US20020014022A1 - Athletic shoe midsole design and construction - Google Patents
Athletic shoe midsole design and construction Download PDFInfo
- Publication number
- US20020014022A1 US20020014022A1 US09/802,004 US80200401A US2002014022A1 US 20020014022 A1 US20020014022 A1 US 20020014022A1 US 80200401 A US80200401 A US 80200401A US 2002014022 A1 US2002014022 A1 US 2002014022A1
- Authority
- US
- United States
- Prior art keywords
- midsole
- corrugated sheet
- athletic shoe
- heel
- midsole assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000386 athletic effect Effects 0.000 title claims abstract description 62
- 238000010276 construction Methods 0.000 title description 32
- 239000013013 elastic material Substances 0.000 claims abstract description 22
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 26
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 229920001187 thermosetting polymer Polymers 0.000 claims description 12
- 238000003856 thermoforming Methods 0.000 claims description 11
- 229920001169 thermoplastic Polymers 0.000 claims description 11
- 239000004416 thermosoftening plastic Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 210000000474 heel Anatomy 0.000 description 111
- 210000002683 foot Anatomy 0.000 description 11
- 238000005452 bending Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- 210000003371 toe Anatomy 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 230000002459 sustained effect Effects 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 208000002193 Pain Diseases 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000036407 pain Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 102000003786 Vesicle-associated membrane protein 2 Human genes 0.000 description 1
- 108090000169 Vesicle-associated membrane protein 2 Proteins 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 210000003423 ankle Anatomy 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 210000000459 calcaneus Anatomy 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 210000001624 hip Anatomy 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 210000000452 mid-foot Anatomy 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- BWMISRWJRUSYEX-SZKNIZGXSA-N terbinafine hydrochloride Chemical compound Cl.C1=CC=C2C(CN(C\C=C\C#CC(C)(C)C)C)=CC=CC2=C1 BWMISRWJRUSYEX-SZKNIZGXSA-N 0.000 description 1
- 201000004647 tinea pedis Diseases 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Images
Classifications
-
- 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
- A43B13/18—Resilient soles
Definitions
- the present invention relates to an athletic shoe midsole design and construction. More particularly, the invention relates to a midsole assembly where there are provided a midsole formed of soft elastic material and a corrugated sheet disposed in the midsole.
- the sole of an athletic shoe used in various sports is generally comprised of a midsole and an outsole fitted under the midsole, directly contacting the ground.
- the midsole is typically formed of soft elastic material in order to ensure adequate cushioning.
- the applicant of the present invention proposes a midsole assembly having a corrugated sheet therein, which can prevent such an excessive lateral deformation of shoes.
- the midsole assembly shown in the above publication incorporates a corrugated sheet in a heel portion of a midsole and it can produce resistant force preventing the heel portion of a midsole from being deformed laterally or transversely when a shoe contacts the ground. Thus, the transverse deformation of the heel portion of a shoe is prevented.
- the prior art midsole has a constant compressive hardness throughout the midsole and as a result, it cannot control effectively pronation and supination of the foot of an athlete although controlling them is required according to the kind of athletics.
- the heel portion of a midsole tends to be less deformed in the transverse direction.
- the corrugated sheet is formed from high elastic material the heel portion of a midsole tends to be less deformed in the vertical direction as well. Therefore, when a corrugated sheet has a constant wave configuration the heel portion of a midsole where adequate cushioning is required may show less cushioning properties in contacting the ground.
- good cushioning is indispensable requirements of athletic shoes but too high cushioning may absorb an athletic power such as propellant or jumping power of an athlete.
- the object of the present invention is to provide a midsole assembly for an athletic shoe which can prevent the over-pronation and over-supination in landing by preventing the shoe from being deformed in the transverse direction according to the kind of athletics and can not only ensure adequate cushioning but also prevent an athletic power from being lessened.
- the present invention provides a midsole assembly for an athletic shoe and its manufacturing process.
- a midsole assembly comprises a midsole and a corrugated sheet disposed in at least a heel portion of the midsole.
- the midsole is formed of soft elastic material. Either or both amplitude and wavelength of wave configuration of the corrugated sheet is made different either or both between a front end portion and back end portion, and between a medial portion and lateral portion of the heel portion.
- a second embodiment provides a midsole assembly according to the first embodiment, wherein hardness of the corrugated sheet is higher than that of the midsole.
- a third embodiment provides a midsole assembly according to the first embodiment, wherein the corrugated sheet is comprised of fiber-reinforced plastic.
- a fourth embodiment provides a midsole assembly according to the third embodiment, wherein the fibers of the fiber-reinforced plastic are aligned in one direction.
- a fifth embodiment provides a midsole assembly according to the fourth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented to the direction coinciding with the direction of ridges of the wave configuration.
- a sixth embodiment provides a midsole assembly according to the fourth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented within ⁇ 30° relative to the direction of ridges of the wave configuration.
- a seventh embodiment provides a midsole assembly according to the third embodiment, wherein the fibers of the fiber-reinforced plastic are woven by filling and warp, the modulus of elasticity of the filling being greater than or equal to that of the warp.
- An eighth embodiment provides a midsole assembly according to the seventh embodiment, wherein the filling being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- a ninth embodiment provides a midsole assembly according to the seventh embodiment, wherein the filling being oriented within ⁇ 30° relative to the direction of ridges of the wave configuration.
- a tenth embodiment provides a midsole assembly according to the first embodiment, wherein a plurality of ribs are provided on the surface of the corrugated sheet, the ribs being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- An eleventh embodiment provides a midsole assembly according to the first embodiment, wherein the corrugated sheet is comprised of a first corrugated sheet and a second corrugated sheet, the first corrugated sheet being formed of thermoplastic or thermosetting resin, the circumferential end surface thereof being located inside the side surface of the heel portion of a shoe, the second corrugated sheet being formed of soft elastic material having smaller modulus of elasticity than that of the first corrugated sheet, the circumferential end surface thereof being located at substantially the same position as the side surface of the heel portion of a shoe.
- a midsole assembly comprises a midsole and a corrugated sheet disposed in at least a heel portion of the midsole.
- the midsole is formed of soft elastic material and has an aperture in the heel central portion. Either or both amplitude and wavelength of wave configuration of the corrugated sheet is made different either or both between a front end portion and back end portion, and between a medial portion and lateral portion of the heel portion.
- a thirteenth embodiment provides a midsole assembly according to the twelfth embodiment, wherein hardness of the corrugated sheet is higher than that of the midsole.
- a fourteenth embodiment provides a midsole assembly according to the twelfth embodiment, wherein the corrugated sheet is comprised of fiber-reinforced plastic.
- a fifteenth embodiment provides a midsole assembly according to the fourteenth embodiment, wherein the fibers of the fiber-reinforced plastic are aligned in one direction.
- a sixteenth embodiment provides a midsole assembly according to the fifteenth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented to the direction coinciding with the direction of ridges of the wave configuration.
- a seventeenth embodiment provides a midsole assembly according to the fifteenth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented within ⁇ 30° relative to the direction of ridges of the wave configuration.
- An eighteenth embodiment provides a midsole assembly according to the fourteenth embodiment, wherein the fibers of the fiber-reinforced plastic are woven by filling and warp, the modulus of elasticity of the filling being greater than or equal to that of the warp.
- a nineteenth embodiment provides a midsole assembly according to the eighteenth embodiment, wherein the filling being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- a twentieth embodiment provides a midsole assembly according to the eighteenth embodiment, wherein the filling being oriented within ⁇ 30° relative to the direction of ridges of the wave configuration.
- a twenty-first embodiment provides a midsole assembly according to the twelfth embodiment, wherein a plurality of ribs are provided on the surface of the corrugated sheet, the ribs being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- a twenty-second embodiment provides a midsole assembly according to the twelfth embodiment, wherein the corrugated sheet is comprised of a first corrugated sheet and a second corrugated sheet, the first corrugated sheet being formed of thermoplastic or thermosetting resin, the circumferential end surface thereof being located inside the side surface of the heel portion of a shoe, the second corrugated sheet being formed of soft elastic material having smaller modulus of elasticity than that of the first corrugated sheet, the circumferential end surface thereof being located at substantially the same position as the side surface of the heel portion of a shoe.
- a process for forming a midsole assembly for an athletic shoe wherein a corrugated sheet is disposed in at least a heel portion of a midsole.
- the process comprises the steps of overlaying a first flat sheet on a second flat sheet, where the first flat sheet is formed of thermoplastic or thermosetting resin and the circumferential end surface thereof is located inside the side surface of the heel portion of a shoe, and the second flat sheet is formed of soft elastic material having smaller modulus of elasticity than that of the first flat sheet and the circumferential end surface thereof is located at substantially the same position as the side surface of the heel portion; and forming the first and second flat sheets into corrugated sheets by placing the first and second flat sheets in a mold and thermoforming them.
- FIG. 1 is a side view of an athletic shoe incorporating the present invention midsole construction.
- FIG. 2 is an exploded, perspective view of a portion of the midsole construction of the present invention.
- FIG. 3 is a perspective view of a portion of a corrugated sheet in the midsole construction of the present invention.
- FIG. 4 is a side sectional view of the corrugated sheet.
- FIG. 5 is a graph showing the relations between moment of inertia of area I, wavelength ⁇ and amplitude A of the corrugated sheet.
- FIG. 6 is a graph showing the relations between bending rigidity EI and cushioning coefficient C of the midsole having a corrugated sheet therein.
- FIGS. 7 - 12 are schematics illustrating a forming process of the midsole construction of the present invention.
- FIGS. 13 - 19 are schematics illustrating the midsole construction of the present invention.
- (a) is a top plan view of the midsole construction of a left side shoe;
- (b) is an outside side view thereof;
- (c) is an inside side view thereof.
- FIG. 20 is a perspective view of a portion of a corrugated sheet in the midsole construction of the another embodiment of the present invention.
- FIG. 21 is a schematic illustrating the midsole construction of the alternative embodiment of the present invention.
- (a) is a plantar view of the midsole construction of a left side shoe;
- (b) is a sectional view taken along the line X-X.
- FIG. 22 is a schematic illustrating maximum pressures by the contour lines, forced against the sole of a human foot while his or her running.
- FIG. 1 illustrates an athletic shoe incorporating a midsole construction of the present invention.
- the sole of this athletic shoe 1 comprises a midsole 3 , a corrugated sheet 4 and an outsole 5 directly contacting the ground.
- the midsole 3 is fitted to the bottom of uppers 2 .
- the corrugated sheet 4 is disposed in the midsole 3 .
- the outsole 5 is fitted to the bottom of the midsole 3 .
