JP7466241B1 - Insoles and footwear - Google Patents

Abstract

To provide an insole for footwear that enables a person to stand and walk in a stable posture.
[Solution] An insole 15 having a pad 60 to be placed in the foot insertion portion of footwear, the pad 60 being divided into an inner region D1 and an outer region D2 which are arranged on opposite sides of a center line C1 in the width direction when viewed in a plane of the pad 60, the inner region D1 being the region where the big toe is located when viewed in a plane of the pad 60, and the outer region D2 being the region where the little toe is located when viewed in a plane of the pad 60, the pad 60 having a hole 40 which causes the load received from the heel of the foot at a position where the ground contact portion of the footwear corresponds to the outer region D2 to exceed the load received from the heel of the foot at a position where the ground contact portion of the footwear corresponds to the inner region D1.
[Selected Figure] Figure 2A

Description

The present disclosure relates to an insole provided in footwear worn on a person's foot and the footwear.

One example of an insole that is placed inside footwear worn on a person's foot is described in Patent Document 1. The insole described in Patent Document 1 has a toe portion formed to accommodate the toes, a protruding portion formed to accommodate the tips of the metatarsals that protrude most to the left and right of the foot, an arch portion formed to accommodate the area from the metatarsals to just below the lateral malleolus, and a heel portion formed to accommodate the area just below the lateral malleolus and the calcaneus behind it, and is equipped with at least two foamed resin layers that are placed over the entire bottom surface of the shoe.

The insole described in Patent Document 1 includes a support plate that is bonded to the underside of the two layers and is made of a harder material than the foamed resin of the second layer. The support plate described in Patent Document 1 has an opening that allows the heel parts of the first and second layers to receive and absorb the load applied by the heel. Patent Document 2 also describes an insole designed so that the thickness of the part of the insole that corresponds to the heel is thinner than the thickness of the left and right sides.

Patent No. 7090857 JP 2006-102335 A

The inventors of the present application recognized that the insoles described in Patent Documents 1 and 2 still have room for improvement in terms of enabling a person to stand and walk in a stable posture.

The purpose of this disclosure is to provide an insole and footwear that allows a person to stand and walk in a stable posture.

The present disclosure relates to an insole having a pad placed in a foot accommodation space of footwear, the pad being divided into an inner region and an outer region that are arranged on opposite sides of a center line in the width direction of the pad in a plan view, the inner region being a region where the big toe is located in the plan view of the pad, and the outer region being a region where the little toe is located in the plan view of the pad, the pad having an assisting mechanism that causes the load received from the heel of the foot at a position where the ground contact portion of the footwear corresponds to the outer region to exceed the load received from the heel of the foot at a position where the ground contact portion corresponds to the inner region.

The present disclosure relates to footwear having a main body portion into which a person's foot is inserted and a ground contact portion fixed to the main body portion and grounded, the main body portion being divided into an inner region and an outer region that are arranged on opposite sides of a center line in the width direction of the main body portion in a plan view of the main body portion, the inner region being an area where the big toe of the foot is located in a plan view of the main body portion, and the outer region being an area where the little toe of the foot is located in a plan view of the main body portion, the ground contact portion being arranged across the inner region and the outer region in a plan view of the main body portion, and the ground contact portion having a setting mechanism that causes a load that the ground contact portion receives from the heel of the foot at a position corresponding to the outer region to exceed a load that the ground contact portion receives from the heel of the foot at a position corresponding to the inner region.

The insole of the present disclosure allows a person to stand in a stable position and walk in a stable position. Footwear equipped with the insole of the present disclosure allows a person to stand in a stable position and walk in a stable position.

1 is a front view of a first embodiment of footwear provided with an insole, as viewed from the heel side of the foot. FIG. FIG. 1B is a side view of the left half-foot shown in FIG. 1A. 13 is a schematic plan view of the left and right half foot portions of a footwear provided with an insole according to a seventh embodiment. FIG. 2B is a front cross-sectional view taken along line II-II in FIG. 2A. FIG. 11 is a front view of a second embodiment of footwear provided with an insole, as viewed from the heel side of the foot. FIG. 3B is a side view of the left half-foot shown in FIG. 3A. FIG. 11 is a front view of a third embodiment of footwear provided with an insole, as viewed from the heel side of the foot. FIG. 4B is a side view of the left half-foot shown in FIG. 4A. FIG. 11 is a front view of a fourth embodiment of footwear provided with an insole, as viewed from the heel side of the foot. FIG. 13 is a front view of a fifth embodiment of footwear provided with an insole, as viewed from the heel side of the foot. FIG. 13 is a front view of a sixth embodiment of footwear provided with an insole, as viewed from the heel side of the foot. 13 is a schematic plan view of the left and right half foot portions of a footwear provided with an insole according to an eighth embodiment. FIG. FIG. 2 is a schematic cross-sectional side view showing the insole, the left foot, and the skeleton. 13 is a schematic plan view of the left and right half foot portions of footwear provided with a sole of the 9th embodiment. FIG. 11 is a front cross-sectional view taken along line III-III in FIG. 10.

(overview)
When a human stands barefoot on sand, grass, or soft soil, the outside of the heel sinks because the calcaneus is located on the outside of the foot, resulting in a natural human position and stable standing and walking. Even when wearing footwear, for example shoes, creating this natural position using insoles and shoe outsoles allows for a natural human position and allows for walking that is closer to the ideal gait, where the foot strikes the outside of the heel, then passes over the outside of the metatarsal bones, and finally pushes off the ground with the toes.

