Shoe sole adjusters and shoes

Abstract

To provide a shoe sole adjuster and shoes that reduce various foot disorders by making it easier for the user to bring their feet closer to an ideal arch structure without them having to consciously think about it. [Solution] A shoe sole adjuster 1 is placed in the insole 5 of a shoe to correct the arch structure of the user's foot, and has opposing surfaces 20b, 30b facing the insole 5, wall surfaces 20c, 30c extending upward from the opposing surfaces 20b, 30b, and inclined surfaces 20d, 30d facing a part of the user's cuboid bone and at least the user's third and fourth metatarsals, and inclined from the upper ends of the wall surfaces 20c, 30c toward the little toe side of the opposing surfaces 20b, 30b, and is provided with central projections 20, 30 protruding from the surface of the insole 5, and the toe-side ends of the wall surfaces 20c, 30c face within the range from the fourth metatarsal bone to the second metatarsal bone.

Description

Technical Field

[0001] The present invention relates to a shoe sole adjuster and a shoe.

Background Art

[0002] Originally, the foot has three arch structures, but due to its complex skeletal structure, it can be unstable, making it prone to collapse. Therefore, when the arch structure collapses due to some factor, various foot disorders such as hallux valgus are likely to occur. Thus, conventionally, a technique has been proposed to approximate an ideal arch structure by providing protrusions on the sole of the foot.

[0003] Conventionally, as a technique of this kind, there is the technique described in Patent Document 1. Patent Document 1 discloses an insole adjustment method used as an insole of a shoe to intentionally induce the COP (Center of Pressure) so that the COP does not shift excessively outward during sports. The insole is a sole having a certain thickness molded to fit the inner shape of the shoe, divided into three regions: the forefoot region, the midfoot region, and the rearfoot region. On the outer side of any one or a combination of two or more regions of the forefoot region, the midfoot region, and the rearfoot region, there are provided an outer forefoot convex portion, an outer midfoot convex portion, and an outer rearfoot convex portion that protrude upward from the upper surface or downward from the lower surface of the insole. The protruding heights of the outer forefoot convex portion, the outer midfoot convex portion, and the outer rearfoot convex portion are in the range of 0.2 mm or more and 15 mm or less, and are adjusted to optimal height dimensions by attaching or cutting the outer forefoot convex portion, the outer midfoot convex portion, and the outer rearfoot convex portion to the sole according to the physical condition of the user.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] Incidentally, when the arch of the foot is properly aligned, the contact area of ​​the sole of the foot in a standing position is from the calcaneus to the cuboid, the fifth metatarsal, the fourth metatarsal, and the area anterior to the MTP joint from the fifth to the first toe. Furthermore, when the center of gravity can be maintained around the ankle, that is, near the center of the talus, the arch structure of the foot can be utilized to support weight in a balanced manner across the entire sole.

[0006] Furthermore, when walking with a properly arched foot, lifting the heel causes the contact surface of the sole of the foot to move forward from the calcaneus to the cuboid, then to the fifth and fourth metatarsals, and the contact surface to move from the MTP joint of the fifth toe to the MTP joints of the fourth and third toes, before lifting off from the tip of the second toe.

[0007] However, if the arch collapses, when standing, the center of gravity tends to be positioned in front of the ankle, making it difficult for the arch structure to distribute weight effectively, and constantly putting pressure on the front of the foot. Furthermore, when walking, as the heel is lifted, the contact surface shifts from the heel towards the ball of the big toe rather than from the 5th and 4th metatarsals to the MTP joint, increasing the burden on the ball of the big toe and making it easier to develop various problems such as bunions.

[0008] Therefore, it is conceivable to add a protrusion to the sole of the shoe to correct the arch structure so that the load on the area around the ball of the foot is reduced. However, unless the user understands the meaning of the protrusion and consciously tilts the sole of their foot to approach the ideal arch structure, the effect of reducing various foot disorders will not be obtained. For example, even if a protrusion is added to the sole of the shoe to lower the little toe side and reduce the load on the ball of the foot in order to prevent bunions, if the user tilts the ball of their foot downward, the effect of preventing bunions will not be obtained.

