WO2010038266A1 - 走行効率の良い運動靴の靴底 - Google Patents
走行効率の良い運動靴の靴底 Download PDFInfo
- Publication number
- WO2010038266A1 WO2010038266A1 PCT/JP2008/067710 JP2008067710W WO2010038266A1 WO 2010038266 A1 WO2010038266 A1 WO 2010038266A1 JP 2008067710 W JP2008067710 W JP 2008067710W WO 2010038266 A1 WO2010038266 A1 WO 2010038266A1
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- WIPO (PCT)
- Prior art keywords
- midsole
- foot
- shoe sole
- groove
- middle foot
- Prior art date
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B5/00—Footwear for sporting purposes
- A43B5/06—Running shoes; Track shoes
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/026—Composites, e.g. carbon fibre or aramid fibre; the sole, one or more sole layers or sole part being made of a composite
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/12—Soles with several layers of different materials
-
- 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
- A43B13/141—Soles; Sole-and-heel integral units characterised by the constructive form with a part of the sole being flexible, e.g. permitting articulation or torsion
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- 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
-
- 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
- A43B13/183—Leaf springs
-
- 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
- A43B13/187—Resiliency achieved by the features of the material, e.g. foam, non liquid materials
-
- 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
- A43B7/24—Insertions or other supports preventing the foot canting to one side , preventing supination or pronation
Definitions
- the present invention relates to a sole of an athletic shoe suitable for efficient running.
- Japanese Patent Application Laid-Open No. 2008-29717 discloses a structure of a shoe sole that promotes a rolling motion during walking.
- the shoe sole disclosed in this document has a thin groove extending from the rear foot portion to the front foot portion.
- US2007 / 0193065A1 and WO2006 / 120749A1 disclose resin parts formed in a U shape from the rear foot portion to the middle foot portion.
- the resin parts disclosed in these documents have substantially equal strength inside and outside the foot.
- the longitudinal groove is not formed in the forefoot part of the shoes of each said literature.
- the shoe sole disclosed in WO2008 / 047538A1 has depressions in the front foot portion and the rear foot portion.
- the depression of the forefoot part is not parallel along the outer edge of the forefoot part, but is formed along the inner and outer center lines of the forefoot part.
- the shoe sole of the same literature does not have a flexible strip
- USP 6,694,642 discloses a cup sole having a through hole in the central portion of the rear foot.
- the shoe sole disclosed in Japanese Patent Application Laid-Open No. 2000-333705 has a depression in the center of the rear foot, and the inside of the midsole is harder than the outside in the middle foot. However, no longitudinal groove is provided in the forefoot.
- Japanese Patent Application Laid-Open No. 2001-346605 discloses forming a groove in the front foot portion of the outsole.
- Japanese Patent Application Laid-Open No. 2008-29717 discloses that an elderly person or an infant can easily walk by forming a groove at a predetermined position along the longitudinal direction of the shoe sole.
- the movement center of the load center is significantly different between walking and running.
- the present inventors conducted the following test to obtain the movement locus during running different from walking, and completed the present invention.
- the groove 100 shown in FIG. 1A and FIG. 1B was formed in a marathon shoe with a flexible sole. Then, the markers 102 were attached to 10 locations on the periphery of the shoe.
- the subject walked at 8 minutes / km on the runway provided with a plate for measuring the center of the load, and the movement locus of the load center during walking was measured.
- the movement trajectory 101 is shown in FIG. 1A.
- the subject traveled on the same road at 3.5 minutes / km, and the movement locus 101 of the load center during traveling was measured.
- the movement trajectory 101 is shown in FIG. 1B.
- the walking trajectory 101 differs greatly between walking and running. In particular, during running, staying and variation of the movement trajectory 101 are recognized at the following times and points. i) In the first strike (at the moment of landing) ii) inside the middle foot, iii) Near the center of the toes at takeoff.
- the midfoot part is considered. After the heel has landed, as shown in FIG. 1B, when the load center moves to the front midfoot, the foot falls toward the inside of the midfoot. Therefore, the movement trajectory 101 bends inside the middle foot and the load center stays. This bending and stagnation significantly reduce the running efficiency. In order to prevent or suppress this, it is considered that merely forming the groove 100 in the middle foot part is hardly useful, and it is necessary to suppress the collapse of the foot. Therefore, it is presumed that the center of the load can be smoothly guided forward by preventing the inside of the arch from falling in the middle foot portion.
- the movement trajectory 101 at the time of takeoff is unstable. In order to stabilize this, even if the force applied to the shoe sole is small, it may be necessary to bend the shoe sole at a predetermined location along the toe skeleton.
