Foot support structure, sandals and insoles equipped with a foot support structure

Abstract

This invention provides a foot support structure and sandals and insoles equipped with such a structure, designed to improve flat feet and floating toes by strengthening the muscles and motor nerves necessary for walking, as well as to prevent and improve bunions, hammertoes, ingrown toenails, etc. [Solution] In a foot sole placement structure 33 comprising a main body placement section 35 on which the part of the sole of the foot other than the toes is placed and a toe placement section 37 on which the toes are placed, the toe placement section 37 is formed to be lower in height than the main body placement section 35, and further, the toe placement section 37 has a first toe placement section 37A on which the inner first toe is placed, a fifth toe placement section 37E on which the outer fifth toe is placed, and intermediate toe placement sections 37B (C, D) on which the intermediate second, third, and fourth toes are placed, and the height of the first toe placement section 37A is set to be lower in height than the height of the intermediate toe placement sections 37B (C, D).

Description

Technical Field

[0001] The present invention relates to a placement structure on the sole of the foot that can expand the range of movement of the toes, efficiently apply the body weight to the toes to obtain a load, improve the gripping force of the toes, and exercise the muscles and motor nerves for walking, a straw sandal provided with this placement structure on the sole of the foot, and an insole.

Background Art

[0002] In modern shoes, a structure that supports the arch on the sole of the foot from the heel to the toes of the foot is adopted. It has strong torsional rigidity, and some products have springs and good cushioning properties, so it is easy to walk and not easily fatigued. As a result, most of the impact generated during walking or running is absorbed by the shoes, and little stimulation is applied to the posterior tibial muscle, which is the muscle for walking (hardly used). The posterior tibial muscle becomes thin, and due to the decline of the motor nerves for walking, the arch of the foot drops, leading to flat feet.

[0003] Also, in modern shoes, a structure is adopted that generates a large frictional force with the ground through an uneven structure or the like that improves the material of the shoe sole and the grip, making it difficult to slip. Furthermore, due to the excellent torsional rigidity and spring (cushioning property) described above, the structure is such that excessive flexion and extension are not applied to the toes. As a result, the function of gripping the ground with the toes during walking or running to prevent slipping and obtaining the propulsive force at the time of standing as a reaction to the movement by the gripping is no longer used. As a result, the plantar muscle group also becomes thin, the motor nerves for walking also decline, and the gripping force of the toes decreases, leading to floating toes.

[0004] Against this backdrop, sandals designed to allow the toes to exercise comfortably have also been proposed (see Patent Document 1, etc.). The sandals described in Patent Document 1 have a step that lowers the contact surface of the toes of the second, third, fourth, and fifth toes (excluding the first toe) than the contact surface of the sole, and also have protrusions on the surfaces of the rear of these four toes that contact the sole. According to the sandals described in Patent Document 1, with each step the bases of the second, third, fourth, and fifth toes are lifted upward, and the toes repeatedly grip the edge, a downward motion that is intended to strengthen the toe muscles. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Utility Model Registration No. 3178811 (Gazette) [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, the sandals disclosed in Patent Document 1 do not have a step on the surface that the first toe contacts. Therefore, although the range of motion of the second, third, fourth, and fifth toes in the vertical direction is increased, the movement of the first toe, which has the largest range of motion, is restricted. For this reason, the effect of improving flat feet and floating toes is limited, and furthermore, it cannot be expected to have any effect in preventing or improving bunions or ingrown toenails, which are said to be partly caused by restricted movement of the first toe.

[0007] The present invention has been made in view of the above circumstances, and aims to provide a foot support structure, sandals equipped with a foot support structure, and insoles that are designed to improve flat feet and floating toes by training the muscles and motor nerves for walking, and to prevent and improve bunions, hammertoes, ingrown toenails, etc. [Means for solving the problem]

[0008] The present invention, which solves the above problems, is a foot support structure comprising a main support portion on which the part of the sole of the foot other than the toes is supported, and a toe support portion on which the toes are supported, The toe resting portion is formed to be lower in height than the main body resting portion. Furthermore, the toe rest section has a first toe rest section on the inner first toe, a fifth toe rest section on the outer fifth toe, and intermediate toe rest sections on the intermediate second, third, and fourth toes. The first toe rest is characterized in that its height is set to be lower than the height of the intermediate toe rest.