The insole and footwear disclosed herein are based on the above-mentioned technical ideas. The insole is fixed to the footwear or can be attached and detached from the footwear. The footwear is worn on a person's foot when used. The insole is sometimes called an insole. The footwear has an upper and an outsole fixed to the upper. In this disclosure, several embodiments of the insole and footwear are described with reference to the drawings. In this disclosure, in the drawings for explaining the embodiments of the insole and footwear, the same parts are generally given the same reference numerals, and repeated description is omitted.

(First embodiment)
Fig. 1A is a front view of the footwear 10 seen from the heel side, and Fig. 2A is a plan view of the footwear 10 seen from directly above. Directly above means directly above in the direction of gravity. The footwear 10 is, for example, leather shoes for business use, and is configured as a set of a left half foot 11 worn on the left foot F1 and a right half foot 12 worn on the right foot F2. When the footwear 10 is viewed from above, the left half foot 11 and the right half foot 12 have symmetrical shapes, so for convenience, the left half foot 11 will be described as an example. The left half foot 11 has an upper 13, an outsole 14, and an insole 15.

As shown in FIG. 1B, the upper 13 of the left foot half 11 is a main body that accommodates the left foot F1, and the upper 13 is made of, for example, genuine leather or synthetic leather. The outsole 14 is made of, for example, genuine leather, synthetic leather, or synthetic resin. The upper 13 is fixed to the outsole 14 by sewing or vulcanization adhesion. An insole 15 is provided inside the upper 13, and the upper 13 and the insole 15 form a foot accommodation space 16 in the left foot half 11.

Furthermore, a bottom 64 is provided between the outsole 14 and the insole 15. The bottom 64 is sometimes called a midsole. The bottom 64 is a sheet-like member made of cloth, synthetic resin, or the like. The top surface of the bottom 64 is substantially flat. When the footwear 10 is viewed in plan, the outer peripheral shape of the bottom 64 and the outer peripheral shape of the insole 15 are substantially the same. The bottom 64 is fixed to the outsole 14. The insole 15 may be fixed to the bottom 64 or the outsole 14, or the insole 15 may be configured to be attached to and detached from the bottom 64 or the outsole 14. The upper 13 of the right foot half 12 is a main body portion that accommodates the right foot F2. The upper 13 and the insole 15 form a foot accommodation space 16 in the right foot half 12.

The insole 15 has a pad 60. The pad 60 provided on the left foot half 11 has a shape similar to that of the left foot half 11. The pad 60 provided on the right foot half 12 has a shape similar to that of the right foot half 12. The pad 60 has a tip 62 and a rear end 63. The tip 62 is located close to the toes, and the rear end 63 is located close to the heel of the foot. The inner surface of the upper 13 is lined, but the lining is not shown in the figure.

2A shows two tangent lines A1 and A2 tangent to both ends of the left half foot 11 in the width direction, and two tangent lines B1 and B2 tangent to both ends of the pad 60 of the insole 15 in the width direction. When the left half foot 11 is worn on the left foot F1, the tangent line A1 is closest to the big toe, and when the left half foot 11 is worn on the left foot F1, the tangent line A2 is closest to the little toe. In addition, a center line C1 is disposed between the two tangent lines A1 and A2. The center line C1 is a virtual line passing through the center of the left half foot 11 and the pad 60 of the insole 15 in the width direction. When the left half foot 11 is viewed in a plane, it is divided into an inner region D1 formed between the center line C1 and the tangent line A1, and an outer region D2 formed between the center line C1 and the tangent line A2. The four tangent lines A1, A2, B1, B2 and the center line C1 are virtual lines parallel to each other, that is, straight lines. Tangent line B1 is located between center line C1 and tangent line A1. Tangent line B2 is located between center line C1 and tangent line A2. Upper 13, pad 60 of insole 15, and outsole 14 are arranged across medial region D1 and lateral region D2.

For the right half foot 12, the tangent line A1 is closest to the big toe when the right half foot 12 is attached to the right foot F2, and the tangent line A2 is closest to the little toe when the right half foot 12 is attached to the right foot F2. For the right half foot 12, the center line C1 is an imaginary line passing through the center of the right half foot 12 and the insole 15 in the width direction. When viewed in a plane, the right half foot 12 is divided into an inner region D1 formed between the center line C1 and the tangent line A1, and an outer region D2 formed between the center line C1 and the tangent line A2. Furthermore, FIG. 2A shows the skeleton of the left foot F1 and the skeleton of the right foot F2. From the toe side to the heel side of the foot, there are the phalanges 17, metatarsals 18, tarsal bones 19, etc., and the tarsal bones 19 include the cuneiform bone, navicular bone, and calcaneus 20.

When a person wears the left half foot 11 on the left foot F1 and the right half foot 12 on the right foot F2 and stands at a predetermined location E1, the outsole 14 of the left half foot 11 and the outsole 14 of the right half foot 12 come into contact with the location E1. The location E1 may be a floor, the ground, an asphalt road, or the like. Of the two outsoles 14, the heel part 21 receives part of the person's weight from the heel of the foot, specifically, from a position corresponding to the center of gravity of the sole. When the left half foot 11 and the right half foot 12 are viewed in plan as in FIG. 2A, the center of gravity Q1 of the sole is located within the area in which the calcaneus 20 is located within the outer area D2. The center of gravity Q1 is located between the tip 62 and the rear end 63 in the direction along the center line C1.

