JP6450729B2 - Sole structure and baseball spike shoes using the same - Google Patents

Description

  The present invention relates to a sole structure and a baseball spike shoe using the same, and more particularly to a sole structure of a baseball spike shoe suitable for a baseball hitting operation and a baseball spike shoe using the same.

  Conventionally, as a sole structure for spike shoes for baseball, for example, a sole structure as disclosed in Patent Document 1 has been proposed.

  In Patent Document 1, a toe portion protrusion piece, a base ball portion protrusion piece, a stepping portion protrusion piece, a heel ball portion protrusion piece, a heel inner side protrusion piece, a heel front portion protrusion piece, a heel rear end There is disclosed a sole structure of a baseball spike shoe provided with a part protrusion and a heel outer side protrusion. In this sole structure, the position and orientation of each projecting piece are determined in order to exhibit excellent slip resistance (so-called traction) for various operations such as batting, throwing, fielding, and running in a baseball game. .

JP 09-173104 A

  By the way, in general, in a baseball batting operation, for example, a batter standing in a right at-bat takes a swing from a state where a left foot is stepped on the ground and a ball hits a bat (so-called impact) until the batter swings the bat as it is. Various research results have revealed that a large impact occurs on the outer side of the forefoot in the left foot (hereinafter referred to as “stepping foot”) of the batter that has stepped on the ground during movement (so-called follow-through). Yes. And, by suppressing the impact transmitted from the stepping foot after the impact, the operation of rotating toward the outer side of the foot around the buttocks of the stepping foot of the batter (hereinafter referred to as “rotating operation”) is not hindered. Thus, it is desired that the batter can swing the bat sufficiently.

  However, in the sole structure of Patent Document 1, the position and orientation of each protruding piece are determined so that the traction with respect to the batter's foot is maximized in various operations of the baseball game. For this reason, the traction on the batter's foot is too effective, but after the impact, the stepping foot gets caught on the ground more than necessary, and the impact is transmitted to the stepping foot. As a result, the impact described above becomes a load on the stepping foot, which is a factor that hinders the rotation of the stepping foot during follow-through.

  As described above, in the sole structure of Patent Document 1, the position and orientation of each projecting piece are determined so that the traction is maximized for all the motions in the baseball game. There was a problem that the batter could not swing the bat sufficiently because the rotation of the stepping foot was hindered. In other words, the sole structure of Patent Document 1 is not necessarily configured so that optimum traction can be exerted on a batter's foot in a baseball batting operation.

  The present invention has been made in view of such a point, and an object thereof is to make it possible to exhibit optimum traction with respect to a batter's foot during a baseball batting operation.

  In order to achieve the above object, in the sole structure according to the present invention and the spike shoes for baseball using the same, the striking motion of baseball can be achieved by devising the arrangement, material, and shape of studs provided on the outsole. I was able to demonstrate optimal traction at times.

Specifically, the first embodiment of the present invention relates to a sole structure, and the sole structure includes an outsole that supports the back of the foot from the front foot portion to the rear foot portion of the wearer's foot. Is a sole structure of a baseball spike shoe used when performing a baseball batting operation. In the lower surface of the outsole, the outer side region located on the outer side of the forefoot part including the second proximal phalanx and metatarsal bone and the third to fifth ribs and metatarsal bones of the foot A plurality of studs projecting toward the outer side are provided in a state dispersed in the outer side region. The plurality of studs include a high traction stud having a high traction property and at least one low traction stud disposed around the high traction stud and having a traction property lower than that of the high traction stud. The low traction stud includes a pair of first low traction studs spaced from the high traction stud on each of the front side and the rear side of the high traction stud. Each of the first low traction studs is arranged such that the bottom of the triangle, which is the outer shape of the lower surface when viewed from the bottom, is located on the outer side and the apex of the triangle is located on the inner side. It is formed in a tapered shape from the side toward the inner shell side. In each of the high traction stud and the pair of first low traction studs, the length in the direction along the stress direction that is the direction of the shear stress generated in the outer side region during the follow-through of the hitting operation is orthogonal to the stress direction. It is comprised so that it may become longer than the length of the direction to do.

