JP2008043646A - Shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe with such a sole surface that the weight of a user acts on the sole in the appropriate state from an ergonomic point of view. <P>SOLUTION: The shoe has the sole 1 with a recessed part 2 formed in the front of the surface 1A. The recessed part 2 is disposed in the region abutting to the sole under the region continued in the distal end direction from five metatarsi D1-D5 to the center of the metatarsus joints C1-C5, from the first metatarsus D1 to the fifth metatarsus D5 in the cross direction and in the front/rear direction of the sole surface 1A of the shoe. The recessed part 2 has such a shape that a virtual face P with lines P1-P5 connecting the distal ends of the metatarsi D1-D5 with the respective metatarsus joints in the front/rear direction is horizontally formed when a foot is put on the sole with the heel part 1R located about 4-6 cm higher than the toe part 1T while the user is standing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, the weight is applied to the sole of the right or left foot evenly in the left-right direction, particularly in the stance phase (when the foot supports the weight during walking: When the weight is supported by the foot, the weight acts equally in the width direction of the foot (also simply referred to as the width direction), making it possible to ideally walk and take an ideal standing posture. It relates to shoes that can.

The standing posture or standing posture of a person walking differs depending on the person, depending on the personal skeleton, the “fuzz” at the time of walking, and the shoes worn.
However, in general, when taking a standing or standing posture in the state of bare feet, the direction of the weight acting on the sole via the legs is not from directly above, but generally from the outside of the legs to the inside. It works from the diagonal direction that faces. For this reason, a person is unconsciously using various muscles of the legs and legs to balance the inclination. Such a situation also occurs when wearing conventional shoes.

  As a result, when walking for a predetermined time or standing posture for a predetermined time, it is unnecessary only to spend muscles such as legs to correct the tilt and to force an unreasonable posture. Cause a lot of fatigue. In addition to the energy spent for the correction, a burden on each joint is added, and fatigue is doubled.

By the way, as a conventional technique, when walking or the like, the first foot of the foot is prevented so as not to cause a so-called “octopus” or “blister” due to a slip of the sole on the upper surface of the sole of the shoe. A shoe is disclosed in which a through hole is formed on the sole surface with which the sole (also referred to as the thumb hill) below the tip of the metatarsal bone contacts (see Patent Document 1).
Japanese Patent No. 3462092.

  However, in the case of the shoe described in the above-mentioned Patent Document 1, it is difficult for the soles to slip back and forth and from side to side with respect to the sole surface, and the “octopus” and “blister” can be prevented. However, considering the amount of weight applied to the sole in the stance phase, the above-described problem due to the inclination of the leg exists.

  Further, in the case of the shoe described in Patent Document 1, since the through hole is provided in the insole disposed on the sole, the shoe becomes higher by the height of the insole, It becomes difficult to perform the plantar flexion exercise in the stance phase, and as a result, muscles such as legs are used unnecessarily. In addition, in the case of women's shoes, fashionability is regarded as important, so using a high (thick) insole as described above will increase the height of the shoes by that amount, thereby impairing fashionability. It is difficult to adopt such insoles for shoes that emphasize fashion.

  The present invention has been made in view of such a situation, and has a sole surface in which the weight acts in an appropriate state from the ergonomic point of view on the sole, and does not impair fashionability. The purpose is to provide shoes.

The shoe according to the present invention is a shoe having a sole in which a recess is formed in the front part of the surface.
The concave portion extends from the first metatarsal bone to the fifth metatarsal in the width direction of the sole surface of the shoe and through each metatarsophalangeal joint extending from each metatarsal to the distal end in the front-rear direction. A state where the lower sole portion of the region extending to the center of the bone is in contact with the sole portion, and the concave portion is positioned about 4 cm to 6 cm above the toe portion of the foot in the stance phase. In this case, the hypothesis having in-plane lines extending in the front-rear direction connecting the central portions of the proximal phalanges through the metatarsal joints from the distal ends of the metatarsals of the foot placed on the sole. The surface is a recess having a shape that forms a substantially horizontal state.