- a shoe sole of an athletic shoe according to an aspect of the present invention is an athletic shoe sole suitable for efficient running, wherein the sole has a front foot portion, a middle foot portion, and a rear foot portion continuous in the front-rear direction of the foot. And a midsole that is continuous in the width direction of the foot with an inner side, an outer side, and a center part between the inner side and the outer side, and that has an upper surface and a lower surface to cushion a landing impact, and is disposed below the midsole.
- An outsole, and the midsole has a midsole body formed of a resin foam in the forefoot part, the outsole is provided in the forefoot part and the rear foot part, A reinforcing member that supports the arch of the foot and suppresses the lowering of the arch is provided at the middle foot portion, and a recess that extends forward from the rib in the rear foot portion and is not grounded is formed.
- the reinforcing member and the midsole are provided so that a belt-like region continuous to the depression is provided, and in the middle foot part, the upper surface of the midsole is less likely to sink downward due to a load from above compared to the belt-like region and the outer side.
- the midsole body and the outsole are formed with longitudinal grooves extending in the front-rear direction at the center portion and continuing to the belt-like region, and the depth of the longitudinal grooves is 5 mm to 20 mm
- the longitudinal groove is provided from the rear end of the forefoot part to the proximal interphalangeal joint of the second heel, and the longitudinal groove is curved so as to be substantially parallel to the outer edge of the forefoot part of the midsole.
- the width and depth of the vertical groove are smaller than the width and depth of the recess, respectively, and the recess, the band-like region, and the vertical groove are smoothly connected in the front-rear direction.
- the inner side of the upper surface is less likely to sink downward than the center and the outer side, and therefore, it is possible to suppress the load center from moving to the inner side of the middle foot part. Therefore, a smooth forward movement of the load center can be expected. As a result, efficient traveling is possible.
- the shoe sole bends in a longitudinal groove along the outer edge of the forefoot. Therefore, the shoe sole is easily bent at a predetermined portion along the joint of the toe. Therefore, the action of kicking out toward the outer side obliquely forward is smooth.
- the depth of the longitudinal groove is 5 mm to 20 mm
- the average value of the deepest portion of the longitudinal groove is 5 mm to 20 mm
- the depth of the deepest portion in the transverse cross section of the longitudinal groove is 5 mm to 20 mm. Therefore, a part exceeding 20 mm or a part less than 5 mm may locally exist in a part of the deepest part of the longitudinal groove.
- the following various structures can be used alone or in combination.
- a reinforcing member having high rigidity on the inside and small rigidity on the belt-like region and the outside can be employed.
- the reinforcing member disposed on the lower surface of the midsole is thick on the inner side of the lower surface, while being thin on the band-like region and the outer side of the lower surface, or has a through hole.
- the thickness of the midsole body is large on the inside and small on the belt-like region and outside.
- the midsole body may be divided vertically.
- the structure may be such that one of the midsole main bodies separated vertically is provided on the inside of the midfoot, and is not provided on the outside of the belt-like region or the midfoot.
- a structure is adopted in which the reinforcing member is bonded to the inside of the lower surface of the midsole, while being separated from the lower surface of the midsole body in the belt-like region and not bonded to the lower surface.
- This type of structure is disclosed in WO 2005/037002, the entire disclosure of which is hereby incorporated by reference.
- the reinforcing member may be doubled up and down only on the inner side, and only one piece may be provided on the belt-like region and the outer side.
- the “depth of the groove or the depression” means a distance from the ground contact surface to the lower surface of the midsole.
- whether or not “the width is small” should be determined by comparing the average widths of the grooves and the recesses.
- the groove depth is less than 5 mm, the load center is difficult to concentrate on the groove part in the forefoot.
- the depth of the groove exceeds 20 mm, the forefoot part becomes too thick, or the forefoot part becomes unstable because it feels like the front leg part is cracked inward and outward.
- the depth of the groove may be locally shallower than 5 mm, or conversely, locally deeper than 20 mm. From such a viewpoint, the depth of the groove is preferably 5 mm to 15 mm, and most preferably about 7 mm to 13 mm.
- the width of the recess is preferably about 10 mm to 60 mm, and more preferably about 12 mm to 50 mm.
- the hollow may be a long groove shape.
- a support member made of a non-foamed resin having a shape rolled up along the inner side and the outer side of the rear foot part and supporting the foot in the rear foot part,
- the support member has a penetrating portion for helping the upper surface of the midsole to easily sink downward in the central portion of the rear foot portion.
- the support of the sole is stabilized by the support member, and by supporting the inner and outer sides of the rear foot, it is possible to reliably realize that the upper surface of the midsole sinks downward above the depression.