In the first mode, each of the high and the pair of first low traction studs arranged in the outer side region is in a direction along the stress direction that is the direction of the shear stress generated in the outer side region during the follow-through of the hitting operation. Is configured to be longer than the length in the direction orthogonal to the stress direction. In other words, in the first embodiment, the direction of each traction stud is configured so as to be along the stress direction so as not to oppose the direction of the shear stress generated in the outer side region during the follow-through of the hitting operation. Is. For this reason, in the first embodiment, after the impact, the batter's stepping foot does not get caught on the ground more than necessary, and the batter's stepping foot rotation operation is not hindered during follow-through. That is, in the first embodiment, the impact is unlikely to occur on the outer side of the front foot portion of the batter's stepping foot, so that the stepping foot rotates smoothly during follow-through. As a result, the batter can fully swing the bat. Furthermore, since the plurality of studs made up of the high and pair of first low traction studs are arranged in the outer side region, predetermined traction characteristics are secured in the outer side region. Therefore, in the 1st form, the optimal traction can be exhibited with respect to a batter's leg at the time of a baseball batting operation. Furthermore , since the first low traction studs in the outer side area are arranged on the front side and the rear side of the high traction studs, the balance between the traction characteristics in the front-rear direction of the outer side area together with the high traction studs is further increased. Can keep.

The second form is characterized in that, in the first form, the first low traction stud is made of thermoplastic polyurethane.

In the second form, the high wear resistance of the thermoplastic polyurethane can suppress the aging deterioration of the first low traction stud.

The third form is the first or second form, wherein the low traction stud includes a second low traction stud disposed on the inner side of the high traction stud and spaced from the high traction stud . In the second low traction stud, the length in the direction along the stress direction, which is the direction of the shear stress generated in the outer side region during the follow-through of the hitting operation, is longer than the length in the direction orthogonal to the stress direction. It is comprised as follows.

In the third mode, the second low traction stud provides moderate traction with the high traction stud in the outer side area, while preventing the foot from partially dropping in the width direction of the outer side area. Thus, it is possible to eliminate unevenness of the sole surface in the sole structure.

A 4th form is a spike shoe for baseball provided with any one sole structure of the 1st- 3rd form.

In the fourth embodiment, it is possible to obtain a baseball spike shoe having the same effects as the first to third embodiments.

  As described above, according to the present invention, the stepping foot can be smoothly rotated during the follow-through of the striking motion, allowing the batter to fully swing the bat, and the high and low traction studs to Since the predetermined traction property is ensured in the side region, it is possible to exert optimum traction on the batter's foot particularly during baseball batting operation.

FIG. 1 is a plan view of a sole structure according to an embodiment of the present invention. FIG. 2 is an overall perspective view showing the sole structure as seen from below. FIG. 3 is a bottom view of the sole structure. FIG. 4 is a bottom view showing a state in which the structure of a human foot is superimposed on the sole structure as seen from the bottom surface side. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a shear stress distribution diagram showing the foot pressure distribution and the direction of the shear stress during the batting operation of the right batter. FIG. 7 is a partially enlarged view showing the outer side region X of FIG. 3 in an enlarged manner.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely exemplary in nature, and is not intended to limit the present invention, its application, or its use.

  1 to 3 show an entire sole structure 1 according to an embodiment of the present invention, and the sole structure 1 supports the back surface of a wearer (a batter in a baseball game). A shoe in which an upper (not shown) or the like is provided on the sole structure 1 is mainly used as a baseball spike shoe suitable for a baseball hitting operation.

  Here, the sole structure 1 illustrates only the sole structure of the shoe for the left foot. Since the sole structure of the right foot shoe is configured to be bilaterally symmetrical to that of the left foot shoe, only the sole structure of the left foot shoe will be described in the following description, and the sole structure of the right foot shoe will be described. Omitted. In the following description, upper (upper) and lower (lower) represent the positional relationship in the vertical direction of the sole structure, and forward (front) and rear (rear) are positional relationships in the longitudinal direction of the sole structure. The inner side and the outer side represent the positional relationship in the foot width direction of the sole structure.

