JP4704437B2 - Shoe sole with midsole - Google Patents

Description

  The present invention relates to a shoe sole that contributes to smooth body center of gravity movement and quick turn.

Conventionally, there are known shoe soles provided with protrusions or bulges, and shoe soles having different hardness depending on the part.
JP 2004-337262 (Abstract) JP 2001-70004 (Abstract, FIGS. 1 and 2) JP 2002-282011 (Abstract) JP-A-10-295404 (summary) No. 5-40722 (Fig. 1) Japanese Utility Model Publication No. 64-39004 (Fig. 2) U. S. P. 6,041,521 (FIG. 1) JP-A-10-66604 (summary) JP 2002-159302 (Abstract) JP 2003-289903 (Abstract) Shoko Sho 62-27125 (Fig. 2)

Patent Documents 1 to 11 disclose a shoe sole provided with a protruding portion that protrudes upward or downward, and a shoe sole having different hardness depending on the part.
Patent Document 11 describes a characteristic foot behavior in various indoor competitions such as volleyball, basketball, badminton, table tennis, gymnastics, and aerobics, that is, repeated sudden turning and stopping. In order to prevent foot failure by averaging the inclination of the center of gravity when the foot moves to the outside during such specific foot behavior, the outer part of the foot is elastic with higher hardness than other parts A shoe sole having a midsole formed of a material is disclosed. However, this document does not describe any movement of the body center of gravity.

In general, in competitions such as badminton, when a ball is hit, the ball moves quickly to the point where the ball falls, and after the ball is hit, it moves quickly to the home position. Such an operation requires not only a quick movement of the center of gravity of the body to the front of the foot, but also a quick turn and a quick movement of the stepped foot to the original position (for example, a so-called pivot operation). For that purpose, it is necessary to quickly return the body center of gravity to the rear.
When stepping on or moving, the center of gravity of the body moves from the outside of the heel to the outside of the foot toward the position of the little ball of the front foot and the ball of the thumb. On the other hand, the turning operation until the body center of gravity is returned is performed by kicking the floor with the forefoot part and returning the body center of gravity backward.
Therefore, in order to quickly move the body center of gravity forward, it is important to smoothly move from the heel of the body center of gravity to the little ball and thumb ball. To quickly return the body center of gravity, the body center of gravity is moved. It is important to stop and turn quickly to kick the floor with the forefoot.

  The present invention has been made in view of this point, and an object of the present invention is to provide a shoe sole that enables smooth body center of gravity movement and quick turn.

  The shoe sole of the present invention includes an outer sole having a grounding surface that contacts the ground when landing, and a midsole that is disposed on the outer sole and relieves an impact at the time of landing. Provide an area. The first region includes a region immediately below the thumb ball, a region immediately below the head of the fifth metatarsal bone, a region immediately below the head of the fifth metatarsal bone, and a region immediately below the bone bottom of the fifth root phalanx. It is a region including at least one of the parts. The second region is a second region including a portion in front of the first region. The third region is a region including a rear portion of the foot outside the first region. The midsole hardness in the first region is in a first hardness range, the midsole hardness in the second region is in a second hardness range, and the midsole hardness in the third region is The hardness is in the third hardness range.

In order to enable smooth movement of the center of gravity of the body, in the present invention, the hardness within the third hardness range is greater than the hardness within the second hardness range, and is within the first hardness range. Is set larger than the hardness.
The body center of gravity first moves from the outside of the heel to the position of the little finger ball of the front foot through the outside of the foot.
Accordingly, in the present invention, since the midsole is set to be hard in the third region corresponding to the path (trajectory) along which the body center of gravity moves when stepping on, the midsole is relatively difficult to compress and deform in the third region. The time for the body center of gravity to move from the heel to the thumb ball can be shortened.