As shown in FIG. 1A, when the heel portion 21 of the two outsoles 14 is viewed from the front, the heel portion 21 has an inner edge 30 and a side surface 31. The inner edge 30 is located in the inner region D1, that is, between the center line C1 and the tangent line A1. The side surface 31 is located in the outer region D2, that is, between the center line C1 and the tangent line A2. The inner edge 30 extends linearly along the thickness direction of the outsole 14, that is, along the height direction. The outsole 14 has an inclined surface 31A that is curved or arc-shaped and connected to the bottom surface 31B from the side surface 31. The inclined surface 31A is inclined with respect to the bottom surface 31B in both the front view of the outsole 14 shown in FIG. 1A and the side view of the outsole 14 shown in FIG. 1B. The bottom surface 31B is flat.

When the heel portion 21 of the outsole 14 is viewed from the front, the thickness of the portion corresponding to the inner region D1 is approximately constant. In other words, when the heel portion 21 of the outsole 14 is viewed from the front, the thickness near the side surface 31 located in the outer region D2 is less than the thickness of other portions of the heel portion 21. In other words, the stiffness of the outer region D2 against the compressive load in the thickness direction applied to the heel portion 21 of the outsole 14 from the heel 50 of the left foot F1 and the heel of the right foot F2 shown in FIG. 1B is lower than the stiffness of the inner region D1. Therefore, the elastic deformation amount of the outer region D2 exceeds the elastic deformation amount of the inner region D1. In other words, the load that the outsole 14 receives from the heel in the outer region D2 exceeds the load that the outsole 14 receives from the heel in the inner region D1. Specifically, the outsole 14 of the left half foot 11 and the outsole 14 of the right half foot 12 can receive the load mainly at the position corresponding to the center of gravity Q1. This allows people to stand in a stable position and walk and run in a stable position.

In the insole 15, the outsole 14 receives load from the heel 50 at the outer region D2 at a location corresponding to the outer side of the heel 50. When a person stands barefoot on sand, grass, or soft soil, the outer side of the heel 50 sinks because the calcaneus 20 is located outside the center line C1, resulting in a natural human state with a stable standing posture and stable walking. As if there was a depression similar to the shape of the calcaneus 20 on the outer side of the heel 50 in the insole 15 of footwear 10 such as business shoes, the outer side of the heel 50 sinks down in the same way as when standing barefoot on sand, grass, or soil, resulting in a stable standing posture and stable walking, and when walking, the person lands on the outer side of the heel 50, then passes over the outer side of the metatarsal 18, and finally pushes off the ground with the toes, which is closer to the ideal walking style.

Specifically, it improves your standing and walking posture, and reduces the burden on your knees, ankles, hips, etc., making you feel more comfortable. It also allows your toes to move more smoothly and increases the range of motion of your toes. It also helps to reduce and prevent bunions. It also helps to reduce and prevent splayed feet. It also helps to reduce and prevent floating toes. It also helps to reduce and prevent ingrown nails. It also improves motor function, so you can bring out the potential of your feet not just in walking or running, but in all kinds of sports. It also tightens your anus, uses the muscles in your butt (gluteus maximus), and gives you the feeling of your hips being lifted.

Second Example
FIG. 3A is a front view showing a second embodiment of the footwear 10. The plan view of the left half foot portion 11 and the right half foot portion 12 shown in FIG. 2A also applies to the footwear 10 in FIG. 3A. The footwear 10 shown in FIG. 3A is, for example, a sneaker. FIG. 3B is a side view showing the left half foot portion 11 in FIG. 3A. When viewed from the front, the heel portion 21 of the two outsoles 14 has an inner edge 30 located in the inner region D1 of FIG. 2A, a side surface 32 located in the outer region D2, and a bottom surface 32A connected to the side surface 32. The bottom surface 32A is flat. The side surface 32 is inclined with respect to the bottom surface 32A in both the front view of the outsole 14 shown in FIG. 3A and the side view of the outsole 14 shown in FIG. 3B. The thickness of the portion of the outsole 14 corresponding to the outer region D2 increases as it approaches the bottom surface 32A. In contrast, the thickness of the portion of the outsole 14 corresponding to the inner region D1 is approximately constant.

That is, when the heel portion 21 of the outsole 14 is viewed from the front, the thickness near the side surface 32 located in the outer region D2 is less than the thickness of the other parts of the heel portion 21. In other words, with respect to the compressive load in the thickness direction applied to the heel portion 21 of the outsole 14 from the heel 50 of the left foot F1 and the heel of the right foot F2 shown in FIG. 3B, the rigidity of the outer region D2 is lower than the rigidity of the inner region D1. Therefore, the load that the outsole 14 receives from the heel in the outer region D2 exceeds the load that the outsole 14 receives from the heel in the inner region D1. Therefore, the second embodiment of the footwear 10 can obtain the same effect as the first embodiment of the footwear 10. By tilting the part of footwear 10, such as business shoes, that corresponds to the outside of the heel 50 inward, the outside of the heel 50 sinks down, just like standing barefoot on sand, grass or soil, resulting in a stable standing posture that is natural to humans, and when walking, the foot lands on the outside of the heel 50, then passes over the outside of the metatarsal 18, and finally pushes off the ground with the toes, approaching the ideal walking style.