[0009] The present invention was made to solve the aforementioned problems, and aims to provide a shoe sole adjuster and shoes that make it easier for the user to bring the foot closer to an ideal arch structure both when standing and walking, without the user being conscious of it, thereby reducing various foot disorders. [Means for solving the problem]

[0010] The shoe sole adjuster and shoe of the present invention have the following configuration.

[0011] The shoe sole adjuster of the present invention is a shoe sole adjuster (e.g., shoe sole adjuster 1) that is placed on the sole of a shoe (e.g., insole 5) and corrects the arch structure of the user's foot, The shoe has opposing surfaces (e.g., opposing surfaces 20b, 30b) facing the sole, wall surfaces (e.g., wall surfaces 20c, 30c) rising above the opposing surfaces, and inclined surfaces (e.g., inclined surfaces 20d, 30d) that face the user's cuboid bone and part of the lateral cuneiform bone and at least the user's third and fourth metatarsals, and that slope from the upper end of the wall surface toward the little toe side of the opposing surface, and is equipped with central projections (e.g., first central projection 20, second central projection 30) protruding from the surface of the sole, The toe-side end of the aforementioned wall surface is characterized in that it faces any range from the fourth metatarsal bone to the second metatarsal bone.

[0012] With the present invention configured in this way, the sole of the foot rests on the inclined surface of the central projection, causing the outer edge of the user's sole to tilt downwards, and the opposite side, the big toe, to lift more easily, thereby reducing the load on the big toe. Furthermore, since the wall surface is erected above the opposing surface, the contact between the user's sole and the wall surface is reduced. As a result, the user becomes aware of the part of their sole that is in contact with the wall, and can avoid pressing the big toe against the sole without being too conscious of it, thereby reducing the load on the big toe. This can reduce the occurrence of bunions and other foot problems. Thus, with the present invention, by wearing shoes to which the sole adjuster of this embodiment is applied and standing, the user can bring their feet closer to an ideal arch structure, thereby reducing various foot problems.

[0013] Furthermore, the shoe sole adjuster of the present invention is characterized by including a first central projection (e.g., a first central projection 20) that extends from a part of the user's cuboid bone through a part of the lateral cuneiform bone to the central part of the user's third and fourth metatarsals, and a second central projection (e.g., a second central projection 30) that is positioned at a predetermined distance from the first central projection and extends to the tip of at least one of the second to fourth metatarsals.

[0014] With the present invention configured in this way, by dividing the central projection into a first central projection and a second central projection, it becomes possible to easily fix the central projection not only in the soles of shoes with low heels, such as men's dress shoes, but also in the soles of shoes with high heels, such as pumps, by dividing it into a part where the slanted side of the user's arch faces outwards and a part where the horizontal side of the user's toes faces outwards.

[0015] Furthermore, the shoe sole adjuster of the present invention further comprises a heel projection (for example, a heel projection 10) positioned on the heel side and inner edge of the shoe sole and protruding from the surface of the shoe sole, The calcaneal process is characterized by being located posterior to the arch of the user's foot, below the tip of the talus, on the medial side of the tip of the calcaneus, and having an inclined surface that slopes toward the little toe. In a specific embodiment, the calcaneal process is characterized by having an inclined surface that slopes toward the little toe side or toward the anterior medial side of the calcaneus in the portion that abuts the user's foot, spanning either the area below the talus and navicular bones to the anterior medial side of the calcaneus at the posterior side of the arch of the foot.

[0016] With the present invention configured in this way, the user's heel rests on the inclined surface of the heel protrusion, causing the little toe side of the user's sole to tilt downwards. As a result, the opposite side, the big toe side, is less likely to be pressed against the sole of the shoe, thus reducing the load on the big toe side.

