JP2005095388A - shoes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sports shoe capable of reducing a wearer's feeling of fatigue while ensuring running stability.
SOLUTION: Sports shoes include an upper part including a part covering the instep of the wearer's foot to a buttock, a shoe bottom part for receiving the wearer's foot between the upper part, The foot 6 includes a reinforcing belt 8 as a reinforcing member, and the reinforcing belt 8 is at an angle of 30 ° or more and 60 ° or more with respect to the shoe center line 1C from the inner shell side to the outer shell side toward the toe. The belt is installed to extend, and the tensile rigidity of the belt is larger than the compression rigidity.
[Selection] Figure 2

Description

  The present invention relates to a shoe, and more particularly to a shoe characterized by torsional rigidity.

  For example, shoes used in various sports generally have an upper part (cover part) including a part covering the instep of the wearer to the buttocks, and a shoe bottom part. The shoe sole has a midsole and an outsole that is bonded to the lower surface of the shoe sole and is in direct contact with the road surface.

  As an example of such shoes, what was described in Unexamined-Japanese-Patent No. 2002-262903 (conventional example 1) etc. are mentioned, for example.

In Conventional Example 1, the shank part formed on the arch part creates a prosthetic movement axis of the forefoot part on the sole, creating deformation and twisting of the shoe sole around this rotation axis, and the forefoot part is naturally A shoe that can perform various walking exercises (pronation exercises) is disclosed.
JP 2002-262903 A

  However, the above shoes have the following problems.

  In general, increasing the torsional rigidity of a shoe improves running stability, but the movement of the wearer's foot is hindered, so the wearer feels tired. Conversely, if the torsional rigidity is reduced, the wearer's feeling of fatigue is suppressed, but the running stability decreases. Therefore, it is necessary to optimize the torsional rigidity in order to suppress fatigue of the wearer while improving running stability.

  Here, paying attention to the directions of twisting (forefoot pronation direction and forefoot prolapse direction), the forefoot pronation direction (fixing the buttocks and the shoe sole of the forefoot toward the side away from the midline of the body) Direction torsional rigidity affects running stability, and torsional rigidity of the front foot (the direction in which the sole of the forefoot heads toward the midline of the body with the buttocks fixed) affects fatigue. To do. Therefore, while improving torsional rigidity in the forefoot pronation direction, while ensuring ease of twisting in the forefoot pronation direction, it suppresses wearer fatigue while improving the running stability of the shoes. Can do.

  However, the conventional example 1 does not disclose the idea of making the torsional rigidity of the forefoot part greater than the torsional rigidity of the forefoot part, and from the viewpoint described above, the torsional rigidity is large. It cannot be optimized.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a shoe capable of suppressing a wearer's feeling of fatigue while improving running stability. .

  In one aspect of the shoe according to the present invention, the torsional rigidity in the forefoot pronation direction is greater than the torsional rigidity in the forefoot pronation direction.

  In the present invention, torsion in the forefoot pronation direction and forefoot pronation direction means torsion around the center line of the shoe sole, and means the direction in which the forefoot part pronounces and unrotates with respect to the heel. .

  In other words, in the present invention, the forefoot pronation direction means a direction in which the heel is fixed and the shoe sole of the forefoot is away from the midline of the body, and the forefoot pronation direction is , Meaning the direction in which the heel is fixed and the sole of the forefoot is directed toward the midline of the body.

  With the above configuration, the wearer's feeling of fatigue can be suppressed while improving running stability in the shoe.

  The ratio of the torsional rigidity in the forefoot pronation direction to the torsional rigidity in the forefoot pronation direction is preferably greater than 1 and about 2 or less.

  Further, the torsional rigidity in the forefoot gyrus direction is about 0.05 (N · m / deg) or more, and the torsional rigidity in the forefoot gyrus direction is about 0.8 (N · m / deg) or less. Is preferred.

  By setting the ratio of the torsional rigidity and the absolute value of the torsional rigidity of the forefoot portion in the pronation and supination directions, the torsional rigidity of the shoe can be optimized within a more appropriate range.