It should be noted that “the part directly under the thumb ball, the part directly under the head of the fifth metatarsal bone, the part immediately under the head of the fifth proximal phalanx, and the part immediately under the bone bottom of the fifth proximal phalanx. “A region including at least one of the above” means a region including two portions of the respective portions (the following (1) to (3)) and a region including three portions of the respective portions (the following (4) to (4) to (6)) or an area including all of the above-mentioned parts (the following (7)).
(1) A region (a region including two parts) including a part directly below the thumb ball and a part directly below the head of the fifth metatarsal bone (a part corresponding to the little ball)
(2) A region including a region directly below the thumb ball and a region immediately below the head of the fifth proximal phalanx (region including two regions)
(3) Region including the region directly below the thumb ball and the region immediately below the bone bottom of the fifth proximal phalanx (region including two regions)
(4) a region including a region directly below the thumb ball, a region immediately below the head of the fifth metatarsal bone, and a region directly below the head of the fifth metatarsal bone; (5) a region immediately below the thumb ball; A region including the region immediately below the bone head of the fifth metatarsal bone and the region immediately below the bone bottom of the fifth proximal phalanx. (6) a region immediately below the thumb ball, immediately below the bone head of the fifth proximal phalanx. A region including a region just below the bone bottom of the fifth proximal phalanx (7) a region directly below the thumb ball, a region directly below the head of the fifth metatarsal bone, and a head of the fifth proximal phalanx A region including a region immediately below and a region immediately below the bone bottom of the fifth proximal phalanx

  The phrase “the hardness of the midsole in the predetermined region is within the predetermined hardness range” includes a case where the hardness of the midsole is within the predetermined hardness range at any position in the predetermined region. In addition, when the hardness is locally small or large outside the predetermined hardness range (for example, when a hole is formed in the midsole or when a so-called gel is attached to the midsole) Including. Further, the midsole need not have a constant hardness in the predetermined region, and there may be a portion having a high hardness and a portion having a low hardness in the same region.

  In a preferred aspect of the present invention, the midsole is a region from the inside of the foot toward the third region behind the first region, and is directly below the bone body of the first to third metatarsals. A fourth region including a region, wherein the hardness of the midsole in the fourth region is within a fourth hardness range, and the hardness within the fourth hardness range is a hardness within the second hardness range. Larger than the first hardness range.

The center of gravity of the body moves toward the position of the little ball through the outside of the foot, and then moves from the outside of the foot toward the position of the inner thumb ball near the rear end of the front foot.
According to this aspect, since the midsole is set to be hard also in the fourth region corresponding to the movement path of the body center of gravity, the body center of gravity can be moved more smoothly. The fourth hardness range may be the same as the third hardness range.

  In a further preferred aspect of the present invention, the midsole further includes a fifth region extending from a portion rearward of the fourth region to the rear end of the heel on the inner side of the foot in addition to the fourth region. The midsole hardness in the fifth region is within a fifth hardness range, the hardness within the fifth hardness range is greater than the hardness within the first hardness range, and a third hardness It is set smaller than the hardness within the range.

  According to this aspect, since the fifth region having normal hardness is provided behind the fourth region on the inside of the foot, the body center of gravity is easily moved from the third region to the fourth region. . The fifth hardness range may be the same as the second hardness range. The hardness within the fifth hardness range may be smaller than the hardness within the fourth hardness range.

  As one structure for enabling the quick turn operation, in one aspect of the present invention, in a portion of the second region immediately below the bone body of the second proximal phalanx, the lower surface of the midsole is provided below. A raised surface projecting toward the surface is provided.

  The turn operation is performed by kicking the floor mainly by the first region (particularly the first to third fingers) after the movement of the center of gravity of the body. In this aspect, since the lower surface of the midsole protrudes downward at a site directly below the bone of the second proximal phalanx immediately before the first region, the body center of gravity moves quickly in the first region. Since it becomes easy to stop, the time from the movement of the center of gravity of the body to the operation of kicking the floor in the first region can be shortened. Therefore, the turn operation can be performed quickly. The bone body means a portion of the bone between the head (distal head) and the bone bottom (proximal head).

  In this aspect, it is preferable that the raised surface is provided so as to extend from inside to outside along the width direction of the foot. Thereby, the floor can be quickly kicked over substantially the entire area of the first region.

Further, in this aspect, the outer sole is preliminarily molded so that the upper surface of the outer sole has a curved surface along the raised surface, and the outer sole is substantially formed at a portion corresponding to the raised surface and portions before and after the raised surface. It is preferable that the specific thickness is set evenly. If the thickness of the hard outer sole is locally large, it is difficult to convey the feel to the soles. Moreover, adhesion between the upper surface of the outer sole and the raised surface of the midsole is facilitated.
The “substantial thickness of the outer sole” means the distance from the upper surface of the outer sole to the ground contact surface when the irregularities constituting the design are ignored.