[0017] Furthermore, the shoe sole adjuster of the present invention is characterized by further comprising stopper protrusions (for example, stopper protrusions 40, 50) positioned in the center of the user's second and third proximal phalanges and protruding from the surface of the shoe sole so that they can be gripped by the user's second and third toes.

[0018] With the present invention configured in this way, the user can position their toes so that they grip the stopper projection with their third and second toes, and can point their toes towards the bottom surface. This is expected to facilitate the formation of the arch structure of the user's foot.

[0019] Furthermore, the shoe of the present invention is characterized by having the aforementioned sole adjuster.

[0020] With the present invention configured in this way, when a user wears shoes to which the sole adjuster of this embodiment is applied and assumes a standing position, the sole of the foot rests on the central protrusion, allowing the user to bring their foot closer to an ideal arch structure without conscious effort, thereby alleviating various foot disorders. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a shoe sole adjuster and shoes that can alleviate various foot disorders by making it easier for the user to bring their feet closer to an ideal arch structure without them having to be conscious of it.

Brief Description of the Drawings

[0022] [Figure 1] It is a perspective view showing the appearance of the sole adjuster 1 in one embodiment of the present invention as seen from the big toe side. [Figure 2] It is a perspective view showing the appearance of the sole adjuster 1 in one embodiment of the present invention as seen from the little toe side. [Figure 3] It is a sectional view taken along line XX in FIG. 1. [Figure 4] It is an explanatory view showing the arrangement of the heel protrusion 10, the first central protrusion 20, the second central protrusion 30, and the stopper protrusions 40 and 50 in the sole adjuster 1. [Figure 5] It is an explanatory view showing a modified example of the sole adjuster 1 in one embodiment of the present invention.

Modes for Carrying Out the Invention

[0023] Hereinafter, the present invention will be described more specifically using preferred embodiments. However, the following embodiments are merely examples embodying the present invention, and the present invention is not limited thereto.

[0024] The configuration of the sole adjuster 1 in one embodiment of the present invention will be described.

[0025] FIG. 1 is a perspective view showing the appearance of the sole adjuster 1 in one embodiment of the present invention as seen from the big toe side. FIG. 2 is a perspective view showing the appearance of the sole adjuster 1 in one embodiment of the present invention as seen from the little toe side. FIG. 3 is a sectional view taken along line XX in FIG. 1. Note that FIGS. 1 and 2 show the sole adjuster 1 mounted on the insole of a women's pump for the left foot. Hereinafter, the sole adjuster 1 for the left foot will be described, and since the sole adjuster 1 for the right foot is mirror-symmetrical to the sole adjuster 1 for the left foot, detailed description thereof will be omitted. Also, for the convenience of the following description, the toe side with respect to the center of the sole adjuster 1 may be referred to as the front side, the heel side as the rear side, the little toe side as the outer side, and the big toe side as the inner side.

[0026] [Sole Adjuster 1] The sole adjuster 1 comprises a heel projection 10, a first central projection 20, a second central projection 30, and stopper projections 40 and 50. The sole adjuster 1 is placed on the sole of the shoe. In this embodiment, "sole" is not limited to the part that forms the bottom surface of the shoe itself, but also includes the insole, also known as the inner sole, which is placed inside the shoe. A covering material made of vinyl, leather, or the like may be placed on top of the sole adjuster 1 to prevent it from directly contacting the user's foot.

[0027] An example of a shoe sole is an insole 5, which is placed inside the shoe and is a flexible, plate-shaped member made of urethane, sponge, wool, leather, fiber, etc., that conforms to the outer circumference of the foot and the surface shape of the outsole. The insole 5 may be a so-called insole that is fixed to the shoe, a member with a pad attached to the insole, an insole placed on top of this member, or a member that is removable from the shoe.

[0028] The heel projection 10, the first central projection 20, the second central projection 30, and the stopper projections 40 and 50 are made of rubber material, EVA urethane material, etc., and are arranged on the surface of the insole 5 to form protruding portions on the surface of the insole 5.

