FR2520986A1 - IMPROVED ATHLETICS SHOE - Google Patents

Abstract

THIS ATHLETICS SHOE FOR RUNNING AND OTHER SPORTS INCLUDING RUNNING, INCLUDING A UPPER 10 ATTACHED TO A SOLE SET 12 INCLUDING A SOFT OUTSOLE 32 AND A SOFT MIDSOLE 33 IN POLYMER FOAM, INCLUDES ONE ELEMENT REINFORCEMENT RIGID 37, MADE SEPARATELY AND ENGAGES AND GLUES IN SLOT 42 BETWEEN UPPER 44 AND BOTTOM 46 LAYERS OF INTERCALER 33. REINFORCEMENT ELEMENT 37 HAS A APPROPRIATE CONFIGURATION TO EXTEND UNDER A SELECTED REGION OF THE FOOT OF THE USER.

Description

The present invention relates to shoes

  safe athletics, and in particular running or jogging shoes of the type with first cleanliness in

  closed cell polymer foam.

  Current running and jogging shoes, as well as other types of athletic shoes, are

  usually made with a strapless sole assembly

  tified having an interlayer, or double, of poly-

  mother with closed cells covering a sole properly

  said, or piece, and glued to it flexible Les chaus-

  racing sures are mainly of two types, one of which will be called "closed" differs from the second which will be

  says "open" especially that shoes of the type says "iron-

  mé N do not have a first but instead have a closed fabric underside that completely surrounds the foot like a slipper In athletic shoes of the "open" type the vamp is open to

  its lower part and is closed by a first covering

  See the interlayer, or double The foam interlayer is used in both types of shoes because of its lightness and its shock absorbing properties to protect the wearer's foot against

shocks during the race.

  It is therefore understood that in the following

  te of this description we will use the expressions

  closed type "and" open type "to designate the shoes

  sport socks of the closed upper type and the upper type

open comb, respectively.

  Closed-type athletic shoes are

  generally preferred to open type shoes by-

  what they are usually more comfortable than the first ones Due to the absence of the first one, however,

  closed type shoes are usually less sta-

  as open type shoes because

  concentrated ions develop during the race in the foam interlayer and deteriorate it by

  non-uniformly to an unacceptable extent.

  The foam interlayer therefore loses much of its effectiveness.

  cited as shock absorber of the gait of this non-uniform deterioration, The deterioration of the foam interlayer results from the continuous stresses which develop from the

  does repeated and cyclic deformation and loosening

  of this part during the race The deterioration

  tion can take the form of a compressive deformation

  permanent, or compression deformation, of the inter-

  calaire It can also occur without deformation of

  compression in the event of rupture or loss of iron cells

mées of the foam interlayer.

  Deterioration of the interlayer is frequently

  due to the concentrated configuration of

  forces resulting from the particular racing style of a

  vreur For example, a localized deterioration of the inter-

  calaric can occur on the rear outer edge of the

  shoe in the region of the back of the heel A dete

  rioration of the interlayer also occurs throughout the region thereof which absorbs shocks, due to the

  compression forces which cause lateral expansion

  the of the insert towards the outside of the shoe.

  A localized deterioration of the interlayer along the medial inner or lateral outer edges of the shoe is particularly troublesome because it tends

  cause the tilting shoe to lose its stability when

  the runner's foot hits the ground In order to compensate for the instability, the runner can modify his running style, which then risks causing injuries to the foot or ankle. Furthermore, the problem of deterioration

  of the insert is complicated by the fact that it over-

  frequently occurs before normal wear of the sole

sour, or piece.

  In an open type athletic shoe, the foam midsole also deteriorates with use, but the deterioration is not as irregular as the

  deterioration of the interlayer of an athletic shoe

  closed type tism because the grip of the open type athletic shoe disperses to a certain extent the forces acting on the interlayer as long as the first itself does not degrade, Although a first indeed disperses in to some extent the forces acting on the foam interlayer, it has been found that if the former is made rigid enough to distribute the forces on the foam interlayer appropriately, the shoe becomes too

  lasts, which significantly harms user comfort.

