JP2021053229A - Shoe - Google Patents

Abstract

To provide a shoe improved in fitting property to a sole by being reduced in forward/backward slipping of the sole.SOLUTION: A shoe (A) includes: a sole 1; and an upper 2 fitted to the sole. A foot contact surface with which a sole comes into contact in the sole has a heel side including a longitudinal arch fitting part 11 that is opposed to an arch of the sole. The longitudinal arch fitting part is formed while protruding toward an inside longitudinal arch and an outside longitudinal arch of the arch across the whole length in a shoe width direction of the foot contact surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to lightweight, easy-to-walk and less tiring shoes suitable for walking including not only walking, hiking and walking but also jogging and running.

Conventionally, this type of footwear includes an instep and a sole assembly fixed to the instep, the sole assembly is composed of a first portion having an upper surface and a recess formed therein, the recess being the heel portion. There is a footwear article including a lightweight running shoe that extends from the sole to the forefoot portion and is provided with an insertion portion made of a foam material as a second portion in the recess (see, for example, Patent Document 1).
The upper surface of the sole assembly (first part) is secured to the instep by adhesive or other suitable fixing means. The insertion portion has a substantially smooth upper surface that contacts the sole of the foot, and a part of the upper surface is fixed by contacting the instep with an adhesive or other suitable fixing means.
The sole assembly also has a ground engaging lower surface, the ground engaging lower surface including a plurality of protrusions, each of which is surrounded by a groove. Further, on the lower surface of the ground engagement, a plurality of crossing slots are formed so as to extend between adjacent protrusions.

Japanese Unexamined Patent Publication No. 2012-86036

However, in Patent Document 1, the upper surface of the insertion portion that comes into contact with the sole of the foot is formed to be substantially smooth, and although the upper surface of the insertion portion can be expected to have some elastic deformation along the shape of the sole, the inside of the arch. It was difficult to make contact along the vertical arch and the outer vertical arch.
For this reason, the sole of the foot becomes slippery in the shoe in the length direction of the foot as the person walks, resulting in poor fit, and the pressure applied to the sole of the foot is not distributed throughout the sole of the foot, causing pain such as octopus and corn. Or there was a problem that it led to hallux valgus.
By the way, for a shoe sole that is easy to walk, it is important to make it easy to bend the ball at the base of the big toe on the sole of the foot and the part facing the ball at the base of the little finger when worn by the user. It is said that the shoes are less likely to get tired because the part facing the ball of the big toe and the ball of the little toe is easy to bend.
However, in Patent Document 1, since unevenness such as protrusions, grooves, and crossing slots is exposed on the ground contact surface (ground engagement lower surface) of the sole (sole assembly), the groove is formed by bending the sole with use. And cracks are likely to occur at the edge of the slot.
If even a slight crack enters the groove of the sole or the edge of the slot, the crack will increase due to the bending of the sole due to subsequent use, causing a decrease in the strength of the sole, and there is a problem that the product life will end in a short period of time. It was.
Further, when the sole formed by exposing the groove or unevenness for bending on the ground contact surface is a molded product such as insert molding or injection molding, voids (air bubbles) are likely to occur in the groove or unevenness of the exposed ground contact surface. As a result, there is also a problem that the defective rate increases and the productivity is inferior.

In order to solve such a problem, the shoe according to the present invention is a shoe provided with a sole and an upper attached to the sole, and the heel side of the foot contact surface in contact with the sole of the sole is It has a vertical arch fitting portion that faces the arch of the foot, and the vertical arch fitting portion projects toward the inner vertical arch and the outer vertical arch of the arch over the entire length of the foot contact surface in the shoe width direction. It is characterized by being formed.