[0029] The heel projection 10 adjusts the inclination near the heel of the user's foot, the first central projection 20 adjusts the inclination near the outer side of the arch of the foot, the second central projection 30 adjusts the inclination from the arch of the foot to the base of the toes, and the stopper projections 40 and 50 make it easier to maintain an arch structure by pointing the toes towards the ground and restrict the movement of the toes towards the front of the shoe.

[0030] The heel projection 10 has a roughly comb-like shape, resembling a rugby ball divided into quarters along its longitudinal direction. The heel projection 10 is positioned on the heel side and inner edge of the insole 5, with one of the two comb-shaped surfaces fixed to the insole 5 by adhesive or double-sided adhesive tape, and the other surface contacting the heel slide of the pump. The curved surface formed between the two comb-shaped surfaces is an inclined surface that slopes downward from the inside to the outside and bulges diagonally upward. That is, this inclined surface slopes toward the little toe at the part of the user's foot that contacts the area spanning from the lower part of the talus and navicular bone to the anterior medial part of the calcaneus behind the arch of the foot.

[0031] The first central projection 20, the second central projection 30, and the stopper projections 40 and 50 are arranged near the center of the insole 5, in the order of the first central projection 20, the second central projection 30, and the stopper projections 40 and 50, from the heel side to the toe side.

[0032] The first central projection 20 has a roughly right-angled triangular base 20a on the toe side, and is a long, roughly conical shape extending from this base 20a toward the heel. In addition to the roughly right-angled triangular base 20a, it has an opposing surface 20b facing the insole 5, a wall surface 20c extending perpendicularly upward from one side of the opposing surface 20b, and an inclined surface 20d extending from the upper end of the wall surface to the other side of the opposing surface 20b. The opposing surface 20b, the wall surface 20c, and the inclined surface 20d are roughly triangular.

[0033] The hypotenuse of the nearly right triangle on the base 20a is a convex, gently sloping arc, and one side of the base 20a on which the wall 20c extends is shorter than the other side of the base 20a on which the opposing surface 20b extends. The wall 20c has a lower side that becomes one side of the opposing surface 20b extending from the base 20a and an upper side that becomes one side of the inclined surface 20d. The upper side of the wall 20c is a convex, gently sloping arc. The opposing surface 20b has an inner side that becomes one side of the wall 20c extending from the base 20a and an outer side that becomes one side of the inclined surface 20d. The outer side of the opposing surface 20b is a convex, gently sloping arc. The three sides of the triangle that make up the inclined surface 20d are convex, gently sloping arcs. Therefore, as shown in Figure 3, the inclined surface 20d slopes gently downwards, bulging outwards.

[0034] The second central projection 30 has a roughly right-angled triangular base 30a on the heel side, and is a short, roughly conical shape extending from this base 30a toward the toe. In addition to the roughly right-angled triangular base 30a, it has an opposing surface 30b facing the insole 5, a wall surface 30c extending perpendicularly from one side of the opposing surface 30b, and an inclined surface 30d extending from the upper end of the wall surface 30c toward the other side of the opposing surface 30b. The opposing surface 30b, the wall surface 30c, and the inclined surface 30d are roughly triangular.

[0035] The hypotenuse of the nearly right triangle on the base 30a is a convex, gently sloping arc, and one side of the base 30a onto which the wall 30c extends is shorter than the other side of the base 20a onto which the opposing surface 30b extends. The wall 30c has a lower side that becomes one side of the opposing surface 30b extending from the base 30a, and an upper side that becomes one side of the inclined surface 30d. The upper side of the wall 30c is a convex, gently sloping arc. The opposing surface 30b has an inner side that becomes one side of the wall 30c extending from the base 30a, and an outer side that becomes one side of the inclined surface 30d. The outer side of the opposing surface 30b is a convex, gently sloping arc. The three sides of the triangle that make up the inclined surface 30d are convex, gently sloping arcs. Therefore, the inclined surface 30d slopes gently downwards, bulging outwards and toward the toes.

