Shoe sole

Abstract

The shoe comprises: an upper comprising a casing and a sole comprising two half-portions secured to each other to form a cushioning layer, at least one of said half-portion comprising a wall extending upwards to cover at least part of the casing of the upper. The at least one wall covers a first upper overlap height at the level of the metatarsal head area and, locally, a maximum upper overlap height, the maximum overlap height being greater than at least four times the first overlap height. Figure for abstract: Fig. 3

Description

Title of the invention: Shoe sole

[0001] The present invention relates to a sports shoe sole.

[0002] The invention aims at a sole structure making it possible to obtain good lateral support without needing to add a specific chassis.

[0003] Conventionally, the sole of a shoe comprises a single-piece cushioning layer ensuring cushioning of the sole. To ensure good lateral stability of the foot, it is known to add a chassis integral with the cushioning layer and rising along the upper on the medial and / or lateral side. Document US6497058 describes, for example, such a construction.

[0004] From an industrial point of view, the cushioning layer is generally produced by injecting an expandable material into a mold, the expansion of the material to obtain the desired dimension being carried out either in the mold or outside the mold. Alternatively, the cushioning layer can be produced by compressing a preform in a mold to the desired dimension. For these two technologies, the mold used most of the time comprises two movable dies, one relative to the other, along a vertical plane. Thus, these tools do not allow for lateral and medial edges that rise vertically, upwards, overlapping the quarters of the upper, over a great height without having a risk of undercutting and filling the mold. This cushioning layer with a low lateral overlap height therefore does not ensure good lateral support of the foot.

[0005] Documents EP4048107 and EP3790732 describe a cushioning layer construction in two half-portions, one lateral and one medial. In these two documents, the peripheral edge of the assembly of these two half-portions has a low height from the upper face intended to face the foot. The objective of this construction is to be able to produce a cushioning layer comprising transverse openings, with simple molds, two impressions. For these embodiments, the impressions of the mold are movable along a plane transverse to the sole assembly and not along a vertical plane as mentioned previously.

[0006] The aim of the invention is to propose an improved shoe sole.

[0007] One goal is to provide a shoe that improves the lateral stability of the foot without the addition of a specific chassis.

[0008] Another aim is to propose a damping layer made from a simple, space-saving mold, preferably with two impressions.

[0009] Another aim is to propose a construction providing longitudinal stiffness to the sole in order to improve the rolling of the foot.

[0010] The invention provides a shoe comprising an upper comprising a casing and a sole comprising a lateral half-portion and a medial half-portion, the lateral and medial half-portions being secured to each other to form a cushioning layer, the lateral half-portion comprising a lateral wall extending upwards to cover at least a lateral part of the casing of the upper and / or the medial half-portion comprising a medial wall extending upwards to cover at least a medial part of the casing of the upper.

[0011] The shoe is characterized in that the lateral and / or medial wall covers a first upper overlap height at the level of the metatarsal head area and, locally, a maximum upper overlap height at the level of a support zone, posterior to the metatarsal head area, the maximum overlap height in this support zone being greater than at least four times the first overlap height.

[0012] The construction of the cushioning layer in two half-portions allows the use of simple molds, these being able to have only two impressions. These molds can be compact and therefore have a reduced footprint which makes them economical. This construction especially makes it possible to easily produce a cushioning layer with high lateral and medial walls in order to cover certain areas of the quarters of the upper. Thus, part of the cushioning layer can locally cover part of the envelope of the upper in order to provide better lateral support for the upper. Furthermore, the reduction in the covering height of the cushioning layer at the level of the metatarsal heads area makes it possible not to penalize the rolling of the foot by not hindering the flexion of the upper at the front of the foot. This construction therefore represents a compromise between good lateral support of the foot and good rolling of the latter.In addition, the assembly of the two half-portions will generate a longitudinal stiffening of the cushioning layer which also improves the rolling of the foot by promoting the heel / toe rocking.

