EP0820789A1 - Boot-ski combination - Google Patents

Abstract

The assembly is for a ski having a toe stop and heel fixing between the ski and the boot. It comprises a shell (6) and an upper collar (5). The collar is pivoted to the shell of the boot so it can be inclined forwards, especially when making turns. The ski boot collar also has a mechanism connecting it to the ski with the aim of modifying the ski's rigidity or camber when the collar is inclined. The mechanism comprises an arm (10) located at one side of the boot, passing through the axis of the pivot and connected to one end of a lever (12). The lever lies parallel to the upper surface of the ski with its rear end connected to the lower end of the arm (10) and its forward end interacting with a thrust plate (15) which is connected to the upper surface of the ski by a visco-elastic bloc (14).

Description

Technical area

The invention relates to the field of boots and alpine skis. It relates more particularly to a ski boot positioned in the bindings themselves screwed onto the ski. The shoe conforms to the invention has a direct action on the ski to modify its stiffness and / or the camber according to the different skier positions observed during the turn.

Previous techniques

The invention aimed at optimizing the behavior of the ski during the making the turn, you should first specify the different phases and position of the leg and the forces transmitted by the skier to the ski during the turn. Very schematically, we can break down a turn into three essential phases, namely triggering, driving and coming out of the bend.

During the initiation phase of the turn, the skier wears his body weight inward of the turn and forward. The leg is therefore bent and the upper part of the shoe which is articulated with respect to the shell forming lower part, is inclined forward. The weight of skier and the impulse it generates are rather localized towards the front of the sole. In this phase, the ski must bend to register its edge internal in a curve. To decrease the radius of curvature of this trajectory, the impulse of the skier, that is to say the force that he exerts on the skiing should be more important than making a long radius turn.

To facilitate the bending of the ski during this phase of trigger, the ski must be flexible enough and the application of the skier's load on the ski is practically punctual, which makes it possible to obtain a short and very swivel.

During the driving phase of the turn, the skier's position decreases so that the weight of his body is practically applied to the level of the middle of the shoe. In this phase, the skier decreases the bending of the leg, but the ski keeps its trajectory because the edges are inscribed in the snow according to a radius of curvature generated during the phase former.

Finally, at the end of the turn, the skier shifts his weight even more body backwards, so the skier's support area on the ski moves in direction of the heels of the shoes. In other words, the collar enclosing the lower leg is in its most tilted position back. During this phase, the ski must straighten up to register its internal edge in a practically straight trajectory. For this phase, it is better to have a stiffer ski, behaving like a ski longer length to improve stability. We know that, for to obtain this result, the skier's weight must be distributed over the maximum of ski length.

We therefore understand that ideally, the same ski should be behave like a short and very flexible ski when triggering and driving the turn, then transforming into a long, stiff ski for the exit phase of the turn.

This change in stiffness can be ensured by the interaction between the ski and the position of the skier via the boot.

To this end, the document FR 2 644 680 describes a device mounted in an alpine ski boot allowing the transmission of pressures from foot from the inside of the shoe to the outside to cause, by cooperation with a member arranged on the upper face of the ski, the bending of it between the two parts of the binding. Sadly, this solution requires openings made in the sole of the shoe to allow the passage of the transmission organs of efforts, which inevitably results in sealing problems incompatible with the comfort of the user. In addition, the ski boot being intended to block the skier's foot, the stroke necessary to the crushing of the transmission member is also incompatible with good foot support.

Furthermore, the document FR 2 711 321 describes a device intended for decrease the pressure of the ends of the ski on the snow following the support of the skier on the ski. Materially, this device consists of a platform on which the heel piece of the binding is mounted, and by a arms coming to rest on the upper face of the ski, in front of the stop and / or behind the heel. Platform and arm cooperate by means of cam and lever surfaces which cause pressure of the sole of the boot, a tensile force of the stiffener on the ski and therefore its bending. This technical solution makes it possible to modify the stiffness of a ski as a function of the impulse force of the boot on this one ; unfortunately, this solution does not distinguish either the position of the skier on his skis, nor the precise location of the application of the load. This solution therefore goes against the desired ideal behavior described above since it has the same effect on the entire turn without distinction between the successive phases.