[0036] In the examples shown in Figures 1 and 2, the first central projection 20 is positioned on the surface of the insole 5 where the slanted arch of the user's foot faces the opposite side, and the second central projection 30 is positioned where the horizontal toe side of the user faces the opposite side. At this time, the bottom surface 30a of the second central projection 30 is positioned to face the bottom surface 20a of the first central projection 20.

[0037] The first central projection 20 and the second central projection 30 are fixed to the insole 5 by, for example, attaching the surface of the insole 5 to the opposing surfaces 20b and 30b using adhesive or double-sided adhesive tape.

[0038] The stopper protrusions 40 and 50 are arranged in the width direction of the insole 5 near the toe area, with their roughly triangular pyramidal bases facing each other. In this embodiment, the stopper protrusion 40 is positioned on the outside and the stopper protrusion 50 is positioned on the inside. The stopper protrusions 40 and 50 are arranged with their curved portions facing the heel, and their opposing roughly triangular pyramidal bases widened in a V-shape so that the pair of curved portions approach a straight line.

[0039] The stopper protrusions 40 and 50 are fixed to the insole 5, for example, by adhesive or double-sided adhesive tape.

[0040] Figure 4 is an explanatory diagram showing the arrangement of the heel projection 10, the first central projection 20, the second central projection 30, and the stopper projections 40 and 50 in the sole adjustment device 1.

[0041] The calcaneal process 10 is located posterior to the arch of the foot, spanning from the lower part of the talus and navicular bone to the anterior medial part of the calcaneus. The anterior part of the calcaneal process 10 is located not beyond the lower part of the navicular bone, and the posterior part of the calcaneal process 10 is included in the area of ​​the lower part of the talus.

[0042] The first central process 20 is positioned from the articulation portion with the calcaneus at the posterior end of the cuboid bone, through the cuboid bone and lateral cuneiform bone, to the central portion of the third and fourth metatarsals. In this case, both anterior ends of the first central process 20 are positioned between the second and third metatarsals and between the fourth and fifth metatarsals. In other words, the anterior ends of the upper edges of the wall surface 20c are positioned between the second and third metatarsals.

[0043] The second central process 30 is positioned in the area from the central part of the third and fourth metatarsals to the tips of the third and fourth metatarsals, plus the medial half of the second metatarsal bone from the central part to the tip. In other words, the upper edge of the wall surface 30c is positioned in the central part of the second metatarsal bone in the width direction (thickness direction).

[0044] The stopper projection 40 is located below the third proximal phalanx, with the corner between the wall surface and the base surface of the stopper projection 40 positioned at the tip of the third proximal phalanx. The stopper projection 50 is located below the second proximal phalanx, with the inclined surface of the stopper projection 50 positioned at the center of the second proximal phalanx.

[0045] The shapes of the heel projection 10, the first central projection 20, the second central projection 30, and the stopper projections 40 and 50 are determined based on the user's arch structure. Specifically, for example, a shoemaker uses a 3D scanner or the like to read the shape of the user's foot in three dimensions and obtain data on the user's foot shape. Based on this data, data on the ideal arch structure for the user is obtained.

[0046] Next, based on the acquired data, the actual arch structure of the user is compared with the ideal arch structure for the user, and the shapes of the heel protrusion 10, first central protrusion 20, second central protrusion 30, and stopper protrusions 40, 50, such as the height of the inclined surface, gradient, inclination direction, and unevenness, are determined so that the user's arch structure can be corrected to the ideal arch structure. Then, based on the determined shape data of the heel protrusion 10, first central protrusion 20, second central protrusion 30, and stopper protrusions 40, 50, the heel protrusion 10, first central protrusion 20, second central protrusion 30, and stopper protrusions 40, 50 are created. This manufactures the sole adjuster 1. Finally, the created heel protrusion 10, first central protrusion 20, second central protrusion 30, and stopper protrusions 40, 50 are fixed to the insole 5, thereby attaching the sole adjuster 1 to the shoe. The top surface of the shoe-shaped adjuster 1 is covered with a material such as vinyl or leather, and the user places their foot on the covering material when wearing the shoe.

