FR2838613A1 - Shoe bottom comprises upper and lower sheet in heel area with elastic element between sheets and intermediate sheet extending transversely between lateral edge of upper and lower sheet - Google Patents

Abstract

The heel area of the outer bottom comprises an upper sheet (20), a lower sheet (30) and an elastic element located between the two sheets. An intermediate sheet (40) extends transversely between the lateral edge of an upper and lower sheet and the medial edge of the other lower and upper sheet.

Description

SHOE SOLE

  The present invention relates to a shoe intended in particular for walking or running

  in the mountains and more particularly a sole for such a shoe.

  Running shoes with a cone foot, generally designed with cushioning means, in particular at the heel, to absorb repeated shocks occurring during crowds or in places which are most affected by shocks, and avoid microphone

  trauma to the user's joints.

  More recently, shoes have also been proposed aiming to limit the effects of excessive proration or supination of the foot and adapting better to biomechanics and to

movement of the foot.

  The known running shoes are generally designed especially to cooperate with

  flat floors on which the tests are generally held.

  However, the development of sports competitions of t.vpe "raid", including various sporting activities taking place in a mountainous context and including in particular

  mountain races imply new constraints on shoes and users.

  In fact, mountain races generally take place on uneven, sloping, non-"flat" soils, that is to say with many asperites, rockeries, and may even have slopes, it is admire transverse sp entes in relation to the axis of the race. 2 0 As there are currently only a few running shoes on the market that are really intended for such conditions, there are many problems for runners.

  trauma and risk of accidents.

  The object of the present invention is to remedy these drawbacks and to provide a shoe, in particular a running shoe, comprising an adapted sole making it possible to improve the grip of the shoe on uneven terrain, on slopes, on slopes and also allowing

  to absorb accidents and uneven ground.

  Another object of the present invention is also to avoid the problems due to a

  excessive proration or supination of the user's foot.

  This object is achieved in the shoe according to the invention which is of the type comprising an upper and an external sole assembly by the fact that the external sole assembly comprises in the heel area an upper plate, a lower plate and at least one elastic element interposed between the two plates on each lateral and medial side of the sole, each elastic element being

  able to be used during an exertion effort, cant mainly in the vertical direction.

  By this construction the sole assembly will react to any effort exerted essentially in the vertical direction either from the medial side, or from the side lateral to said sole assembly, and will perfectly adapt to a configuration in slope to the ground, or to any asperity of the latter in a

  direction transverse to the direction of travel.

  Preferably, each elastic element has a shape of a pin extending in the direction

  transverse of the shoe between the upper plate and the lower plate.

  According to a preferred embodiment, the two pins have a common branch, which improves the homogeneity and the stability of the sole assembly. In fact, the outer sole assembly comprises in the heel area an elastic element in the form of a Z (or inverse Z) extending transversely to the longitudinal direction of the shoe and capable of responding to stresses exerted either on a medial pad, either on a lateral dimension of the shoe. In any case, the invention will be better understood and other characteristics of it

  will be highlighted using the following description with reference to the schematic drawing

  appendix by representing by way of nonlimiting example several preferred embodiments

  and in which: - Figure 1 is a rear perspective view of a sole part according to the invention incorporated in a shoe, - Figure 2 is a side view of the sole part of Figure 1, Figure 3 is a cross-sectional view of a sole assembly according to the prior art on a slope land, - FIG. 4 is a cross-sectional view of a sole assembly according to FIGS. 1 and 2, - FIG. 5 is a view similar to FIG. 4 of the sole assembly on a slope land, - FIG. 6 is a view similar to FIG. 5 in another example of slope, - FIGS. 7 and 8 show views similar to FIGS. 5 and 6 illustrating the behavior sole assembly according to the invention in the presence of asperites,

  FIG. 9 is a view similar to FIG. 4 according to another embodiment.

  Figures 1 and 2 illustrate a first embodiment of the sole assembly 1 according to the invention associated with a shoe upper 2, indicated in phantom in Figure 1. In ['together

  of the figures it is the sole assembly of a right foot shoe which is represented.

  The sole assembly 1 comprises an insert formed by a plate 10 of rigid and elastic material extending substantially over the entire length of the sole assembly, that is to say from a rear end 12 intended to receive the heel, up to an end before 13 intended to receive

  toes, and an outer or walking sole 14, shown in phantom in Figure 1.

  This plate 10 is made of a substantially rigid and elastic material such as a composite based on woven or nonwoven fibers such as glass fiber, carbon, poly-paraphenylene terephthalamide (KEVLAR), metallic fibers, etc., and whose matrix is a resin

  thermosetting or thermoplastic polymer.

  As examples of fibers which can be used in these composites, mention may be made of those given in the table below which mentions the type of weaving plies and the

  mechanical characteristics of these networks or fibrous layers.