According to the shoe including the sole according to the present invention configured as described above, the recess is configured as described above at the end of the stance phase in which the weight acts most on the recess and the vicinity thereof. As a result, the weight acts on the foot evenly in the width direction and from directly above, so that the muscles such as the legs are in the most appropriate state. Specifically, the triceps surae muscles (gastrocnemius muscles (medial head, lateral head) and soleus muscles) act at the end of the stance phase because the weight acts equally and directly above in the width direction as described above. ) Of the gastrocnemius muscle and the posterior tibial muscle of the base flexor muscle group and the long peroneal muscle perform ideal activities. For this reason, since there is no use of useless muscles, it becomes a shoe with much less fatigue compared to the case of wearing shoes with a conventional sole. In addition, when walking, as described above, the weight acts on the foot evenly from directly above and in the width direction, so there is no distortion or inclination in the body axis during walking, so a trained model can be used. It is possible to walk with a beautiful posture as if walking. This is not only because the posture of walking is beautiful, but also because there is no use of unnecessary muscles and excessive force does not act on joints etc. as mentioned above, fatigue during walking can be greatly reduced. Connected.
Further, during the stance phase, the movement trajectory of the weight acting on the sole passes through the center portion in the foot width direction of the sole portion from the heel portion to the first metatarsal portion to the fifth metatarsal portion. Since the toes are substantially linear, weight shift in a very lean and stable state is realized.
In addition, when maintaining a standing posture, the lower sole portion from the first metatarsal portion to the fifth metatarsal portion is evenly distributed in the width direction and the body weight from directly above Because it works, there is no need to activate useless leg and foot muscles to balance the body. Therefore, compared with the case where the shoes etc. which were equipped with the conventional sole are put on, fatigue becomes extremely less.
Furthermore, as described above, since the weight is evenly distributed in the width direction and acts from directly above, the burden on the joints such as knees is greatly increased even when walking or standing. Will be reduced. And since the recessed part is formed in the sole surface, since the height of shoes is not made high unnecessarily, it becomes a shoe provided with high fashionability.

  Further, in the shoe, the concave portion has the first metatarsal joint in the width direction and the first metatarsophalangeal joint extending from the front portion of the first metatarsal to the distal end in the front-rear direction. A first concave portion where a lower sole portion of a region in the middle of the bone abuts, a second metatarsal to a fifth metatarsal in the width direction from the second metatarsal to the fifth metatarsal and in the anteroposterior direction. Below the region from the front part of each metatarsal bone to the distal part of the second metatarsal joint to the middle part of the fifth metatarsal joint through the fifth metatarsal joint. A width that further matches the shape of the sole when the sole portion is in contact with the second recess and is shallower than the first recess by being connected in the width direction of the sole. The preferred structure is comfortable and comfortable to wear, with weight acting evenly distributed in the direction. To become.

  Further, in the shoe, if at least the concave portion and the vicinity thereof of the sole are made of a material having a rubber hardness of about Hs 80 degrees, a sole flexion movement (on the sole) When such weight is moved from the heel part to the front part of the foot, it is possible to realize a shoe having a configuration that can smoothly perform the exercise of bending the metatarsophalangeal joint. For this reason, ideal activities of the lateral head of the gastrocnemius, the posterior tibial muscle, and the long peroneal muscle can be obtained in the stance phase. Moreover, since the sole has an appropriate hardness, the shoe is in a comfortable state even if it contacts the sole.

  Further, in the above shoes, if the shoes are women's shoes and the thickness from the bottom of the concave portion to the bottom of the sole is 8 mm or less, the flexibility (sole bending motion) of the shoes increases, and the shoes having a more preferable configuration. It becomes.

  According to the shoe of the present invention, it is possible to realize a shoe having a sole surface whose weight acts optimally from the ergonomic point of view with respect to the sole, and when taking a walking or standing posture Even shoes that are hard to get tired.

