EP2688437B1 - Shoe having improved cushioning and propulsion - Google Patents

Description

FIELD OF APPLICATION OF THE INVENTION

The present invention relates to the field of shoes and in particular adaptations to optimize the phases of cushioning, support and propulsion stride.

DESCRIPTION OF THE PRIOR ART

A stride is likely to break down into three phases: reception, support and thrust.

• une phase de réception où le contact avec le sol et l'amorti sont réalisés aux environs de l'arrière du pied c'est à dire plutôt sur son talon pour une foulée normale (jogger, coureur de fond, marche), oubien plutôt sur l'avant pied pour une foulée de type sprint ou de demi fond,
• une phase d'appui où l'appui est réalisé avec le centre de gravité du corps aux alentours de la verticale du pied avec l'avant pied et le talon en contact avec le sol, et
• une phase de propulsion ou de poussée réalisée sur l'avant du pied avec le talon soulevé.

These three phases can be described as follows:

• a reception phase where contact with the ground and the cushioning are done around the back of the foot, that is to say rather on his heel for a normal stride (jogger, runner, walk), or rather on the forefoot for a stride of the sprint or half-way type,
• a support phase where the support is achieved with the center of gravity of the body around the vertical of the foot with the forefoot and the heel in contact with the ground, and
• a propulsion or pushing phase performed on the forefoot with the heel raised.

To accompany and assist in the realization of such a stride, the state of the art offers a plurality of shoes capable of achieving cushioning of the reception phase in the best conditions. These shoes use the same principle namely the compression of an elastic means during the reception phase.

More recently, shoe designers have been led to propose shoes that can improve the thrust phase by also using a resilient means to restore a portion of the energy stored during the push phase.

The Applicant has found several disadvantages to this type of shoes, some of which are described below.

When cushioning is preferred, the shoe provides shock absorption at the reception and does not provide support for propulsion.

When the shoe proposes to improve both cushioning and propulsion, it appears that the return of the resilient means succeeds almost simultaneously to the reception phase and therefore does not intervene in the thrust phase but in the support phase. The consequence is that if the propulsion is improved, the natural stride of the runner is greatly modified which makes the utility of such a shoe quite relative. It also appears in this type of configuration that the excessive use of elastic means moves the foot off the ground and causes constant instability.

Another disadvantage found is that the shoes adopting such improved features have their configuration dedicated and can not return to a configuration with conventional features allowing a stride and a conventional walk.

The document WO 2005/011419 describes a shoe sole for walking, running and jumping, ensuring the recovery of energy during the support phase and redistributing it during the pushing phases. However, this sole which, in one embodiment has the form of a parallelogram, merely manage the approximation and removal of the horizontal parts of the parallelogram by means of a spring working in tension. The articulation between the sole part linked to the forefoot and that linked to the back of the foot does not exist or is not controlled by said parallelogram.

In addition, such a document does not describe the possibility of a return to normal configuration allowing a stride or an arch without accompaniment or amortized.

• une première partie arrière liée à la zone arrière et médiane de la partie chaussante de la chaussure, et- une deuxième partie avant liée à la zone de l'avant-pied de la partie chaussante de la chaussure,ces deux parties de semelles étant articulées selon un premier axe transversal horizontal se situant sensiblement sous l'articulation naturelle entre l'avant-pied et la partie arrière du pied, telle que la deuxième partie avant solidaire de la partie chaussante de l'avant pied se prolonge vers l'arrière dudit premier axe d'articulation en une partie formant bras de levier et se projetant vers l'arrière dans le même plan que celui de la partie avant et solidaire cinématiquement de cette dernière, l'extrémité arrière de ce bras présente un deuxième axe d'articulation avec l'extrémité d'au moins un module élastique dont l'autre extrémité est articulée autour d'un troisième axe d'articulation solidaire de l'extrémité arrière de la partie arrière de la semelle.

