JP7454602B2 - shoes - Google Patents

Description

The present disclosure relates to shoes.

BACKGROUND ART Conventionally, shoes such as those disclosed in Patent Document 1, for example, have been proposed as shoes that allow the strength of pressure transmitted to various parts of the sole to be recognized.

Patent Document 1 discloses a sole that supports the entire sole of a wearer's foot, a plurality of lower protrusions that protrude downward from the lower part of the sole toward the road surface and are spaced apart from each other, and an upper part of the sole. A shoe is disclosed that includes a plurality of upper convex portions that protrude upwardly toward the sole side of the wearer's foot and are each disposed at a position above the sole and overlap with each lower convex portion. The plurality of lower convex portions and the plurality of upper convex portions are arranged over the entire area of the sole in bottom view and plan view.

JP2019-63491A

In the shoe of Patent Document 1, the reaction force received from the road surface is transmitted to the plurality of lower convex parts, and the reaction force is directly applied to the sole of the wearer's foot from each lower convex part via each upper convex part. transmitted to. This allows the wearer to recognize the strength of pressure transmitted to various parts of the sole of the foot in each part of the entire sole.

By the way, when a wearer exercises, a load is likely to be applied to the sole of the shoe at a position corresponding to the forefoot of the wearer's foot. Therefore, it is important to concentrate the pressure transmitted from the lower protrusion and the upper protrusion on the forefoot of the wearer's foot.

However, in the shoe of Patent Document 1, since the plurality of lower convex portions and the plurality of upper convex portions are arranged over the entire area of the sole, the pressure transmitted from the plurality of lower convex portions and the plurality of upper convex portions is , which will be dispersed throughout the sole of the wearer's feet. That is, with the shoes described above, it is difficult to concentrate the pressure on the forefoot of the wearer's foot.

The present disclosure has been made in view of the above, and its purpose is to relatively enhance the sensation of pressure on the forefoot of the wearer's foot.

To achieve the above object, the first disclosure relates to a sole for a shoe, the sole comprising a sole body and a position in the sole body corresponding to at least the forefoot of the wearer's foot. , a plurality of lower convex portions each protruding toward the lower side of the sole body; and a plurality of lower convex portions each protruding toward the upper side of the sole body, each of which is arranged at a position corresponding to the forefoot of the wearer 's foot in the sole body; It is provided with a plurality of upper convex portions that protrude and overlap with each of the plurality of lower convex portions in cross-sectional view, forming a pair of upper and lower convex portions. The sole body is configured such that the stiffness from the position corresponding to the Lisfranc joint to the Chopard joint of the wearer's foot is higher than the stiffness of the part corresponding to the forefoot of the wearer's foot. There is. In addition, the upper surface of the sole body (excluding the upper for covering the wearer's foot) located at the rear of the position corresponding to at least the Lisfranc joint of the wearer's foot is from the medial instep side to the lateral instep side. The entire width of the foot is substantially flat throughout the width of the foot.

In the first disclosure, each upper convex portion forms a pair of upper and lower portions so as to overlap each lower convex portion in a cross-sectional view. Therefore, the reaction force received from the road surface is transmitted to the lower convex portion, and the reaction force is directly transmitted from each lower convex portion to the sole of the foot via each upper convex portion. This allows the wearer to recognize the strength of the pressure transmitted to various parts of the sole of the foot. The sole body is configured such that the rigidity of the portion from the position corresponding to the Lisfranc joint to the Chopard joint of the wearer's foot is higher than the rigidity of the portion corresponding to the forefoot. With this configuration, so-called shank folding is less likely to occur, and the pressure transmitted from the lower convex portion and the upper convex portion is easily transmitted to the sole of the wearer's forefoot in a timely manner. Therefore, in the first disclosure, it is possible to relatively increase the wearer's sensation of pressure on the forefoot.