  On the other hand, the first not very resistant which satisfied

  make the user comfort requirements risk

  to deteriorate, thereby causing irregular deterioration

  excessive lider of the interlayer, even in the shoes

open type rt.

  Considering what has just been exposed, the goal

  general purpose of the invention is to provide a new structure

  to improve the stability of the shoe

  athletics, reduce the deterioration of the interca-

  and strengthen the anatomical support of the foot

  the user, all without making the shoe un-

  extremely hard and without using any elements

  ques which reduce the volume of housing of the foot of the vamp A more particular object of the invention is to provide a new structure to greatly reduce the

  irregular deterioration of the interlayer of a shoe

  of the closed type without resorting to a first and, without otherwise affecting the comfort qualities of a shoe of the closed type In general, this is achieved by placing the foam interlayer in contact with a special element shaped in a region located under the upper surface of the interlayer to make a selected surface of the latter rigid In the form of

  shown embodiment, the shaped element is

  killed by a thin, rigid, almost inextensible plate, or, as it can be called, reinforcing element,

  which is placed between and glued to two layers of Vin-

  tercalar at a level between the upper surfaces

  lower and lower of it, The element of Xenfor-

  cement must be rigid enough to effectively distribute the forces acting on the shoe over the entire region opened by the element in order to thus ensure a distribution

  more uniform forces acting on the shoe

safe.

  Because the reinforcing element of the

  vention is effective with regard to the reinforcement of the foam support under the foot, its geometric shape is particularly important In the embodiment shown, the shape of the reinforcement element is such that it is located under all of the

  rear part of the foot or heel region of the user

  torus and extends forward approximately to the first, second and third metatarsal heads to extend below the inner arch, but not the arch

  outside of the user's midfoot.

  Due to the choice of region covered by

  the reinforcing element, this does not interfere with the need

  bending the shoe We can therefore make it as rigid as possible, but not to the point of becoming brittle.

  By dispersing the forces that act on the

  tercalaire, the reinforcement element according to the invention greatly reduces the irregular, harmful deterioration of the interlayer and clearly prolongs the life of the shoe. The bonding of the reinforcement element on the opposite layers of the interlayer has by itself to limit the lateral expansion of the interlayer towards the outside due to the compressive forces, which reduces

  the deterioration of this interlayer due to this dilata-

  outward deterioration The deterioration resulting from this expansion of the interlayer towards the exterior is manifested by failures of the cell walls which are caused by the shearing forces acting on the material of the interlayer,

  By placing the reinforcing element of the invention

  tion at an intermediate level in relation to surfaces

  upper and lower tab and in use

  sant a flexible first (that is to say a closed type structure without a first), the support system of the

  foot is advantageously lowered The layer of the interca-

  the foam sheet located under the reinforcement plate only serves to absorb the forces resulting from the impact of the foot on the ground The layer of interlayer which covers

  the reinforcing element also acts as cushioning

  shock absorber and further resiliently supports the foot of the user so that the shoe is not felt as hard due to the presence of the reinforcing element In addition, the foam interlayer which covers the element of strengthening in the

  region of the back of the user's foot has a thick-

  enough to closely fit the shape of the user's heel, improving comfort

of the shoe.

  By reinforcing the foam interlayer as described above, the degree of penetration of the runner's foot into the interlayer is advantageously reduced by selectively increasing the rigidity of the interlayer material By extending the reinforcing element up to 'to a region where it is located under the part of

  the interlayer which supports the inner vault or mo-

  yenne, the reinforcing element and the interlayer

  foam also act advantageously as a dynamic support

  comfortable arch molding This aspect of the invention eliminates the need for plantar arch linings or other conventional inserts for arch support which adversely reduce the usable volume of

  the upper of the shoe to receive the foot.