[0009] Here, the part of the sole of the foot excluding the toes refers to the portion of the sole of the foot from the heel to the ball of the big toe or the ball of the little toe. Furthermore, the part of the toe that is placed on the toe rest is specifically the bottom surface (ball) of the distal phalanx of the toe.

[0010] According to the foot support structure of the present invention, the height of the toe support portion is formed to be lower than the height of the main body support portion, thereby expanding the range of motion of the toes and forcing the toes to flex significantly when the foot makes contact with the ground and then stands up during walking and running. Specifically, pronation and supination of the foot, flexion and extension of the Chopart and Lisfranc joints, and flexion and extension of the first, second, third, fourth, and fifth toes are forced. Furthermore, when standing up, the body weight is efficiently applied to the toes, generating a load sufficient for muscle strengthening.

[0011] In other words, when the toes grip the ground during foot contact, the momentum from that gripping motion is semi-passively used as a reaction during the push-off motion, increasing the force of the push-off. This forcibly stimulates the posterior tibialis muscle, which forms the arch of the foot, causing muscle hypertrophy and nerve facilitation. As a result, the arch of the foot is formed, and flat feet are improved.

[0012] Furthermore, during walking and running, the toes are semi-passively forced to flex significantly when the foot makes contact with the ground and then stands up, and body weight is efficiently distributed to the toes. In other words, the plantar muscles are forcibly stimulated, causing muscle hypertrophy and motor nerve facilitation. This improves floating toes.

[0013] In particular, because the height of the first toe rest is formed to be lower than the height of the intermediate toe rest, the range of motion of the first toe, which has a large range of motion, is especially expanded, and the weight of the foot is especially concentrated on the first toe, resulting in a high-intensity exercise load. As a result, the vertical movement of the first toe gripping the ground is increased, and the first toe rest also promotes foot pronation and supination. This strengthens the posterior tibialis muscle, plantar muscles, and motor nerves, making it possible to more effectively improve flat feet and floating toes. Furthermore, since the pressure on the first toe is also increased, it can be expected to have a preventive and corrective effect on bunions and ingrown toenails.

[0014] Furthermore, in the foot support structure of the present invention, it is preferable that the height of the fifth toe support portion is set to be lower than the height of the intermediate toe support portion.

[0015] This expands the range of motion of the fifth toe, ensuring sufficient range of motion for the fifth toe, and particularly promotes foot supination. As a result, the posterior tibialis muscle, plantar muscles, and motor nerves are strengthened, making it possible to more effectively improve conditions such as floating toes, flat feet, and bunions.

[0016] Furthermore, in the foot support structure of the present invention, the posterior portion having the main body support portion and the anterior portion having the toe support portion are separated by an anterior portion boundary line that curves in the width direction and is provided at a predetermined distance in front of the line connecting the ends of the metatarsal bones. The medial anterior portion having the first toe rest and the intermediate anterior portion having the intermediate toe rest are separated by an inner boundary line of the anterior portion that extends longitudinally from the midpoint between the first and second toes on the anterior portion boundary line to the anterior end of the anterior portion. The outer forefoot portion having the fifth toe rest and the intermediate forefoot portion may be separated by an outer forefoot boundary line that extends longitudinally from the midpoint between the fourth toe and the fifth toe on the forefoot boundary line to the anterior end of the forefoot portion.

[0017] Furthermore, in the foot support structure of the present invention, the intermediate anterior portion having the intermediate toe support portion is formed by a flat surface that is lower in height than the posterior portion having the main body support portion. The inner forefoot portion having the first toe rest is formed by a downward-sloping surface that gradually decreases in height, connected to the inner side of the intermediate forefoot portion. The outer forefoot portion having the fifth toe rest may be formed by a downward-sloping surface that is continuous with the outer side of the intermediate forefoot portion and gradually decreases in height.