The second disclosure relates to a sole for a shoe, the sole having a sole body and a position in the sole body corresponding to the forefoot of the wearer 's foot, each of which is located below the sole body. A plurality of lower convex portions protrude toward the sides, each of which is arranged at a position corresponding to at least the forefoot of the wearer's foot in the sole body, and each protrudes toward the upper side of the sole body and has a plurality of lower convex portions in cross-sectional view. A plurality of upper convex portions are provided, forming a pair of upper and lower portions so as to overlap each of the side convex portions. The sole body is configured such that a portion corresponding to the midfoot of the wearer's foot has a higher rigidity than a portion corresponding to the forefoot of the wearer's foot. The upper surface of the sole body (excluding the upper for covering the wearer's foot), which corresponds to the midfoot and rear foot of the wearer's foot , extends from the medial instep side to the lateral instep side. It is formed substantially flat over the entire width of the foot .

In the second disclosure, each upper convex portion forms a pair of upper and lower portions so as to overlap each lower convex portion in a cross-sectional view. Therefore, the reaction force received from the road surface is transmitted to the lower convex portion, and the reaction force is directly transmitted from each lower convex portion to the sole of the foot via each upper convex portion. This allows the wearer to recognize the strength of the pressure transmitted to various parts of the sole of the foot. The sole body is configured such that the rigidity of the portion corresponding to the midfoot of the wearer's foot is higher than the rigidity of the portion corresponding to the forefoot. With this configuration, so-called shank folding is less likely to occur, and the pressure transmitted from the lower convex portion and the upper convex portion is easily transmitted to the sole of the wearer's forefoot in a timely manner. Therefore, in the second disclosure, the wearer's experience of pressure on the forefoot region can be relatively enhanced.

Furthermore, in this second disclosure, the upper surface of the sole body at positions corresponding to the midfoot and rearfoot of the wearer's feet is formed into a substantially flat shape, and is provided with an upper convex portion. Not yet. That is, stress is difficult to concentrate on the upper surface. This makes it possible to increase the bending rigidity of the portions of the sole corresponding to the midfoot and rearfoot portions compared to the portions of the sole corresponding to the forefoot. As a result, shank breakage can be suppressed.

A third disclosure is a shoe comprising the sole of the first or second disclosure .

According to the third disclosure, it is possible to obtain shoes that exhibit the same effects as those of the first or second disclosure.

As described above, according to the present disclosure, it is possible to relatively increase the sensation of pressure on the forefoot of the wearer's foot.

FIG. 1 is an overall perspective view showing a shoe according to a first embodiment. FIG. 2 is a perspective view of the sole according to the first embodiment viewed from above on the medial instep side. FIG. 3 is a plan view of the sole according to the first embodiment. FIG. 4 is a plan view schematically showing the sole according to the first embodiment together with the skeletal structure of the wearer's foot. FIG. 5 is a bottom view of the sole according to the first embodiment. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 3. FIG. 8 is a cross-sectional view showing the cross-sectional structure of the sole taken along the line VIII-VIII in FIG. 3 together with the skeletal structure of the wearer's foot. FIG. 9 is a view corresponding to FIG. 9 showing the cross-sectional structure of the sole according to the modification of the first embodiment together with the skeletal structure of the foot of the wearer. FIG. 10 is a view corresponding to FIG. 8 showing the cross-sectional structure of the sole according to the second embodiment together with the skeletal structure of the foot of the wearer. FIG. 11 is a graph showing the load ratio X in the forefoot region of the sole of each test specimen.

Hereinafter, each embodiment of the present disclosure will be described in detail based on the drawings. The following description of each embodiment is essentially only an example, and is not intended to limit the present disclosure, its applications, or its uses.

[First embodiment]
FIG. 1 shows the entire shoe S according to the first embodiment of the present disclosure. The shoes S are used, for example, as sports shoes for running or various competitions, sneakers for daily use, and shoes for rehabilitation.

Here, the shoes S are only shoes for the left foot. Since the right foot shoe is configured to be symmetrical with the left foot shoe, only the left foot shoe will be described in the following explanation, and a description of the right foot shoe will be omitted.

In addition, in the following explanation, upper side and lower side refer to the vertical positional relationship of the shoe S, and front (front side) and rear side (rear side) refer to the positional relationship of the shoe S in the foot length direction (front-back direction). The medial instep side and the lateral instep side represent the positional relationship of the shoe S in the foot width direction. Moreover, the "arch part of the foot" includes both the arch part on the medial instep side and the arch part on the lateral instep side of the wearer's foot f. Furthermore, the "midfoot region M" refers to a region extending from the position of the Lisfranc joint LF of the wearer's foot f to the position of the Chopard joint CP in the foot length direction (see FIGS. 4 and 8).

