EP3733013A1 - Schuhsohle - Google Patents

Schuhsohle Download PDF

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Publication number
EP3733013A1
EP3733013A1 EP20020192.9A EP20020192A EP3733013A1 EP 3733013 A1 EP3733013 A1 EP 3733013A1 EP 20020192 A EP20020192 A EP 20020192A EP 3733013 A1 EP3733013 A1 EP 3733013A1
Authority
EP
European Patent Office
Prior art keywords
layer
sole assembly
external sole
sole
shoe
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.)
Withdrawn
Application number
EP20020192.9A
Other languages
English (en)
French (fr)
Inventor
Marlène GIANDOLINI
François Girard
Jean-Philippe Romain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salomon SAS
Original Assignee
Salomon SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Salomon SAS filed Critical Salomon SAS
Publication of EP3733013A1 publication Critical patent/EP3733013A1/de
Withdrawn legal-status Critical Current

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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
    • A43B13/122—Soles with several layers of different materials characterised by the outsole or external layer
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/026—Composites, e.g. carbon fibre or aramid fibre; the sole, one or more sole layers or sole part being made of a composite
    • 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
    • A43B13/187—Resiliency achieved by the features of the material, e.g. foam, non liquid materials
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B5/00—Footwear for sporting purposes

Definitions

  • the present invention relates to a sole for a walking or sports shoe.
  • the perception of cushioning is associated mainly with two characteristics of the sole, namely, its capacity to absorb and restore energy, hereinafter called “resilience”, and its capacity to absorb vibratory shocks.
  • Resilience is the ratio between the energy returned and the energy applied to the material. It characterizes the “rebound” of the shoe, its ability to restore energy to facilitate propulsion.
  • the characteristic attenuating the vibratory power tends to reduce the preceding elastic / dynamic characteristic.
  • This filtering characteristic is nevertheless essential for reducing muscle and bone trauma resulting from the repeated vibrations generated at each impact of the shoe with the ground.
  • these two components are negatively correlated: high resilience is, most of the time, associated with low damping of vibrations. Also, to obtain good cushioning from the shoe, you have to find a good compromise between these two characteristics.
  • the sole incorporates an insert made of a viscous gel-like material.
  • the sole comprises a superposition of layers of material in the direction of the thickness, these layers having different hardnesses.
  • the sole is made up of portions having different densities.
  • the document FR3062992 provides an alternative sole construction consisting of a first material in the heel area and a second material in the toe area.
  • the first material has a characteristic of absorbed elastic energy which is greater than that of the second material.
  • the materials used are of the foam rubber type.
  • the aim of the invention is to provide an improved shoe sole.
  • One aim is in particular to provide a shock-absorbing sole construction alternative to existing constructions.
  • One aim is in particular to provide a sole making it possible to reduce the power of the vibrations entering the body without being to the detriment of resilience and comfort.
  • Another object is to provide a lightweight shock absorbing sole.
  • Another aim is to reduce fatigue and / or muscle or bone damage.
  • the outer sole assembly is characterized by the fact that the second material is a viscoelastic material with a viscous nature, characterized by a hysteresis defined according to standard D3574 of between 20% and 60% and at least 8% greater than the hysteresis. characterizing the first material.
  • the use of cellular foams makes it possible to obtain a relatively light structure.
  • the viscosity of the second viscoelastic material, placed at the level of the heel makes it possible to attenuate the power of the vibrations transmitted to the body. By being coupled with a lower layer having a lower hysteresis, this allows to maintain good resilience at the heel. It has been observed, during tests, that the damping performance is improved the more the more viscous material is placed closer to the foot.
  • such an external shoe sole assembly can incorporate one or more of the following characteristics, taken in any technically admissible combination:
  • the first material is characterized by a hysteresis defined according to the D3574 standard of less than 15%.
  • the material of the second layer is characterized by a hysteresis defined according to the D3574 standard of less than 35%.
  • the second layer covers part of the top surface of the first layer.