- the midsole 3 is provided in order to absorb a shock load imparted on the heel portion of the shoe 1 when landing on the ground. As shown also in FIG. 2, the midsole 3 is comprised of an upper midsole 3 a and a lower midsole 3 b which are respectively disposed on the top and bottom surfaces of the corrugated sheet 4 .
- the midsole 3 is generally formed of soft elastic material having good cushioning properties. Specifically, thermoplastic synthetic resin foam such as ethylene-vinyl acetate copolymer (EVA), thermosetting resin foam such as polyurethane (PU), or rubber material foam such as butadiene or chloroprene rubber are used.
- EVA ethylene-vinyl acetate copolymer
- PU polyurethane
- rubber material foam such as butadiene or chloroprene rubber
- foam having about 1-100 kg/cm 2 , preferably about 10 kg/cm 2 , of the modulus of elasticity is utilized as the foam for forming the midsole 3 .
- the corrugated sheet 4 is formed of thermoplastic resin such as thermoplastic polyurethane (TPU) of comparatively rich elasticity, polyamide elastomer (PAE), ABS resin and the like.
- thermoplastic resin such as thermoplastic polyurethane (TPU) of comparatively rich elasticity, polyamide elastomer (PAE), ABS resin and the like.
- thermosetting resin such as epoxy resin, unsaturated polyester resin and the like.
- thermoplastic polyurethane sheet of about 1 mm thickness, having about 100-50000 kg/cm 2 , preferably about 1000 kg/cm 2 , of the modulus of elasticity is utilized as the corrugated sheet 4 .
- the corrugated sheet 4 is interposed between the upper midsole 3 a and the lower midsole 3 b , and the sheet 4 is integrated with the midsole 3 a and 3 b.
- the compressive hardness is determined by bending rigidity EI (E: Young's modulus, I: moment of inertia of area) of the material forming the corrugated sheet 4 .
- This equation 3 shows that moment of inertia of area I is proportional to the square of amplitude A but wavelength ⁇ does not influence moment of inertia of area I at all when wavelength ⁇ is adequately large compared to amplitude A.
- This equation 4 shows that moment of inertia of area I is proportional to the cube of amplitude A and inversely proportional to wavelength ⁇ when wavelength ⁇ is adequately small compared to amplitude A.
- influence of amplitude A and wavelength ⁇ upon moment of inertia of area I would be the intermediate between the above equations 3 and 4. In either case, influence of amplitude A upon moment of inertia of area I is extremely large compared to wavelength ⁇ .
- FIG. 6 shows the relation between bending rigidity EI and cushioning properties.
- C axis of ordinate represents cushioning coefficient.
- the cushioning coefficient C represents cushioning properties of the midsole 3 having the corrugated sheet 4 therein.
- the coefficient C is a comparative value when compressive deformation of a midsole 3 without a corrugated sheet, to which a predetermined load is applied, is the basic value of 100.
- the cushioning coefficient C becomes smaller and cushioning properties become poor, but stability is improved.
- compressive hardness of the whole midsole construction is generally determined by the amplitude A rather than the wavelength ⁇ of the corrugated sheet 4
- regulation of compressive hardness may be made solely by the amplitude A
- regulation of the bending deformation properties of the midsole construction i.e. how the midsole construction deforms in landing along the ridge line or ravine line of the wave configuration of the corrugated sheet
- a flat sheet 3 b ′ (see FIG. 7) of about 10-20 mm thickness, made of soft elastic material, is cut along the circumference of the heel of an athletic shoe.
- This flat sheet 3 b ′ will constitute the lower midsole 3 b after forming process has been completed.
- a flat sheet 4 ′ (see FIG. 7) of about 0.5-2 mm thickness, made of thermoplastic or thermosetting resin, is cut into a slightly smaller circumferential configuration than that of the heel.
- This flat sheet 4 ′ will constitute the substantial (or functional) corrugated sheet 4 after forming.
- a flat sheet 4 ′′ (see FIG. 7) of about 0.5-2 mm thickness, made of soft elastic material, is cut along the circumference of the heel. This flat sheet 4 ′′ will constitute the seeming (or appearing) corrugated sheet 4 after forming.
- the flat sheet 4 ′′ has preferably different color or design from that of the flat sheet 3 b ′ such that the circumferential end surface of the flat sheet 4 ′′ can be distinguished from that of the lower midsole 3 b after forming process has been completed.
- the flat sheets 4 ′ and 4 ′′ are bonded onto the upper surface of the flat sheet 3 b ′ (see FIG. 7) and then, as shown in FIG. 8, these flat sheets 3 b ′, 4 ′ and 4 ′′ are inserted into a cavity 10 a of a mold 10 .
- the flat sheets 4 ′ and 4 ′′ are placed on the flat sheet 3 b ′ sequentially, but the flat sheets 4 ′ and 4 ′′ may be adversely placed.
- FIGS. 7 and 8 also in FIGS. 9 to 12
- each thickness of the flat sheets 4 ′ and 4 ′′ is shown exaggeratingly for the purpose of clarification.
- the outer measurement d 1 of the flat sheets 3 b ′ and 4 ′′ is larger than the inner measurement D of the cavity 10 a .
- the flat sheets 3 b ′ and 4 ′′ formed of soft elastic material have smaller modulus of elasticity and are easy to be deformed, these flat sheets 3 b ′ and 4 ′′ are easy to be inserted into the cavity 10 a.
- the flat sheet 4 ′ formed of thermoplastic or thermosetting resin has larger modulus of elasticity and is hard to be deformed.
- the outer measurement d 2 of the flat sheet 4 ′ is slightly smaller than the inner measurement D of the cavity 10 a , the flat sheet 4 ′ is also easy to be inserted into the cavity 10 a.
- the mold 12 having a corrugated bottom surface 12 a is inserted into the cavity 10 a of the mold 10 , and then pressed and heated.
- the mold 12 has returned after this thermoforming, as shown in FIG. 10, the lower midsole 3 b having a corrugated upper surface is obtained and also, the corrugated sheet 4 formed of the flat sheets 4 ′ and 4 ′′ is obtained.
- a flat sheet of about 10-20 mm thickness, made of soft elastic material, is cut along the circumference of the heel of an athletic shoe, as in the case of forming the lower midsole 3 b . Then, by inserting this cut sheet into a mold set, one of which has a corrugated surface, pressing and heating it, the upper midsole 3 a having a flat top surface and a corrugated bottom surface is formed through thermoforming.
- the maximum thickness of the upper midsole 3 a after forming is set about 10-15 mm.
- the circumferential end surface of the flat sheet 4 ′ is reced ed inwardly from the circumferential end surfaces of the flat sheets 3 b ′ and 4 ′′. Therefore, after thermoforming, the circumferential end surface of the flat sheet 4 ′ constituting the substantial corrugated sheet 4 is buried inside the circumferential end surfaces of the lower midsole 3 b and flat sheet 4 ′′, and hard to be distinguished from outside.
- the circumferential end surface of the flat sheet 4 ′′ contacting tightly with the flat sheet 4 ′ is placed at the same position as the side surface of the heel, and besides, the flat sheet 4 ′′ has a different color or design from that of the lower midsole 3 b .
- the consumers and users of shoes can distinguish the corrugated sheet by the existence of the sheet 4 ′′ and as a result, aesthetic impression of shoes will be improved.
- the corrugated sheet 4 is comprised of the flat sheet 4 ′ formed of thermoplastic or thermosetting resin and the flat sheet 4 ′′ formed of soft elastic material.
- the corrugated sheet 4 may be comprised solely of the flat sheet 4 ′.
- the circumferential end surface of the formed flat sheet 4 ′ or the corrugated sheet 4 should be preferably seen from outside.
- the flat sheet 4 ′ has larger modulus of elasticity and is hard to deform, the outer circumference of the enlarged flat sheet 4 ′ cannot enter the cavity of a mold and as a result, burrs will occur around the outer circumference of the formed flat sheet 4 ′. Therefore, in this case, removal procedures of the burrs are required.
- the corrugated sheet 4 may be interposed between the lower corrugated surface of the upper midsole 3 a and the upper corrugated surface of the lower midsole 3 b , and the sheet 4 may be bonded between the midsoles 3 a and 3 b.
- a flat sheet of about 10-20 mm thickness, formed of soft elastic material, is cut along the circumferential configuration of the heel.
- the upper midsole 3 a having a generally flat upper surface and a corrugated bottom surface is formed through thermoforming.
- the maximum thickness of the formed upper midsole 3 a is set about 5-7 mm.
- a flat sheet of about 10-20 mm thickness, formed of soft elastic material, is cut along the circumferential configuration of the heel. Then, by inserting this cut flat sheet into a mold set, one of which has a corrugated surface, and pressing and heating it, the lower midsole 3 b having a generally flat bottom surface and a corrugated upper surface is formed through thermoforming. The maximum thickness of the formed lower midsole 3 b is set about 10-15 mm.
- the corrugated sheet 4 may be formed through either thermoforming or injection molding.
- thermoforming by inserting such a laminate of the flat sheets 4 ′ and 4 ′′ (or only the flat sheet 4 ′) as was explained in the method 1 into a mold set, both of which have corrugated surfaces, and pressing and heating it, the corrugated sheet 4 is obtained.
- injection molding by introducing the molten thermoplastic resin into the injection mold having a corrugated surface, the corrugated sheet 4 is obtained.
- the method 3 is entirely different from the abovementioned methods 1 and 2.
- the corrugated sheet 4 is formed by thermoforming or injection molding and the formed corrugated sheet 4 is placed in a mold. Then, premixed polyurethane foam material is introduced into the mold and foamed in it. Thus, the upper midsole 3 a and lower midsole 3 b are formed integral with the upper and lower surfaces of the corrugated sheet 4 and the midsole construction is completed.
- a shoe sole is constituted by bonding the outsole 5 on the bottom surface of the lower midsole 3 b .
- the outsole 5 is mainly comprised of solid rubber and its landing surface has a plurality of slip preventive grooves or projections.
- a shank member made of hard rigid resin or metal may be installed on the medial and lateral portions of the midfoot portion (or the arch portion) of the midsole construction in order to increase rigidity.
- a member such as a stabilizer and the like may be provided between the upper midsole 3 a and the vamp 2 so as to improve the stability of the heel portion.
- FIGS. 13 - 22 there are shown various kinds of midsole constructions of the present invention.
- a 1 the amplitude at the heel front end portion of the wave configuration of the corrugated sheet 4 ;
- a 2 the amplitude at the heel back end portion of the wave configuration of the corrugated sheet 4 .
- Ao the amplitude at the heel lateral portion of the wave configuration of the corrugated sheet 4 .
- ⁇ i the wavelength at the heel medial portion of wave configuration of the corrugated sheet 4 ;
- ⁇ o the wavelength at the heel lateral portion of wave configuration of the corrugated sheet 4 .