- the through portion may be formed by a plurality of through holes in addition to one large through hole, or may be formed in a mesh shape. Further, the support member may be formed in a U shape to form the through portion.
- the penetrating portion is provided at least at a part directly below the rib, and is preferably provided at a position including the center of the rib.
- the supporting member extends from the rear foot portion toward the middle foot portion, supports the inside of the foot at the middle foot portion, and supports the outside of the foot at the rear foot portion.
- the support member constitutes a part or all of the reinforcing member in the middle foot portion, and the support member easily sinks the upper surface of the midsole in the middle portion of the middle foot portion and the rear foot portion. It has a penetration to help you become.
- the support of the sole is stabilized by the support member, and the upper surface of the midsole sinks downward in the depression and the belt-like region by supporting the inside and outside of the rear foot portion and the middle foot portion. Realized reliably.
- a support member connected from the rear foot to the middle foot will help the load center move smoothly forward.
- support means that a support member is disposed on the lower surface of the midsole body, and the support member may not be bonded to the lower surface.
- a erection piece constituting a part of the reinforcing member is erected between the rear end of the front foot part of the midsole body and the front end of the rear foot part. It is useful for the inside of the middle foot portion to be less likely to sink downward compared to the belt-like region.
- the inner side of the middle foot part is reinforced by the installation piece, and therefore the upper surface of the midsole is more likely to sink downward in the band-like region than in the inner side of the middle foot part. Therefore, traveling efficiency is further improved.
- the midsole further includes the midsole body at a midfoot part, the support member is joined to the lower surface of the midsole body inside the midfoot part, and The outer side of the middle foot is not joined to the lower surface of the midsole body and is separated from the lower surface of the midsole body.
- the support member is separated from the lower surface of the midsole body outside the midsole body. Therefore, the midsole body tends to sink downward.
- the upper surface of the midsole is less likely to sink downward than the outside of the midfoot portion. Therefore, the load center is easy to move smoothly forward in the middle foot portion.
- the support member further includes an oblique portion extending obliquely forward from the outer side toward the inner side in the belt-like region of the middle foot portion, and in the extending direction of the oblique portion.
- the bending of the midfoot portion in the first direction along the line requires a larger force than the bending of the midfoot portion in the second direction orthogonal to the first direction.
- the through-hole of the support member includes a plurality of parallel through-holes extending obliquely forward as it goes from the outside to the inside in the belt-like region of the middle foot, and the diagonal along the through-hole. Part is formed.
- the forefoot is provided with a first lateral groove along the metatarsal phalanx joint (MP joint) so as to cross the outsole, and the first lateral groove is the outout. Separate the sole back and forth.
- MP joint metatarsal phalanx joint
- the outer side of the forefoot is provided with a second lateral groove extending in a direction crossing the outsole at a position between the distal end of the fifth heel and the distal end of the third heel, More preferably, the second lateral groove is formed so as to be separated as it approaches the outer edge of the midsole.
- the second transverse groove will smooth the flexion of the intercostal joint of the toe, and the movement locus at the time of takeoff will be easy to stabilize.
- the longitudinal groove is formed such that the width and depth of the groove gradually and smoothly increase from the front end of the longitudinal groove toward the middle foot. Yes. In this case, the load center will be easily guided from the middle foot portion to the forefoot portion along the longitudinal groove.
- the reinforcing member is joined to the lower surface of the midsole body on the inner side of the middle foot portion and supports the inner side of the foot, and below the first member on the inner side of the middle foot portion.
- the 2nd member arrange
- a soft cushioning element having a Young's modulus smaller than that of the foam is disposed on the outside of the rear foot as a part of the midsole.
- a dividing groove is provided for dividing the outsole and the buffer element along a radial direction extending obliquely rearward from the center of the heel.
- the soft cushioning element is greatly compressed and deformed during the first strike, and further, the outsole is guided to the divided groove and the load center moves toward the center of the bag. Therefore, it is possible to suppress staying of the load center at the rear foot portion in the first strike. As a result, traveling efficiency is improved.
- FIG. 1A is a plan view showing a movement trajectory when walking while wearing a shoe sole of a comparative example
- FIG. 1B is a plan view showing a movement trajectory together with the shoe sole when traveling while wearing the shoe sole.
- FIG. 1C is a plan view showing a movement locus together with the shoe sole when the shoe sole according to the first embodiment of the present invention is worn and traveled.
- FIG. 2 is a plan view of the shoe sole according to the first embodiment of the present invention.
- FIG. 3 is a plan view showing the sole with the foot skeleton.
- FIG. 4 is a perspective view of the shoe as viewed obliquely from below.