      Hereinafter, shoes according to embodiments of the present invention will be specifically described with reference to the drawings, taking women's slightly high-heeled shoes as an example.

  FIG. 1 is a perspective view of the entire sole showing the construction of the sole of the shoe of the present invention as seen obliquely from the front, and FIG. 2 is formed at a portion where the first and second metatarsal portions of the sole shown in FIG. FIG. 3 is a cross-sectional view taken along the line II-II in FIG. 1 showing the cross-sectional shape of the concave portion, and FIG. 3 is a diagram showing the cross-sectional shape of the concave portion formed in the portion where the second to fifth metatarsal portions of the sole shown in FIG. FIG. 4 is a cross-sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

  In FIG. 1, reference numeral 1 denotes a shoe sole. Above the sole 1, a so-called upper 5 (refer to a two-dot chain line in FIG. 2) is integrally provided with a skin or cloth covering the instep and the side. .

  And the recessed part 2 is formed in the front part of the surface (upper surface) 1A of the said sole 1. As shown in FIG. As shown in FIG. 5, the recess 2 extends from the first metatarsal D1 to the fifth metatarsal D5 in the width direction and in the front-rear direction of the first metatarsal D1 to the fifth metatarsal D5. It is provided in the site | part which the sole part below the area | region which contacts each center part of each proximal phalanx B1-B5 through each metatarsophalangeal joint C1-C1 which continues from a part to the front end (toe direction) contact | abuts. .

  The recess 2 is formed on the sole surface in the stance phase shown in FIG. 6 from the state in which the entire back surface ranging from the toe portion 1T to the heel portion 1R of the sole 1 is grounded as shown in FIG. With the heel portion 1R on 1A positioned approximately 5 cm (about 4 cm to 6 cm) indicated by reference numeral H2 relative to the toe portion 1T, the foot placed on the sole 1 is Imaginary plane having lines P1 to P5 (see FIG. 5) in-plane connecting the front parts of the metatarsals D1 to D5 of the foot and the base phalanges B1 to B5 through the metatarsal joints C1 to C5. P (see FIG. 5: a substantially planar virtual surface) is shaped so as to be in a substantially horizontal state (a state that is a true horizontal state or a state in which it is slightly tilted up or down from that state). Further, as shown in FIG. 2, in the case of the sole 1 according to this embodiment, the surface 1A has a shape close to a so-called “high heel” in which the heel portion 1R is higher by about 3 cm than the toe portion 1T. Therefore, when the shoe equipped with the sole 1 is worn, the above-described “state where the heel portion 1R of the sole surface is positioned about 3 cm higher than the toe portion 1T” in the worn state is obtained. When the shoes equipped with are attached, the respective lines P1 to P1 connecting the front part of each metatarsal bone D1 to D5 of the foot and the center part of each phalangeal bone B1 to B5 through the metatarsal joints C1 to C5 in the front-back direction. The virtual plane P having P5 in the plane is in a state close to a substantially horizontal state.

  Further, the configuration of the concave portion 2 will be described in detail. As shown in FIGS. 1 and 4, the concave portion 2 has the first metatarsal bone D1 (see FIGS. 2 and 5) in the width direction and the front and rear direction. A first recess 2A with which the bottom sole portion of the region extending from the front portion of the first metatarsal bone D1 to the distal end of the first metatarsal joint C1 to the first proximal phalanx B1 comes into contact; A second metatarsal phalanx that continues from the front part of each of the second metatarsal bone D2 to the fifth metatarsal bone D5 in the anteroposterior direction from the second metatarsal bone D2 to the fifth metatarsal bone D5 in the width direction. The sole part below the region abuts on the center of each of the second proximal phalanx B2 to the fifth proximal phalange B5 through the joint C2 to the fifth metatarsophalangeal joint C5 and the first recess 2A. The second recess 2B having a shallower recess is connected in the width direction of the sole 1 to be configured. There. That is, as shown in FIGS. 1 to 5, the concave portion 2 has a shape substantially corresponding to the shape of a so-called “finger M (see the two-dot chain line in FIG. 2)” of the human foot, It has a three-dimensional shape that substantially complements the downward projecting shape of “M”. In other words, the concave portion 2 is substantially three-dimensionally coincident with the surface of the sole 1 in which the finger mound M on the sole and its peripheral portion are substantially horizontal when the virtual plane P is in the above condition. It is comprised in the shape which can form such a state.