- the wavelength of wave configuration of the corrugated sheet 4 is greater at the heel medial portion and smaller at the heel lateral portion.
- the load path (or the load carrying path) can nearly coincide with the direction perpendicular to each ridge line of wave configuration.
- the direction of each ridge line or generating line is shown by x in FIG. 3 and the direction perpendicular to each ridge line or director line is shown by z in FIG. 3.
- the midsole 3 deforms along the ridge lines or ravine lines of wave configuration when landing.
- the wavelength of wave configuration of the corrugated sheet 4 is greater at the heel lateral portion and smaller at the heel medial portion.
- the load path can nearly coincide with the direction perpendicular to each ridge line of wave configuration.
- the wavelength of wave configuration of the corrugated sheet 4 is greater at the heel lateral portion and smaller at the heel medial portion. Therefore, in the athletics where athletes land more frequently at their heel medial portions, when they land on the ground from the heel portions toward the toe portions of the shoes in sequence, the load path can nearly coincide with the direction perpendicular to each ridge line of wave configuration. That is to say, the midsole 3 deforms along the ridge lines or ravine lines of wave configuration when landing.
- the wavelength of wave configuration of the corrugated sheet 4 is greater at the heel medial portion and smaller at the heel lateral portion. Therefore, in the athletics where athletes land more frequently at their heel lateral portions, when they land on the ground from the heel portions toward the toe portions of the shoes in sequence, the load path can nearly coincide with the direction perpendicular to each ridge line of wave configuration. As a result, the transverse deformation and the over-supination at the heel portion can be securely prevented and the larger contact area can be secured when landing. Thus, grip properties and wear resistant properties can be improved.
- the corrugated sheet 4 of each of the abovementioned embodiments has a higher hardness than that of the midsole 3 .
- the corrugated sheet 4 repeats deformation with the midsole 3 .
- the midsole 3 gradually loses its elasticity and it becomes easy to be worn.
- hardness of the corrugated sheet 4 is set higher, the midsole 3 becomes hard to be worn due to the restorative properties of the corrugated sheet 4 .
- shock load in landing can be relieved during a prolonged use and cushioning can be secured.
- the corrugated sheet 4 of each of the abovementioned embodiments is formed of the fiber reinforced plastic (FRP).
- FRP fiber reinforced plastic
- the fiber reinforced plastic (FRP) is comprised of reinforcement fiber and matrix resin.
- Reinforcement fiber may be carbon fiber, aramid fiber, glass fiber and the like.
- Matrix resin may be thermoplastic or thermosetting resin.
- each fiber of FRP in the above embodiment is oriented to the direction coinciding with the ridge direction of wave configuration of the corrugated sheet 4 .
- elasticity in the ridge direction can be selectively improved without excessively increasing elasticity in the direction perpendicular to the ridge line.
- FRP fiber is aligned in one direction.
- FRP fiber is plain weave woven by a filling and warp.
- the modulus of elasticity of the filling is greater than or equal to that of the warp and the filling is oriented to the direction coinciding with the ridge direction of wave configuration of the corrugated sheet 4 .
- FRP fiber is aligned in one direction and the fiber is, preferably, oriented to the direction within ⁇ 30° with relation to the ridge direction of wave configuration of the corrugated sheet 4 .
- the fiber is woven by the filling and warp, and the modulus of elasticity of the filling is greater than or equal to that of the warp, and the filling is oriented to the direction within ⁇ 30° with relation to the ridge direction of the wave configuration of the corrugated sheet 4 .
- each ridge line direction is not respectively parallel as in the embodiments shown in FIGS. 15 and 16, the directions of aligned fibers and the filling should be oriented coinciding with the ridge line direction running through the general center line of the heel portion, and be oriented to the direction within ⁇ 30° with relation to the other ridge line directions.
- FIG. 22 shows the maximum pressures by contour lines, forced upon the plantar of a foot during running or jogging. As seen from FIG. 22, the maximum forces are imparted to the central region of the heel portion. Therefore, adequate cushioning is required in the central region of the heel portion.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
A midsole assembly for an athletic shoe comprising a midsole and a corrugated sheet. The midsole is formed of soft elastic material. The corrugated sheet is disposed in at least a heel portion of the midsole. Either or both amplitude and wavelength of wave configuration of said corrugated sheet are made different either or both between a front end portion and back end portion, and between an medial portion and lateral portion of said heel portion.
Description
- The present invention relates to an athletic shoe midsole design and construction. More particularly, the invention relates to a midsole assembly where there are provided a midsole formed of soft elastic material and a corrugated sheet disposed in the midsole.
- The sole of an athletic shoe used in various sports is generally comprised of a midsole and an outsole fitted under the midsole, directly contacting the ground. The midsole is typically formed of soft elastic material in order to ensure adequate cushioning.
- Running stability as well as adequate cushioning is required in athletic shoes. There is need to prevent shoes from being deformed excessively in the lateral or transverse direction when contacting the ground.
- As shown in Japanese Utility Model Examined Publication No. 61-6804, the applicant of the present invention proposes a midsole assembly having a corrugated sheet therein, which can prevent such an excessive lateral deformation of shoes.
- The midsole assembly shown in the above publication incorporates a corrugated sheet in a heel portion of a midsole and it can produce resistant force preventing the heel portion of a midsole from being deformed laterally or transversely when a shoe contacts the ground. Thus, the transverse deformation of the heel portion of a shoe is prevented.
- However, it depends on the kind of athletics or athletes whether an athlete lands on the ground more frequently from the medial portion or the lateral portion of the heel at the onset of landing. For example, since tennis or basketball players move more often in the transverse direction and the medial portions of their heels tend to first contact the ground, the heels lean outwardly and so-called supination often occurs. On the other hand, since runners or joggers tend to land on the ground from the lateral portions of their heels and the load moves toward the toes, the heels lean inwardly and so-called pronation often occurs.
- These pronation and supination are normal movements when an athlete's foot comes in contact with the ground. But over-pronation or over-supination may cause damages to the ankle, knee and hip of an athlete.
- In the conventional midsole design there is provided a corrugated sheet having a constant wave configuration in both the transverse direction and the longitudinal direction of the heel portion. Therefore, the prior art midsole has a constant compressive hardness throughout the midsole and as a result, it cannot control effectively pronation and supination of the foot of an athlete although controlling them is required according to the kind of athletics.
- Generally, by inserting a corrugated sheet the heel portion of a midsole tends to be less deformed in the transverse direction. When the corrugated sheet is formed from high elastic material the heel portion of a midsole tends to be less deformed in the vertical direction as well. Therefore, when a corrugated sheet has a constant wave configuration the heel portion of a midsole where adequate cushioning is required may show less cushioning properties in contacting the ground.
- On the other hand, good cushioning is indispensable requirements of athletic shoes but too high cushioning may absorb an athletic power such as propellant or jumping power of an athlete.
- The object of the present invention is to provide a midsole assembly for an athletic shoe which can prevent the over-pronation and over-supination in landing by preventing the shoe from being deformed in the transverse direction according to the kind of athletics and can not only ensure adequate cushioning but also prevent an athletic power from being lessened.
- The present invention provides a midsole assembly for an athletic shoe and its manufacturing process.
- In one embodiment, a midsole assembly comprises a midsole and a corrugated sheet disposed in at least a heel portion of the midsole. The midsole is formed of soft elastic material. Either or both amplitude and wavelength of wave configuration of the corrugated sheet is made different either or both between a front end portion and back end portion, and between a medial portion and lateral portion of the heel portion.
- A second embodiment provides a midsole assembly according to the first embodiment, wherein hardness of the corrugated sheet is higher than that of the midsole.
- A third embodiment provides a midsole assembly according to the first embodiment, wherein the corrugated sheet is comprised of fiber-reinforced plastic.
- A fourth embodiment provides a midsole assembly according to the third embodiment, wherein the fibers of the fiber-reinforced plastic are aligned in one direction.
- A fifth embodiment provides a midsole assembly according to the fourth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented to the direction coinciding with the direction of ridges of the wave configuration.
- A sixth embodiment provides a midsole assembly according to the fourth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented within ±30° relative to the direction of ridges of the wave configuration.
- A seventh embodiment provides a midsole assembly according to the third embodiment, wherein the fibers of the fiber-reinforced plastic are woven by filling and warp, the modulus of elasticity of the filling being greater than or equal to that of the warp.
- An eighth embodiment provides a midsole assembly according to the seventh embodiment, wherein the filling being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- A ninth embodiment provides a midsole assembly according to the seventh embodiment, wherein the filling being oriented within ±30° relative to the direction of ridges of the wave configuration.
- A tenth embodiment provides a midsole assembly according to the first embodiment, wherein a plurality of ribs are provided on the surface of the corrugated sheet, the ribs being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- An eleventh embodiment provides a midsole assembly according to the first embodiment, wherein the corrugated sheet is comprised of a first corrugated sheet and a second corrugated sheet, the first corrugated sheet being formed of thermoplastic or thermosetting resin, the circumferential end surface thereof being located inside the side surface of the heel portion of a shoe, the second corrugated sheet being formed of soft elastic material having smaller modulus of elasticity than that of the first corrugated sheet, the circumferential end surface thereof being located at substantially the same position as the side surface of the heel portion of a shoe.
- In a twelfth embodiment, a midsole assembly comprises a midsole and a corrugated sheet disposed in at least a heel portion of the midsole. The midsole is formed of soft elastic material and has an aperture in the heel central portion. Either or both amplitude and wavelength of wave configuration of the corrugated sheet is made different either or both between a front end portion and back end portion, and between a medial portion and lateral portion of the heel portion.
- A thirteenth embodiment provides a midsole assembly according to the twelfth embodiment, wherein hardness of the corrugated sheet is higher than that of the midsole.
- A fourteenth embodiment provides a midsole assembly according to the twelfth embodiment, wherein the corrugated sheet is comprised of fiber-reinforced plastic.
- A fifteenth embodiment provides a midsole assembly according to the fourteenth embodiment, wherein the fibers of the fiber-reinforced plastic are aligned in one direction.
- A sixteenth embodiment provides a midsole assembly according to the fifteenth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented to the direction coinciding with the direction of ridges of the wave configuration.
- A seventeenth embodiment provides a midsole assembly according to the fifteenth embodiment, wherein the fibers of the fiber-reinforced plastic are oriented within ±30° relative to the direction of ridges of the wave configuration.
- An eighteenth embodiment provides a midsole assembly according to the fourteenth embodiment, wherein the fibers of the fiber-reinforced plastic are woven by filling and warp, the modulus of elasticity of the filling being greater than or equal to that of the warp.