  In another aspect, a shoe according to the present invention includes an upper part, a shoe bottom part that receives a wearer's foot between the upper part, and a reinforcement part at a middle foot part of the shoe sole part. , Extending from the inner shell side toward the outer shell side toward the toe with respect to the shoe mold center line, and the tensile rigidity is larger than the compression rigidity.

  Here, the middle foot portion means a range in which the distance from the rear end of the shoe heel is about 0.2 times or more and 0.65 times or less the total length of the shoe. The tensile and compressive rigidity means a value obtained by dividing the tensile and compressive force (N) acting on the member by the strain (ε) when the force is applied (that is, N / ε). It becomes an index indicating the difficulty of extension and the difficulty of contraction.

  With the configuration described above, it is possible to ensure the ease of twisting in the forefoot gyrus direction while increasing the rigidity of the shoe against twisting in the forefoot gyrus direction. As a result, the wearer's feeling of fatigue can be suppressed while improving the running stability of the shoe.

  The reinforcing portion is a band-shaped member, and the inclination angle of the band-shaped member with respect to the shoe-shaped center line is preferably about 30 ° to 60 °.

  Here, the shoe-shaped center line means a straight line that connects directly below the second metatarsal head of the wearer's foot and directly below the last part of the heel.

  By installing the reinforcing portion at the above angle, the torsional rigidity in the forefoot pronation direction can be efficiently improved.

  The sole includes a midsole joined to the lower part of the upper part and an outsole joined to the lower surface of the midsole and in direct contact with the road surface. In one aspect, the reinforcing part is provided with a reinforcing part on the midsole. In another aspect, the member may be provided on the outsole.

  Thereby, the effect mentioned above can be acquired also in any situation.

  In the above shoes, the shoe further includes another reinforcing portion that extends from the outer side toward the inner side toward the toe relative to the shoe type center line with respect to the shoe type center line. You may employ | adopt the structure that it is larger than the tensile rigidity of a part.

  Also in this structure, the rigidity of the reinforcing part with respect to torsion in the forefoot pronation direction can be made larger than the rigidity of the member with respect to torsion in the forefoot pronation direction.

  The reinforcing part is made of carbon fiber, Kevlar fiber, aramid fiber, polyester fiber, glass fiber, or woven fabric thereof, rubber, urethane foam, urethane, EVA (Ethylene-Vinyl Acetate copolymer), nylon, It is preferable to include at least one material selected from the group consisting of foamed rubber.

  Thereby, a reinforcement part can be formed in a lightweight.

  ADVANTAGE OF THE INVENTION According to this invention, a wearer's fatigue feeling can be suppressed, improving the running stability of shoes.

  In the following, an embodiment of a shoe according to the present invention will be described.

  In the shoe according to the present embodiment, the torsional rigidity in the forefoot pronation direction is larger than the torsional rigidity in the forefoot pronation direction.

  In conventional shoes, running stability is improved by increasing the torsional rigidity of the shoes, but the wearer's feeling of fatigue is increased, or by reducing the torsional rigidity, the feeling of fatigue of the wearer is suppressed. However, there was a problem that running stability was lowered. On the other hand, in the shoe according to the present embodiment, the wearer can ensure the twistability in the forefoot rotation direction while improving the running stability of the shoe by the torsional rigidity in the forefoot rotation direction. The fatigue feeling can be suppressed.

  Here, for example, when the torsional rigidity in the forefoot pronation direction is extremely large, or when the torsional rigidity in the forefoot pronation direction is extremely small, the wearer is concerned with the running stability of the shoe or the feeling of fatigue during running. May not be satisfied.

  Therefore, the ratio of the torsional rigidity in the forefoot pronation direction to the torsional rigidity in the forefoot pronation direction is preferably greater than 1 and about 2 or less (more preferably about 1.2 or more and 1.6 or less).

  Further, the torsional rigidity in the forefoot gyrus direction is about 0.05 (N · m / deg) or more, and the torsional rigidity in the forefoot gyrus direction is about 0.8 (N · m / deg) or less (more preferably). The torsional rigidity in the forefoot gyrus direction is about 0.1 (N · m / deg) or more, and the torsional rigidity in the forefoot gyrus direction is about 0.4 (N · m / deg) or less) Is preferred.

