JP7402230B2 - shoes - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shoes, and more particularly to shoes with increased stability.

Conventionally, shoes used for running and walking are required to have both cushioning properties that absorb shock upon landing and stability upon landing. Stability when landing is particularly important from the perspective of preventing injuries. If the stability of the shoe is low, the foot tilts too far toward the medial side when landing, which is called overpronation, which increases the possibility of injury. . Therefore, it is extremely important to suppress overpronation, and a technique described in Patent Document 1, for example, is known as a technique for realizing this.

Patent No. 5157020

However, although the shoe described in Patent Document 1 has a hard buried part in the midsole and is highly stable, the shoe may have a feeling of pushing up depending on the user's preference. Therefore, there is a need to improve stability by means different from those in Patent Document 1.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a shoe that further improves stability.

According to a first aspect of the present invention, the invention includes an outsole having a contact surface, a midsole fixed on the outsole, and an upper coupled to the midsole along the periphery of the midsole. has a bulge at a position corresponding to the rear foot on the medial side, and the bulge is located horizontally between the joining part of the upper and midsole to the outer edge of the ground contact surface when viewed from above. It has a bulge length L1 measured in distance, the bulge length L1 being longer than the horizontal length L2 from the upper-midsole connection at the rearmost end to the outer edge of the midsole.

A different aspect of the invention includes an outsole having a contact surface, a midsole fixed on the outsole, and an upper coupled to the midsole along the periphery of the midsole, the outsole comprising: A bulge is provided at a position corresponding to the rear foot on the medial side, and the bulge is measured as the horizontal distance from the joint between the outsole and midsole to the outer edge of the ground contact surface when viewed from above. The bulging length L1 is longer than the horizontal length L2 from the joining portion of the upper and midsole to the outer edge of the midsole at the rearmost end.

It is a top view showing the skeleton of a foot. FIG. 2 is a side view of a shoe according to an embodiment. FIG. 2 is a bottom view of the shoe according to the embodiment. 1 shows a cross-sectional view of a shoe according to an embodiment. 1 shows a cross-sectional view of a shoe according to an embodiment. 1 shows a cross-sectional view of a shoe according to an embodiment. FIG. 1 is a schematic cross-sectional view of a midsole of a shoe according to an embodiment. FIG. 1 is a schematic cross-sectional view of a midsole of a shoe according to an embodiment. FIG. 2 is a side view of a shoe according to an embodiment. FIG. 2 is a top view of an outsole and a midsole according to an embodiment. FIG. 2 is a top view of a midsole according to an embodiment. FIG. 2 is a bottom view of a midsole and an outsole according to an embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the embodiment. FIG. 3 is a cross-sectional view of a shoe according to a second embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the second embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the second embodiment. FIG. 7 is a sectional view of a shoe according to a modification of the second embodiment.

First, definitions of terms used in this specification will be explained. In this specification, front-rear direction, width direction, and up-down direction are sometimes used as terms indicating directions. Shows the direction seen from the point of view. Therefore, the front direction means the toe side, and the rear direction means the heel side. In addition, medial foot side and lateral foot side are sometimes used as terms to indicate direction, but medial foot side means the medial side in the width direction of the foot, that is, the side where the longitudinal arch of the foot is located, and The foot side means the side opposite to the medial foot side in the width direction.

In addition, in the following explanation, the outer edges of the midsole and outsole of shoes may be referred to, but the outer edge of the midsole or outsole refers to the outer edge of the projected shape when the midsole or outsole is viewed from above, respectively. means. Further, in the following description, the outside (direction) or inside (direction) of the midsole may be referred to. The outside of the midsole refers to any direction away from the plane of the midsole when the midsole is viewed from above. The inside of the midsole means any direction from the outside of the midsole toward the inside of the midsole when the midsole is viewed from above. Furthermore, in some examples, three-dimensional Cartesian coordinates may be used to describe directions. In this case, the X axis extends from the inner foot side to the outer foot side, the Y axis extends from the heel side to the toe side, and the Z axis extends from the bottom side to the upper side.

Furthermore, before explaining the shoes according to the embodiment, the skeleton of the foot that may be related to the shoes according to the embodiment will be explained with reference to FIG. 1.