- A nineteenth embodiment provides a midsole assembly according to the eighteenth embodiment, wherein the filling being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- A twentieth embodiment provides a midsole assembly according to the eighteenth embodiment, wherein the filling being oriented within ±30° relative to the direction of ridges of the wave configuration.
- A twenty-first embodiment provides a midsole assembly according to the twelfth embodiment, wherein a plurality of ribs are provided on the surface of the corrugated sheet, the ribs being oriented to the direction coinciding with the direction of ridges of the wave configuration.
- A twenty-second embodiment provides a midsole assembly according to the twelfth embodiment, wherein the corrugated sheet is comprised of a first corrugated sheet and a second corrugated sheet, the first corrugated sheet being formed of thermoplastic or thermosetting resin, the circumferential end surface thereof being located inside the side surface of the heel portion of a shoe, the second corrugated sheet being formed of soft elastic material having smaller modulus of elasticity than that of the first corrugated sheet, the circumferential end surface thereof being located at substantially the same position as the side surface of the heel portion of a shoe.
- In a twenty-third embodiment, there is provided a process for forming a midsole assembly for an athletic shoe wherein a corrugated sheet is disposed in at least a heel portion of a midsole. In this embodiment, the process comprises the steps of overlaying a first flat sheet on a second flat sheet, where the first flat sheet is formed of thermoplastic or thermosetting resin and the circumferential end surface thereof is located inside the side surface of the heel portion of a shoe, and the second flat sheet is formed of soft elastic material having smaller modulus of elasticity than that of the first flat sheet and the circumferential end surface thereof is located at substantially the same position as the side surface of the heel portion; and forming the first and second flat sheets into corrugated sheets by placing the first and second flat sheets in a mold and thermoforming them.
- For a better understanding of these and other embodiments of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
- For a more complete understanding of the invention, reference should be made to the embodiments illustrated in greater detail in the accompanying drawings and described below by way of examples of the invention. In the drawings, which are not to scale:
- FIG. 1 is a side view of an athletic shoe incorporating the present invention midsole construction.
- FIG. 2 is an exploded, perspective view of a portion of the midsole construction of the present invention.
- FIG. 3 is a perspective view of a portion of a corrugated sheet in the midsole construction of the present invention.
- FIG. 4 is a side sectional view of the corrugated sheet.
- FIG. 5 is a graph showing the relations between moment of inertia of area I, wavelength λ and amplitude A of the corrugated sheet.
- FIG. 6 is a graph showing the relations between bending rigidity EI and cushioning coefficient C of the midsole having a corrugated sheet therein.
- FIGS.7-12 are schematics illustrating a forming process of the midsole construction of the present invention.
- FIGS.13-19 are schematics illustrating the midsole construction of the present invention. In each Figure, (a) is a top plan view of the midsole construction of a left side shoe; (b) is an outside side view thereof; (c) is an inside side view thereof.
- FIG. 20 is a perspective view of a portion of a corrugated sheet in the midsole construction of the another embodiment of the present invention.
- FIG. 21 is a schematic illustrating the midsole construction of the alternative embodiment of the present invention. In the Figure, (a) is a plantar view of the midsole construction of a left side shoe; (b) is a sectional view taken along the line X-X.
- FIG. 22 is a schematic illustrating maximum pressures by the contour lines, forced against the sole of a human foot while his or her running.
- Turning now to the drawings, FIG. 1 illustrates an athletic shoe incorporating a midsole construction of the present invention. The sole of this
athletic shoe 1 comprises amidsole 3, acorrugated sheet 4 and anoutsole 5 directly contacting the ground. Themidsole 3 is fitted to the bottom ofuppers 2. Thecorrugated sheet 4 is disposed in themidsole 3. Theoutsole 5 is fitted to the bottom of themidsole 3. - The
midsole 3 is provided in order to absorb a shock load imparted on the heel portion of theshoe 1 when landing on the ground. As shown also in FIG. 2, themidsole 3 is comprised of anupper midsole 3 a and alower midsole 3 b which are respectively disposed on the top and bottom surfaces of thecorrugated sheet 4. - The
midsole 3 is generally formed of soft elastic material having good cushioning properties. Specifically, thermoplastic synthetic resin foam such as ethylene-vinyl acetate copolymer (EVA), thermosetting resin foam such as polyurethane (PU), or rubber material foam such as butadiene or chloroprene rubber are used. - When the midsole construction of the present invention is applied to a typical athletic shoe, foam having about 1-100 kg/cm2, preferably about 10 kg/cm2, of the modulus of elasticity is utilized as the foam for forming the
midsole 3. - The
corrugated sheet 4 is formed of thermoplastic resin such as thermoplastic polyurethane (TPU) of comparatively rich elasticity, polyamide elastomer (PAE), ABS resin and the like. Alternatively, thecorrugated sheet 4 is formed of thermosetting resin such as epoxy resin, unsaturated polyester resin and the like. - For example, when the midsole construction of the present invention is applied to a typical athletic shoe a thermoplastic polyurethane sheet of about 1 mm thickness, having about 100-50000 kg/cm2, preferably about 1000 kg/cm2, of the modulus of elasticity is utilized as the
corrugated sheet 4. - As described above, in the present invention midsole construction the
corrugated sheet 4 is interposed between theupper midsole 3 a and thelower midsole 3 b, and thesheet 4 is integrated with themidsole - In this midsole construction the pressure imparted from the
upper midsole 3 a in landing is dispersed by thecorrugated sheet 4 and the pressured area of thelower midsole 3 b becomes enlarged. As a result, compressive hardness throughout the midsole construction is made higher. - Generally, the compressive hardness is determined by bending rigidity EI (E: Young's modulus, I: moment of inertia of area) of the material forming the
corrugated sheet 4. - Now, as shown in FIG. 3, take the coordinate system over the
corrugated sheet 4 and consider that the bending moment M around the z-axis is imparted to thecorrugated sheet 4. - Supposing the
corrugated sheet 4 is formed by bending a sheet of t in thickness into sine curved configuration of amplitude A and wavelength λ, the vertical cross sectional view of thecorrugated sheet 4 is shown in FIG. 4. The wave configuration of this cross section can be expressed by thefollowing equation 1. - When there is a relation of L=nλ (L: the whole length of the
corrugated sheet 4, n: natural number), the neutral axis of this section is y=0. The moment of inertia of area I of this section with relation to the neutral axis can be expressed by thefollowing equation 2 when a minute area on the section is ds. - The relations between wavelength λ, amplitude A and moment of inertia of area I are shown in FIG. 5 as t=1 (mm), L=100 (mm). As seen from FIG. 5, amplitude A solely contributes moment of inertia of area I and wavelength λ seldom does when wavelength λ exceeds a certain value.
-
- This
equation 3 shows that moment of inertia of area I is proportional to the square of amplitude A but wavelength λ does not influence moment of inertia of area I at all when wavelength λ is adequately large compared to amplitude A. -
- This
equation 4 shows that moment of inertia of area I is proportional to the cube of amplitude A and inversely proportional to wavelength λ when wavelength λ is adequately small compared to amplitude A. - In fact, influence of amplitude A and wavelength λ upon moment of inertia of area I would be the intermediate between the
above equations - Next, FIG. 6 shows the relation between bending rigidity EI and cushioning properties. In FIG. 6, C axis of ordinate represents cushioning coefficient. The cushioning coefficient C represents cushioning properties of the
midsole 3 having thecorrugated sheet 4 therein. The coefficient C is a comparative value when compressive deformation of amidsole 3 without a corrugated sheet, to which a predetermined load is applied, is the basic value of 100. As seen from FIG. 6, as the bending rigidity EI becomes larger, the cushioning coefficient C becomes smaller and cushioning properties become poor, but stability is improved. - Therefore, where stability on landing is required in the
midsole 3 the compressive hardness should be increased by enlarging the moment of inertia of area I and thus the bending rigidity EI through enlarging the amplitude A and decreasing the wavelength λ. On the contrary, where cushioning properties on landing are required in themidsole 3 the compressive hardness should be decreased by decreasing the moment of inertia of area I and thus the bending rigidity EI through decreasing the amplitude A and enlarging the wavelength λ. - In this way, by properly adjusting amplitude A and wavelength λ, bending rigidity EI can be adjusted, and thus compressive hardness of the whole midsole construction will come to be adjusted.
- Alternatively, since compressive hardness of the whole midsole construction is generally determined by the amplitude A rather than the wavelength λ of the
corrugated sheet 4, regulation of compressive hardness may be made solely by the amplitude A, and regulation of the bending deformation properties of the midsole construction (i.e. how the midsole construction deforms in landing along the ridge line or ravine line of the wave configuration of the corrugated sheet) may be made by the wavelength λ. - Necessary procedures for forming the above midsole construction are as follows. The values in the following description are merely examples and the present invention is not limited to these examples.
