EP0827700A1 - Sportsshoe with a device for the immobilisation of the pivoting of the cuff - Google Patents

Abstract

The sports boot has a lower rigid body (2) surmounted by an ankle part (3) able to pivot from front to back (20) and back to front (21). The ankle has in its dorsal zone (5) a device (10) for immobilising it relative to the body base in one of its pivoting directions by a stop. The immobilising device has an operating part (11) having a rotating cam (30) which acts on a movable part which engages a stop zone (14). The immobilising device comprises a second movable part (12,13) which is activated by the cam and which engages a second stop zone (15) at the body base for a given angular position of the cam. This immobilises the ankle in one of the pivoting directions. The engagement of the first movable part with the first stop zone immobilises the ankle in its other pivoting direction.

Description

The present invention relates to a so-called "rigid shell" sports shoe having a base of shell surmounted by a rod capable of pivoting in both directions, antero-posterior and postero-anterior, and relates to an immobilization device with respect to the active shell base for both directions of pivoting of the rod by means of a rotary actuator situated on the latter, and relates in particular to an adjustable immobilization device intended to modify the capacity of bending of the upper in at least one direction, depending on the use of the shoe envisaged at a time.

Sports shoes of this type are known from European patent EP 521,282. document, the device for immobilizing the rod relative to the shell base is active for one at less of its pivoting directions via a stop zone obtained on the hull base. To this end, the device is provided with a rotary operating member provided with a rotary cam which acts on a movable element intended, for a given angular position of the cam, to cooperate with the zone abutment of the shell base, and for another given position of the cam, to disengage from said stop zone. As taught, when the movable member cooperates with the abutment area of the shell base, the upper of the shoe is systematically blocked towards the rear, i.e. constrained to take an inclination commonly called "advancing angle" and, simultaneously, prevented from pivoting forwards or free from a certain clearance before blocking, determined by construction and resulting from the adjustment between the part of the movable element which cooperates with the stop zone and this. Conversely, when the movable element does not cooperate with the stop zone, the rod is unlocked, so free to pivot as much forwards as backwards.

As is clear, the immobilization device described can therefore modify the ability to pivot the rod between a ski practice position, with or without forward bending ability according to the predetermined construction, and an on-rebound position where the rod is free to pivot. Such an immobilization device is satisfactory if the user sticks to the only flexural capacity. forward of the rod which is determined in advance. In fact, from the immobilization position of the rod in the anteroposterior direction, there is only one immobilization position in the direction postero-anterior determining a single bending capacity of said rod. However, according to the envisaged skiing, for example competition skiing or leisure-relaxation skiing, or according to the state of the snowpack, deep, heavy, icy snow, etc., that the skier needs to increase or remove this forward bending ability. The immobilization system taught then reveals itself unsuitable because nothing allows, after construction, to modify the adjustment made between the part of its mobile element and the abutment area of the shell base, and therefore the possibility of bending the rod especially forward.

An object of the present invention is to overcome this drawback of the sports shoes described above, and for this purpose proposes a device for immobilizing the upper of a sports shoe which either suitable for a given angular position of a rotary cam controlled by means of a rotary maneuver, to immobilize the upper of the shoe in the postero-anterior direction in order to skiing while simultaneously providing said rod with a certain bending capacity in the direction postero-anterior before blocking, and, for another given angular position of the cam, always guaranteeing the immobilization of the rod in the antero-anterior direction, by providing at the same time as the rod, another capacity for bending or even eliminating the latter. In fact, the invention provides, for a position of constant immobilization of the rod in the anteroposterior direction, two possible immobilization positions in the postero-anterior direction determining two different flexural capacities of said rod.

Another object of the invention is to allow the release of the rod in pivoting in the direction antero-posterior in view, for example, of facilitating walking or putting on and taking off, in bringing the rotary cam into at least one intermediate angular position situated between the positions previous angular immobilization of the rod, and this leaving the rod a certain capacity to flexion in the postero-anterior direction.