(Third Example)
FIG. 4A shows a third embodiment of the footwear 10. The plan view of the left foot half 11 and the right foot half 12 shown in FIG. 2A also applies to the footwear 10 in FIG. 4A. The footwear 10 shown in FIG. 4A is, for example, a pump. The two outsoles 14 have heel portions 25 at positions corresponding to the heels of the left foot F1 and the right foot F2. The heel portions 25 protrude in the thickness direction, i.e., in the height direction, of the outsoles 14. The heel portions 25 are, for example, a synthetic resin core covered with a wrapping leather. The heel portions 25 are fixed to the outsoles 14 by using nails. FIG. 4B is a side view of the left foot half 11 in FIG. 4A.

Figure 4A shows the center line C2 in the width direction of the heel portion 25. The center line C2 and the center line C1 intersect at an angle of 90 degrees. The center line C2 is an imaginary line that passes through the center of the upper end 29 of the heel portion 25 in the width direction of the heel portion 25. The heel portion 25 has side surfaces 26, 27, 28, and a bottom surface 28A. The side surface 26 is disposed in the inner region D1 and extends linearly. The side surface 26 is inclined with respect to the center line C2 so that it approaches the center line C2 as it moves away from the upper 13. The side surfaces 27 and 28 are disposed in the outer region D2. The upper 13, the pad 60 of the insole 15, and the heel portion 25 are disposed across the inner region D1 and the outer region D2.

The side surface 27 is connected to the outsole 14. The side surface 27 is inclined with respect to the center line C2 so as to approach the center line C2 as it moves away from the upper 13. The acute angle formed between the side surface 26 and the center line C2 is the same as the acute angle formed between the side surface 27 and the center line C2. The side surface 27 extends in a straight line. The side surface 28 is connected to the side surface 27 and the bottom surface 28A. In both the front view of the heel portion 25 shown in FIG. 4A and the side view of the heel portion 25 shown in FIG. 4B, the side surface 28 has a curved or arc shape. The bottom surface 28A is flat. The area of the tip surface of the heel portion 25 having the above configuration, that is, the lower end surface, that is, the area of the portion located in the outer region D2 is smaller than the area of the portion located in the inner region D1. The side surface 26 is inclined with respect to the center line C2. Although the connection between the side surface 26 and the bottom surface 28A is shown as an edge in FIG. 4A for convenience, the connection between the side surface 26 and the bottom surface 28A is actually chamfered into a curved or arc shape.

When a person stands with the left half foot 11 attached to the left foot F1 and the right half foot 12 attached to the right foot F2, with the lower end surfaces of the two heel parts 25 in contact with the location E1, the center of gravity Q1 is at a position corresponding to the outer region D2 of the heel part 25. The area of the tip surface of the heel part 25, that is, the area of the part of the lower end surface that is located in the outer region D2 is smaller than the area of the part that is located in the inner region D1. Therefore, the left half foot 11 is likely to tilt in a direction away from the right half foot 12 in FIG. 4A. Also, the right half foot 12 is likely to tilt in a direction away from the left half foot 11 in FIG. 4A. As a result, the load that the heel part 25 receives from the heel in the outer region D2 exceeds the load that the heel receives from the heel in the inner region D1. Therefore, the third embodiment of the footwear 10 can obtain the same effect as the first embodiment of the footwear 10. By tilting the outside of the heel 50 of footwear 10 such as pumps inward, the outside of the heel 50 sinks down, just like standing barefoot on sand, grass, or soil, resulting in a stable standing posture that is natural to humans, and when walking, the foot lands on the outside of the heel 50, then passes over the outside of the metatarsal 18, and finally pushes off the ground with the toes, approaching the ideal walking style.

(Fourth Example)
Fig. 5 shows a fourth embodiment of footwear 10. In the fourth embodiment of footwear 10, the width of heel portion 25 is narrower than the width of heel portion 25 shown in Fig. 4. Upper 13, pad 60 of insole 15, and heel portion 25 are disposed across medial region D1 and lateral region D2. Furthermore, the boundary between side surface 28 and bottom surface 28A is located on center line C2. Therefore, bottom surface 28A disposed in medial region D1 comes into contact with location E1, and the portion of heel portion 25 disposed in lateral region D2 barely comes into contact with location E1.

Therefore, the area of the part of the heel part 25 located in the outer region D2 is smaller than the area of the part located in the inner region D1. Therefore, the left half foot part 11 is likely to tilt in the direction in which the side surface 28 approaches the location E1. Also, the right half foot part 12 is likely to tilt in the direction in which the side surface 28 approaches the location E1. As a result, the load that the heel part 25 receives from the heel in the outer region D2 exceeds the load that the heel receives from the heel in the inner region D1. The fourth embodiment of the footwear 10 can achieve the same effect as the first embodiment of the footwear 10. By tilting the outer side of the heel 50 in footwear 10 such as pumps inward, the outer side of the heel 50 sinks down as if standing barefoot on sand, grass, or soil, resulting in a stable standing posture that is natural to humans, and when walking, the foot lands on the outer side of the heel 50, then passes over the outer side of the metatarsal bone 18, and finally pushes off the ground with the toes, which is closer to the ideal walking style.