- First, a
flat sheet 3 b′ (see FIG. 7) of about 10-20 mm thickness, made of soft elastic material, is cut along the circumference of the heel of an athletic shoe. Thisflat sheet 3 b′ will constitute thelower midsole 3 b after forming process has been completed. - Then, a
flat sheet 4′ (see FIG. 7) of about 0.5-2 mm thickness, made of thermoplastic or thermosetting resin, is cut into a slightly smaller circumferential configuration than that of the heel. Thisflat sheet 4′ will constitute the substantial (or functional)corrugated sheet 4 after forming. Aflat sheet 4″ (see FIG. 7) of about 0.5-2 mm thickness, made of soft elastic material, is cut along the circumference of the heel. Thisflat sheet 4″ will constitute the seeming (or appearing)corrugated sheet 4 after forming. - In addition, the
flat sheet 4″ has preferably different color or design from that of theflat sheet 3 b′ such that the circumferential end surface of theflat sheet 4″ can be distinguished from that of thelower midsole 3 b after forming process has been completed. - Second, the
flat sheets 4′ and 4″ are bonded onto the upper surface of theflat sheet 3 b′ (see FIG. 7) and then, as shown in FIG. 8, theseflat sheets 3 b′, 4′ and 4″ are inserted into acavity 10 a of amold 10. In FIG. 7 theflat sheets 4′ and 4″ are placed on theflat sheet 3 b′ sequentially, but theflat sheets 4′ and 4″ may be adversely placed. In addition, in FIGS. 7 and 8 (also in FIGS. 9 to 12), each thickness of theflat sheets 4′ and 4″ is shown exaggeratingly for the purpose of clarification. - The outer measurement d1 of the
flat sheets 3 b′ and 4″ is larger than the inner measurement D of thecavity 10 a. However, since theflat sheets 3 b′ and 4″ formed of soft elastic material have smaller modulus of elasticity and are easy to be deformed, theseflat sheets 3 b′ and 4″ are easy to be inserted into thecavity 10 a. - On the other hand, the
flat sheet 4′ formed of thermoplastic or thermosetting resin has larger modulus of elasticity and is hard to be deformed. However, since the outer measurement d2 of theflat sheet 4′ is slightly smaller than the inner measurement D of thecavity 10 a, theflat sheet 4′ is also easy to be inserted into thecavity 10 a. - Next, as shown in FIGS. 8 and 9, the
mold 12 having acorrugated bottom surface 12 a is inserted into thecavity 10 a of themold 10, and then pressed and heated. When themold 12 has returned after this thermoforming, as shown in FIG. 10, thelower midsole 3 b having a corrugated upper surface is obtained and also, thecorrugated sheet 4 formed of theflat sheets 4′ and 4″ is obtained. - In addition, a flat sheet of about 10-20 mm thickness, made of soft elastic material, is cut along the circumference of the heel of an athletic shoe, as in the case of forming the
lower midsole 3 b. Then, by inserting this cut sheet into a mold set, one of which has a corrugated surface, pressing and heating it, theupper midsole 3 a having a flat top surface and a corrugated bottom surface is formed through thermoforming. The maximum thickness of theupper midsole 3 a after forming is set about 10-15 mm. - Then, by bonding the corrugated surface of the
upper midsole 3 a onto thecorrugated sheet 4 on thelower midsole 3 b and integrating them, the midsole construction of the present invention is completed (see FIGS. 11 and 12). - Before thermoforming the
lower midsole 3 b and thecorrugated sheet 4, as abovementioned, the circumferential end surface of theflat sheet 4′ is reced ed inwardly from the circumferential end surfaces of theflat sheets 3 b′ and 4″. Therefore, after thermoforming, the circumferential end surface of theflat sheet 4′ constituting the substantialcorrugated sheet 4 is buried inside the circumferential end surfaces of thelower midsole 3 b andflat sheet 4″, and hard to be distinguished from outside. - However, after forming, the circumferential end surface of the
flat sheet 4″ contacting tightly with theflat sheet 4′ is placed at the same position as the side surface of the heel, and besides, theflat sheet 4″ has a different color or design from that of thelower midsole 3 b. Thus, the consumers and users of shoes can distinguish the corrugated sheet by the existence of thesheet 4″ and as a result, aesthetic impression of shoes will be improved. - In FIGS.7-12, the
corrugated sheet 4 is comprised of theflat sheet 4′ formed of thermoplastic or thermosetting resin and theflat sheet 4″ formed of soft elastic material. However, thecorrugated sheet 4 may be comprised solely of theflat sheet 4′. - In this case, by enlarging the outer measurement of the
flat sheet 4′, the circumferential end surface of the formedflat sheet 4′ or thecorrugated sheet 4 should be preferably seen from outside. However, since theflat sheet 4′ has larger modulus of elasticity and is hard to deform, the outer circumference of the enlargedflat sheet 4′ cannot enter the cavity of a mold and as a result, burrs will occur around the outer circumference of the formedflat sheet 4′. Therefore, in this case, removal procedures of the burrs are required. - In the
above method 1 there is shown a method wherein after bonding the flat sheet constituting thecorrugated sheet 4 onto the upper surface of thelower midsole 3 b the flat sheet and the upper surface of thelower midsole 3 b are formed into corrugated configuration. But the present invention is not limited to this method. - After forming the flat sheet and the upper surface of the
lower midsole 3 b into corrugated configuration respectively and separately, thecorrugated sheet 4 may be interposed between the lower corrugated surface of theupper midsole 3 a and the upper corrugated surface of thelower midsole 3 b, and thesheet 4 may be bonded between themidsoles - In this case, a flat sheet of about 10-20 mm thickness, formed of soft elastic material, is cut along the circumferential configuration of the heel.
- Then, by inserting this cut flat sheet into a mold set, one of which has a corrugated surface, and pressing and heating it, the
upper midsole 3 a having a generally flat upper surface and a corrugated bottom surface is formed through thermoforming. The maximum thickness of the formedupper midsole 3 a is set about 5-7 mm. - Similarly, a flat sheet of about 10-20 mm thickness, formed of soft elastic material, is cut along the circumferential configuration of the heel. Then, by inserting this cut flat sheet into a mold set, one of which has a corrugated surface, and pressing and heating it, the
lower midsole 3 b having a generally flat bottom surface and a corrugated upper surface is formed through thermoforming. The maximum thickness of the formedlower midsole 3 b is set about 10-15 mm. - On the other hand, the
corrugated sheet 4 may be formed through either thermoforming or injection molding. In the case of thermoforming, by inserting such a laminate of theflat sheets 4′ and 4″ (or only theflat sheet 4′) as was explained in themethod 1 into a mold set, both of which have corrugated surfaces, and pressing and heating it, thecorrugated sheet 4 is obtained. In the case of injection molding, by introducing the molten thermoplastic resin into the injection mold having a corrugated surface, thecorrugated sheet 4 is obtained. - Then, by interposing the
corrugated sheet 4 between the corrugated surface on the bottom side of theupper midsole 3 a and the corrugated surface on the top side of thelower midsole 3 b, contacting thecorrugated sheet 4 with both of the corrugated surfaces of the upper andlower midsoles - The
method 3 is entirely different from theabovementioned methods - First, the
corrugated sheet 4 is formed by thermoforming or injection molding and the formedcorrugated sheet 4 is placed in a mold. Then, premixed polyurethane foam material is introduced into the mold and foamed in it. Thus, theupper midsole 3 a andlower midsole 3 b are formed integral with the upper and lower surfaces of thecorrugated sheet 4 and the midsole construction is completed. - In the midsole construction formed by the abovementioned processes, a shoe sole is constituted by bonding the
outsole 5 on the bottom surface of thelower midsole 3 b. Theoutsole 5 is mainly comprised of solid rubber and its landing surface has a plurality of slip preventive grooves or projections. - In addition, a shank member made of hard rigid resin or metal may be installed on the medial and lateral portions of the midfoot portion (or the arch portion) of the midsole construction in order to increase rigidity. Additionally, a member such as a stabilizer and the like may be provided between the
upper midsole 3 a and thevamp 2 so as to improve the stability of the heel portion. - Referring to FIGS.13-22, there are shown various kinds of midsole constructions of the present invention.
- In the embodiment shown in FIG. 13, the following relation exists between the amplitudes A1 and A2.
- 2 A1>2 A2 or A1>A2
- A1: the amplitude at the heel front end portion of the wave configuration of the
corrugated sheet 4; - A2: the amplitude at the heel back end portion of the wave configuration of the
corrugated sheet 4. - That is to say, in this case, since the amplitude of the wave configuration of the
corrugated sheet 4 is smaller at the back end side of the heel portion and greater at the front end side of the heel portion, adequate cushioning of themidsole 3 is sustained at the back end side heel portion of the smaller amplitude and compressive hardness of themidsole 3 is made higher at the front en d side heel portion of the greater amplitude. As a result, in the athletics where athletes land more frequently at the back end side of their heel portions, shock load in landing can be effectively eased at the heel back end side portion and cushioning properties can be ensured, and besides, the heel portions of the midsoles can be prevented from being deformed transversely after landing. - In addition, after landing, when the load moves toward the heel front end side portion of higher compressive hardness, the excessive sinking of the heel portion can be restrained, and thus, as the athletes move on to the next movements, loss in the athletic power can be decreased.
- In the embodiment shown in FIG. 14, the following relation exists between the amplitudes Ai and Ao.
- 2 Ai>2 Ao or Ai>Ao
- Ai: the amplitude at the heel medial portion of the wave configuration of the
corrugated sheet 4; - Ao: the amplitude at the heel lateral portion of the wave configuration of the
corrugated sheet 4. - That is to say, in this case, since the amplitude of the wave configuration of the
corrugated sheet 4 is greater at the medial side of the heel portion and smaller at the lateral side of the heel portion, adequate cushioning of themidsole 3 is sustained at the heel lateral portion of the smaller amplitude and compressive hardness of themidsole 3 is made higher at the heel medial portion of the greater amplitude. As a result, in the athletics where athletes land more frequently at the lateral side of their heel portions, shock load in landing can be effectively eased at the heel lateral portions and cushioning properties can be ensured. Moreover, when a foot is about to lean toward the heel medial portion after landing, the foot can be supported by the heel medial portion of the midsole and the heel portion of the midsole can be prevented from being deformed transversely after landing. - In addition, after landing, when the heel of a foot has pronated, the excessive sinking of the heel portion of a foot toward the midsole medial portion can be prevented by the heel medial portion of higher compressive hardness, and thus, over-pronation can be prevented.
- In the embodiment shown in FIG. 15, the following relation exists between the amplitudes Ai, Ao as in the embodiment shown in FIG. 14.
- Ai>Ao
- Moreover, the following relation also exists between the wavelengths λi and λo.
- λi/2>λo/2 or λi>λo
- λi: the wavelength at the heel medial portion of wave configuration of the
corrugated sheet 4; - λo: the wavelength at the heel lateral portion of wave configuration of the
corrugated sheet 4. - In this embodiment, as in the embodiment shown in FIG. 14, since the amplitude of wave configuration of the
corrugated sheet 4 is greater at the heel medial portion and smaller at the heel lateral portion, in the athletics where athletes land more frequently at the lateral side of their heel portions, cushioning can be ensured and the heel portion of the midsole can be prevented from being deformed transversely after landing. - Moreover, in this case, the wavelength of wave configuration of the
corrugated sheet 4 is greater at the heel medial portion and smaller at the heel lateral portion. In the athletics where athletes land more frequently at their heel lateral portions, when they land on the ground from the heel portions toward the toe portions of the shoes in sequence, the load path (or the load carrying path) can nearly coincide with the direction perpendicular to each ridge line of wave configuration. The direction of each ridge line or generating line is shown by x in FIG. 3 and the direction perpendicular to each ridge line or director line is shown by z in FIG. 3. In this case, themidsole 3 deforms along the ridge lines or ravine lines of wave configuration when landing. - As a result, the transverse deformation and the over-pronation at the heel portion can be securely prevented and the larger contact area can be secured when landing. Thus, grip properties and wear resistant properties can be improved.
- When this midsole construction is applied to a typical athletic shoe, each measurement is set as follows:
- e.g.) Ai=6 (mm), Ao=3.25 (mm), λi=40 (mm), λo=25 mm
- In the embodiment shown in FIG. 16, the following relation exists between the amplitudes Ai, Ao as in the embodiment shown in FIG. 14.
- Ai>Ao
- Moreover, the following relation also exists between the wavelengths λi and λo, different from the embodiment in FIG. 15.