  Weaving fibers Contrary to upper breakage Upper module with Unidirectional Glass 700 MPa 25000 Mpa Multidirectional Glass 350 MPa 12000 Mpa Unidirectional Carbon 1500 MPa 70000 Mpa Multidirectional Carbon 700 MPa 35000 MPa At the heel area 12, the plate 10 forms an upper plate 20, to this upper plate is connected a lower plate 30 which may be in the same material as the upper plate or in a material having equivalent or different properties depending on

the research effect.

  Between the two upper 20 and lower 30 plates extends a third intermediate plate 40 extending in transverse direction relative to the longitudinal direction L of the sole assembly and connecting the lateral edge 21 of the upper plate 20 to the medial edge 31 of the plate

  lower 30, forming a Z in transverse direction (cf. FIG. 4).

  Of course in the case of the shoe of the left foot, the Z will be opposite.

  1 0 In fact, whatever the right or left foot considered, the direction of the Z does not matter, what is important is that an elastic element or pin is provided and active on each medial, lateral side of the shoe. In fact, a different form of a reverse Z or Z could be conceivable for the elastic assembly 50, 60, provided that the above requirements are met. These trotting plates 20, 30, 40 thus form a double elastic pin respectively lateral 50 and medial 60, each elastic pin 50, 60 being able to be stressed during an exerted effort, cant essentially in the vertical direction, either on the side medial, either on the lateral side

of the shoe.

  In other words, the outer sole assembly comprises in the heel area an elastic element 50, 60 in the form of a Z or a reverse Z extending transversely to the longitudinal direction L of the shoe and capable of responding to stresses exerted either on a side

  medial, either on a lateral side of the shoe.

  Preferably, as shown in FIG. 4, the space between each respectively upper 20 and lower 30 plate is filled by an element or damping material 75, 76 of

  Foam type or similar and for example foam, EVA, polyethylene, polyurethane, ... etc.

  The density of the foam may be different on the medial and lateral sides depending on the desired effect. 75 will be called the damping element associated with the side pin 50, and 76 element

  shock absorber associated with medial pin 60.

  Thus, if we are looking for a sole assembly allowing maximum shock absorption during the impact of the heel on the ground, which normally occurs on the lateral side of the heel, the shock absorbing element 76 situated on the lateral side will be rather damping while The damping element 75 located on the medial side will be more elastic since it is the damping element 76 situated on the lateral side which will be compressed by the deformation of the medial pin 60 during this impact. The advantage of the sole assembly according to the invention is especially highlighted during use on slopes or on uneven terrain. FIG. 3 illustrates the behavior of a traditional sole assembly consisting of an intermediate sole 100 and an external sole 101 in the event of slopes. In this case, the intermediate sole 100 being of a homogeneous, relatively rigid material, no adaptation to the reverse is possible and the support of the foot materialized on the figure by the upper surface 102 of the sole is found perpendicular to the slope of the terrain T and therefore non-horizontal or from the risk of injury, sprains, etc. As shown in Figure 5, in the case of a side slope, that is to say the terrain T slopes (or slopes) from the top to the teas, from the lateral side to the medial side, the medial pin 60 will be stressed and will close more or less depending on the angle of the slope while the lateral pin 50 will remain open, thus providing an upper surface almost 20

horizontal for the foot.

  In the event of a slope in the other side, that is to say the medial side as shown in FIG. 6, it is on the contrary the lateral pin 50 which will be requested and the medial pin 60 which will remain 1 0 open while providing a substantially horizontal support for the foot. Risk of injury

wind therefore significantly reduced.

  The double pin 50, 60 in transverse direction according to the invention therefore makes it possible to compensate for the asymmetric forces occurring in the transverse direction of the sowing.

when using.

  1 5 The behavior of the sole assembly according to the invention is similar in the case of asperites

  (pebbles, ... etc.) located rather lateral or medial side as illustrated by figures 7 and 8.

  In the case where the asperitis is rather medial side (figure 7) it is the upper lateral pin

  and the damping element combines 75 which work the most.

  In all cases the pins 50, 60 make it possible to compensate for the unevenness of the ground and of

  2 0 ensure a substantially horizontal support for the foot.

  In the opposite case where the asperitis is rather lateral (figure 8) it is the medial pin

  lower 60 and the shock absorber element 76 which work the most.

  The degrees of stiffness of each pin 50, 60 and of damping of each associated damping element respectively 75, 76 may be similar or different depending on the

2 5 effete research.

  Thus, as explained above, the damping element 76 can be chosen to be more damping than the element 75 and the associated pin 60 will eventually be less stiff than the pin 50 to allow maximum shock absorption to be obtained during ['impact

  seeding with the soil, which generally occurs on the lateral side.