It is explanatory drawing which shows the whole structure of the shoe which concerns on embodiment of this invention, (a) is a longitudinal front view, (b) is the cross-sectional plan view. It is explanatory drawing which shows the whole structure of the inner sole, (a) is a longitudinal front view, and (b) is the cross-sectional plan view. It is explanatory drawing when the inner sole is used, (a) is the enlarged longitudinal side view along the line (3A)-(3A) of FIG. 1 (a) and FIG. (A) and enlarged longitudinal side view along the lines (3B)-(3B) of FIG. 2 (a), (c) is the line (3C)-(3C) of FIGS. 1 (a) and 2 (a). It is an enlarged vertical side view along with.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The shoe A according to the embodiment of the present invention is a lightweight, easy-to-walk and less tiring comfort shoe (made in consideration of foot health) suitable for walking (including walking, hiking, walking as well as jogging and running). Comfortable shoes).
More specifically, as shown in FIGS. 1 to 3, the shoe A according to the embodiment of the present invention includes a sole 1 as a sole and an upper 2 attached to the sole 1 as main components. There is. Further, it is preferable to provide the inner sole 3.
The shoe A is mainly divided into a toe portion (forefoot portion) A1, an arch portion (midfoot portion) A2, and a heel portion (heel portion) A3. The vertical direction from the toe to the heel is hereinafter referred to as "foot length direction D", and the horizontal direction intersecting the foot length direction D is hereinafter referred to as "shoe width direction W".

The sole 1 is a deformable material such as a thermoplastic resin such as polyurethane (PU) or ethylene-vinyl acetate copolymer (EVA) or other similar synthetic resin or rubber, and is formed by insert molding or injection molding. Ru. Among these deformable materials, it is preferable to mold the unit sole or the direct sole with PU.
As specific examples of the sole 1, when shown in FIGS. 1 (a) (b) and 3 (a) (b) (c), the sole 1 is a unit sole, and the upper 2 described later in the injection mold manufacturing method. Is attached by fixing means such as adhesion.
Further, although not shown as another example of the sole 1, it is also possible to mold the direct sole by the direct sawing method and at the same time directly bond and integrally mold the upper 2 described later.

The sole 1 has a foot contact surface 1t that the sole S contacts on the upper 2 side, which will be described later, and a ground contact surface 1 g that serves as a sole on the opposite side of the foot contact surface 1t.
A vertical arch fitting portion 11 is provided on the heel side of the arthropod surface 1t.
The heel side of the foot contact surface 1t is a portion of the sole 1 corresponding to the arch portion A2 and the heel portion A3, and the vertical arch fitting of the sole S facing the arch portion Sa over the arch portion A2 and the heel portion A3. The portion 11 is formed so as to protrude.
The vertical arch fitting portion 11 is formed over substantially the entire length of the shoe width direction W of the foot contact surface 1t, and projects toward at least the inner vertical arch Sa1 and the outer vertical arch Sa2 at the arch Sa. As a result, the vertical arch fitting portion 11 is configured to fit the inner vertical arch Sa1 and the outer vertical arch Sa2 of the arch in the foot length direction D while being worn by the user.

Further, in the examples shown in FIGS. 1 (a) and 1 (b) and 3 (a), (b) and (c), the cushion material 12 is provided on the heel side of the foot contact surface 1t. More specifically, a recess 1c is formed in the center of the shoe width direction W at a portion extending from the arch portion A2 to the heel portion A3 of the sole 1, and the cushion material 12 is embedded inside the recess 1c.
The cushion material 12 is formed of a foam material made of EVA or other similar synthetic resin in a predetermined shape, and has an intermediate convex portion 11c that becomes a part of the vertical arch fitting portion 11.
The intermediate convex portion 11c is formed on the surface 12a of the cushion material 12, and fits in the shoe width direction W intermediate portion Sa3 and the foot length direction D of the inner vertical arch Sa1 and the outer vertical arch Sa2 of the arch Sa1 while worn by the user. It is projected into a matching shape.
That is, in the arch portion A2 and the heel portion A3 of the sole 1, the inner convex portion 11a and the outer convex portion 11b forming the other portion of the vertical arch fitting portion 11 are formed inside and outside the shoe width direction W, respectively. The vertical arch fitting portion 11 is divided in the shoe width direction W.
Although not shown as another example, the cushion material 12 is not provided on the heel side of the foot contact surface 1t, and the vertical arch fitting portion 11 is divided over the entire length of the arch portion A2 and the heel portion A3 in the shoe width direction. It is also possible to form one piece without it.