- λo/2>λi/2 or λo>λi
- In this case, the wavelength of wave configuration of the
corrugated sheet 4 is greater at the heel lateral portion and smaller at the heel medial portion. In the athletics where athletes land more frequently at their heel medial portions, when they land on the ground from the heel portions toward the toe portions of the shoes in sequence, the load path can nearly coincide with the direction perpendicular to each ridge line of wave configuration. - As a result, the transverse deformation and the over-pronation at the heel portion can be securely prevented and the larger contact area can be secured when landing. Thus, grip properties and wear resistant properties can be improved.
- In the embodiment shown in FIG. 17, the following relation exists between the amplitudes Ai and Ao, different from the embodiment in FIG. 14.
- 2 Ao>2 Ai or Ao>Ai
- That is to say, in this case, since the amplitude of wave configuration of the
corrugated sheet 4 is greater at the lateral side of the heel portion and smaller at the medial of the heel portion, adequate cushioning of themidsole 3 is sustained at the heel medial portion of the smaller amplitude and compressive hardness of themidsole 3 is made higher at the heel lateral portion of the greater amplitude. - As a result, in the athletics where athletes land more frequently at the their heel medial portions, shock load in landing can be effectively eased at the heel medial portions and cushioning can be ensured. Moreover, when a foot is about to lean toward the heel lateral portion after landing the foot can be supported by the heel lateral portion of the midsole and the heel portion of the midsole can be prevented from being deformed transversely after landing.
- In addition, after landing, when the heel of a foot has supinated, excessive sinking of the heel portion of a foot can be restrained by the heel lateral portion of higher compressive hardness, and over-supination can be prevented.
- In the embodiment shown in FIG. 18, the following relation exists between the amplitudes Ai, Ao as in the embodiment shown in FIG. 17.
- Ao>Ai
- Moreover, the following relation also exists between the wavelengths λi and λo.
- λo/2>λi/2 or λo>λi
- In this case, since the amplitude of wave configuration of the
corrugated sheet 4 is greater at the lateral side of the heel portion and smaller at the medial side of the heel portion, as in the embodiment shown in FIG. 17, in the athletics where athletes land more frequently at the medial side of their heel portions, cushioning can be ensured and the heel portion of the midsole can be prevented from being deformed transversely after landing. - Furthermore, in this embodiment, the wavelength of wave configuration of the
corrugated sheet 4 is greater at the heel lateral portion and smaller at the heel medial portion. Therefore, in the athletics where athletes land more frequently at their heel medial portions, when they land on the ground from the heel portions toward the toe portions of the shoes in sequence, the load path can nearly coincide with the direction perpendicular to each ridge line of wave configuration. That is to say, themidsole 3 deforms along the ridge lines or ravine lines of wave configuration when landing. - As a result, the transverse deformation and the over-supination at the heel portion can be securely prevented and the larger contact area can be secured when landing. Thus, grip properties and wear resistant properties can be improved.
- In the embodiment shown in FIG. 19, the following relation exists between the amplitudes Ai, Ao as in the embodiment in FIG. 17.
- Ao>Ai
- Moreover, the following relation also exists between the wavelengths λi and λo, different from the embodiment in FIG. 18.
- λi/2>λo/2 or λi>λo
- That is to say, in this embodiment, the wavelength of wave configuration of the
corrugated sheet 4 is greater at the heel medial portion and smaller at the heel lateral portion. Therefore, in the athletics where athletes land more frequently at their heel lateral portions, when they land on the ground from the heel portions toward the toe portions of the shoes in sequence, the load path can nearly coincide with the direction perpendicular to each ridge line of wave configuration. As a result, the transverse deformation and the over-supination at the heel portion can be securely prevented and the larger contact area can be secured when landing. Thus, grip properties and wear resistant properties can be improved. - In another embodiment (not shown), the
corrugated sheet 4 of each of the abovementioned embodiments has a higher hardness than that of themidsole 3. Generally, as shock load is repeatedly imparted to themidsole 3 when landing, thecorrugated sheet 4 repeats deformation with themidsole 3. As a result, themidsole 3 gradually loses its elasticity and it becomes easy to be worn. On the contrary, when hardness of thecorrugated sheet 4 is set higher, themidsole 3 becomes hard to be worn due to the restorative properties of thecorrugated sheet 4. As a result, shock load in landing can be relieved during a prolonged use and cushioning can be secured. - In further embodiment (not shown), the
corrugated sheet 4 of each of the abovementioned embodiments is formed of the fiber reinforced plastic (FRP). Thus, thecorrugated sheet 4 will have improved elasticity and durability and be able to bear a prolonged use. The fiber reinforced plastic (FRP) is comprised of reinforcement fiber and matrix resin. Reinforcement fiber may be carbon fiber, aramid fiber, glass fiber and the like. Matrix resin may be thermoplastic or thermosetting resin. - In still further embodiment (not shown), each fiber of FRP in the above embodiment is oriented to the direction coinciding with the ridge direction of wave configuration of the
corrugated sheet 4. Thus, elasticity in the ridge direction can be selectively improved without excessively increasing elasticity in the direction perpendicular to the ridge line. - Preferably, FRP fiber is aligned in one direction. In addition, FRP fiber is plain weave woven by a filling and warp. Preferably, the modulus of elasticity of the filling is greater than or equal to that of the warp and the filling is oriented to the direction coinciding with the ridge direction of wave configuration of the
corrugated sheet 4. - Moreover, FRP fiber is aligned in one direction and the fiber is, preferably, oriented to the direction within ±30° with relation to the ridge direction of wave configuration of the
corrugated sheet 4. In addition, preferably, the fiber is woven by the filling and warp, and the modulus of elasticity of the filling is greater than or equal to that of the warp, and the filling is oriented to the direction within ±30° with relation to the ridge direction of the wave configuration of thecorrugated sheet 4. - Especially, when each ridge line direction is not respectively parallel as in the embodiments shown in FIGS. 15 and 16, the directions of aligned fibers and the filling should be oriented coinciding with the ridge line direction running through the general center line of the heel portion, and be oriented to the direction within ±30° with relation to the other ridge line directions.
- In the embodiment shown in FIG. 20, there are provided a plurality of
ribs 6 along the ridge lines on the surface of thecorrugated sheet 4. By adopting such a rib construction in thecorrugated sheet 4, elasticity in the ridge direction can be selectively improved without excessively increasing elasticity in the direction perpendicular to the ridge line direction. - In the embodiment shown in FIG. 21, there is provided an
aperture 20 penetrating theoutsole 5 andlower midsole 3 b in the center region of the heel portion of a shoe sole. - In addition, FIG. 22 shows the maximum pressures by contour lines, forced upon the plantar of a foot during running or jogging. As seen from FIG. 22, the maximum forces are imparted to the central region of the heel portion. Therefore, adequate cushioning is required in the central region of the heel portion.
- As shown in FIG. 21, when there is provided an
aperture 20 in the center region of the heel portion, it will relatively decrease compressive hardness of the midsole construction in the center region by the compressive hardness taken by thelower midsole 3 b. - As a result, adequate cushioning can be obtained in the center region. Moreover, in this embodiment, since the
corrugated sheet 4 of a moderate elasticity supports the pressure received by the heel portion and disperses it in thelower midsole 3 b and theoutsole 5, the heel portion will not sink excessively. - Especially, It is very effective to provide an aperture in the heel portion of a shoe where its sole has a heel portion of an independent structure or of a slip preventive construction such as studs and the like because in this kind of sole landing pressure is easy to concentrate on the heel portion, compared to the flat sole.
- In addition, some elderly people are attacked with pains caused by the fact that fats in the heel portions grow thin and the calcaneus spinae are pressed. The above aperture is also effective in easing these pains.
- Those skilled in the art to which the invention pertains may make modifications and other embodiments employing the principles of this invention without departing from its spirit or essential characteristics particularly upon considering the foregoing teachings. The described embodiments and examples are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. Consequently, while the invention has been described with reference to particular embodiments and examples, modifications of structure, sequence, materials and the like would be apparent to those skilled in the art, yet still fall within the scope of the invention.
Claims (30)
1. A midsole assembly for an athletic shoe comprising:
a midsole formed of soft elastic material;
a corrugated sheet disposed in at least a heel portion of said midsole; and
either or both amplitude and wavelength of wave configuration of said corrugated sheet being made different either or both between a front end portion and back end portion, and between a medial portion and lateral portion of said heel portion.
2. The midsole assembly for an athletic shoe of claim 1 wherein amplitude of wave configuration of said corrugated sheet is smaller in said back end portion and larger in said front end portion of said heel portion.
3. The midsole assembly for an athletic shoe of claim 1 wherein amplitude of wave configuration of said corrugated sheet is larger in said medial portion and smaller in said lateral portion of said heel portion.
4. The midsole assembly for an athletic shoe of claim 3 wherein wavelength of wave configuration of said corrugated sheet is larger in said medial portion and smaller in said lateral portion of said heel portion.
5. The midsole assembly for an athletic shoe of claim 3 wherein wavelength of wave configuration of said corrugated sheet is larger in said lateral portion and smaller in said medial portion of said heel portion.
6. The midsole assembly for an athletic shoe of claim 1 wherein amplitude of wave configuration of said corrugated sheet is larger in said lateral portion and smaller in said medial portion of said heel portion.
7. The midsole assembly for an athletic shoe of claim 6 wherein wavelength of wave configuration of said corrugated sheet is larger in said lateral portion and smaller in said medial portion of said heel portion.
8. The midsole assembly for an athletic shoe of claim 6 wherein wavelength of wave configuration of said corrugated sheet is larger in said medial portion and smaller in said lateral portion of said heel portion.
9. The midsole assembly for an athletic shoe of claim 1 wherein hardness of said corrugated sheet is higher than that of said midsole.
10. The midsole assembly for an athletic shoe of claim 1 wherein said corrugated sheet is comprised of fiber-reinforced plastic.
11. The midsole assembly for an athletic shoe of claim 10 wherein fibers of said fiber-reinforced plastic are aligned in one direction.
12. The midsole assembly for an athletic shoe of claim 11 wherein fibers of said fiber-reinforced plastic are oriented to the direction coinciding with the direction of ridges of said wave configuration.
13. The midsole assembly for an athletic shoe of claim 11 wherein said fibers are oriented within ±30° with relation to the direction of ridges of said wave configuration.
14. The midsole assembly for an athletic shoe of claim 10 wherein fibers of said fiber-reinforced plastic are woven by filling and warp, the modulus of elasticity of said filling being larger than or equal to that of said warp.
15. The midsole assembly for an athletic shoe of claim 14 wherein said filling being oriented to the direction coinciding with the direction of ridges of said wave configuration.