- 5A is a sectional view taken along line VA-VA in FIG. 2, FIG.
- FIG. 5B is a sectional view taken along line VB-VB in FIG. 2
- FIG. 5C is a sectional view taken along line VC-VC in FIG.
- FIG. 6 is a perspective view showing the shoe sole with the outsole removed.
- FIG. 7 is an exploded perspective view of the shoe sole with the outsole removed.
- FIG. 8 is an exploded perspective view of the shoe sole with the outsole removed.
- FIG. 9 is a perspective view showing a heel cup integrally formed with a reinforcing member.
- FIG. 10 is an inner side view of the shoe.
- FIG. 11 is an outer side view of the shoe.
- the present athletic shoe includes an upper 1, a midsole 2, a heel cup 3, an outsole 5, and the like that wrap around the instep.
- the midsole 2 has an upper surface 2u and a lower surface 2d to buffer the landing impact.
- the outsole 5 has a joint surface 50 joined to the lower surface 2d of the midsole 2 and a ground surface 51 that contacts the road surface.
- the midsole 2 has a midsole body 20 formed of a resin foam such as EVA, for example, in the entire area of the front foot 1F, middle foot 1M and rear foot 1R (FIG. 10). Is provided.
- the rear foot portion 1 ⁇ / b> R constitutes the midsole 2
- a rubber-like cushioning element 21 called a gel is disposed below the midsole body 20 and the heel cup 3.
- the cushioning element 21 has a Young's modulus smaller than that of the foam constituting the midsole 2.
- the midsole body 20 may be divided into upper and lower parts in order to dispose the buffer element 21 between the midsole bodies 20.
- the outsole 5 is provided on the front foot portion 1F of FIG. 5A and the rear foot portion 1R of FIG. 5C, and is not provided on the middle foot portion 1M of FIG. 5B.
- the outsole 5 has better wear resistance than the midsole 2 and is made of rubber having a large Young's modulus.
- the heel cup 3 and the installation piece 4 of FIG. 9 are arranged between the midsole 2 and the outsole 5.
- the heel cup 3 is bonded to the lower surface 20 d of the midsole body 20.
- the installation piece 4 is bonded to the lower surface 20 d of the midsole body 20 and the lower surface of the heel cup 3.
- the heel cup 3 and the installation piece 4 are provided with mounting portions 39 and 49 having a substantially V-shaped cross section, respectively.
- the buffer element 21 is mounted on the mounting portions 39 and 49.
- the outsole 5 is bonded to the lower surface 2d of the mounting portions 39, 49.
- the heel cup 3 shown in FIG. 9 is made of a resin non-foamed material and constitutes the first member and the support member of the reinforcing member of the present invention. That is, the heel cup 3 of FIG. 5C has a shape rolled up along the inner side M and the outer side L of the rear foot part 1R, constitutes a support member that supports the foot in the rear foot part 1R, and FIG. The middle foot portion 1M of 5B constitutes a part of the reinforcing member described in detail later.
- the heel cup 3 in FIG. 9 extends from the rear foot portion 1R toward the middle foot portion 1M and supports the inner side M and the outer side L of the foot at the middle foot portion 1M and the rear foot portion 1R. Further, the heel cup 3 has a first through hole 31 for helping the upper surface 2u of the midsole 2 to easily sink downward in the central portion 1Rm (FIG. 2) of the rear foot 1R.
- a dividing groove 7 is provided by dividing the cushioning element 21, the mounting portion 39 and the outsole 5 into a plurality of portions in the rear foot portion 1R.
- the dividing groove 7 in FIG. 3 divides the outsole 5 and the buffer element 21 along the radial direction R extending obliquely rearward from the center of the rib B9 on the outer side L of the rear foot 1R.
- the outer side L of the rear foot 1R When landing, the outer side L of the rear foot 1R is grounded first, and then the center of the heel is grounded. At this time, the dividing groove 7 helps increase the compressive deformation of the outer side L of the rear foot 1R. As a result, as shown in FIG. 1C, the load center G is smoothly guided from the outer side L of the rear foot 1R to the outside of the central portion 1Rm.
- the rear foot 1R is formed with a recess 8 that is not grounded by the buffer element 21 (FIG. 5C), the mounting portions 39 and 49, and the outsole 5.
- the recess 8 is provided in the central portion 1Rm of the rear foot portion 1R, and extends forward from the rib B9 along the cubic bone B7.
- the movement locus 101 is slightly outside the center of the inside and outside in the rear foot 1R (FIG. 2). Therefore, the recess 8 in FIG. 3 only needs to be provided at the center of the rib B9 or on the outside of the center. That is, the depression 8 may be provided in the central portion 1Rm between the inner side M and the outer side L in the rear foot portion 1R.