  As another structure for achieving the quick turn operation, according to another aspect of the present invention, the hardness in the third hardness range is larger than the hardness in the second hardness range, and The hardness within the second hardness range is set to be larger than the hardness within the first hardness range.

  According to this aspect, since the midsole is set to be softer than the front and rear regions in the first region, the vicinity of the head of the fifth proximal phalanx and the thumb ball can easily sink downward. Therefore, it becomes easy to quickly stop the movement of the body center of gravity in the first region, so that it is possible to shorten the time from the movement of the body center of gravity to the operation of kicking the floor in the first region. Therefore, the turn operation can be performed quickly.

  In addition to the setting of the first hardness range, a downwardly raised surface may be provided on the lower surface of the midsole in the first region. In this way, the turn operation can be made even faster.

  The first hardness range is 40 degrees or more and less than 50 degrees in terms of JISC hardness, and the second hardness range is 50 degrees or more and 60 degrees or more in terms of JISC hardness from the viewpoint of smooth movement of the center of gravity and quick turn operation. The third hardness range is preferably 60 degrees or more and less than 70 degrees in terms of JISC hardness.

  From the same viewpoint, the main hardness of the midsole in the second region is 5 to 15 degrees greater in JISC hardness than the main hardness of the midsole in the first region, and the midsole in the third region is The main hardness is preferably 5 to 15 degrees greater in JISC hardness than the main hardness of the midsole in the second region.

  In addition, “the main hardness of the midsole” in each region means that the hardness is constant when the hardness is constant at any position in each region, and the hardness varies depending on the position in each region. Means the most distributed hardness in the region.

It is a top view which shows pivot operation | movement of a leg | foot. 2A is a perspective view showing the motion of the foot in the first motion, and FIG. 2B is a perspective view showing the motion of the foot in the fifth motion. FIG. 3A is a skeleton diagram showing the position of the center of gravity of the body at each time point in the first motion, and FIG. 3B is a graph showing changes in floor reaction force. 4A is a skeleton diagram showing the position of the center of gravity of the body at each time point in the fifth motion, and FIG. 4B is a graph showing changes in the floor reaction force. It is a bottom view of the mid sole concerning the 1st example of the present invention. FIG. 6A is a longitudinal sectional view of the midsole, and FIG. 6B is a longitudinal sectional view of an outer sole (front foot). 7A is a sectional view taken along line VIIa-VIIa in FIG. 4, FIG. 7B is a sectional view taken along line VIIb-VIIb in FIG. 4, and FIG. 7C is a sectional view taken along line VIIc-VIIc in FIG. It is a bottom view which shows the relationship between a mid sole and a leg bone. It is an inside view which shows the relationship between a midsole and a leg bone. It is an outer side view which shows the relationship between a mid sole and a leg bone. It is a bottom view of an outer sole. It is a bottom view of the midsole concerning 2nd Example of this invention. 13A is an inner side view of the midsole, FIG. 13B is an outer side view of the midsole, and C is a longitudinal sectional view of the midsole. FIG. 14A is a graph showing a verification result for smooth body centroid movement in the first motion, and FIG. 14B is a graph showing a verification result for the same quick turn operation. FIG. 15A is a graph showing a verification result for smooth body centroid movement in the fifth motion, and FIG. 15B is a graph showing a verification result for the same quick turn operation.

Explanation of symbols

1: Midsole 15: Raised surface 2: Outer sole 21: Grounding surface 25, 26: Groove 22: Upper surface R1: First region R2: Second region R3: Third region R4: Fourth region R5: Fifth region 72b: second proximal phalanx 75a: fifth proximal phalanx 75c: fifth proximal phalanx 81a: thumb ball 81b: first metatarsal bone 82b: second metatarsal Bone and bone body 83b: Third metatarsal bone body 85a: Fifth metatarsal bone head (small finger ball)
X: Foot width direction Y: Foot length direction

  The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and figures are for illustration and description only and should not be used to define the scope of the present invention. The scope of the invention is defined solely by the appended claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

Stepping and turning actions :
Prior to the description of the embodiments of the present invention, a stepping operation and a turning operation which are the premise of the present invention will be described first.
For example, in competitions such as badminton and squash, the player frequently moves from the home position to the ball drop point and returns to the home position again. It can be considered that such an operation can be considered by approximately replacing it with an operation of returning the foot to the original position (home position) after changing the posture by stepping on the foot by the pivot operation.