  By setting the ratio of the torsional rigidity and the absolute value of the torsional rigidity of the prosthetic part in the pronation and supination directions, the wearer is satisfied with respect to both the running stability of the shoes and the wearer's fatigue. The torsional rigidity of the shoe can be optimized as long as it can.

  As shoes which implement | achieved said structure, the following can be considered, for example. That is, the shoe according to the present embodiment includes an upper part, a shoe bottom part that receives the foot of the wearer between the upper part, and a reinforcing part at a middle foot part of the shoe sole part. It extends from the inner shell side toward the outer shell side toward the toe with respect to the shoe mold center line, and the tensile rigidity is larger than the compression rigidity.

  In addition, the shoe sole part is formed including a midsole joined to the lower part of the upper part and an outsole joined to the lower surface of the midsole and in direct contact with the road surface. Further, an insole is provided on the midsole, and an insole portion that is in contact with the wearer's foot is provided on the insole.

  The reinforcing part may be formed integrally with each member constituting the shoe sole part, or may be a reinforcing member formed separately. Further, the reinforcing portion may be provided on the midsole or on the outsole. In other words, the reinforcing portion may be attached to the midsole or the outsole of the portion exposed on the bottom surface, or the reinforcing portion may be sandwiched between the midsole and the outsole. The midsole may be divided into an upper midsole and a lower midsole, and a reinforcing part may be sandwiched between the upper and lower midsole.

  Further, the reinforcing portion may be provided between the midsole and the insole, or between the insole and the insole portion, or may be provided on the insole portion.

  Moreover, the reinforcement part may be arrange | positioned over the middle leg part full length, and may be arrange | positioned only in the part.

  In the above configuration, when the shoe is twisted in the forefoot pronation direction, a tensile stress is generated in the reinforcement portion, and when the shoe is twisted in the forefoot rotation direction, a compression stress is generated in the reinforcement portion. Here, since the tensile rigidity of the reinforcing part is larger than the compression rigidity, the rigidity of the reinforcing part with respect to torsion in the forefoot rotation direction is larger than the rigidity of the member with respect to torsion in the forefoot rotation direction. As a result, the torsional rigidity in the forefoot pronation direction of the shoe is greater than the torsional rigidity in the forefoot pronation direction.

  The reinforcing portion is a band-shaped member, and the inclination angle of the band-shaped member with respect to the shoe-shaped center line is preferably about 30 ° to 60 ° (more preferably about 40 ° to 50 °).

  When the inclination angle of the belt-like member is extremely large or small, the belt-like member mainly serves as a reinforcement against bending and hardly contributes to an increase in torsional rigidity. On the other hand, by setting the inclination angle within the above range, the torsional rigidity in the forefoot pronation direction can be improved efficiently.

  The shape of the belt-like member may be a substantially rectangular shape, but for example, the same effect as described above can be obtained when any polygon is connected side by side in a belt shape, or is curved in an S shape. It should be understood that it is included in the belt-shaped member as long as

  In addition, the main surface of the belt-like member may have a planar shape, or may have an uneven shape such as a corrugated shape.

  The above shoes further include a cross reinforcing portion (another reinforcing portion) extending from the outer side toward the inner side toward the toe with respect to the shoe mold center line, and the tensile rigidity of the reinforcing portion is the tensile strength of the cross reinforcing portion. You may employ | adopt the structure of being larger than rigidity. Also in this structure, the same effect as the above-described configuration can be obtained.

  Since other matters relating to the cross reinforcing portion are the same as those of the reinforcing portion described above, the description thereof is omitted here.

  In addition, as an example of the material used for a reinforcement part (a cross reinforcement part is included), fibers, such as carbon fiber, Kevlar fiber, aramid fiber, polyester fiber, glass fiber, or those textiles, and those, for example, rubber, foam Examples include urethane, urethane, EVA, nylon (including PAE (Polyamide Elastomer)), polymer materials such as foamed rubber, and materials including these.

  By using these materials, the reinforcing portion can be formed with a light weight. Further, when the above polymer material is used, there is an advantage that it is easy to process.