  • the thickness of the second layer is less than the thickness of the first layer.
  • the outer sole assembly does not include a second layer in the anterior third of the outer sole, vis-à-vis the metatarsals.
  • the second layer is attached directly to the first layer.
  • the second layer is overmolded on the first layer.
  • the second material is a blend of Ethylene-Vinyl Acetate (EVA) and thermoplastic rubber.
  • the composition of the second material is produced in the following proportions: 25 to 75% of Ethylene-Vinyl Acetate (EVA) for 25 to 75% of plastic rubber.
  • EVA Ethylene-Vinyl Acetate
  • composition of the second material is produced in the following proportions: 50 to 70% of Ethylene-Vinyl Acetate (EVA) for 30 to 50% of polyolefin copolymer.
  • EVA Ethylene-Vinyl Acetate
  • the first material has a hardness between 40 and 60 Asker C and in that the second material has a hardness between 30 and 50 Asker C.
  • the first and second materials have a density of less than 0.3.
  • the upper contacts the upper face of the second layer on at least one edge.
  • the invention also relates to a sports shoe equipped with an external sole assembly as described above.
  • lateral and medial in a conventional manner, are understood as facing outwards and inwards respectively.
  • medial side of one foot or shoe faces the medial side of the other foot or other shoe of the user.
  • longitudinal refers to a heel-toe direction corresponding to the X axis while the term “transverse” refers to a lateral-medial direction corresponding to the Y axis and therefore substantially perpendicular to the longitudinal direction.
  • the vertical or down / up direction corresponds to the Z axis.
  • a “shoe” is defined by a “sole” and an “upper”.
  • the “sole” is the lower part of the shoe between the foot and the ground. This is the underside of the shoe.
  • the “upper” is the upper part of the shoe enveloping the foot and possibly part of the ankle. This is the top of the shoe.
  • the upper is secured to the peripheral edge of the sole assembly. It should be noted that certain elements of the shoe can form both part of the sole assembly and part of the upper.
  • the figures 1 to 6 illustrate the construction of an outer sole according to a first embodiment of the invention in a sports shoe 1.
  • the sports shoe 1 for the left foot shown is a running shoe, but could be a completely different type of shoe. sports shoe.
  • This shoe 1 is shown in perspective, seen from below in the figure 1 . It comprises a rod 2, which surmounts a sole assembly 3.
  • the rod 2 will not be described in detail hereinafter. It can be any rod construction.
  • the sole assembly 3 comprises a superposition of layers between the ground and the underside of the foot, as illustrated on figure 2 .
  • the first layer is a sockliner 31. It is generally mounted removable inside the shoe.
  • the next layer located below the insole 31 is a fitting insole 32.
  • This second layer 32 is generally attached to the lower peripheral edges of the upper 2.
  • an outer sole 33 under the insole 32.
  • This outer sole assembly 33 is generally fixed to the insole 32 in any manner known per se, such as, for example, by gluing. This outer sole assembly 33 is intended to come into contact with the ground.
  • the invention relates to a specific construction of the outer sole 33.
  • the outer sole 33 extends lengthwise from a rear end 33R to a forward end 33F, thereby defining a sole length L33, in width between a lateral side 33L and a medial side 33M, and in height from a lower surface. 33D to a top surface 33U.
  • the outer sole assembly 33 comprises a first layer 331 made of a first material composed of cellular foam.
  • the first layer 331 extends over substantially the entire length of the outer sole L33, that is to say, at least 90% of the total length of the outer sole.
  • the first layer 331 is delimited by an upper face 331U and by a lower face 331D.
  • the outer sole 33 also comprises a second layer 332 made of a second material composed of cellular foam, different from the first material. At least part of the second layer 332 is located in a zone ZR1 located in the rear third of the outer sole assembly.
  • the second layer 332 is superimposed on the first layer 331.
  • the second layer 332 is fixed to the first layer 331 by any suitable means. This can be by gluing, overmolding, welding ...
  • the second layer 332 By being attached directly to the first layer 331, the second layer 332 forms a continuity with the first layer. The absence of an intermediate element between these two layers makes it possible to obtain the desired resilience and damping properties.
  • the outer sole assembly 33 also comprises a wear layer 333 fixed to the first layer 331 so as to cover a large part of the lower surface 331D of the first layer.
  • This wear layer 333 is thus interposed between the first layer 331 and the ground. As seen in the figures 6 and 10 , it can go up on the front part 33F of the sole assembly so as to delimit the front end 33F of the sole assembly.
