JP7350346B2 - footwear - Google Patents

Description

The present invention relates to footwear such as sandals.

BACKGROUND ART Conventionally, footwear such as sandals and slippers are known that include a sole body on which the foot is placed and a string or belt provided to prevent the sole body from separating from the foot (for example, see Patent Document 1).
This type of footwear has an open structure that is easy to wear because the toes and heels are not covered, and is often used as both indoor and outdoor shoes.

Patent application No. 2017-218769

Conventional sole bodies are made of rubber, resin, leather, etc., and have a flat shape. Therefore, it is not possible to maintain the arch of the sole of the foot in a natural shape to support the foot in a well-balanced manner, and this poses a problem in that walking for a long time tends to cause fatigue.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide footwear that is less tiring even when walking for a long time, ensures stability and maneuverability during walking, and facilitates obtaining exercise effects.

The footwear of the present invention includes a sole body on which the foot is placed, and a string or belt provided to prevent the sole body from separating from the foot, and the sole body is connected to the inner longitudinal arch and the outer longitudinal arch of the foot. and a calcaneus front support convex part that protrudes from the surface of the sole body and supports the calcaneal tubercle of the foot to stabilize the calcaneus in order to maintain the transverse arch; a front side toe ball support part that supports the big toe ball and the little toe ball; a thin front part formed in front of the front side toe ball support part; The sole includes a back side toe ball support part that supports the toe ball and the lesser toe ball and forms a gap between the front part and the ground contact surface of the sole body.

According to the present invention, the front side toe ball support part protrudes from both the front surface and the back surface of the sole body while maintaining the medial longitudinal arch, lateral longitudinal arch, and transverse arch of the foot. And the back side toe ball support part supports the ball of the big toe and the ball of the lesser foot, so the foot is placed in front of the first to fifth proximal phalanges of the foot while maintaining the arch condition of the foot. The fingers are now unrestrained. In addition, the back side toe ball support part protrudes from the back side of the sole body, supports the ball of the big toe and the ball of the lesser toe, and forms a gap between the front part and the contact surface of the sole body. When walking, the toes of the feet become more free, making it possible to walk by grasping the ground with the toes.
Therefore, while maintaining the arch of the sole of the foot and ensuring the stability of the body, it is possible to make it easier to grip the ground with the toes, and to further enhance the effect of exercise. Also, you will not get tired even if you walk for a long time.

According to the present invention, while maintaining the shape of the arch of the sole of the foot and ensuring stability and mobility of the body, it is possible to make it easier to perform the motion of grasping the ground with the toes, and to enhance the effect of exercise. Even if you walk for a long time, you won't get tired.

FIG. 1 is a plan view showing footwear according to an embodiment of the present invention. It is a bottom view of the same. 3 is a sectional view taken along line III-III in FIG. 2. FIG. (A) is a sectional view taken along the line AA in FIG. 2, (B) is a sectional view taken along the line BB in FIG. 2, and (C) is a sectional view taken along the line CC in FIG. It is an explanatory view of the arch of the sole of the foot. FIG. 3 is a vertical cross-sectional view showing the relationship between the sandal and the foot.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a sandal with a thong (footwear) 1 according to the present embodiment.
The sandal 1 includes a sole body 3 on which the foot is placed, a string 5 provided to prevent the sole body 3 from separating from the foot, and a thong 7.
The sole main body 3 and the string 5 are integrally formed and made of resin having a predetermined hardness, and the sole main body 3 and the string 5 are integrally connected by a thong 7. Although not shown in the drawings, the present invention can also be applied to footwear such as so-called hook-type sandals and slippers, which do not have a thong 7 and are composed of a sole body and a band.

FIG. 2 is a bottom view showing the sole body 3 on which the foot skeleton is superimposed. Note that this drawing is viewed from below and some of the bones are hidden because they overlap. The plan view of the foot seen from the front is different from the bottom view of FIG. 2 in how the bones overlap.