- the middle foot portion 1 ⁇ / b> M is provided with a belt-like region 9 extending in the front-rear direction Y between the inner side M and the outer side L of the shoe sole and smoothly connected to the recess 8.
- the inner side M has the heel cup 3, so that the upper surface 2u (FIG. 5B) of the midsole 2 is less likely to sink downward due to a load from above compared to the belt-like region 9 and the outer side L.
- An installation piece 4 and a midsole 2 are provided.
- the structure will be described in detail.
- the support part 30 of the heel cup 3 has a thickness of the inner side M larger than that of the outer side L and the central part C. Therefore, the upper surface 2 u of the midsole 2 is unlikely to sink downward on the inner side M.
- a plurality of second through holes 32 are formed in the heel cup 3 in the central portion C of the middle foot portion 1M shown in FIG. Therefore, the upper surface 2 u of the midsole 2 in FIG. 5B tends to sink downward in the band-like region 9. Therefore, the load center G is smoothly guided from the recess 8 of the rear foot 1R to the band-like region 9 as shown in FIG. 1C.
- the support portion 30 of the heel cup 3 is bonded to the lower surface 20d of the midsole body 20 from the rear foot portion 1R to the middle foot portion 1M on the inner side M.
- the support portion 30 of the heel cup 3 shown in FIGS. 7 and 11 is bonded to the lower surface 20d (FIG. 11) of the midsole body 20 at the rear foot portion 1R and the front foot portion 1F of the outer side L.
- the middle foot 1M is not bonded and is separated from the lower surface 20d of the midsole body 20.
- the lower surface 20 d of the midsole body 20 is displaced downward between the support part 30 of the heel cup 3 and the lower surface 20 d of the midsole body 20 in the middle foot part 1M of the outer side L.
- a first gap ⁇ 1 is provided to allow the above. Therefore, the upper surface 2u of the midsole 2 in FIG.
- the installation piece 4 is installed between the rear end of the front foot 1F of the midsole body 20 and the front end of the rear foot 1R.
- the installation piece 4 is useful for the inner side M of the middle foot portion 1M being less likely to sink below the band-like region 9.
- the bending rigidity of the installation piece 4 shown in FIG. 5B is larger than the bending rigidity of the inner side M of the middle foot part 1M of the heel cup 3. 7 is bonded to the heel cup 3 at the rear foot portion 1R, and is bonded to the lower surface 2d of the midsole 2 at the front foot portion 1F, but the supporting portion of the heel cup 3 at the middle foot portion 1M. 30 apart. That is, the second gap ⁇ 2 is provided between the heel cup 3 and the installation piece 4 on the inner side M of the middle foot portion 1M in FIG. 5B.
- the erection piece 4 suppresses pushing up to the sole. Further, the structure of the erection piece 4 prevents the sole from bending at the inner side M of the middle foot portion 1M, and suppresses the valgus of the foot, thereby suppressing the decrease in the arch inside the foot. Thereby, it is suppressed that the load center G moves to the inner side M in the middle foot part 1M.
- a plurality of oblique portions 33 are formed in the belt-like region 9 of the heel cup 3.
- the diagonal portion 33 extends from the outer side L toward the front side of the inner side M toward the belt-like region 9 of the middle foot portion 1M.
- the second through holes 32 of the heel cup 3 extend parallel to each other from the outer side L toward the front side of the inner side M in the belt-like region 9 of the middle foot part 1M.
- the oblique portion 33 is formed along the second through hole 32.
- the bending of the midfoot portion 1M in the first direction D1 along the extending direction of the oblique portion 33 causes the midfoot portion 1M in the second direction D2 orthogonal to the first direction D1.
- a greater force is required than bending. Therefore, it is suppressed that the load center G of FIG. 1 moves from the strip
- a longitudinal groove 10 is formed in the midsole body 20 and the front foot portion 1F of the heel cup 3 as shown by the halftone dots in FIG.
- the longitudinal groove 10 extends in the front-rear direction Y at the inner and outer central portions C of the front foot portion 1F and continues to the belt-like region 9.
- the vertical groove 10 has a width W (FIG. 5A) and a depth D (FIG. 5A) equivalent to the belt-like region 9 at the rear end of the front foot portion 1 ⁇ / b> F, and is smoothly connected to the belt-like region 9.
- the depth D and the width W of FIG. 5A gradually decrease as shown in FIG.