To achieve these goals, the rigid shell sports shoe has, as in the state of the technique constituted by document EP 521 282, a shell base surmounted by a rod capable of pivot in both directions, antero-posterior and postero-anterior, the rod being provided in its zone dorsal, of an immobilization device with respect to the active shell base for at least one of its pivoting direction, via a stop zone obtained on said shell base. The immobilizer is provided with an operating member provided with a rotary cam which acts on a movable element intended to cooperate, for a given angular position of the cam, with the area of hull base stop.

The sports shoe is characterized by the fact that the immobilization device comprises a second mobile element which is actuable by means of the rotary cam and which is intended for cooperate with a second stop zone obtained on the shell base for at least one position given angularity of the cam. The cooperation of this second mobile element with this second zone stop is intended to provide immobilization of the rod for one of its two directions of pivoting, while the cooperation of the first movable element with the first stop zone provides immobilization of the rod for the other of its two directions of pivoting.

The simultaneous implementation of the two movable elements with the two stop zones causes thus immobilizing the upper of the shoe in both directions of pivoting and implementing of a single mobile element with its stop zone only causes the immobilization of the rod in a pivoting direction. Conversely, the simultaneous disengagement, or retraction, of the two elements moving causes the rod to be released in both directions of pivoting, while the disengagement of one of the movable elements only causes the release of the rod in a direction of pivoting.

There are thus at least three possibilities for modifying the ability to pivot of its rod, which optimizes the role of the shoe, especially when it is subject to equipment or accessories necessary for sports such as skis, skates, crampons, etc., modifying the traditional gestures of walking or running.

According to one characteristic, the rotary cam of the immobilization device is constituted by a plate which, centered on the operating member, comprises at least one circular probing surface having a high working area and a low working area, and the two movable elements of the device cooperate with this feeler surface by means of a feeler member of which they are provided respectively.

According to another characteristic, the feelers of the mobile elements come into contact of the probing surface of the cam at a distance from each other, each on one of the working zones high and low, at opposite points relative to the axis of rotation of the operating member.

According to one embodiment of the immobilization device, the plate constituting the rotary cam has two probing surfaces, one on each side, parallel to each other, and having, each, a high work area and a low work area, each moving element coming cooperate with one of the two probing surfaces by means of its probing member.

According to another embodiment of the immobilization device, the plate constituting the cam rotary has a single probing surface having, on 360 °, two bosses in the form of arcs of circle of the same height and different lengths defining between them two slots which their are symmetrically opposite with respect to the axis of rotation of the cam and therefore of the maneuver, the bosses constituting the upper work area and the slots the work area low.

According to a preferred characteristic of the invention, the two abutment zones of the shell base are obtained and located in the heel part thereof, each stop zone being intended to ensure, in cooperation with one of the two movable elements of the immobilizer and for at least one given angular position of the rotary cam, immobilization of the rod in one of its directions pivoting.

According to one embodiment, the two abutment zones of the shell base are formed, one by a vertical notch open upwards and delimited by flexible edges for its porto-anterior immobilization, and the other by its shoulder for its antero-posterior immobilization.

In this embodiment, the abutment zone formed by the notch is located above that formed by the shoulder. It is covered by the dorsal area of the stem and is intended for cooperate with one of the movable elements which can, as desired, under the action of the rotary cam and for determined angular positions thereof, to retract from said notch or to be inserted between its flexible edges thereby providing a certain possibility of postero-anterior pivoting of the rod or its immobilization in this direction. When the mobile element of the device is retracted from the notch, the flexible edges of the latter can be bring them closer to each other by elastic deformation under the pushing effect of the dorsal area of the rod which covers it and which describes an engaging trajectory on the heel part of the hull base to the place of said notch. It is understood that this possibility of pivoting is only permitted when the bending force applied to the rod is greater than that, resistant, opposed to it by the edges flexible notches. In the other position of the movable element, that is to say when the latter cooperates with the notch by being inserted between its flexible edges under the action of the rotary cam, for another given angular position thereof, the flexible edges are prevented from any reciprocal rapprochement since they run into the mobile element; as a result, the edges flexible notches oppose the thrust of the dorsal area of the rod which can no longer describe its engaging trajectory on them. The notch thus constitutes the abutment zone of the shell base capable of immobilizing the rod in the postero-anterior direction, and, depending on the angular position given to the rotary cam by means of the operating member, the abutment zone also capable of authorizing some possibility of bending of the rod in the postero-anterior direction.