As shown in FIG. 2, the skeletal structure 10 of the foot includes a calcaneus 12, a talus 14, a navicular bone 16, a cuboid bone 18, first to third cuneiform bones 20, 22, 24, and first to fifth metatarsals. Bones 26, 28, 30, 32, 34, 1st to 5th proximal phalanx 36, 38, 40, 42, 44, 2nd to 5th middle phalanx 46, 48, 50, 52, 1st to 5th It is composed of distal phalanges 54, 56, 58, 60, and 62. The front ends of the first to fifth metatarsal bones 26, 28, 30, 32, and 34 are the first to fifth metatarsal heads 26A (also referred to as the ball of the foot 26A), 28A, 30A, 32A, 34A ( It is also called the lesser toe ball 34A). The stepped portion located at the front of the calcaneus 12 is the anterior part of the calcaneus (also referred to as the calcaneus tubercle) 12A. In addition, in FIG. 2, only the portion of the navicular bone 16 that is hidden due to the overlapping of the bones is indicated by a broken line.

In this configuration, as shown in FIGS. 1 and 2, a cuboidal bone supporting convex part 80 and a calcaneal anterior part supporting convex part 90 are formed on the surface (upper surface) 3A of the sole main body 3. The cuboidal bone support convex portion 80 and the anterior calcaneus support convex portion 90 constitute the convex portion 2 .
The cuboidal bone supporting convex portion 80 is provided at a portion corresponding to the cuboid bone 18, and the anterior calcaneus supporting convex portion 90 is provided at a portion corresponding to the calcaneal tubercle 12A. The cuboidal bone support projection 80 and the anterior calcaneus support projection 90 are solidly formed.

The anterior calcaneus support projection 90 is provided on the cuboid support projection 80, and the surface of the anterior calcaneus support projection 90 overlaps the surface of the cuboid support projection 80, forming one projection. It forms part 2. The cuboidal bone support projection 80 and the anterior calcaneus support projection 90 may be integral with each other or may be separate bodies. In FIG. 2 , the anterior calcaneus support projection 90 is schematically illustrated along with contour lines indicating the height of the anterior calcaneus support projection 90 .

The surface 3A of the sole body 3 further includes a surface side that supports the first metatarsal head (ball of the big toe) 26A and the second to fifth metatarsal heads (ball of the lesser foot) 28A to 34A. A toe ball support portion (hereinafter referred to as a surface side protrusion) 100 is formed. As shown in FIG. 3, the surface side protrusion 100 bulges upward from the surface 3A of the sole body 3. The front edge of the surface side protrusion 100 extends on a line connecting the first proximal phalanx 36 to the fifth proximal phalanx 44 when viewed from the bottom.
A front portion 110 is formed in front of the surface side protrusion 100, and the thickness of the front portion 110 is the thinnest among the thicknesses of the sole body 3.

The back surface (lower surface) 3B of the sole body 3 supports the first metatarsal head (ball of the big toe) 26A and the second to fifth metatarsal heads (ball of the lesser foot) 28A to 34A of the foot. A back side toe ball support part (hereinafter referred to as a back side protrusion) 200 is formed. As shown in FIG. 3, the back surface protrusion 200 bulges downward from the back surface 3B of the sole body 3, and forms a gap 111 between the front part 110 of the sole body 3 and the contact surface 112 of the sole body 3. are doing. The front edge of the back side protrusion 200 extends on a line connecting the first proximal phalanx 36 to the fifth proximal phalanx 44 when viewed from the bottom.
A front portion 110 is located in front of the back side protrusion 200, and the thickness of the front portion 110 is formed to be the thinnest among the thicknesses of the sole body 3.

In this embodiment, as shown in FIG. 3, the outer shape X1 of the front side protrusion 100 is larger than the outer shape X2 of the back side protrusion 200 in the length direction of the sole main body 3. In this embodiment, the front side protrusions 100 are formed to protrude 2 to 5 mm each from the back side protrusions 200 in the longitudinal direction of the sole body 3, and the outer shape X1 is 4 to 10 mm longer than the outer shape X2. Largely formed. In the width direction of the sole body 3, as shown in FIG. 4(A), the outer shape X3 of the front side protrusion 100 and the outer diameter X4 of the back side protrusion 200 are approximately equal, or the back side protrusion 200 is formed to be slightly smaller than the outer shape X3 of the front side protrusion 100.

The protrusion height of the front side protrusion 100 from the front surface 3A and the protrusion height of the back side protrusion 200 from the back side 3B are approximately equal, and both the front side protrusion 100 and the back side protrusion 200 are flat convex. It has a partial shape. As shown in FIG. 2, the surface protrusion 100 includes a hallux ball part 103 that supports the ball of the foot 26A, and supports the second to fourth metatarsal heads 28A to 32A and the ball of the lesser foot 34A. A V-shaped recess 105 is formed between the ball of the other toe 103 and the ball of the other toe 104. A recess 106 is formed at the rear edge of the front side protrusion 100. The outer peripheral part 102 of the front side protrusion 100 is inclined so that the thickness gradually decreases toward the outside of the front side protrusion 100. The back side protrusion 200 has a shape substantially similar to the front side protrusion 100, and is formed small.