(upper)
As shown in FIG. 1, the shoe S includes an upper 10 for covering the wearer's feet f. Suitable materials for the upper 10 include knitted fabrics, woven fabrics, nonwoven fabrics, synthetic leather, artificial leather, and natural leather. The upper 10 is fixed, for example, to a peripheral edge 5 of a midsole 4, which will be described later, with an adhesive or the like.

A foot insertion part 11 for inserting the wearer's foot f is provided on the upper side of the upper 10. Further, an opening 12 is formed on the upper side of the upper 10 and communicates with the foot insertion portion 11 and extends in the front-rear direction. The opening 12 is provided with an eyelet decoration 13. A tongue portion 15 is provided on the front edge of the opening 12 to open or close the opening 12. As shown in FIG.

The eyelet decoration 13 is made of, for example, artificial leather. The eyelet decoration 13 is arranged in the upper 10 at a position corresponding to the instep of the wearer's foot f. The eyelet decoration 13 is fixed to the upper 10 by sewing or the like. Eyelet holes 14, 14, . . . are formed at the left and right edges of the eyelet decoration 13 at intervals in the foot length direction.

The upper 10 is provided with a shoelace 16. The shoelace 16 can be inserted into eyelet holes 14, 14, . . . located at the left and right edges of the eyelet decoration 13. By fastening both ends of the shoelace 16 located in the foot insertion portion 11, the upper 10 can be fitted to the instep of the wearer.

(sole)
As shown in FIGS. 1 to 3, the shoe S includes a sole 1. As shown in FIGS. The sole 1 has a sole body 2. The sole body 2 is composed of an outsole 3 and a midsole 4.

The outsole 3 is made of a hard elastic member that is harder than the midsole 4. Specifically, the material of the outsole 3 includes, for example, a thermoplastic resin such as ethylene-vinyl acetate copolymer (EVA), a thermosetting resin such as polyurethane (PU), or a rubber material such as butadiene rubber or chloroprene rubber. is suitable. The hardness of the outsole 3 is preferably set to, for example, 50A to 80A on the Asker A scale.

As shown in FIGS. 5 to 8, the outsole 3 is formed with a bottomed lower recess 3a that is recessed upward from the lower surface of the outsole 3 in cross-sectional view. The lower recess 3a is arranged over substantially the entire area of the outsole 3 when viewed from the bottom (see FIG. 5).

As shown in FIGS. 6 to 8, the midsole 4 is laminated on the upper side of the outsole 3 using, for example, an adhesive. The midsole 4 is made of a soft elastic material with lower rigidity than the outsole 3. Specifically, materials for the midsole 4 include thermoplastic synthetic resins and foams thereof such as ethylene-vinyl acetate copolymer (EVA), thermosetting resins such as polyurethane (PU) and foams thereof, and butadiene. Rubber materials such as rubber and chloroprene rubber, and their foams are suitable. Note that the hardness of the midsole 4 is preferably set to, for example, 15C to 65C on the Asker C scale.

As shown in FIGS. 3, 6, and 7, a peripheral edge part 5 for supporting the sole peripheral edge of the wearer's foot f is formed at the peripheral edge of the upper surface of the midsole 4. As shown in FIG. 6, between the peripheral edge part 5 located on the medial instep side and the peripheral edge part 5 located in the outer instep side, there is a recess that is recessed downward from the upper surface of the peripheral edge part 5 in cross-sectional view. A bottom-shaped upper recess 4a is formed. The upper recess 4a is arranged at a position corresponding to the forefoot F of the wearer's foot f in the midsole 4 in plan view (see FIG. 4).

(Lower convex part and upper convex part)
As shown in FIGS. 2 to 8, the sole 1 has a plurality of lower protrusions 7, 7, . . . and a plurality of upper protrusions 8, 8, . In this embodiment, the lower protrusions 7, 7, . . . are arranged in the sole 1 so as to correspond to the entire sole of the wearer's foot f (see FIG. 5). On the other hand, the upper protrusions 8, 8, . . . are arranged at positions corresponding to the forefoot F of the wearer's foot f on the sole 1 (see FIG. 4).