  The reinforcement element of the interlayer according to the invention can advantageously be manufactured separately from the shoe as a current product for the use of podijtres and orthopedists to modify

  running shoes already made for the purpose of

  think of asymmetries of the legs and feet or other anomalies, So far, various reported elements of shoes, such as heel cushions, supports

  arch and other orthopedic devices, were used

  read for this purpose All have in common the disadvantage of causing a certain inconvenience because they reduce the volume

  useful shoe upper.

  Unlike these previously reported items

  laughing, the reinforcing element according to the invention is located in the interlayer and not in the upper, the entire volume of which remains usable for comfortably covering

the user's foot.

  Considering what has just been explained, another object of the invention is to provide an athletic shoe comprising a new interlayer having a reinforcement formation situated between the upper and lower surfaces of the foam interlayer to reinforce it. ci along a chosen surface under the foot. Another object of the invention is to provide an athletic shoe having a new manufacturing midsole in which a special shaped element cooperates with the body of the foam midsole to reduce or

  delay the harmful irregular deterioration thereof.

  Another object of the invention is to provide: a new midsole shoe provided with an arch support; an economical and easy-to-make midsole shoe that achieves the above-mentioned goals; to provide a new, current element for modifying existing athletic shoes to take into account the particular anatomy or asymmetries of a user;

  to provide a new method of using the

  mentioned above which modifies the shoe to compensate for different body weights and / or different leg lengths. Other goals of the intention apoar A Itro Qnt during

  of the description which will follow made with reference to

  appended drawings given solely by way of example and in which: FIG. 1 is a perspective view of a left athletic shoe to which the principles of the invention are applied; Fig 2 is a longitudinal section of the athletic shoe shown in Fig 1; Fig 3 is a horizontal section along line 3-3 of Fig 2 and showing the configuration of the element

  reinforcement according to one embodiment of the invention

  tion; Fig 4 is a cross section taken along line 4-4 of Fig 2; Fig 5 is another cross section along line 5-5 of Fig 2; Fig 6 is a cross section similar to that of Fig 4 but showing a variant applicable for runners who turn their feet too inward; and Fig 7 is another cross section similar to that of Fig 4 but showing another variant for

  runners who turn their feet too far outside.

  In the present description, the expression "region

  posterior "is used to designate the heel region of the foot containing the calcaneum, the expression" region

  average "is used to designate the intermediate region

  re of the foot adjacent to the posterior region and comprising the five bones linked together to form the beginning of the arch of the foot, and the expression "anterior region" is used to designate the region of the foot adjacent to the

  middle region and including metatarsals.

  Although the reinforcement element of the interlayer of the invention is applied to an athletic shoe of the closed type in the embodiment shown, it should be noted that the principles of the invention also apply to athletic shoes. athletics at first in which this first is flexible enough not to harm the functions of the special reinforcement element according to the invention.

  Referring to Figs 1 and 2, the athletic shoe

  tism to which the principles of the invention are applied includes a closed type upper 10, a sole assembly 12 located under the upper 10 and a flexible first flexible mold 13 (Fig 2) The upper 10 has a closed fabric underside, so that it completely surrounds

  the foot in the usual way The first 13 is dis-

  placed in the rod 10 and covers the underside 15 with fabric.

  The upper 10 can have any suitable conventional structure and is shown as comprising a toe 14 for the toes, a slap 16, a heel 18, a reinforcement 20 enveloping the rear of the heel, a groove 22

  extending along the slap 16 for lacing, desi-

  hindered by 24, a beaded tongue 26 extending the

  along the groove 22 and a circular bead 28 extends

  dant around the opening of introduction of the foot in the

shoe.

  The sole assembly 12 of the shoe is a laminated structure with flexible outsole 32 in contact with

  the ground and an insert 33 which absorbs shock, re-

  covers the sole 32 and is glued to it The outsole 32 can have any suitable structure

  and can be made of synthetic or natural rubber.