  In the pivot operation shown in FIG. 1, after the right foot is moved from the position M0 to any one of the positions M1 to M7 with the left foot as an axis, an operation of returning the moved right foot is performed. In the movement to each position M1 to M7 (motion 1 to 7), the floor reaction force from landing to turn operation, its distribution, the position of the body center of gravity, etc. were examined. The results were almost the same except for the movement to the position M5. was gotten. Hereinafter, the movement to the position M1 (motion 1) and the movement to the position M5 (motion 5) will be described separately, and description of other motions will be omitted.

In motion 1, the right foot shows a series of behaviors (a) to (f) in FIG. 2A. That is, (a) Landing at the rear end of the heel, (b) to (c) bending the knee and grounding the entire surface of the sole, (d) slightly raising the heel, (e) to (f) shoes again A series of operations is performed in which almost the entire bottom surface is grounded. In the state (a), that is, at the time point t0, the position of G _t0 (the rear end of the rib 91) in FIG. In the state (b), that is, at the time point t1, the position of G _t1 (the center of the rib 91) in FIG. 3A is the position of the center of gravity of the body, and in the state (d), that is, at the time point t2, FIG. G _t2 (the head of the third metatarsal 81) is the position of the center of gravity of the body, and in the state (e), that is, at the time t3, the position of G _t3 in FIG. 3A (the center of the talar 92) is It is the position of the body center of gravity.
That is, the position of the body center of gravity moves forward in the period from time t1 to time t2, and the position of the moved body center of gravity returns to the rear again in the period from time t2 to time t3 (turn operation).

  The change in the floor reaction force at the time t0 to t3 of the motion 1 is shown in the graph of FIG. 3B. Fy represents the floor reaction force in the kicking direction, and Fz represents the floor reaction force in the vertical direction. As can be seen from this graph, the floor reaction force has a peak value at each time point t0 to t3.

On the other hand, in motion 5, the right foot shows a series of behaviors (a) to (e) in FIG. 2B. That is, (a) to (b) landing at the rear end of the heel, (c) the entire surface of the sole is grounded, and the position of the center of gravity of the body moves forward from the heel, (d) the knee is bent and the whole body (E) A series of operations of returning the body to the rear is performed. The positions of the center of gravity of the body at the time points _{t0 to t3} of the motion 5 are as indicated by G _{t0 to} G _t3 in FIG. 4A, respectively. Further, the change in the floor reaction force in the motion 5 is shown in the graph of FIG. 4B.

The difference from the motion 1 is that the time required for a series of motion 5 motions is shorter than that of motion 1 and that the floor reaction force does not change from time t2 to time t3. The position G _t1 weight center point t1 motion 5 is toward the widthwise center of the foot than that in the motion 1.

  In order to quickly return both of the motions after stepping on the foot, the time t1 to the time t2, that is, the time ΔT1 required to move the body center of gravity is shortened, or the time t2 to the time t3, It is important to shorten the time ΔT2 required for the turn operation.

First embodiment:
Hereinafter, the first embodiment will be described with reference to FIGS.
The shoe sole of this embodiment includes a midsole 1 shown in FIG. 5 and an outer sole 2 (FIG. 11) bonded to the lower surface of the midsole 1.

The midsole 1 is formed of a material suitable for shock absorption such as a foamed resin such as EVA (ethylene-vinyl acetate copolymer). The midsole 1 is divided into first to fifth regions R1 to R5, and the hardness of the midsole 1 in each region R1 to R5 is set to a predetermined range.
In FIG. 5, in order to make the hardness distribution in each region R1 to R5 easier to understand, a plurality of types of shading are applied, and the same type of shading shows the same range of hardness (the same applies to FIG. 12 described later). . In the following drawings, IN indicates the inside of the foot, and OUT indicates the outside of the foot.

  As shown in FIGS. 5 and 8, the first region R1 includes a region just below the thumb ball (first metatarsal bone head) 81a, a region directly below the fifth proximal phalanx head 75a, and a fifth proximal segment. It includes a portion directly below the bone body 75b and a portion directly below the fifth proximal phalanx bottom 75c. The first region R1 extends in a belt shape from the inner side of the foot to the outer side of the foot substantially along the foot width direction X. The first region R1 is formed of, for example, an EVA foam having a higher resilience than that normally used for a midsole, and its hardness is set to about 45 degrees in terms of JISC hardness.