Relative to the notch, the shoulder constituting the second stop zone is located below and transversely to the latter, also on the heel part of the shell base, and it is the second movable element of the immobilization device, that is to say the one not associated functionally with the notch, which is intended to cooperate with. According to a preferred structure, this movable element bears on the shoulder under the action of the rotary cam, for a position angular given thereof, and in particular when the rod is urged to bend in the antero-posterior direction.

• les figures 1, 2 et 3 illustrent trois positions de réglage d'une dispositif d'immobilisation selon l'invention et son action sur les possibilités de pivotement de la tige de la chaussure dans les sens antéro-postérieur et postéro-antérieur,
• la figure 4 montre, schématiquement, un détail de réalisation des deux zones de butée réalisées dans la partie talon de la base de coque de la chaussure des figure 1 à 3,
• les figures 5, 6 et 7 représentent la chaussure de la figure 1 vue en coupe partielle suivant la ligne V-V, et montrent, respectivement, selon un premier mode de réalisation de l'invention, un dispositif d'immobilisation dans chacune de ses trois positions de réglage des figures 1, 2 et 3,
• la figure 5a montre un détail de réalisation de la came rotative du dispositif d'immobilisation de la figure 5,
• les figures 8, 9 et 10 illustrent un autre dispositif d'immobilisation de la tige de la chaussure de la figure 1 vue en coupe partielle suivant la ligne V-V selon un deuxième mode de réalisation de l'invention, dans trois positions de réglage correspondantes à celles des figures 1, 2 et 3,
• la figure 11 représente, vue en perspective, l'extrémité ou plateau de la came rotative du dispositif d'immobilisation de la figure 8 mettant en évidence sa zone de palpage,
• les figures 8a, 9a et 10a illustrent, vue en plan, la position de la zone de palpage de la came rotative pour chacune des trois positions de réglage du dispositif d'immobilisation des figures 8, 9 et 10.

The invention will moreover be better understood, as well as certain characteristics, by referring to the following description with reference to the appended schematic drawings showing, by way of examples, two typical embodiments and according to which:

• FIGS. 1, 2 and 3 illustrate three adjustment positions of an immobilization device according to the invention and its action on the possibilities of pivoting of the upper of the shoe in the antero-posterior and postero-anterior directions,
• FIG. 4 schematically shows a detail of the two abutment zones produced in the heel part of the shell base of the shoe of FIGS. 1 to 3,
• Figures 5, 6 and 7 show the shoe of Figure 1 viewed in partial section along the line VV, and show, respectively, according to a first embodiment of the invention, an immobilization device in each of its three positions for adjusting Figures 1, 2 and 3,
• FIG. 5a shows a detail of the embodiment of the rotary cam of the immobilization device of FIG. 5,
• Figures 8, 9 and 10 illustrate another device for immobilizing the upper of the shoe of Figure 1 viewed in partial section along the line VV according to a second embodiment of the invention, in three adjustment positions corresponding to those of FIGS. 1, 2 and 3,
• FIG. 11 shows, in perspective view, the end or plate of the rotary cam of the immobilization device of FIG. 8 showing its probing zone,
• FIGS. 8a, 9a and 10a illustrate, in plan view, the position of the probing zone of the rotary cam for each of the three adjustment positions of the immobilization device of FIGS. 8, 9 and 10.

By way of illustrative, nonlimiting example, the shoe 1 designated overall, and shown in Figures 1 to 3 is of the "front entry" type.

This shoe 1 consists of a so-called rigid shell having a shell base 2 provided a sole 6, and surmounted by a rod 3 capable of pivoting thereon in the anteroposterior direction indicated by arrow 20, and postero-anterior indicated by arrow 21, by rotation around lateral connections 4, 4 ', preferably located in correspondence with the articulation of the wearer's ankle, not represented. An immobilizer 10 located on the dorsal area 5 of the rod 3 is provided with a rotary actuator 11, accessible from the outside of the boot shell, to which two movable elements 12, 13, are subject to displacement by means of a rotary cam (not represented) with which it is provided.