  As shown in FIGS. 1 to 4, the sole structure 1 includes an outsole 2 that supports the entire back surface of the foot from the front foot F to the rear foot H. The outsole 2 is made of, for example, a thermoplastic resin such as polyamide resin (nylon (registered trademark)), a resin material such as polyurethane (PU) or nylon elastomer, or a rubber material such as synthetic rubber or natural rubber. It is formed in a thin plate shape.

  Further, on the lower surface of the outsole 2, a reinforcing rib 3 protruding downward is formed integrally with the outsole 2 at a substantially central position in the foot width direction. The reinforcing rib 3 extends from the rear part of the front foot part F to the rear foot part H. The reinforcing rib 3 enhances the bending rigidity from the rear part of the front foot part F to the rear foot part H in the outsole 2.

  A plurality of pedestal portions 12, 23,... Projecting downward are formed integrally with the outsole 2 on the lower surface of the outsole 2. Each pedestal portion 12 is for fixing each of high traction studs 10a to 10f, which will be described later, and is formed in a substantially triangular shape in a bottom view. Each pedestal portion 23 is for fixing each of first low traction studs 21a to 21g, which will be described later, and is formed in a substantially triangular shape in a bottom view. As shown in FIG. 5, each pedestal portion 23 is formed with recessed groove portions 24 and 24 that are recessed upward from the lower surface of the pedestal portion 23.

  Next, as shown in FIGS. 1 and 2, the sole structure 1 includes a midsole 4 that supports the back of the foot from the position in the front-rear direction substantially center of the front foot F to the rear foot H. The midsole 4 is made of a soft elastic material, for example, a thermoplastic synthetic resin such as ethylene-vinyl acetate copolymer (EVA) or a foam thereof, a thermosetting resin such as polyurethane (PU) or a foam thereof, Rubber materials such as butadiene rubber and chloroprene rubber and foams thereof are suitable. In addition, the upper part (not shown) which covers a user's leg | foot is provided in the peripheral part of the outsole 2 and the midsole 4. As shown in FIG.

  Next, as shown in FIGS. 1 to 4, a plurality of studs protruding downward are provided on the lower surface of the outsole 2 in a dispersed state. The plurality of studs are arranged around each of the high traction studs 10a to 10f having high traction properties (slip resistance) and the high traction studs 10a to 10f, and the low studs have lower traction than the high traction studs 10a to 10f. Traction studs 20, 20,.

  Each of the high traction studs 10a to 10f is made of a metal material such as a steel material, an aluminum alloy, or a titanium alloy, a metal material having a high wear resistance and high toughness, ceramics, or the like. Each of the high traction studs 10 a to 10 f is formed in a plate shape that protrudes downward from the lower surface of the outsole 2.

  Specifically, as shown in FIG. 5, each of the high traction studs 10 a to 10 f is formed in a substantially L shape in a cross-sectional view and has plate-like flat plate portions 11 and 11 that are orthogonal to each other. . A holding portion 13 made of a material having a higher hardness than the outsole 2 is embedded in each pedestal portion 12 of the outsole 2. In the present embodiment, the outsole 2 has a Shore D hardness of 63D, and the holding portion 13 has a Shore D hardness of 69D. In each of the high traction studs 10a to 10f, one flat plate portion 11 is held by the holding portion 13 and the pedestal portion 12, and the other flat plate portion 11 protrudes downward from the holding portion 13 and the pedestal portion 12. It is fixed to the outsole 2 so as to be in a state.

  Here, each of the high traction studs 10a to 10c is configured so that the grip force of both the batter's feet with respect to the ground is increased in the operation from the time when the batter starts swinging the bat to the moment when the ball hits the bat (so-called swing motion). The direction is fixed. And as shown in FIG. 4, the high traction stud 10a is arrange | positioned in the position corresponding to 2nd distal phalanx DP2 of a leg | foot. The high traction stud 10b is disposed at a position corresponding to the first proximal phalanx PP1 of the foot. The high traction stud 10c is disposed at a position corresponding to the rear portion of the first metatarsal MT1 of the foot.

  Further, each of the high traction studs 10d and 10e is oriented so that the gripping force of the batter's stepping foot (left foot in the case of a right batter) with respect to the ground is enhanced. As shown in FIG. 4, the high traction stud 10d is arranged at a position corresponding to the inner side of the foot rib HL, while the high traction stud 10e is located on the outer side of the foot rib HL. It is arranged at a position corresponding to. The arrangement of the high traction stud 10f will be described later.