[0018] Adopting this configuration will allow for smoother pronation and supination of the foot, in particular.

[0019] Furthermore, the bottom surfaces of the first toe resting portion, the fifth toe resting portion, and the intermediate toe resting portion, on which the corresponding first toe, fifth toe, and second toe, third toe, and fourth toe are resting, can also be formed by recesses of a predetermined height.

[0020] In this case, similar to the case where flat and inclined surfaces are used as described above, it is possible to more effectively improve flat feet and floating toes by strengthening the muscles and motor nerves necessary for walking, such as by increasing the range of vertical movement of the entire toe.

[0021] Furthermore, the position of the anterior boundary line between the posterior portion having the main body mounting portion and the anterior portion having the toe mounting portion may be set at a position 3 to 12 mm in front of the line connecting the ends of the metatarsal bones.

[0022] In this way, the vertical movement of the toes becomes smoother, allowing for freer movement of the toes. Furthermore, it becomes possible to select the optimal position within the above-mentioned range of dimensions, depending on the type and size of the footwear being used.

[0023] Furthermore, it is possible to set the height of the first toe placement part and the height of the fifth toe placement part to be 6 to 12 mm lower than the height of the main body placement part.

[0024] In this case, it is possible to sufficiently maintain the range in which the first toe and the fifth toe can move and increase the gripping force by both toes. And, depending on differences in the type, size, etc. of footwear to be applied, it becomes possible to select an optimal height within the range of the above dimensions.

[0025] The straw sandal in the present invention that solves the above problems is a straw sandal including a top surface portion placed on the sole of the foot, a bottom surface portion without teeth placed on the ground, and a nose strap attached so that a forecourt comes between the first toe and the second toe. It is characterized in that the placement structure of the sole of the foot according to claim 1 or 2 is applied to the top surface portion.

[0026] According to the straw sandal of the present invention, it becomes possible to provide a straw sandal that can enjoy the functions and effects of the placement structure of the sole of the foot described above.

[0027] The insole in the present invention that solves the above problems is an insole including a top surface portion placed on the sole of the foot and a bottom surface portion placed on the inner surface of the shoe sole. It is characterized in that the placement structure of the sole of the foot according to claim 1 or 2 is applied to the top surface portion.

[0028] In this case, it becomes possible to provide an insole that can enjoy the functions and effects of the placement structure of the sole of the foot described above.

Effects of the Invention

[0029] According to the present invention, it is possible to provide a placement structure of the sole of the foot, a straw sandal, and an insole having a placement structure of the sole of the foot, which are devised to exercise the muscles and motor nerves for walking, improve flat feet and floating toes, and prevent and improve hallux valgus, adducted little toes, curled nails, etc.

Brief Description of the Drawings

[0030] [Figure 1] This diagram shows the structure of the foot, specifically a side view illustrating the muscles of the foot. [Figure 2] This is a diagram illustrating the structure of the foot, specifically a plan view showing the bones of the foot. [Figure 3] This figure shows a first embodiment of the present invention, and is a perspective view showing a pair of sandals. [Figure 4] This figure shows a front view of a sandal, illustrating the first embodiment of the present invention. [Figure 5] This figure shows a first embodiment of the present invention, and is a rear view of a sandal. [Figure 6] This figure shows a first embodiment of the present invention, and is a right side view of a sandal. [Figure 7] This figure shows a first embodiment of the present invention, and is a left side view showing a sandal. [Figure 8] This figure shows a plan view of a sandal, illustrating the first embodiment of the present invention. [Figure 9] This figure shows a bottom view of a sandal, illustrating a first embodiment of the present invention. [Figure 10] This figure shows a first embodiment of the present invention, and is a cross-sectional view taken along line A-A in Figure 4. [Figure 11] This figure shows a first embodiment of the present invention, specifically a cross-sectional view taken along line B-B in Figure 8. [Figure 12] This figure shows a second embodiment of the present invention, and is a perspective view showing the insole and shoe. [Figure 13] This figure shows another embodiment of the present invention, and is a plan view showing an insole. [Figure 14] Figure 13 shows another embodiment of the present invention, specifically a cross-sectional view taken along line C-C in Figure 13. [Modes for carrying out the invention]

[0031] The following will specifically describe the foot support structure, sandals equipped with the foot support structure, and insoles of the present invention, using two embodiments, the first embodiment shown in Figures 3 to 11 and the second embodiment shown in Figure 12, as examples.