  The first region R <b> 1 may include a portion immediately below the fifth metatarsal bone head (little finger ball) 85 a, or may be provided in an arc shape so as to substantially follow the MP joint 79. The first region R1 is not necessarily provided continuously from the inside to the outside of the foot, and may be provided in an island shape by being separated into the inside and the outside of the foot.

  The second region R2 is a region extending from the portion immediately before the first region to the toe. The second region R2 is formed of, for example, an EVA foam that is normally used for a midsole. The hardness is set to about 55 degrees as JISC hardness, and is larger than the hardness of the midsole 1 in the first region R1.

  The third region R3 is located along the foot length direction Y from a portion in the vicinity of the fifth metatarsal bone body 85b immediately after the first region R1, slightly outside the center line HC of the foot. It is a part extending to the inside of the bone 91. The third region R3 is formed of, for example, an EVA foam having higher hardness than that normally used for a midsole. The hardness is set to about 65 degrees as JISC hardness, which is higher than the hardness of the midsole 1 in the first and second regions R1, R2.

The fourth region R4 is a substantially fan-shaped or substantially triangular-shaped region in plan view from the inner side of the foot toward the center line HC of the foot behind the first region R1. The fourth region R4 extends from the first to third metatarsal bone bodies 81b, 82b, 83b to the Chopard joint 89 of the first to third fingers inside the third region R3. The material and hardness of the fourth region R4 are the same as those of the third region R3.
The fourth region R4 does not necessarily have a substantially fan shape or a substantially triangular shape, and is provided in a band shape along the first to third metatarsal bone bodies 81b, 82b, 83b in front of the Chopard joint 89. May be. In this embodiment, the fourth region R4 is continuous with the third region R3.

The fifth region R5 is a region extending from a position immediately after the fourth region to a rear end of the bag. The material and hardness of the fifth region R5 are the same as those of the second region R2.
The second region R2 and the fifth region R5 are formed of EVA foam having a general hardness generally used for a midsole. These regions do not need to be softened as in the first region R1 or hard as in the third region R3. Rather, they are hardened or softened to inhibit the movement of the foot or This is because the support may become unstable.

  A shank 51 is attached to the lower surface of the midsole 1 to prevent twisting and bending of the midfoot.

  Thus, in this embodiment, the hardness of the midsole 1 in the third and fourth regions R3, R4 is set to be greater than that in the other regions R1, R2, R5. The third and fourth regions R3 and R4 correspond to the path of the body center of gravity during the above-described stepping motion. Since the midsole 1 is difficult to compress and deform along the path of the body center of gravity, the time (the above-described ΔT1) for the body center of gravity to move from the heel toward the thumb ball can be shortened.

  The hardness of the midsole 1 in the first region R1 is set to be smaller than that in the regions R2 to R4 before and after the midsole 1. Therefore, a part where the floor starts to return to the center of gravity by kicking the floor, that is, a part extending from the thumb ball to the little finger ball is likely to sink downward. Since it becomes easy to quickly stop the movement of the body center of gravity at an appropriate position, the time required for the turn operation of kicking the floor (the aforementioned ΔT2) can be shortened.

  In this embodiment, each of the regions R1 to R5 of the midsole 1 is formed of one kind of material, but each region R1 to R1 of the midsole 1 is overlapped by overlapping a plurality of types of materials. R5 may be formed. For example, one foamed resin layer having a general hardness and covering all the regions R1 to R5 and having recesses in the first region R1, the third region R3, and the fourth region R4 is prepared. By overlapping another soft foam resin layer in the recess of the first region R1, and overlapping another hard resin foam layer in the recesses of the third region R3 and the fourth region R4, the hardness as described above A midsole having a distribution may be realized.

As shown in the longitudinal sectional view of FIG. 6A, a raised surface 15 that protrudes downward is provided on the lower surface 11 of the midsole 1 in the second region R2.
The raised surface 15 is formed in a curved shape that changes substantially smoothly in the longitudinal section, and the thickness of the midsole 1 in the portion of the second region R2 where the raised surface 15 is formed is the midpoint in the first region R1. It is set larger than the thickness of the sole 1.