Two abutment zones 14 and 15 are obtained in the heel part 16 of the shell base 2 in correspondence of the movable elements 12, 13, of the immobilization device 10. In this way, these elements 12, 13, can come to cooperate, after a displacement generated by the rotary cam, with the abutment zones 14 and 15 for at least one given angular position of the rotary cam, i.e. the operating member 11 which is provided with it. These abutment zones 14 and 15 are oriented so as to oppose the pivoting of the rod 3 in the antero-posterior 20 and / or postero-anterior direction 21, when the element 12 and / or 13 cooperates with. In fact, when the two elements 12 and 13 are put in works on the abutment zones 14 and 15, the upper 3 of the shoe is immobilized in both directions of pivot 20 and 21 as shown in Figure 1. We then have a "stiff" shoe because its rod 3 has practically no degree of freedom in pivoting. It follows from this immobilization that the efforts and solicitations, intervening between the wearer's leg and the sole 6 of the shoe and / or the sports equipment or accessory subject to shoe 1, are transmitted almost instantaneously from the upper 3 to sole 4 and vice versa. Such behavior of shoe 1 is particularly advantageous when the wearer has to be reactive, for example when practicing competition, because the stiffness thus imparted to the rod 3 allows it to feel the slightest variations in his support and therefore react accordingly.

In another position, shown in Figure 2, only the movable member 13 cooperates with the area of stop 15. The rod 3 then remains immobilized in the anteroposterior direction 20 but is capable of some bending in the postero-anterior direction before blocking by pressing its anterior border 3 ' on the shell base 2 in the area corresponding to the instep. In this case we have a "stiff" shoe in the antero-posterior direction 20 and relatively flexible in the postero-anterior direction 21, which is often sought during sports practices requiring less responsiveness of on the part of the wearer or when the latter wishes to have a certain degree of freedom of flexion in the postero-anterior direction 21.

Again, as illustrated in Figure 3, when the two movable elements 12 and 13 are retracted abutment zones 14 and 15, the rod 3 is then free to pivot with a certain amplitude, in the two posterior-anterior 21 and antero-posterior directions 20, around its connections 4, 4 ', with respect to the shell base 2. In this case of adjustment of the immobilization device 10, the shoe 1 is with a great flexibility of upper 3 which is favorable for facilitating walking and / or putting on and taking off for example.

According to a preferred construction method illustrated in FIG. 4, the abutment zone 14, covered by the dorsal zone 5 of the rod 3 (not illustrated), is constituted by a vertical notch obtained in the heel part 16 of the shell base 2. This vertical notch 14, open upwards, is delimited by flexible edges 14 '. These are intended to reciprocally approach each other by elastic deformation, as indicated by the arrows 22, under the pushing effect of the dorsal zone 5 of the rod 3, when the said rod 3 pivots in the postero-anterior direction 21 around its connections 4, 4 ′, and when the movable element 12 is not inserted between them; it is understood that the force applied to the rod 3 must be greater than the resistant one opposed by the flexible edges 14 'to obtain a some bending. Lateral cutouts 17, 17 ′ can optionally be made in the base of shell 2, relatively in front of the heel part 16 thereof, in order to reduce the resistance to bending of the edges 14 ′ of the notch and therefore giving the upper 3 of the shoe a certain flexibility in the anteroposterior direction which is possible under low effort. It's obvious that the extent and shape of such lateral cutouts 17, 17 ', are provided by construction, during the definition of the structure of the hull base 2, as a function of the initial damping desired at rod level 3.

In the position of engagement of the movable element 12 between the flexible edges 14 'of the notch 14 under the action of the rotary cam (not shown) of the immobilizer 10, the thrust exerted by the dorsal zone 5 of the rod 3 can no longer generate the approximation of the edges 14 ', and this is therefore the heel part 16 of the shell base 2 which generally opposes the bending of the rod 3 in the posterior-anterior direction 21. In fact, in this position of the movable element 12, one obtains almost a blocking of the rod 3, ie its immobilization towards the front.