US 2003/126761 A1 discloses a shoe comprising a footwear and a sole, the sole comprises two main parts hinged together:

• a first rear portion linked to the rear and middle zone of the footwear portion of the boot, and- a second front portion linked to the forefoot zone of the footwear portion of the boot, both of these sole portions being hinged along a first horizontal transverse axis lying substantially under the natural articulation between the forefoot and the rear part of the foot, such that the second front part integral with the footwear portion of the forefoot extends towards the rear of said foot; first axis of articulation in a portion forming a lever arm and projecting backwards in the same plane as that of the front portion and cinematically fixed to the latter, the rear end of this arm has a second axis of articulation with the end of at least one elastic module whose other end is hinged about a third axis of articulation secured to the rear end of the rear part of the seed Miss.

It appears in fact that if the state of the art describes a plurality of cushioning and / or accompanying solutions, the soles and shoes proposing these solutions are not able to allow a normal gait, which decreases the pressure. commercial scale of such shoes.

Indeed, in the current state of the art, more cushioning and support are effective minus the shoe obtained is likely to resemble or reproduce a normal aesthetic and gait.

DESCRIPTION OF THE INVENTION

Based on this fact, the Applicant has conducted research aimed at the design of a shoe obviating the aforementioned drawbacks by optimizing the phases of cushioning, support and thrust.

Another object of the invention is to provide a shoe respecting the natural stride.

Another object of the invention is to provide a shoe likely to return to a conventional configuration to practice including walking in normal and comfortable conditions.

• une première partie arrière liée à la zone arrière et médiane de la partie chaussante de la chaussure , et
• une deuxième partie avant liée à la zone de l'avant-pied de la partie chaussante de la chaussure.

This research led to the design of a shoe comprising a footwear and a sole, which sole comprises two main parts articulated between them:

• a first rear portion connected to the rear and middle zone of the foot part of the shoe, and
• a second front part connected to the forefoot zone of the footwear part of the shoe.

These two parts of soles are articulated along a first horizontal transverse axis lying substantially under the natural articulation between the forefoot and the rear part of the foot.

According to the invention, the second front part secured to the foot part of the forefoot is extends rearwardly of said first hinge axis in a lever arm portion and projects rearward in the same plane as that of the front portion and kinematically secured thereto. The first hinge axis is therefore located in a median position between the front end of the second front portion and the rear end of said lever arm. According to the invention, the extension of the front sole respects a proportion of length 2/3 (two-thirds) and 1/3 (one-third) on either side of the axis of articulation, ie 2 / 3 for the front part and 1/3 for the back part.

The rear end of this arm has a second axis of articulation with the end of at least one elastic module whose other end is articulated around a third axis of articulation secured to the rear end of the part. back of the sole so that when the triangle formed by the three hinge axes flattens, the three axes become substantially coplanar and the elastic module is compressed and jammed.

This damper has a variable length, variation accompanied by an elastic module which will allow the triangular triangle or prism formed by the three hinge pins to flatten to compress the damper and to remove it during the release of the last. This flattening creates a blockage of the system at the end of the race. Indeed, the elastic modulus working compression is blocked by the alignment effect of the three points of articulation, that is to say when the hinge axes become substantially coplanar.

• à transformer, lors de l'impact de la phase de réception, l'énergie cinétique en énergie potentielle en mettant le module élastique sous pression,
• à maintenir le module élastique coincé sous pression en phase d'appui, et
• à libérer le module élastique en phase de propulsion.

This characteristic will make it possible to follow the phases of the process consisting of:

• to transform, during the impact of the reception phase, the kinetic energy into potential energy in putting the elastic module under pressure,
• to maintain the elastic module stuck under pressure during the bearing phase, and
• to release the elastic module in the propulsion phase.

The delayed release of this elastic module makes it possible to restore the accumulated energy at the right moment, namely for the propulsion phase.

In addition, the storage of this potential energy will allow to release it at the right time and in the right place to know in part before the foot where is located the pulse for the propulsion phase.

• l'amorti est de grande qualité car il évite tout choc dans la jambe du à une restitution parasite de l'énergie,
• en phase d'appui, le pied reste très stable grâce à un contact franc et direct entre le pied et le sol, les effets du module élastique étant annulés par l'effet de coincement dû à l'alignement des trois points,
• la restitution en phase de propulsion va permettre l'augmentation des performances et donc une économie d'énergie,
• etc...