  Next, as shown in FIGS. 2 to 4, some of the low traction studs 20, 20,... Are composed of first low traction studs 21 a to 21 g. Each of the first low traction studs 21a to 21g is made of a highly wear-resistant resin material such as thermoplastic polyurethane. In addition, each of the first low traction studs 21a to 21g is formed such that the outer shape of the lower surface is formed in a substantially triangular shape in a bottom view, and is tapered from a substantially central portion in the vertical direction to a lower end portion in a sectional view. (See FIG. 5). In particular, the first low traction studs 21f and 21g are formed so that the outer shape of the lower surface is a substantially isosceles triangle when viewed from the bottom.

  Here, as shown in FIG. 5, projecting portions 22 and 22 projecting upward in a sectional view are formed on the upper portions of the first low traction studs 21f and 21g. Each of the first low traction studs 21f and 21g is fixed to each pedestal portion 23 in a state in which each protruding portion 22 is fitted in each of the recessed groove portions 24 and 24 of each pedestal portion 23, and substantially in the center in the vertical direction. The part from the part to the lower end part is configured to protrude downward from each pedestal part 23. The first low traction studs 21a to 21e are configured in the same manner as the first low traction studs 21f and 21g.

  2 to 4, the first low traction stud 21a has a height from the ground in the foot width direction with respect to the first low traction studs 21f and 21g disposed in the outer side region X. It is provided to maintain the balance. Specifically, the first low traction stud 21a is disposed at a position corresponding to the front portion of the first metatarsal MT1 of the foot.

  Each of the first low traction studs 21b to 21e is provided in order to maintain a balance in height from the ground in the foot width direction in the range from the middle foot portion M to the rear foot portion H. Further, each of the first low traction studs 21b to 21e is formed such that the area of the lower surface (that is, the grounding surface) is larger than the area of the lower surface of each of the first low traction studs 21f and 21g.

  As shown in FIG. 4, the first low traction stud 21 b is arranged at a position corresponding to the scaphoid bone NB of the foot. The first low traction stud 21c is disposed at a position corresponding to the inner side of the rear part of the rib HL of the foot. The first low traction stud 21d is arranged at a position corresponding to the outer side of the rear part of the rib HL of the foot. The first low traction stud 21e is disposed at a position corresponding to the rear end portion of the fifth metatarsal bone MT5 of the foot and the outer shell side of the cubic bone CB. The arrangement of the first low traction studs 21g and 21f will be described later.

  Next, as shown in FIGS. 2 to 4, on the lower surface of the outsole 2, the second proximal phalanx PP2 and the metatarsal bone MT2 of the foot, the third to fifth ribs, and the metatarsal bone MT3 to MT5, Are provided in a state in which the high and low traction studs 10f, 20,... Are dispersed in the outer side region X. Here, the rib is a general term for a part of the bone of the foot including the proximal phalanx DP, the middle phalanx IP, and the distal phalanx PP.

  And each of the high and low traction studs 10f, 20,... Arranged in the outer side region X has the direction of each shear stress S (see FIG. 6) generated in the outer side region X during the follow-through of the striking operation. The length in the direction along the stress direction is longer than the length in the direction orthogonal to the stress direction. FIG. 6 shows a shear stress distribution diagram related to the baseball batting operation, which is necessary to prevent the sole structure 1 (outsole 2) from slipping in relation to the ground when performing the batting operation. The area where the shear stress S acts (see the broken line in FIG. 6) and the direction (stress direction) of the shear stress S are expressed.

  As shown in FIGS. 2 and 3, the high traction stud 10 f is disposed in the outer side region X in the vicinity of the outer side edge of the outsole 2. Specifically, as shown in FIG. 4, the high traction stud 10f is arranged at a position corresponding to the fourth to fifth proximal phalanx PP4 to PP5 of the foot.