As shown in FIG. 5, the lower protrusions 7, 7, . . . are provided within the lower recess 3a of the outsole 3. As shown in FIG. Specifically, as shown in FIGS. 6 to 8, each lower protrusion 7 projects downward from the bottom surface of the lower recess 3a. Each lower convex portion 7 has, for example, a substantially rectangular shape in cross-sectional view. The lower protrusions 7, 7, . . . are formed to have different thicknesses and lengths.

As shown in FIGS. 2 to 4, the upper protrusions 8, 8, . . . are provided within the upper recess 4a of the midsole 4. As shown in FIGS. Specifically, as shown in FIGS. 6 and 8, each upper convex portion 8 projects upward from the bottom surface of the upper recess 4a. The upper end portion of each upper convex portion 8 has, for example, a substantially hemispherical shape. The upper protrusions 8, 8, . . . are formed to have different thicknesses and lengths, for example.

As shown in FIGS. 6 and 8, each upper convex portion 8 is arranged to be located directly above each lower convex portion 7 in the region of the forefoot F. That is, each upper convex part 8 forms a pair of upper and lower parts so as to overlap each lower convex part 7 located in the area of the forefoot F in a cross-sectional view.

(rigidity of sole body)
As a characteristic configuration of this embodiment, the sole main body 2 is configured such that the rigidity of the portion corresponding to the midfoot region M of the wearer's foot is higher than the rigidity of the portion corresponding to the forefoot region F. .

Specifically, the sole body 2 is preferably configured such that the bending rigidity value in the portion corresponding to the midfoot portion M is 0.258 Nm/deg or more. Note that the above-mentioned stiffness value is a value obtained when a bending test is conducted on the sole body 2 without the reinforcing body 9 described later.

Here, in order to confirm that the sole body 2 has the above-mentioned rigidity value, for example, the following measurement method (bending test) is suitable. That is, using a general-purpose flexure testing machine (not shown, such as "Shoe Flexer" by Exeter Research), the pressure sensor part of the tester was applied to the midfoot part of the sole body 2 where the reinforcing body 9, which will be described later, is not provided. It is fixed in a pressed state corresponding to M, and in this fixed state, the rear end portion of the sole body 2 is lifted up from a horizontal position to a predetermined angle (for example, 40 degrees). At this time, it is sufficient that the stiffness value output from the bending tester is 0.258 Nm/deg or more.

Further, in this embodiment, the upper surface of the midsole 4 at a position corresponding to the middle foot M and the rear foot H is formed into a substantially flat shape. That is, the upper convex parts 8, 8, . . . are not provided in the midsole 4 at least at a position corresponding to the middle foot part M. This makes it possible to relatively increase the rigidity of the portion of the sole body 2 corresponding to the midfoot portion M. By making the upper surface of the midsole 4 at the position corresponding to the middle foot part M substantially flat, the Young's modulus of the part of the midsole 4 corresponding to the middle foot part M becomes 0.75 MPa or more. is preferred. Note that the above-mentioned "substantially flat" includes not only a completely flat case, but also a case where it can be considered to be substantially flat, such as a case with a slight radius.

(Reinforcement body)
As shown in FIGS. 3 and 4, the sole body 2 is provided with a reinforcing body 9 for further increasing the rigidity of a portion corresponding to the wearer's middle foot M. The reinforcing body 9 is made of a thin layer that is harder than the outsole 3 and the midsole 4, and is preferably made of a hard elastic member.

Specific examples of the hard elastic member include thermoplastic resins such as thermoplastic polyurethane (TPU), polyamide elastomer (PAE), and ABS resin, and thermosetting resins such as epoxy resin and unsaturated polyester resin. Note that fiber-reinforced plastic (FRP) may be used, in which carbon fiber, aramid fiber, glass fiber, or the like is used as reinforcing fiber, and thermosetting resin or thermoplastic resin is used as matrix resin.

The reinforcing body 9 has a substantially trapezoidal shape in plan view. Specifically, the outer shape of the reinforcing body 9 has a substantially trapezoidal shape in which the length of the side located on the medial instep side is longer than the length of the side located on the lateral instep side in plan view. That is, the reinforcing body 9 is configured such that the position corresponding to the lateral arch of the wearer's foot has higher rigidity than the position corresponding to the lateral arch. There is.