Fifth Example
FIG. 6 is a front view showing a fifth embodiment of the footwear 10. The fifth embodiment of the footwear 10 is an example in which the width of the heel portion 25 narrows as it approaches the bottom surface 26A. The upper 13, the pad 60 of the insole 15, and the heel portion 25 are arranged across the medial region D1 and the lateral region D2. The side surface 26 is arranged in the medial region D1, and the side surface 27 is arranged in the lateral region D2. The distance between the upper end of the side surface 26 and the center line C2 is the same as the distance between the upper end of the side surface 27 and the center line C2. In addition, the acute angle between the side surface 26 and the center line C2 is less than the acute angle between the side surface 27 and the center line C2. In addition, the bottom surface 26A of the heel portion 25 is connected to the side surface 26 and the side surface 27. The bottom surface 26A is flat, and the connection portion between the bottom surface 26A and the side surface 26 and the connection portion between the bottom surface 26A and the side surface 27 may be any of an angular shape, a curved shape, and a circular arc shape. The bottom surface 26A is disposed across the inner region D1 and the outer region D2.

The area of the tip surface of the heel portion 25, that is, the area of the part of the bottom surface 26A that contacts the location E1 in the outer region D2 is larger than the area of the part of the bottom surface 26A that contacts the location E1 in the inner region D1. As a result, the load that the heel portion 25 receives from the heel in the outer region D2 exceeds the load that the heel receives from the heel in the inner region D1. Therefore, in the fifth embodiment of the footwear 10, the outer region D2 of the heel portion 25 is more likely to receive the load of the center of gravity Q1, and the same effect as the first embodiment of the footwear 10 can be obtained. As in the example described in FIG. 2A, the position of the calcaneus 20, which is most heavily loaded by the body, is located on the outer side of the foot from the center line C1, so that by shifting the position of the heel portion 25 of the footwear 10 outward to match the position of the calcaneus 20, the heel portion 25 of the footwear 10 can receive the load firmly, reducing the burden on the ankle and knee and stabilizing posture. When walking, you can land on the outside of your heel 50, then on the outside of your metatarsal 18, and finally push off the ground with your toes, which is closer to the ideal way to walk.

(Sixth Example)
FIG. 7 shows a sixth embodiment of the footwear 10. The sixth embodiment of the footwear 10 is an example in which the width of the heel portion 25 narrows as it approaches the bottom surface 26A. The width of the heel portion 25 shown in FIG. 7 is less than the width of the heel portion 25 shown in FIG. 6. The upper 13, the pad 60 of the insole 15, and the heel portion 25 are disposed across the medial region D1 and the lateral region D2. The acute angle between the side surface 26 and the center line C2 is the same as the acute angle between the side surface 27 and the center line C2. The distance between the upper end of the side surface 26 and the center line C2 is less than the distance between the upper end of the side surface 27 and the center line C2. Therefore, the area of the tip surface of the heel portion 25, that is, the area of the portion of the bottom surface 26A that contacts the location E1 in the lateral region D2 is greater than the area of the portion of the bottom surface 26A that contacts the location E1 in the medial region D1. Therefore, in the sixth embodiment of the footwear 10, the outer region D2 of the heel portion 25 is more likely to receive the load of the center of gravity Q1, and the same effect as the first embodiment of the footwear 10 can be obtained. As in the example described in Fig. 2A, the position of the calcaneus 20, which receives the most weight from the body, is located on the outer side of the foot from the center line C1, so by shifting the position of the heel portion 25 of the footwear 10 outward to match the position of the calcaneus 20, the heel portion 25 of the footwear 10 can receive the load firmly, reducing the burden on the ankle and knee and stabilizing posture. Even when walking, it is possible to approach an ideal walking style in which the foot lands on the outside of the heel 50, then passes over the outside of the metatarsal 18, and finally pushes off the ground with the toes.

Seventh Example
The insole 15 shown in FIG. 2A can be used in all of the first, second, third, fourth, fifth, and sixth embodiments of the footwear 10. As shown in FIG. 2B and FIG. 9, the two insoles 15 have a pad 60, a rising portion 61 rising from the outer periphery of the pad 60, and a hole 40 penetrating the pad 60 in the thickness direction. The rising portion 61 is provided so as to curve from the outer periphery of the pad 60. The rising portion 61 is provided in a region extending from the approximate center to the rear end 63 in the front-rear direction along the center line C1. The pad 60 is in contact with a part of the lower surface of the heel 50 of the left foot F1 and a part of the lower surface of the heel of the right foot F2, and the rising portion 61 is in contact with a part of the side surface of the heel 50 of the left foot F1 and a part of the side surface of the heel of the right foot F2.

When the insole 15 is viewed in a plan view, the hole 40 is disposed between the approximate center of the insole 15 and the rear end 63 in the direction along the center line C1. When the insole 15 is viewed in a plan view, the inner peripheral shape of the hole 40 is preferably the same as the shape of the lower end 20A of the calcaneus 20 shown in FIG. 9 when viewed in a plan view. The center of gravity Q1 is located within the region in which the hole 40 is provided. When the insole 15 is viewed in a plan view, the center of gravity Q1 is located at the approximate center of the hole 40 in the direction along the center line C1. Also, when the insole 15 is viewed in a plan view, the area of the portion of the hole 40 that is disposed in the outer region D2 exceeds the area of the portion of the hole 40 that is disposed in the inner region D1. When the insole 15 is viewed in a plan view, the planar shape of the portion of the hole 40 that is disposed in the inner region D1 is, for example, a crescent shape. When the insole 15 is viewed in a plan view, the planar shape of the portion of the hole 40 that is disposed in the outer region D2 is, for example, a trapezoid shape. When the insole 15 is viewed from above, the rear end of the portion of the hole 40 that is located in the outer region D2 is located between the rear end of the portion of the hole 40 that is located in the inner region D1 and the rear end 63 of the pad 60. Note that when the insole 15 is viewed from above, the inner peripheral shape of the hole 40 may be circular, elliptical, or another shape.