  The high traction stud 10f extends forward from the inner side toward the outer side as viewed from the bottom. Specifically, as shown in FIG. 7, the high traction stud 10 f has a line segment L <b> 1 (see the broken line shown in FIG. 7) corresponding to the long side of the rectangle that is the outer shape of the lower surface when viewed from the bottom. It is formed to be long along the direction (stress direction) of the shear stress S generated at the position of the traction stud 10f. For example, as shown in FIGS. 3 and 7, the high traction stud 10f has a rotation center point O at a position corresponding to the heel portion of the foot in bottom view, and the center of the rotation centroid O and the lower surface of the high traction stud 10f. In the virtual arc A whose radius is the distance from the point R1 (the center of the rectangle), the direction in which the line segment L1 is tilted 24 ° counterclockwise with respect to the tangent a of the virtual arc A with the position of the point R1 as the center point It is comprised so that it may extend toward. As shown in FIG. 4, it is assumed that the rotation center point O is at a position corresponding to the approximate center in the front-rear direction and the foot width direction of the rib HL (heel part) in bottom view.

  Further, each of the first low traction studs 21g and 21f is disposed on the front side and the rear side of the high traction stud 10f in the outer side region X, respectively. Specifically, as shown in FIG. 4, the first low traction stud 21g is arranged at a position corresponding to the third middle phalanx IP3 of the foot. The first low traction stud 21f is arranged at a position corresponding to the fifth metatarsal MT5 of the foot.

  The first low traction stud 21g extends forward from the inner side toward the outer side. Specifically, as shown in FIG. 7, the first low traction stud 21 g has a vertical bisector L2 (see the broken line shown in FIG. 7) of the base of a substantially isosceles triangle that is the outer shape of the lower surface when viewed from the bottom. It is formed to be longer along the direction (stress direction) of the shear stress S generated at the position of the first low traction stud 21g shown in FIG. For example, as shown in FIG. 3 and FIG. 7, the first low traction stud 21g has a rotation center point O and a point R2 corresponding to the inner center of a substantially isosceles triangle that is the outer shape of the lower surface of the first low traction stud 21g. In the virtual arc B having the radius as the distance, the line segment L2 is configured to extend counterclockwise about the point R2 in a direction inclined by 30 ° with respect to the tangent line b of the virtual arc B.

  The first low traction stud 21f extends rearward from the inner side toward the outer side. Specifically, as shown in FIG. 7, the first low traction stud 21f has a vertical bisector L3 (refer to the broken line shown in FIG. 7) of the base of a substantially isosceles triangle that is the bottom surface in bottom view. It is formed to be longer along the direction (stress direction) of the shear stress S generated at the position of the first low traction stud 21f shown in FIG. For example, as shown in FIGS. 3 and 7, the first low traction stud 21f has a rotation center point O and a point R3 corresponding to the inner center of a substantially isosceles triangle that is the outer shape of the lower surface of the first low traction stud 21f. In the virtual arc C having the radius as the distance, the line segment L3 is configured to extend counterclockwise about the point R3 in a direction inclined by 10 ° with respect to the tangent line c of the virtual arc C.

  Further, as shown in FIGS. 2 and 3, in the outer side region X, a second low traction stud 25 disposed at a distance from the high traction stud 10 f is provided on the inner side of the high traction stud 10 f. It has been. The second low traction stud 25 is configured as a part of the low traction stud 20. Specifically, as shown in FIG. 4, the second low traction stud 25 is disposed at a position corresponding to the front end portions of the second to third metatarsals MT2 to MT3 of the foot. The second low traction stud 25 is made of, for example, the same material as the outsole 2 and is formed integrally with the outsole 2 so as to protrude downward from the lower surface of the outsole 2. The second low traction stud 25 has a substantially rectangular outer shape on the bottom surface when viewed from the bottom.

  Similar to the high traction stud 10f, the second low traction stud 25 extends forward from the inner side toward the outer side. Specifically, as shown in FIG. 7, the second low traction stud 25 has a line segment L4 (see the broken line shown in FIG. 7) corresponding to the long side of the rectangle that is the outer shape of the lower surface when viewed from the bottom. It forms so that it may become long along the direction (stress direction) of the shear stress S which arises in the position of the 2nd low traction stud 25 shown. For example, as shown in FIG. 3 and FIG. 7, the second low traction stud 25 is a virtual whose radius is the distance between the rotation center point O and the point R4 that is the center (rectangular center) of the second low traction stud 25. In the arc D, the line segment L4 is configured to extend counterclockwise about the point R4 in a direction inclined by 13 ° with respect to the tangent line d of the virtual arc D.