The maximum height of the raised surface (projection height H at the most projecting point) is set to about 3 mm. The relationship between the foot bone and the raised surface 15 of the midsole 1 in a side view is as shown in FIGS. 9 and 10.
This raised surface extends in the range from the position indicated by the two-dot chain line in FIG. 8 to the toe, and this range includes the first to third proximal phalanx bodies 71b immediately before the first region R1, The site directly below 72b and 73b is included.

  Since the raised surface 15 is provided immediately in front of the first region R1, the movement of the body center of gravity is easily stopped in the first region R1, and it is necessary for the turn operation of kicking the floor in the first region R1. The time (ΔT2 described above) can be shortened.

  As shown in FIGS. 7A and 7B, in the second region R2 and the first region R1, the midsole 1 is provided with a winding portion 16 that winds upward only on the outside of the foot. On the other hand, as shown to FIG. 7C, in 3rd area | region R3 and 4th area | region R4, the winding part 16 is provided in both the inner side and the outer side of the midsole 1. These upper portions 16 serve to stably support the foot when the body center of gravity moves.

  As shown in FIG. 6B, the outer sole 2 has a grounding surface 21 and an upper surface 22. A concave surface 22 a that is recessed along the raised surface 15 of the midsole 1 is provided on the upper surface 22 of the outer sole 2. A bulge surface 21 a that bulges downward is provided on the ground contact surface 21 of the outer sole 2 at a portion directly below the concave surface 22 a. The substantial thickness of the outer sole 2 is set to be equal in the part corresponding to the raised surface 15 and the part before and after the part.

As shown in FIG. 11, the ground contact surface 21 of the outer sole 2 is formed with ten or more grooves 25 extending along the foot width direction X at a portion corresponding to the third region R3 (FIG. 5). ing. Thereby, in 3rd area | region R3, the grip force at the time of the outer sole 2 moving to the front-back direction along a foot length direction increases.
Further, a plurality of concentric grooves 26 are formed on the ground contact surface 21 of the outer sole 2 at a portion corresponding to the thumb ball 81a (FIG. 8). This makes it easy to kick the floor in all directions with the thumb ball 81a and facilitates movement in all directions.

Second embodiment:
12 and 13A to 13C show a second embodiment.
As shown in FIGS. 13A to 13C, in this embodiment, the raised portion of the midsole 1 is not provided at the distal end portion of the second region R2. That is, the raised portion 15 is provided only in the range between the two two-dot chain lines in FIG. 12 in the second region R2.
Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same or corresponding portions, and detailed description and illustration thereof are omitted.

Comparative examples and test examples :
Hereinafter, in order to clarify the effects of the present invention, tests using Comparative Examples 1 to 3 and Test Examples 1 to 4 will be described.

  As Comparative Examples 1 to 3, three pairs of commercially available badminton shoes with different manufacturers were prepared.

  As Test Example 1, a shoe employing the midsole 1 having the hardness distribution and the raised surface shown in the examples of FIGS. 12 and 13A to 13C was produced. As the material of the midsole 1, EVA foam was used. However, the outer sole 2 having a flat upper surface was bonded to the midsole 1. The maximum height H of the raised surface 15 of the midsole 1 was set to 3 mm. As the material of the first region R1, an EVA foam having higher resilience than the other regions R2 to R5 was used.

  As Test Example 2, a shoe having the same structure as Test Example 1 was produced except that the maximum height H of the raised surface 15 of the midsole 1 was 5 mm.

  As Test Example 3, a shoe having the same structure as Test Example 1 was produced except that the first region R1 was EVA having the same resilience as the other regions R2 to R5.

  As Test Example 4, a shoe having the same structure as Test Example 3 was produced except that the maximum height H of the raised surface 15 of the midsole 1 was 5 mm.

Test method;
The same subject wears the shoes of Comparative Examples 1 to 3 and Test Examples 1 to 4, performs the motion 1 and motion 5 of FIGS. 1 to 2B, and measures the floor reaction force of FIGS. 3B and 4B. However, time points t1 to t3 were measured. The time required from time t1 to t2 (time required to move the body center of gravity forward) ΔT1 and the time required from time t2 to t3 (time required for turn operation) ΔT2 are calculated. It was done. The results are shown in FIGS. 14A, 14B, 15A, and 15B.