  Such a construction also makes it possible to avoid the phenomenon of hyperproration on impact.

heel.

  The damping elements 75, 76 can also be chosen in the form of interchangeable blocks according to the weight of the user, running speed, shape of the terrain, etc. FIG. 9 illustrates another embodiment of the invention in which additional elastic steps 80 extend transversely from the upper plate 20, respectively lower 30 to the transverse branch 40. The end of these elastic steps 80 is free and slides on said transverse branch 40. These elastic steps 80 serve to give the sole assembly additional stability in the transverse direction, without

  both generate the operation of the double SO rod, 60.

  Wiles can be produced in different ways, for example in the form of elastic steps 80 coming from each of the plates respectively upper 20, lower 30 or in the form of independent elements made of PU or other material having the stiffness and elasticity. e wishes. In the cases shown, the plate 10 is integral with the upper plate 20 and produced

in the same material as this one.

  The advantage of having an elastic plate 10 also at the front of the foot is that it provides

  a propulsion / revival effect when the foot leaves the ground.

  A plate 10 extending substantially over the entire length of the sole assembly also provides the torsional rigidity and stability in the desired transverse direction and therefore constitutes a

  sort of chassis preventing overall deformation of the sole assembly.

  The advantage of having the plate assembly 10, pins 50, 60 in one piece also allows

  a great homogeneity of realization of the whole sole assembly.

  However, for reasons of ease of manufacture, modularity of the characteristics or others, it may be advisable to produce the elastic plate 10 and the elastic heel assembly, consisting of pins SO, 60, in separate blocks fastened together during the

realization of the final sowing.

  Likewise, each pin 50, 60 can be made independently and be assembled at

the other pin in the final phase.

  Finally the elastic block heel 50, 60 can be provided independently of any elastic plate 10, in the case where we are only looking for the effect of transverse elasticity at the level

heel.

  2 5 Of course, the present invention is not limited to the embodiments described but

  includes all similar or equivalent embodiments.

Claims (14)

  1- Shoe of the type comprising an upper and an external sole assembly, characterized in that the external sole assembly comprises in the heel area an upper plate (20), a lower plate (30) and at least one elastic element (50, 60) interposed between the two plates on each lateral and medial side of the sole assembly, each elastic element (50, 60) being able to be   stresses during an effort exercising essentially in the vertical direction.   2- shoe according to claim 1, characterized in that an intermediate plate (40) stetends in transverse direction between the lateral edge of a respectively upper (20), lower (30) plate and the medial edge of the other plate respectively lower (30), upper (20).   3- shoe according to claim 2, characterized in that the intermediate plate forms an elastic pin respectively (50, 60), with each of the plates respectively   upper (20), lower (30) and arranged respectively laterally, medially.   4- Shoe according to any one of claims 1 to 3, characterized in that   each elastic element respectively (50, 60) has substantially the same elasticity.   - Shoe according to any one of claims 1 to 3, characterized in that the   elastic elements (50, 60) have different elasticities.   6- Shoe according to claim 5, characterized in that ['elastic element (50) laterally has a higher stiffness than [' elastic element (60) has 2 0 professional.   7- Shoe according to claim 5, characterized in that ['elastic element (60) medially has a higher stiffness than the elastic element (50) has laterally.   8- Shoe according to any one of claims 1 to 7, characterized in that the   upper plate (20) is integral with a plate (10) of elastic material extending   substantially over the entire length of the sole.   9- Shoe according to claim 8, characterized in that the plate (10) of material   elastic remains at least as far as the metatarsophalangeal joint zone.   - Shoe according to any one of claims 8 or 9, characterized in that the   plate (10) is made of rigid and elastic material such as a composite material.   11- Shoe according to any one of claims 8 to 10, characterized in that the   plate (10) forms a single piece with the upper plate (20).   12- Shoe according to any one of claims 3 to 9, characterized in that the   double elastic pin (50, 60) forms a single piece.   3513- Shoe according to claim 12, characterized in that the double elastic pin (50, 60) forms a single piece independent of at least one (20, 30) of the plates. R, superior and nervous.   14. Shoe according to any one of claims 2 to 13, characterized in that   additional elastic means (80) wind provided in transverse direction from at least 283 861 3   one of the plates respectively upper (20), lower (30) up to the branch transverse (40).   - Shoe according to any one of claims 1 to 14, characterized in that   wind damping means provided between the upper and lower plates.   16- Shoe of the type comprising an upper and an external sole assembly, characterized in that the external sole assembly comprises in the area of the heel an elastic element in the shape of a Z extending transversely to the longitudinal direction of the shoe and capable of responding to   stresses exerted either on a medial side or on a lateral side of the shoe.   17. Shoe sole according to any one of claims 1 to 16.