Further, as a method of manufacturing the sole 1 and the cushion material 12, the cushion material 12 is molded in advance, the cushion material 12 is temporarily fixed to the bottom surface of an upper mold (not shown) such as the last, and then the material of the sole 1 is injected. Therefore, it is preferable to perform insert molding integrally.
In the case of the illustrated example as a means for temporarily fixing the cushion material 12 to the upper mold, a plurality of through holes 12b for temporary fixing are opened in advance in the cushion material 12, and the support shaft of the upper mold (shown) is formed in these through holes 12b. By elastically fitting (not), the cushion material 12 is suspended so that it cannot fall. Insert molding is started in this temporarily fixed state, and the material of the sole 1 is injected to allow the material to penetrate from the bottom surfaces of the plurality of through holes 12b and harden. By pulling out the support shaft of the upper mold from the plurality of through holes 12b after the insert molding, a plurality of gaps 12c are formed inside the plurality of through holes 12b, and at the same time, they penetrate from the bottom surfaces of the plurality of through holes 12b. A plurality of positioning protrusions 12d are integrally formed of the material that has been cured.
As a result, the weight can be reduced by the plurality of gaps 12c, and the sole 1 and the cushion material 12 are positioned by fitting the plurality of through holes 12b and the plurality of positioning protrusions 12d to improve the stability. That is, the plurality of through holes 12b are used for temporary fixing support during insert molding and for weight reduction and positioning after insert molding, which is excellent in convenience.

A concave groove 13 and a space portion 14 are provided on the toe side of the foot contact surface 1t in order to increase the flexibility of the sole 1.
The toe side of the foot contact surface 1t is a portion corresponding to the toe portion A1 in the sole 1, and the toe portion A1 of the sole 1 is divided into a stepping portion 1a and a toe portion 1b.
The stepping portion 1a is a portion formed so as to face the ball of the toe at the base of the thumb of the sole S and the ball of the little toe at the base of the little finger when worn by the user. The toe portion 1b is a portion formed on the front side in the foot length direction D adjacent to the stepping portion 1d.
It is preferable that the concave groove 13 and the space portion 14 are provided only in at least the stepping portion 1a, or are provided over both the stepping portion 1a and the toe portion 1b.

When shown in FIGS. 1 (a) (b) and 3 (a) (b) (c) as specific examples of the concave groove 13 and the space portion 14, the concave groove extends over the stepping portion 1a and the toe portion 1b. A plurality of 13 and the space portion 14 are arranged in the foot length direction D.
The concave grooves 13 extend in a wave shape in the shoe width direction W and are arranged at predetermined intervals in the foot length direction D, and inside the concave grooves 13 having these waveforms, a wave-shaped space portion 14 along the concave groove 13 is provided. Are formed respectively. A plurality of partition walls 15 are formed between the concave grooves 13 adjacent to each other in the foot length direction D.
Further, although not shown as another example, the shapes of the concave groove 13 and the space portion 14 may be changed to other than the wave shape, the concave groove 13 and the space portion 14 may be separated in the shoe width direction W, and the concave groove 13 and the space portion 14 may be separated. It is also possible to change the number or arrangement of the space portions 14 to a number or arrangement other than the illustrated example.

An uneven pattern (not shown) is formed on the ground contact surface 1g of the sole 1 for the purpose of preventing slipping, but a groove for bending is not recessed.
When shown in FIGS. 1 (a) (b) and 3 (a) (b) (c) as specific examples of the contact patch 1 g, the grip material 16 is partially embedded in the toe portion A1 and the heel portion A3. doing.
The grip material 16 is preferably made of soft rubber or the like, which is softer than the hardness of the material constituting 1 g of the ground contact surface of the sole 1, and is arranged so as to slightly protrude from the uneven pattern.