As can be seen from the chart of FIG. 14A, in Motion 1, the cases of Test Examples 1 to 4 are approximately 0.07 seconds to 1 second, compared to Comparative Examples 1 to 3, which is necessary for the forward movement of the body center of gravity. The time (movement time of the body center of gravity) ΔT1 was significantly shortened.
The reason why the movement time ΔT1 of the body center of gravity is thus greatly shortened is that the midsole 1 in the third region R3 corresponding to the movement path of the body center of gravity has a large hardness, so that the force of the sole is transmitted to the floor quickly. Guessed.

As can be seen from the chart of FIG. 15A, in the motion 5, the movement time ΔT1 of the body center of gravity is slightly shortened in the cases of the test examples 1 to 4 compared to the comparative examples 1 to 3.
As described above, the reason why the movement time ΔT1 of the body center of gravity is slightly shortened in the motion 5 is that the position G of the body center of gravity moves forward almost through the center of the foot as shown in FIG. 4A. It is presumed that this is because the effect of setting the hardness of the midsole 1 slightly is exhibited.

  During the competition, the motion of motion 5 is relatively small, and the overall movement of motion 1 to 4, 6, 7 is the main, so the shoe sole of this test example speeds up the operation during the competition. It is understood that it can fully contribute to

As can be seen from the charts of FIG. 14B and FIG. 15B, in both the motions 1 and 5, the time required for the turn operation (turn operation time) ΔT2 in the cases of Test Examples 1 to 4 is larger than that in Comparative Examples 1 to 3. Shortened.
Thus, it is estimated that one of the factors that shortened the time ΔT2 is that the raised surface 15 is provided on the midsole 1.

  In both motions 1 and 5 in the charts of FIGS. 14B and 15B, the turn operation time ΔT2 is shorter in the cases of Test Examples 1 and 2 than in the cases of Test Examples 3 and 4. In Test Examples 1 and 2, the cause is that not only the raised surface 15 is provided on the midsole 1, but also the hardness of the midsole 1 in the first region R1 is in the second and third regions R2 and R3. It is estimated that it is smaller than that.

In Test Examples 1 and 2, since there was no significant difference in turn operation time ΔT2, there was almost no difference in effect regardless of whether the maximum height H of the raised surface 15 was 5 mm or 3 mm.
It is estimated that the maximum height H of the raised surface 15 is preferably within a predetermined range. In consideration of the function of shortening the turn operation time ΔT2, the lower limit of the maximum height H is preferably about 1.0 mm, and more preferably about 1.5 mm. . In consideration of stably supporting the foot, the upper limit value of the maximum height H is preferably about 6.0 mm, more preferably about 5.0 mm, and about 4.0 mm. Is presumed to be most preferable.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the midsole hardness in the fourth region may be set to be the same as that in the fifth region. Further, the raised portion of the midsole may be provided only in a part of a portion extending from the inside to the outside of the foot, or may be provided intermittently from the inside to the outside of the foot.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention.

  The present invention can be applied to various sports shoes such as badminton shoes.

Claims (14)