Relative to the notch 14, the second stop zone 15 is located below and is presented in the form of a transverse shoulder approximately perpendicular to the notch 14. The second movable element 13 of the immobilizing device 10 is intended to cooperate with this shoulder 15 by bearing on it under the action of the rotary cam (not shown) of the immobilizer 10 only when the rod 3 is urged to pivot in the antero-posterior direction 20.

Therefore, whatever the position of the movable element 13, that is to say in the cooperation position with the stop zone 14 or in the retracted position, the possibilities of bending the rod 3 in the direction postero-anterior 21 remain essentially determined by the position given to the movable element 12.

Figures 5, 6 and 7 which follow show an embodiment of the immobilization device 10 of shoe 1 in the three previously described adjustment positions, respectively: FIG. 5 = figure 1, figure 6 = figure 2, figure 7 = figure 3. In this construction of the device 10, the cam rotary 30 consists of a plate comprising, on each face, a probing surface 31, 32, as shown in Figure 5a. These probing surfaces 31 and 32 are mutually parallel and each have a 360 ° upper work area 33 and a lower work area 34. so, the upper 33 and lower 34 work zones are located, angularly with respect to the axis of rotation 30 '(Figure 5a) of the rotary cam 30, in the same place. Furthermore, the passage from a high work area 33 to a low work area 34 is achieved by means of a ramp progressive and angularly extends over approximately 90 °. To cooperate with each probing surface 31 and 32, the movable elements 12, 13, are each provided with a feeler 12 ', 13', and are subjected to the action of a spring 18 ensuring their permanent maintenance in contact with said surfaces 31 and 32. In this example of construction, the mobile element 12 is pivotally mounted on an axis 19 passing through a part of the dorsal zone 5 of the rod 3 near the abutment zone 15, and the element mobile 12 is slidably mounted in a guide 22 obtained in said zone 5 in correspondence with the abutment zone 14 of the shell base 2. This mounting opposite the abutment zones 14 and 15 means that the movable elements 12 and 13 with their probing members 12 ', 13', are placed angularly 180 ° from each other with respect to the axis of rotation 30 'of the cam 30. Consequently, from from a given angular position, each 90 ° rotation of the cam 30 by means of the operation 11 causes the displacement of at least one of the movable elements 12 and 13 relative to a stop zone 14 or 15, and intrinsically modifies the immobilization and / or pivoting conditions of the rod 3 relative to the shell base 2.

For example, as illustrated in FIG. 5, the two mobile elements 12 and 13 are used on the stop zones 14 and 15 by means of the rotary cam 30 which is placed in a position angular given allowing them to cooperate with said zones 14 and 15. More specifically, the member probing 12 ′ of the movable element 12 is in contact with the upper working area 33 of the surface of probing 32 of the cam 30 and the probing member 13 'of the movable element 13 is in contact with the area working position 34 of the probing surface 31 of the cam 30. In this position for adjusting the immobilization device 10, the rod 3 is therefore immobilized in pivoting around its connections 4, 4 ', relative to the shell base 2, whether in the antero-posterior 20 or postero-anterior direction 21.

From this angular position given to the cam 30, a 90 ° rotation of the operation 11 of the immobilizing device 10, and therefore of the cam 30, as shown in the Figure 6, only causes the removal of the movable member 12 relative to its abutment zone 14 or the notch. Indeed, the cam 30 then has, facing the feeler 12 'of the element 12, its lower working area 34 which, relative to the abutment area 14 of the shell base 2, is more distant than its upper working area 33. On the other hand, facing the feeler 13 'of the element 13, it is always its low working area 34 which is in contact. In this position of adjustment of the immobilization device 10, the upper 3 of the shoe is therefore always prevented from pivot in the antero-posterior direction 20 but able to flex in the antero-posterior direction 21 when an effort applied to it in this direction is sufficient to overcome resistance to deformation opposed to it by the flexible edges 14 ′ of the notch 14.