The upper 2 is composed of an instep 21 that covers the instep, and when the sole 1 as shown in the figure is a unit sole, it is preferable to have an insole 22 provided at the bottom of the instep 21.
The instep 21 is attached to the outer peripheral portion of the sole 1 by a fixing means such as adhesion.
The insole 22 is an insole connected to the bottom of the insole 21 by sewing or the like.
In the state where the instep 21 is attached to the sole 1, it is preferable that the back surface of the insole 22 is brought into contact with the surface of the partition wall 15 and adhered as shown in FIGS. 1 (a) and 3 (a).
As a result, the surface of the concave groove 13 is covered with the insole 22, and a space portion 14 is formed between the insole 22 and the concave groove 13.

The inner sole 3 is an insole that can be inserted or removed afterwards, and is made of an elastically deformable material and is formed in a sheet shape.
Types of the inner sole 3 include a "footbed insole" that is three-dimensionally cut according to the shape of the sole S, and a "flat insole" that has no unevenness. Further, as the size of the inner sole 3, there are "full size" which is the same length as the foot length and "half size" which is about half the length of the foot length.
When the inner sole 3 is inserted along the surface of the insole 22, an appropriate gap is provided between the inner sole 3 and the surface of the insole 22 as shown by the solid lines in FIGS. Occurs. When worn by the user, the inner sole 3 is elastically deformed by the pressure applied by the sole S shown by the alternate long and short dash line in FIGS. 3 (a), 3 (b), and 3 (c), but is elastically deformed to the surface of the insole 22. The gap is partially crushed.

It is preferable to form a protrusion 31 on the surface of the inner sole 3 so as to face the metatarsal bone of the sole S. The protrusion 31 is configured to elastically deform along the shape of the sole S and appropriately press the metatarsal bone by abutting against the sole S while worn by the user. Therefore, the metatarsal bone is lifted by the protrusion 31 as the person walks, and the lateral arch can be supported.
Further, on the surface of the inner sole 3, it is preferable to project convex portions 32 facing the inner vertical arch Sa1 and the outer vertical arch Sa2 of the arch Sa on the inner and outer sides in the shoe width direction W. As a result, the convex portion 32 appropriately abuts on the inner vertical arch Sa1 and the outer vertical arch Sa2 of the arch of the foot in the state of being worn by the user, and the vertical arch can be supported.
As specific examples of the inner sole 3, when shown in FIGS. 2 (a) (b) and 3 (a) (b) (c), a full-size footbed insole is used.
Further, although not shown as another example, changing the shape or position of the protrusion 31 or the convex portion 32 to a shape or position other than the illustrated example, or eliminating one or both of the protrusion 31 or the convex portion 32. Is also possible. It is also possible to provide the foot contact surface 1t of the sole 1 with a function of lifting the metatarsal bone by the protrusion 31.

According to the shoe A according to the embodiment of the present invention, when walking, the vertical arch fitting portion 11 fits with the inner vertical arch Sa1 and the outer vertical arch Sa2 of the arch of the foot S, and the arch of the foot S. The contact area with Sa increases.
Therefore, it becomes difficult for the sole S to slip in the foot length direction D in the shoe A or the sole 1 accompanying walking, and the pressure applied to the sole S is also dispersed throughout the sole S.
Therefore, the front-back slip of the sole S is reduced, and the fit with the sole S can be improved.
As a result, as compared with the conventional product in which the ground contact surface of the sole is substantially smooth and elastically deformable, it is possible to obtain an effect of suppressing bunions and the like, rather than the occurrence of octopus and corns that cause pain.

In particular, it is preferable that the cushion material 12 is embedded on the heel side in the foot contact surface 1t, and the cushion material 12 has an intermediate convex portion 11c that is a part of the vertical arch fitting portion 11.
In this case, the intermediate convex portion 11c of the cushion material 12 fits with the arch Sa of the sole S during walking, and the impact from the ground is absorbed.
Therefore, it is possible to reduce the burden on the sole S due to an excessive impact.
As a result, it becomes easier to walk and less tired.