16. The midsole assembly for an athletic shoe of claim 14 wherein said filling being oriented within ±30° with relation to the direction of ridges of said wave configuration.
17. The midsole assembly for an athletic shoe of claim 1 wherein a plurality of ribs are provided on the surface of said corrugated sheet, said ribs being oriented to the direction coinciding with the direction of ridges of said wave configuration.
18. The midsole assembly for an athletic shoe of claim 1 wherein said corrugated sheet is comprised of a first corrugated sheet and a second corrugated sheet, said first corrugated sheet being formed of thermoplastic or thermosetting resin, the circumferential end surface thereof being located inside the side surface of said heel portion, said second corrugated sheet being formed of soft elastic material having smaller modulus of elasticity than that of said first corrugated sheet, the circumferential end surface thereof being located at substantially the same position as the side surface of said heel portion.
19. A midsole assembly for an athletic shoe comprising:
a midsole formed of soft elastic material, having an aperture in the heel central portion;
a corrugated sheet disposed in at least a heel portion of said midsole; and
either or both amplitude and wavelength of wave configuration of said corrugated sheet being made different either or both between a front end portion and back end portion, and between a medial portion and lateral portion of said heel portion.
20. The midsole assembly for an athletic shoe of claim 19 wherein hardness of said corrugated sheet is higher than that of said midsole.
21. The midsole assembly for an athletic shoe of claim 19 wherein said corrugated sheet is comprised of fiber-reinforced plastic.
22. The midsole assembly for an athletic shoe of claim 21 wherein fibers of said fiber-reinforced plastic are aligned in one direction.
23. The midsole assembly for an athletic shoe of claim 22 wherein fibers of said fiber-reinforced plastic are oriented to the direction coinciding with the direction of ridges of said wave configuration.
24. The midsole assembly for an athletic shoe of claim 22 wherein said fibers are oriented within ±30° with relation to the direction of ridges of said wave configuration.
25. The midsole assembly for an athletic shoe of claim 21 wherein fibers of said fiber-reinforced plastic are woven by filling and warp, the modulus of elasticity of said filling being larger than or equal to that of said warp.
26. The midsole assembly for an athletic shoe of claim 25 wherein said filling being oriented to the direction coinciding with the direction of ridges of said wave configuration.
27. The midsole assembly for an athletic shoe of claim 25 wherein said filling being oriented within ±30° with relation to the direction of ridges of said wave configuration.
28. The midsole assembly for an athletic shoe of claim 19 wherein a plurality of ribs are provided on the surface of said corrugated sheet, said ribs being oriented to the direction coinciding with the direction of ridges of said wave configuration.
29. The midsole assembly for an athletic shoe of claim 19 wherein said corrugated sheet is comprised of a first corrugated sheet and a second corrugated sheet, said first corrugated sheet being formed of thermoplastic or thermosetting resin, the circumferential end surface thereof being located inside the side surface of said heel portion, said second corrugated sheet being formed of soft elastic material having smaller modulus of elasticity than that of said first corrugated sheet, the circumferential end surface thereof being located at substantially the same position as the side surface of said heel portion.
30. A process for manufacturing a midsole assembly for an athletic shoe having a corrugated sheet disposed in at least a heel portion of a midsole, said process comprising the steps of:
overlaying a first flat sheet on a second flat sheet, wherein the first flat sheet is formed of thermoplastic or thermosetting resin and the circumferential end surface thereof is located inside the side surface of the heel portion of a shoe, and the second flat sheet is formed of soft elastic material having smaller modulus of elasticity than that of the first flat sheet and the circumferential end surface thereof is located at substantially the same position as the side surface of the heel portion of a shoe; and
forming the first and second flat sheets into corrugated sheets by placing the first and second flat sheets in a mold and thermoforming them.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/802,004 US6401365B2 (en) | 1997-04-18 | 2001-03-08 | Athletic shoe midsole design and construction |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11637697 | 1997-04-18 | ||
JP9-116376 | 1997-04-18 | ||
US08/910,794 US6219939B1 (en) | 1997-04-18 | 1997-08-13 | Athletic shoe midsole design and construction |
US09/802,004 US6401365B2 (en) | 1997-04-18 | 2001-03-08 | Athletic shoe midsole design and construction |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/910,794 Continuation US6219939B1 (en) | 1997-04-18 | 1997-08-13 | Athletic shoe midsole design and construction |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020014022A1 true US20020014022A1 (en) | 2002-02-07 |
US6401365B2 US6401365B2 (en) | 2002-06-11 |
Family
ID=14685466
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/910,794 Expired - Lifetime US6219939B1 (en) | 1997-04-18 | 1997-08-13 | Athletic shoe midsole design and construction |
US09/802,004 Expired - Lifetime US6401365B2 (en) | 1997-04-18 | 2001-03-08 | Athletic shoe midsole design and construction |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/910,794 Expired - Lifetime US6219939B1 (en) | 1997-04-18 | 1997-08-13 | Athletic shoe midsole design and construction |
Country Status (3)
Country | Link |
---|---|
US (2) | US6219939B1 (en) |
EP (1) | EP0878142B1 (en) |
DE (1) | DE69731185T2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060265902A1 (en) * | 2005-05-30 | 2006-11-30 | Kenjiro Kita | Sole structure for a shoe |
US20100160880A1 (en) * | 2004-05-21 | 2010-06-24 | Bluesky Medical Group Incorporated | Flexible reduced pressure treatment appliance |
US20160029741A1 (en) * | 2014-07-30 | 2016-02-04 | Nike, Inc. | Article Of Footwear With Banking Midsole With Embedded Resilient Plate |
US20190159547A1 (en) * | 2016-12-23 | 2019-05-30 | Tatsuya Nakatsuka | Shoe |
US11284670B2 (en) * | 2018-03-22 | 2022-03-29 | Mizuno Corporation | Midsole structure for a shoe |
WO2023122761A1 (en) * | 2021-12-23 | 2023-06-29 | Newton Running Company, Inc. | Shoe sole construction with wave cushion |
Families Citing this family (73)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6219939B1 (en) * | 1997-04-18 | 2001-04-24 | Mizuno Corporation | Athletic shoe midsole design and construction |
US6314664B1 (en) | 1997-04-18 | 2001-11-13 | Mizuno Corporation | Athletic shoe midsole design and construction |
US6327795B1 (en) * | 1997-07-30 | 2001-12-11 | Britek Footwear Development, Llc | Sole construction for energy storage and rebound |
US6108943A (en) * | 1998-01-30 | 2000-08-29 | Nike, Inc. | Article of footwear having medial and lateral sides with differing characteristics |
JP3215664B2 (en) | 1998-05-22 | 2001-10-09 | 美津濃株式会社 | Midsole structure for sports shoes |
JP3238129B2 (en) | 1998-06-08 | 2001-12-10 | 美津濃株式会社 | Midsole structure for sports shoes |
JP3207805B2 (en) * | 1998-06-25 | 2001-09-10 | 美津濃株式会社 | Midsole structure for sports shoes |
JP3238132B2 (en) | 1998-10-02 | 2001-12-10 | 美津濃株式会社 | Midsole structure for sports shoes |
JP2000296001A (en) * | 1999-04-16 | 2000-10-24 | Mizuno Corp | Sole structure of sport shoes |
JP2001008704A (en) * | 1999-07-02 | 2001-01-16 | Mizuno Corp | Midsole of sporting shoes |
IT1316448B1 (en) | 2000-01-19 | 2003-04-22 | Benetton Spa | DEVICE FOR THE ABSORPTION OF VIBRATIONS, PARTICULARLY THREADS OR SPORTS EQUIPMENT. |
JP4076704B2 (en) * | 2000-05-09 | 2008-04-16 | 美津濃株式会社 | Sole structure of sports shoes |
JP3979765B2 (en) * | 2000-05-15 | 2007-09-19 | 株式会社アシックス | Shoe sole shock absorber |
AU2001297713A1 (en) * | 2000-12-01 | 2002-10-15 | Britek Footwear Development, Llc | Sole construction for energy storage and rebound |
KR20030001325A (en) * | 2001-06-27 | 2003-01-06 | 다이니혼 잉키 가가쿠 고교 가부시키가이샤 | Paving material for footways and method of producing the same |
JP4906153B2 (en) | 2001-06-28 | 2012-03-28 | 美津濃株式会社 | Midsole structure for sports shoes |
US6754982B2 (en) | 2001-11-30 | 2004-06-29 | Wolverine World Wide, Inc. | Shoe cushioning system and related method of manufacture |
US7401419B2 (en) * | 2002-07-31 | 2008-07-22 | Adidas International Marketing B.V, | Structural element for a shoe sole |
DE102005006267B3 (en) * | 2005-02-11 | 2006-03-16 | Adidas International Marketing B.V. | Shoe sole e.g. for sport shoe, has heel which has bowl or edge having form corresponding to heel of foot and underneath bowl and or edge of heel side panels which are connected to separate rear side panel |
US7111415B2 (en) * | 2002-11-14 | 2006-09-26 | Stanley Hockerson | Athletic shoe frame |
ITTV20030017A1 (en) * | 2003-02-05 | 2004-08-06 | Tecnica Spa | FOOTWEAR HAVING A AT LEAST PARTIALLY COMPOSITE STRUCTURE. |
US7162815B2 (en) * | 2004-03-31 | 2007-01-16 | Mizuno Corporation | Midsole structure for an athletic shoe |
AU2005277218B2 (en) * | 2004-08-18 | 2008-12-04 | Fox Head, Inc. | Footwear with bridged decoupling |
US20070028484A1 (en) * | 2005-08-04 | 2007-02-08 | Skechers U.S.A., Inc. Ii | Shoe bottom heel portion |