FIG. 1 is a top view showing the skeleton of the foot. The human foot is mainly composed of cuneiform bones Ba, cuboid bones Bb, navicular bones Bc, talus Bd, calcaneus Be, metatarsals Bf, and phalanges Bg. The joints of the foot include MP joint Ja, Lisfranc joint Jb, and Chopard joint Jc. The Chopard joint Jc includes a calcaneocuboid joint Jc1 formed by the cuboid bone Bb and the calcaneus Be, and a talonavicular joint Jc2 formed by the navicular bone Bc and the talus Bd. The "forefoot" of the wearer as used herein refers to the part in front of the MP joint Ja, and refers to 0 to about 30% of the total length of the foot as measured from the toe side. Furthermore, "midfoot" refers to the area from MP joint Ja to Chopard joint Jc, and refers to approximately 30 to 80% of the total length of the foot when measured from the toe side. Furthermore, "hindfoot" refers to the part behind the Chopard joint Jc, and refers to approximately 80 to 100% of the total length of the foot as measured from the toe side. Further, in FIG. 1, a center line S indicates the center line of the shoe, and extends along the center portion in the width direction of the foot. The center line S is assumed to be located on a straight line passing through the third metatarsal Bf3 of the human body and the medial projection Be1 of the calcaneal eminence of the calcaneus Be. FIG. 1 shows the range where the medial process Be1 of the calcaneus eminence is assumed to be located.

FIG. 2 is a side view of the shoe. FIG. 2 is a side view of one shoe viewed from the medial side. As shown in FIG. 2, the shoe 1 includes an upper 2 that mainly covers the instep of the foot, a midsole 4 to which the upper 2 is connected, and an outsole 6 that has a contact surface that contacts the ground when walking. ing.

The upper 2 has a shape that covers the upper side of the instep of the foot. The upper 2 includes an upper main body 2a, an upper tightening means (tightening structure) 2b, and a slit 2c extending in the front-rear direction of the upper 2 near the center in the width direction of the upper 2. Further, a shoe tongue 2d is attached to the upper 2. In this embodiment, a structure of a combination of eyelets and shoelaces is employed as the tightening means 2b, but a hook-and-loop fastener or the like may also be used as the tightening means.

The upper main body 2a is formed of, for example, a mesh material knitted with synthetic fibers such as polyester or polyurethane, synthetic leather, or natural leather, and has a shape that covers the instep of the foot. The slit 2c is a buffer portion for adjusting the width of the upper main body 2a depending on the tightness of the shoelaces. A plurality of eyelets are provided on both sides of the slit 2c in the width direction. The tongue 2d of the shoe is exposed from the slit, and prevents the shoelace from coming into contact with the top of the wearer's foot when the shoelace is attached.

FIG. 3 is a bottom view of the shoe. As shown in FIG. 3, the outsole 6 is formed, for example, by molding rubber into a predetermined shape. The outsole 6 is attached to the bottom surface of the midsole 4 so as to at least partially cover the bottom surface of the midsole 4. The outsole 6 has a ground contact surface that contacts the ground. A predetermined uneven pattern is formed on the surface of the ground plane, and the uneven pattern improves grip.

In the example shown in FIG. 3, the outsole 6 is formed by pasting a plurality of island-shaped portions at predetermined positions on the bottom surface of a predetermined midsole. The ground plane is formed by the bottom surfaces of a plurality of island-like parts, and the bottom surface of the midsole 4 is exposed between the island-like parts. Therefore, in the illustrated example, the ground plane does not form one continuous surface, but is formed by a plurality of surfaces. Note that the outsole 6 may be formed from a single flat sheet-like member. In this case, the bottom surface of the sheet-like member forms the ground plane.

The midsole 4 plays a role of absorbing shock, and is formed of a material that absorbs shock, such as foamed EVA, foamed urethane, GEL, and cork. The midsole 4 has a planar shape that mimics the projected shape of the foot when viewed from above. The upper surface of the midsole 4 has an uneven shape corresponding to the uneven shape of the sole of the foot. Further, the upper 2 is coupled to the upper surface of the midsole 4. More specifically, the upper 2 is coupled along the outer edge of the midsole 4 or slightly inside the midsole 4 than the outer edge. As a means for joining the upper 2 to the midsole 4, there is a method of sewing the edge of the upper 2 to the midsole 4, or joining using a joining means such as an adhesive. The shape and thickness of the midsole 4 can be set as appropriate depending on the intended use of the shoe.