Further, the toe side of the foot contact surface 1t extends in a wavy shape in the shoe width direction W and is arranged side by side in the foot length direction D at least facing the ball of the foot S and the ball of the small toe. It is preferable to have a groove 13 and a plurality of corrugated space portions 14 formed inside the concave groove 13.
In this case, the toe side of the foot contact surface 1t facing the mother toe ball and the small toe ball during walking is not limited to the shoe width direction W or the foot length direction D due to the corrugated concave groove 13 and the corrugated space portion 14. , Easy to bend in any direction.
For this reason, the pressure received from the sole S during walking is dispersed to improve the comfort of wearing, and the weight is reduced by the plurality of space portions 14, making walking easier and less tiring.
Therefore, it is possible to simultaneously achieve the improvement of flexibility required for walking and the weight reduction.
As a result, compared to the conventional product in which bending grooves and irregularities are exposed on the ground contact surface of the sole, it is not necessary to provide a bending groove on the ground contact surface 1g of the sole 1, so that the sole is used. It is possible to prevent cracks from being generated from the edge of the groove by bending 1. As a result, high bending can be achieved while preventing a decrease in strength for a long period of time, and the product life can be extended.
Further, compared to the conventional product in which the groove for bending and the unevenness are exposed on the ground contact surface of the sole, even if the sole 1 is a molded product such as insert molding or injection molding, the unevenness such as the concave groove 13 is not exposed. Since it is arranged on the contact patch 1t, even if voids (air bubbles) are generated in the unevenness such as the concave groove 13, it is not exposed, so that it does not become a defective product and productivity can be improved.

Further, the concave groove 13 and the space portion 14 extend from the stepping portion 1a where the ball of the foot S and the ball of the small toe are in contact with the foot contact surface 1t to the toe portion 1b formed adjacent to the stepping portion 1d. It is preferable to arrange it.
In this case, when walking, not only the stepping portion 1a but also the toe portion 1b is included, and the concave groove 13 and the space portion 14 make it easier to bend. The weight of the stepping portion 1a and the toe portion 1b is reduced by the plurality of space portions 14.
Therefore, further improvement in flexibility required for walking and further weight reduction can be achieved at the same time.
As a result, it becomes very easy to walk and less tired.

In the embodiment shown above, the upper 2 has an insole 22 and the surface of the concave groove 13 is covered with the insole 22 to form a space 14 between the insole 22 and the concave groove 13. However, the present invention is not limited to this, and the space portion 14 may be formed between the inner sole 3 and the concave groove 13 without providing the insole 22.
Further, in the illustrated example, the case where a full-size footbed insole is used as the inner sole 3 has been described, but the present invention is not limited to this, and a half-size footbed insole or a flat is used instead of the full-size footbed insole. -It is not necessary to use an insole or to omit the inner sole 3.

A Shoes 1 Sole 1a Stepping part 1b Toe part 1t Foot contact surface 11 Vertical arch fitting part 11c Intermediate convex part 12 Cushion material 13 Concave groove 14 Space part 2 Upper D Foot length direction S Foot sole Sa Arch Sa1 Inner vertical arch Sa2 Vertical arch W shoe width direction

Claims (4)

A shoe having a sole and an upper attached to the sole.
The heel side of the foot contact surface in contact with the sole of the sole has a vertical arch fitting portion facing the arch of the foot.
The shoe is characterized in that the vertical arch fitting portion is formed so as to project toward the inner vertical arch and the outer vertical arch of the arch over the entire length of the foot contact surface in the shoe width direction. The shoe according to claim 1, wherein the shoe has a cushion material embedded in the heel side on the foot contact surface, and the cushion material has an intermediate convex portion that becomes a part of the vertical arch fitting portion. The toe side of the foot contact surface has at least a corrugated concave groove that faces the ball of the foot and the ball of the small toe and extends in a wavy shape in the shoe width direction and is arranged side by side in the foot length direction. The shoe according to claim 1 or 2, wherein the shoe has a plurality of corrugated space portions formed inside the concave groove. The concave groove and the space portion are arranged from a stepping portion in which the ball of the mother toe and the ball of the small toe are in contact on the foot contact surface to a toe portion formed adjacent to the stepping portion. The shoe according to claim 1, 2 or 3.

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