US7401418B2 (en) * | 2005-08-17 | 2008-07-22 | Nike, Inc. | Article of footwear having midsole with support pillars and method of manufacturing same |
US20070113425A1 (en) * | 2005-11-23 | 2007-05-24 | Gary Wakley | Cushioning system for footwear |
US7707743B2 (en) | 2006-05-19 | 2010-05-04 | Nike, Inc. | Article of footwear with multi-layered support assembly |
US7757410B2 (en) * | 2006-06-05 | 2010-07-20 | Nike, Inc. | Impact-attenuation members with lateral and shear force stability and products containing such members |
US7877898B2 (en) * | 2006-07-21 | 2011-02-01 | Nike, Inc. | Impact-attenuation systems for articles of footwear and other foot-receiving devices |
US9578922B2 (en) * | 2006-11-06 | 2017-02-28 | Newton Running Company, Inc. | Sole construction for energy storage and rebound |
JP4399491B2 (en) * | 2007-11-13 | 2010-01-13 | 美津濃株式会社 | Sole structure for sports shoes |
US8099880B2 (en) * | 2009-01-05 | 2012-01-24 | Under Armour, Inc. | Athletic shoe with cushion structures |
US9433256B2 (en) | 2009-07-21 | 2016-09-06 | Reebok International Limited | Article of footwear and methods of making same |
US9392843B2 (en) * | 2009-07-21 | 2016-07-19 | Reebok International Limited | Article of footwear having an undulating sole |
US9015962B2 (en) * | 2010-03-26 | 2015-04-28 | Reebok International Limited | Article of footwear with support element |
USD649753S1 (en) * | 2009-08-18 | 2011-12-06 | Reebok International Ltd. | Portion of a shoe sole |
USD668028S1 (en) | 2009-10-23 | 2012-10-02 | Reebok International Limited | Shoe |
USD649754S1 (en) * | 2010-01-12 | 2011-12-06 | Reebok International Ltd. | Portion of a shoe sole |
USD652201S1 (en) | 2010-05-27 | 2012-01-17 | Reebok International Ltd. | Portion of a shoe |
US8584377B2 (en) | 2010-09-14 | 2013-11-19 | Nike, Inc. | Article of footwear with elongated shock absorbing heel system |
USD659958S1 (en) | 2010-09-24 | 2012-05-22 | Reebok International Limited | Portion of a shoe |
US8707587B2 (en) | 2010-12-29 | 2014-04-29 | Reebok International Limited | Sole and article of footwear |
US9055784B2 (en) | 2011-01-06 | 2015-06-16 | Nike, Inc. | Article of footwear having a sole structure incorporating a plate and chamber |
USD674996S1 (en) | 2011-05-16 | 2013-01-29 | Reebok International Limited | Portion of a shoe |
US8931187B2 (en) | 2011-08-25 | 2015-01-13 | Tbl Licensing Llc | Wave technology |
USD713134S1 (en) | 2012-01-25 | 2014-09-16 | Reebok International Limited | Shoe sole |
USD722426S1 (en) | 2012-03-23 | 2015-02-17 | Reebok International Limited | Shoe |
US9913510B2 (en) | 2012-03-23 | 2018-03-13 | Reebok International Limited | Articles of footwear |
DE102012206094B4 (en) | 2012-04-13 | 2019-12-05 | Adidas Ag | Soles for sports footwear, shoes and method of making a shoe sole |
US9498927B2 (en) * | 2013-03-15 | 2016-11-22 | Nike, Inc. | Decorative foam and method |
USD732810S1 (en) | 2013-08-08 | 2015-06-30 | Tbl Licensing Llc | Footwear outsole |
USD746031S1 (en) * | 2014-05-05 | 2015-12-29 | Zumba Fitness Llc | Shoe sole |
USD754958S1 (en) * | 2014-05-08 | 2016-05-03 | Taylor Made Golf Company, Inc. | Golf shoe |
JP2018501916A (en) * | 2015-01-19 | 2018-01-25 | ザ・ロックポート・カンパニー・エルエルシー | Footwear bottom |
CN115413848A (en) | 2015-05-26 | 2022-12-02 | 耐克创新有限合伙公司 | Foot-supporting member providing dynamic conversion characteristics |
DE102015224702B4 (en) * | 2015-12-09 | 2017-09-14 | Adidas Ag | Sole elements and shoes |
USD788415S1 (en) * | 2015-12-28 | 2017-06-06 | Nike, Inc. | Shoe midsole |
JP6294909B2 (en) | 2016-05-11 | 2018-03-14 | 美津濃株式会社 | Sole structure for shoes and shoes using the same |
EP3487345B1 (en) * | 2016-07-20 | 2019-11-13 | Nike Innovate C.V. | Footwear plate |
KR102207238B1 (en) | 2017-02-01 | 2021-01-22 | 나이키 이노베이트 씨.브이. | Stacked cushioning arrangement for sole structure |
TWI760502B (en) | 2017-06-01 | 2022-04-11 | 荷蘭商耐克創新有限合夥公司 | Methods of manufacturing articles utilizing foam particles |
USD905411S1 (en) | 2018-08-01 | 2020-12-22 | Tbl Licensing Llc | Footwear outsole |
USD912954S1 (en) | 2018-08-01 | 2021-03-16 | Tbl Licensing Llc | Footwear |
USD905408S1 (en) | 2018-08-01 | 2020-12-22 | Tbl Licensing Llc | Footwear outsole |
USD905406S1 (en) | 2018-08-01 | 2020-12-22 | Tbl Licensing Llc | Footwear outsole |
EP3984401B1 (en) | 2018-12-06 | 2023-06-07 | Nike Innovate C.V. | Methods of manufacturing articles utilizing foam particles |
USD895949S1 (en) | 2018-12-07 | 2020-09-15 | Reebok International Limited | Shoe |
USD895951S1 (en) | 2019-03-07 | 2020-09-15 | Reebok International Limited | Sole |
USD903254S1 (en) | 2019-05-13 | 2020-12-01 | Reebok International Limited | Sole |
JP2021053250A (en) * | 2019-09-30 | 2021-04-08 | 美津濃株式会社 | Sole structure of shoe |
CN114945458A (en) | 2019-11-19 | 2022-08-26 | 耐克创新有限合伙公司 | Method for producing an article with foam particles |
WO2022043945A1 (en) * | 2020-08-31 | 2022-03-03 | Puma SE | Articles of footwear with engineered wood |
USD970164S1 (en) * | 2020-11-19 | 2022-11-22 | Nike, Inc. | Shoe |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1841461A (en) * | 1927-04-13 | 1932-01-19 | North American Chemical Compan | Shoe bottom filler sheet or piece |
US2400487A (en) * | 1942-02-28 | 1946-05-21 | Goodall Sanford Inc | Composite sheet material |
US2364134A (en) * | 1943-10-02 | 1944-12-05 | Bigelow Sanford Carpet Co Inc | Shoe sole |
US2677906A (en) * | 1952-08-14 | 1954-05-11 | Reed Arnold | Cushioned inner sole for shoes and meth od of making the same |
US4268980A (en) * | 1978-11-06 | 1981-05-26 | Scholl, Inc. | Detorquing heel control device for footwear |
DE3037108A1 (en) * | 1980-10-01 | 1982-05-13 | Herbert Dr.-Ing. 8032 Lochham Funck | UPHOLSTERED SOLE WITH ORTHOPEDIC CHARACTERISTICS |
JPS59103605U (en) * | 1982-12-28 | 1984-07-12 | 美津濃株式会社 | athletic shoe soles |
JPS60150701A (en) * | 1984-01-17 | 1985-08-08 | 株式会社アシックス | Middle sole for sports shoes |
US4805319A (en) * | 1985-02-26 | 1989-02-21 | Kangaroos U.S.A., Inc. | Cushioning and impact absorptive means for footwear operative component |
US4864737A (en) * | 1988-07-14 | 1989-09-12 | Hugo Marrello | Shock absorbing device |
EP0483145B1 (en) * | 1988-12-14 | 1996-08-14 | Avia Group International, Inc. | Insert member for use in an athletic shoe |
JPH0687809B2 (en) * | 1990-10-16 | 1994-11-09 | アキレス株式会社 | Injection molding shoe mold and method of processing the same |
US6219939B1 (en) * | 1997-04-18 | 2001-04-24 | Mizuno Corporation | Athletic shoe midsole design and construction |
-
1997
- 1997-08-13 US US08/910,794 patent/US6219939B1/en not_active Expired - Lifetime
- 1997-08-14 DE DE69731185T patent/DE69731185T2/en not_active Expired - Lifetime
- 1997-08-14 EP EP97306179A patent/EP0878142B1/en not_active Expired - Lifetime
-
2001
- 2001-03-08 US US09/802,004 patent/US6401365B2/en not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100160880A1 (en) * | 2004-05-21 | 2010-06-24 | Bluesky Medical Group Incorporated | Flexible reduced pressure treatment appliance |
US20110087178A2 (en) * | 2004-05-21 | 2011-04-14 | Bluesky Medical Group Incorporated | Improved flexible reduced pressure treatment appliance |
US20060265902A1 (en) * | 2005-05-30 | 2006-11-30 | Kenjiro Kita | Sole structure for a shoe |
US7624515B2 (en) * | 2005-05-30 | 2009-12-01 | Mizuno Corporation | Sole structure for a shoe |
US20160029741A1 (en) * | 2014-07-30 | 2016-02-04 | Nike, Inc. | Article Of Footwear With Banking Midsole With Embedded Resilient Plate |
US10010137B2 (en) * | 2014-07-30 | 2018-07-03 | Nike, Inc. | Article of footwear with banking midsole with embedded resilient plate |
US20190159547A1 (en) * | 2016-12-23 | 2019-05-30 | Tatsuya Nakatsuka | Shoe |
US11284670B2 (en) * | 2018-03-22 | 2022-03-29 | Mizuno Corporation | Midsole structure for a shoe |
WO2023122761A1 (en) * | 2021-12-23 | 2023-06-29 | Newton Running Company, Inc. | Shoe sole construction with wave cushion |
Also Published As
Publication number | Publication date |
---|---|
EP0878142B1 (en) | 2004-10-13 |
DE69731185D1 (en) | 2004-11-18 |
EP0878142A1 (en) | 1998-11-18 |
US6219939B1 (en) | 2001-04-24 |
DE69731185T2 (en) | 2006-02-16 |
US6401365B2 (en) | 2002-06-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6401365B2 (en) | Athletic shoe midsole design and construction | |
US6389713B1 (en) | Athletic shoe midsole design and construction | |
EP1264556B1 (en) | Sole assembly for sports shoe | |
EP0958752B1 (en) | Athletic shoe midsole design and construction | |
US6647645B2 (en) | Midsole structure of athletic shoe | |
US9961959B2 (en) | Sole structure with traction elements | |
EP0963711B1 (en) | Athletic shoe midsole design and construction | |
US9781972B2 (en) | Article of footwear incorporating an impact absorber and having an upper decoupled from its sole in a midfoot region | |
US6295741B1 (en) | Athletic shoe sole design and construction | |
US6314664B1 (en) | Athletic shoe midsole design and construction | |
EP1064861B1 (en) | Athletic shoe midsole design and construction | |
US6393732B1 (en) | Athletic shoe midsole design and construction | |
EP2833751B1 (en) | Sole structure for article of footwear | |
EP0966895B1 (en) | Athletic shoe midsole design and construction | |
JP3308482B2 (en) | Midsole structure for sports shoes and molding method thereof | |
US20060265902A1 (en) | Sole structure for a shoe | |
EP1894484A1 (en) | Sole structure body for shoes | |
CN115251529B (en) | Sole element | |
US20210298416A1 (en) | Shoes |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |