JP2023072712A - Sole structure of footwear, and footwear - Google Patents

Abstract

To provide a sole structure that enables a soft centroid movement.SOLUTION: A sole structure 100 includes: a cradle 10 for receiving a physical body weight from a sole, and supporting a body; and a first tooth 20 and a second tooth 30 provided to the cradle 10 while being protruded downward. The cradle 10 is formed of a material where hardness of a type A durometer defined in JIS K6253 is 20 or more and 90 or less. The first tooth 20 extends in a width direction, and is arranged in a position being a lower part of an anklebone and a heel side from the anklebone and not coming out to the nail tip side, in the state where the foot wearing a footwear 1 lands to the flat ground. The second tooth 30 extends in the width direction, and is arranged in the position being a lower part of a metatarsal bone and the heel side from the metatarsal bone and not coming out to the nail tip side, in the state where the foot wearing the footwear 1 lands to the flat ground.SELECTED DRAWING: Figure 2

Description

The present invention relates to footwear sole structures and footwear.

In footwear such as shoes and sandals, it has been proposed to provide soles with various functional improvements such as improving performance of movement when wearing footwear or reducing foot troubles (Patent Document 1). .

Patent Literature 1 discloses an insole part that constitutes a part of an insole for shoes. The insole part has a bottom portion facing a portion of the sole and a rising portion rising from the outer edge of the bottom portion toward the side of the foot. The bottom part and the rising part are provided with a thick part that supports the Chopard joint.

JP 2020-141892 A

In order to improve performance in sports competitions and physical expression, it is important to keep the trunk supple and move the center of gravity flexibly to effectively use gravity without forcibly resisting it. In the insole disclosed in Patent Literature 1, although the Chopard joint is supported by the thick portion, there is a risk that the thick portion will block the flexible movement of the center of gravity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sole structure that enables flexible movement of the center of gravity.

The present invention is a sole structure of footwear to be worn on a human foot, comprising: a base for supporting the body by receiving the weight of the body from the sole of the foot; and a base 10 projecting downward. a first tooth and a second tooth, wherein the first tooth and the second tooth extend widthwise and are longitudinally spaced apart from one another; , the hardness of the type A durometer defined in JIS K6253 is 20 or more and 90 or less, and the first tooth is located below the talus when the foot wearing the footwear lands on a flat surface. and the second tooth is positioned below the metatarsal bone when the foot wearing the footwear lands on a flat surface. It is arranged at a position where it does not protrude to the heel side or toe side of the metatarsal bone.

According to the present invention, it is possible to provide a sole that enables flexible movement of the center of gravity.

(a) is a side view of the bones of the right human leg, and (b) is a top view of the bones of the right human leg. (a) is a side view of footwear provided with a sole structure according to an embodiment of the present invention, and (b) is a top view of the footwear shown in FIG. 2(a). FIG. 5 is a side view of footwear with a sole structure according to a modification of the embodiment of the invention;

A sole structure 100 according to an embodiment of the present invention will be described below with reference to the drawings.

First, referring to FIG. 1, the bones of the human foot will be described. FIG. 1(a) is a side view of the bones of the right human leg, and FIG. 1(b) is a top view of the bones of the right human leg.

Hereinafter, the direction connecting the heel and the tip of the second toe (index finger of the foot) will be referred to as the "longitudinal direction", and the direction perpendicular to the longitudinal direction and along the sole will be referred to as the "width direction". The side in the width direction on which the first toe (big toe) is positioned is defined as "inside", and the side on which the fifth toe (little toe) is positioned is defined as "outside". FIG. 1(a) is a view of the bones of a human right leg viewed from the outside.

As shown in FIG. 1, the human foot includes, in order from the toe side to the heel side, the distal phalanx, the middle phalanx (only the second, third, fourth and fifth toes), and the base. There are phalanges, which are collectively called phalanges. There is a metatarsal bone on the heel side of the toes, and the first cuneiform bone, the second cuneiform bone, the third cuneiform bone, and the cuboid bone line up from the inside to the outside on the heel side of the metatarsal bone. On the heel side of the first, second, and third cuneiform bones, there is the navicular bone inside the cuboid bone, and on the heel side of the navicular bone, there is the talus, and on the heel side of the cuboid bone. There is a calcaneus below the talus. The calcaneus protrudes further to the heel than the talus.

The joints between the metatarsals and the first, second, third and cuboid bones are called Lisfranc joints, the joints between the navicular and talus, and the cuboid and heel. Joints between bones are called Chopard joints. The joint between the metatarsal and proximal phalanx is called the metatarsophalangeal joint.

There is a ball of the thumb near the toe-side end of the metatarsal bone of the first toe, and a lesser ball of the fifth toe near the toe-side end of the metatarsal. A transverse arch is formed between the ball of the thumb and the ball of the lesser toe. That is, the transverse arch is formed along the metatarsophalangeal joint. A medial longitudinal arch is formed between the ball of the thumb and the longitudinal calcaneus, and a lateral longitudinal arch is formed between the ball of the little finger and the longitudinal calcaneus. That is, the medial longitudinal arch and the lateral longitudinal arch are formed via the Chopard joint and the Lisfranc joint.

The lateral, medial, and lateral longitudinal arches act like cushions to absorb and disperse the impact of landing, and act like springs to smooth the movement of the center of gravity of the human body and support kicking off the ground. do.

In order to improve performance in sports competitions and physical expression, it is important to keep the trunk supple and move the center of gravity flexibly to effectively use gravity without forcibly resisting it. The present inventors have found that optimal use of the medial longitudinal arch and the lateral longitudinal arch is an important point for flexible movement of the center of gravity. In the sole structure 100 according to this embodiment, it is possible to optimally utilize the medial longitudinal arch and the lateral longitudinal arch by the configuration described below. As a result, the center of gravity of the body can be moved flexibly.

2(a) is a side view of footwear 1 with sole structure 100, and FIG. 2(b) is a top view of footwear 1. FIG. In this embodiment, the footwear 1 is sandals, but the footwear 1 may be shoes.

Although FIG. 2 shows only the footwear 1 for the right foot, there are actually footwear 1 for the right foot and footwear for the left foot. Since the configuration of the footwear for the left foot is substantially the same as the configuration of the footwear for the right foot shown in FIG. 2, illustration of the footwear for the left foot is omitted here. In addition, in FIG. 2(a), in order to clarify the positional relationship between the bones of the foot and the sole structure 100, the bones of the foot are also illustrated.

As shown in FIG. 2 , the footwear 1 includes a sole structure 100 , a lateral strap 2 formed on a lace and extending across the sole structure 100 in the width direction, and a front strap extending from the lateral strap 2 to the toe side of the sole structure 100 . 3 and . The footwear 1 is put on the foot by passing the front strap 3 between the first toe and the second toe and putting the horizontal strap 2 on the instep.

The sole structure 100 includes a cradle 10 that receives the weight of the body from the soles of the feet to support the body, first teeth 20 that project downward from the cradle 10, and the toe side of the first teeth 20. a second tooth 30 provided on the . The first tooth 20 and the second tooth 30 extend widthwise and are longitudinally spaced from each other.

The cradle 10 is made of a material having a hardness of 20 or more and 90 or less in type A durometer defined in JIS K6253. For example, the cradle 10 is made of rubber material or cork material. Therefore, when the body weight acts on the cradle 10 , the cradle 10 is raised upward by the first teeth 20 and the second teeth 30 . The cradle 10 is not limited to being made of a single material, and may have, for example, a first layer made of rubber and a second layer made of cork.

A piece of wood, for example, can be used for the first tooth 20 and the second tooth 30 . The first tooth 20 and the second tooth 30 are fixed to the cradle 10 using, for example, an adhesive.

The first tooth 20 is arranged at a position below the talus and not on the heel side of the talus when the foot wearing the footwear 1 lands on a flat surface. Therefore, the cradle 10 is inclined with respect to the flat surface so that the sole of the foot approaches the flat surface as it goes from the Chopard joint toward the heel. Therefore, the pedestal 10 can maintain the heel-side rise of the lateral longitudinal arch and the medial longitudinal arch.

The second tooth 30 is located below the metatarsal bone and closer to the toe than the metatarsal bone (more specifically, the metatarsal bone of the fifth toe) when the foot wearing the footwear 1 lands on a flat surface. It is placed in a position where it does not appear in the Therefore, the cradle 10 is inclined with respect to the flat surface so that the sole approaches the flat surface as it goes from the Lisfranc joint to the toe side. Therefore, the pedestal 10 can maintain the toe-side rise of the lateral longitudinal arch and the medial longitudinal arch.

In addition, the first tooth 20 is located below the talus and does not protrude beyond the talus on the toe side, and the second tooth 30 is located below the metatarsal and Specifically, it is arranged at a position that does not protrude from the heel side of the first toe (metatarsal bone). Therefore, the cradle 10 is flattened between the first tooth 20 and the second tooth 30 or lowered by its own weight. Therefore, it is possible to prevent the movement of the bones in the Chopard joint and the Lisfranc joint from being hindered by the cradle 10, so that the medial longitudinal arch and the lateral longitudinal arch can be optimally utilized. As a result, the center of gravity of the body can be moved flexibly.

In addition, the inventors investigated the position of the talus in a plurality of persons. As a result, the position of the talus differs slightly depending on individual differences, but if the length from the heel to the toe is 100, 95% of the surveyed subjects have a position at a distance of 12.3 from the heel to the toe side and a position at a distance of 12.3 from the heel to the toe. The talus was present in the area between and 31.5 laterally away. According to this result, the distance between the position of the cradle 10 that is 12.3 points away from the heel side end toward the toe side and the position that is 31.5 points away from the heel side end of the cradle 10 toward the toe side is By arranging the first tooth 20 in the range of , the first tooth 20 can be arranged at a position below the talus and not protruding to the heel side and the toe side of the talus. .