  • This wear layer 333 is intended to be systematically in contact with the ground. It thus ensures the grip or "grip" of the shoe.
  • the wear layer 333 is fixed to the first layer 331 by any suitable means. This can be by gluing, overmolding, welding ...
  • the second layer 332 must be positioned under the user's heel, ie in the zone ZR1 situated in the rear third of the outer sole 33. It can nevertheless extend over a zone larger and for example cover a zone ZR2 corresponding to the posterior two thirds of the outer sole assembly.
  • the anterior third of the outer sole assembly facing the metatarsals, it is desirable not to have any overlap between the first and second layers. Indeed, in this zone, it is preferable to seek dynamism to facilitate the recovery or the propulsion of the runner.
  • the choice of a material with good resilience promotes energy restitution. Consequently, the absence of a second layer in this zone will be preferred. Indeed, since the material of the first layer is more resilient than the material of the second layer, this allows us to have this dynamic effect.
  • the outer sole 33 may comprise more layers, interposed between two of the previous layers.
  • the invention relates to the choice of the constituent material of the second layer 332.
  • the present invention aims to optimize the construction of a sole in order to improve the damping of vibrations while maintaining the resilience of the outer sole assembly and the perceived comfort of the shoe. Filtering the vibrations of bone and muscle tissue is essential because they are the cause of microtrauma and fatigue.
  • Resilience is measured by a classic test illustrated in figure 12 .
  • This test consists in dropping a mass (ie 5 kg), from a given height (ie 23.5 cm), on the sample to be characterized (here, the external sole assembly). We then measure the rebound height of the mass. It is this height that characterizes resilience. Alternatively, one could qualify the resilience with a more standard test, according to the ISO-4662 standard.
  • the characterization of the vibration shock absorption capacity of a sole assembly results from biomechanical tests on runners.
  • Each runner was equipped with three Triaxial accelerometers: one placed on the anteromedial aspect of the left tibia, one placed on the muscular belly of the left vastus medialis and one placed on the muscular belly of the left gastrocnemius medialis .
  • the vertical axis of each accelerometer was substantially aligned with the longitudinal axis of the bone or muscle.
  • the runner then tests different sole constructions while running on a track. For each impact with the ground, we measure the stresses on the tibia, figure 13a , and muscles, figure 13b (for the vastus medialis muscle) via accelerometers.
  • the S2 sole has a resilience close to, slightly lower than that of the reference (100% Ethylene-Vinyl Acetate (EVA) sole) unlike the S1 sole which exhibits better resilience.
  • EVA Ethylene-Vinyl Acetate
  • composition of the second material can be produced in the following proportions: 50 to 70% of Ethylene-Vinyl Acetate (EVA) for 30 to 50% of polyolefin copolymer.
  • EVA Ethylene-Vinyl Acetate
  • the composition of the second material can be produced in the following proportions: 25 to 75% of Ethylene-Vinyl Acetate (EVA) for 25 to 75% of plastic rubber.
  • EVA Ethylene-Vinyl Acetate
  • the density of the first material is preferably between 0.15 and 0.25, which makes it possible not to make the sole assembly too heavy.
  • the density of the second material is preferably between 0.15 and 0.25, which also makes it possible not to make the sole assembly too heavy.
  • the first and second materials have a density of less than 0.35 and preferably less than 0.3.
  • the hardness of the first material is preferably between 40 and 60 Asker C, which allows good deformation of the material with a certain hold, thus promoting the dynamic behavior of the shoe (revival, dynamism).
  • the hardness of the second material is preferably between 30 and 50 Asker C, which allows good deformation of the material with a certain hold, thus promoting the dynamic behavior of the shoe (revival, dynamism).
  • the second layer when it is characterized by a hysteresis defined according to standard D3574 which is at least 8% greater than the hysteresis characterizing the first material.
  • a PolyUrethane (PU) foam such as PORON TM.
  • the first material is characterized by a hysteresis defined according to the D3574 standard of less than 15%. This limit makes it possible to characterize a viscoelastic material with an elastic nature. The material exhibits a dynamic behavior allowing good resilience. In addition, such a material is relatively light, which improves the comfort of the shoe.
  • the second material is a viscoelastic material characterized by a hysteresis defined according to standard D3574 of between 20% and 60%.