4 to 6 show cross-sectional views of the shoe. More specifically, FIG. 4 is a cross-sectional view taken along the line 4-4 in FIG. 2, FIG. 5 is a cross-sectional view taken along the line 5-5 in FIG. 2, and FIG. 6 is a cross-sectional view taken along the line 6-6 in FIG. It is. The cross-sectional views in FIGS. 4 to 6 are cross-sectional views of the vicinity of the rear foot, and are all cross-sectional views viewed from the heel side to the toe side. 7 and 8 are schematic sectional views of the midsole, and both are sectional views viewed from the heel side to the toe side.

As shown in FIGS. 4 to 6, the midsole 4 includes a bulge portion 8 that bulges outward. The bulging portion 8 is formed, for example, by making the side surface of the midsole 4 into a flared shape that spreads outward from the upper side toward the lower side. By providing the bulging portion 8, so-called overpronation can be suppressed. In order to suppress overpronation to the maximum extent possible, the bulge 8 should be placed at least in the part corresponding to the hindfoot on the medial side, or only in the part corresponding to the hindfoot on the medial foot side. It is preferable to provide one. Such a bulge 8 may be formed of the same material as the portions of the midsole 4 other than the bulge 8, and may have the same hardness. Further, the bulging portion 8 may be formed of a different material from the portion of the midsole 4 other than the bulging portion, and the hardness may be made different between the bulging portion 8 and the portion other than the bulging portion 8. For example, as shown in FIGS. 4 to 6, if the hardness of the bulging portion 8 is H1 and the hardness of the portion other than the bulging portion 8 is H2, H1>H2 can be satisfied. With such a configuration, it is possible to suppress the feeling of thrusting while improving stability. In such a case, it is preferable that the midsole 4 be formed by two-color molding, and the bulging portion 8 and the portion other than the bulging portion 8 be integrally molded. Alternatively, the bulging portion 8 may be manufactured separately from the midsole 4, and these may be joined together.

To explain from another perspective, when viewed from above, the outer edge 12 of the bottom surface of the midsole 4 is located outside of the joint 10 with respect to the joint 10 between the upper 2 and the midsole 4. It has a shape that allows it to be located. In the shoe 1 according to the embodiment, the bulging portion 8 is provided only in a portion corresponding to the rear foot portion on the inner foot side. In other embodiments, the bulging portion 8 may be provided only in the rear foot portion on the medial foot side and the forefoot portion on the medial foot side. In a further embodiment, the bulges 8 may be provided only on the medial rear foot, the medial forefoot, and the lateral forefoot. In a further embodiment, the bulge 8 may be provided in all parts other than the part corresponding to the landing area near the heel, which will be described later.

Here, the joining portion 10 between the midsole 4 and the upper 2, which is a criterion for determining whether the bulging portion 8 is provided, may differ depending on the method of joining the midsole 4 and the upper 2. In other words, when the midsole 4 and the upper 2 are sewn together, the midsole 4 and the upper 2 come into contact with each other in plane, and the joint portion 10 has a constant width. In this case, based on the contact point between the midsole 4 and the upper 2, if the outer edge 12 of the bottom surface of the midsole 4 is located outside the contact point between the midsole 4 and the upper 2, the midsole 4 This means that it has . The upper surface of the midsole 4 (the surface to which the upper 2 is coupled) can be considered to have a substantially flat shape even if it has some unevenness. On the other hand, the upper 2 has a curved shape that can wrap around the instep of the foot, as shown in FIGS. 4 to 6. Therefore, in the cross sections shown in FIGS. 4 to 6, there is a contact point where the flat midsole 4 and the curved upper 2 come into contact. With this contact point as a reference, the midsole 4 is shaped so that the outer edge 12 of the bottom surface of the midsole 4 is located outside of the contact point, thereby providing the midsole 4 with a bulging portion 8.