Delayed restitution of energy has several advantages and among these:

• the cushioning is of high quality because it avoids any shock in the leg due to a parasitic restitution of energy,
• in the support phase, the foot remains very stable thanks to a direct and direct contact between the foot and the ground, the effects of the elastic module being canceled by the wedging effect due to the alignment of the three points,
• the restitution phase propulsion will allow the increase of the performances and thus a saving of energy,
• etc ...

Another aspect studied by the Applicant relates to the duration during which the stored energy is restored. All energy is restored during the heel detachment phase by a rotational movement about the first axis of articulation (front hinge pin), the spring bearing on the ground and pushing on the back of the heel. The restitution is optimal.

According to a particularly advantageous characteristic, the release of said elastic module is carried out gradually to accompany the foot during most of the propulsion phase. This slower restitution than existing devices and processes, allows to better respect the ligamentous tissue and to assist the contraction and muscle relaxation of the propulsion phase.

Thus, the method implemented by the sole of the invention proposes a restitution of the elastic modulus over a longer duration than the duration of the storage phase.

According to a particularly advantageous characteristic, said shoe comprises two elastic modules arranged on either side of the foot in the concave volumes of the sole corresponding to the natural outer and inner cavities of the arch. Such an arrangement allows the three axes of articulation, as well as the damper and the two parts of the soleplate to align (to become coplanar) causing the neutralization of the damper. Such an external and visible disposition makes it possible to give the shoe an attractive aesthetic appearance by providing it with a high-tech design. The stability and the weight of the shoe are further improved because the moving parts can be brought together without the elastic modules being interposed between. Indeed, these dampers are integral with the outer edges of the moving parts allowing them to come into contact. In addition, the ease of access to dampers facilitates their adjustment and interchangeability. This easy setting will allow the management of the pronation by playing on different settings between the inner shock and the outer shock.

Of course, an embodiment of the shoe of the invention comprises a single elastic module or external damper. Indeed, the joints being constituted by pivotal links, the presence of a single damper allows the same movements.

The elastic module is arranged and articulated with respect to the two parts of sole assembly so that the direction of the tension forces of said elastic module is positioned substantially parallel to the ground when the two parts of the sole join. The maintenance under tension then operates according to a latch system where the elastic module is found in a position of mechanical dead center without the need for a stop when the shoe is at the end of the damping phase. According to a preferred embodiment, said elastic module operates in compression. This feature has the advantage of compressing the shortest elements and pulling the longer elements which avoids oversizing the different parts forming the sole. The sole of the invention substantially resumes the width of a conventional sole and also allows the reception of dampers in the two hollow formed by the arch on both sides of the foot and thus by the shoe.

Due to the arrangement of the hinge pins, the shoe offers for the same elastic module formed by the two dampers a different direction and stroke for powering up and for release. This different race will make it possible to implement the method of proposing a phase of restitution more progressive and slower than the storage phase corresponding to the respective different needs of the runner for the phases of reception and propulsion.

According to another particularly advantageous characteristic, the elastic module comprises at least one spring. According to a nonlimiting embodiment, said module is constituted by one or more springs associated with rods whose ends are hinged respectively to the movable front part of the sole and the rear part.

According to another particularly advantageous characteristic, the stiffness of the elastic modulus is defined so that the action of the weight of the user on the shoe makes it possible to reach the support position where the elastic modulus is inactive with respect to the shoe and wherein the lower surface of the rear portion of the soleplate engages the upper surface of the rear arm of the front portion of the soleplate. Thus, during the stride at each end of the reception phase and during the support phase, the shoe becomes a shoe with conventional mechanical characteristics. Thus, it should be understood that during the stride, the moving parts come into abutment and therefore support one on the other during the support phase preceding the propulsion phase unlike shoes with intercalated springs which do not stabilize a limit switch.