In a shoe sole comprising an outer sole having a ground contact surface to be grounded at the time of landing, and a midsole disposed on the outer sole to alleviate an impact at the time of landing,
The midsole is:
At least one of a site just below the thumb ball, a site just below the head of the fifth metatarsal bone, a site just below the head of the fifth proximal phalanx, and a site just below the bone bottom of the fifth proximal phalanx; A first region comprising:
A second region including a portion in front of the first region;
A third region including a portion rearward of the first region on the outside of the foot; and
The midsole hardness in the first region is within a first hardness range;
The midsole hardness in the second region is within a second hardness range;
The midsole hardness in the third region is within a third hardness range;
A shoe sole in which the hardness within the third hardness range is greater than the hardness within the second hardness range, and the hardness within the second hardness range is greater than the hardness within the first hardness range. 2. The midsole according to claim 1, wherein the midsole is a region from the inner side of the foot toward the third region behind the first region, and a region directly below the bone body of the first to third metatarsals. A fourth region including:
The midsole hardness in the fourth region is within a fourth hardness range;
A shoe sole in which the hardness in the fourth hardness range is greater than the hardness in the second hardness range. The midsole according to claim 2, further comprising a fifth region extending from a rear portion of the foot to a rear end of the heel on the inner side of the foot.
The midsole hardness in the fifth region is within a fifth hardness range;
A shoe sole having a hardness within the fifth hardness range that is greater than a hardness within the first hardness range and less than a hardness within the third hardness range.   The first hardness range according to claim 1 or 3, wherein the first hardness range is 40 degrees or more and less than 50 degrees in JISC hardness, the second hardness range is 50 degrees or more and less than 60 degrees in JISC hardness, and the third hardness The range is a shoe sole with a JISC hardness of 60 degrees to less than 70 degrees.   The main hardness of the midsole in the second region according to claim 1 or 3 is 5 to 15 degrees greater in JISC hardness than the main hardness of the midsole in the first region, and the midsole in the third region. The sole of the sole has a JISC hardness of 5 to 15 degrees greater than the main hardness of the midsole in the second region. In a shoe sole comprising an outer sole having a ground contact surface to be grounded at the time of landing, and a midsole disposed on the outer sole to alleviate an impact at the time of landing,
The midsole is:
At least one of a site just below the thumb ball, a site just below the head of the fifth metatarsal bone, a site just below the head of the fifth proximal phalanx, and a site just below the bone bottom of the fifth proximal phalanx; A first region comprising:
A second region including a portion in front of the first region;
A third region including a portion rearward of the first region on the outside of the foot; and
The midsole hardness in the first region is within a first hardness range;
The midsole hardness in the second region is within a second hardness range;
The midsole hardness in the third region is within a third hardness range;
The hardness within the third hardness range is greater than the hardness within the second hardness range and greater than the hardness within the first hardness range;
A shoe sole in which a raised surface that protrudes downward is provided on a lower surface of the midsole in a portion of the second region just below the bone body of the second proximal phalanx.   The shoe sole according to claim 6, wherein the thickness of the midsole in the portion of the second region where the raised surface is formed is greater than the thickness of the midsole in the first region.   The shoe sole according to claim 6, wherein the raised surface is provided so as to extend from the inside to the outside along the width direction of the foot. In Claim 8, the outer sole has an upper surface opposite to the ground contact surface, the outer sole is pre-shaped so that the upper surface of the outer sole has a curved surface along the raised surface,
A shoe sole in which a substantial thickness of the outer sole is uniformly set in a portion corresponding to the raised surface and a portion before and after the portion. In claim 6,
A shoe sole in which the hardness within the second hardness range is greater than the hardness within the first hardness range. The midsole according to claim 10, wherein the midsole is a region from the inner side of the foot toward the third region behind the first region, and the region directly below the bone body of the first to third metatarsals. A fourth region including:
The midsole hardness in the fourth region is within a fourth hardness range;
A shoe sole in which the hardness in the fourth hardness range is greater than the hardness in the second hardness range. The midsole according to claim 11, further comprising a fifth region extending from a portion rearward of the fourth region to a rear end of the heel on the inner side of the foot,
The midsole hardness in the fifth region is within a fifth hardness range;
A shoe sole having a hardness within the fifth hardness range that is greater than a hardness within the first hardness range and less than a hardness within the third hardness range. In a shoe sole comprising an outer sole having a ground contact surface to be grounded at the time of landing, and a midsole that is disposed on the outer sole and cushions an impact at the time of landing,
The midsole is:
At least one of a site just below the thumb ball, a site just below the head of the fifth metatarsal bone, a site just below the head of the fifth proximal phalanx, and a site just below the bone bottom of the fifth proximal phalanx; A first region comprising:
A second region including a portion in front of the first region;
A third region including a portion rearward of the first region on the outside of the foot; and
A raised surface that protrudes downward is provided on the lower surface of the midsole at a site directly below the bone of the second proximal phalanx in the second region,
The thickness of the midsole in the portion of the second region where the raised surface is formed is greater than the thickness of the midsole in the first region,
The raised surface is a shoe sole provided so as to extend from the inside to the outside along the width direction of the foot. In Claim 1, 6 or 13, in a portion corresponding to the third region, 10 or more grooves extending along the width direction of the foot are formed on the ground contact surface of the outer sole,
A shoe sole in which a plurality of concentric grooves are formed on a ground contact surface of the outer sole at a portion immediately below the thumb ball.