The problem which the invention therefore proposes to solve is that of the modification of the stiffness of the ski according to the position of the skier during a turn and therefore flexion of the skier's leg.

Statement of the invention

The invention therefore relates to an alpine ski-boot assembly in which the ski includes at the skate area a safety binding consisting of a stop and a heel piece, intended to secure the ski boot and in which the boot includes a shell cooperating with the attachment and a collar enclosing the lower part of the leg, said collar being articulated relative to the shell to be able tilt forward, especially during the triggering phases of turn.

This shoe-ski assembly is characterized in that it comprises means connecting the collar of the boot and the ski, intended to modify the stiffness and / or camber characteristics of the ski as a function of the inclination of the collar relative to the shell of the shoe.

In other words, the invention consists in providing the ski or the boot, or even both, means of transmitting efforts in function of the inclination of the collar to modify the stiffness and / or the camber of the board.

In other words, the ski and the boot according to the invention are mechanically linked in such a way that the movements of the collar cause variations in force on the upper face of the ski and modify the stiffness, and / or the bending and acessarily the depreciation characteristics.

Of course, this mechanical connection can be made in various ways. manners. Thus, the characteristic means can connect and secure shoes and skiing. They can also be linked to skiing and can be ordered in contact with the collar as a function of its articulation relative to the shell, or be secured to the shoe, controlled by the joint of the collar and influence deformations of the ski.

• un bras associé au collier, disposé latéralement à la coque de la chaussure, dirigé en direction de la semelle de la chaussure, et passant par l'axe d'articulation du collier sur la coque,
• un levier coulissant disposé sensiblement parallèlement à la face supérieure du ski et dont l'extrémité arrière coopère avec l'extrémité inférieure dudit bras,
• un point d'appui situé sur la face supérieure du ski en avant de la butée et coopérant avec l'extrémité avant du levier au moins lorsque le collier est incliné vers l'arrière.

Materially, in a first embodiment family, these means consist of at least:

• an arm associated with the collar, disposed laterally to the shell of the shoe, directed towards the sole of the shoe, and passing through the axis of articulation of the collar on the shell,
• a sliding lever disposed substantially parallel to the upper face of the ski and the rear end of which cooperates with the lower end of said arm,
• a fulcrum located on the upper face of the ski in front of the stop and cooperating with the front end of the lever at least when the collar is tilted backwards.

In other words, the collar has lateral extensions cooperating with a lever forming a linkage capable of sliding on the face upper of the ski, and coming to bear on a fixed or integral point of this one. The movement of the collar causes the inclination to change of its associated arm and thus the sliding of the characteristic lever and by consequently the tensioning of the upper face of the ski when the necklace moves back.

According to different embodiments concerning the associated arms to the collar, these can be either integral with the collar, or only guided in rotation by the collar with respect to a articulation located on a bearing forming a bearing, and fixed on the face superior of skiing.

Regarding the variants of the lever, its rear end can be either articulated on the lower end of the arm, or mounted in a fork fitted to the lower end of the arm.

In the second case, the linkage has a degree of freedom additional, which allows to decouple the movement of pivoting of the arm linked to the collar and the translational movement longitudinal of the characteristic lever.

In an alternative embodiment, the fulcrum located on the face upper of the ski is secured to the front end of the lever. So, when the collar tilts forward, the lever is moved backwards and tends to pull the front part of the ski to cause bending of this one. In this way, the device promotes the bending of the ski during the phases initiating and driving the turn during which the collar is tilted forward, then, when the collar backs up, at the exit of the bend, the lever is pushed forward and tends to press the front part of the skiing on snow thus giving a steep and long skiing behavior, desirable in this turn phase.