• poids du coureur et éventuels défaut de morphologie (supination et pronation),
• fréquence et amplitude de la foulée selon le coureur,
• état du sol (bitume, terre extérieure, etc...),
• dénivelés positifs ou négatifs.

Another object of the invention is to provide a shoe having correction means by adjustments or by the interchangeability of elements such as the elastic means, the position of the pivot links or joints, the surfaces in contact to adapt to the following parameters:

• rider's weight and any morphological defect (supination and pronation),
• frequency and amplitude of the stride according to the runner,
• soil condition (bitumen, exterior soil, etc.),
• positive or negative elevation differences.

To do this, the tension of said springs can be different from one damper to another. In addition, this voltage can advantageously be adjusted by the use of screw stiffeners, by the replacement of the springs or by the combination of several springs for the same elastic or damping module. According to a mode of preferred embodiment, each damper is independently adjustable for example over a range of one to ten kilograms. In addition, a set of several dampers makes different shock absorbers available for each ten kilograms. Thus, the cushioning and energy recovery capabilities of the shoe can be adapted to the weight of its user and its use that can define other parameters than the weight. According to another characteristic, the shoe is remarkable in that the elastic modules have different stiffness on either side of the foot.

According to another particularly advantageous feature of the invention, the shoe of the invention proposes a return to an unaccompanied and undamped gait or stride. To do this, said shoe comprises a locking means of the two parts of the sole between them in support phase where they are coplanar to prevent for example the effects of the elastic module during the other phases. Said locking means keeps the two parts of soles in contact in the position taken in the support phase.

This locking means completely cancels the effect of the elastic modulus and brings the shoe back to a conventional configuration making it possible to practice walking in normal conditions.

This locking means also makes it possible to maintain, if it is not released, a configuration classic to the shoe. Being accessible from the outside, this locking system allows the user implementation by remaining shod with the help of the ground, the hand, the other foot, etc. ....

The implementation of the locking or unlocking requires very little effort because it is performed when the two sole parts are in close position and where the elastic module has its effects canceled because of of his position. Thus, the working method consists in locking the boot in the support phase to adopt a conventional shoe operating method.

According to one embodiment, the boot comprises a means for locking the elastic module in the compressed position.

According to another solution envisaged, the movement of the two parts of sole assembly is accompanied by a ratchet type system that is released only once a certain angular amplitude reached between the forefoot and the back of the foot.

According to another particularly advantageous characteristic, the boot comprises a disengaging device which is placed on the user's command from a disengaged position where the elastic module (s) are inactive and free at an engaged position where the elastic module (s) accompany the movement of the sole parts. The locking means mentioned above will prevent the movement of the sole portions between them when the elastic modules are disengaged.

According to a preferred embodiment where the damper consists of a metal rod and a spring, the connection between the damper rod and the third hinge pin is controlled by a control button which passes from a engaged position to a disengaged position and vice versa. The engaged position holds the rod end in position relative to the hinge axis so as to allow the sole to transmit its movement to the damper for compression purposes and the damper to transmit its energy to the sole during its extension. The disengaged position allows the rod of the damper to slide perpendicularly relative to said third axis of articulation so that the movement of the movable parts of the sole only makes slide the damper rod perpendicular to the axis of articulation without these compress or stretch.

This solution has the advantage of not involving the dampers without blocking the joint between the two main parts of the sole.

According to another particularly advantageous feature of the invention, a movable midsole hinged relative to the front portion of the sole on the one hand, at a first end around said second hinge axis and on the other hand, around a fourth axis of articulation carried by the lower end of a connecting module whose upper end is hinged about the third axis of articulation, the fourth axis of articulation is disposed on said movable midsole so that the link module is parallel to the front portion of the sole so as to form a parallelogram configuration. The lower and upper surfaces of the soles then come into contact at the connection module when the elastic module is compressed or inactive.