[0013] According to advantageous but not obligatory aspects of the invention, such an external shoe sole may incorporate one or more of the following characteristics, taken in any technically admissible combination: - The maximum overlap height in the holding zone is greater than at least 75% of the height of the rod at this holding zone. - The sole assembly comprises a second cushioning layer resting on an upper surface of the first cushioning layer, the second cushioning layer being in one piece and extending over at least 80% of the length of the sole assembly and over at least 60% of the width of the sole assembly. - The material constituting the second damping layer has a hardness at least 5% higher than the hardness of the material constituting the first damping layer. - The material constituting the second cushioning layer is more resilient than the material constituting the first cushioning layer. - The lateral and medial half-portions are assembled by contact between a left medial surface of the lateral half-portion and a left lateral surface of the medial half-portion. - At the level of the area of the heads of the metatarsals, the width of an upper surface of the medial half-portion is greater than at least 120% of a width of an upper surface of the lateral half-portion, when the two half-portions are assembled. - At the level of the calcaneal support zone, the width of an upper surface of the medial half-portion is greater than at least 120% of the width of an upper surface of the lateral half-portion or vice versa. - The maximum upper overlap height is located in the back third of the shoe.

[0014] The invention also relates to the tooling for producing one of the two half-portions described above, this comprising two impressions movable relative to each other in a direction inclined relative to the transverse direction of the shoe, by an angle of between 30 and 60° measured around the longitudinal axis of the shoe, in a trigonometric or anti-trigonometric direction.

[0015] Other characteristics and advantages of the invention will be better understood with the aid of the description which follows, with reference to the appended drawings illustrating, according to non-limiting embodiments, how the invention can be implemented, and in which:

[0016] [Fig-1] [Fig.l] is a front perspective top view of a shoe for right foot according to a first embodiment of the invention.

[0017] [Fig.2] [Fig.2] is an exploded view of the shoe of [Fig.l].

[0018] [Fig.3] [Fig.3] is a side view of the shoe of [Fig.l].

[0019] [Fig.4] [Fig.4] is a cross-sectional view along IV-IV of [Fig.3].

[0020] [Fig.5] [Fig.5] is a top view of two half-portions making up a first cushioning layer of the shoe in [Fig.l] before assembly.

[0021] [Fig.6] [Fig.6] is a top view of the two half-portions of [Fig.5] assembled.

[0022] [Fig.7] [Fig.7] is a longitudinal sectional view along VILVII of [Fig.6] of the two half-portions and a second cushioning layer making up the shoe of [Fig.l].

[0023] [Fig-8] [Fig.8] is a cross-sectional view of a tool for make a first half-portion making up the first cushioning layer of the shoe in [Fig. 1].

[0024] [Fig.9] [Fig.9] is a cross-sectional view of a tool for make a second half-portion making up the first cushioning layer of the shoe in [Fig.l].

[0025] In the remainder of the description, use will be made of terms such as "vertical", "upper", "lower", "top", "bottom", "transverse", "lateral", "medial", "right", "left", "horizontal", "anterior", "posterior", "front", "behind", "forward", "rear". These terms must be interpreted relatively in relation to the position that the shoe occupies on the foot of a user in normal posture, and the normal direction of advancement of a user. A normal posture is considered to be a configuration for which the sole is placed flat on a horizontal floor.

[0026] The terms "lateral" and "medial" are conventionally understood to mean facing outward and inward, respectively. Thus, the medial side of one foot or shoe faces toward the medial side of the user's other foot or shoe.

[0027] The term "longitudinal" refers to a heel-toe direction corresponding to the X axis while the term "transverse" refers to a medial-lateral direction (for a left foot) 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 frontal or coronal plane YZ is a plane perpendicular to an X axis. A sagittal plane XZ is a plane perpendicular to a Y axis. A transverse plane XY is a plane perpendicular to a Z axis.

[0028] In the description, 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. It is the “bottom” of the shoe. The sole is positioned opposite the sole of the foot. The “upper” is the upper part of the shoe enveloping the foot and possibly part of the ankle, with the exception of the “bottom” of the foot. It is the “top” of the shoe. The upper is secured to the peripheral edge of the sole. Note that certain elements of the shoe may form both a part of the sole and a part of the upper.