The height of the bulging portion 8 may match the height of the midsole 4 (see FIG. 7), or may be lower than the midsole 4 (see FIG. 8). Note that FIGS. 7 and 8 schematically show cross sections of the midsole for clarity, and in particular, the angles of the slopes are exaggerated. When the height of the bulging portion 8 and the height of the midsole 4 match, the bulging portion 8 will extend from the joining portion 10 of the midsole 4 and upper 2 in the XZ cross section, as shown in FIG. 7(a), for example. A shape that combines a horizontal plane that extends horizontally toward the outside of the midsole 4 along the XY plane, and a vertical plane that extends from the edge of the horizontal plane in a substantially vertical direction toward the bottom of the midsole 4 along the YZ plane. becomes. Further, as shown in FIG. 7(b), the bulging portion 8 has a vertical plane extending from the joining portion 10 between the midsole 4 and the upper toward the bottom surface of the midsole 4 along the YZ plane. It's okay. The vertical plane may have an inclination of approximately ±3° with respect to the vertical direction. Further, as shown in FIG. 8, when the height of the bulging part 8 and the height of the midsole 4 do not match, the bulging part 8 is In cross section, the shape is a combination of a vertical plane extending along the YZ plane from the midpoint in the height direction of the midsole 4 toward the bottom surface of the midsole 4 in a substantially vertical direction.

When the height of the bulging portion 8 is lower than the midsole 4, the bulging portion 8 has a shape that bulges out from an arbitrary position in the height direction of the midsole 4 toward the outside of the midsole 4. . For example, in the examples shown in FIGS. 4 to 6, the upper end of the bulge 8 is located in the middle of the midsole 4 in the height direction, and the bulge 8 spreads outward from the midsole 4 as it goes from the upper end to the bottom surface of the midsole 4. It has a shape. In this case, it is more preferable that the upper end of the bulge 8 be provided near the center of the midsole 4 in the height direction.

FIG. 9 is a side view of the shoe. FIG. 9 is a side view of the shoe as seen from the medial side, and the portion where the bulge is provided is hatched. In the example shown in FIG. 9, the bulge 8 extends continuously in the front-rear direction from the middle of the midfoot to the rear foot. The rear end of the bulge 8 is located in the middle of the rear foot and is set so as not to overlap the landing area, which will be described later. Furthermore, in the example shown in FIG. 9, the height of the bulging portion 8 decreases toward the front. In the illustrated example, the upper side of the bulge 8 is inclined away from the upper end of the midsole 4 toward the front. In this way, the height of the bulge 8 may be changed depending on the region. In this case, the height of the bulge may be increased in the hindfoot where stability is particularly required, and may be decreased toward the front. Further, as a modification, the bulging portion 8 may have a discontinuous shape and may extend intermittently in the front-rear direction.

Depending on the shapes of the midsole 4 and outsole 6, the outer edge 12 of the midsole 4 may coincide with the outer edge 14 of the outsole 6 having a ground contact surface when viewed from above. Here, the expression that the outer edge 14 of the outsole 6 and the outer edge 12 of the midsole 4 match includes at least the following two patterns.

As a first pattern, the outsole 6 has a single sheet shape, and the sheet shape matches the planar shape of the midsole 4, so that when viewed from above, the outer edge 14 of the outsole 6 and the midsole 4 The outer edges 12 of the two coincide.

As a second pattern, when the outsole 6 is formed by a plurality of island-like parts, a part of the outer edge 12 of the midsole 4 may coincide with a part of the outer edge 14 of at least one island-like part. Bye. FIG. 10 is a top view of the outsole 6 and midsole 4. In FIG. 10, a chain line indicates the outer edge 14 of the outsole 6, a chain double-dot line indicates the outer edge 12 of the midsole 4, and a solid line indicates the portion where the outer edges 12, 14 of the outsole 6 and the midsole 4 coincide. show. As shown in FIG. 10, only a portion of the outer edge 14 of the island-shaped outsole 6 in the outward direction coincides with a portion of the outer edge 12 of the midsole 4. As shown in FIG.

In addition, the horizontal bulge length L1 (L1>0) of the bulge 8 is defined as the length L1 (L1>0) of the bulge 8 from the joint 10 of the upper 2 and midsole 4 where the bulge 8 is not provided to the outer edge of the midsole 4. It is longer than the horizontal length L2 (L2≧0) up to 12. A detailed explanation will be given below with reference to FIG.