As shown in FIGS. 4 and 8, the reinforcing body 9 is arranged in the sole body 2 at a position corresponding to the midfoot region M of the wearer's foot. That is, the reinforcing body 9 is arranged at a position rearward of the upper convex parts 8, 8, . . . in the foot length direction. The reinforcing body 9 extends in the foot length direction from a position corresponding to the Lisfranc joint LF of the wearer's foot f to a position corresponding to the Chopard joint CP in the sole body 2.

As shown in FIGS. 7 and 8, the reinforcing body 9 is formed into a substantially plate shape. In this embodiment, the thickness of the reinforcing body 9 is constant. The reinforcing body 9 is laminated between the outsole 3 and the midsole 4 in cross-sectional view. Specifically, the lower surface of the reinforcing body 9 is fixed to the upper surface of the outsole 3, while the upper surface of the reinforcing body 9 is fixed to the lower surface of the midsole 4. Note that the thickness of the reinforcing body 9 does not have to be constant.

[Operations and effects of the first embodiment]
As described above, each upper convex portion 8 forms a pair of upper and lower portions so as to overlap each lower convex portion 7 in cross-sectional view. Therefore, the reaction force received from the road surface is transmitted to the lower protrusions 7, 7, ..., and the reaction force is directly transmitted from each lower protrusion 7 to the upper protrusion 8 of the foot f. transmitted to the bottom. This allows the wearer to recognize the strength of the pressure transmitted to various parts of the sole of the forefoot F.

Generally speaking, when the sole of the shoe comes into contact with the road surface during exercise, the wearer's foot will be affected from the lateral instep side of the heel to approximately the center of the width of the foot in the rear and midfoot areas, as well as the medial side of the forefoot. A load trajectory (so-called load path) of weight transfer begins to occur, passing through the instep side and toward the toe side. In the above-mentioned load path, if the bending rigidity of the part of the sole corresponding to the midfoot part is relatively low, a phenomenon in which the part of the sole corresponding to the midfoot part breaks (i.e., "shank breakage") occurs. It becomes easier. If this shank breakage occurs, weight movement, particularly from the midfoot to the toe side, will be hindered during the load pass process. As a result, the timing of the weight shift toward the forefoot of the wearer's foot is delayed, making it difficult for the wearer's weight to be applied to the portion of the sole corresponding to the forefoot. As a result, in the shoe sole shown in the prior art (for example, Patent Document 1 mentioned above), the pressure transmitted from the lower convex portion and the upper convex portion is transmitted to the sole of the wearer's forefoot in a timely manner. It becomes difficult.

In contrast, the sole main body 2 of this embodiment is configured such that the portion corresponding to the midfoot portion M has a higher rigidity than the portion corresponding to the forefoot portion F. This configuration makes it difficult for the shank to break as described above. As a result, the timing of the weight shift particularly from the midfoot portion M to the forefoot portion F during the load path is not delayed, and the weight of the wearer is more likely to be applied to the portion of the sole 1 corresponding to the forefoot portion F. As a result, the pressure transmitted from the lower convex portions 7, 7, . . . and the upper convex portions 8, 8, . Therefore, in the sole 1 according to the first embodiment and the shoes S including the sole 1, the wearer's sensation of pressure on the forefoot F can be relatively enhanced.

Further, the sole body 2 is configured such that the bending rigidity value in the portion corresponding to the midfoot portion M is 0.258 Nm/deg or more. In this manner, by determining the lower limit of the bending rigidity of the portion of the sole body 2 corresponding to the midfoot portion M, it is possible to easily obtain a sole body 2 in which the shank does not easily break.

Further, the upper surface of the midsole 4 at a position corresponding to the midfoot portion M is formed substantially flat. That is, the lower convex portions 7, 7, . . . are not provided on the upper surface of the midsole 4 at a position corresponding to the midfoot portion M. That is, stress is difficult to concentrate on the upper surface. Thereby, the bending rigidity of the portion of the sole 1 corresponding to the midfoot portion M can be made higher than the bending rigidity of the portion of the sole 1 corresponding to the forefoot portion F. As a result, shank breakage can be suppressed.

Further, the midsole 4 is configured such that the Young's modulus of the portion corresponding to the midfoot portion M is 0.75 MPa or more. With this configuration, the bending rigidity of the portion of the sole 1 corresponding to the midfoot portion M is ensured to such an extent that shank bending can be suppressed. Therefore, the wearer's sensation of pressure on the forefoot F can be relatively enhanced.