  The surface of the outsole 32 in contact with the ground

  is preferably formed with a suitable design 36 The

  tercalar 33 is roughly coextensive with the outsole 32 The upper 10 is glued or otherwise appropriately attached to the interlayer 33 along its

lower part 15 in fabric.

  The interlayer is made of an appropriate material,

  a closed cell polymer foam shock absorbing.

  For example, the interlayer 33 can be formed of a mixture

  ethylene vinyl acetate and polyethylene

  then crosslinked with a peroxide at the time of molding.

  The foam is preferably a light material with a specific mass of the order of 0.2 grams per cubic centimeter, or slightly lower. The interlayer 33 'has its greatest thickness in its part 39 corresponding to the posterior region

  or at the heel where it is under the heel or region around

  of the user's foot In the form of a

  shown, the heel part 39 of the interconnect

  the web has an approximately uniform thickness The interlayer 33 tapers towards the front in an intermediate part situated in front of the heel part 39 in the form of a wedge or triangle top as shown in the

  Fig 1 and 2 This corner can be formed separately from the in-

  tercalar 33 and can be arranged above or below

of it.

  In the embodiment shown, the element

  reinforcement sheet of the interlayer according to the invention has the form of a thin, rigid, flat layer 37 with edges

  dishes, also known as a reinforcing plate.

  The reinforcing element 37 is formed separately from the

  tercalar 33 and is incorporated into it in a way

  which will be described later in detail.

  In the embodiment shown, the first 13 consists of a soft, flexible, flat cushioning pad 38 in contact with the user's sock. The pad 38 rests on the fabric bottom 15 of the upper 10 and can be formed of a suitable flexible material such as foam or crimped velvet The first 13 is characterized in that it

does not have a first plate.

  As shown in FIGS. 1 to 5, the reinforcing element 37 is placed in a slot 42 formed in the interlayer 33 between the upper and lower surfaces thereof to partially divide it into

  upper and lower layers 44 and 46 respectively.

  The reinforcing element 37 is suitably glued or otherwise fixed to the lower surface of the upper layer 44 of the interlayer and to the upper surface of the lower layer 46 thereof. Any suitable adhesive may be used. to fix the element of

  reinforcement 37 on layers 44 and 46 of the interlayer.

  Preferably, the adhesive is applied over the entire interface between the reinforcing element 37 and the upper layer

  44, as well as over the entire interface between the return element

  forcing 37 and the lower layer 46.

  The slot 42 extends parallel or at least in

  its assembly parallel to the outsole 32 when

  the sole of the shoe is in a straight position,

without bending.

  With the possible exception of the heel part ex-

  trême of the interlayer which can end in corner like

  shown in Fig 2, the lower layer 46 of the

  tercalar has an approximately uniform thickness over all

  the length and width of the slot 42 The posterior region

  upper layer 44 of the interlayer located

  under the user's rear foot or heel also

  roughly uniform thickness.

  The slot 42 is formed in the interlayer 33 at a

  level located at approximately equal distance between the edges

  lower and lower of the posterior region of the inter-

  level or slightly lower In all cases, the level of the slot 42 must be low enough to ensure that the upper layer 46 of the interlayer is thick enough to prevent the user's foot from coming into contact with the element reinforcement 37 on the occasion of a maximum foreseeable impact on it The thickness and

  other dimensions of the interlayer 33 can be conformed

  mes to the usual appropriate values currently in use

  used in the shoe industry to manufacture

running shoes.

  In a central part located under the region pos-

  it is at the bottom of the foot Qu tal Qn of the users the thickness

  total of tab 33 can for example be

  about 19 mm and the height of the slot 42 above the edge

  lower of the interlayer can be about 8 nm.