[0047] [Usage status of this embodiment] Next, we will describe the state in which the user is wearing pumps to which the shoe sole adjuster 1 of this embodiment has been applied.

[0048] When a user wears pumps to which the sole adjuster 1 of this embodiment is applied, the posterior part of the arch on the inner side of the user's sole comes into contact with the inclined surface of the heel projection 10. At the same time, the cuboid bone portion and the third and fourth metatarsal bone portions on the inner side of the user's sole come into contact with the inclined surfaces 20d and 30d of either the first central projection 20 or the second central projection 30. In addition, the stopper projection 50 comes into contact with the base of the second toe, and the stopper projection 40 comes into contact with the base of the third toe.

[0049] When a user stands while wearing pumps to which the sole adjuster 1 of this embodiment is applied, the user's heel rests on the inclined surface of the heel projection 10, causing the outer part of the user's sole, i.e., the little toe side, to tilt downward relative to an imaginary line passing from the center of the heel through the space between the second toe and the first toe. Furthermore, as the user's sole rests on the inclined surface 20d of the first central projection 20 and the inclined surface 30d of the second central projection 30, the outer side (little toe side) of the user's sole tends to tilt downward, causing the user's sole to contact the area of ​​the insole 5 that is outside the first central projection 20 and the second central projection 30. In addition, the user becomes able to grip the stopper projections 40 and 50 with their third toe and second toe.

[0050] As described above, when a user wears pumps fitted with the shoe sole adjuster 1 of this embodiment and assumes a standing position, the outer side of the user's sole tends to tilt towards the little toe, making it easier to form an arch. This reduces pressure on the ball of the big toe against the sole, thereby reducing the load on the ball of the big toe. Consequently, the occurrence of bunions and other foot problems can be reduced.

[0051] Furthermore, because the wall surface 20c of the first central projection 20 extends approximately perpendicular to the insole 5, the portion of the user's foot medial to the second metatarsal bone tends to separate from the surface of the insole 5. Here, it is conceivable to make the wall surface of the first central projection 20 not perpendicular to the insole 5, but with a gentle slope of, for example, about 30 degrees. However, in this case, the portion of the user's foot where the second metatarsal bone touches the first central projection 20, causing the user to consciously try to bring the portion of the second metatarsal bone into contact with the first central projection 20, which can result in the portion of the user's foot medial to the second metatarsal bone being brought closer to the insole 5. This may cause stress on the ball of the big toe. In contrast, according to this embodiment, because the wall surface 20c of the first central projection 20 extends approximately perpendicular to the insole 5, there is no member that contacts the medial half of the second metatarsal bone and the portion of the first metatarsal bone on the sole of the user's foot. Therefore, the first metatarsal bone of the user is more likely to be lifted away from the insole 5, which reduces the load on the ball of the big toe.

[0052] This allows the user to position their toes so that they grip the stopper protrusions 40 and 50 with their third and second toes, enabling them to point their toes towards the bottom surface. This is expected to facilitate the formation of the arch structure of the user's foot.

[0053] Although embodiments of the present invention have been described above, the embodiments of the present invention are not limited to those described above. For example, according to the embodiments described above, the wall surface of the first central projection 20 extends perpendicular to the insole 5, but if the portion of the user's second metatarsal bone does not easily rest on the first central projection 20, the wall surface 20c of the first central projection 20 may be at a slight angle with respect to the insole 5. Specifically, if the angle is between 60° and 120°, it is possible to reduce the load on the ball of the big toe.