[0029] Figures 1 to 7 illustrate the construction of an external sole assembly according to a first embodiment of the invention in a sports shoe 1. The sports shoe 1 for the right foot shown is a running shoe, but could be any other type of sports shoe. This shoe 1 is shown in perspective, seen from above in [Fig.l]. It comprises an upper 2 surmounting a sole assembly 3. The upper 2 comprises a casing 21 intended to surround the user's foot. The casing may be locally multi-layered. The casing 21 defines the length L2 of the upper measured between a front end 2F and a rear end 2R of the upper 2. The upper 2 is generally closed in its lower part by a layer called the insole 3B. This layer is positioned facing the underside of the foot. The front ends 2F and rear ends 2R of the upper 2 are defined by the extreme points of the periphery of the lower opening of the upper corresponding to the junction between the insole 3B and the casing 21. The upper will not be described in detail below. It can be any upper construction.

[0030] In the description, several zones of the sole assembly are distinguished, as illustrated in [Fig. 3]. Zone ZI of the metatarsal heads TM corresponds to the zone located below the location of the metatarsal heads of the foot when it is shod. This zone ZI corresponds to a zone located between 15% and 30% of the length of the upper L2, from the anterior end 2F of the upper 2, the metatarsal heads generally being located between 20 and 25% of this length. Zone Z3 of the support of the calcaneus C corresponds to the zone located below the lower end of this bone of the foot, the calcaneus, when it is shod. This zone Z3 corresponds to a zone located between 5% and 10% of the length of the upper L2, from the posterior end 2R of the upper 2.

[0031] The sole assembly 3 comprises a superposition of layers between the ground and the underside of the foot, as illustrated in [Fig.4]. Starting from the foot, the first layer is a 3A insole. It is generally removably mounted inside the upper. The next layer, located below the 3A insole, is a 3B mounting insole. This second 3B layer is generally fixed to the lower peripheral edges of the upper 2. Finally, there is an external 3C sole assembly, under the 3B mounting insole. This external 3C sole assembly is generally fixed to the 3B mounting insole in any manner known per se, such as, for example, by gluing. This external 3C sole assembly is intended to come into contact with the ground. The 3A insole is optional. The 3B mounting insole is also optional. In the latter case, the upper can be directly fixed to the peripheral edge of the external 3C sole assembly.

[0032] The invention relates to a specific construction of the 3C external sole.

[0033] The outer sole 3C comprises a cushioning layer 31 extending over substantially the entire length of the outer sole, i.e., at least 90% of the total length of the outer sole. The cushioning layer 31 comprises a lower face 313 on which can be optionally fixed a wear layer 33 intended to come into contact with the ground.

[0034] According to the invention, the damping layer 31 is composed of two half-portions, a lateral half-portion 31 and a medial half-portion 31M. Each half-portion extends longitudinally over substantially the entire length of the external sole.

[0035] The lateral half-portion 3 IL extends in width between an external lateral face 315L and an internal medial face 314L. It comprises an upper surface 312L delimited by a vertical peripheral wall 31 IL extending upwards from the front edge, the lateral edge and the rear edge of the upper surface 312L. There is therefore no vertical wall at the medial edge of the upper surface 312L. A portion of this peripheral wall 31 IL is designed to partially cover the casing 21 of the upper 2. The overlap height Hr is not constant and varies along the peripheral wall.

[0036] The medial half-portion 31M extends in width between an internal lateral face 315M and an external medial face 314M. It comprises an upper surface 312M delimited by a vertical peripheral wall 31 IM extending upwards from the front edge, the medial edge and the rear edge of the upper surface 312M. There is therefore no vertical wall at the lateral edge of the upper surface 312M. A portion of this peripheral wall 31 IM is designed to partially cover the casing 21 of the rod 2. The overlap height Hr is not constant and varies along the peripheral wall.

[0037] The overlap height Hr at a point is defined by the vertical height of the direct contact area between the peripheral wall and the stem casing. The height is measured in a frontal plane YZ, as shown in [Fig.4]. The height corresponds to the distance between the projection of the high contact point on a sagittal plane XZ and the projection of the low contact point on the same sagittal plane XZ.

[0038] Once assembled, the two half-portions form a bowl 317 delimited by a bottom 312 and a peripheral wall 311.