Furthermore, the stiffness of the portion corresponding to the midfoot portion M of the sole body 2 is increased by the reinforcing body 9 provided at a position corresponding to the midfoot portion M of the sole body 2, and the stiffness of the portion corresponding to the forefoot portion F of the sole body 2. It is easier to increase the rigidity than that of As a result, shank breakage can be suppressed.

[Modification of the first embodiment]
Although the first embodiment described above shows a form in which the reinforcing body 9 is provided in the sole body 2, the present invention is not limited to this form. For example, as in the modification shown in FIG. 9, the reinforcing body 9 does not need to be provided on the sole body 2.

Even in such a modification, it is sufficient that the bending rigidity value of the portion of the sole body 2 corresponding to the midfoot portion M is 0.258 Nm/deg or more. Alternatively, the upper surface of the midsole 4 at a position corresponding to the midfoot portion M may be formed substantially flat. Alternatively, the Young's modulus of the portion of the midsole 4 corresponding to the midfoot portion M may be 0.75 MPa or more. That is, if the sole body 2 is configured such that the rigidity of the portion corresponding to the midfoot portion M is higher than the rigidity of the portion corresponding to the forefoot portion F, the wearer can The sensation of pressure on the forefoot F can be relatively increased.

[Second embodiment]
FIG. 10 shows a sole 1 according to a second embodiment of the present disclosure. In the second embodiment, the configuration of the sole 1 is different from the first embodiment. Note that the other configuration of the sole 1 according to the second embodiment is the same as the configuration of the sole 1 according to the first embodiment. Therefore, in the following description, the same parts as in FIGS. 1 to 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the sole body 2 is configured such that the thickness of the portion corresponding to the rear foot portion H is greater than the thickness of the portion corresponding to the forefoot portion M. In particular, in the sole body 2, it is preferable that the difference between the thickness of the portion corresponding to the rear foot portion H and the thickness of the portion corresponding to the forefoot portion F be set to 8 mm or more. Note that the sole body 2 of this embodiment is not provided with the reinforcing body 9 shown in the first embodiment.

Specifically, a heel support portion 20 is provided at a position corresponding to the rear foot portion H of the sole body 2 shown in the first embodiment. The heel support portion 20 is made of the same material as the midsole 4, for example. The heel support portion 20 is formed into a substantially plate shape in cross-sectional view. The thickness of the heel support portion 20 is preferably 8 mm or more. The lower surface of the heel support part 20 is fixed to the upper surface of the midsole 4, for example, with an adhesive.

In this embodiment, since a difference is provided between the thickness of the rear foot part H and the thickness of the forefoot part F in the sole body 2, the wearer's foot f tends to be in a forward leaning posture. As a result, the timing of the weight shift from the rear foot portion H to the forefoot portion F during the load path is not delayed, and the weight of the wearer is more likely to be applied to the portion of the sole 1 corresponding to the forefoot portion F. Therefore, the pressure transmitted from the lower protrusions 7, 7, . . . and the upper protrusions 8, 8, . . . is easily transmitted to the sole of the wearer's forefoot F in a timely manner. Therefore, even in this embodiment, the wearer's sensation of pressure on the forefoot F can be relatively enhanced.

Further, the sole body 2 is configured such that the difference between the thickness of the portion corresponding to the rear foot portion H and the thickness of the portion corresponding to the forefoot portion F is 8 mm or more. With this configuration, the wearer's feet f can be easily maintained in a forward-leaning posture. As a result, the wearer's sensation of pressure on the forefoot F can be relatively enhanced.

[Other embodiments]
In each of the embodiments described above, the sole 1 includes the sole body 2 composed of the outsole 3 and the midsole 4, but the present invention is not limited to this embodiment. For example, the sole body 2 may be formed of an outsole 3.

Further, in each of the above embodiments, the upper convex portions 8, 8, . . . are arranged only at positions corresponding to the forefoot portion F of the midsole 4, but the present invention is not limited to this embodiment. For example, in the first embodiment and its modifications, the upper convex portions 8, 8, ... are placed at a position corresponding to the forefoot portion F of the sole body 2 and at a position corresponding to the rear foot portion H of the sole body 2. It may be placed on both sides. On the other hand, in the second embodiment, the upper convex parts 8, 8, ... are placed at the positions corresponding to the forefoot part F of the sole body 2 and at the midfoot part M and/or the rear foot part H of the sole body 2. They may be placed in corresponding positions.