[0032] First, we will briefly explain the structure of the muscles and bones of the foot using Figures 1 and 2. Figure 1 is a lateral view showing the muscles of the foot, and Figure 2 is a plan view showing the bones of the foot.

[0033] As shown in Figure 1, the muscles of the foot 1 include the posterior tibialis muscle 5, which extends upward +Z from the ankle, passing behind the tibia 3, and the plantar muscles 13, which are located below the navicular bone 11, forming a longitudinal Y direction from the heel 7 to the toes 9. The posterior tibialis muscle 5 is the muscle that forms the arch of the foot, shown as A in the figure. When the toes 9, which are in contact with and gripping the ground G during walking or running, are in stance, the muscle semi-passively uses the gripping force to push off the ground G, increasing the force with which the toes push off the ground G and contributing to the formation of the arch A. Therefore, it is believed that a decrease in the strength of the posterior tibialis muscle 5 can lead to flat feet, where the sole of the foot becomes flat.

[0034] The plantar muscles 13 are the muscles that allow the toes 9 to grip the ground G, and it is believed that if the toes 9 are completely immobile or their range of motion is narrowed, it can lead to floating toes. A common exercise described in general medical textbooks is called the "towel gather," in which a person places a towel on the floor, stands on it, and tries to grasp the towel with their toes and pull it towards them. While this "towel gather" is an exercise that strengthens the plantar muscles 13, it has very little effect on strengthening the muscles because no weight is placed on the toes 9. For this reason, the foot support structure 33 of the present invention, which will be described later, is distinct from the "towel gather."

[0035] As shown in Figure 2, the bones of foot 1 include phalanges 15 located anterior to the longitudinal direction Y +Y, metatarsals 17 located posterior to the longitudinal direction Y -Y, and tarsal bones 19 located posterior to the longitudinal direction Y. The boundary between the phalanges 15 and the metatarsals 17 is line B, which connects the heads of the five metatarsals 17, and the toes 9 can move in the vertical direction Z from this line.

[0036] Next, the configuration of the sandal according to the first embodiment of the present invention and the foot support structure of the present invention applied to the top surface of the sandal will be described in detail based on Figures 3 to 11. Figure 3 is a perspective view showing the sandal according to the first embodiment of the present invention, Figure 4 is a front view, Figure 5 is a rear view, Figure 6 is a right side view, Figure 7 is a left side view, Figure 8 is a top view, and Figure 9 is a bottom view. Also, Figure 10 is a cross-sectional view of the sandal shown in Figure 4 along line A-A, and Figure 11 is a cross-sectional view of the sandal shown in Figure 8 along line B-B.

[0037] The sandal 21 according to the first embodiment of the present invention improves flat feet and floating toes of the foot 1. Furthermore, it is expected to be effective in preventing and improving bunions, hammertoes, and ingrown toenails. This sandal 21 is footwear comprising a top surface 25 on which the sole of the foot 2 (see Figure 1) rests, a toothless bottom surface 27 that contacts the ground G, and a thong 31 attached so that the front thong 29 is between the first toe 9A and the second toe 9B, as shown in Figure 8.

[0038] Furthermore, as a feature of the first embodiment of the present invention, the foot sole placement structure 33 of the present invention, which will be described in detail below, is applied to the top surface portion 25.

[0039] The foot support structure 33 of the present invention comprises a main support section 35 on which the part of the sole of the foot 2 other than the toes is supported, and a toe support section 37 on which the toes 9 (specifically the distal phalangeal sole (ball)) are supported. As shown in Figure 10, the height H of the toe support section 37 is set to be lower than the height H0 of the main support section 35.