Again, Figure 7, by a further 90 ° rotation of the cam 30 from its previous position illustrated in Figure 6, and respecting the same direction of operation, the movable member 13 retracts to its turn from its stop zone 15. In fact, in this angular position of the cam 30, it is with the upper work area 33 of the feeler surface 32 which the feeler member 13 'cooperates element 13. This upper working zone 33 being closer than that low 34 relative to the abutment zone 15, it forces the movable element 13 to tilt accordingly, on its axis 19 by its probing member 13 'interposed, and thus to be retracted as said abutment zone 15. In this other adjustment position of the immobilization device 10, the upper 3 of the shoe is then free to pivot in both directions, anteroposterior 20 and posterior anterior 21, it being understood that for bend in the direction 21 the force applied to it must be at least greater than that, resistant, than it oppose the flexible edges 14 ′ of the notch 40 on which the dorsal zone 5 of said lean rod 3.

According to another embodiment of the immobilization device 10, shown in Figures 8 to 11 which follow, the plate 40 constituting the rotary cam comprises a single probing surface 41 circular having, on 360 °, two bosses 42 and 43, and the two movable elements 12, 13, are each rocker mounted on an axis 19. These bosses 42 and 43 in the form of arcs of a circle are provided. of the same height and different lengths, and define between them slots 44 and 45 which are symmetrically opposite with respect to the axis of rotation 40 ′ of the cam 40. In this case of construction, the bosses 42 and 43 constitute the upper work area, and the slots 44 and 45 the low work area. The bosses 42, 43, and the slots 44, 45 are also spaced apart. angularly from each other so that they can act, for a given angular position of the cam 40 by means of the operating member 11, on the probing members 12 'and 13' of the two movable elements 12 and 13, either two by two 42 and 43 or 44 and 45, or a boss 42 or 43 with a slot 44 or 45.

By way of example, FIGS. 8 and 8a show the immobilization device 10 in a position adjustment where the rotary cam 40 has the two slots 44 and 45, which constitute its area of low work, in cooperation with the feelers 12 ′, 13 ′, mobile elements 12 and 13. In FIGS. 10 and 10a, for another given angular position of the cam 40, these are the two bosses 42 and 43, which constitute the upper working area, which cooperate with the probing members 12 ', 13, mobile elements 12 and 13. Comparatively, Figures 9 and 9a show the cooperation a boss 43 and a slot 45 with the feelers 12 'and 13' of the movable elements 12 and 13 for yet another given angular position of the cam 40.

As shown, Figures 8, 9 and 10 illustrate the immobilizer 10 in the adjustment positions which correspond to those described respectively with reference to Figures 1, 2 and 3 above. Thus, in FIG. 8, the upper 3 of the shoe is immobilized in both directions of pivoting 20 and 21 relative to the shell base, in FIG. 9 in the anteroposterior direction 20 only with a release in the opposite direction 21, and in FIG. 10 with a release in its two directions of pivoting 20 and 21. However, other adjustment positions are possible. Indeed, the cam 40 can be brought into an angular position where the boss 43 cooperates with the probing 13 'of element 13, and the slot 45 with the probing member 12' of element 12. In this case, the rod 3 is released in pivoting in the anteroposterior direction 20, and remains prevented from pivoting in the postero-anterior direction 20.

It is understood that the means constituting the immobilization device 10 and / or the areas of stops 14 and 15 can be produced differently without departing from the scope of the invention.

Thus, the movable elements 12, 13, can either be provided rocked or sliding, and kept in contact with the feeler surface 31, 32, 41, of the rotary cam 30, 40, by means of a spring 18 or by any other equivalent element. Again, the stop zones 14 and 15 can easily be produced by the simple arrangement of a notch 14 which is used the bottom to constitute the abutment zone 15 as shown in FIGS. 8 to 10.

Claims (10)