FIG. 11 is a top view of the midsole. The bulging length L1 of the bulging portion 8 is the distance in the horizontal direction from the connecting portion 10 between the upper 2 and the midsole 4 to the outer edge 14 of the ground contact surface. Note that when the outer edge 14 of the ground contact surface and the outer edge 12 of the midsole 4 match as described above, the bulge length L1 of the bulge portion 8 is determined by the connection between the upper 2 and the midsole 4. It can also be expressed as the distance from the portion 10 to the outer edge 12 of the midsole 4. On the other hand, the horizontal length L2 of the portion where the bulging portion 8 is not provided is the distance in the horizontal direction from the joining portion 10 of the upper 2 and the midsole 4 to the outer edge 12 of the midsole 4. The horizontal length L2 may be measured at any part where the bulge 8 is not provided. The bulge length L1 and the horizontal length L2 may change depending on the shape of the midsole 4 and the shape of the coupling portion 10. In this case, it is preferable to take the bulge length L1 and the horizontal length L2 at the position where the horizontal distance is the largest, respectively, and compare the two. Further, the horizontal length L3 (L3≧0) on the outer foot side is the distance in the horizontal direction from the joint 10 between the upper 2 and the midsole 4 on the outer foot side to the outer edge 14 of the ground contact surface.

Although various measurement methods may be used to measure the bulge length L1 and the horizontal lengths L2 and L3, basically they may be measured using the same standard. As an example, the bulge length L1 and the horizontal lengths L2, L3 can be measured along the YZ plane at the location of the outer edge 12 of the midsole 4. Further, as an example, the bulge length L1 and the horizontal lengths L2 and L3 can be measured along the YZ plane at the position of the coupling portion 10. As an example, an arbitrary point is taken at a position along the center line S in the hindfoot, a line is drawn from the point toward the outer edge of the midsole, and the bulge length L1 and the horizontal length L2 are drawn along the line. , L3 may be measured. The bulge length L1 of the bulge 8 is longer than the horizontal lengths L2 and L3 from the joint 10 of the upper 2 and midsole 4 to the outer edge 12 of the midsole 4 in the part where the bulge 8 is not provided. long.

Note that cases where the outer edge of the midsole 4 and the outer edge of the outsole 6 do not match include cases where the outer edge 12 of the midsole 4 is closer to the medial foot than the outer edge 14 of the ground contact surface, and the outer edge 12 of the midsole 4 does not match the outer edge of the outsole 6. may be located closer to the outer foot than the outer edge 14 of the ground contact surface. In the former case, the bulge length L1 and the horizontal length L2 are determined in the horizontal direction from the joint 10 between the upper 2 and the midsole 4 to the outer edge 12 of the midsole 4, regardless of the position of the outer edge 14 of the ground contact surface. It may also be a distance. In the latter case, the bulge length L1 and horizontal length L2 are determined from the joint 10 of the upper 2 and midsole 4 to the outer edge 14 of the ground contact surface, regardless of the position of the outer edge 12 of the midsole 4. It may also be a horizontal distance.

FIG. 12 is a bottom view of the midsole and outsole. As described above, it is preferable that the bulging portion 8 is not provided in a portion corresponding to the landing area 16 near the heel portion. Therefore, the portion where the bulging portion 8 is not provided is preferably a portion corresponding to the landing area 16 near the heel, and the horizontal length L2 is the portion corresponding to the landing area 16 near the heel. Preferably, it is measured. Furthermore, if the bulge 8 is not provided on the outer foot side, the horizontal length L2 may be measured at any position on the outer foot side.

The landing area 16 near the heel is the area of the bottom surface of the shoe 1 that comes into contact with the ground first when the user lands from the heel, and can be set as appropriate depending on the intended use of the shoe 1. For example, in running shoes, it is known that the thickness of the midsole 4 is gradually reduced toward the heel in a region rearward of an imaginary line VL1 that crosses the vicinity of the calcaneus in the width direction, as shown in FIG. . Thereby, the heel side and/or the outer foot side are inclined upward with respect to the horizontal direction in the vicinity of the heel, thereby forming an inclined surface (landing area 16). By forming such an inclined surface, the impact upon landing is alleviated. Based on such technology, the shoe 1 according to the embodiment does not have the bulge 8 in the part corresponding to the landing area 16, but has the bulge 8 in the part other than the part corresponding to the landing area 16. There is. By not providing the bulge 8 in the portion corresponding to the landing area 16, the bulge 8 does not interfere with the grounding operation when landing. When the bulge 8 is not provided in the landing area 16, the horizontal length L2 is preferably measured at a portion corresponding to the landing area 16, particularly at the rearmost portion on the heel side.

Furthermore, the virtual line defining the landing area 16 may be a virtual line VL2 inclined in the front-rear direction instead of the virtual line VL1 described above. The imaginary line VL2 is an imaginary line where the outer foot side is further forward, the inner foot side is more rearward, and is inclined when viewed from above. The inclination angle of the virtual line VL2 can be set arbitrarily, and can be set at an angle greater than 0 degrees and up to about 45 degrees with respect to the virtual line VL1.