[0040] As shown in Figures 3 and 8, the toe rest 37 has a first toe rest 37A on the medial +X side where the first toe 9A is rested, a fifth toe rest 37E on the lateral -X side where the fifth toe 9E is rested, and intermediate toe rest 37B(C, D) on the intermediate second toe 9B, third toe 9C, and fourth toe 9D. As shown in Figure 11, in this embodiment, the height H1 of the first toe rest 37A and the height H5 of the fifth toe rest 37E are set to be lower than the height H2(3, 4) of the intermediate toe rest 37B(C, D).

[0041] Furthermore, as shown in Figure 8, in this embodiment, the posterior part 39 having the main body mounting part 35 and the anterior part 41 having the toe mounting part 37 are separated by an anterior part boundary line 43 that curves in the width direction X and is located at a predetermined distance C in front of +Y of the line B connecting the ends of the metatarsal bones 17. In this embodiment, this distance C is set in the range of 3 to 12 mm and is adjusted to the optimal position within the above dimension range depending on the size, shape, structure, etc. of the sandal 21 to which it is applied.

[0042] Furthermore, the medial anterior portion 41A (vertical hatching in Figure 8) having the first toe resting portion 37A and the intermediate anterior portion 41B (C, D) (grid-like hatching in Figure 8) having the intermediate toe resting portions 37B (C, D) are separated by an inner anterior portion boundary line 45 that extends in the vertical direction Y from the midpoint D between the first toe 9A and the second toe 9B on the anterior portion boundary line 43 to the anterior end of the anterior portion 41.

[0043] Furthermore, the outer anterior portion 41E (hatched in the longitudinal direction in Figure 8) having a fifth toe rest 37E and the intermediate anterior portion 41B(C, D) having intermediate toe rest 37B(C, D) are separated by an outer anterior portion boundary line 47 that extends in the longitudinal direction Y from the midpoint E between the fourth toe 9D and the fifth toe 9E on the anterior portion boundary line 43 to the anterior end of the anterior portion 41.

[0044] As shown in Figure 11, in this embodiment, the intermediate forefoot portion 41B(C, D) having the intermediate toe resting portion 37B(C, D) is formed by a flat surface with a height 3 to 6 mm lower than the height H0 of the posterior foot resting portion 39 having the main body resting portion 35. Furthermore, the medial forefoot portion 41A having the first toe resting portion 37A is formed by a downward sloping surface that gradually decreases in height, connected to the medial +X of the intermediate forefoot portion 41B(C, D). In addition, the lateral forefoot portion 41E having the fifth toe resting portion 37E is formed by a downward sloping surface that gradually decreases in height, connected to the medial -X of the intermediate forefoot portion 41B(C, D).

[0045] Furthermore, in this embodiment, the height H1 of the first toe resting portion 37A and the height H5 of the fifth toe resting portion 37E on the inclined surface are set to a height 6 to 12 mm lower than the height H0 of the main body resting portion 35. The heights H1 of the first toe resting portion 37A and H5 of the fifth toe resting portion 37E are adjusted to the optimal height within the above dimensions depending on the size, shape, structure, etc. of the sandal 21 to which they are applied. In addition, in this embodiment, the heights H1 of the first toe resting portion 37A and H5 of the fifth toe resting portion 37E are set to approximately the same height, but they may be set to different heights (for example, the height H1 of the first toe resting portion 37A may be lower than the height H5 of the fifth toe resting portion 37E). Furthermore, both or either of the inner front top portion 41A and the outer front top portion 41E may be formed as an arc-shaped inclined surface.

[0046] According to the sandals 21 and foot support structure 33 of the present invention, the height of the toe support portion 37 is formed to be lower than the height of the main support portion 35, thereby expanding the range of motion of the toes 9, and forcing the toes 9 to flex significantly when the foot makes contact with the ground and then stands up during walking and running. Specifically, pronation and supination of the foot, flexion and extension of the Chopart and Lisfranc joints, and flexion and extension of the toes 9 are forced. In addition, when standing up, the body weight is efficiently applied to the toes 9, generating a load sufficient for muscle strengthening.