  The sole 1 is actually preferably composed of urethane rubber having a rubber hardness Hs of about 70 to 90 degrees. In this embodiment, the sole 1 is composed of urethane rubber having a hardness of about 80 degrees rubber hardness Hs. The sole 1 is manufactured by being integrally molded using a mold. As described above, urethane rubber is used as the material of the sole 1 because the thickness of the sole 1 is shown in FIGS. 2 to 4 and FIG. This is because the wear resistance (durability) is generally required as a shoe even when the thickness of the sole 1 is reduced. Further, in this embodiment, the entire sole 1 is made of urethane rubber having the above hardness, but at least the concave portion 2 and its vicinity may be made of urethane rubber having the above hardness.

  Further, the thickness H (see FIG. 4) from the bottom of the concave portion 2, that is, the most concave portion to the bottom surface of the sole 1, is preferably 8 mm or less in order to perform the above-mentioned smooth bottom bending motion. In this embodiment, the thickness is about 4 mm to 5 mm, more precisely about 4 mm. However, it is not limited to the numerical value of 4 mm or 4 mm to 5 mm, and may be 8 mm or less, for example, 7 mm, 6 mm, or 3 mm. However, the minimum thickness is desirably at least 3 mm from the viewpoint of practical durability.

  Further, the outer edge 1a of the surface of the sole 1 rises by a predetermined height (about 1 mm in this embodiment) with rounded corners, and when the shoe equipped with the sole 1 is worn, It is comprised so that it may be hold | maintained in the state wrapped from the outer side by the outer edge of this sole 1 from the circumference | surroundings. In the case of this embodiment, from the viewpoint of weight balance in the front-rear direction (longitudinal direction) of the sole 1 and the weight reduction of the entire weight, the heel portion 1R of the sole 1 having a thicker thickness has a thickness. A plurality of bottomed holes (holes not penetrating to the bottom of the sole 1) 1h extending in the direction are formed. However, such a bottomed hole 1h is an additional structure and is not necessarily essential. The number may be increased or decreased depending on the diameter of the bottomed hole 1h.

  In addition, when the sole 1 thus configured is actually used as a shoe sole 1, the surface 1A of the sole 1 has a thin thickness so as to cover the bottomed hole 1h from above. Sheet material such as vinyl leather or cloth and leather is stretched. Moreover, the edge part of the upper 5 (refer FIG. 2) of shoes is generally fixed in the state wound (blanked) between the said sole 1 and the said sheet | seat material. However, the fixing of the upper 5 is not limited to such a configuration, and may be a configuration in which the end of the upper 5 is fixed to the side surface of the sole 1.

The sole 1 according to the present embodiment configured as described above is used as a part of the shoe, that is, as the sole 1 of the shoe, and thus acts as follows and has an effect. That is,
In the case of the shoe including the sole 1 as described above, when the shoe is worn and maintained in the standing posture (or the stance phase), as described above, the distal ends of the metatarsals D1 to D5. Since the virtual plane P having in-plane each line P1 to P5 (see FIG. 5) connecting the central portion of each proximal phalange B1 to B5 through the center and each metatarsophalangeal joint C1 to C5 is in a substantially horizontal state, The weight acts on the sole 1 from substantially above, and the weight is distributed substantially evenly in the width direction of the sole 1. For this reason, the various muscles that act when maintaining a standing (or stance) posture, such as when wearing conventional shoes (also called ordinary shoes) or bare feet, tilt the legs etc. There is no need to take unnecessary action to correct it. Therefore, even if the user stands in a standing position for a long time or walks with this shoe, it is much less likely to get tired than when wearing conventional shoes.