  In addition, as a thing containing a fiber, using fiber reinforced resin etc. can be considered, for example. Moreover, as a fiber, a woven fabric may be used and a nonwoven fabric may be used.

  Below, Example 1 of the shoes based on this invention is demonstrated using FIGS. 1-3.

  FIG. 1 is a view showing a side surface of a shoe 1 according to the present embodiment. FIG. 2 is a view showing the bottom surface of the shoe 1. 1 and 2, the right foot of the shoe 1 is shown. That is, FIG. 1 is a view of the right foot of the shoe 1 as seen from the outer side, and FIG. 2 is a view of the right foot of the shoe 1 as seen from the bottom side.

  As shown in FIG. 1, the shoe 1 includes an upper portion 2 and a shoe bottom portion 2A, and the upper portion 2 includes a portion from a portion covering the instep of the wearer to a heel portion, It has a midsole 3 and an outsole 4. The shoes 1 are classified into a front foot portion 5, a middle foot portion 6, and a rear foot portion 7 in the longitudinal direction. Here, the middle foot portion 6 has a distance from the rear end of the buttock (x in FIG. 2) in the range of about 0.2 to 0.65 times the total length of the shoe 1 (L in FIG. 2). The forefoot part 5 means a toe-side range from the middle foot part 6, and the rear foot part 7 means a heel side range from the middle foot part 6. In the present embodiment, the outsole 4 is provided on the front foot portion 5 and the rear foot portion 7, and the midsole 3 is exposed on the bottom surface in the middle foot portion 6 therebetween.

  As shown in FIG. 2, a reinforcing belt 8 (reinforcing portion) having a tensile rigidity larger than a compression rigidity is bonded to the bottom surface of the midfoot portion 6 where the midsole 3 is exposed. The reinforcing belt 8 is installed at an angle of 45 ° with respect to the shoe center line 1C so as to extend from the inner side toward the outer side toward the toe side, and has a width (B in FIG. 2). The material is 15.0 mm and the thickness is 1.0 mm, and the material is carbon fiber or a woven fabric thereof.

  By installing the reinforcing belt 8, the torsional rigidity in the forefoot pronation direction 1A of the shoe 1 can be made larger than the torsional rigidity in the forefoot pronation direction 1B.

  In addition, if the width | variety of the reinforcement belt 8 is about 3.0 mm or more and 20.0 mm or less and the thickness is about 0.5 mm or more and 8.0 mm or less, there exists an effect similar to the above. The material of the belt may be Kevlar fiber or aramid fiber.

  Next, a method for measuring the torsional rigidity of the shoe 1 will be described.

  FIG. 3 is a diagram showing a configuration of an apparatus for measuring torsional rigidity. In this apparatus, as shown in FIG. 3, the heel part of the shoe 1 is fixed at the fixing position 9, and the arm 10 is positioned at a distance of 0.65 L (L is the entire length of the shoe 1) from the rear end of the heel part. To hold the shoe 1. Then, the forefoot portion of the shoe is rotated in the forefoot pronation direction or the forefoot pronation direction by the motor 13 connected to the arm 10 via the torque measuring device 11. Here, when the shoe 1 is a right foot, when the shoe is viewed from the front on the toe side, the direction in which the forefoot rotates clockwise is the forefoot inward direction, and the direction in which it rotates counterclockwise is the forefoot prolapse direction. Become.

  The motor 13 rotates the forefoot portion of the shoe from 0 ° to 35 ° (rotation angle) at a rotation speed of 30 ° / second. At this time, the torque measured by the torque measuring device 11 is displayed on the torque display 12. The torsional rigidity in the forefoot rotation direction is obtained from the clockwise torque here, and the torsional rigidity in the forefoot rotation direction is obtained from the counterclockwise torque.

  In this embodiment, the torsional rigidity in the forefoot pronation direction of the shoe 1 is 0.106 N · m / deg and the torsional rigidity in the forefoot pronation direction is 0.115 N · in the state where the reinforcing belt 8 is not installed. m / deg, and the ratio of the torsional rigidity in the forefoot pronation direction to the torsional rigidity in the forefoot pronation direction was about 0.92. On the other hand, by installing the reinforcing belt 8, the torsional rigidity in the forefoot pronation direction is 0.150 N · m / deg, and the torsional rigidity in the forefoot pronation direction is 0.115 N · m / deg. The ratio was about 1.3 times.

