side of the flange portion 23 and the thickness of the randomly oriented region of the portion covering the surface 23b on the second main surface side of the flange portion 23 are each preferably 0.5 mm or more. By configuring in this way, considering that the volume content of the reinforcing fibers in a general fiber-reinforced resin is 20% or more and 60% or less, it becomes possible to secure a considerable number of reinforcing fibers 13 positioned so as to straddle the above-described boundary portion, and thus it becomes possible to more surely increase the bonding strength between the plate portion 10 and the seat portion 20.

[0067] As described above, by using the sole part 5A for spikes according to the present embodiment, the sole 3 for spikes including this, and the spikes 1 including this, it is possible to provide the seat portion 20 for attaching the cleats 30 by insert molding to the plate portion 10 made of a fiber-reinforced resin while sufficiently ensuring the bonding strength between the plate portion 10 and the seat portion 20.

[0068] FIGS. 5 and 6 are schematic diagrams for explaining a method of manufacturing a sole part for spikes according to the present embodiment. Hereinafter, with reference to FIGS. 5 and 6, a method of manufacturing the sole part 5A for spikes according to the present embodiment will be described.

[0069] As described above, the sole part 5A according to the present embodiment includes the plate portion 10 made of fiber-reinforced resin, and the plate portion 10 includes a random orientation region in a portion spanning the overlap 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 is prepared as a raw material for the plate portion 10. The resin piece 10A contains a plurality of reinforcing fibers 13 inside a resin 12 as a base material, and the plurality of reinforcing fibers 13 are oriented so as to extend along one direction. The resin piece 10A is produced by cutting a larger resin sheet containing longer reinforcing fibers inside to a predetermined size, and the resin pieces 10A are prepared in the number necessary to manufacture the plate portion 10.

[0071] 6, the thickness directions of the prepared resin pieces 10A are aligned, and the pieces are stacked so that they face in random directions intersecting the thickness direction to prepare an assembly of the resin pieces 10A, which is then cut to produce a resin plate 10B of a predetermined shape. Here, for convenience, the resin plate 10B is shown to have a substantially rectangular outer shape in plan view, but in reality, a resin plate 10B with an outer shape corresponding to the shape of the plate portion 10 to be manufactured is prepared.

[0072] Next, the resin plate 10B is put into a mold in which a plurality of seat portions 20 are set in advance, and then press molding is performed using the mold. As a result, the plate portion 10 including the random orientation region is molded, and the plurality of seat portions 20 are integrated with the plate portion 10, so that in the manufactured sole part 5A, the random orientation region is located in the portion spanning the above-mentioned overlapping region A and non-overlapping region B.

[0073] In addition, when the above-mentioned manufacturing process is performed, the entire plate portion 10 of the sole part 5A is configured as a random orientation region, but when the resin plate 10B is manufactured, a predetermined region of the plate portion 10 can be replaced with a resin piece different from the above-mentioned assembly of the resin pieces 10A (for example, a resin piece that does not contain reinforcing fibers or a resin piece that contains multiple woven reinforcing fibers, etc.), or a larger resin piece that contains multiple regularly oriented reinforcing fibers, etc., to manufacture a sole part having a random orientation region only in a part of the plate portion 10. However, even in this case, in order to obtain sufficient bonding strength between the plate portion 10 and the seat portion 20, it is necessary to configure the portion spanning the above-mentioned overlapping region A and non-overlapping region B with a random orientation region.

[0074] Further, the above-mentioned method for producing the sole part 5A for spiked shoes is to produce it by press molding, but it is also possible to produce it by autoclave molding.

[0075] Here, the manufacturing method of the sole part 5A for spiked shoes described above shows an example of a case where a random orientation region as a reinforced region is formed so as to straddle the overlap region A and the non-overlapping region B, but the reinforced region may also be a non-random orientation region as described above.