FIG. 4(B) is a sectional view taken along line BB in FIG. On the surface 3A of the sole body 3, a cuboidal bone supporting convex portion 80 and a calcaneal anterior portion supporting convex portion 90 are formed.
FIG. 4(C) is a sectional view taken along line CC in FIG. A recess 129 in which the calcaneus 12 is accommodated is formed in the surface 3A of the sole body 3.

Figure 5 shows the arch of the sole of the foot.
In a natural state, an arch (schematically shown by a broken line) 119 is formed on the sole of a human foot when walking or running.
The arch 119 includes an inner longitudinal arch 121 and an outer longitudinal arch 122 formed in the longitudinal direction of the foot, and a transverse arch 120 formed in the lateral direction of the foot. As shown in FIG. 2, the transverse arch 120 is formed spanning between the first to fifth metatarsals 26 to 34. Furthermore, the medial longitudinal arch 121 is formed spanning the calcaneus 12, the talus 14, the navicular bone 16, the three cuneiform bones 20 to 24, and the first to third metatarsals 26 to 30. The lateral longitudinal arch 122 is formed across the calcaneus 12, the cuboid 18, and the fourth and fifth metatarsals 32 and 34.

FIG. 6 is a diagram showing the principle by which the user's weight F acts on the calcaneus 12 from the tibia 68 via the talus 14 when the sandals 1 are worn.
This calcaneus 12 becomes the key point for supporting the user's weight F. In the calcaneus 12, the anterior upper end 12B of the calcaneus serves as a force point P1, and the lower end of the calcaneus (rear part of the calcaneus) 12C serves as a fulcrum P2, so a moment about the fulcrum P2 acts on the calcaneus 12.
In this configuration, the calcaneus anterior support convex portion 90 can stabilize the calcaneus 12 by supporting the calcaneus tuberosity 12A substantially directly below the force point P1. In addition, since the calcaneus tuberosity 12A is located at a distance from the lower end of the calcaneus 12C, which is the fulcrum P2, by providing the anterior part of the calcaneus support convex portion 90 in the area corresponding to the calcaneus tuberosity 12A, the heel can be efficiently supported with a small force. Bone 12 can be supported.

The user's weight F also acts on the cuboid bone 18 via the calcaneus 12. Regarding the cuboid bone 18, the first to fifth metatarsal heads 26A to 34A serve as the fulcrum P3, so a moment about the fulcrum P3 acts on the cuboid bone 18.
In this configuration, the cuboid bone supporting convex portion 80 can stabilize the cuboid bone 18 by supporting the cuboid bone 18 substantially directly below the force point P1.
In addition, since the cuboidal bone 18 is far from the first to fifth metatarsal heads 26A to 34A, which are the fulcrum P3, by providing the cuboidal bone supporting convex portion 80 at a portion corresponding to the cuboidal bone 18, a small force can be applied. The cuboidal bone 18 can be supported efficiently by stroking.

If only the cuboidal bone 18 is supported, it is difficult to stabilize the calcaneus 12, and distortion may occur in the cuboidal bone 18, the calcaneus 12, and the joint (calcaneocuboid joint).
Since the calcaneus 12 constitutes both the medial longitudinal arch 121 and the lateral longitudinal arch 122 at the same time, unless the calcaneus 12 is stabilized, the longitudinal arch cannot be maintained in its normal position. In particular, the calcaneal tubercle 12A at the front of the calcaneus 12 is arranged so that the long plantar ligament 64, which connects the middle part of the calcaneus 12 and the second to fifth metatarsals 28 to 34, overlaps, as shown in FIG. positioned. This long plantar ligament 64 also functions to maintain the longitudinal arch.

In this configuration, the anterior part of the calcaneus support convex part 90 supports the calcaneus tubercle 12A via the long plantar ligament 64, so the calcaneus 12 is stabilized, distortion of the calcaneocuboid joint can be reduced, and the longitudinal arch is Can be placed in normal position. This allows the vertical arch to function more effectively as a spring. Particularly at night, the function of the long plantar ligament 64 to maintain the longitudinal arch is lower than during the day, so it is effective to support the long plantar ligament 64. The anterior calcaneus support convex portion 90 includes a region 4 corresponding to the calcaneus tuberosity 12A at a position where the long plantar ligament 64 overlaps.

