US20210298416A1 - Shoes - Google Patents

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Publication number
US20210298416A1
US20210298416A1 US17/208,308 US202117208308A US2021298416A1 US 20210298416 A1 US20210298416 A1 US 20210298416A1 US 202117208308 A US202117208308 A US 202117208308A US 2021298416 A1 US2021298416 A1 US 2021298416A1
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United States
Prior art keywords
sole
foot
wearer
forefoot
sole body
Prior art date
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Abandoned
Application number
US17/208,308
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English (en)
Inventor
Shin HIRAI
Kentaro Yahata
Yu TAKEMURA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mizuno Corp
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Mizuno Corp
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Filing date
Publication date
Application filed by Mizuno Corp filed Critical Mizuno Corp
Assigned to MIZUNO CORPORATION reassignment MIZUNO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIRAI, SHIN, TAKEMURA, YU, Yahata, Kentaro
Publication of US20210298416A1 publication Critical patent/US20210298416A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
    • A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
    • A43B7/1415—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot
    • A43B7/144—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot situated under the heel, i.e. the calcaneus bone
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
    • A43B13/18—Resilient soles
    • A43B13/181—Resiliency achieved by the structure of the sole
    • A43B13/186—Differential cushioning region, e.g. cushioning located under the ball of the foot
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
    • A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
    • A43B7/1415—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot
    • A43B7/143—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot situated under the lateral arch, i.e. the cuboid bone
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
    • A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
    • A43B7/1415—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot
    • A43B7/1445—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot situated under the midfoot, i.e. the second, third or fourth metatarsal
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
    • A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
    • A43B7/1415—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot
    • A43B7/145—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot situated under the toes, i.e. the phalanges
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
    • A43B7/16—Footwear with health or hygienic arrangements with foot-supporting parts with elevated heel parts inside

Definitions

  • the present disclosure relates to a shoe.
  • Japanese Patent Application No. 2019-63491 discloses a shoe including a sole supporting an entire planta of a wearer, a plurality of lower protrusions protruding downward from a lower portion of the sole toward the ground and spaced from one another, and a plurality of upper protrusions protruding upward from an upper portion of the sole toward the planta of the wearer, each of the upper protrusions being on an upper side of the sole and overlapping with an associated one of the lower protrusions.
  • the plurality of lower protrusions and the plurality of upper protrusions are arranged in an entire region of the sole both when viewed from the bottom and when viewed from the top.
  • a reaction force from the ground acts on the plurality of lower protrusions and is transferred from the lower protrusions to the wearer's planta via the upper protrusions.
  • the wearer can recognize differences of pressures transferred to various portions of his or her planta in the respective portions throughout the sole.
  • the plurality of lower protrusions and the plurality of upper protrusions are arranged in the entire region of the sole, and therefore, the pressures transferred from the lower protrusions and the upper protrusions are dispersed throughout the planta of the wearer. That is, it is difficult to cause the pressures to concentrate in the forefoot of the foot of the wearer in the shoe.
  • the present disclosure has been devised and it is therefore an object of the present disclosure to relatively increase physical feeling to a pressure applied to a forefoot of a foot of a wearer.
  • a first aspect of the present disclosure relates to a sole for shoes, and the sole includes a sole body, a plurality of lower protrusions arranged at least in a position corresponding to a forefoot of a foot of a wearer in the sole body, each protruding downward from the sole body, and a plurality of upper protrusions arranged at least in a position corresponding to the forefoot of the foot of the wearer in the sole body, each protruding upward from the sole body, each overlapping with an associated one of the plurality of lower protrusions to make a pair of upper and lower protrusions with the lower protrusion in a cross-sectional view.
  • the sole body is configured such that hardness of a portion corresponding to a midfoot of the foot of the wearer is higher than hardness of a portion corresponding to the forefoot of the foot of the wearer.
  • each of the upper protrusions overlaps with an associated one of the plurality of lower protrusions to make a pair of upper and lower protrusions with the lower protrusion in a cross-sectional view. Therefore, a reaction force from the ground acts on the lower protrusions and is transferred from the lower protrusions to the wearer's planta via the upper protrusions. Thus, the wearer can recognize differences of pressures transferred to various portions of his or her planta in the respective portions throughout the sole.