  Here, the direction of each of the high and low traction studs 10f, 21f, 21g, 25 arranged in the outer side region X is not limited to each angle as described above. That is, each of the high and low traction studs 10f, 21f, 21g, and 25 is a position (ie, the center of gravity) of the bottom surface of each stud with respect to any one of the tangents a to d of the corresponding virtual arcs A to D. It is preferably formed so as to extend counterclockwise in the range of 0 to 30 ° with respect to the center point. Within this range, each of the high and low traction studs 10f, 21f, 21g, 25 is in the direction (stress direction) of each shear stress S generated at each position shown in the stress distribution diagram (see FIG. 6). It can be arranged along.

[Effects of Embodiment]
Generally, in a baseball batting operation, for example, an operation (so-called impact) from a state where a batter standing in the right at-bat stepped on his left foot to the ground and hit a swinging bat (so-called impact) until the batter swings out the bat as it is (so-called so-called impact). Various research results have revealed that a large impact occurs on the outer side of the front foot F in the left foot (stepping foot) of the batter stepped on the ground during follow-through. Further, by suppressing the impact transmitted to the stepping foot after this impact, the operation (rotation operation) that rotates toward the outer side of the foot around the buttocks of the stepping foot of the batter is not obstructed, and the batter Can fully swing the bat.

  In the sole structure 1 according to the present embodiment, each of the high and low traction studs 10f, 20,... (10f, 21f, 21g, 25) arranged in the outer side region X is outside during the follow-through of the hitting operation. The length in the direction along the stress direction that is the direction of each shear stress S generated in the instep side region X is configured to be longer than the length in the direction orthogonal to the stress direction. In other words, in the sole structure 1 according to the present embodiment, the orientation of each of the high and low traction studs 10f, 20,... Arranged in the outer side region X is changed to the outer side region X during the follow-through of the hitting operation. In order not to oppose the direction of each generated shear stress S, it is configured so as to be along the stress direction. For this reason, in the sole structure 1, after the impact, the batter's stepping foot does not get caught on the ground more than necessary, and the batter's stepping foot's rotational motion is not hindered during follow-through. That is, in the sole structure 1, the impact is unlikely to occur on the outer side of the forefoot F of the batter's stepping foot, so that the stepping foot rotates smoothly during follow-through. As a result, the batter can fully swing the bat. Further, since a plurality of studs composed of high and low traction studs 10f, 20,... Are arranged in the outer side region X, predetermined traction characteristics are secured in the outer side region X. Therefore, in the sole structure 1 according to the present embodiment, it is possible to exert optimum traction with respect to the batter's foot during the baseball batting operation.

  Moreover, since each of the first low traction studs 21g, 21f in the outer side region X is disposed on the front side and the rear side of the high traction stud 10f, the front and rear sides of the outer side region X together with the high traction studs 10f. Balance of traction in the direction can be maintained.

  In addition, since the first low traction studs 21f and 21g are made of thermoplastic polyurethane, the deterioration over time of the first low traction studs 21f and 21g can be suppressed due to the high wear resistance of the thermoplastic polyurethane.

  Further, since the low traction stud 20 includes a second low traction stud 25 disposed on the inner side of the high traction stud 10f and spaced apart from the high traction stud 10f, the high traction stud 10f in the outer side region X is included. At the same time, it is possible to eliminate the unevenness of the back surface of the sole structure 1 so that the foot does not partially fall in the width direction of the outer side region X while exhibiting appropriate traction.