Since the basic concepts of the invention have been set forth above in their most basic form, other details and features will emerge more clearly on reading the description which follows and with reference to the appended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

• The figure 1 is a schematic drawing of a side view of a first embodiment of a shoe equipped with a sole according to the invention during the reception phase;
• Figure la is a side view of the sole of the figure 1 alone;
• The figure 2 is a schematic drawing of the shoe of the figure 1 in the support phase;
• The figure 3 is a schematic drawing of the shoe of the figure 1 during the push phase;
• The figure 4 is a top view of the sole of the figure 1 alone;
• The figure 5 is a schematic drawing of a side view of a shoe equipped with a second embodiment of the sole according to the invention;
• The figure 6 is a schematic drawing of the shoe of the figure 5 in the support phase;
• The figure 7 is a schematic drawing of the sole of the figure 5 during the push phase;
• The figure 8 is a top view of the sole of the figure 5 alone;
• The figure 9 is a schematic drawing of a third embodiment of a sole equipped with a locking means in position;
• The figure 10 is a side view of the sole of the figure 9 in the unlocked low position;
• The figure 11 is a side view of the sole of the figure 9 in locked down position;
• The figure 12 is an exploded perspective view of the damper and the locking module;
• The figure 13 is a perspective view of a fourth embodiment;
• The figure 14 is a perspective view of an embodiment not forming part of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

• une première partie arrière 100 liée à la zone arrière et médiane de la partie chaussante de la chaussure C, et
• une deuxième partie avant 200 liée à la zone de l'avant-pied de la partie chaussante de la chaussure C.

As illustrated in the drawings of Figures 1 to 4 , the sole S is divided into two main parts articulated between them:

• a first rear portion 100 connected to the rear and middle zone of the footwear portion of the shoe C, and
• a second part before 200 linked to the forefoot zone of the footwear part of the shoe C.

These two parts of soles 100 and 200 are articulated along a first horizontal transverse axis A1 referenced substantially under the natural articulation between the forefoot and the back of the foot.

According to the invention, the second front portion 200 integral with the foot portion of the forefoot is extended towards the rear of the hinge pin A1 in a lever arm portion 210 and projecting towards the rear in the same plane as that of the front part. The hinge axis A1 is therefore located in a median position between the front end of the second front portion 200 and the rear end of said lever arm 210. As illustrated, this median position is about 2/3 and 1 / 3, ie 2/3 for the front part linked to the footwear part and 1/3 for the rear part linked to the fender. Thus part 210 corresponds to one third of the total length of part 200.

The rear end of this arm 210 has a second axis of articulation A2 with the end 310 of at least one damper 300 whose other end 320 is articulated around a third axis of articulation A3 integral with the part back 100 of the sole.

This damper 300 has a variable length, variation accompanied by an elastic member 400 which will allow the triangle formed by the three hinge axes A1, A2 and A3 to flatten to compress the damper and to remove it at the release of the latter. When this triangle is flattened, the three axes of joints become substantially coplanar allowing jamming of the shock absorber phase support. These phases are illustrated by the positions illustrated by the drawings of the Figures 1 to 3 .

In the contact position illustrated by the drawing of the figure 1 , shoe C comes into contact with the ground via the sole portion 210 at the second axis of articulation A2. The damper 300 thus damps the impact and compresses throughout the next phase.

Following the movement of the foot, this second axis A2 being fixed, the axes A3 and A1 will join substantially the same plane parallel to the ground support phase as illustrated by the drawing of the figure 2 , the damper being jammed. The damper is then in the retracted position where the compression ratio is the largest. The lower surface of the rear portion 100 of the sole then bears against the upper surface of the rear arm 210 of the front part of the sole.

For the propulsion phase illustrated by the drawing of the figure 3 , the rear portion 100 is raised relative to the front portion 200 remained on the ground around the first axis of rotation A1 which allows the damper to unjoin and relax thereby contributing to the thrust force by pushing against the ground in A2 and the heel at A3 during the propulsion phase.

As illustrated on the drawing of the figure 4 , this sole embodiment accommodates two dampers 300 disposed on either side of the rear portion of the sole 100 and positioned to occupy the concave volumes left free under and on either side of the conventional soles.
Thus, the sole of the invention has a standard sole width.