The anterior calcaneus support convex portion 90 not only supports the plantar ligament longus 64 and promotes passive stability of the foot arch, but also supports the peroneus longus, which is important for active stabilization of the lateral longitudinal arch via the plantar ligament 64. Supports the stop tendon 66 of the muscle. Here, passive stabilization is provided by ligaments, and active stabilization is provided by muscles (tendons). After wrapping around the cuboid bone 18, the peroneus longus stop tendon 66 crosses the plantar surface from the lateral edge of the foot to the base of the first cuneiform bone 20 and the first metatarsal bone 26, as shown in FIG. Stop at. Further, a portion of the anterior calcaneus support convex portion 90 is located under the cuboid bone 18 and supports the navicular bone 16 via the cuboid bone 18. This indirectly supports the stop tendon 67 of the tibialis posterior muscle, which is the main active stabilizing structure of the medial longitudinal arch.
The stop tendon 67 of the tibialis posterior muscle provides fascia to the first to third cuneiform bones 20 to 24, the second to third metatarsals 28 and 30, and the navicular bone 16. The diagonal running of these two muscles, the peroneus longus and tibialis posterior, maintains the longitudinal arch in addition to the transverse arch.

Further, since the calcaneus 12 constitutes a joint, it is necessary to allow movement, since simply supporting it in a fixed manner will inhibit its movement function.
The sole body 3 has a structure in which the surface is inclined downward in the radial direction around the cuboidal bone supporting convex portion 80 to relieve stress, so that movement of the joint constituted by the calcaneus 12 is allowed. The anterior part of the calcaneus support convex part 90 sinks at its maximum thickness due to the weight of the user, and supports the calcaneus tuberosity 12A. As the anterior calcaneus support convex part 90 sinks, the sole body 3 tilts downward in the radial directions of the front, back, left and right around the cuboid support convex part 80, supporting the foot with the cuboid bone 18 as a fulcrum. , allowing movement of the foot around the cuboidal bone supporting protrusion 80.

In this configuration, the anterior calcaneus supporting convex portion 90 contacts the calcaneal tuberosity (front part of the calcaneus of the foot) 12A, and maintains the medial longitudinal arch 121, lateral longitudinal arch 122, and transverse arch 120 of the foot.
The calcaneus anterior support convex part 90 can stably support the calcaneus 12, and the transverse arch 120, medial longitudinal arch 121, and lateral longitudinal arch 122 of the sole are maintained in their natural shapes, and the foot Stability and mobility can be improved. Then, while the anterior calcaneus support convex portion 90 maintains the medial longitudinal arch 121, the lateral longitudinal arch 122, and the transverse arch 120, the front side protrusion 100 and the back side protrusion 200 are connected to the first part of the foot. It supports the metatarsal head (ball of the big toe) 26A and the second to fifth metatarsal heads (ball of the lesser foot) 28A to 34A.

With the sandals 1 having this configuration, you can train your toes just by wearing them and walking around. In particular, in this configuration, since the sandal 1 also includes the cuboidal bone support convex portion 80, the skeletal balance of the foot is adjusted, and stability and mobility are further improved.

In this configuration, as shown in FIG. 6, the back side protrusion 200 contacts the floor or the ground surface 112, and the surface portion 100A of the front side protrusion 100 allows the ball of the big toe 26A, the ball of the little foot 34A, etc. The first to fifth metatarsal heads 26A to 34A (toe base side) are held upward.
Therefore, the anterior calcaneus supporting convex portion 90 releases the toe restraint while maintaining the arched state of the foot.

In this configuration, the thickness of the front portion 110 in front of the surface side protrusion 100 is formed to be the thinnest among the thicknesses of the sole body 3.
Therefore, the front part 110 is one step lower than the surface-side protrusion part 100, and the degree of freedom of the fingers in front of the first to fifth terminal phalanges 54 to 62 of the foot is further increased.
The action of the toes grasping the ground is such that the so-called front part 110 on which the toes rest, including the proximal phalanges 36 to 44, middle phalanges 46 to 52, and distal phalanges 54 to 62 in FIG. This can be easily done if it is softer than the surface-side protrusion 100 on which the small toe ball 34A and the small toe ball 34A rest.
In this configuration, since the front part 110 is thinner than the front side protrusion 100, the toes can be easily moved.
Therefore, walking motions such as grasping the ground with toes can be easily performed, and the effect of exercise can be enhanced. In addition, the shape of the arch of the sole of the foot is maintained to ensure stability and mobility of the body, while enhancing the effect of exercise.