  In addition, when walking with the shoes equipped with the sole 1 according to this embodiment, the weight acts in the stance period in a substantially even distribution in the foot width direction of the sole 1, so that the inclination of the leg mainly during the stance period. The lateral head of the gastrocnemius muscle does not perform useless activities for the correction and is ideal for the lateral head of the gastrocnemius muscle, the posterior tibial muscle, the long peroneal muscle, etc. in the stance phase. Activities. For this reason, fatigue due to walking is greatly reduced. Further, since excessive force does not act on the hip joint, knee joint and ankle joint, these joints are not unnecessarily damaged.

In order to scientifically prove the above effects, specialized institutions such as “Kansai Kai University (Location: 2-11-11 Wakaba, Kunatori-cho, Sennan-gun, Osaka)” and “Kobe Rehabilitation College (Location) : Hyogo Prefecture, Kobe City, Chuo-ku, Kofundori 1-chome 2-2), and obtained measurement data on activities of the lateral head of the gastrocnemius, the posterior tibial muscle, the long peroneal muscle during walking including the stance It was. That is, the data (electromyogram polygraph showing the activity of various muscles of the leg) obtained when walking with the shoe equipped with the sole 1 according to the present embodiment shown in FIG. 7 is the conventional data shown in FIG. Compared with data obtained when walking with the shoes of No. 1 and data obtained when walking with bare feet shown in FIG. 9, it is approximated to data indicating ideal muscle activity obtained during walking. Specifically, a special order is placed without any particular consciousness on the same subject (a person who walks in a standing position while wearing shoes equipped with the sole 1 for data collection). It is data collected by walking normally without
In the case of bare feet shown in FIG. 9, one step W8 during walking (step from landing the heel part to the next landing) is short in time, and the normal shoe shown in FIG. In this case, the one step W7 during walking is longer than that in the case of bare feet, and in the case of the shoe having the sole 1 according to the present embodiment illustrated in FIG. You can see that it is getting longer. In this way, one step being longer in time means that the weight support by the foot is improved in the walking state. In other words, it is known that the lower the supportability (unstable state), the lesser the fall, the next step is taken at an earlier timing. Thus, if the one step is shortened, walking is not stable. It is also clear from the progress of the infant's walking state that gradually becomes stable from the state and the evolution state of the biped robot and the like. Thus, it can be seen that the shoes having the sole 1 according to the present embodiment are better in supportability than the case of bare feet or the case of wearing ordinary shoes.

  Next, the so-called “kicking out” operation at the end of the stance phase is for moving forward by the reaction, and is an important element for realizing efficient walking. In the diagram showing the activity of the gastrocnemius lateral head A1 in the case of the above, there is no conspicuous activity such as “appears only at the end of the stance phase”, and the active state is almost the same as the previous state. On the other hand, in the diagram showing the activity of the gastrocnemius lateral head A1 in the case of wearing ordinary shoes shown in FIG. 8, the “kicking out” operation is shown showing the outstanding activity only at the end of the stance phase. I know that. On the other hand, in the diagram showing the activity of the gastrocnemius lateral head A1 when the shoe having the sole 1 according to the present embodiment shown in FIG. 7 is worn, the activity that is conspicuous only at the end of the stance phase is shown. It can be seen from the electromyogram that a stronger “kicking out” action is performed. From this, it can be seen that in the case of the shoe provided with the sole 1 according to the present embodiment, walking is performed more efficiently than in the case of bare feet or normal shoes. In addition, when the shoe equipped with the sole 1 according to the present embodiment illustrated in FIG. 7 is worn, the activity time of the gastrocnemius lateral head A1 is larger than that when the normal shoe illustrated in FIG. 8 is worn. It can be seen that the movement of weight from the heel part to the toe part is performed more clearly and a walking state close to ideal is obtained.