It should be emphasized that the damping devices are equipped with elastic modules constituted by compression coil springs. The original use of the compression rather than the traction avoids oversizing of the part constituting the sole avoiding an oversize damaging the proper use of the shoe.

This triangular configuration of the sole can evolve into a parallelogram configuration as illustrated by the drawings of the Figures 5 to 8 .

This configuration is more suitable for a stride or a step where the heel will come first in contact with the ground S as illustrated in the drawing of the figure 5 to dampen said contact by providing a movable midsole 500 articulated with respect to the front portion 200 of the sole on the one hand, at a first end 510 about said second axis of articulation A2 and on the other hand, around a fourth axis of articulation A4 carried by the lower end of a link module 600 whose upper end is articulated around the third axis of articulation A3. The hinge pin A4 is disposed on said movable midsole 500 so that the connecting module 600 is parallel to the front portion 200 of the sole so as to form a parallelogram configuration. Thus, the length of the soleplate 500 is equal to the length of the soleplate 100, the arms 600 have a length equal to the arm 210.

As illustrated on the drawing of the figure 6 , the support phase sees the abutment of the lower face of the rear portion 100 of the sole with the upper surface of the rear arm 210 and the intermediate sole 500. The various axes of articulation are then substantially coplanar.

The operating principle is equivalent to that of the triangle configuration with respect to compression, holding in a compressed position and expansion. Simply, it is no longer the front part 200 of the sole that comes into contact first and triggers the folding of the triangle but the rear part of the movable midsole 500 which causes the beginning of folding of the parallelogram.

The Figures 9 to 12 illustrate a particularly advantageous feature of the invention proposing to engage and disengage the elastic modules and therefore the dampers without blocking the joints.

Although this feature is illustrated on the based on a parallelogram configuration, the latter can also be applied to a triangle configuration since the locking and / or unlocking relates to the connection between the damper rod 300 'and the pivot point to which it is connected. .

As illustrated on the drawing of the figure 9 , the upper end of the damper rod 300 'is equipped with a head cooperating with a control button 700.
This control knob 700 passes by rotation of the disengaged position illustrated by the drawings of the figures 9 and 10 where the damper 300 'is deployed regardless of the phase in which the sole is located, the position of the axis A3 does not affect the compression of the spring 400, the engaged position illustrated by the drawing of the figure 11 where the head 310 'is articulated in a pivotal connection only to the axis A3 so that the relative translation movements of the axis A3 with respect to the axis A2 are carried on or accompanied by the damper 300'.

The control of said clutch is illustrated in more detail in the drawing of the figure 12 . As illustrated, the control knob 700 is equipped with a cylindrical projection forming crank pin 710 eccentric with respect to its axis of rotation.

This crank pin 710 cooperates for sliding or holding in position with a path 311 'formed in the head 310' of the damper 300. This path 311 'has a portion 312' parallel to the axis of the spring 400 and a portion 313 'perpendicular to the latter. The rotation of the knob 700 makes it possible to move the crankpin 710 to a disengaged position where the axis of rotation A3 and the axis of the crankpin 710 are in the portion 312 'parallel to an engaged position where the axis of rotation A3 and the axis of the crankpin 710 are in the perpendicular portion 313 'of the path 311' formed in the head 310 '.

In the embodiment illustrated in the drawing of the figure 13 , the rear arm 600 'is constituted by a triangle which is made of a deformable semi-rigid material allowing the two platforms 100 and 500 formed by the parallelogram not to remain parallel to the first contact with the ground to return parallel at the end of race when the two platforms 100 and 500 come into abutment which facilitates the natural pronation. According to another embodiment not illustrated, said arm is constituted by two independent arms.

The figure 14 illustrates an embodiment of the sole forming part of the invention in that the shoe comprises a lever arm 210 'also articulated to the front portion 200 coaxially with the axis of articulation of the rear part with the part A1 front sole bringing an additional hinge. Such articulation facilitates the implementation of the locking of the elastic module in the compressed position.

It is understood that the shoe, which has just been described above and shown, has been for a disclosure rather than a limitation. Of course, various arrangements, modifications and improvements may be made to the example above, without departing from the scope of the invention.