[0076] In this case, one example of a method for manufacturing sole parts for spike shoes is to prepare in advance a reinforced fiber resin plate in which reinforcing fibers are oriented in one or more directions, drill holes in the portion of this reinforced fiber resin plate where the seat will be embedded, fit the seat into that portion, and press mold or autoclave mold the reinforced fiber resin plate in this state. In this case, if a portion in which the reinforcing fibers are oriented in one or more directions as described above is placed in a portion of the reinforced fiber resin plate that will be the boundary between the overlapping region A and the non-overlapping region B after molding, a non-random orientation region will be formed to straddle the overlapping region A and the non-overlapping region B.

[0077] <Embodiment 2> Fig. 7(A) is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to the second embodiment, and Fig. 7(B) is a bottom view of the main part. Hereinafter, the sole part for spiked shoes 5B according to this embodiment will be described with reference to Figs. 7(A) and 7(B). The sole part for spiked shoes 5B according to this embodiment is provided in the sole for spiked shoes 3 and the spiked shoes 1 in place of the sole part for spiked shoes 5A according to the first embodiment described above.

[0078] As shown in FIG. 7(A), a sole part 5B according to this 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 first main surface 10a of the portion constituting the thick portion 14 of the plate portion 10 is inclined more toward the second main surface 10b as it moves away from the cylindrical portion 21, so that the thickness of the thick portion 14 is configured to be significantly reduced at a position closer to the cylindrical portion 21 compared to that of the sole part 5A according to the above-mentioned first embodiment. Accordingly, the thickness of the thin portion 15 is also configured to be thinner compared to that of the sole part 5A for spiked shoes according to the above-mentioned first embodiment.

[0080] Even when configured in this manner, effects similar to those described in the above-mentioned embodiment 1 can be obtained, and while the seat portion 20 for attaching the cleats 30 is provided by insert molding in the plate portion 10 made of fiber reinforced resin, not only can the joining strength between the plate portion 10 and the seat portion 20 be sufficiently ensured, but the thickness of the thick portion 14 and the thin portion 15 is thinner, thereby making the sole part 5A lighter than that of the above-mentioned embodiment 1.

[0081] As shown in FIG. 7(B), in the sole part 5B according to this embodiment, the first curved surface 16 included in the first main surface 10a of the portion constituting the thick portion 14 and the second curved surface 17 included in the second main surface 10b of the portion constituting the thick portion 14 are both configured so that their curvature changes as they move away from the tubular portion 21, and a first imaginary line 16b connecting the first maximum curvature position 16a (see FIG. 7(A)), which is the position where the curvature of the first curved surface 16 is maximum, and a second imaginary line 17b connecting the second maximum curvature position 17a (see FIG. 7(A)), which is the position where the curvature of the second curved surface 17 is maximum, are configured so as not to overlap when viewed along a direction parallel to the axial direction of the hollow portion 24 (i.e., the direction in which the axis line AX shown in the figure extends).

[0082] In this configuration, it is possible to avoid arranging the first maximum curvature position 16a and the second maximum curvature position 17a, which may be weaker than the surrounding areas due to their structure, close to each other, and therefore it is possible to prevent damage to the thick portion 14 including the first maximum curvature position 16a and the second maximum curvature position 17a. This improves the strength of the sole part 5B as a whole, making it possible to provide it with excellent durability.

[0083] <First Modification> Fig. 8 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a first modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B1 for spiked shoes according to the first modified example will be described with reference to Fig. 8.

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

[0085] Specifically, flange portion 23 extends outward from the outer peripheral surface of the tubular portion so as to intersect with an imaginary plane perpendicular to the axial direction of hollow portion 24, and more particularly, flange portion 23 extends in a curved manner toward first main surface 10a as it moves away from tubular portion 21.

[0086] When configured in this manner, not only are effects similar to those described in the above-mentioned embodiment 2 obtained, but since the curved flange portion 23 is covered by the plate portion 10, a so-called anchor effect is obtained, thereby further improving the bonding strength between the plate portion 10 and the seat portion 20.

[0087] <Second Modification> Fig. 9 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a second modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B2 for spiked shoes according to the second modified example will be described with reference to Fig. 9.