  • the sole body is configured such that the hardness of the portion corresponding to the midfoot is higher than the hardness of the portion corresponding to the forefoot.
  • the sole body is configured such that a value of bending hardness in the portion corresponding to the midfoot of the foot of the wearer is 0.258 Nm/deg or more.
  • the sole body in which shank breaking is less likely to occur can be easily achieved by presetting a lower limit of the bending hardness in the portion of the sole body corresponding to the midfoot.
  • an upper surface of the sole body in the position corresponding to the midfoot of the foot of the wearer is formed to be substantially flat.
  • the lower protrusions are not provided in the upper surface of the midsole in the position corresponding to the midfoot. Accordingly, stresses are less likely to concentrate in the upper surface.
  • the bending hardness of the portion of the sole corresponding to the midfoot can be made higher than the bending hardness of the portion of the sole corresponding to the forefoot. As a result, shank breaking can be restrained.
  • the sole body has an outsole and a midsole arranged on the outsole, and the midsole is configured such that a Young's modulus of a portion corresponding to the midfoot of the foot of the wearer is 0.75 MPa or more.
  • the bending hardness of the portion of the sole corresponding to the midfoot can be ensured at a level at which shank breaking can be restrained. Accordingly, the physical feeling to the pressures transferred to the forefoot of the wearer can be relatively increased.
  • a reinforcement body made of a material having higher hardness than the hardness of the sole body is provided in the position corresponding to the midfoot of the foot of the wearer in the sole body, and the reinforcement body extends from a position corresponding to a Lisfranc joint of the foot of the wearer to a position corresponding to a Chopart joint of the foot of the wearer in a foot length direction in the sole body.
  • the hardness of the portion of the sole body corresponding to the midfoot can be made higher than the hardness of the portion of the sole body corresponding to the forefoot. As a result, shank breaking can be restrained.
  • a sixth aspect of the present disclosure relates to a sole for shoes, and the sole includes a sole body, a plurality of lower protrusions arranged at least in a position corresponding to a forefoot of a foot of a wearer in the sole body, each protruding downward from the sole body, and a plurality of upper protrusions arranged at least in a position corresponding to the forefoot of the foot of the wearer in the sole body, each protruding upward from the sole body, each overlapping with an associated one of the plurality of lower protrusions to make a pair of upper and lower protrusions with the lower protrusion in a cross-sectional view.
  • the sole body is configured such that a thickness of a portion corresponding to a hindfoot of the foot of the wearer is larger than a thickness of a portion corresponding to the forefoot of the foot of the wearer.
  • the sole body in the sole body, a difference between the thickness of the portion corresponding to the hindfoot and the thickness of the portion corresponding to the forefoot is made, and thus, the foot of the wearer can easily tilt forward. Accordingly, the pressures transferred from the lower protrusions and the upper protrusions are easily transferred to the planta of the forefoot of the wearer as appropriate. Therefore, according to the sixth aspect, physical feeling to the pressures transferred to the forefoot of the wearer can be relatively increased.
  • the sole body is configured such that the difference between the thickness of the portion corresponding to the hindfoot of the foot of the wearer and the thickness of the portion corresponding to the forefoot of the foot of the wearer is 8 mm or more.
  • the foot of the wearer can be easily maintained in a tilt forward state.
  • the physical feeling to the pressures transferred to the forefoot of the wearer can be relatively increased.
  • An eight aspect of the present disclosure relates to a shoe including the sole of the first aspect.
  • a ninth aspect of the present disclosure relates to a shoe including the sole of the second aspect.
  • a tenth aspect of the present disclosure relates to a shoe including the sole of the third aspect.
  • An eleventh aspect of the present disclosure relates to a shoe including the sole of the fourth aspect.
  • a twelfth aspect of the present disclosure relates to a shoe including the sole of the fifth aspect.
  • a thirteenth aspect of the present disclosure relates to a shoe including the sole of the sixth aspect.
  • a fourteenth aspect of the present disclosure relates to a shoe including the sole of the seventh aspect.
  • FIG. 1 is an overall perspective view of an entire shoe according to a first embodiment.
  • FIG. 2 is a perspective view of a sole according to the first embodiment illustrating an inner instep side when viewed from above.
  • FIG. 3 is a plan view of the sole according to the first embodiment.