Furthermore, a part of the hole 40 is provided in the rising portion 61. The inner peripheral surface of the hole 40 is gently curved and connected to the inner and outer surfaces of the pad 60. As shown in FIG. 2B, when the left half foot portion 11 and the right half foot portion 12 are viewed in vertical section from the front side, the inner peripheral surface of the hole 40 is inclined with respect to the upper surface of the bottom portion 64. The inner peripheral surface of the hole 40 is inclined in a direction in which the width of the hole 40 narrows as the hole 40 approaches the bottom portion 64. In the vertical section in the width direction of the left half foot portion 11, the acute angle θ1 formed between the part of the inner peripheral surface of the hole 40 located in the inner region D1 and the upper surface of the bottom portion 64 is less than the acute angle θ2 formed between the part of the inner peripheral surface of the hole 40 located in the outer region D2 and the upper surface of the bottom portion 64. Both angles θ1 and θ2 are less than 90 degrees.

2A and 9, the surface of the insole 15 has a support portion 65 that protrudes in the thickness direction. When the insole 15 is viewed in a plan view, the shape of the support portion 65 may be any of an ellipse, a circle, and the like. When the insole 15 is viewed in a plan view, the arrangement area of the support portion 65 may be provided in the area where the metatarsal bones 18 are located, or may be provided across the area where both the metatarsal bones 18 and the tarsal bones 19 are located.

When a person stands at location E1 with the left half foot 11 attached to the left foot F1 and the right half foot 12 attached to the right foot F2, a portion of the underside of the heel 50 of the left foot F1 and a portion of the underside of the heel 50 of the right foot F2 each sink into the hole 40 of the insole 15. As a result, the 28 bones of each of the left foot F1 and right foot F2 are in their normal positions. As a result, the load that the outsole 14 receives from the heel in the outer region D2 exceeds the load that the outsole 14 receives from the heel 50 in the inner region D1. This further enhances the effects described in the first embodiment of the footwear 10.

When the insole 15 has holes 40, the bones of the left foot F1 and the right foot F2 are raised, and a gap is created between the bottom surface of the left foot F1 and the bottom surface of the right foot F2 and the insole 15. In addition, the support part 65 supports the bottom surface of the left foot F1 and the bottom surface of the right foot F2. This makes it easier for the left foot F1 and the right foot F2 to have an arch shape in the width direction. This makes it easier to absorb impact from the ground, and reduces the burden on the knees, ankles, and hips of the left foot F1 and the right foot F2. In addition, since the support part 65 is located in the gap between the bottom surface of the left foot F1 and the bottom surface of the right foot F2 and the insole 15, it is more effective to keep a part of the bottom surface of the heel 50 of the left foot F1 and a part of the bottom surface of the heel of the right foot F2 sinking into the hole 40 of the insole 15.

Furthermore, the inner peripheral surface of the hole 40 is inclined with respect to the upper surface of the bottom 64. In the width direction of the left half foot part 11, the acute angle θ1 formed between the part of the inner peripheral surface of the hole 40 located in the inner region D1 and the upper surface of the bottom 64 is less than the acute angle θ2 formed between the part of the inner peripheral surface of the hole 40 located in the outer region D2 and the upper surface of the bottom 64. Both angles θ1 and θ2 are less than 90 degrees. Therefore, the lower surface of the heel 50 is easily able to sink smoothly along the inner peripheral surface of the hole 40, and the heel 50 is positioned in the width direction relative to the insole 15 by being supported by the part of the lower surface of the heel 50 closer to the little toe on the inner peripheral surface of the hole 40.

As a result, the lower end 20A of the calcaneus 20 can be maintained in a position directly above the hole 40, and the load that the heel portion 21 receives from the heel 50 at a position corresponding to the outer region D2 can be made to exceed the load that the heel portion 21 receives from the heel 50 at a position corresponding to the inner region D1, thereby further enhancing the effect of the first embodiment.

Eighth Example
The insole 15 shown in Fig. 8 can be used in all of the first, second, third, fourth, fifth and sixth embodiments of the footwear 10. The pads 60 of the two insoles 15 are each provided with a cutout portion 41. The shape of the cutout portion 41 is arbitrary. The center of gravity Q1 is located within the region in which the cutout portion 41 is provided. The area of the cutout portion 41 that is disposed in the outer region D2 exceeds the area of the cutout portion 41 that is disposed in the inner region D1.

When a person stands at location E1 with the left half foot 11 attached to the left foot F1 and the right half foot 12 attached to the right foot F2, the heel 50 of the left foot F1 and a part of the surface of the heel of the right foot F2 each sink into the cutout portion 41 of the insole 15. As a result, the load that the outsole 14 receives from the heel in the outer region D2 exceeds the load that the outsole receives from the heel in the inner region D1. This further enhances the effects described in the first embodiment of the footwear 10.

2A and 8 can be installed in the foot storage chamber of footwear having an outsole that does not have a chamfered side surface 31 or inclined sides 27, 28, 32. In this case, when a person stands on a surface with the left half foot part attached to the left foot and the right half foot part attached to the right foot, a part of the surface of the heel of the left foot and the heel of the right foot sink into the hole 40 or the notch 41 of the insole 15, respectively. Therefore, the load that the outsole receives from the heel in the outer region D2 exceeds the load that the outsole receives from the heel in the inner region D1. Therefore, the same effect as that described in the first embodiment of the footwear can be obtained.