  • a material exhibiting a hysteresis defined according to standard D3574 greater than 20% is a viscoelastic material with a viscous nature.
  • Such a material provides most of the vibration damping of the sole assembly.
  • the second material is a viscoelastic material characterized by a hysteresis defined according to the D3574 standard of between 20% and 35%. In fact, above 35%, the material tends to become heavier which reduces the comfort of the shoe, as is the case with PORON TM.
  • the thickness e332 of the second layer 332 is less than the thickness e331 of the first layer 331.
  • ethylene-vinyl acetate (EVA) sole unit was used but different types of socks 31 were used.
  • the socks were made with a viscoelastic material at viscous character. We then find benefits similar to those of the S2 sole assembly in terms of damping behavior.
  • the characterization illustrated on the graph of figure 16 incorporating relative values with respect to a 100% Ethylene-Vinyl Acetate (EVA) reference, is substantially identical to that of the S2 sole assembly.
  • the first sockliner was made with a viscoelastic material with elastic nature, for example Thermoplastic Polyurethane (TPU).
  • TPU Thermoplastic Polyurethane
  • the figures 3 to 6 show a first embodiment of a sole assembly for a right foot.
  • the second layer 332 covers the upper face 331U of the first layer 331 over substantially the rear half of the sole assembly, from a part located under the arch of the foot to the rear end 33R of the sole assembly.
  • the second layer extends over the entire width of the sole assembly at the interface with the upper.
  • the width of the second layer gradually decreases as one moves away from the heel area.
  • part of the first layer rises laterally to the upper.
  • the rod will be in contact with the upper face 332U of the second layer 332 and, on one or both edges, with the upper face 331U of the first layer 331.
  • the figure 4 corresponding to section IV-IV, represents a configuration for which the rod will mainly be in contact with the upper surface 332U of the second layer 332U except at the level of the medial edge, where it will be in contact with the upper surface 331U of the first layer 331.
  • the rod At the anterior end of the second layer 332, the rod will contact the upper surface 331U of the first layer 331, at the lateral and medial edges and, will contact the upper surface 332U of the first layer 331. the second layer 332 in the central part of the width.
  • the first layer 331 may comprise a through opening 331A to the upper surface 331U.
  • the first layer 331 does not cover the lower face 332D of the second layer 332 or, in other words, the second layer 332 covers the through opening 331A.
  • the second layer is always kept away from the ground and the wear layer 333. There is always a part of the first layer that will be in. below the lowest part of the bottom surface of the second layer. In this example, the second layer can be glued to the first layer.
  • the second layer 332 is not encapsulated in the first layer 331.
  • part of the second layer is not bordered laterally by the first layer.
  • the second layer opens locally on a lateral edge of the outer sole 33. It thus forms a lateral portion of the outer sole 33. Consequently, when the outer sole assembly is compressed in the thickness direction, the second layer 332 can more easily deform laterally (locally) because it is not retained by a border formed by the first layer because the second layer is not encapsulated.
  • the vibration shock absorption properties of the second layer are found to be better with this construction.
  • the figures 7 to 10 show a second embodiment of a sole assembly for a right foot.
  • the second layer 332 fills a recess 3310 opening onto the upper face 331U of the first layer.
  • the second layer 332 is completely surrounded by the first layer 331.
  • the second layer can be overmolded to the first layer.
  • the figure 11 illustrates a third embodiment of a sole assembly for a right foot.
  • the first layer separates into two subdivisions, a high subdivision 3311 and a low subdivision 3312.
  • the second layer 332 is then interposed between these two high 3311 and low 3312 subdivisions. Even if this configuration has With a lower benefit, it can constitute an interesting alternative solution, exhibiting better damping behavior than a 100% Ethylene-Vinyl Acetate (EVA) sole.
  • EVA Ethylene-Vinyl Acetate
  • the second layer 332 is fixed on the upper surface 331U or the lower surface 331D of the first layer 331 and a third layer covers the second layer 332, at the level of the surface opposite to the surface of the second layer in contact with the first layer.
  • the third layer can be made of the same material as that of the first layer. However, it can be made with another material.
  • the third layer is attached to the second layer by any suitable means. This can be by gluing, overmolding, welding ...