  In the present embodiment, with the above configuration, the torsional rigidity in the forefoot pronation direction can be secured while increasing the torsional rigidity in the forefoot pronation direction. It is possible to provide a shoe that suppresses fatigue of the wearer at the time.

  The second embodiment of the present invention will be described below.

  The shoe according to the present embodiment is a modification of the shoe of the first embodiment, and has the same configuration as that shown in FIGS. 1 and 2.

  In this embodiment, the reinforcing belt 8 is installed at an angle of 40 ° with respect to the shoe center line 1C so as to extend from the inner side toward the outer side from the heel side toward the toe side, and has a width of 15. The thickness is 0 mm and the thickness is 1.5 mm, and the material is rubber.

  As a result, the torsional rigidity in the forefoot pronation direction is 0.154 N · m / deg and the torsional rigidity in the forefoot pronation direction is 0.106 N · m / deg. The ratio to the outward torsional rigidity was about 1.45 times.

  In the present embodiment, the above configuration can provide a shoe that can further suppress the feeling of fatigue during traveling than in the first embodiment.

  Since matters other than those described above are the same as those in the first embodiment, description thereof is omitted here.

  A third embodiment of the present invention will be described below with reference to FIGS.

  FIG. 4 is a diagram illustrating a side surface of the shoe 1 according to the present embodiment. 5 is a cross-sectional perspective view showing a corrugated sheet 4A provided on the lower midsole 3B of the shoe 1, and FIG. 6 is a view showing the bottom surface of the shoe 1. As shown in FIG. 4 and 6, the right foot of the shoe 1 is shown. That is, FIG. 4 is a view of the right foot of the shoe 1 as seen from the outer side, and FIG. 6 is a view of the right foot of the shoe 1 as seen from the bottom side.

  The shoe according to the present embodiment is a modification of the shoes of the first embodiment and the second embodiment. As shown in FIG. 4, the midsole 3 is divided into an upper midsole 3A and a lower midsole 3B. Example 1 and Example 2 are different in that a corrugated sheet 4A is provided between the lower midsole 3A and 3B.

  The corrugated sheet 4A is installed on the heel part (rear foot part) of the shoe 1 for the purpose of suppressing rolling in a plurality of directions after landing, and the surfaces thereof are orthogonal to each other as shown in FIG. It has a corrugated shape in which irregularities are arranged in two directions.

  In the present embodiment, the corrugated sheet 4A is extended from the rear foot portion 7 to the middle foot portion 6 as shown in FIG. In the middle foot portion 6, the seat 4A is provided so as to extend from the inner shell side toward the outer shell side toward the toe with respect to the shoe mold center line 1C, and the torsional rigidity in the forefoot pronation direction is increased. Used as a reinforcement.

  Thereby, the torsional rigidity in the front foot pronation direction 1A of the shoe 1 can be made larger than the torsional rigidity in the forefoot prolapse direction 1B, as in the above-described embodiments.

  Here, the corrugated sheet 4A is installed so as to extend from the heel side to the toe side from the inner side to the outer side at an angle of 50 ° with respect to the shoe center line, the width is 20.0 mm, and the thickness is Is 1.5 mm and the material is PAE.

  As a result, the torsional rigidity in the forefoot pronation direction is 0.177 N · m / deg and the torsional rigidity in the forefoot pronation direction is 0.111 N · m / deg. The ratio to the outward torsional rigidity was about 1.59 times.

  In the present embodiment, the above configuration can provide a shoe that can further suppress the feeling of fatigue during traveling than in the first and second embodiments.

  Since matters other than those described above are the same as those in the above-described embodiments, description thereof is omitted here.

  Below, an example of the data regarding the evaluation value regarding running stability and a wearer's fatigue feeling in the shoes of Examples 1 to 3 will be described.