Further, the structure for defining the landing area is not limited to sloping the bottom surface of the midsole 4, and the landing area 16 may be defined by the arrangement of a plurality of outsoles 6 arranged in an island shape. In this case, for example, the outsole 6 is not formed along the virtual line VL1 or VL2, but is formed in the front-rear direction of the virtual line VL1 or VL2. Thereby, a line in which the bottom surface of the midsole 4 is exposed can be formed between the outsoles 6 along the virtual line VL1 or the virtual line VL2 (see, for example, FIG. 3). This line is the part where the surface of the midsole 4 is exposed when the shoe 1 is viewed from the bottom, and has higher flexibility than the part where the outsole 6 is formed. Therefore, the rear side of this line may be defined as the landing area 16, and the bulging part 8 may not be provided in the part corresponding to this landing area 16, but the bulging part 8 may be provided in other parts.

Further, it is preferable that the midsole has constant hardness at least in a portion corresponding to the rear foot, particularly in a portion located below the calcaneus when worn. In order to suppress overpronation, it is possible to increase the hardness near the end of the midsole on the medial foot side compared to other parts of the midsole to suppress the foot from falling toward the medial foot side when landing. However, when the midsole has a difference in hardness, there is always a boundary between a high hardness part and a low hardness part. If the boundary is located at a position where it overlaps with the sole of the foot when viewed from above, the particularly high hardness portion will give the wearer a so-called pushing up feeling. On the other hand, in the shoes according to the present embodiment, overpronation can be suppressed by the bulge, so that overpronation can be suitably suppressed even if the hardness of the midsole is kept constant.

13 to 19 are cross-sectional views of the shoe, and more specifically, they are views showing modified examples of the cross-sectional shape of the bulge.

In the modification shown in FIG. 13, the bulging portion 8 extends in a flare shape from the top surface of the midsole 4 toward the bottom surface, and has a gentle inclination angle at an inflection point provided midway in the height direction of the midsole 4. It extends into a flared shape. In the modification shown in FIG. 14, the bulging portion 8 extends from the middle of the midsole 4 in the height direction toward the medial foot side, and extends from there in a flare shape toward the bottom surface. In the modification shown in FIG. 15, the bulging portion 8 has a curved shape and bulges toward the medial foot side from the middle of the midsole 4 in the height direction. In the example shown in FIG. 16, the bulging portion 8 has a curved shape and bulges toward the medial foot side from a low position in the height direction of the midsole 4.

In the modification shown in FIGS. 17 to 19, in addition to the bulge 8, a part of the midsole 4 other than the bulge 8 is formed of a high hardness material. In these modified examples, a portion continuous with the bulging portion 8 is formed of a high hardness material, and the remaining portion is formed of a low hardness material. Note that in FIGS. 17 to 19, for clarity, portions made of high-hardness material are hatched. In the modification shown in FIG. 17, the bulge 8 has the same shape as the bulge shown in FIG. Furthermore, in the example shown in FIG. 17, the bulging portion 8 has a high hardness material portion having a line-symmetrical shape with respect to the boundary line between the bulging portion 8 and the portion of the midsole 4 other than the bulging portion 8. are doing. In the modification shown in FIG. 18, the bulging portion 8 is formed over the entire length of the midsole 4 in the height direction. This example also has a high-hardness material portion having a line-symmetrical shape with the bulge portion 8. In the modification shown in FIG. 19, the bulging portion 8 is formed over the entire length of the midsole 4 in the height direction, and is curved toward the medial foot side. This example also has a high-hardness material portion having a line-symmetrical shape with the bulge portion 8. In either case, the high-hardness material portion extends inward of the midsole only to a position where it hardly overlaps with the calcaneus when viewed from above. In particular, in the example shown in FIG. 17, the high-hardness material portion extends to a position that partially overlaps the calcaneus when viewed from above. However, as in the example shown in FIG. 17, even if the high-hardness material portion is extended inwardly of the midsole 4 at a lower position in the height direction of the midsole 4, the feeling of pushing up can be suppressed. Therefore, when extending the high-hardness material portion toward the inner side of the midsole 4, it is preferable to extend only the lower side in the height direction so that only the upper side in the height direction does not overlap with the calcaneus. In this case, it is more preferable to provide the high hardness material portion below the center in the height direction, for example. Furthermore, in order to suitably prevent the feeling of pushing up, it is more preferable that the high-hardness material part does not have an upwardly angular shape at the position where it overlaps with the calcaneus. Such a high hardness material portion can suppress the feeling of pushing up. Note that the high hardness material portion does not necessarily have to have a shape that is line symmetrical to the bulged portion 8.