[0047] In other words, when the toes 9 grip the ground during foot contact, they semi-passively utilize the gripping force as a reaction during the push-off motion, increasing the force of the push-off. This forcibly stimulates the posterior tibialis muscle 5, which forms the arch A of the foot 1, causing muscle hypertrophy and nerve facilitation. As a result, the arch A of the foot 1 is formed, and flat feet are improved.

[0048] Furthermore, during walking and running, when the foot makes contact with the ground and then stands up, the toes 9 are semi-passively forced to flex significantly, and body weight is efficiently distributed to the toes 9. In other words, the plantar muscles 13 are forcibly stimulated, causing muscle hypertrophy and motor nerve facilitation. This improves floating toes.

[0049] In particular, because the height of the first toe support portion 37A is lower than the height of the intermediate toe support portions 37B(C, D), the range of motion of the first toe 9A, which has a large range of motion, is especially expanded. As a result, the vertical movement of the first toe 9A in gripping the ground is increased, and the first toe support portion 37A also promotes foot pronation and supination. This strengthens the posterior tibialis muscle 5, plantar muscles 13, and motor nerves, making it possible to more effectively improve flat feet and floating toes. Furthermore, since the pressure on the first toe 9A is also increased, it can be expected to have a preventive and corrective effect on bunions, hammertoes, and ingrown toenails.

[0050] Furthermore, in this embodiment, since the height of the fifth toe resting portion 37E is set lower than the height of the intermediate toe resting portions 37B(C, D), the range of motion of the fifth toe 9E is also expanded, ensuring sufficient range of motion for the fifth toe 9E, and particularly promoting supination of the foot. As a result, the posterior tibialis muscle 5, plantar muscles 13, and motor nerves are strengthened, making it possible to more effectively improve conditions such as floating toes, flat feet, and bunions.

[0051] Furthermore, in this embodiment, the medial anterior portion 41A is formed by a downward-sloping surface that gradually decreases in height, connected to the inside of the intermediate anterior portion 41B(C, D), and the lateral anterior portion 41E is formed by a downward-sloping surface that gradually decreases in height, connected to the outside of the intermediate anterior portion 41B(C, D). This allows for smoother pronation and supination movements of the foot, in particular.

[0052] Next, using Figure 12, we will briefly explain the configuration of the insole according to the second embodiment of the present invention and the foot support structure of the present invention applied to the top surface of the insole, focusing on the differences from the first embodiment. Figure 12 is a perspective view showing the insole and shoe according to the second embodiment of the present invention.

[0053] The insole 51 according to the second embodiment of the present invention, shown in Figure 12, improves flat feet and floating toes of the foot 1, similar to the sandals 21 according to the first embodiment described above, and is an accessory component of the shoe 53 used by placing it on the inner surface 54a of the sole 54 of the shoe 53. Furthermore, the insole 51 is also expected to have the effect of preventing and improving the occurrence of bunions, hammertoes, and ingrown toenails.

[0054] And, as in the first embodiment, the sole support structure 33 of the present invention described above is applied to the top surface portion 25 that rests on the sole of the foot 2. Therefore, the explanation of the sole support structure 33 of the present invention is omitted here.

[0055] By using the insole 51 according to the second embodiment, the effects and benefits of the foot support structure 33 of the present invention described above will be realized, strengthening the muscles and motor nerves for walking, improving flat feet and floating toes, and preventing and improving the occurrence of bunions, hammertoes, and ingrown toenails.

[0056] The foot support structure 33 of the present invention, the sandals 21 equipped with the foot support structure 33, and the insole 51 are not limited to the configurations described in the above-mentioned first and second embodiments, and various modifications can be made within the scope of the claims. For example, in the above-mentioned first and second embodiments, an example was given in which the height of the fifth toe support portion 37E is set lower than the height of the intermediate toe support portions 37B(C, D), but the height of the fifth toe support portion 37E may be set to be approximately the same as the height of the intermediate toe support portions 37B(C, D). Furthermore, the foot support structure 33 of the present invention is not limited to sandals 21, but may also be applied to the top surface 25 of other footwear such as slippers and sandals, and the insole 51 may be an insole that is pre-installed in the shoe 53, or a separate insole provided separately for replacement.