  Eight healthy adult boys were put on conventional shoes and shoes according to Examples 1 to 3, and after running 3 km, the running stability and fatigue of each shoe were evaluated. Here, as a conventional shoe, a shoe having the same configuration as that of the shoe according to Example 1 and Example 2 and having no reinforcing belt attached was used. The evaluation is performed in seven stages (evaluation value is an integer of 1 to 7), and the higher the running stability and the smaller the fatigue, the higher the evaluation value.

  Table 1 shows the above evaluation results. Referring to Table 1, the shoes according to Conventional Example 1 to Conventional Example 3 all have higher running stability than conventional shoes and suppress the wearer's fatigue.

  Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 7 is a view showing the bottom surface of the shoe 1 according to the present embodiment. In FIG. 7, the right foot of the shoe 1 is shown. That is, FIG. 7 is a view of the right foot of the shoe 1 as seen from the bottom side.

  The shoe according to the present embodiment is a modified example of the shoe of each of the above-described embodiments. As shown in FIG. 7, in addition to the reinforcing belt 8A (reinforcing portion) provided in the same manner as in the first and second embodiments. The embodiment differs from the above-described embodiments in that it further includes a reinforcing belt 8B (another reinforcing portion) extending from the outer side toward the inner side toward the toe relative to the shoe type center line with respect to the shoe type center line. . Here, the tensile rigidity of the reinforcing belt 8A (reinforcing part) is larger than the tensile rigidity of the reinforcing belt 8B (other reinforcing part).

  With this configuration, the same effects as those of the above-described embodiments can be obtained.

  Since matters other than those described above are the same as those in the above-described embodiments, description thereof is omitted here.

  Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.

  FIG. 8 is a diagram illustrating the bottom surface of the shoe 1 according to the present embodiment. In FIG. 8, the right foot of the shoe 1 is shown. That is, FIG. 8 is a view of the right foot of the shoe 1 as seen from the bottom side.

  The shoe according to this embodiment is a modified example of the shoe of each embodiment described above, and as shown in FIG. 8, each of the above-described embodiments is different from the above-described embodiment in that the reinforcing portion is formed of two reinforcing belts 8C and 8D. Different.

  With this configuration, the same effects as those of the above-described embodiments can be obtained.

  Since matters other than those described above are the same as those in the above-described embodiments, description thereof is omitted here.

  Next, the effects of the above-described torsional rigidity and the like on the running stability of shoes and the suppression of fatigue during running will be described with reference to FIGS.

  FIG. 9 is a diagram showing an example of the relationship between the ratio of the torsional rigidity (G1) in the forefoot pronation direction and the torsional rigidity (G2) in the forefoot pronation direction and the evaluation value of the shoe. The evaluation value is obtained by the above-described method regarding the running stability of each shoe and the fatigue feeling of the wearer. In addition, the alternate long and short dash line in FIG. 9 indicates the evaluation value of each sample related to running stability (hereinafter referred to as the driving stability evaluation value), and the solid line indicates the evaluation value of each sample related to the wearer's fatigue feeling (hereinafter referred to as the driving stability evaluation value). , The fatigue evaluation value), and curves obtained by the least square method are shown.

  From the viewpoint of providing a shoe excellent in running stability and feeling of fatigue, in FIG. 9, the running stability evaluation value and the fatigue evaluation value both have a certain evaluation value (for example, α1 in FIG. 9, more preferably α2 in FIG. 9). ) Or more. Here, when the torsional rigidity in the forefoot pronation direction is extremely large, the above ratio increases, and the fatigue evaluation value decreases. Therefore, the ratio (G1 / G2) is preferably greater than 1.0 and about 2.0 or less (more preferably about 1.2 or more and 1.6 or less).

  FIG. 10 is a diagram illustrating an example of the relationship between the magnitude of torsional rigidity (G) of a shoe and the evaluation values (running stability evaluation value and fatigue evaluation value) of the shoe. Also in FIG. 10, as in FIG. 9, the alternate long and short dash line indicates a curve obtained from the running stability evaluation value of each sample, and the solid line indicates a curve obtained from the fatigue evaluation value by the least square method. The torsional rigidity (G) indicates the torsional rigidity (G2) in the forefoot prolapse direction of each sample with respect to the running stability evaluation value, and the torsional rigidity in the forefoot pronation direction of each sample with respect to the fatigue evaluation value. (G1) is shown.