As described above, by providing the bulging portion 8 at a position corresponding to the rear foot on the medial foot side, the shoe according to the embodiment can firmly support the medial foot side when landing and suppress overpronation. This can improve stability. Furthermore, by not providing the bulge 8 in the landing area 16, it is possible to prevent the bulge 8 from interfering with the landing motion.

Next, a second embodiment of the shoe will be described. In the embodiment described above, the bulge is provided on the midsole, but in the second embodiment, the bulge is provided on the outsole.

FIG. 20 is a cross-sectional view of the shoe. As shown in FIG. 20, the outsole 22 of the shoe 20 has a rolled-up portion 24, and a bulge 26 is formed in the rolled-up portion 24. The winding portion 24 is formed by a peripheral wall rising upward from the outer edge of the outsole 22. More specifically, the rolled up portion 24 extends upward from the outer edge of the outsole 22. The rolled-up portion 24 improves the rigidity of the shoe 20. The rigidity of the shoe 20 refers to bending rigidity and torsional rigidity. The position of the upper end of the winding portion 24 can be changed as appropriate depending on the use of the shoe 20.

The height of the winding portion 24 may be uniform or may vary depending on the position. For example, if rigidity is required on the toe side, the rolled up portion 24 may be lower on the heel side and higher on the toe side, or the height may be changed on the inside and outside in the width direction.

The bulging portion 26 is formed by giving the side surface of the outsole 22 a flared shape that widens outward from the upper side toward the lower side. Such a bulging portion 26 can also suppress so-called overpronation. The winding portion 24 may be formed around the entire circumference of the outsole 22 along the outer edge of the outsole 22, or may be formed only at a portion along the outer edge of the outsole 22. The bulging portion 26 may be formed in all of the rolled up portions 24 along the outer edge of the outsole 22, or may be formed only in some portions. The bulging portion 26 may be provided only in a portion corresponding to the rear foot portion on the medial foot side. In other embodiments, the bulging portion 26 may be provided only in the rear foot portion on the medial side and the forefoot portion on the medial foot side. In a further embodiment, the bulges 26 may be provided only on the medial hindfoot, the medial forefoot, and the lateral forefoot. In a further embodiment, the bulge 26 may be provided in all parts other than the part corresponding to the landing area near the heel.

The height of the bulging portion 26 may match the height of the rolled-up portion 24 or may be lower than the rolled-up portion 24. As an example, as shown in FIG. 20, the height of the rolled-up portion 24 and the height of the midsole 28 may match, and further, the height of the bulged portion 26 and the height of the rolled-up portion 24 may match. In this case, the bulging portion 26 has a horizontal surface extending along the XY plane from the upper end of the rolled-up portion 24 toward the outside of the midsole 28, and an end of the horizontal surface in a YZ cross section perpendicular to the bulging direction of the bulging portion 26. It has a shape that combines the vertical plane extending from the vertical plane toward the bottom surface of the midsole 28 along the YZ plane.

21 to 23 are cross-sectional views of the shoe, showing modified examples of the bulge. As shown in FIG. 21, when the height of the rolled-up portion 24 and the height of the midsole 28 match and the height of the bulged portion 26 is lower than the height of the rolled-up portion 24, the bulged portion 26 The winding portion 24 has a shape that bulges outward from an arbitrary position in the height direction. As an example, as shown in FIG. 22, the height of the rolled-up portion 24 may be lower than the height of the midsole 28, and the height of the bulged portion 26 and the height of the rolled-up portion 24 may match. In this case, the bulging portion 26 has a horizontal surface extending along the XY plane from the upper end of the rolled-up portion 24 toward the outside of the midsole 28, and an end of the horizontal surface in a YZ cross section perpendicular to the bulging direction of the bulging portion 26. The shape is a combination of a vertical plane extending from the vertical plane substantially along the YZ plane toward the bottom surface of the outsole 22. As shown in FIG. 23, when the height of the rolled-up portion 24 is lower than the height of the midsole 28 and the height of the bulged portion 26 is lower than the height of the rolled-up portion 24, the bulged portion 26 is lower than the height of the rolled-up portion 24. The winding portion 24 has a shape that bulges outward from an arbitrary position in the height direction of the winding portion 24 .