Further, in each of the above embodiments, the lower convex portions 7, 7, . . . are arranged over substantially the entire lower surface of the outsole 3, but the present invention is not limited to this embodiment. In other words, it is sufficient that each upper convex portion 8 overlaps each lower convex portion 7 in a cross-sectional view, forming a pair of upper and lower convex portions, and the lower convex portions 7, 7, . . . are not necessarily arranged over substantially the entire lower surface of the outsole 3. It doesn't have to be done.

Further, in each of the above embodiments, the lower convex portions 7, 7 are formed to have different thicknesses and lengths, but the present invention is not limited to this. That is, the lower protrusions 7, 7 may be formed to have the same thickness and length. The same applies to the upper convex portions 8, 8, .

Further, in the first embodiment and its modified example, the upper surface of the sole body 2 at the position corresponding to the midfoot portion M is formed in a substantially flat shape, but the present invention is not limited to this embodiment. In other words, if the bending rigidity value of the portion of the sole body 2 corresponding to the middle foot M is 0.258 Nm/deg or more, the upper surface of the sole body 2 corresponding to the middle foot M is not necessarily substantially It does not have to be formed in a flat shape.

Further, in the first embodiment, the reinforcing body 9 has a substantially trapezoidal shape in plan view, but the reinforcing body 9 is not limited to this shape. That is, the reinforcing body 9 may have various shapes in plan view, such as a circular shape, a triangular shape, and a pentagonal shape.

Furthermore, in the first embodiment, the reinforcing body 9 is laminated between the outsole 3 and the midsole 4, but the present invention is not limited to this embodiment. For example, the reinforcing body 9 may be embedded inside the outsole 3 or inside the midsole 4. Alternatively, the upper surface of the reinforcing body 9 may be laminated and arranged on the lower surface of the outsole 3. Alternatively, the lower surface of the reinforcing body 9 may be laminated and arranged on the upper surface of the midsole 4.

Further, in the second embodiment, the sole body 2 is not provided with the reinforcing body 9 shown in the first embodiment, but the present invention is not limited to this embodiment. That is, even in the second embodiment described above, it is possible to provide the reinforcing body 9 on the sole body 2.

Further, in the second embodiment, the heel support portion 20 configured as one member is provided at a position corresponding to the rear foot portion H of the sole body 2, but the present invention is not limited to this embodiment. For example, a member (not shown) in which the heel support portion 20 is integrally formed with the sole body 2 in advance may be used. That is, in the second embodiment, if there is a difference between the thickness of the rear foot part H and the thickness of the forefoot part F in the sole body 2, the heel support part 20 is configured as a separate member from the sole body 2. It doesn't matter whether or not.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various changes can be made within the scope of the present disclosure.

Examples regarding the sole according to the second embodiment described above and shoes equipped with the same will be shown below. Specifically, the foot pressure was measured when one test subject wore the four shoe test specimens, and from the measurement results, the load ratio (hereinafter referred to as "load ratio") on the part of the sole corresponding to the forefoot was calculated. After calculating, a comparative study was conducted regarding each load ratio. Note that the present disclosure is not limited to these examples.

[Test specimen and measurement conditions]
Table 1 below shows the main configurations of the soles applied to each of the four shoe test specimens used in this measurement, as well as the thickness of each sole in the area corresponding to the forefoot and the area corresponding to the hindfoot. It shows the difference in thickness. Further, Table 2 below shows various conditions when performing this measurement. Note that the soles of the test specimens shown in Table 1 were not provided with a structure corresponding to the reinforcing body shown in the first embodiment.

[How to calculate load ratio]
Next, a method for calculating the load ratio will be explained below.