  Further, in the case of the bare foot shown in FIG. 9, the ankle joint flexor muscle group extends from the stance phase to the swing phase (when the foot does not support the weight during walking: also called the swing leg phase). It can be seen that the activities of the gastrocnemius lateral head A1 and the long peroneal muscle A4 are continuously observed, and the weight shift between the left and right feet is not clearly made. On the other hand, when the normal shoes shown in FIG. 8 are worn, the activities of the gastrocnemius lateral head A1 and the long peroneal muscle A4 are recognized at regular intervals, and the weight shift between the left and right feet is observed. You can see that it is done clearly. On the other hand, when the shoe equipped with the sole 1 according to the present embodiment shown in FIG. 7 is worn, the activities of the gastrocnemius lateral head A1 and the long peroneal muscle A4 are recognized at regular intervals. It can be seen that the weight shift between the legs is "more clearly". From this, in the case of the shoe provided with the sole 1 according to the present embodiment, it can be seen that the movement of the weight between the left and right feet is performed very clearly and efficient walking is performed.

In addition, when a shoe equipped with the sole 1 according to the present embodiment shown in FIG. 7 is worn, immediately after the stance phase, the gastrocnemius lateral head A1 and the anterior tibial muscle A3 that were active at the end of the stance phase. It can be seen that the activities of the posterior tibial muscle A4, the toe extensor muscle A5, etc. are stopped and these muscles are relaxed. On the other hand, when the normal shoes shown in FIG. 8 are worn, the activities of the posterior tibial muscle A4 and the toe extensor muscle A5 are performed immediately after the stance phase, and these muscles relax. It turns out that it is not.
This indicates that the shoe provided with the sole 1 according to the present embodiment has less fatigue due to walking than that of a normal shoe.

  In addition, regarding the amount of activity of each muscle that is active during walking in walking, as shown in FIG. 10 in which the value of myoelectricity is integrated over time, in the case of a shoe equipped with the sole 1 according to this embodiment, It can be seen that the amount of activity of the gastrocnemius lateral head A1 that acts to correct the inclination of the legs is smaller than when barefoot or ordinary shoes are worn. Further, in the case of the shoe having the sole 1 according to the present embodiment, the gastrocnemius medial head A2, the anterior tibial muscle A3, and the posterior muscle, which are active during walking, compared to the case of wearing normal shoes. It is clear that the amount of activity of each of the tibial muscle A4, the long peroneal muscle A4, and the ankle extensor muscle A5 is small. In particular, with regard to the amount of activity of the toe extensor muscle A5, it can be seen that the difference in the amount of activity between the shoe having the sole 1 according to the present embodiment and the normal shoe is particularly significant.

  Therefore, when wearing the shoes having the sole 1 according to the present embodiment, an ideal walking state and an ideal standing state are obtained compared to the case of wearing bare feet or ordinary shoes. In addition, when walking or maintaining a standing posture, there is little fatigue, and an excessive burden is not caused on the hip joint and knee joint as well as the ankle joint.

  Further, as in the present embodiment, by forming a recess on the surface of the sole itself, the above-described effects can be achieved, and the height of the shoe itself does not increase, so that a shoe with excellent fashionability can be realized. .

  7-9, the vertical line E01-E01 (W6, W7, W8) has shown one stance period at the time of a walk. In these drawings, the horizontal axis indicates the time axis, and the vertical axis indicates the myoelectricity (weak voltage: unit mV) generated by each muscle, and shows the activity state of each muscle.

  By the way, in the said embodiment, although the sole 1 whole is comprised with the material of the hardness whose rubber hardness is about Hs80 degree | times, it is not limited to such a structure, At least the said recessed part 2 and its It is only necessary that the vicinity portion is made of a material having such a rubber hardness of about Hs 80 degrees. Further, in the above-described embodiment, the women's shoes having a form somewhat close to high heels have been described as an example. However, the present invention is not limited to this embodiment, and may be low heels. It can also be applied to. In addition, in terms of size, it goes without saying that the above-described effects can be obtained by wearing shoes having the above-described configuration according to the size of the foot of the user, from a person with a large foot size to a person with a small foot size. Yes.