Ninth Example
Neither the left foot half 11 nor the right foot half 12 shown in Figures 10 and 11 has the insole 15 described above. The bottom 64 provided on each of the left foot half 11 and the right foot half 12 has a recess 66. When the bottom 64 is viewed in a plan view from directly above, the recess 66 is disposed between approximately the center of the bottom 64 and the rear end 67 in the direction along the center line C1. The upper surface of the bottom 64 faces the foot receiving space 16, and the recess 66 is provided on the upper surface of the bottom 64. The recess 66 is formed by depressing a portion of the upper surface of the bottom 64 in the thickness direction of the bottom 64.

When the bottom 64 is viewed in a plan view, the recess 66 is disposed between the approximate center of the bottom 64 and the rear end 67 in the direction along the center line C1. When the bottom 64 is viewed in a plan view, the shape of the recess 66 is preferably the same as the shape of the lower end 20A of the calcaneus 20 shown in FIG. 9 when viewed in a plan view. The center of gravity Q1 is located within the region in which the recess 66 is provided. When the bottom 64 is viewed in a plan view, the center of gravity Q1 is located at the approximate center of the recess 66 in the direction along the center line C1. Also, when the bottom 64 is viewed in a plan view, the area of the portion of the recess 66 that is disposed in the outer region D2 exceeds the area of the portion of the recess 66 that is disposed in the inner region D1. When the bottom 64 is viewed in a plan view, the planar shape of the portion of the recess 66 that is disposed in the inner region D1 is, for example, a half-moon shape. When the bottom 64 is viewed in a plan view, the planar shape of the portion of the recess 66 that is disposed in the outer region D2 is, for example, a trapezoid shape. When the bottom 64 is viewed in plan, the rear end of the portion of the recess 66 that is located in the outer region D2 is located between the rear end of the portion of the recess 66 that is located in the inner region D1 and the rear end 67 of the bottom 64. Note that when the bottom 64 is viewed in plan, the shape of the recess 66 may be circular, elliptical, or another shape.

When the left half foot 11 is attached to the left foot F1 and the right half foot 12 is attached to the right foot F2 and the person stands at the location E1, a part of the underside of the heel 50 of the left foot F1 and a part of the underside of the heel 50 of the right foot F2 sink into the recess 66 of the bottom 64. As a result, the 28 bones of each of the left foot F1 and the right foot F2 are in their normal positions. Therefore, the load that the outsole 14 receives from the heel in the outer region D2 exceeds the load that the outsole receives from the heel in the inner region D1. Therefore, the same effect as that described in the first embodiment of the footwear 10 can be obtained. The bottom 64 in FIG. 10 and FIG. 11 can be used in all of the first embodiment of the footwear 10, the second embodiment of the footwear 10, the third embodiment of the footwear 10, the fourth embodiment of the footwear 10, the fifth embodiment of the footwear 10, the sixth embodiment of the footwear 10, the seventh embodiment of the footwear 10, and the eighth embodiment of the footwear 10.

When the left foot half 11 and the right foot half 12 each have both an insole 15 having a hole 40 and a bottom 64 having a recess 66, the arrangement area of the hole 40 and the arrangement area of the recess 66 overlap at least partially when the insole 15 is viewed in a plane. When the left foot half 11 and the right foot half 12 each have both an insole 15 having a cutout portion 41 and a bottom 64 having a recess 66, the arrangement area of the cutout portion 41 and the arrangement area of the recess 66 overlap at least partially when the insole 15 is viewed in a plane.

(supplementary explanation)
When a person stands barefoot on sand, grass, or soft soil, as explained in the examples of Figures 2A and 8, the heel (outside) of the foot sinks in due to the calcaneus 20 being located outside the center line C1, resulting in a correct standing posture that is natural to humans, and stable standing posture and stable walking. By creating this natural state using the insole, sole, and heel part of the footwear, even when wearing footwear, the person can achieve a stable standing posture that is natural to humans, and when walking, the person can land on the outside of the heel, then pass through the outside of the metatarsal bone, and finally push off the ground with the toes, which is closer to an ideal walk. The insole, footwear with an outsole, and footwear with a sole of the present disclosure can all achieve this effect.

An example of the technical meaning of the matters described in this embodiment is as follows. The upper 13 is an example of a main body portion. The outsole 14, the heel portion 21, and the heel portion 25 are examples of a ground contact portion. The footwear 10 is an example of footwear. The center line C1 is an example of a center line. The inner region D1 is an example of an inner region. The outer region D2 is an example of an outer region. The angle θ1 is an example of a first angle, and the angle θ2 is an example of a second angle. The bottom portion 64 is an example of a bottom portion. The recess 66 is an example of a recess. The chamfer provided on the side surface 31, the inclined surface constituting the side surface 32, and the side surfaces 27 and 28 are examples of a setting mechanism. The sides 27, 28, 30, 31, and 32 are examples of side surfaces. The foot accommodation space 16 is an example of a foot accommodation space.

The insole 15 is an example of an insole. The pad 60 is an example of a pad. The hole 40 and the cutout 41 are each an example of an auxiliary mechanism. Instead of the hole or cutout in the insole, a recess or depression may be provided, making the thickness of the insole thinner in some places than in other places. Furthermore, in each figure, the heel, heel part, outsole, and other elements are shown to have corners, but this is merely for illustration purposes, and in reality, these parts are smoothly chamfered or have a smoothly curved shape.