Rigid shell sports shoe having a shell base (2) surmounted by a rod (3) able to pivot in both directions, antero-posterior (20) and postero-anterior (21), the rod (3) being provided, in its dorsal zone (5), with an immobilization device (10) relative to the hull base (2) active for at least one of its directions of pivoting (20, 21) via a stop zone obtained on said shell base (2), the immobilization device (10) being provided with a maneuver (11) provided with a rotary cam (30, 40) which acts on a mobile element intended to cooperate, for a given angular position of the cam, with the abutment zone of the shell base, characterized in that the immobilization device (10) comprises a second movable element (12, 13) which is actuable by means of the rotary cam (30, 40) and which is intended to cooperate with a second stop zone (14, 15) obtained on the shell base (2) for at least one position given angularity of the cam (30, 40), the cooperation of this second mobile element (12, 13) with this second stop zone (14, 15) being intended to provide immobilization of the rod (3) for one of its two pivoting directions (20, 21), the cooperation of the first movable element (12, 13) with the first stop zone (14, 15) providing immobilization of the rod for the other of its two directions of pivot (20, 21). Shoe according to claim 1, characterized in that the rotary cam (30, 40) is constituted by a plate which, centered (30 ', 40') on the operating member (11), comprises at least one circular probing surface (31, 32, 41) having a high working area (33, 42, 43) and a low working area (34, 44, 45) and by the fact that the two movable elements (12, 13) of the device immobilization (10) cooperate with this probing surface (31, 32, 41) by means of a probing member (12 ', 13') with which they are provided respectively. Shoe according to claim 2, characterized in that the feelers (12 ', 13') come into contact with the probing surface (31, 32, 41) of the cam (30, 40) at a distance one of the other each on one of the working areas (33, 34, 42, 43, 44, 45), that is to say high (33, 42, 43) and low (34, 44, 45), at opposite points relative to the axis (30 ', 40') of rotation of the cam (30, 40). Shoe according to claim 3, characterized in that the plate (30, 40) constituting the rotary cam (30) has two feeler surfaces (31, 32), that is to say one on each face, mutually parallel and each having a high work area (33) and a work area bottom (34), each movable element (12, 13) coming to cooperate with one of the two probing surfaces (31, 33) of the cam (30) via its feeler member (12 ', 13'). Shoe according to claim 3, characterized in that the plate (40) constituting the rotary cam (40) has a single probing surface (41) having, on 360 °, two bosses (42, 43) in the form of arcs of the same height and different lengths defining between them two slots (44, 45) which are symmetrically opposite them, the bosses (42, 43) constituting the upper work area (42, 43) and slots the lower work area (44, 45). Shoe according to any one of claims 1 to 5, characterized in that the two abutment zones (14, 15) obtained on the shell base (2) are located in the part of the heel (16) of this, and by the silence that each stop zone (14, 15) is intended to ensure respectively immobilization of the rod (3) only in one of its directions of pivoting, anteroposterior (20) and postero-anterior (21). Shoe according to claim 6, characterized in that the shell base (2) has in its heel part (16) a vertical notch (14) open upwards which is delimited by flexible edges (14 ') and which is covered by the dorsal zone (5) of the rod (3), this notch (14) allowing the rod (3) to pivot in the postero-anterior direction (21) thanks to the elastic deformation possible its edges (14 ') which can approach and by the fact that one (12) of the mobile elements (12, 13) of the immobilization device (10) is intended to cooperate with the notch (14) in fitting into it under the action of the rotary cam (30, 40), for a given angular position of the latter, in order to prevent the reciprocal approaching of the edges (14 ′) of the notch (14), which thus constitutes the abutment zone (14) providing immobilization of the rod in the postero-anterior direction (21). Shoe according to claim 7, characterized in that the shell base (2) has in the part of the heel (16) a shoulder (15), transverse to the vertical notch (14) and located below of the latter, with which the other movable element (13) of the immobilization device (10) is intended to come to cooperate by bearing on it under the action of the rotary cam (30, 40), for a given angular position of the latter, this shoulder (15) constituting the abutment zone (15) providing immobilization of the rod (3) in the anteroposterior direction (20). Shoe according to any one of claims 2 to 8, characterized in that one at less movable elements (12, 13) of the immobilizer is pivotally mounted around a axis (19) and subjected to the action of a spring (18) ensuring the permanent maintenance of its probing (12 ', 13') on the probing surface (31, 32, 41) of the rotary cam (30, 40). Shoe according to any one of claims 2 to 8, characterized in that one at less of the movable elements (12, 13) of the immobilization device (10) is movable in translation in a guide (22) and subjected to the action of a spring (18) ensuring the permanent maintenance of its feeler (12 ', 13') on the feeler surface (31, 32, 41) of the rotary cam (30, 40).

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