In this configuration, since the backside protrusion 200 is formed on the backside 3B, a gap 111 is created between the front part 110 and the ground plane 112, as shown in FIG. Therefore, when walking, it is easy to push the front part 110 of the sole body 3 toward the gap 111 from above. In addition, a V-shaped recess 105 is also formed in the front side protrusion 100, and the space between the ball of the big toe 103 and the ball of the other toe 104 is thin, and the front part 110 can be pushed toward the gap 111 with the big toe. easy.
In this way, in this embodiment, it becomes easier to bend the toes and to apply force to the toes, making it easier to grasp the ground with the toes.

Furthermore, since the flat surface portion 100A of the surface side protrusion 100 contacts the sole of the foot, movement of the foot is less likely to be hindered than when the uneven shape contacts the sole of the foot.
On the other hand, since the movement of the foot is not easily obstructed, there is a possibility that the positions of the ball of the big toe 26A and the ball of the little foot 34A may shift during walking or exercise, but the surface side protrusion 100 is formed wide in the front-rear direction. Therefore, the front side protrusion 100 can support the ball of the big toe 26A and the ball of the little toe 34A.

The sandals 1 may be worn indoors or outdoors.
It is desirable that the outer diameter X2 of the backside protrusion 200 be relatively large and flat, and that the hardness of the resin be high.
When considering the flexibility of the toes, the front side protrusions 100 are formed so as to protrude by 2 to 3 mm in the front-rear direction of the sole body 3, and the outer shape X1 is formed to be 4 to 6 mm larger than the outer shape X2. It is desirable to form the
When considering the flexibility of the toes, it is desirable that the back side protrusion 200 extends in the width direction of the sole body 3 in a band shape.

Generally, the sandals 1 have a high heel side and a low toe side to make walking easier, but since the toe side is low, force is easily applied to the toe side when weight is applied. As a result, it is difficult to move the toes, and the natural movement of the toes may be inhibited.
In contrast, in this configuration, the front side protrusion 100 and the back side protrusion 200 hold the ball of the big toe 26A and the ball of the little foot 34A at a high position, so that the foot supported by the sandal 1 approaches the horizontal position. This makes it difficult to put weight on the toe side in front of the fulcrum P3 (see FIG. 6), making it easier to move the toe.

As explained above, the sandal 1 of this embodiment includes a sole body 3 on which the foot is placed, and a string or belt 5 provided to prevent the sole body 3 from separating from the foot. In order to maintain the arch 121, the lateral longitudinal arch 122, and the transverse arch 120, a calcaneus anterior support convex portion 90 that contacts the anterior calcaneus 12A of the foot, and a protruding portion 90 that protrudes from the surface of the sole body 3 and supports the ball of the foot. 26A and the ball of the foot 34A; a front part 110 that is thinly formed in front of the surface side projection 100; 26A and the small toe ball 34A, and a backside protrusion 200 that forms a gap 111 between the front part 110 and the ground plane 112 of the sole body 3.
Therefore, the shape of the arches 120 to 122 of the soles of the feet is maintained in a natural state to ensure stability and mobility of the body, while making it easier for the toes to grasp the ground, giving training to the toes. can be made to do so.

In the sandals 1 of this embodiment, the outer shape of the front side protrusion 100 is larger than the outer shape of the back side protrusion 200.
Therefore, it is easier to make the toes grasp the ground, and a training effect can be obtained. Further, wear of the back side protrusion 200 can be suppressed.

In the sandals 1 of the present embodiment, the front upper end of the calcaneus serves as a point of effort, the rear part of the calcaneus serves as a fulcrum, and a moment is applied around the fulcrum, and the front part of the calcaneus support convex portion acts on the calcaneus of the foot. , since it supports the calcaneal tubercle, which is located almost directly below the point of effort, it makes it easier for the toes to grip the ground, resulting in a training effect.

In the sandal 1 of this embodiment, the front edge of the surface side protrusion 100 extends on a line connecting the first proximal phalanx 36 to the fifth proximal phalanx 44 of the foot.
Therefore, it becomes easier to push down the big toe, that is, the part of the sole body 3 corresponding to the first proximal phalanx 36 and the first distal phalanx 54, and it becomes easier to make the big toe perform a motion of grasping the ground, which improves the training effect. can get.