[0054] Furthermore, according to the embodiment described above, the upper edge of the wall surface 30c of the second central projection 30 is positioned in the center of the width direction (thickness direction) of the second metatarsal bone. However, the position of the upper edge of the wall surface 30c may be positioned within a range in which at least the first metatarsal bone on the big toe side does not come into contact with the insole 5, in other words, within the range from the fourth metatarsal bone to the second metatarsal bone. In this case, the position of the upper edge of the wall surface 30c can be set appropriately within the range from the third metatarsal bone to the second metatarsal bone, or from the fourth metatarsal bone to the third metatarsal bone, or from the fifth metatarsal end of the fourth metatarsal bone to the center of the fourth metatarsal bone, etc., as long as it is within the range from the fourth metatarsal bone to the second metatarsal bone. This makes it easier for the area around the first metatarsal bone on the sole of the user's foot to lift away from the surface of the insole 5, thereby reducing the load on the ball of the big toe.

[0055] Furthermore, although the above-described embodiment uses women's pumps as an example, the shoes of the present invention are not limited to women's pumps, but may also be men's leather shoes, or even boots, sandals, or flip-flops. Also, although the above-described embodiment uses women's pumps as an example and divides them into a first central projection 20 and a second central projection 30 because the heel is high, if the shoe does not have a high heel, the first central projection 20 and the second central projection 30 may be connected to form a single central projection. In addition, a covering material such as vinyl or leather is placed on top of the sole adjuster 1 so that the sole adjuster 1 does not come into direct contact with the user's foot.

[0056] Furthermore, the shape and arrangement of the heel projection 10, the first central projection 20, etc., can be appropriately modified according to the arch structure of the actual user.

[0057] Figure 5 is an explanatory diagram showing a modified example of the sole adjuster 1 in one embodiment of the present invention. In the embodiment shown in Figure 5, a heel projection 12 is placed on the insole 5 instead of the heel projection 10 in the embodiments shown in Figures 1 to 4, and a first central projection 22 is placed on the insole 5 instead of the first central projection 20. Note that the configuration and arrangement of the second central projection 30 and stopper projections 40 and 50 in the embodiment shown in Figure 5 are the same as in the embodiment shown in Figure 1, so a detailed explanation is omitted.

[0058] The heel projection 12 has a roughly comb-like shape, resembling a rugby ball divided into quarters along its longitudinal direction, and is slightly shorter in length than the heel projection 10. The heel projection 12 is positioned closer to the arch of the foot in the heel area of ​​the insole 5. The heel projection 12 is fixed by attaching one of its two comb-shaped surfaces to the surface of the insole 5 with adhesive or double-sided adhesive tape, while the other surface extends perpendicularly from the insole 5. The curved surface formed between the two comb-shaped surfaces is an inclined surface that bulges diagonally upward, sloping downward from the upper edge of the other surface of the two comb-shaped surfaces towards the rear at an angle.

[0059] The first central projection 22 has a roughly right-angled triangular base 22a on the toe side, and is a long, roughly triangular pyramidal shape extending from this base 22a toward the heel. In addition to the roughly right-angled triangular base 22a, it has an opposing surface 22b that faces the insole 5, a wall surface 22c that extends perpendicularly upward from one side of the opposing surface 22b, and an inclined surface 22d that extends from the upper end of the wall surface 22c toward the other side of the opposing surface 22b. The opposing surface 22b and the inclined surface 22d are roughly acute triangles, and the wall surface 22c is roughly right triangle. The tip of the roughly triangular pyramidal shape of the first central projection 22 is formed into an arc-shaped curved surface.

[0060] The wall surface 22c extends perpendicularly to the opposing surface 22b and diagonally to the bottom surface 22a. The angle of the wall surface 22c with respect to the bottom surface 22a is smaller than the angle of the wall surface 20c with respect to the bottom surface 20a in the embodiments shown in Figures 1 to 4.