In practice, the characteristic lever passes either on either side of the front stopper of the attachment, or below through it.

In a more improved variant of the invention, the point support is connected to the upper face of the ski by a visco-elastic stud, so as to absorb the sudden variations following quick turn sequences. The whole thus constitutes a system more flexible with sought-after damping qualities.

In a second family of embodiments in which the means features are basically arranged on the shoe, these consist of at least one arm secured to the collar arranged laterally to the shell of the shoe, and directed towards the face upper part of the board, the lower end of said arm forming a back located under the sole of the shoe and coming to the contact of the upper face of the board in a forward area of the projection on the upper face of the hinge pin board of the collar on the hull, said return serving as a lever to repel the upper side of the ski down when the collar is tilted forward.

In other words, the collar has a downward extension, by example in the shape of a "U" open at the top, which depending on its tilt exerts a variable pressure on the upper face of the ski. In in other words, the characteristic means make it possible to eliminate the sole of the boot of the upper face of the ski when the collar and tilted forward. The choice of the position of the contact point by relative to the hinge / collar articulation axis makes it possible to obtain bending down the ski when the collar tilts forward, and vice versa return to the initial position by erasing this "U" when the collar is tilted back.

• un étrier chevauchant la coque et comportant un axe transversal reliant les deux branches de l'étrier au niveau du dégagement de lavoûte plantaire, la partie haute de l'étrier étant articulée sur l'avant du collier,
• deux leviers, situés de part et d'autre de la semelle de la chaussure ayant chacun une extrémité avant solidaire de la partie basse de la branche correspondante et une extrémité arrière articulée sur les flancs de la semelle ;

de sorte que lorsque le collier s'incline vers l'avant, l'étrier et les leviers pivotent vers l'avant, ce qui a pour effet de déplacer vers le bas l'axe transversal et de repousser la face supérieure du ski, lorsque le collier est incliné vers l'avant.In another embodiment, the characteristic means are entirely disposed on the shoe and consist of:

• a stirrup straddling the shell and comprising a transverse axis connecting the two branches of the stirrup at the level of the release of the plantar arch, the upper part of the stirrup being articulated on the front of the collar,
• two levers, located on either side of the sole of the shoe, each having a front end secured to the lower part of the corresponding branch and a rear end articulated on the sides of the sole;

so that when the collar tilts forward, the stirrup and the levers pivot forward, which has the effect of moving down the transverse axis and pushing back the upper face of the ski, when the collar is tilted forward.

In an advantageous form, it is possible to separate the control of the stirrup by the collar, which allows, especially during walking phases, to avoid any downward movement of the axis, which would hinder walking. In this embodiment, the collar therefore comprises means to temporarily join the upper part of stirrup.

In a fourth way of carrying out the invention, the means are mechanically connected to the ski and undergo the pushing action of the collar when tilted forward. They are thus constituted by at at least one arm whose lower end is articulated relative to the face upper part of the ski and the upper end of which forms a lever arranged in look at the front of the necklace. In this case, the arm has an area inserted between the sole of the boot and the upper face of the ski, variable height depending on the inclination of the arm.

Thus, the ski has an articulated arm on its upper face, and of which the upper part is intended to cooperate with the collar of the shoe so to rotate when it changes its incline. The lower part of this arm, located between the sole of the boot and the upper face of the ski, has a cam that pivots with the tilt of the arm forward, which spreads the sole of the upper face of the ski and causes the bending of this one.

In a first embodiment, this cam interposed between the sole of the boot and the upper face of the ski is a cam eccentric whose thickness inserted between the upper face of the ski and the bottom of the sole of the shoe is maximum when the collar is tilted forward. In this way, depending on the inclination of the arm and so from the cam, the distance from the upper face and the sole from the shoe is changed.

In another embodiment, the area of the arm interposed between the sole of the boot and the upper face of the ski and a plate forming a substantially right angle with the upper part of the arm, and acting as a cam.