[0088] As shown in FIG. 9, a sole part 5B2 according to the second modified example is different in the shape of the flange portion 23 when compared with the sole part 5B according to the above-described second embodiment.

[0089] Specifically, flange portion 23 extends outward from the outer peripheral surface of the tubular portion so as to intersect with an imaginary plane perpendicular to the axial direction of hollow portion 24, and more particularly, flange portion 23 extends in a wedge-like manner inclined toward first main surface 10a as it moves away from tubular portion 21.

[0090] When configured in this manner, not only can effects similar to those described in the above-mentioned second embodiment be obtained, but since the wedge-shaped inclined flange portion 23 is covered by the plate portion 10, a so-called anchor effect is obtained, and as a result, the bonding strength between the plate portion 10 and the seat portion 20 is further improved.

[0091] <Third Modification> Fig. 10 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a third modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B3 for spiked shoes according to the third modified example will be described with reference to Fig. 10.

[0092] As shown in FIG. 10, the sole part 5B3 of the third modified example differs from the sole part 5B2 of the second modified example described above only in the range of the random orientation region provided in the plate portion 10.

[0093] Specifically, in the sole part 5B3, the reinforcing fibers 13 are not located in a portion of the plate portion 10 that covers the surface 22a of the bottom portion 22 of the seat portion 20 on the second main surface 10b side.

[0094] Even in this configuration, it is possible to obtain effects similar to those described in the second embodiment and the second modified example.

[0095] <Fourth Modification> Fig. 11 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a fourth modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B4 for spiked shoes according to the fourth modified example will be described with reference to Fig. 11.

[0096] As shown in FIG. 11, the sole part 5B4 of the fourth modified example differs from the sole part 5B2 of the second modified example described above only in the range of the random orientation region provided in the plate portion 10.

[0097] Specifically, in the sole part 5B4, the reinforcing fibers 13 are not located in a portion of the plate portion 10 that covers the second main surface 23b of the flange portion 23 of the seat portion 20.

[0098] Even in this configuration, it is possible to obtain effects similar to those described in the second embodiment and the second modified example.

[0099] <Fifth Modification> Fig. 12 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a fifth modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B5 for spiked shoes according to the fifth modified example will be described with reference to Fig. 12.

[0100] As shown in FIG. 12, the sole part 5B5 according to the fifth modified example differs from the sole part 5B2 according to the second modified example described above only in the range of the random orientation region provided in the plate portion 10.

[0101] Specifically, in the sole part 5B5, the reinforcing fibers 13 are not located in a portion of the plate portion 10 that covers the first main surface 23a of the flange portion 23 of the seat portion 20.

[0102] Even in this configuration, it is possible to obtain effects similar to those described in the second embodiment and the second modified example.

[0103] <Sixth Modification> Fig. 13 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a sixth modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B6 for spiked shoes according to the sixth modified example will be described with reference to Fig. 13.

[0104] As shown in FIG. 13, a sole part 5B6 according to the sixth modified example is different in the shape of the plate portion 10 when compared with the sole part 5B2 according to the above-described second modified example.

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

[0106] Even when configured in this manner, effects similar to those described in the above-mentioned second embodiment and the second modified example can be obtained, and further, the weight of the sole part 5B6 can be reduced by the amount that the position at which the plate portion 10 is provided is reduced.

[0107] <Seventh Modification> Fig. 14 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to a seventh modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part for spiked shoes 5B7 according to the seventh modified example will be described with reference to Fig. 14.

[0108] As shown in FIG. 14, a sole part 5B7 according to the seventh modified example is different in the shape of the seat portion 20 when compared with the sole part 5B2 according to the above-described second modified example.

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

[0110] Even when configured in this manner, effects similar to those described in the above-mentioned embodiment 2 and second modified example can be obtained, and further, the weight of the sole part 5B7 can be reduced by the amount that the bottom 22 is not provided on the seat portion 20.

[0111] <Eighth Modification> Fig. 15 is a schematic cross-sectional view of a main part of a sole part for spiked shoes according to an eighth modified example based on the above-mentioned embodiment 2. Hereinafter, a sole part 5B8 for spiked shoes according to the eighth modified example will be described with reference to Fig. 15.