- the vertical groove 10 in FIG. 5A makes the upper surface 2u of the center portion C of the midsole 2 easily sink downward in the forefoot portion 1F. Therefore, the load center G in FIG. 1C tends to concentrate on the vertical groove 10, smoothly moves from the strip-shaped region 9 to the vertical groove 10, and the movement locus 101 follows the vertical groove 10.
- the longitudinal groove 10 extends from the rear end of the forefoot 1F, that is, from the proximal head of the metatarsals B4 2 to B4 4 of the second, third or fourth heel, and to the proximal of the second heel. Up to the interphalangeal joint J 2 is provided.
- the longitudinal groove 10 is curved so as to be substantially parallel to the outer edge 2e of the front foot portion 1F of the midsole 2.
- the load center G in FIG. 1C is from the inner and outer centers along the longitudinal groove 10 to the proximal interphalangeal joint J 2 of the second heel in FIG. toward the B1 1 to move smoothly.
- the depth D of the longitudinal groove 10 in FIG. 5A is about 7 mm to 13 mm.
- the width W and depth D of the vertical groove 10 are smaller than the width W and depth D of the recess 8 in FIG. 5C, respectively. As shown in FIG. 4, the width W and the depth D of the vertical groove 10 gradually and smoothly increase from the front end toward the middle foot 1M.
- the front foot portion 1 ⁇ / b> F is provided with a first lateral groove 11 along the middle foot phalanx joint MP so as to cross the midsole 2 and the outsole 5.
- a second lateral groove 12 extending in the direction is provided.
- the outsole 5 is separated forward and backward by a first lateral groove 11 and a second lateral groove 12.
- the second lateral groove 12 is formed so as to be separated from the first lateral groove 11 of FIG. 2 as the outer edge 2e of the midsole 2 is approached.
- an extension groove 13 is connected to the tip of the vertical groove 10.
- the extension groove 13 in FIG. 3 is curved toward the inner side M of the foot as it goes forward from the tip of the longitudinal groove 10 so as to pass through the first phalanx B11 or its vicinity.
- the part of the longitudinal groove 10 (tip portion), the second lateral groove 12 and the extension groove 13 partition the toe part 1T of the shoe sole and the stepping part by the groove. Therefore, the shoe sole is easily bent in each of the grooves 10, 12, 13 when the foot leaves. As a result, the load center G in FIG. 1C moves along a predetermined kick-out direction.
- the test subject traveled on the track at 3, 5 minutes / km, and the movement trajectory 101 of the load center G during travel was measured.
- the movement trajectory 101 is shown in FIG. 1C.
- the load center G smoothly moves forward along the dividing groove 7, the recess 8, the belt-like region 9, and the longitudinal groove 10.
- the load center G moves forward in the middle foot portion 1M without the movement locus 101 being bent greatly.
- the kicking-out direction of the foot is stable.
- the oblique portion 33 may be formed by a ridge extending along the first direction D1 without forming the second through hole 32.
- the rigidity of the outer side L may be larger than the rigidity of the belt-like region 9 in the middle foot portion 1M. Further, the heel cup 3 and the reinforcing member are formed thinly in the region of the belt-like region 9 without providing the second through hole 32, or the heel cup 3 and the reinforcing member are provided on the lower surface of the midsole 2 in the region of the belt-like region 9. You may make it not adhere
- a gel on part of the midsole 2.
- a sheath-like part or a resin foam may be provided in place of the gel.
- a part of the reinforcing member may be formed of a foam.
- the present invention can be applied to sports shoes worn in daily life, sports and competitions.