First, based on the foot pressure data obtained by foot pressure measurement, the position where the toe of the subject's foot (front end of the forefoot) abuts the sole of each test object (hereinafter referred to as "toe position"), The position (hereinafter referred to as "heel position") where the heel of the wearer's foot (the rear end of the hindfoot) abuts the sole of each test specimen is identified. As a result, the distance in the foot length direction of the test subject's foot that came into contact with the sole of each test object (hereinafter referred to as "foot distance") is determined. Then, when the long distance of the foot is taken as 100%, a position that is 55.8% forward from the heel position is determined as the position of the rear end of the forefoot of the subject's foot. As a result, the forefoot area of the test subject's foot that is in contact with the sole of each test object (hereinafter referred to as "forefoot area") is specified.

Second, a first total value A of foot pressure applied to the forefoot area and a second total value B of foot pressure applied to the area from the toe position to the heel position are calculated. Then, the load ratio X (%) of the foot pressure applied to the forefoot region is calculated using the formula "X=(A/B)×100". Note that the average value obtained when this measurement is continued for 5 seconds is taken as the representative value of the load ratio X (%) in the sole of each test piece.

[Comparison]
The load ratio X (%) of each test specimen obtained by the above measurements is shown in Table 1 (see the right column of Table 1) and FIG. Referring to Table 1 and FIG. 11, test specimen No. 1 and no. In No. 2, the load ratio X is less than 50%. That is, when the difference between the thickness of the area corresponding to the forefoot and the thickness of the area corresponding to the hindfoot in the sole was 4 mm and 6 mm, the foot pressure on the forefoot area of the sole was relatively low. . In contrast, test specimen No. 3 and no. 4, the load ratio X is 50% or more. That is, if the difference between the thickness of the portion of the sole corresponding to the forefoot and the thickness of the portion corresponding to the hindfoot was 8 mm or more, the foot pressure against the forefoot region of the sole was relatively high.

According to this comparative study, by configuring the sole body so that the difference between the thickness of the part corresponding to the rear foot and the thickness of the part corresponding to the forefoot is 8 mm or more, It was found that the foot pressure was relatively high. As a result, in the shoes of the example (test specimens No. 3 and No. 4), the test subject's (wearer's) foot is easily maintained in a forward-leaning position, and the wearer's experience of pressure on the forefoot is relative. It turns out that it is possible to increase the

The present disclosure can be used industrially as a sole applied to, for example, sports shoes for running or various competitions, sneakers for daily use, and shoes for rehabilitation, and shoes using the same.

S: Shoe 1: Sole 2: Sole body 3: Outsole 4: Midsole 7: Lower convex portion 8: Upper convex portion 9: Reinforcement body 10: Upper 20: Heel support portion

Claims (3)

In soles for shoes,
The sole body,
a plurality of lower protrusions arranged in the sole body at a position corresponding to at least the forefoot of the wearer's foot, each protruding toward the lower side of the sole body;
The upper and lower convex portions are arranged in the sole body at a position corresponding to the forefoot of the wearer 's foot, and each protrudes toward the upper side of the sole body and overlaps each of the plurality of lower convex portions in cross-sectional view. A plurality of upper convex portions forming a pair,
The sole body is configured such that the rigidity of the portion from the position corresponding to the Lisfranc joint of the wearer's foot to the position corresponding to the Chopard joint is higher than the rigidity of the portion corresponding to the forefoot of the wearer's foot. ,
The upper surface of the sole body (excluding the upper for covering the wearer's foot), which is located at the rear of the position corresponding to at least the Lisfranc joint of the wearer's foot, extends from the medial instep side to the lateral instep side. A sole that is substantially flat across the width of the foot . In soles for shoes,
The sole body,
a plurality of lower protrusions arranged in the sole body at positions corresponding to the forefoot of the wearer 's feet, each protruding toward the lower side of the sole body;
A pair of upper and lower convex portions are disposed in the sole body at a position corresponding to at least the forefoot of the wearer's foot, and each protrudes toward the upper side of the sole body and overlaps each of the plurality of lower convex portions in cross-sectional view. a plurality of upper convex portions,
The sole body is configured such that a portion corresponding to the midfoot of the wearer's foot has a higher rigidity than a portion corresponding to the forefoot of the wearer's foot,
The upper surface of the sole body (excluding the upper for covering the wearer's foot) at the position corresponding to the midfoot and rear foot of the wearer's foot extends from the medial instep side to the lateral instep side. A sole that is substantially flat across the width of the foot . Shoes comprising the sole according to claim 1 or 2 .

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