In this embodiment, the surface side protrusion 100 has a thickness that gradually decreases at the outer peripheral portion. Therefore, since the outer circumferential portion 102 of the front side protrusion 100 can be gradually deformed according to the body weight, the discomfort felt on the feet can be reduced.

In the sandal 1 of the present embodiment, a cuboidal bone supporting convex portion 80 is arranged to overlap the anterior calcaneal support convex portion 90, and the cuboidal bone supporting convex portion 80 corresponds to the cuboid bone 18 to the navicular bone 16 of the foot. including parts

In this configuration, since the outer shape X4 of the back side protrusion 200 is formed to be slightly smaller than the outer shape X3 of the front side protrusion 100, it becomes easier to bend the toes and it is easier to put pressure on the toes. You can easily grasp the ground with your toes.
The sandals 1 may be worn indoors or outdoors.
In the case of outdoor shoes, wear of the back side protrusion 200 becomes a problem compared to indoor shoes. In this case, it is desirable that the back side protrusion 200 has a flat shape and extends in a band shape in the width direction of the sole body 3.

Generally, sandals have a high heel side and a low toe side to make walking easier, but because the toe side is low, the toes tend to be dorsiflexed. As a result, it is difficult to move the toes, and the natural movement of the toes may be inhibited.
In contrast, in this configuration, the front side protrusion 100 and the back side protrusion 200 hold the ball of the big toe 26A and the ball of the little foot 34A at a high position, so that the foot supported by the sandal 1 approaches the horizontal position. This makes it difficult to put weight on the toe side in front of the fulcrum P3 (see FIG. 6), making it easier to move the toe.

As explained above, the sandal 1 of this embodiment includes a sole body 3 on which the foot is placed, and a string or belt 5 provided to prevent the sole body 3 from separating from the foot. In order to maintain the arch 121, the lateral longitudinal arch 122, and the transverse arch 120, a calcaneus anterior support convex portion 90 that contacts the anterior calcaneus 12A of the foot, and a protruding portion 90 that protrudes from the surface of the sole body 3 and supports the ball of the foot. 26A and the ball of the foot 34A; a front part 110 that is thinly formed in front of the surface side projection 100; 26A and the small toe ball 34A, and a backside protrusion 200 that forms a gap 111 between the front part 110 and the ground plane 112 of the sole body 3.
Therefore, the shape of the arches 120 to 122 of the soles of the feet is maintained in a natural state to ensure stability and mobility of the body, while making it easier for the toes to grasp the ground, giving training to the toes. can be made to do so.

In the sandals 1 of this embodiment, the outer shape of the front side protrusion 100 is larger than the outer shape of the back side protrusion 200.
Therefore, it is easier to make the toes grasp the ground, and a training effect can be obtained. Further, wear of the back side protrusion 200 can be suppressed.

In the sandals 1 of the present embodiment, the front upper end of the calcaneus serves as a point of effort, the rear part of the calcaneus serves as a fulcrum, and a moment is applied around the fulcrum, and the front part of the calcaneus support convex portion acts on the calcaneus of the foot. , since it supports the calcaneal tubercle, which is located almost directly below the point of effort, it makes it easier for the toes to grip the ground, resulting in a training effect.

In the sandal 1 of this embodiment, the front edge of the surface side protrusion 100 extends on a line connecting the first proximal phalanx 36 to the fifth proximal phalanx 44 of the foot.
Therefore, it becomes easier to push down the big toe, that is, the part of the sole body 3 corresponding to the first proximal phalanx 36 and the first distal phalanx 54, and it becomes easier to make the big toe perform a motion of grasping the ground, which improves the training effect. can get.

In this embodiment, the surface side protrusion 100 has a thickness that gradually decreases at the outer peripheral portion. Therefore, since the outer circumferential portion 102 of the front side protrusion 100 can be gradually deformed according to the body weight, the discomfort felt on the feet can be reduced.