[0039] The bottom 312 is defined by the upper surface 312L of the lateral half-portion 311 and the upper surface 312M of the medial half-portion 311M. The two upper surfaces 312L, 312M are therefore contiguous to form a continuous surface 312.

[0040] The peripheral wall 311 of the bowl 317 is defined by the vertical peripheral wall 31 IL of the lateral half-portion 3 IL and the vertical peripheral wall 31 IM of the medial half-portion 31M. The peripheral wall 311 is not necessarily continuous along the entire circumference of the bowl. It may be interrupted locally. The height of the peripheral wall 311 is not constant along the entire circumference of the bowl.

[0041] The inner medial face 314L of the lateral half-portion 3 IL and the inner lateral face 315M of the medial half-portion 31M are sized and arranged to come into direct contact when the half-portions are assembled together to form the damping layer 31. To maintain this assembly, a suitable adhesion means between these two faces 314L, 315M. Once connected, the internal medial face 314L and the internal lateral face 315M then define a common interface surface 316. The demarcation line L316 is defined as the line corresponding to the intersection between the interface surface 316 and the bottom 312.

[0042] According to one embodiment, the interface surface 316 is not planar but is a left surface. Thus, the lateral and medial half-portions are assembled by contact between the medial left surface 314L of the lateral half-portion 311 and the lateral left surface 315M of the medial half-portion 31M. The fact of being assembled according to a left interface surface 316 makes it possible to improve the strength of the assembly of the first damping layer 31, in a longitudinal direction X. Indeed, with a planar connection, when one half-portion is subjected to longitudinal shear stress relative to the other, it is likely that the two parts will be separated at their junction (damage to the adhesion means). With a left surface, the longitudinal shear strength does not result solely from the means of adhesion between the two parts but is reinforced by the interlocking of parts of these parts due to having a left interface surface.We have better resistance by mechanically absorbing shear forces.

[0043] Advantageously, the half-portions 3 IL, 31M are dimensioned so that the demarcation line L316 defines a particular curve as defined below.

[0044] According to one embodiment, at the level of the zone ZI of the heads of the metatarsals TM, the width W316M of the upper surface 312M of the medial half-portion 31M is greater than at least 120% of the width W316L of the upper surface 312L of the lateral half-portion 3 IL, when the two half-portions are assembled. This construction makes it possible to avoid having a hard point at the level of the heads of the first and second metatarsals. It is thus possible to have a localized zone where a sufficient cushioning layer is retained to provide better comfort at a location where pressure is exerted on the foot at the end of the stride, during the propulsion phase.

[0045] According to one embodiment, at the level of the zone Z3 of the support of the calcaneus C, the width W316M of the upper surface 312M of the medial half-portion 31M is greater than at least 120% of the width W316L of the upper surface 312L of the lateral half-portion 3IL or vice versa, that is to say, a configuration for which the width W316L of an upper surface 312L of the lateral half-portion 31L is greater than at least 120% of the width W316M of an upper surface 312M of the medial half-portion 31M. This construction makes it possible to avoid having a hard point in a central zone at the level of the heel, at the right of the lower end of the calcaneus bone. We can thus have a localized area where we keep a sufficient cushioning layer to provide better comfort to a place where exercise is carried out. pressure on the foot at the start of the stride, during the attack phase. The majority of athletes practice a "heel strike", that is to say they begin their stride by making contact with the ground at the heel. This results in a significant impact on the calcaneus bone. It therefore seems important to have good cushioning in this sensitive area and avoid any hard points in order to improve comfort.

[0046] This type of construction of a two-part damping layer makes it possible to obtain a zone of longitudinal rigidity resulting from the adhesion means used to assemble the two half-portions, at the interface surface 316. The adhesion means may be glue. However, it may be any other suitable means for bonding the two parts. This longitudinal stiffness of the damping layer improves the rolling of the foot by promoting the heel / toe rocking. This will therefore improve the propulsion phase of the stride.

[0047] Generally, a shoe is designed so that the lower face of the insole 3B connected to the upper 2 is secured to the upper surface of the outer sole 3C. This upper surface of the outer sole is therefore an interface surface which can be designated as a bonding board, last or footbed. The insole 3B is often bonded to the outer sole 3C. However, other means of securing can be envisaged.