This system being permanently fixed on the ski, means are provided for retract it to facilitate carrying the skis.

Brief description of the drawings

The manner of carrying out the invention as well as the advantages which will emerge clearly from the description of the embodiments which follow, in support of the appended figures in which:

Figure 1 is a side view of a ski of the prior art equipped of a binding formed by a stop and a heel trapping a ski boot.

Figures 2a and 2b are side views of the skate area of a ski fitted with a shoe according to a first embodiment of the invention, when the collar is oriented respectively towards the front and rearward.

Figures 3a and 3b are side views of the skate area of a ski fitted with a shoe according to a second embodiment of the invention when the collar is oriented respectively towards the front and rearward.

Figure 4 is a side view of the skate area of a ski having an alternative embodiment.

Figure 5 is a top view of the ski skate area showing the lever corresponding to the embodiment of FIG. 4.

Figures 6a and 6b are side views of the skate area of a ski fitted with a shoe according to a third embodiment of the invention, when the collar is oriented respectively towards the front and rearward.

Figure 7 is a side view of a shoe equipped with a fourth way of carrying out the invention.

FIG. 8 is a front view of the shoe of FIG. 7.

Figures 9a and 9b are side views of the skate area of a ski equipped with a fourth embodiment of the invention when the collar is tilted forward and back respectively.

Figure 10 is a top view of a variant of the means of Figures 9a and 9b.

FIG. 11 is a detail side view of a cam according to the figure 10.

Ways to realize the invention

As already said, the invention consists in providing the ski and the boot with means for modifying the stiffness of the camber and incidentally damping characteristics of the ski depending on the position of the upper part, that is to say the collar of the shoe. As mentioned, several architectures allow this result to be obtained. In general, the ski according to the invention is presented under the form of a board (1) on which is mounted a fixing constituted a front stop (2) and a rear heel (3). This fixation traps a shoe (4) formed of a lower shell (6) on which is mounted articulated, generally at the malleoli, a collar (5) which encloses the lower leg.

First way of carrying out the invention

This first embodiment is illustrated by FIGS. 2a, 2b, 3a, 3b, 4 and 5 according to different variants of mechanical construction.

In a first alternative embodiment illustrated in FIG. 2a and 2b, the collar (5) of the shoe has lateral extensions (10) forming arms directed downwards, and passing in particular at the level of the malleoli (7). It is of course possible to shift the position of these arms to adapt them to an optimal kinematics of deformation.

The two arms (10) located on each side of the collar (5) meet downwards by a transverse spacer not shown. The lower part of these arms (or the spacer) is articulated on a lever (12) disposed substantially parallel to the upper face (8) of the ski (1), and to the axis longitudinal of the board. This lever (12) extends forward as far as in a zone further than the fixing stop (2). At this stop, the lever can be divided in two and pass on either side of it, or well then cross a raised platform (not shown).

This lever (12), in the form shown, is connected at its front end (13) to the board by a visco-elastic stud (14) with vibration absorption capabilities. Of course, the connection can be made directly by a hinge clevis (not shown) without the principle of the invention being changed. It would be similarly of an alternative embodiment using two arms and two levers arranged symmetrically with respect to the median longitudinal plane of the board, on each side of the shoe.

The operation of the device is as follows.

As illustrated in Figure 2a, during the triggering phases of the turn, the skier tends to flex his leg, which brings the collar (5) forward. In this way, the lower end (11) of the arms (10) of the extension of the collar is pulled back. Concomitantly the lever (12) is slid backwards, which results in a slight recoil of the point of support (13) of this lever (12) on the upper face of the ski. In case the connection is made by a visco-elastic stud (14) fixed by its upper face to lever (12) and by its lower face to the upper surface of the ski, this the latter transmits this traction which leads to bending of the ski (1). Of the so, the contact surface with snow is reduced and the start of a turn it is facilitated. In addition, the shearing of this stud causes a slight amortization.