In the sandal 1 of the present embodiment, a cuboidal bone supporting convex portion 80 is arranged to overlap the anterior calcaneal support convex portion 90, and the cuboidal bone supporting convex portion 80 corresponds to the cuboid bone 18 to the navicular bone 16 of the foot. The thickness is gradually decreased by tilting downward toward the left and right side edges including the cuboid bone 18, and the thickness is gradually decreased by tilting downward toward the front and rear from the portion corresponding to the cuboid bone 18, and the thickness is gradually decreased in the radial direction of the front, back, left, and right. Decrease gradually.
Since the cuboid bone supporting convex portion 80 is provided, the cuboid bone 18 and the calcaneus 12 can be moved while maintaining the arch shape including the calcaneocuboid joint between the cuboid bone 18 and the calcaneus 12 and allowing movement of the foot. Since it is stabilized, distortion of the calcaneocuboid joint is reduced, and the entire tarsal bone including the cuboid bone 18 and the calcaneus 12 is stabilized in its natural state. Since the joints of the feet can move freely, the functions of the feet can be improved.

The embodiment described above is one aspect of the present invention, and it goes without saying that changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the above embodiment, the sole body 3 is integrally molded, but the separate convex portion 2, the front side protrusion 100, and the back side protrusion 200 are detachably attached to the flat sole body material. You may do so. Further, by forming the sole body 3 in multiple layers and attaching the convex portion 2, the front side protrusion 100, and the back side protrusion 200 to the intermediate layer, it is possible to form irregularities on the surface material. Although the cuboidal bone supporting protrusion 80, the anterior calcaneus support protrusion 90, and the surface side protrusion 100 were formed solidly, the cuboidal bone supporting protrusion 80, the anterior calcaneus support protrusion 90, and the surface side protrusion 100, the inside of the back side protrusion 200 may be hollow.

The footwear of the present invention is aimed at improving standing posture and improving motor function, and is suitable not only for daily use, but also for medical footwear for treatment and rehabilitation, and training for the purpose of promoting health. It is suitable for a wide variety of footwear such as footwear for children.

1 Sandals (footwear)
3 Sole body 3A Surface (top surface)
3B Back side (bottom side)
12A Calcaneal tubercle (anterior part of the calcaneus)
18 Cuboidal bone 26A Ball of the big toe 34A Ball of the lesser foot 36 First proximal phalanx 38 Second proximal phalanx 44 Fifth proximal phalanx 80 Cuboid bone supporting convex portion 90 Anterior calcaneal support convex portion 100 Surface side protrusion (surface Lateral toe ball support part)
110 Front part 111 Gap 120 Lateral arch 121 Inner longitudinal arch 122 Outer longitudinal arch 200 Back side protrusion (back side toe ball support part)

Claims (6)

comprising a sole body on which the foot is placed, and a string or belt provided to prevent the sole body from separating from the foot;
The sole body protrudes from the surface of the sole body to maintain the medial longitudinal arch, lateral longitudinal arch, and transverse arch of the foot, and supports the calcaneal tubercle of the foot to stabilize the calcaneus. a convex part, a front side toe ball support part that protrudes from the surface of the sole body and supports the ball of the big toe and the little toe ball of the foot, and a front part formed thinly in front of the front side toe ball support part. and a back side toe ball support part that protrudes from the back surface of the sole body, supports the ball of the big toe and the ball of the little toe, and forms a gap between the front part and the contact surface of the sole body. , footwear comprising: The footwear according to claim 1, wherein the outer shape of the front side toe ball support part is larger than the outer shape of the back side toe ball support part. On the calcaneus of the foot, the front upper end of the calcaneus serves as a point of effort, the rear part of the calcaneus serves as a fulcrum, and a moment is applied around the fulcrum, and the front part of the calcaneus supporting convex portion is located approximately directly below the point of effort. Footwear according to claim 1 or 2, wherein the footwear supports the calcaneal tuberosity of. The footwear according to any one of claims 1 to 3, wherein the front edge of the superficial toe ball support portion extends on a line connecting the first proximal phalanx to the fifth proximal phalanx of the foot. The footwear according to any one of claims 1 to 4, wherein the back side toe ball support portion extends in a band shape in the width direction. A cuboidal bone supporting convex portion is arranged to overlap the anterior calcaneus supporting convex portion,
The cuboidal bone supporting convex portion includes a portion corresponding to the scaphoid bone from the cuboid bone of the foot, and gradually decreases in thickness from the portion corresponding to the cuboid bone toward the left and right side edges, and extends from the portion corresponding to the cuboid bone toward the front and back. 6. Footwear according to any one of claims 1 to 5, wherein the footwear gradually decreases in thickness by tilting downward, and gradually decreases in thickness in radial directions of front, rear, left, and right.

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