  As shown in Figs 1 to 3, the configuration or shape of the slot 42 follows that of the element

  reinforcement 37 to receive comfortably and

  the reinforcement plate fully The slot 42 extends

  over the entire posterior region of the foot or heel of the

  tercalar 33 in such a way that it opens fully-

  ment around the posterior region of the foot of the inter-

  calaire, at the back as well as on both sides From the posterior region of the interlayer 33, the slit 42 extends forward along, and opens at, the interior or median limit of the shoe roughly up to the head of the first metatarsus to be under the volte

inside of the user.

  It will be noted that the reinforcing element 37 can be assembled in any suitable manner with the interlayer 33. For example, after having made the slot 42 in the interlayer and coated with glue the two faces of

  the reinforcing element 37, it is possible to introduce completely

  the reinforcing element in the slot 42 The

  layers 44 and 46 of the interlayer and the reinforcing element

  cement can then be compressed together to firmly adhere the reinforcement element to the layers 44

and 46.

  The reinforcing element 37 consists of no

  what material is appropriate, durable and almost inextensible For example, it may consist of a

  sheet of rigid composite material based on poly resin

  ester and glass fibers woven or cut therefrom

  the proportion of glass fibers present is equal to

  about 25 percent by volume of the leaf.

  The minimum bending coefficient of

  the reinforcing element necessary for a good re-

  partition of the forces acting on the interlayer 33

  depends on the thickness of the reinforcement plate For the reinforcement element 37, the thickness should normally be at least close to 1.25 mm and preferably

  close to 1.5 mm, the coefficient of bending or bending

  trage must be at least 70 300 Kg / cm 2, preferably about 140 000 Kg / cm 'As shown in Fig 3, the element

  reinforcement 37 extends over the entire posterior region

  from the bottom of the sole of the shoe to the edge

  outside of the heel and from one side of the interlayer to the other.

  From the rear of tab 33, the return element

  forcing 37 extends forward along the interior or median limit of the shoe towards point 50

  very close to the head of the first metatarsus of the user

  tor From this point, the edge or the periphery of the reinforcing element 37 curves backwards and laterally along a line 51 adjacent to the heads of the second and

  user's third metatarsal The edge of the element

  reinforcement then curves to follow a

  direct line 52 extending longitudinally towards the rear

  to a region under the utility cubolde

  or it bends outward at 53 to extend laterally to the lateral or outer edge of the sole of the shoe along a line 54 to

  roughly perpendicular to the longitudinal axis of the shoe

  sour at the anterior end of the posterior region

or heel 39 of the interlayer.

  Due to the construction described, it is clear that the reinforcing element 37 is located under the entire rear region of the user's foot and extends forward to be located under the arch.

  the user's inner plantar along the

  te median, but one under the outer arch of the user-

* tor or anterior region of the foot which extends in front of the user's first, second and third metatarsal heads Due to the choice of surface covered by the reinforcing element 37, the plate does not interfere with the necessary flexion running shoe It can therefore be as rigid as desired without the

make it fragile.

  The reinforcing element 37 is preferably bevelled or thinned along its anterior curved edge (see lines 51 to 54) as shown at 56 in Fig 3 to avoid the user from perceiving or feeling an abrupt change in rigidity due to the ledge of

  the reinforcing element as it presses on the sole

  In addition, the rear or lateral rear angle 58 (fig, 3) can likewise be bevelled to avoid the development of stress concentrations in the part where the heel attacks most commonly, as well as to eliminate or reduce heavily accelerated wear

  harmful of the sole resulting from the presence of the element

reinforcement ment 37.

  The lower layer 46 of the interlayer serves

  only shock absorber to absorb the ef-

  strong resulting from the impact of the runner's foot on the ground.

  The upper layer 44 of the interlayer also serves

  shock absorber to absorb these forces and pro-

  also holds the foot of the user who therefore does not feel the hardness of the shoe due to the presence of the reinforcing element 37 In addition, the thickness of the upper layer 44 in the posterior region of the foot

  or user's heel is enough to marry close

  or mold to the shape of the user's heel

  in order to improve the comfort of it.