[0112] As shown in FIG. 15, a sole part 5B7 according to the seventh modified example is different in the shape of the plate portion 10 and the shape of the seat portion 20 when compared with the sole part 5B2 according to the second modified example described above.

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

[0114] Even when configured in this manner, effects similar to those described in the above-mentioned second embodiment and the second modified example can be obtained, and further, the weight of the sole part 5B8 can be reduced by the amount that the bottom 22 is not provided on the seat portion 20 and, in addition, by the amount that the position at which the plate portion 10 is provided is reduced.

[0115] <Embodiment 3> Fig. 16 is a bottom view of a spike shoe according to embodiment 3. Hereinafter, a spike shoe sole part 5C according to this embodiment will be described with reference to Fig. 16. Note that the spike shoe sole part 5C according to this embodiment is provided in the spike shoe sole 3 and the spike shoe 1 in place of the spike shoe sole part 5A according to embodiment 1 described above.

[0116] As shown in FIG. 16, a sole part 5C according to this 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 does not have the plurality of protrusions 18 (see FIGS. 1 to 3) that the sole part 5A according to the first embodiment has, and instead has a plurality of protruding parts 19 on the first main surface 10a of the plate part 10. The plurality of protruding parts 19 are provided between pairs of adjacent seats among the plurality of seats 20 (i.e., between the seats 20A and 20B, and between the seats 20C and 20D), and continuously connect these pairs of adjacent seats. In other words, the plurality of protruding parts 19 correspond to ribs that continuously connect the pairs of adjacent seats 20, and function to reinforce the plate part 10 in the portion located between these seats 20.

[0118] Even when configured in this manner, effects similar to those described in the above-mentioned embodiment 1 can be obtained, and the seat portion 20 for attaching the cleats 30 can be provided by insert molding in the plate portion 10 made of fiber reinforced resin, while still ensuring sufficient bonding strength between the plate portion 10 and the seat portion 20.

[0119] <Summary of the contents disclosed in the embodiments etc.> The features disclosed in the above-described embodiment and its modified examples can be summarized as follows.

[0120] [Appendix 1] a plate portion having a first main surface and a second main surface located on the opposite side to the first main surface; A sole part for a spike shoe, comprising: a seat portion to which a cleat can be detachably attached, and a part of which is embedded in the plate portion, The seat portion is made of a metal member including a cylindrical portion for receiving and holding the cleat and a flange portion protruding outward from an outer circumferential surface of the cylindrical portion, The plate portion is made of a fiber-reinforced resin molded product including at least a reinforced region in which reinforced fibers are contained in a resin as a base material, the seat portion is embedded in the plate portion with an end portion on the first principal surface side in the axial direction of a hollow portion, which is the space inside the cylindrical portion, exposed to the outside so that a cleat can be attached and detached on the first principal surface side, the plate portion includes an overlapping region that is a region that overlaps the seat portion and a non-overlapping region that is a region that does not overlap the seat portion when viewed along a direction parallel to an axial direction of the hollow portion, the reinforced region is located across at least the overlap region and the non-overlapping region, the reinforced region in the overlapping region is fixed to a surface of the flange portion on the first main surface side, a surface of the flange portion on the second main surface side, and an outer peripheral surface of the tubular portion; A sole part for spiked shoes, wherein the average length of reinforcing fibers included in the reinforcing region of a portion positioned across the overlapping region and the non-overlapping region is longer than the protruding length of the flange portion from the cylindrical portion.

[0121] [Appendix 2] A sole part for spiked shoes according to Appendix 1, further satisfying the condition of 1.08 ≦ L / D, where L is the average length of reinforcing fibers included in the reinforcing region of a portion positioned across the overlapping region and the non-overlapping region, and D is the protruding length of the flange portion from the cylindrical portion.