The present disclosure can be used as an insole and footwear that is placed in footwear worn on a person's foot.

10...footwear, 13...upper, 14...outsole, 15...insole, 16...foot storage space, 21...heel, 25...heel, 27, 28, 30, 31, 32...side, 40...hole, 41...cutout, 60...pad, 64...bottom, 66...recess, C1...center line, D1...inner region, D2...outer region, θ1, θ2...angle

Claims (8)

An insole having a pad for placement in a foot receiving space of footwear,
The pad is divided into an inner region and an outer region that are arranged across a center line in a width direction of the pad when viewed in a plan view,
In a plan view of the pad, the medial region is a region where the big toe is located,
In a plan view of the pad, the outer region is a region where the little toe is located,
the pad has an auxiliary mechanism formed of a hole penetrating the pad in a thickness direction, the auxiliary mechanism causing a load received from the heel of the foot at a position where the ground contact portion of the footwear corresponds to the lateral region to exceed a load received from the heel of the foot at a position where the ground contact portion corresponds to the medial region ;
The hole has a position corresponding to the center of gravity of the sole within the area where the pad is provided in a plan view of the pad, and is arranged so that the lower end of the calcaneus of the foot is located directly above the hole,
an inner circumferential shape is provided across the inner region and the outer region, an area of the portion disposed in the outer region exceeds an area of the portion disposed in the inner region, and a planar shape of the portion disposed in the inner region is a half-moon shape;
The planar shape of the portion disposed in the outer region is a trapezoid,
The rear end of the portion disposed in the outer region is located between the rear end of the portion disposed in the inner region of the hole and the rear end of the pad,
The insole is shaped like the lower end of the calcaneus of the foot when viewed in plan . 2. The insole according to claim 1, wherein the auxiliary mechanism is constituted by a recess formed by recessing the pad in the thickness direction, instead of the hole. Footwear having a body portion into which a person's foot is inserted and a ground contact portion fixed to the body portion and grounded,
The main body portion includes a foot receiving space into which the feet are inserted,
The insole according to claim 1 is provided in the foot receiving space,
The main body portion is divided into a main body portion inner region and a main body portion outer region that are arranged across a center line in a width direction of the main body portion when viewed in a plan view of the main body portion,
In a plan view of the main body, the main body inner region is a region where the big toe is located, and the main body outer region is a region where the little toe is located,
The ground portion is disposed across the main body inner region and the main body outer region in a plan view of the main body portion,
a setting mechanism for causing a load received from the heel of the foot at a position where the ground contact portion corresponds to the lateral region to exceed a load received from the heel of the foot at a position where the ground contact portion corresponds to the medial region,
The setting mechanism is characterized in that, when viewed from the front from the heel side of the foot, the thickness of the area corresponding to the inner region of the main body is approximately constant, and the thickness of the area corresponding to the outer region of the main body is less than the thickness of the area corresponding to the inner region of the main body. Footwear as described in claim 3, characterized in that the thickness of the setting mechanism corresponding to the outer region of the main body increases as the thickness approaches the inner region of the main body when viewed from the front from the heel side of the foot. 4. The footwear according to claim 3, wherein the assist mechanism is constituted by a recess formed by recessing the pad in a thickness direction, instead of the hole. Footwear having a body portion into which a person's foot is inserted and a ground contact portion fixed to the body portion and grounded,
The main body portion is divided into an inner region and an outer region arranged across a center line in a width direction of the main body portion in a plan view of the main body portion,
In a plan view of the main body portion, the medial region is a region where the big toe is located,
the lateral region is the region where the little toe is located,
The ground portion is disposed across the inner region and the outer region in a plan view of the main body portion,
The main body has a foot receiving space into which the feet are inserted, and is fixed to the grounding portion and is provided with a bottom portion that forms the foot receiving space;
the bottom portion has an auxiliary mechanism, at a portion facing the foot receiving space and on which the heel of the foot is placed, which is a recess, for making a load received from the heel of the foot at a position where the ground contact portion of the footwear corresponds to the lateral region exceed a load received from the heel of the foot at a position where the ground contact portion corresponds to the medial region;
The recess has a position corresponding to the center of gravity of the sole within the region in which the recess is provided in a plan view of the main body, and is disposed so that the lower end of the calcaneus of the foot is located directly above the recess;
an inner circumferential shape is provided across the inner region and the outer region, an area of the portion disposed in the outer region exceeds an area of the portion disposed in the inner region, and a planar shape of the portion disposed in the inner region is a half-moon shape;
The planar shape of the portion disposed in the outer region is a trapezoid,
The rear end of the portion disposed in the outer region is located between the rear end of the portion disposed in the inner region of the recess and the rear end of the bottom,
Footwear characterized in that it has a shape of the lower end of the calcaneus of the foot when viewed in plan . a setting mechanism for causing a load received from the heel of the foot at a position where the ground contact portion corresponds to the lateral region to exceed a load received from the heel of the foot at a position where the ground contact portion corresponds to the medial region,
Footwear as described in claim 6, characterized in that the setting mechanism is configured such that, when viewed from the front from the heel side of the foot, the thickness of the portion corresponding to the inner region of the main body is approximately constant, and the thickness of the portion corresponding to the outer region of the main body is less than the thickness of the portion corresponding to the inner region of the main body. Footwear as described in claim 7, characterized in that the thickness of the setting mechanism corresponding to the outer region of the main body increases as the thickness approaches the inner region of the main body when viewed from the front from the heel side of the foot.