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Abstract
Description
しかし、これらの文献に開示された前記樹脂パーツは、足の内外において概ね均等の強度を持つ。また、前記各文献の靴の前足部には縦溝が形成されていない。
また、同文献の靴底は中足部の内外の中央部分に柔軟な帯状領域を有していない。
踵から接地し爪先から離地する歩行や走行の動作において、足裏における荷重の中心は、踵の外側から中足部を通り爪先の内側に至る。この荷重中心の移動軌跡に沿って靴底の下面に溝を設けると、当該溝に荷重中心が導かれ歩行や走行の効率が良くなることが期待される。
しかし、以下に説明するように、荷重中心の移動軌跡は歩行時と走行時とで著しく相違している。
一方、同被験者が同走路上を3.5分/kmで走行し、走行中の荷重中心の移動軌跡101を測定した。その移動軌跡101が図1Bに示される。
歩行と走行では、移動軌跡101が大きく異なる。特に、走行時においては以下の時期およびポイントにおいて、移動軌跡101の滞留やバラツキが認められる。
i) ファーストストライク(着地の瞬間)において、踵の中心付近、
ii)中足部の内側、
iii) 離地において爪先の中心付近。
まず、ファーストストライクについて考察すると、この際の靴底への着地衝撃は大きい。したがって、最初に接地する後足部の外側を大きく変形させて、踵の中心付近に荷重中心を早く導く必要がある。そのためには、踵の中心付近に大きな窪みが必要と考えられる。
踵が着地した後、図1Bのように、荷重中心が前方の中足部に移動すると、足が中足部の内側に向かって倒れ込む。そのため、中足部の内側において移動軌跡101が曲がり、荷重中心が滞留する。この曲がりと滞留は走行効率を著しく低下させる。これを防止ないし抑制するには、中足部に溝100を形成するだけでは殆ど役に立たず、前記足の倒れ込みを抑制することが必要であろうと考えられる。したがって、中足部においてアーチの内側が落ち込むのを防止することで、荷重中心をスムースに前方に導くことができると推測される。
離地する際には、靴底から路面に対し加わる力が小さい。しかし、爪先を蹴り出す方向が安定すれば、走行の効率は向上し易い。
したがって、縦溝の最深部の一部に20mmを超える部分や逆に5mm未満の部分が局部的にあってもよい。
このような観点から、溝の深さは5mm~15mmが好ましく、7mm~13mm程度が最も好ましい。
この場合、MP関節における足の屈曲がスムースになって荷重中心が縦溝に沿って移動し易い。
第2横溝は爪先の趾節間関節の屈曲をスムースにし、離地の際の前記移動軌跡が安定し易いだろう。
この場合、中足部から前足部に荷重中心が縦溝に沿って導かれ易いだろう。
2:ミッドソール
20:ミッドソール本体
21:緩衝要素
2e:外側の縁
2u:上面
2d:下面
20d:下面
3:ヒールカップ
30:支持部
31:第1貫通孔
32:第2貫通孔
33:斜め部
39,49:装着部
4:架設片
5:アウトソール
50:接合面
51:接地面
7:分割溝
8:窪み
9:帯状領域
10:縦溝
11:第1横溝
12:第2横溝
13:延長溝
1F:前足部
1M:中足部
1R:後足部
1Rm:中央部分
1T:爪先部
R:放射方向
Y:前後方向
X:幅方向
D:深さ
W:幅
M:内側
L:外側
C:中央部分
D1:第1方向
D2:第2方向
Δ1:第1隙間
Δ2:第2隙間
G:荷重中心
図10および図11において、本運動靴は足の甲を包むアッパー1、ミッドソール2、ヒールカップ3およびアウトソール5などを備えている。
以下、その構造が詳述される。
図4に示すように、前記縦溝10はその前端から前記中足部1Mに近づくに従い溝の幅Wおよび深さDが徐々に、かつ、滑らかに大きくなる。
前記被験者が前記走路上を3,5分/kmで走行し、走行中の荷重中心Gの移動軌跡101を測定した。その移動軌跡101が図1Cに示される。
Claims (12)
- 効率の良い走行に適した運動靴の靴底であって、
前記靴底は前足部、中足部および後足部が足の前後方向に連なり、かつ、内側、外側および前記内側と前記外側との間の中央部分が足の幅方向に連なり、
上面および下面を有し着地の衝撃を緩衝するミッドソールと、
前記ミッドソールの下方に配置されたアウトソールとを備え、
前記ミッドソールは前記前足部において樹脂の発泡体で形成されたミッドソール本体を有し、
前記アウトソールは前記前足部および後足部に設けられ、
前記中足部は足のアーチを支持し前記中足部に前記アーチの低下を抑制する補強部材が設けられ、
前記後足部において踵骨から前方に延び接地しない窪みが形成され、
前記中足部には前記中央部分において前後方向に延び前記窪みに連なる帯状領域が設けられ、
前記中足部において、前記内側は前記帯状領域および前記外側に比べ上方からの荷重によりミッドソールの上面が下方へ沈みにくくなるように、前記補強部材およびミッドソールが設けられ、
前記前足部において、前記ミッドソール本体およびアウトソールには前記中央部分において前後方向に延び前記帯状領域に連なる縦溝が形成され、
前記縦溝の深さは5mm~20mmであり、
前記縦溝は前記前足部の後端から第2趾の近位趾節間関節まで設けられ、
前記縦溝は前記ミッドソールの前足部の外側の縁に概ね平行となるように湾曲しており、
前記縦溝の幅および深さは、それぞれ、前記窪みの幅および深さよりも小さく、
前記窪み、前記帯状領域および縦溝が前記前後方向に滑らかに連なっている運動靴の靴底。 - 請求項1において、前記後足部の内側および外側に沿って巻き上がった形状を有し前記後足部において足を支持する樹脂の非発泡体からなる支持部材を更に備え、