[0122] [Appendix 3] A sole part for spiked shoes according to Appendix 1 or 2, further satisfying the condition of 1 < L / (D + H), where L is the average length of reinforcing fibers included in the reinforcing region of a portion positioned across the overlapping region and the non-overlapping region, D is the protruding length of the flange portion from the cylindrical portion, and H is the distance between the portion of the surface on the first main surface side of the flange portion that connects to the cylindrical portion and the axial end surface of the cylindrical portion on the first main surface side.

[0123] [Appendix 4] A sole part for spiked shoes according to any one of Appendices 1 to 3, wherein the reinforcing region is composed of a randomly oriented region in which reinforcing fibers are randomly oriented in a resin as a base material.

[0124] [Appendix 5] The thickness of the reinforcing region of the portion covering the surface on the first main surface side of the flange portion is 0.5 mm or more, A sole part for spiked shoes according to any one of Appendices 1 to 4, wherein the thickness of the reinforcing region of the portion covering the surface on the second main surface side of the flange portion is 0.5 mm or more.

[0125] [Appendix 6] A sole part for spiked shoes according to any one of Appendices 1 to 5, wherein the flange portion extends outward from the outer peripheral surface of the cylindrical portion so as to intersect a virtual plane orthogonal to the axial direction of the hollow portion.

[0126] [Appendix 7] 7. The sole part for spiked shoes according to claim 6, wherein the flange portion extends toward the first main surface as it moves away from the tubular portion.

[0127] [Appendix 8] A sole part for spiked shoes described in any one of appendix 1 to 7, wherein the flange portion has an annular plate shape that goes around the circumferential direction of the cylindrical portion.

[0128] [Appendix 9] A sole part for spiked shoes described in any one of appendixes 1 to 8, wherein an axial end face of the first main surface side of the tubular portion is exposed to the outside, and the first main surface of a portion adjacent to the tubular portion is continuous with the axial end face.

[0129] [Appendix 10] A sole part for spiked shoes described in any one of appendix 1 to 9, wherein the seat portion further has a bottom portion closing the end portion of the hollow portion on the second main surface side in the axial direction.

[0130] [Appendix 11] The sole part for spike shoes described in Appendix 10, wherein the random orientation region in the overlapping region is fixed to the surface of the second main surface side of the bottom portion.

[0131] [Appendix 12] the plate portion includes a thick portion located outside and close to the cylindrical portion, and a thin portion located outside the thick portion, the first main surface of the portion constituting the thick portion moves toward the second main surface as it moves away from the cylindrical portion, and includes a first curved surface that is smoothly connected to the first main surface of the portion constituting the thin portion, A sole part for spiked shoes as described in any one of appendixes 1 to 11, wherein the second main surface of the portion constituting the thick portion moves toward the first main surface as it moves away from the tubular portion, and includes a second curved surface that smoothly connects to the second main surface of the portion constituting the thin portion.

[0132] [Appendix 13] Each of the first curved surface and the second curved surface is configured to have a curvature that changes with increasing distance from the cylindrical portion; A sole part for spiked shoes as described in Appendix 12, wherein a first virtual line connecting the positions where the curvature of the first curved surface is maximum and a second virtual line connecting the positions where the curvature of the second curved surface is maximum do not overlap when viewed along a direction parallel to the axial direction of the hollow portion.

[0133] [Appendix 14] The seat includes a first seat and a second seat disposed at different positions of the plate portion at a distance from each other, A sole part for spike shoes described in any one of appendixes 1 to 13, wherein a rib is provided on the plate portion in a portion located between the first seat portion and the second seat portion, the rib connecting the first seat portion and the second seat portion continuously or intermittently.

[0134] [Appendix 15] The sole part for spiked shoes according to claim 14, wherein the rib is provided on the first main surface.

[0135] [Appendix 16] 16. The sole part for spiked shoes according to any one of claims 1 to 15, wherein the reinforcing fibers contained in the random orientation region in the portion located across the overlap region and the non-overlapping region are carbon fibers.

[0136] [Appendix 17] A sole for spiked shoes comprising a sole part for spiked shoes according to any one of appendixes 1 to 16.

[0137] [Appendix 18] The sole for spike shoes described in Appendix 17; A spike shoe comprising an upper provided above the spike shoe sole.