  By the way, the present invention is not limited to the above-described embodiments, and it goes without saying that those skilled in the art can implement the present invention in appropriately modified forms within the obvious range.

  The shoes according to the present invention can be used for various shoes and slippers.

It is a perspective view of the whole sole which shows the composition of the sole of the shoes of the present invention. It is the II-II arrow sectional view of FIG. 1 which shows the cross-sectional shape of the recessed part formed in the part which the 1st and 2nd metatarsal of the sole shown in FIG. 1 contact | abuts. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 showing a cross-sectional shape of a recess formed in a portion where the second to fifth metatarsals of the sole shown in FIG. 1 contact. FIG. 4 is a cross-sectional view taken along arrows IV-IV in FIG. 1, showing a cross-sectional shape in the width direction of a recess formed in a portion where the metatarsal abuts. It is a top view which shows the positional relationship with a 1st-5th metatarsal bone, metatarsophalangeal joint, etc., and the recessed part of a sole. FIG. 3 is a diagram showing a state in which the heel portion is positioned approximately 4 to 6 cm higher than the toe portion from the state illustrated in FIG. It is an electromyogram of each muscle at the time of walking, wearing shoes provided with a sole concerning this embodiment. It is an electromyogram of each muscle when walking with conventional shoes on. It is an electromyogram of each muscle when walking barefoot. It is the figure which showed the integrated value which integrated the value of the myoelectric of each muscle of each electromyogram shown in FIGS. 7-9 by time with the bar graph for every muscle.

Explanation of symbols

D1 ... 1st metatarsal bone
D5 ... 5th metatarsal bone B1-B5 ... Each proximal phalanx C1-C5 ... Each metatarsophalangeal joint D1-D5 ... Each metatarsal bone P1-P5 ... Each line
P ... Virtual plane
1 ... sole 1R ... heel part 1T ... heel part
2 ... concave portion 2A ... first concave portion 2B ... second concave portion

Claims (4)

In a shoe with a sole in which a recess is formed on the front part of the surface,
The concave portion extends from the first metatarsal bone to the fifth metatarsal in the width direction of the sole surface of the shoe and through each metatarsophalangeal joint extending from each metatarsal to the distal end in the front-rear direction. A state where the lower sole portion of the region extending to the center of the bone is in contact with the sole portion, and the concave portion is positioned about 4 cm to 6 cm above the toe portion of the foot in the stance phase. In this case, the hypothesis having in-plane lines extending in the front-rear direction connecting the central portions of the proximal phalanges through the metatarsal joints from the distal ends of the metatarsals of the foot placed on the sole. A shoe characterized in that the surface is a recess having a shape that forms a substantially horizontal state.   The concave portion extends from the front portion of the first metatarsal in the width direction and the front portion of the first metatarsal in the front-rear direction to the central portion of the first proximal phalanx through the first metatarsal joint. A first concave portion with which a sole portion below the region abuts, and each front of the second metatarsal bone to the fifth metatarsal bone in the width direction from the second metatarsal to the fifth metatarsal and in the anteroposterior direction The lower sole part of the region in the region from the second metatarsal joint to the middle part of the fifth metatarsal joint through the second metatarsophalangeal joint to the fifth metatarsophalangeal joint extending from the tip to the distal end abuts. 2. The shoe according to claim 1, wherein the second recess having a shallower recess than the first recess is connected in the width direction of the sole.   The shoe according to claim 2, wherein at least the concave portion and the vicinity thereof of the sole are made of a material having a rubber hardness of about Hs 80 degrees. The shoe according to claim 2, wherein the shoe is a women's shoe, and the thickness from the bottom of the recess to the bottom of the sole is 8 mm or less.

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