  From the viewpoint of providing shoes excellent in running stability and feeling of fatigue, in FIG. 10, the running stability evaluation value and the fatigue evaluation value both have a certain evaluation value (for example, α1 in FIG. 10, more preferably α2 in FIG. 10). ) Or more. Therefore, the torsional rigidity in the forefoot pronation direction is about 0.05 (N · m / deg) or more, and the torsional rigidity in the forefoot pronation direction is about 0.8 (N · m / deg) or less (more preferably). The torsional rigidity in the forefoot gyrus direction is about 0.1 (N · m / deg) or more, and the torsional rigidity in the forefoot gyrus direction is about 0.4 (N · m / deg) or less) Is preferred. Here, if the torsional rigidity in the forefoot rotation direction is extremely small, the running stability evaluation value decreases, and if the torsional rigidity in the forefoot rotation direction is extremely large, the fatigue evaluation value decreases. Here, since the torsional rigidity (G1) in the forefoot pronation direction is larger than the torsional rigidity (G2) in the forefoot pronation direction (G1> G2), if G1 and G2 are within the above range, A decrease in the running stability evaluation value does not become a problem when the value of G1 is small, and a decrease in the fatigue evaluation value does not become a problem when the value of G2 is large.

  FIG. 11 is a diagram schematically showing the relationship between the installation angle of the reinforcing portion and the torsional rigidity (G1) in the forefoot pronation direction of the shoe on which the member is installed. In addition, an installation angle means the angle between the reinforcement part extended from the inner upper side to the outer upper side toward a toe, and a shoe-type centerline.

  In FIG. 11, the broken line indicates the relationship between the installation angle and the parallel bending rigidity, and the alternate long and short dash line indicates the relationship between the installation angle and the vertical bending rigidity. Here, in a space defined by X, Y, and Z axes orthogonal to each other, parallel bending is performed when the bottom surface of the shoe 1 is arranged on the XY plane so that the shoe center line is parallel to the X axis. The rigidity indicates the bending rigidity around the Y axis, and the vertical bending rigidity indicates the bending rigidity around the X axis.

  Referring to FIG. 11, the parallel bending rigidity (broken line) is maximum at an installation angle of 0 °, and decreases with an increase in the installation angle. Further, the vertical bending rigidity (dashed line) is minimum at an installation angle of 0 °, and increases with an increase in the installation angle. The torsional rigidity (solid line) is calculated by the parallel and vertical rigidity described above, and becomes maximum when the installation angle is about 45 °.

  Here, it is preferable that the torsional rigidity in the forefoot pronation direction is equal to or greater than a certain value (for example, β1, more preferably β2 in FIG. 11). Therefore, the installation angle is preferably about 30 ° to 60 ° (more preferably about 40 ° to 50 °). When the installation angle is extremely small or extremely large, the torsional rigidity in the forefoot pronation direction (G1) is not sufficiently increased even if the reinforcing portion is installed. Therefore, measures such as increasing the cross section of the reinforcing portion are necessary to obtain the effect of increasing running stability, which is inefficient.

  FIG. 12 is a diagram showing an example of the relationship between the ratio of the tensile stiffness of the reinforcing portion to the compression stiffness (hereinafter referred to as the stretch stiffness ratio) and the evaluation value of the shoe in which the member is installed. In addition, as an evaluation value, the total value of the travel stability evaluation value and the fatigue evaluation value described above is used.

  Referring to FIG. 12, the evaluation value of the shoe to which the member is attached is improved as the expansion / contraction rigidity ratio of the reinforcing portion is larger. Therefore, it is preferable to use a member having a ratio of tensile rigidity to compression rigidity as large as possible. In addition, by using various materials such as rubber-based, plastic-based, fiber-based, and metal-based as the reinforcing portion, it is possible to realize an arbitrary stretch rigidity ratio. The ratio needs to be greater than 1. Examples of such materials include carbon fiber, Kevlar fiber, aramid fiber, polyester fiber, glass fiber, or their woven fabric, rubber, urethane foam, urethane, EVA, nylon, foam rubber, and the like.