[Other Embodiments]
In the sole structure 1 according to the above embodiment, each of the first low traction studs 21a to 21g is made of thermoplastic polyurethane. However, the present invention is not limited to this. For example, each of the first low traction studs 21a to 21g may be made of a wear-resistant synthetic rubber, natural rubber, or the like. Alternatively, each of the first low traction studs 21a to 21g may be formed of the same material as the outsole 2 (ie, polyamide resin) by integral molding with the outsole 2. In the form by such integral molding, the wear resistance of each of the first low traction studs 21a to 21g is lowered due to the wear resistance of the polyamide resin being lower than that of the thermoplastic polyurethane shown in the above embodiment. On the other hand, by integrally molding the outsole 2 and the first low traction studs 21a to 21g, the productivity of the sole structure 1 is improved and the weight can be reduced.

  In the sole structure 1 according to the above embodiment, each of the high traction stud 10f, the first low traction studs 21f and 21g, and the second low traction stud 25 arranged in the outer side region X is the same as the above embodiment. It is not limited to the shape shown. That is, each of the high and low traction studs 10f, 20,... Arranged in the outer side region X is along a stress direction that is the direction of each shear stress S generated in the outer side region X during the follow-through of the striking operation. It is sufficient that the length in the direction is longer than the length in the direction orthogonal to the stress direction.

  In the sole structure 1 according to the above embodiment, the high traction stud 10f is arranged in the outer side region X at positions corresponding to the fourth to fifth proximal phalanx PP4 to PP5 of the foot. However, it is not limited to this form. That is, the high traction stud 10f may be arranged at any position in the outer side region X.

[Reference embodiment]
In the sole structure 1 according to the above SL embodiment, the first low traction stud 21f, a 21g and a second low traction studs 25, although the form which is arranged on the outer lateral side region X around the high traction studs 10f However, the present invention is not limited to this form. For example, only one of the first low traction studs 21f and 21g may be arranged around the high traction stud 10. Alternatively, only the second low traction stud 25 may be disposed around the high traction stud 10f. In short, it is sufficient that at least one low traction stud 20 is arranged around the high traction stud 10f in the outer side region X.

  As mentioned above, although embodiment about this invention was described, this invention is not limited only to the above-mentioned embodiment, A various change is possible within the scope of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be industrially utilized as a sole structure of a baseball spike shoe suitable for a baseball hitting operation and a baseball spike shoe using the same.

1: Sole structure 2: Outsole 4: Midsole 10a to 10f: High traction stud 20: Low traction stud 21a to 21g: First low traction stud 25: Second low traction stud F: Forefoot part M: Middle foot part H : Hind foot X: outer side region DP: distal phalanx IP: middle phalanx PP: proximal phalanx MT: metatarsal bone NB: scaphoid CB: cubic bone HL: rib S: shear stress

Claims (4)

A sole structure of a spike shoe for baseball that includes an outsole that supports a back surface of a foot of a wearer from a front foot portion to a rear foot portion and is used when the wearer performs a baseball batting operation,
In the lower surface of the outsole, the outer side region located on the outer side of the forefoot part including the second proximal phalanx and metatarsal bone of the foot and the third to fifth ribs and metatarsal bone, A plurality of studs projecting downward are provided in a state of being dispersed in the outer side area,
The plurality of studs are
High traction studs with high traction,
Having at least one low traction stud disposed around the high traction stud and having lower traction than the high traction stud;
The low traction stud includes a pair of first low traction studs spaced apart from the high traction stud on the front side and the rear side of the high traction stud,
Each of the first low traction studs is disposed such that the bottom of the triangle, which is the outer shape of the lower surface when viewed from the bottom, is located on the outer side and the apex of the triangle is located on the inner side, It is formed in a tapered shape from the outer side toward the inner side.
Each of the high traction stud and the pair of first low traction studs has a length in a direction along a stress direction which is a direction of a shear stress generated in the outer side region at the time of follow-through of a striking operation. A sole structure configured to be longer than the length in the orthogonal direction. The sole structure according to claim 1 ,
The first low traction stud is a sole structure made of thermoplastic polyurethane. The sole structure according to claim 1 or 2 ,
The low traction studs, saw including a second low traction studs spaced high-traction studs and spacing the medial side of the high-traction studs,
In the second low traction stud, the length in the direction along the stress direction, which is the direction of the shear stress generated in the outer side region during the follow-through of the hitting operation, is longer than the length in the direction orthogonal to the stress direction. The sole structure is configured as follows . The spike shoes for baseball provided with the sole structure of any one of Claims 1-3 .

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