The inventors also investigated the location of metatarsal bones in multiple individuals, similar to the talus bone. As a result, although it depends on individual differences, when the length from the heel to the toe is 100, in 95% of the surveyed subjects, the metatarsal bone is located at a distance of 27.6 from the toe to the heel side and at a distance of 27.6 from the toe. It was located in the range between 49.5 on the heel side and 49.5 on the heel side. According to the results, a position at a distance of 27.6 from the toe-side end of the cradle 10 toward the heel, a position at a distance of 49.5 from the toe-side end of the cradle 10 toward the heel, By arranging the second tooth 30 in the range between the second teeth 30, the second teeth 30 are positioned below the metatarsal bones and do not protrude from the metatarsal bones toward the heel side and the toe side. can be placed.

The sole structure 100 further comprises a ground platform 40 coupled to the cradle 10 with the first tooth 20 and the second tooth 30 therebetween. The grounding base 40 contacts the ground when the foot wearing the footwear 1 lands on a flat surface. Grounding platform 40 is secured to first tooth 20 and second tooth 30 using, for example, an adhesive.

Like the cradle 10, the grounding table 40 is made of a material having a hardness of 20 or more and 90 or less in type A durometer specified in JIS K6253. For example, the grounding platform 40 is made of rubber or cork. The grounding base 40 is not limited to being made of a single material, and may have, for example, a first layer made of rubber material and a second layer made of cork material.

When walking or running, the human foot lands from the heel and expands the landing surface toward the toe so that the entire sole lands on the ground (landing motion). After that, take off from the heel, reduce the landing surface toward the toe, and kick the ground with the toe (takeoff motion).

In the sole structure 100, the hardness of the cradle 10 and the grounding pad 40 is 20 degrees or more and 90 degrees or less. curved into. As a result, the grounding platform 40 exerts a restoring force, supports the behavior of the foot until the entire sole of the foot lands on the ground during landing, and supports the behavior of the foot until the tiptoe strikes the ground during the take-off motion. do. Therefore, the center of gravity of the body can be moved more flexibly.

The lateral strap 2 passes between the first tooth 20 and the second tooth 30 to reach the grounding base 40 , and the front strap 3 passes through the toe side of the second tooth 30 to reach the grounding base 40 . has reached Therefore, in the landing motion and the take-off motion, the area between the first tooth 20 and the second tooth 30 on the grounding base 40 is pulled by the horizontal strap 2 , and the toe of the grounding base 40 is pulled more than the second tooth 30 on the grounding base 40 . The side areas are pulled by the front strap 3. Therefore, the grounding base 40 can be curved according to the behavior of the foot during the landing motion and the taking off motion, and the center of gravity of the body can be moved more flexibly.

For example, a knot is formed in the horizontal cord 2 so that the horizontal cord 2 does not come off from the grounding base 40.例文帳に追加

In the example shown in FIG. 2, the first tooth 20 and the second tooth 30 are formed to have a semicircular cross section and are arranged so as to protrude toward the ground, but as shown in FIG. In addition, the first tooth 20 and the second tooth 30 may be arranged so as to be convex toward the side opposite to the ground (foot side). Moreover, the first tooth 20 and the second tooth 30 are not limited to a form in which the cross section is formed in a semicircular shape, and may be in a shape such as a square or a triangle in cross section.

Also, in the example shown in FIGS. 2 and 3, the sole structures 100, 101 comprise a ground platform 40, but the present invention does not comprise a ground platform 40 and instead includes a first tooth 20 and a second tooth. 30 may be grounded to the ground.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. do not have.

Reference Signs List 1 Footwear 2 Side straps 3 Front straps 100, 101 Sole structure 10 Cradle 20 First tooth 30 Second tooth 40・Ground

As shown in FIG. 2, the footwear 1 includes a sole structure 100, a lateral strap 2 formed in a string shape and extending across the sole structure 100 in the width direction, and a front strap extending from the lateral strap 2 to the toe side of the sole structure 100. 3 and . The footwear 1 is put on the foot by passing the front strap 3 between the first toe and the second toe and putting the horizontal strap 2 on the instep.

Claims (3)

A sole structure of footwear worn on a human foot,
a cradle for supporting the body by receiving the weight of the body from the soles of the feet;
a first tooth and a second tooth protruding downward from the pedestal;
The cradle is made of a material having a hardness of 20 or more and 90 or less in type A durometer specified in JIS K6253,
The first tooth extends in the width direction and is arranged at a position below the talus and not protruding to the heel side and the toe side of the talus when the foot wearing the footwear lands on a flat surface. ,
The second tooth extends in the width direction and is positioned below the metatarsal bone and does not protrude toward the heel side and the toe side of the metatarsal bone when the foot wearing the footwear lands on a flat surface. Placed sole structure. further comprising a ground platform coupled to the cradle with the first tooth and the second tooth therebetween;
The grounding table is made of a material having a hardness of 20 or more and 90 or less in type A durometer specified in JIS K6253.
The sole structure according to claim 1. A sole structure according to claim 2;
a lateral cord formed on the lace and extending across the sole structure in the width direction;
a front strap extending from the lateral strap toward the toe side of the sole structure;
The horizontal cord passes between the first tooth and the second tooth and reaches the ground base,
The front strap passes through the toe side of the second tooth and reaches the ground base.
footwear.

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