  As mentioned above, although embodiment and Example of this invention were described, combining the characteristic part of embodiment mentioned above and each Example is planned from the beginning. Further, it should be considered that the embodiments and examples disclosed this time are examples in all respects and are not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a side view of the shoes concerning Example 1 and Example 2 of the present invention. It is a bottom view of shoes concerning Example 1 and Example 2 of the present invention. It is the figure which showed the structure of the apparatus which measures the torsional rigidity of shoes. It is a side view of the shoes concerning Example 3 of the present invention. It is a section perspective view (detailed drawing) showing the corrugated sheet provided in the shoes concerning Example 3 of the present invention. It is a bottom view of shoes concerning Example 3 of the present invention. It is a bottom view of the shoes concerning Example 4 of the present invention. It is a bottom view of shoes concerning Example 5 of the present invention. It is the figure which showed an example of the relationship between the torsional rigidity ratio of the forefoot part of shoes, and the evaluation value of the shoes. It is the figure which showed an example of the relationship between the magnitude | size of the torsional rigidity of shoes, and the evaluation value of this shoe. It is the figure which showed typically the relationship between the installation angle with respect to the shoe-type centerline of a reinforcement part, and the torsional rigidity of the front foot part pronation direction of the shoes in which this member was installed. It is the figure which showed an example of the relationship between the ratio of the tension | tensile_strength of a reinforcement part, and compression rigidity, and the evaluation value of the shoes in which this member was installed.

Explanation of symbols

  1 shoe, 1A forefoot pronation direction, 1B forefoot pronation direction, 1C shoe center line, 2 upper part, 2A shoe sole, 3 midsole, 3A upper midsole, 3B lower midsole, 4 outsole, 4A Corrugated sheet, 5 Forefoot part, 6 Middle foot part, 7 Rear foot part, 8, 8A, 8B, 8C, 8D Reinforcement belt, 9 Fixing position, 10 Arm, 11 Torque measuring instrument, 12 Torque indicator, 13 Motor, B Reinforcement belt width, L Shoes overall length.

Claims (9)

  Shoes with greater torsional rigidity in the forefoot pronation direction than in the forefoot pronation direction.   The shoe according to claim 1, wherein a ratio of a torsional rigidity in the forefoot pronation direction to a torsional rigidity in the forefoot pronation direction is greater than 1 and 2 or less.   The torsional rigidity in the forefoot gyrus direction is 0.05 (N · m / deg) or more, and the torsional rigidity in the forefoot gyrus direction is 0.8 (N · m / deg) or less. The shoe according to claim 1 or 2. The upper part,
A shoe sole for receiving a wearer's foot between the upper and the upper;
A reinforcing part is provided on the middle foot part of the shoe sole part,
The reinforcing portion is a shoe that extends from the inner shell side toward the outer shell side toward the toe with respect to the shoe mold center line, and has a tensile rigidity larger than the compression rigidity. The reinforcing part is a band-shaped member,
The shoe according to claim 4, wherein an inclination angle of the belt-shaped member with respect to the shoe center line is 30 ° or more and 60 ° or less. The shoe sole includes a midsole joined to a lower portion of the upper part, and an outsole joined to a lower surface of the midsole and in direct contact with a road surface,
The shoe according to claim 4 or 5, wherein the reinforcing portion is provided on the midsole. The shoe sole includes a midsole joined to a lower portion of the upper part, and an outsole joined to a lower surface of the midsole and in direct contact with a road surface,
The shoe according to claim 4 or 5, wherein the reinforcing portion is provided on the outsole. The shoe further includes another reinforcing portion extending from the outer side toward the inner side toward the toe relative to the shoe type center line with respect to the shoe type center line,
The shoe according to any one of claims 4 to 7, wherein a tensile rigidity of the reinforcing part is larger than a tensile rigidity of the other reinforcing part.   The reinforcing portion is at least one material selected from the group consisting of carbon fiber, Kevlar fiber, aramid fiber, polyester fiber, glass fiber, or their woven fabric, rubber, urethane foam, urethane, EVA, nylon, and foam rubber. The shoe according to claim 4, comprising:

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