  By making tab 33 rigid in the ma-

  niere described above, the degree of penetration of the runner's foot in the upper layer 44 located above the element 37 is advantageously and markedly reduced compared to a conventional shoe not comprising the reinforcement element according to the invention The strengthening effect which manifests itself at the start of the deformation or penetration of the user's foot into the

  top layer 44 is roughly doubled by the pre-

  element 37 in tab 33, and it

  note that energy is absorbed about twice as much

  than with a classic shoe Although the maximum effort

  poorly increased compared to a new classic shoe, it nevertheless remains sufficiently low In addition, we know that classic shoes frequently lose about half of their energy absorbing properties in continuous use, for example sure

the distance of a marathon.

  The decrease in the degree of penetration of the posterior region into the interlayer 33 has the

  to allow the runner to control more the movement of the posterior region of his foot improving

  thus the stability of this region without im-

  strong in terms of absorption properties

interlayer shocks.

  By extending the reinforcing element 37 to a point where it is located under the arch of the foot

  inner or middle of the runner, the association of the

  tercalar 33 and the reinforcing element 37 under the inner arch creates for the user a comfortable arch support which is dynamic in that it is not

  felt only if significant forces are applied.

  This eliminates the need for arch fittings or other conventional arch support inserts placed

  throughout the shoe and which reduce unfavorable-

  bleine the useful volume to accommodate the foot in the gear

of the shoe.

  Element 37 serves to reduce deterioration of the interlayer in two ways. First, it is rigid enough to disperse or spread effectively.

  the forces acting on the interlayer 33 over the entire sur-

  face or region of the reinforcing member, thereby ensuring a more even distribution of forces affecting

  tab 33 in the area of the reinforcement element

  Thus, this element strongly eliminates or reduces the large marks of concentrated effort resulting from the style.

  particular race of a runner and, therefore,

  due to the irregular deterioration of the interlayer.

  Second, the reinforcing member 37 has

  the effect of limiting the lateral extension towards the exterior

  laughter of the interlayer 33 under the influence of the compression forces due to its adhesion to the layers 44 and 46 of the interlayer and due to its properties of quasi-inextensibility The tensile properties of the

  foam cell walls of the interlayer

  g Ules with adhesive surfaces J Ves are therefore used to

  miter-outward expansion due to the forces of

  compression Although some dilation of the inter-

  outward calaire occurs due to these forces

  compression, the extent of outward expansion

  laughing in each of layers 44 to 46 is nevertheless good

  less than the expansion that would occur without the element

  reinforcement ment according to the invention Deterioration

  of the insert resulting from this extension to the former

  The interior is therefore also reduced thanks to the present in-

vention.

  It should be noted that with the construction

  tion described above, the reinforcing element 37 has the effect of significantly improving the stability of a shoe

  racing car in which no deterioration of the

  tercalar only occurred in this regard element 37 a

  3 has the effect of dispersing off-center or imbalanced forces

  liberties produced by a particular racing style This dispersion produces a force of recovery which opposes

  when the foot arrives on the ground in an imbalanced position

  bre or overhang when, for example, the runner touches the ground along the outer or lateral edge of the

  shoe instead of placing the foot flat In addition, the ele

  reinforcement 37 provides better support for the foot

  during the race using layer 44 of the interca-

  as a cushion that fits comfortably into the shape

  of the user's heel during the race and in general

  additionally killing a dynamic support of the plantar arch for the inner or middle part of the arch of the foot

  of the runner In addition to the above, the element of

  forcing 37 greatly reduces irregular deterioration of the interlayer to significantly improve stability

  long-term running shoe and extend for-

  the duration of trouble-free use of the shoe

  safe. Because the expansion towards the outside of the interlayer is limited only by the properties of non-extensibility or tensile strength of 1 '

  element 37 and by the adhesion of this element on

  ches 44 and 46 of the interlayer, this expansion can be reduced by means of a flexible layer or element, almost inextensible in place of the reinforcing element 37 and by adhering this element or flexible layer not

  extendable to layers 44 and 46 of the interlayer.