[0057] Furthermore, the intermediate toe resting portion 37B(C, D) is not limited to being formed by a flat surface; it may also be formed by a downward-sloping inclined surface from the inner boundary line 45 of the anterior top portion to the outer boundary line 47 of the anterior top portion, or by a downward-sloping inclined surface from the anterior top portion boundary line 43 towards the toe. Alternatively, a stepped portion can be used instead of an inclined surface.

[0058] In addition, as shown in Figures 13 and 14, the first toe resting portion 37A, the fifth toe resting portion 37E, and the intermediate toe resting portions 37B(C, D) can also have their bottom surfaces, on which the corresponding first toe 9A, fifth toe 9E, second toe 9B, third toe 9C, and fourth toe 9D are rested, formed by recesses 55 of a predetermined height H. [Explanation of Symbols]

[0059] 1 pair 2. Soles of the feet 5. Posterior tibialis muscle 9 Toes 13. Plantar muscles 25 Top section 27 Bottom part 33. Foot support structure 35 Main unit mounting section 37 Toe support area 37A 1st toe resting part 37B(C,D) Middle toe resting part 37E Fifth toe support section 39 Acquired part 41 Anterior part 41A Medial anterior part 41B(C,D) Intermediate anterior part 41E Lateral anterior part 43 Frontal boundary line 45 Medial border of anterior temporum 47 Frontal lateral border 51 Insoles 55 Recessed area Z vertical direction X Width direction Y (vertical direction) A Arch G ground

Claims

1. In a foot support structure comprising a main support section on which the part of the sole of the foot other than the toes is placed, and a toe support section on which the toes are placed, The toe rest portion is formed to be lower in height than the main body rest portion. Furthermore, the toe rest section has a first toe rest section on the inner first toe, a fifth toe rest section on the outer fifth toe, and intermediate toe rest sections on the intermediate second, third, and fourth toes. The foot support structure is characterized in that the height of the first toe support portion is set to be lower than the height of the intermediate toe support portion.

2. The foot support structure according to claim 1, characterized in that the height of the fifth toe support portion is set to be lower than the height of the intermediate toe support portion.

3. The posterior portion having the main body mounting portion and the anterior portion having the toe mounting portion are separated by an anterior portion boundary line that curves in the width direction and is located at a predetermined distance anterior to the line connecting the ends of the metatarsal bones. The medial anterior portion having the first toe rest and the intermediate anterior portion having the intermediate toe rest are separated by an internal boundary line of the anterior portion that extends longitudinally from the midpoint between the first toe and the second toe on the anterior portion boundary line to the anterior end of the anterior portion. The foot support structure according to claim 1 or 2, characterized in that the outer forefoot portion having the fifth toe support portion and the intermediate forefoot portion are separated by an outer boundary line of the forefoot portion that extends longitudinally from the midpoint between the fourth toe and the fifth toe on the boundary line of the forefoot portion to the anterior end of the forefoot portion.

4. The intermediate anterior portion having the intermediate toe rest is formed by a flat surface that is lower in height than the posterior portion having the main body rest. The inner forefoot portion having the first toe rest is formed by a downward-sloping surface that gradually decreases in height, connected to the inner side of the intermediate forefoot portion. The foot support structure according to claim 1, characterized in that the outer forefoot portion having the fifth toe support portion is formed by a downward sloping surface that is connected to the outer side of the intermediate forefoot portion and gradually decreases in height.

5. A sandal comprising a top surface that rests on the sole of the foot, a toothless bottom surface that rests on the ground, and a thong attached so that the front strap is between the first and second toes, A sandal characterized in that the foot sole placement structure described in claim 1 or 2 is applied to the top surface.

6. An insole comprising a top surface that rests on the sole of the foot and a bottom surface that rests on the inner surface of the sole of the shoe, An insole characterized by applying the foot sole support structure described in claim 1 or 2 to the top surface.

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