[0048] According to a first embodiment illustrated in Figures 1 to 7, the external sole 3C comprises a second damping layer 32 interposed between the first damping layer 31 and the upper 2. The second damping layer 32 is in one piece and extends over at least 80% of the length LS of the sole 3 and over at least 60% of the width WS of the sole 3. This second damping layer 32 is intended to be inserted into the cup 317. The lower face 323 of the second damping layer 32 faces the bottom 312, that is to say, the upper faces 312M, 312L of the half-portions 31M, 31IL. The upper face 322 of the second damping layer 32 faces the lower face of the first mounting layer 3B connected to the rod 2. The peripheral edge of the second damping layer 32 is surrounded by a portion of the peripheral wall 311, i.e., the peripheral walls 311M, 31 IL of the half-portions 31M, 3 IL.This peripheral wall 311 extends upwards, beyond the upper face 322 of the second damping layer 32. In this example, the mounting insole 3B is thus fixed to the upper face 322 of the second damping layer 32. As a result, the lower medial and lateral parts of the envelope 21 of the upper 2, namely the quarters and the lateral and medial edges of the vamp / upper, are connected to the edges of the upper face 322 of the second damping layer 32 and are partially covered by the peripheral wall 311. Consequently, the covering height Hr of the upper by the peripheral wall 311 corresponds to the height . vertical of the direct contact zone between the peripheral wall and the envelope of the upper. This height is measured as defined previously. This height is measured from the edge of the upper surface of the external sole. Here, the measurement is therefore made from the edge of the upper face 322 of the second cushioning layer 32, to the upper edge of the peripheral wall 311 at the location where the measurement is desired.

[0049] According to the invention, the lateral wall 31 IL and / or medial wall 31 IM covers a first covering height HrZl of the stem at the level of the zone ZI of the heads of the metatarsals TM and, locally, a maximum covering height HrZ2M of the stem at the level of a holding zone Z2, posterior to the zone of the heads of the metatarsals, the maximum covering height HrZ2M in this holding zone being greater than at least four times the first covering height HrZl. The maximum covering height HrZ2M of the stem is measured at the level where the lateral and / or medial wall is the highest. At this level, the maximum covering height HrZ2M must therefore be at least equal to four times the first covering height HrZl.

[0050] This construction allows for a low upper overlap height, at the front of the shoe, which corresponds to the front third of the shoe, where it is necessary to be able to easily flex the upper, particularly at the level of the heads of the metatarsals, for good rolling of the foot. Conversely, in the rear part of the shoe, which corresponds to the posterior two-thirds of the length L2 of the upper, this construction allows for a greater upper overlap height to protect the foot and ensure better stability. For example, there will be better stability when the lateral part of the upper opposite the Lisfranc joint or tarsometatarsal joint of the foot is covered when the foot is in the shoe. According to another example, there can be better stability and protection when the quarters at the level of the internal and / or external malleoli of the foot are covered when the foot is in the shoe.In the latter case, the maximum overlap height HrZ2M can advantageously be located in the posterior third of the length L2 of the rod. This amounts to having a smaller holding zone Z2, corresponding to this posterior third instead of two thirds.

[0051] According to one embodiment, the maximum overlap height HrZ2M in the holding zone Z2 is greater than at least 75% of the height H2Z2M of the upper at this holding zone. This construction allows a large overlap zone in height of the upper which ensures better support of the foot because little of the upper is not contained by the peripheral wall 311 at the holding zone Z2.