  • FIG. 4 is a plan view schematically illustrating the sole according to the first embodiment with a skeleton structure of a foot of a wearer.
  • FIG. 5 is a bottom view of the sole according to the first embodiment.
  • FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 3 .
  • FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 3 .
  • FIG. 8 is a cross-sectional view illustrating a cross-sectional structure of the sole taken along the line VIII-VIII in FIG. 3 with the skeleton structure of the foot of the wearer.
  • FIG. 9 is a view corresponding to FIG. 8 and illustrating a cross-sectional structure of the sole according to a modified example of the first embodiment with the skeleton structure of the foot of the wearer.
  • FIG. 10 is a view corresponding to FIG. 8 and illustrating a cross-sectional structure of the sole according to a second embodiment with the skeleton structure of the foot of the wearer.
  • FIG. 11 is a graph illustrating a load ratio of a forefoot region in a sole of each test body.
  • FIG. 1 illustrates an entire portion of a shoe S according to a first embodiment of the present disclosure.
  • a pair of the shoes S are used, for example, as athletic shoes for running and various sports, sneakers for daily use, or rehabilitation shoes.
  • FIG. 1 illustrates only a left shoe S as an example. Since a right shoe is symmetrical to the left shoe, only the left shoe will be described in the following description, and the description of the right shoe will be omitted herein.
  • a “plantar arch” includes both a plantar arch in an inner instep side of a foot f of the wearer and a plantar arch in an outer instep side of the foot f.
  • a “midfoot M” means a region extending from a position of a Lisfranc joint LF of the foot f of the wearer to a position of a Chopart joint CP of the foot in the foot length direction (see FIG. 4 and FIG. 8 ).
  • the shoe S includes an upper 10 that covers the foot f of the wearer.
  • a knit fabric, a woven fabric, a nonwoven fabric, a synthetic leather, an artificial leather, a natural leather, or the like is suitable as a material of the upper 10 .
  • the upper 10 is firmly fixed to a peripheral portion 5 of a midsole 4 which will be described later, for example, with an adhesive.
  • a foot insertion portion 11 in which the foot f of the wearer is inserted is provided in an upper side of the upper 10 .
  • An opening portion 12 communicating with the foot insertion portion 11 and extending in the longitudinal direction is formed in an upper side of the upper 10 .
  • An eyelet adornment 13 is provided in the opening portion 12 .
  • a tongue-piece portion 15 that puts the opening portion 12 in an open state or a close state is provided in a front edge portion of the opening portion 12 .
  • the eyelet adornment 13 is made of, for example, an artificial leather.
  • the eyelet adornment 13 is arranged in a position corresponding to an instep part of the foot f of the wearer in the upper 10 .
  • the eyelet adornment 13 is firmly fixed to the upper 10 by sewing.
  • eyelet holes 14 are formed so as to be spaced apart from one another in the foot length direction 3 .
  • the upper 10 is provided with a shoe lace 16 .
  • the shoe lace 16 can be inserted through the eyelet holes 14 located in the left and right edge portions of the eyelet adornment 13 .
  • the upper 10 can be made to fit the instep part of the wearer by fastening both end portions of the shoe lace 16 located in the foot insertion portion 11 .
  • the shoe S has a sole 1 .
  • the sole 1 has a sole body 2 .
  • the sole body 2 is formed of an outsole 3 and a midsole 4 .
  • the out sole 3 is made of a hard elastic material with higher hardness than that of the midsole 4 .
  • a material of the outsole 3 for example, thermoplastic synthetic resins, such as ethylene-vinyl acetate copolymer (EVA) or the like, thermosetting resins, such as polyurethane (PU) or the like, or rubber materials, such as butadiene rubber, chloroprene rubber, or the like are suitable.
  • EVA ethylene-vinyl acetate copolymer
  • PU polyurethane
  • rubber materials such as butadiene rubber, chloroprene rubber, or the like
  • the hardness of the outsole 3 is preferably set to, for example, 50 A to 80 A in the Asker A scale.
  • bottomed lower recesses 3 a recessed upward from a lower surface of the outsole 3 in a cross-sectional view.
  • the lower recesses 3 a are arranged substantially in an entire region of the outsole 3 when viewed from the bottom (see FIG. 5 ).
  • the midsole 4 is arranged on an upper side of the outsole 3 in a stacked state, for example, with an adhesive.