[0138] [Appendix 19] 19. The spike shoes described in claim 18, wherein a cleat is attached to the seat portion.

[0139] <Other forms, etc.> In the above-described embodiment and its modified examples, an example has been given in which the flange portions provided on the seat portions are all configured to have a shape that goes around the circumferential direction of the cylindrical portion, but the flange portions do not necessarily have to be provided so as to go around the cylindrical portion, and they may be provided in a dotted row that is discontinuous along the circumferential direction of the cylindrical portion.

[0140] In addition, in the above-mentioned embodiment and its modified examples, examples have been given in which the flange portion provided on the seat portion is arranged so as to stand upright from the tubular portion, or is extended toward the first main surface side as it moves away from the tubular portion, but the flange portion may also be extended toward the second main surface side as it moves away from the tubular portion.

[0141] In addition, in the above-mentioned embodiment and its modified examples, an example has been described in which a rib is provided on the first main surface of the plate portion to continuously or intermittently connect a pair of adjacent seat portions, but the rib is not necessarily essential and may not be provided.

[0142] In addition, in the above-described embodiment and its modified examples, an example has been given in which the thickness of the sole parts is thinner than the thickness of the midsole, but the thickness of the sole parts may be configured to be equal to the thickness of the midsole, or the thickness of the sole parts may be configured to be thicker than the thickness of the midsole.

[0143] In addition, in the above-described embodiment and its modified examples, an example has been given in which the seat portions included in the sole parts are all configured to have the same shape, but it is not necessary for all of the seat portions included in the sole parts to have the same shape, and some of them may be configured to have a different shape from the others.

[0144] Furthermore, the various configurations disclosed in the above-mentioned embodiment and its modified examples can be modified as appropriate as long as they are not contrary to the spirit of this disclosure. For example, the number of seats provided in the sole part for spiked shoes is not limited to four, and may be more or less. Furthermore, although the above description has been given using as an example a case in which the cleats are attached to the seats by screwing, the cleats may be attached to the seats by other attachment methods.

[0145] Furthermore, the characteristic configurations disclosed in the above-described embodiment and its modified examples can be combined with each other without departing from the spirit of the present disclosure.

[0146] As such, the above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0147] 1 spike shoes, 2 upper, 3 spike shoe sole, 3a ground contact surface, 4 midsole, 5A to 5C, 5B1 to 5B8 spike shoe sole parts, 6A inner foot outsole, 6B outer foot outsole, 10 plate portion, 10A resin piece, 10B resin plate, 10a first main surface, 10b second main surface, 11 opening, 12 resin, 13 reinforcing fiber, 14 thick portion, 15 thin portion, 16 first curved surface, 16a first maximum curvature position, 16b first virtual line, 17 second curved surface, 17a second maximum curvature position, 17b second virtual line, 18 protrusion portion, 19 protruding portion, 20, 20A to 20D seat portion, 20a female screw 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 plate portion having a first main surface and a second main surface located on the opposite side to the first main surface; A sole part for a spike shoe, comprising: a seat portion to which a cleat can be attached in a detachable manner and a part of which is embedded in the plate portion, The seat portion is made of a metal member including a cylindrical portion for receiving and holding the cleat and a flange portion protruding outward from an outer circumferential surface of the cylindrical portion, The plate portion is made of a fiber-reinforced resin molded product including at least a reinforced region in which reinforced fibers are contained in a resin as a base material, the seat portion is embedded in the plate portion with an end portion on the first principal surface side in the axial direction of a hollow portion, which is a space inside the cylindrical portion, exposed to the outside so that a cleat can be attached and detached on the first principal surface side, the plate portion includes an overlapping region that is a region that overlaps the seat portion and a non-overlapping region that is a region that does not overlap the seat portion when viewed along a direction parallel to an axial direction of the hollow portion, The reinforced region is located across at least the overlap region and the non-overlapping region, the reinforced region in the overlapping region is fixed to a surface of the flange portion on the first main surface side, a surface of the flange portion on the second main surface side, and an outer peripheral surface of the tubular portion; A sole part for spiked shoes, wherein the average length of reinforcing fibers contained in the reinforced region in a portion located across the overlapping region and the non-overlapping region is longer than the protruding length of the flange portion from the tubular portion.