When the skier finishes his turn, the collar (5) is moved back (see Figure 2b). The lever (12) is pushed forward and the ski area located between the heel piece and the fulcrum (13) is put under traction, which results in an increase in the stiffness of the ski, even a slight bending upward causing an increase in the contact surface with the snow and thus improving the handling and termination of the turn.

In an alternative embodiment illustrated in Figures 3a and 3b, the arms characteristics (16) associated with the collar (5) are slidably mounted by relative to the latter, between two rollers (17, 18) respectively forming front and rear stop, between which the arm (16) can move. Each arm (16) is articulated substantially at the level of the malleoli, on a yoke (19) forming an articulation bearing fixed on the upper face (8) ski.

Thus, when the collar (5) is tilted forward, the rear stop (18) of the collar (5) causes the arm (16) to pivot forward. The lower end (11) of the arm is therefore moved back and causes the recoil lever (12). As previously described, this causes a slight bending of the ski particularly appreciated for the triggering of the turn.

Conversely, when the skier completes his turn and the collar back, the front stop (17) of the collar (5) pushes the arm (16) backwards and rotates it relative to the hinge bearing. The lever (12) is is therefore sliding forward, which leads, as before, an increase in the stiffness of the ski, and possibly a increase in camber.

This embodiment makes it possible to separate the boot from the device and so not to hinder the skier's walk when he has left his skis.

Figures 4 and 5 illustrate variants of mechanical connection between the arm and the lever. So, as seen in Figure 4, the end lower of each arm (10) integral with the collar (5) may not be directly articulated on the lever, but having a fork (30) open down inside which is housed with capacity to translation a spacer (32) forming the rear part of the lever (12) illustrated in Figure 5. This lever (12) can slide longitudinally thanks to to different guide pads (33) arranged on the upper face of the ski.

Thus, when the collar (5) pivots relative to its articulation, the arm (10), in particular its lower end (30) describes a circle and the spacer (32) of the lever (12) is sometimes pushed forward, while moving towards the bottom of the fork (30), sometimes pushed backwards in shifting towards the outlet of the fork (30).

Second way of carrying out the invention

The second embodiment illustrated in Figures 6a and 6b works on a slightly different principle. So, as shown in Figure 6a, the collar (5) has extensions (20) forming arms directed towards the down towards the upper face (8) of the ski. These low ends are located in front of the point of articulation (P) of the collar (5) on the shell (6).

The device can comprise two arms (20) arranged symmetrically on the collar so as to form a stirrup or an "U" open upwards in which the shell (6) is inserted. The operation of this device is the following.

In FIG. 6b, it can be seen that when the collar (5) is inclined towards the front, the arms (20) are therefore oriented downwards and the spacer of the central part (21) of the stirrup rests on the upper face (8) of the ski. In this way, the board is curved between the stop (2) and the heel piece (3) conversely (see FIG. 6a) when the collar (5) is tilted backwards, this stirrup (20, 21) sees its lower part advanced and raised, which removes the effect of the device on the gliding board.

Advantageously, the central part of the stirrup can be accommodated in a transverse recess (22) formed in the sole of the shoe and provided for this purpose to mask the presence in particular when walking.

Furthermore, there may be provided means for disengaging the movement of these arms to allow walking and avoid damage to the caliper.

Third way of carrying out the invention

Figures 7 and 8 illustrate an alternative embodiment of the invention in which the characteristic means are only arranged on the shoe.

Thus, as seen in Figure 7, these means are constituted by a stirrup (35) straddling the front part of the shell (6), each branch (36) of the stirrup (35) extending from the collar to the sole (9) of the shoe at the level of the arch. This stirrup (35) has a transverse axis (37) which connects the two lower ends (38, 39) of each branch (36). This transverse axis (37) is articulated at the level of the front end (40) of two levers (41) whose rear end (42) is articulated on the sole (9) of the shoe. In the illustrated form, the upper part (43) of the stirrup (35) is secured in a reversible manner to the front part (44) of the collar (5), by different equivalent means, namely snap-fastening, hooking or other.