前記支持部材は前記後足部の中央部分において前記ミッドソールの上面が下方に沈み易くなるのを助けるための貫通部を有している運動靴の靴底。 - 請求項1において、前記後足部から中足部に向かって延び前記中足部において足の内側および外側を支持し、かつ、前記後足部において足の内側および外側を支持する支持部材を更に備え、
前記支持部材は前記中足部において前記補強部材の一部または全部を構成し、
前記支持部材は前記中足部および後足部の中央部分において前記ミッドソールの上面が下方に沈み易くなるのを助けるための貫通部を有している運動靴の靴底。 - 請求項3において、前記ミッドソール本体の前足部の後端と後足部の前端の間には、前記補強部材の一部を構成する架設片が架設され、前記架設片は前記中足部の内側が前記帯状領域に比べ下方に沈みにくくなるのに役立つ運動靴の靴底。
- 請求項3において、前記ミッドソールは前記ミッドソール本体を前記中足部に更に有し、
前記支持部材は前記中足部の内側において前記ミッドソール本体の下面に接合され、かつ、前記中足部の外側において前記ミッドソール本体の下面に接合されずに前記ミッドソール本体の下面から離間している運動靴の靴底。 - 請求項3において、前記支持部材は中足部の前記帯状領域に前記外側から前記内側に行くに従い斜め前方に向かって延びる斜め部を更に備え、
前記斜め部の延びる方向に沿った第1方向への中足部の屈曲は、前記第1方向に直交する第2方向への中足部の屈曲に比べより大きな力が必要となる運動靴の靴底。 - 請求項6において、前記支持部材の貫通部は中足部の帯状領域に前記外側から前記内側に行くに従い斜め前方に向かって延びる複数の互いに平行な貫通孔を包含し、前記貫通孔に沿って前記斜め部が形成された運動靴の靴底。
- 請求項1において、前記前足部には中足趾節関節に沿った第1横溝が前記アウトソールを横断するように設けられ、
前記第1横溝は前記アウトソールが前後に分離されて形成されている運動靴の靴底。 - 請求項8において、前記前足部の外側には第5趾の先端と第3趾の先端との間の位置において前記アウトソールを横断する方向に延びる第2横溝が設けられ、
前記第1横溝に対し前記第2横溝が前記ミッドソールの外側の縁に近づくに従い離れるように形成されている運動靴の靴底。 - 請求項1において、前記縦溝は前記縦溝の前端から前記中足部に近づくに従い溝の幅および深さが徐々に、かつ、滑らかに大きくなるように形成されている運動靴の靴底。
- 請求項1において、前記補強部材は中足部の内側においてミッドソール本体の下面に接合され足の内側を支持する第1部材と、前記中足部の内側において第1部材の下方に配置された第2部材とを備えた運動靴の靴底。
- 請求項1において、前記後足部の外側には前記発泡体よりもヤング率の小さい軟質の緩衝要素が前記ミッドソールの一部として配置され、
前記後足部の外側において、踵の中心から斜め後方に向かって延びる放射方向に沿って前記アウトソールおよび緩衝要素を分割する分割溝が設けられている運動靴の靴底。
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JP2010531662A JP5292652B2 (ja) | 2008-09-30 | 2008-09-30 | 走行効率の良い運動靴の靴底 |
AU2008362408A AU2008362408B2 (en) | 2008-09-30 | 2008-09-30 | Shoe sole of athletic shoe with high running efficiency |
US13/120,562 US8863407B2 (en) | 2008-09-30 | 2008-09-30 | Shoe sole of athletic shoe with high running efficiency |
PCT/JP2008/067710 WO2010038266A1 (ja) | 2008-09-30 | 2008-09-30 | 走行効率の良い運動靴の靴底 |
EP08811345.1A EP2332432B1 (en) | 2008-09-30 | 2008-09-30 | Sole of sports shoes exhibiting good running efficiency |
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JP7500024B2 (ja) | 2022-03-21 | 2024-06-17 | エクスボディ カンパニー,リミテッド | 衝撃吸収層の構造を有する靴底 |
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Also Published As
Publication number | Publication date |
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EP2332432A4 (en) | 2014-01-15 |
US8863407B2 (en) | 2014-10-21 |
JPWO2010038266A1 (ja) | 2012-02-23 |
US20110185590A1 (en) | 2011-08-04 |
AU2008362408B2 (en) | 2013-06-06 |
EP2332432A1 (en) | 2011-06-15 |
JP5292652B2 (ja) | 2013-09-18 |
AU2008362408A1 (en) | 2010-04-08 |
EP2332432B1 (en) | 2016-12-14 |
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