[0052] According to an exemplary embodiment, the shoe 1 comprises an upper 1 comprising an envelope 21 and a sole 3 comprising a lateral half-portion 3 IL and a half- medial portion 31M, the lateral and medial half-portions being secured to each other to form a cushioning layer 31, the lateral half-portion comprising a lateral wall 31 IL extending upwards to cover at least one lateral portion 21 IL of the upper casing and / or the medial half-portion comprising a medial wall 31 IM extending upwards to cover at least one medial portion 21 IM of the upper casing. In this example, the cushioning layer 31 defines a cup 317 delimited by a bottom 312 extending over at least 80% of the length LS of the sole assembly and over at least 60% of the width WS of the sole assembly. The damping layer has a thickness E31 delimited by the bottom 312 of the bowl and a lower surface 313. The height HZ2 of the peripheral wall 311 is defined as the height between the peripheral edge of the bottom 312 of the bowl and the top of the lateral / medial peripheral wall.In this example, the maximum height HZ2M of the peripheral wall 311 is greater than at least twice the maximum thickness E31M of the cushioning layer 31 measured in a frontal section YZ of the shoe at the longitudinal level where the height of the peripheral wall is maximum, as illustrated in [Fig.4]. This construction is possible because the cushioning layer is in two parts. Indeed, molds can be used to produce higher lateral / medial walls. Consequently, these high walls provide better lateral support and better protection of the foot.

[0053] Advantageously, the first damping layer 31 and the second damping layer 32 are made of different materials.

[0054] The material of the first cushioning layer 31 must have good mechanical strength so that the peripheral wall 311 provides sufficient lateral support to ensure the desired stability. Furthermore, this material must also have good abrasion resistance in order to reduce its wear in contact with stones and other roughness of the ground. Finally, this material must also have cushioning characteristics because it also contributes to the cushioning of the shoe.

[0055] The material of the second cushioning layer 32 is protected by the first cushioning layer 31. However, it must be soft and resilient in order to improve the comfort and cushioning of the shoe. It does not need to have good abrasion resistance, which allows for a greater choice of material to obtain the desired cushioning characteristics.

[0056] Advantageously, the material constituting the second damping layer has a hardness at least 5% higher than the hardness of the material constituting the first damping layer. This hardness is preferably measured in Asker C. Good damping associated with good resistance is obtained with damping layers having a hardness of between 40 and 50 Asker C.

[0057] Resilience is generally measured by a classic test which consists of dropping a mass (for example 5 kg), from a given height (for example 23.5 cm), onto the sample to be characterized (here, part of the external sole). The rebound height of the mass is then measured. It is this height which characterizes the resilience. This resilience can be qualified with a test, according to standard D3574.

[0058] Advantageously, the material constituting the second damping layer is more resilient than the material constituting the first damping layer. This can result in a hysteresis (D3574, in %), dissipated elastic energy, of the second damping layer preferably less than at least 10% compared to the hysteresis (D3574, in %) of the first damping layer.

[0059] The first damping layer 31 and the second damping layer 32 are made of a material composed of cellular foam, for example, one of the following materials: - Thermosetting material: Ethylene-Vinyl Acetate (EVA), Polyurethane (PU) - Thermoplastic elastomer material: Thermoplastic Polyurethane (TPU), Thermoplastic Elastomer based on polyester (TPEE), Polyether block amide (PEBA), Thermoplastic Polyolefin (TPO / POE) - A mix of the previous materials.

[0060] These damping layers can be obtained by injection, compression or by additive process such as 3D printing. The injection can also be carried out with materials in the supercritical state. The production process can also include an expansion step in an oven under controlled temperature and pressure conditions.

[0061] According to a second embodiment, the outer sole assembly does not comprise a second damping layer 32. In this case, the upper surface of the outer sole assembly therefore corresponds to the upper surface 312 (312M + 312L) of the first damping layer 31. The mounting insole 3B is then fixed directly onto the first damping layer 31. The covering height Hr of the upper by the peripheral wall is measured from the edges of the upper surface 312 of the first damping layer 31. The details and characteristics described previously for the first embodiment apply mutatis mutandis, except for the second damping layer 32.

[0062] The invention also covers a method for producing half-portions intended to be assembled together to form a cushioning layer for a shoe as defined above. This method is characterized in that the impressions M1, M2 of the tooling for producing these half-portions are movable relative to each other in a direction V inclined relative to the transverse direction. Y of the shoe, with an AV angle between 30 and 60° measured around the longitudinal axis X of the shoe, in a trigonometric or anti-trigonometric direction, as illustrated in figures 8 and 9. This specific construction of these tools allows the use of space-saving, economical tools and allows the production of well-finished parts with a high peripheral wall height.