The operation of the device is as follows.

When the collar (5) is tilted backwards, as shown in line full, the upper part (43) of the stirrup is in its height position maximum. It follows that the transverse axis (37) of the stirrup (35) is embedded inside the housing (45) provided for this purpose in the release of the arch of the sole (9). The levers (41) are themselves retracted and are parallel to the plane of the sole (9) of the shoe.

Conversely, when the collar (5) tilts forward, as illustrated in dotted line, the point of attachment of the upper part (43) of the bracket on the collar (5) pivots relative to the point of articulation (P) of the collar on the shell. Given the different articulations of the stirrup (35) and levers (41), the triangle formed by the hooking point levers (41) on the sole (9), the transverse axis of the stirrup (37) and the hooking point of the upper part (43) of the stirrup on the collar deformed. It follows that the transverse axis (37) of the stirrup is moved towards the bottom and therefore pushes the upper face of the ski (8) down. It follows, as mentioned above, a slight favorable bending of the ski in the turn initiation phases.

Fourth way of carrying out the invention

In the variant illustrated in FIGS. 9a and 9b, the ski present on its upper face in the middle of the shoe, a yoke transverse joint (25). On this articulation chappe (25) is mounted a lever (29). This lever (29) is divided into two parts main namely a lower part (26) directly articulated on the yoke (25) and an upper part (27), extending from the lower part up to the level of the shoe collar. In its upper part (26), this lever (29) has an extension (28) disposed in front of the collar of the shoe. The extension zone (28) is advantageously profiled to facilitate cooperation with the front of the collar (5) of the shoe.

The lower part (26) of the lever passes under the sole of the shoe and is therefore interposed between the upper face (8) of the ski and the sole (9) of the shoe, acting like a cam.

The operation of the device according to the invention is the following.

As seen in Figure 9a, when the collar (5) is tilted towards the rear, the cam (26) is in a position in which it has a minimum height H1 interposed between the upper face (8) the ski and the sole (9) of the boot. Skiing therefore has its intrinsic qualities.

Conversely, when the collar tilts forward (see Figure 9b), it drives in its movement the lever (29) which pivots by relative to the yoke (25). It follows that the cam (26) also pivots and that it then has a height H2 greater than the height H1, interposed between the sole (9) of the boot and the upper face of the ski (8). This results in a downward displacement of the upper face of the ski (8) and therefore a bending of the latter. The registration in the turn is therefore improved.

In a variant illustrated in FIG. 11, the cam is formed by a eccentric piece (50) disposed at the lower end of the lever (27). This cam (50) is of non-circular cross-section, for example elliptical, so as to what its height H3, counted perpendicular to the upper face skiing is variable. More precisely, it is important that this height H3 is more important in an advanced position of the lever (27). To allow the rotation of the cam (50), the hinge pin (51) thereof is mounted in two vertical screed lights.

Thus, when the collar (5) is oriented towards the rear, the cam (50) has a smaller section (H4) between the sole (9) and the upper side of the ski.

The hinge pin (51) is in a low position of the screed lights.

Conversely, when the lever (27) is pivoted forward following an inclination of the collar, also forward, the cam (50) also pivots, thereby increasing the distance (H5) between the face upper of the ski and the sole. The articulation axis (51) moves towards the high in the elongated lumen (52) and the desired bending is obtained.

It appears from the above that the device according to the invention, in its different embodiments, cooperate means arranged respectively on the boot and / or on the ski with as result a change in the stiffness of the ski on well areas localized, and / or a modification of the bending during the triggering phase cornering and possibly dampening of ski vibrations.

In conclusion, the characteristics of the ski adapt dynamically position of the skier, which ensures a more aggressive driving and more efficient, particularly appreciated when practicing slalom special.