  Instead of being molded in one piece and then slotted to receive the element 37, the interlayer 33 can be produced in two layers of foam formed separately, these

  layers which may have different specific masses.

  Due to the reinforcing element according to the invention

  different foam materials that we never thought of

  before suitable for dividers can be used

  used for the manufacture of running shoes.

  The element 37 need not be horizontal as shown in FIGS. 1 to 5. It can on the contrary be inclined or turned in one direction or the other about a longitudinal axis as shown in FIGS. 6 and 7 In FIG. 6, the element 37 is inclined in

  the desired direction that its lateral edge on the lower limit

  lateral or external re of the shoe is located at a

  level higher than that of its edge on the lower limit

  middle or inside of the shoe for

  think of the forces produced by the runners turning their feet inside excessively In Fig 7,

  element 37 is tilted the other way, in such a way

  re that the edge of the reinforcement element on the limit

  lower middle or inner of the shoe either if-

  killed at a level higher than the opposite edge of the ele

  reinforcement on the lower lateral or external limit of the shoe to compensate for the forces

  induced by runners turning their feet too far outside

laughing.

  The reinforcing element according to the invention is not necessarily flat or flat as in the case of the reinforcing element 37 This element can therefore be replaced by elements of different shapes For example, the reinforcing element can have a shape

  curved or curvy, and it can also be molded In or-

  tre, depending on the conditions, you can modify

  different factors relating to the reinforcing element

  cement according to the invention For example, factors such as its thickness, its rigidity, the geometric extent or

  the area covered by this element and the height at

  which it is set up can all be changed

  to adapt to different racing styles, to the dissy-

  leg and foot measurements and body weights.

  It will also be noted that the reinforcing element avoids difficult and costly attempts to modify the type of support of the running shoe by introducing different elastomeric materials into the foam of the interlayer.

  In addition, the strengthening element of the inter-

  calaire according to the invention can advantageously be manufactured

  as separate from the running shoe as an arti-

  common key for the use of pediatricians and orthopedists to modify existing or finished shoes, after their manufacture, to compensate for asymmetries of the legs

  or feet or other problems and therefore for person-

  to tailor the shoe according to the individual For example, the ele

  reinforcement ment according to the invention can be used to

  think of different leg lengths with the additional advantage of not requiring the installation of parts in the upper itself of the shoe The process

  of use of the reinforcing element in this way

  re includes the following operations;

  first of all, we split the foam midsole of a shoe

  sure of existing athletics or we otherwise form a cavi-

  tee in this insert to accommodate the return element

  forcing, then we introduce the reinforcement element specially made in the slot or cavity and we stick

this item on the tab.

  It will be noted that the elements of the athletic shoe die the race corresponding to the right foot

  are the reflected image of the elements of the shoe an-

  previously described for the left foot.

Claims (10)