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP20020192.9A 2019-04-30 2020-04-23 Schuhsohle Withdrawn EP3733013A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1904573A FR3095576A1 (fr) 2019-04-30 2019-04-30 Semelle de chaussure

Publications (1)

Publication Number Publication Date
EP3733013A1 true EP3733013A1 (de) 2020-11-04

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ID=68138265

Family Applications (1)

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EP20020192.9A Withdrawn EP3733013A1 (de) 2019-04-30 2020-04-23 Schuhsohle

Country Status (3)

Country Link
EP (1) EP3733013A1 (de)
CN (1) CN111838882A (de)
FR (1) FR3095576A1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4768295A (en) 1986-04-11 1988-09-06 Asics Corporation Sole
US4798010A (en) 1984-01-17 1989-01-17 Asics Corporation Midsole for sports shoes
US20090133288A1 (en) * 2003-04-07 2009-05-28 Gallegos Alvaro Z Footwear with two-plate system
US20110283560A1 (en) 2010-05-18 2011-11-24 Montrail Corporation Multiple response property footwear
US20160278481A1 (en) * 2015-03-23 2016-09-29 Adidas Ag Sole and shoe
WO2017058420A1 (en) * 2015-10-02 2017-04-06 Nike Innovate C.V. Plate for footwear
FR3062992A1 (fr) 2017-02-23 2018-08-24 Guy Sparacca Semelle dynamique de chaussure
US20190021443A1 (en) * 2015-12-28 2019-01-24 Asics Corporation Shock absorbing material, shoe sole member, shoe, and protective equipment for sports

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798010A (en) 1984-01-17 1989-01-17 Asics Corporation Midsole for sports shoes
US4768295A (en) 1986-04-11 1988-09-06 Asics Corporation Sole
US20090133288A1 (en) * 2003-04-07 2009-05-28 Gallegos Alvaro Z Footwear with two-plate system
US20110283560A1 (en) 2010-05-18 2011-11-24 Montrail Corporation Multiple response property footwear
US20160278481A1 (en) * 2015-03-23 2016-09-29 Adidas Ag Sole and shoe
WO2017058420A1 (en) * 2015-10-02 2017-04-06 Nike Innovate C.V. Plate for footwear
US20190021443A1 (en) * 2015-12-28 2019-01-24 Asics Corporation Shock absorbing material, shoe sole member, shoe, and protective equipment for sports
FR3062992A1 (fr) 2017-02-23 2018-08-24 Guy Sparacca Semelle dynamique de chaussure

Also Published As

Publication number Publication date
CN111838882A (zh) 2020-10-30
FR3095576A1 (fr) 2020-11-06

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