  • the midsole 4 is made of a soft elastic material with lower hardness than that of the outsole 3 .
  • thermoplastic synthetic resins such as ethylene-vinyl acetate copolymer (EVA) or the like, foams thereof, thermosetting resins, such as polyurethane (PU) or the like, foams thereof, rubber materials, such as butadiene rubber, chloroprene rubber, or the like, foams thereof, or the like are suitable.
  • EVA ethylene-vinyl acetate copolymer
  • PU polyurethane
  • the hardness of the midsole 4 is preferably set to, for example, 15 C to 65 C in the Asker C scale.
  • a peripheral portion 5 is formed to support a peripheral of the planta of the foot f of the wearer in a peripheral of an upper surface of the midsole 4 .
  • bottomed upper recesses 4 a recessed downward from an upper surface of the peripheral portion 5 in a cross-sectional view are formed between the peripheral portion 5 located in an inner instep side and the peripheral portion 5 located in an outer instep side.
  • the upper recesses 4 a are arranged in a position corresponding to a forefoot F of the foot f of the wearer in the midsole 4 when viewed from the top (see FIG. 4 ).
  • the sole 1 has a plurality of lower protrusions 7 and a plurality of upper protrusions 8 .
  • the lower protrusions 7 are arranged to correspond to the entire planta of the foot f of the wearer in the sole 1 (see FIG. 5 ).
  • the upper protrusions 8 are arranged to correspond to the forefoot F of the foot f of the wearer in the sole 1 (see FIG. 4 ).
  • the lower protrusions 7 are provided in the lower recesses 3 a of the outsole 3 . Specifically, as illustrated in FIGS. 6 to 8 , each of the lower protrusions 7 protrudes downward from a bottom surface of an associated one of the lower recesses 3 a . Each of the lower protrusions 7 has, for example, a substantially rectangular shape in a cross-sectional view. The lower protrusions 7 are formed to have different thicknesses and different lengths from one another.
  • the upper protrusions 8 are provided in the upper recesses 4 a of the midsole 4 .
  • each of the upper protrusions 8 protrudes upward from a bottom surface of an associated one of the upper recesses 4 a .
  • An upper end portion of each of the upper protrusions 8 has, for example, a substantially hemispherical shape.
  • the upper protrusions 8 are formed, for example, to have different thicknesses and different lengths from one another.
  • each of the upper protrusions 8 is arranged right above an associated one of the lower protrusions 7 in a region of the forefoot F. That is, each of the upper protrusions 8 overlaps with an associated one of the lower protrusions 7 located in the region of the forefoot F to make a pair of upper and lower protrusions with the lower protrusion 7 in a cross-sectional view.
  • the sole body 2 is configured such that hardness of a portion thereof corresponding to a midfoot M of the foot of the wearer is higher than hardness of a portion thereof corresponding to the forefoot F.
  • the sole body 2 is preferably configured such that a value of bending hardness in the portion corresponding to the midfoot M is 0.258 Nm/deg or more.
  • a value of bending hardness in the portion corresponding to the midfoot M is 0.258 Nm/deg or more.
  • the above-described hardness value is a numerical value that can be obtained in a case where a bending test is performed on the sole body 2 in which a reinforcement body 9 which will be described later is not provided.
  • the following measurement method (bending test) is suitable. That is, using an unillustrated general-purpose bending test machine (for example, “Shoe Flexer”, a product manufactured by Schwarz Research), a pressing sensor of the test machine is fixed to be pressed against the sole body 2 in a position of the sole body 2 corresponding to the midfoot M of the sole body 2 in which the reinforcement body 9 which will be described later is not provided and, in this fixed state, a rear end portion of the sole body 2 is raised by a predetermined angle (for example, 40 deg) from a horizontal position.
  • the hardness value output from the bending test machine may be 0.258 Nm/deg or more.
  • the upper surface of the midsole 4 in positions corresponding to the midfoot M and a hindfoot H is formed to be substantially flat. That is, in the midsole 4 , the upper protrusions 8 are not provided at least in the position corresponding to the midfoot M. Thus, the hardness of a portion of the sole body 2 corresponding to the midfoot M can be relatively increased. It is preferable that a Young's modulus of the portion of the midsole 4 corresponding to the midfoot M is made to be 0.75 MPa or more by forming the upper portion of the midsole 4 in the position corresponding to the midfoot M substantially flat. Note that “substantially flat” as described above expresses not only “completely flat” but also “substantially flat” including “slightly rounded.”