Thus, for example, the elastic module is of the gas spring type.

In addition, the material used for the sole elements and the arm are semi-rigid plastic type or composites. They are made of hard materials of the steel or ceramic type for the axes and other connecting pieces.

Claims (13)

1. Shoe (C) comprising a shoe portion and a sole (S), the sole comprises two main portions that are pivotably connected together:

   - a first rear portion (100) linked to the rear and median zone of the shoe portion of the shoe (C), and

   - a second front portion (200) linked to the zone of the forepart of the shoe portion of the shoe (C),
   with these two portions of soles (100 and 200) being pivotably connected according to a first horizontal cross pin (A1) located substantially under the natural joint between the forepart and the rear portion of the foot, such as the second front portion (200) secured to the shoe portion of the forepart extends to the rear of said first swivel pin (A1) in a portion forming a lever arm (210) in a proportion substantially equal to 2/3 and 1/3, i.e. 2/3 for the front portion linked to the shoe portion and 1/3 for the rear portion,
   and being projected to the rear in the same plane as that of the front portion (200) and kinetically secured to the latter, the rear end of this arm has a second swivel pin (A2) with the end (310) of at least one elastic module (300) of which the other end (320) is pivotably connected around a third swivel pin (A3) secured to the rear end of the rear portion (100) of the sole (S), in such a way that when the triangle formed by the three swivel pins (A1, A2, A3) is flattened, the three pins become substantially coplanar and the elastic module (300) is compressed and wedged.
2. Shoe (C) according to claim 1, characterized in that a mobile intermediary sole (500) pivotably connected in relation to the front portion of the sole on the one hand, to a first end around said second swivel pin (A2) and on the other hand, around a fourth swivel pin (A4) carried by the bottom end of a linking module (600) of which the top end is pivotably connected around the third swivel pin (A3), the fourth swivel pin (A4) is arranged on said mobile intermediary sole (500) in such a way that the linking module (600) is parallel to the front portion (200) of the sole (S) in such a way as to form a configuration as a parallelogram.
3. Shoe (C) according to claim 1, characterized in that it comprises two elastic modules (300) arranged on either side of the foot in the concave volumes of the sole (S) corresponding to the natural outside and inside cavities of the arch of the foot.
4. Shoe (C) according to claim 1, characterized in that said elastic module (300) operates in compression.
5. Shoe (C) according to claim 1, characterized in that the stiffness of the elastic module (300) is defined in such a way that the action of the weight of the user on the shoe (C) makes it possible to reach the support position wherein the elastic module (300) is inactive in relation to the shoe (C) wherein the lower surface of the rear portion (100) of the sole (S) comes into contact with the upper surface of the rear arm (210) of the front portion (200) of the sole (S).
6. Shoe (C) according to claim 1, characterized in that said elastic module (300) comprises at least one spring (400).
7. Shoe (C) according to claim 6, characterized in that the stiffness of said elastic module (300) is adjusted via the use of screw stiffeners or by the replacement of springs (400) for the same module.
8. Shoe (C) according to claim 3, characterized in that the elastic modules (300) have different degrees of stiffness on either side of the foot.
9. Shoe (C) according to claim 1, characterized in that it comprises a means for locking the two sole assembly portions together in a support phase wherein they are coplanar.
10. Shoe (C) according to claim 1, characterized in that it comprises a disengaged device (700) switching as controlled by the user, from a disengaged position wherein the elastic module or modules (300) are inactive and free to an engaged position wherein the elastic module or modules (300) accompany the movement of the portions of the sole (S).
11. Shoe (C) according to claim 2, characterized in that the lower and upper surfaces of the soles (100 and 500) come into contact on linking module (600) when the elastic module (300) is compressed or inactive.
12. Shoe (C) according to claim 1, characterized in that it comprises a lever arm (210') also pivotably connected to the front portion (200) coaxially to said first swivel pin (A1) of the rear portion (100) with the front portion (200) of sole (S).
13. Shoe (C) according to claim 12, characterized in that it comprises a means for locking the elastic module in compressed position.

Images