[0061] The first central projection 22 is fixed to the insole 5 in the same way as the first central projection 20 in the embodiments shown in Figures 1 to 4, by attaching the opposing surfaces 22b to the surface of the insole 5 using adhesive or double-sided adhesive tape, with the bottom surfaces of the first central projection 22 facing each other behind the second central projection 30.

[0062] The first central projection 22 is positioned laterally to the heel projection 12, with the outer end of the heel projection 12 and the approximately triangular pyramidal tip of the first central projection 22 adjacent to each other with a slight gap between them.

[0063] When a user wears a shoe fitted with a modified version of the sole adjuster 1 shown in Figure 5, and views the insole 5 from above, as shown in Figure 5, the upper edge of the curved surface formed between the two comb-shaped surfaces at the heel process 12 extends diagonally from the middle of the user's talus toward the calcaneus, curving outward and extending forward toward the cuboid bone.

[0064] Similarly, the upper edge of the wall surface 22c of the first central process 22 extends obliquely from near the joint between the cuboid and the calcaneus, through the lateral cuneiform bone, to the middle of the second metatarsal bone. The lateral edge of the opposing surface 22b extends from near the joint between the cuboid and the calcaneus, through the posterior end of the fourth metatarsal bone, to an intermediate position between the middle of the third metatarsal bone and the fourth metatarsal bone.

[0065] In this modified configuration, the heel projection 12 and the first central projection 22 are positioned along the edge of the arch of the user's foot, so there is no member that contacts the arch area of ​​the user's sole. As a result, the portion of the user's first metatarsal bone tends to be lifted away from the insole 5, making it possible to reduce the load on the ball of the big toe.

[0066] Furthermore, because the calcaneal process 12 extends diagonally from the lower center of the user's talus toward the cuboid bone, the inclined surface of the calcaneal process 12 makes it difficult for the user's calcaneus to pronate and facilitates the formation of an arch structure. This makes it possible to further reduce the load on the ball of the big toe.

[0067] Furthermore, the present invention is not limited to the embodiments described above, and any modifications, improvements, etc., that can achieve the objectives of the present invention are included within the scope of the present invention. [Explanation of symbols]

[0068] 1 Shoe sole adjuster 5. Insole 10, 12 heel process 20, 22 1st central process 20a, 22a bottom surface 20b, 22b Opposite surface 20c, 22c wall 20d, 22d sloped surface 30 Second central process 30a Bottom 30b Opposite side 30c wall 30d slope 40, 50 Stopper protrusions

Claims

1. A shoe sole adjuster that is placed in the sole of a shoe and corrects the arch structure of the user's foot, The shoe has an opposing surface facing the sole, a wall surface rising above the opposing surface, and an inclined surface facing the user's cuboid bone and a portion of the lateral cuneiform bone and at least the user's third and fourth metatarsals, and sloping from the upper end of the wall surface toward the little toe side of the opposing surface, and is provided with a central projection protruding from the surface of the sole, The toe-side end of the aforementioned wall surface is characterized in that it faces either the fourth metatarsal bone or the second metatarsal bone.

2. The sole adjuster according to claim 1, characterized in that the central projection includes a first central projection extending from a portion of the user's cuboid bone through a portion of the lateral cuneiform bone to the central portion of the user's third and fourth metatarsals, and a second central projection positioned at a predetermined distance from the first central projection and extending from the second metatarsal bone to the tip of at least one of the fourth metatarsals.

3. The sole of the shoe further comprises a heel projection located on the heel side and on the inner edge, which protrudes from the surface of the sole, The shoe sole adjuster according to claim 2, characterized in that the heel projection is located posterior to the arch of the user's foot, below the tip of the talus, positioned on the medial side of the tip of the calcaneus, and has an inclined surface that slopes toward the little toe.

4. The sole adjuster according to claim 3, further comprising stopper projections positioned in the center of the user's second and third proximal phalanges and protruding from the surface of the sole so as to be gripped by the user's second and third toes.

5. A shoe characterized by comprising the sole adjuster described in claim 1.

Images