Also in the second embodiment, by providing the bulge 26, the inner foot side can be firmly supported when landing, and overpronation can be suppressed. This can improve stability. Further, by not providing the bulge 26 in the landing area, it is possible to prevent the bulge 26 from interfering with the landing motion.

The embodiments of the present invention have been described above. Note that each configuration of the embodiment can be modified as appropriate without departing from the spirit of the invention as set forth in the claims.

Hereinafter, aspects of the present invention that can be derived from the invention described in the claims will be explained.

The first aspect includes an outsole having a contact surface, a midsole fixed on the outsole, and an upper coupled to the midsole along the periphery of the midsole, and the midsole is connected to the medial foot side. A bulge is provided at a position corresponding to the rear foot, and the bulge is measured as the horizontal distance from the joint between the upper and midsole to the outer edge of the ground contact surface when viewed from above. It has a bulge length L1, and the bulge length L1 is longer than the horizontal length L2 from the joining portion of the upper and midsole at the rearmost end to the outer edge of the midsole.

In the second aspect, in the first aspect, the midsole has constant hardness at least in the portion supporting the calcaneus.

In a third aspect, in the first or second aspect, the hardness of the bulge is higher than the hardness of the portion of the midsole other than the bulge.

In a fourth aspect, in the aspect described in any one of the first to third aspects, the bulging portion is formed from the joint surface of the midsole and the outsole to the middle of the midsole in the height direction.

In a fifth aspect, in the aspect described in any one of the first to fourth aspects, the side surface of the bulge on the medial foot side has a shape that moves away from the coupling portion as it goes toward the ground contact surface.

In a sixth aspect, in the aspect described in any one of the first to fifth aspects, the midsole is molded in two colors.

In a seventh aspect, in the aspect described in any one of the first to sixth aspects, the bulging portion is formed only in the rear foot portion on the medial foot side.

In an eighth aspect, in the aspect described in any one of the first to sixth aspects, the bulging portion is formed at a location other than the outer periphery of the landing area near the heel portion of the ground contact surface.

A ninth aspect includes an outsole having a contact surface, a midsole fixed on the outsole, and an upper coupled to the midsole along the periphery of the midsole, and the outsole is connected to the medial foot side. A bulge is provided at a position corresponding to the rear foot, and the bulge is a bulge measured by the horizontal distance from the joint between the outsole and midsole to the outer edge of the ground contact surface when viewed from above. It has a protrusion length L1, and the protrusion length L1 is longer than the horizontal length L2 from the joining portion of the upper and midsole to the outer edge of the midsole at the rearmost end.

INDUSTRIAL APPLICATION This invention can be utilized for shoes.

1 shoes, 2 upper, 4 midsole, 6 outsole, 8 bulge, 10 joint, 12, 14 outer edge, 16 landing area, 20 shoe, 22 outsole, 26 bulge, 28 midsole

Claims (5)

an outsole with a contact surface;
a midsole fixed on the outsole;
an upper coupled to the midsole along the periphery of the midsole;
The midsole includes a bulge having the same hardness as other parts of the midsole at a position corresponding to the rear foot on the medial side,
The height of the bulge is the same as the height of the center of the rear foot of the midsole,
The outer edge of the midsole in the bulge portion bulges out toward the medial foot than the outer edge of the ground contact surface,
The bulge has a bulge length L1 measured as a horizontal distance from a joint between the upper and the midsole to an outer edge of the midsole when viewed from above,
The bulge length L1 is longer than the horizontal length L2 from the joint between the upper and the midsole to the outer edge of the midsole in a predetermined portion where the bulge is not provided . The shoe according to claim 1, wherein the midsole has constant hardness at least in a portion supporting the calcaneus. The shoe according to claim 1 or 2 , wherein the midsole is molded in two colors. The shoe according to any one of claims 1 to 3 , wherein the bulging portion is formed only in the rear foot portion on the inner foot side. The shoe according to any one of claims 1 to 4 , wherein the bulge is formed at a location other than the outer periphery of the landing area near the heel of the ground contact surface.

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