2. 2. The sole part for spike shoes as described in claim 1, further satisfying the condition of 1.08≦L / D, where L is an average length of the reinforcing fibers contained in the reinforced region in a portion located across the overlap region and the non-overlapping region, and D is a protruding length of the flange portion from the tubular portion.

3. 2. The sole part for spiked shoes as described in claim 1, further satisfying the condition 1<L / (D+H), where L is the average length of the reinforcing fibers contained in the reinforced region in a portion located across the overlapping region and the non-overlapping region, D is the protruding length of the flange portion from the tubular portion, and H is the distance between the portion of the surface of the first main surface side of the flange portion that connects to the tubular portion and the axial end face of the first main surface side of the tubular portion.

4. 2. The sole part for spiked shoes according to claim 1, wherein the reinforced region comprises a random orientation region in which reinforcing fibers are randomly oriented in a resin as a base material.

5. The thickness of the reinforced region covering the surface of the first main surface side of the flange portion is 0.5 mm or more, 2. The sole part for spiked shoes according to claim 1, wherein the reinforced region covering the surface of the flange portion on the second main surface side has a thickness of 0.5 mm or more.

6. 2. The sole part for spiked shoes according to claim 1, wherein the flange portion extends outward from an outer circumferential surface of the tubular portion so as to intersect with an imaginary plane perpendicular to an axial direction of the hollow portion.

7. The sole part for spiked shoes according to claim 6, wherein the flange portion extends toward the first main surface side as it moves away from the tubular portion.

8. The sole part for spiked shoes according to claim 1 , wherein the flange portion has an annular plate shape that goes around in a circumferential direction of the cylindrical portion.

9. 2. The sole part for spike shoes according to claim 1, wherein an axial end face on the first main surface side of the tubular portion is exposed to the outside, and the first main surface of a portion adjacent to the tubular portion is continuous with the axial end face.

10. 2. The sole part for spiked shoes according to claim 1, wherein the seat portion further has a bottom portion closing an axial end portion of the hollow portion on the second main surface side.

11. The sole part for spiked shoes according to claim 10, wherein the reinforced region in the portion located in the overlapping region is fixed to a surface on the second main surface side of the bottom portion.

12. 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, the first main surface of the portion constituting the thick portion is directed toward the second main surface as it moves away from the cylindrical portion, and includes a first curved surface that is smoothly connected to the first main surface of the portion constituting the thin portion, 2. The sole part for spike shoes according to claim 1, wherein the second main surface of the portion constituting the thick portion is directed toward the first main surface as it moves away from the tubular portion, and includes a second curved surface that is smoothly connected to the second main surface of the portion constituting the thin portion.

13. Each of the first curved surface and the second curved surface is configured to have a curvature that changes with increasing distance from the cylindrical portion, 13. The sole part for spike shoes according to claim 12, wherein a first virtual line connecting the positions at which the curvature of the first curved surface is maximum and a second virtual line connecting the positions at which the curvature of the second curved surface is maximum do not overlap when viewed along a direction parallel to the axial direction of the hollow portion.

14. The seat includes a first seat and a second seat disposed at different positions of the plate portion at a distance from each other, 2. The sole part for spike shoes according to claim 1, wherein a rib is provided on the plate portion located between the first seat portion and the second seat portion, the rib connecting the first seat portion and the second seat portion continuously or intermittently.

15. The sole part for spiked shoes according to claim 14, wherein the rib is provided on the first main surface.

16. 2. The sole part for spiked shoes according to claim 1, wherein the reinforcing fibers included in the reinforced region in a portion located across the overlapping region and the non-overlapping region are carbon fibers.

17. A sole for spiked shoes comprising the sole part for spiked shoes according to any one of claims 1 to 16.

18. The sole for spiked shoes according to claim 17; and an upper provided above the sole for spike shoes.

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

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