CLAIMS -   1 athletic shoe for running and other sports including running, including   an upper (10) and a sole assembly (12), the upper   being located above and being fixed to a part of said sole assembly, this assembly comprising a flexible outsole <32) and a flexible midsole (33)   shock absorbing located above and attached to the seat   wear melle (32), said spacer (33) being formed   of a polymer foam characterized in that it comprises   takes a shaped element (37) produced separately from the   tercalar (33) and engaged in contact therewith along   of a surface conveniently chosen under the foot of the utility   and located between upper (44) and lower (46) surfaces of said interlayer (33) to reinforce   this along said previously chosen surface.   2 Athletic shoe according to claim-   tion 1, characterized in that said element (37) is available   dies at least under the user's heel, but not   under the entire foot, to reinforce said inter-   calaire (33) at least in the region below the heel of the user.   3 Athletic shoe according to claim-   tion 2, characterized in that said reinforcing element (37)   cement extends forward from the region under the user's heel to a point below the user's mid arch to provide   dynamic support of the mid-arch of the user tor.   4 Athletic shoe according to claim-   tion 1, characterized in that said reinforcing element (37) covers only the part of the interlayer 033) situated behind a perimeter which extends inwards from the median limit of said following sole assembly (12) ui curved line (51) close to the heads of the first, second and   third metatarsal of the user, this line inflates   sliding backwards (52) to a part of the   tercalar (33) situated under the cubold of the user and bending along this part to join laterally the lateral limit (53, 54) of said assembly (12)   sole so that said interlayer is reinforced   forced by said element (37) all along the region   located behind said perimeter.   Athletic shoe according to the claim   tion 1, characterized in that said reinforcing element (37)   cement covers the entire part of said interlayer (33)   located under the user's heel and extends towards the a-   from the said part under the intermediate region of the   arch of the user, but not under the   lateral tie of this arch or under the region of the foot of the user located in front of the heads of his first, second and third metatarsals.   6 Athletic shoe according to claim-   tion 1, characterized in that the upper (10) is of the closed type, with a fabric bottom glued to the interlayer (33) a first (13) being disposed on the fabric bottom in   the upper (10) and formed only of one or more ma- soft, supple thirds.   7 Shoe: athletic according to one   conch cs previous claims characterized in   that said reinforcing element (37) is constituted by   a reinforcing layer disposed between the upper layers   upper (44) and lower (46) of the interlayer (33) and stuck on them.   8 Athletic shoe according to any one   that of claims 1 to 6 characterized in that it   comprises a first, said interlayer (33) being at least partially divided into upper (44) and lower (46) layers, said reinforcing element (37) consists of a reinforcing layer disposed between said layers, the upper layer (44) s 'extending, at least under the heel of the user to form a cushion under it and said first 13) being flexible enough to allow said upper layer 44) to compress under the load of the heel of the user to marry the shape of this heel when the user's foot hits the ground during the race.   9 Athletic shoe according to any one   claims 1 to 6, characterized in that said   reinforcing element (37 is constituted by a plate of one piece, roughly non-extensible, disposed between upper and lower layers (44, 46) of the interlayer 34, said plate being rigid enough to disperse the forces produced by the impact of the user's foot on the ground during the race and acting on said interlayer in the region of the plate to ensure a more even distribution   uniform of the forces acting on this region.   Athletic shoe according to any one   claims 1 to 6, characterized in that said   interlayer (33) is at least partially divided into upper (44) and lower (4 q) layers, said reinforcing element (37) consisting of a reinforcing plate disposed between said layers, and in contact with them, said plate being at least approximately parallel to the sole   wear (32) when the latter is in the straight state, not   craps, some forces produced by the shock of the foot of   the user on the ground during the race acting on the   tercalar (33) in the region of the plate, this plate being rigid enough to distribute the forces more uniformly throughout said region, and being almost inextensible and glued to said upper (44) and lower (46) layers to resist lateral expansion of the interlayer (331 under the effect of these forces.   11 Athletic shoe for running and other sports comprising running, comprising an upper (l O) and a sole assembly (L 121, the upper being arranged above and being fixed to part of said sole assembly, this assembly (12) comprising a flexible outsole 32 and a flexible <33) shock absorbing midsole situated above and fixed on the outsole (32), said midsole (33) being formed of a polymer foam, characterized in that it comprises a shaped element (37) manufactured separately from the interlayer (33) and engaged in contact with the latter along a previously selected surface located at the outside of the upper (l Ol to reduce the irregular deterioration of the interlayer (33) due to the stresses developed therein by the user during the race.   12 Method for modifying an athletic shoe   existing tism comprising a polymer foam interlayer, characterized in that said interlayer (33) is cut to provide a housing (42 for receiving a shaped element, situated between the upper and lower surfaces of the interlayer (33, introduces a rigid element (37) having a predetermined configuration into said housing to reinforce the interlayer along a previously surface   chosen, and said element is glued on said insert.