[0063] The invention is not limited to the embodiments previously described. It is also possible to combine these embodiments. The invention extends to all embodiments covered by the appended claims. References

[0064] 1. Shoe

[0065] 2. Stem

[0066] 21. Envelope

[0067] 3. Soling

[0068] 3A First cleanliness

[0069] 3B First assembly

[0070] 3C. External sole [0071 ] 31. First damping layer

[0072] 31L / M. Half Lateral / Medial Portion

[0073] 311L / M Peripheral wall Lateral / Medial

[0074] 312L / M Upper Surface Lateral / Medial

[0075] 313 Lower surface

[0076] 314L / M Medial face of the Lateral / Medial half-portion

[0077] 315L / M Lateral face of the Lateral / Medial half-portion

[0078] 316 Common interface surface

[0079] L316 Demarcation line

[0080] 317 Bowl

[0081] 32. Second damping layer

[0082] 322 Upper surface

[0083] 323 Lower surface

[0084] 33. Wear layer

[0085] ZI Metatarsal head zone

[0086] Z2 Holding Zone

[0087] Z3 Calcaneus support zone

Claims

Claims

1. Shoe (1) comprising: - an upper (2) comprising a casing (21) and - a sole assembly (3) comprising a lateral half-portion (3 IL) and a medial half-portion (31M), the lateral and medial half-portions being secured to each other to form a cushioning layer (31), the lateral half-portion comprising a lateral wall (31 IL) extending upwards to cover at least one lateral portion (21 IL) of the casing of the upper and / or the medial half-portion comprising a medial wall (31 IM) extending upwards to cover at least one medial portion (21 IM) of the casing of the upper, characterized in that the lateral and / or medial wall (31 IL, 31 IM) covers a first covering height (HrZl) of the upper at the area (Zl) of the heads of the metatarsals (TM) and, locally, a maximum covering height (HrZ2M) of the stem at the level of a holding zone (Z2), posterior to the area of the heads of the metatarsals,the maximum overlap height (HrZ2M) in this holding zone being greater than at least four times the first overlap height (HrZl).,

2. Shoe (1) according to claim 1 characterized in that the maximum overlap height (HrZ2M) in the support zone (ZM) is greater than at least 75% of the height of the upper (H2Z2M) at the level of this support zone.

3. Shoe (1) according to one of the preceding claims, characterized in that the sole (3) comprises a second damping layer (32) resting on an upper surface (312) of the first damping layer (31), the second damping layer being in one piece and extending over at least 80% of the length (LS) of the sole and over at least 60% of the width (WS) of the sole.

4. Shoe (1) according to the preceding claim characterized in that the material constituting the second cushioning layer has a hardness at least 5% higher than the hardness of the material constituting the first damping layer.

5. Shoe (1) according to one of claims 3 or 4 characterized in that the material constituting the second cushioning layer is more resilient than the material constituting the first cushioning layer.

6. Shoe (1) according to one of the preceding claims, characterized in that the lateral and medial half-portions are assembled by contact between a left medial surface (314L) of the lateral half-portion (3 IL) and a left lateral surface (315M) of the medial half-portion (31M).

7. Shoe (1) according to one of the preceding claims, characterized in that, at the level of the zone (Zl) of the heads of the metatarsals, the width (W316M) of an upper surface (312M) of the medial half-portion (31M) is greater than at least 120% of a width (W316L) of an upper surface (312L) of the lateral half-portion (3 IL), when the two half-portions are assembled.

8. Shoe (1) according to one of the preceding claims, characterized in that, at the level of the zone (Z3) of the support of the calcaneus (C), the width (W316M) of an upper surface (312M) of the medial half-portion (31M) is greater than at least 120% of the width (W316L) of an upper surface (312L) of the lateral half-portion (3 IL) or vice versa.

9. Shoe (1) according to one of the preceding claims, characterized in that the maximum covering height (HrZ2M) of the upper is located in the rear third of the shoe.

10. Tooling for producing one of the two half-portions (3IL, 31M) as defined in one of the preceding claims, characterized in that it comprises impressions (Ml, M2) movable relative to each other in a direction (V) inclined relative to the transverse direction (Y) of the shoe, by an angle (AV) of between 30 and 60° measured around the longitudinal axis (X) of the shoe, in a trigonometric or anti-trigonometric direction.

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