  • the sole body 2 is provided with the reinforcement body 9 that further increases the hardness of the portion corresponding to the midfoot M of the wearer.
  • the reinforcement body 9 is formed of a thin layer with higher hardness than that of those of the outsole 3 and the midsole 4 and is preferably made of a hard elastic material.
  • the hard elastic material examples include thermoplastic resins, such as thermoplastic polyurethane (TPU), polyamide elastomer (PAE), ABS resin, or the like, and thermosetting resins, such as epoxy resin, unsaturated polyester resin, or the like.
  • thermoplastic resins such as thermoplastic polyurethane (TPU), polyamide elastomer (PAE), ABS resin, or the like
  • thermosetting resins such as epoxy resin, unsaturated polyester resin, or the like.
  • FRP fiber-reinforced plastic
  • the reinforcement body 9 has a substantially trapezoidal shape when viewed from the top.
  • an outer shape of the reinforcement body 9 has a substantially trapezoidal shape whose side located in the inner instep side has a larger length than a length of a side located in the outer instep side when viewed from the top. That is, the reinforcement body 9 is configured such that, in an arch portion of the foot of the wearer, the hardness is higher in a position corresponding to the arch portion of the inner instep side than in a position corresponding to the arch portion of the outer instep side.
  • the reinforcement body 9 is arranged to correspond to the midfoot M of the foot of the wearer in the sole body 2 . That is, the reinforcement body 9 is arranged behind the upper protrusions 8 in the foot length direction.
  • the reinforcement body 9 extends from a position corresponding to the Lisfranc joint LF of the foot f of the wearer to a position corresponding to the Chopart joint CP of the foot fin the sole body 2 in the foot length direction.
  • the reinforcement body 9 is formed to have a substantially plate shape.
  • the reinforcement body 9 has a uniform thickness.
  • the reinforcement body 9 is provided between the outsole 3 and the midsole 4 in a stacked arrangement in a cross-sectional view. Specifically, a lower surface of the reinforcement body 9 is firmly fixed to an upper surface of the outsole 3 and an upper surface of the reinforcement body 9 is firmly fixed to a lower surface of the midsole 4 . Note that the thickness of the reinforcement body 9 may not be uniform.
  • each of the upper protrusions 8 overlaps with an associated one of the lower protrusions 7 to make a pair of upper and lower protrusions with the lower protrusion 7 in a cross-sectional view. Therefore, a reaction force from the ground acts on the lower protrusions 7 and is transferred from the lower protrusions 7 to the planta of the foot f via the upper protrusions 8 . Thus, the wearer can recognize the differences of pressures transferred to various portions of the forefoot F.
  • a load trajectory (so-called load path) of weight shift that passes from an outer instep side of a heel to a toe via substantially center portions of a hindfoot and a midfoot in a foot width direction and an inner instep side of a forefoot is generated.
  • load path when bending hardness of a portion of the sole corresponding to the midfoot is relatively low, a phenomenon (that is, “shank breaking”) that the portion of the sole corresponding to the midfoot is broken (bent) tends to occur.
  • the sole body 2 of this embodiment is configured such that the hardness of the portion corresponding to the midfoot M is higher than the hardness of the portion corresponding to the forefoot F.
  • the above-described shank breaking is less likely to occur.
  • the timing of weight shift from the midfoot M to the forefoot F is not delayed in the load path and the weight of the wearer tends to be applied to a portion of the sole 1 corresponding to the forefoot F.
  • pressures from the lower protrusions 7 and the upper protrusions 8 can be easily transferred to the planta of the wearer in the forefoot F. Accordingly, in the sole 1 according to the first embodiment and the shoe S including the sole 1 , the physical feeling to the pressures transferred to the forefoot F of the wearer can be relatively increased.
  • the sole body 2 is configured such that the value of bending hardness in the portion corresponding to the midfoot M is 0.258 Nm/deg or more. As described above, a lower limit of the bending hardness in the portion of the sole body 2 corresponding to the midfoot M is preset, and thus, the sole body 2 in which shank breaking is not likely to occur can be easily achieved.
  • the upper surface of the midsole 4 in the position corresponding to the midfoot M is formed to be substantially flat. That is, the lower protrusions 7 are not provided in the upper surface of the midsole 4 in the position corresponding to the midfoot M. Accordingly, stresses are less likely to concentrate in the upper surface. Thus, the bending hardness of the portion of the sole 1 corresponding to the midfoot M can be made higher than the bending hardness of the portion of the sole 1 corresponding to the forefoot F. As a result, shank breaking can be restrained.
  • the midsole 4 is configured such that the Young's modulus of the portion corresponding to the midfoot M is 0.75 MPa or more. In this configuration, the bending hardness of the portion of the sole 1 corresponding to the midfoot M can be ensured at a level at which shank breaking can be restrained. Accordingly, the physical feeling to the pressures transferred to the forefoot F of the wearer can be relatively increased.
  • the reinforcement body 9 provided in the portion of the sole body 2 corresponding to the midfoot M the hardness of the portion of the sole body 2 corresponding to the midfoot M can be easily made higher than the hardness of the portion of the sole body 2 corresponding to the forefoot F. As a result, shank breaking can be restrained.
  • the reinforcement body 9 is provided in the sole body 2 , but the present disclosure is not limited to this embodiment.
  • the reinforcement body 9 may not be provided in the sole body 2 .
  • the value of bending hardness in the portion of the sole body 2 corresponding to the midfoot M may be 0.258 Nm/deg or more.
  • the upper surface of the midsole 4 in the position corresponding to the midfoot M may be formed to be substantially flat.
  • the Young's modulus of the portion of the midsole 4 corresponding to the midfoot M may be 0.75 MPa or more. That is, in the sole body 2 , as long as the hardness of the portion corresponding to the midfoot M is made higher than the hardness of the portion corresponding to the forefoot F, similar to the first embodiment, the physical feeling to the pressures transferred to the forefoot F of the wearer can be relatively increased.
  • FIG. 10 illustrates a sole 1 according to a second embodiment of the present disclosure.
  • the sole 1 has a different configuration.
  • a configuration according to the second embodiment is similar to the configuration of the sole 1 according to the first embodiment. Therefore, in the following description, the same component as a corresponding component of in FIGS. 1 to 8 will be denoted by the same reference sign as that of the corresponding component, and detailed description thereof will be omitted.
  • a sole body 2 is configured such that a thickness of a portion corresponding to a hindfoot H is larger than a thickness of a portion corresponding to a forefoot F.
  • a difference between the thickness of the portion corresponding to the hindfoot H and the thickness of the portion corresponding to the forefoot F is preferably set to 8 mm or more. Note that, in the sole body 2 of this embodiment, the reinforcement body 9 described in the first embodiment is not provided.
  • a heel support portion 20 is provided in a position in the sole body 2 corresponding to the hindfoot H which is described in the first embodiment.
  • the heel support portion 20 is made of, for example, the same material as that of a midsole 4 .
  • the heel support portion 20 is formed to have a substantially plate shape in a cross-sectional view.
  • the heel support portion 20 preferably has a thickness of 8 mm.
  • a lower surface of the heel support portion 20 is firmly fixed to an upper surface of the midsole 4 , for example, with an adhesive.
  • a difference between the thickness of the portion corresponding to the hindfoot H and the thickness of the portion corresponding to the forefoot F is made, and thus, a foot f of a wearer can easily tilt forward.
  • a timing of weight shift from the hindfoot H to the forefoot F is not delayed and a weight of the wearer tends to be applied to a portion of the sole 1 corresponding to the forefoot F.
  • pressures from the lower protrusions 7 and the upper protrusions 8 can be easily transferred to the planta of the wearer in the forefoot F, as appropriate. Accordingly, even in this embodiment, the physical feeling to the pressures transferred to the forefoot F of the wearer can be relatively increased.
  • the sole body 2 is configured such that the difference between the thickness of the portion corresponding to the hindfoot H and the thickness of the portion corresponding to the forefoot F is 8 mm or more. With this configuration, the foot f of the wearer can be easily maintained in a tilt forward state. As a result, the physical feeling to the pressures transferred to the forefoot F of the wearer can be relatively increased.
  • the sole 1 includes the sole body 2 formed of the outsole 3 and the midsole 4 , but the present disclosure is not limited thereto.
  • the sole body 2 may be formed of the outsole 3 .
  • the upper protrusions 8 are arranged only in the position of the midsole 4 corresponding to the forefoot F, but the present disclosure is not limited thereto.
  • the upper protrusions 8 may be arranged in both the position of the sole body 2 corresponding to the forefoot F and the position of the sole body 2 corresponding to the hindfoot H.
  • the upper protrusions 8 may be arranged in the position of the sole body 2 corresponding to the forefoot F and the position of the sole body 2 corresponding to the midfoot M and/or the hindfoot H.
  • each of the upper protrusions 8 may overlap with an associated one of the lower protrusions 7 to make a pair of upper and lower protrusions with the lower protrusion 7 in a cross-sectional view, and the lower protrusions 7 may not be arranged substantially in the entire portion of the lower surface of the outsole 3 .
  • the lower protrusions 7 are formed to have different thicknesses and different lengths from one another, but the present disclosure is not limited thereto. That is, the lower protrusions 7 may be formed to have the same thickness and the same length. Similar applies to the upper protrusions 8 .
  • the upper surface of the sole body 2 in the position corresponding to the midfoot M is formed to be substantially flat, but the present disclosure is not limited thereto. That is, when the value of bending hardness in the portion of the sole body 2 corresponding to the midfoot M is 0.258 Nm/deg or more, the upper surface of the sole body 2 in the position corresponding to the midfoot M may not be formed to be substantially flat.
  • the reinforcement body 9 has a substantially trapezoidal shape when viewed from the top, but the present disclosure is not limited thereto. That is, the reinforcement body 9 may have various shapes, such as a circular shape, a triangular shape, a pentagonal shape, or the like when viewed from the top.
  • the reinforcement body 9 is provided between the outsole 3 and the midsole 4 in a stacked arrangement, but the present disclosure is not limited thereto.
  • the reinforcement body 9 may be embedded in the outsole 3 or in the midsole 4 .
  • the upper surface of the reinforcement body 9 may be stacked on the lower surface of the outsole 3 .
  • the lower surface of the reinforcement body 9 may be stacked on the upper surface of the midsole 4 .
  • the reinforcement body 9 described in the first embodiment is not provided in the sole body 2 , but the present disclosure is not limited thereto. That is, even in the second embodiment, the reinforcement body 9 can be provided in the sole body 2 .
  • the heel support portion 20 formed as one member is provided in the position in the sole body 2 corresponding to the hindfoot H, but the present disclosure is not limited thereto.
  • a member (not illustrated) in which the heel support portion 20 is integrally formed with the sole body 2 may be used. That is, in the second embodiment, as long as a difference between the thickness of the portion corresponding to the hindfoot H and the thickness of the portion corresponding to the forefoot F is made in the sole body 2 , whether the heel support portion 20 is formed as a separate member from the sole body 2 does not matter.
  • a test subject wore four shoe test bodies and the test subject's foot pressure when the test subject wore each of the four shoe test bodies was measured.
  • a load ratio of a portion of the sole corresponding to a forefoot (which will be hereinafter referred to merely as a “load ratio”) was calculated from results of the measurement, and then, calculated load ratios were compared and examined. Note that the present disclosure it not limited to the examples.
  • a position (which will be hereinafter referred to as a “toe position”) in which a toe (a forefoot front end) of a foot of the test subject contacted a sole of each test body and a position (which will be hereinafter referred to as a “heel position”) in which a heel (a hindfoot rear end) of the foot of the test subject contacted the sole of the test body are specified.
  • a distance (which will be hereinafter referred to as a “foot length distance”) in a foot length direction in the foot of the test subject contacting the sole of each test body is specified.
  • a position separated from the heel position in a forward direction by a distance of 55.8% of the foot length distance is defined as a position of the forefoot rear end in the foot of the test subject.
  • a region (which will be hereinafter referred to as a “forefoot region”) of the forefoot in the foot of the test subject contacting the sole of each test body is specified.
  • a first total value A for the foot pressure applied to the forefoot region and a second total value B for the foot pressure applied to a region ranging from the toe position to the heel position are calculated.
  • the load ratio X (%) of each test body obtained by the above-described measurement is illustrated in Table 1 (see the right column in Table 1) and FIG. 11 .
  • the load ratio X is less than 50%. That is, when the difference between the thickness of the portion corresponding to the forefoot and the thickness of the portion corresponding to the hindfoot in the sole was 4 mm and 6 mm, the foot pressure on the forefoot region of the sole was relatively low.
  • the load ratio X is 50% or more. That is, when the difference between the thickness of the portion corresponding to the forefoot and the thickness of the portion corresponding to the hindfoot in the sole was 8 mm or more, the foot pressure on the forefoot region of the sole was relatively high.
  • the foot pressure on the forefoot region of the sole can be made relatively high by configuring the sole body such that the difference between the thickness of the portion corresponding to the hindfoot and the thickness of the portion corresponding to the forefoot in the sole is 8 mm or more.
  • the foot of the test subject wearinger
  • the foot of the test subject can be easily maintained in a tilt forward state and the physical feeling to the pressure on the forefoot of the wearer can be relatively increased.
  • the present disclosure is industrially applicable to, for example, soles applied to sport shoes used in various kinds of sports such as running and ball games, sneakers for daily use, and shoes for rehabilitation, and shoes using the soles.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
US17/208,308 2020-03-27 2021-03-22 Shoes Abandoned US20210298416A1 (en)

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Citations (7)

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Publication number Priority date Publication date Assignee Title
US4498251A (en) * 1983-02-07 1985-02-12 Mercury International Trading Corp. Shoe design
US5400526A (en) * 1993-09-14 1995-03-28 Sessa; Raymond V. Footwear sole with bulbous protrusions and pneumatic ventilation
US6061929A (en) * 1998-09-04 2000-05-16 Deckers Outdoor Corporation Footwear sole with integrally molded shank
US6691432B2 (en) * 2001-01-12 2004-02-17 Salomon S.A. Intermediary sole and shoe equipped with such a sole
US20140130370A1 (en) * 2012-11-14 2014-05-15 Puma North America, Inc. Sports footwear traction elements
US20150313310A1 (en) * 2013-01-30 2015-11-05 Mizuno Corporation Sole Structure for Footwear
US20190150558A1 (en) * 2017-11-21 2019-05-23 Altra Llc Flexible midsole for shoe and shoe incorporating same

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Publication number Priority date Publication date Assignee Title
JP4153002B2 (ja) 2006-08-30 2008-09-17 美津濃株式会社 シューズのソール組立体の中足部構造
CN106231945B (zh) 2014-02-25 2020-04-17 迪亚特克斯株式会社 鞋底、鞋内底、鞋大底以及鞋
JP6125549B2 (ja) 2015-01-24 2017-05-10 美津濃株式会社 フットウエア用ソール構造体
JP2017006293A (ja) 2015-06-19 2017-01-12 美津濃株式会社 フットウエア用ソール構造体
JP6963369B2 (ja) 2016-09-30 2021-11-10 美津濃株式会社 シューズ用ソール構造およびそれを用いたシューズ
JP6987027B2 (ja) 2017-09-28 2021-12-22 美津濃株式会社 シューズ用ソール構造およびそれを備えたシューズ
JP7002386B2 (ja) 2018-03-23 2022-01-20 美津濃株式会社 ソール構造およびそれを用いたシューズ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4498251A (en) * 1983-02-07 1985-02-12 Mercury International Trading Corp. Shoe design
US5400526A (en) * 1993-09-14 1995-03-28 Sessa; Raymond V. Footwear sole with bulbous protrusions and pneumatic ventilation
US6061929A (en) * 1998-09-04 2000-05-16 Deckers Outdoor Corporation Footwear sole with integrally molded shank
US6691432B2 (en) * 2001-01-12 2004-02-17 Salomon S.A. Intermediary sole and shoe equipped with such a sole
US20140130370A1 (en) * 2012-11-14 2014-05-15 Puma North America, Inc. Sports footwear traction elements
US20150313310A1 (en) * 2013-01-30 2015-11-05 Mizuno Corporation Sole Structure for Footwear
US20190150558A1 (en) * 2017-11-21 2019-05-23 Altra Llc Flexible midsole for shoe and shoe incorporating same

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JP7454602B2 (ja) 2024-03-22
JP7077354B2 (ja) 2022-05-30
JP2021153891A (ja) 2021-10-07
JP2022103359A (ja) 2022-07-07

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