Claims (16)

Alpine ski / boot assembly, in which the ski (1) comprises, at the level of the skate area, a safety binding consisting of a stop (2) and a heel piece (3), intended to secure the boot (4) to the ski (1), and in which the boot (4) comprises a shell (6) cooperating with the binding and a collar enclosing in the lower part of the leg, said collar (5) being articulated relative to the shell (6) to be able to tilt forwards, in particular during the phases of initiation of a turn, characterized in that the assembly comprises means connecting the collar (5) of the boot and the ski (1), intended to modify the characteristics stiffness and / or camber of the ski as a function of the inclination of the collar (5) relative to the shell (6) of the boot (4). Alpine ski / boot assembly according to claim 1, characterized in that the means consist of at least: an arm (10) associated with the collar (5), disposed laterally to the shell (6) of the shoe, directed in the direction of the sole of the shoe, and passing through the axis of articulation of the collar on the shell, a sliding lever (12) disposed substantially parallel to the upper face (8) of the ski and the rear end (11) of which cooperates with the lower end of said arm (10), a fulcrum (15) located on the upper face (8) of the ski in front of the stop and cooperating with the front end (13) of the lever at least when the collar is tilted backwards. Shoe / alpine ski assembly according to claim 2, characterized in that the arm (10) is integral with the collar (5). Shoe / alpine ski assembly according to claim 2, characterized in that the arm (10) is guided in rotation by the collar (5), relative to an articulation situated on a yoke (19) forming a bearing fixed on the upper face of the ski. Boot / alpine ski assembly according to claim 2, characterized in that the rear end (11) of the sliding lever (12) is articulated on the lower end of said arm (10). Shoe / alpine ski assembly according to claim 2, characterized in that the rear end (11) of the sliding lever (12) is mounted in a fork fitted to the lower end of the arm (10). Shoe / alpine ski assembly according to claim 2, characterized in that the fulcrum (15) is integral with the front end (13) of the lever. Alpine ski / boot assembly according to claim 7, characterized in that the fulcrum (15) is connected to the upper face (8) of the ski by a visco-elastic stud (14). Alpine ski / boot assembly according to claim 2, characterized in that the front end (13) of the lever abuts on the support point (15). Boot / alpine ski assembly according to claim 1, characterized in that the means consist of at least one arm (20) integral with the collar (5) disposed laterally to the shell (6) of the boot and directed in the direction of the face upper (8) of the board, the lower end of said arm (20) forming a return located under the underside of the sole of the shoe and coming into contact with the upper face (8) of the board in a zone located in front of the projection on the upper face (8) of the board of the point of articulation (P) of the collar (5) on the shell (6), said return serving as a lever for pushing back the upper face (8) of the ski (8 ) down when the collar (5) is tilted forward. Shoe / alpine ski assembly according to claim 1, characterized in that the means consist of: a stirrup (35) straddling the shell and comprising a transverse axis (37) connecting the two branches (36) of the stirrup at the level of the arch arch, the upper part (43) of the stirrup coming into contact with the collar (5), two levers (41) located on either side of the sole of the shoe and each having a front end (40) integral with the lower part (38) of the corresponding branch (36) and a rear end (42) articulated on the sides of the sole (9), so that when the collar (5) tilts forward, the stirrup (35) and the levers (41) pivot forward which has the effect of moving down the transverse axis ( 37) and push the upper face (8) of the ski down when the collar (5) is tilted forward. Alpine ski / boot assembly according to claim 11, characterized in that the levers (41) are articulated on the stirrup (35) at their front end (40). Shoe / alpine ski assembly according to claim 12, characterized in that the collar (5) includes means (44) for temporarily joining the upper part (43) of the stirrup. Alpine ski / boot assembly according to claim 1, characterized in that the means consist of at least one arm (27) whose lower end is articulated relative to the upper face of the ski and whose upper end forms a lever (28) disposed opposite the front part of the collar (5), and in that said arm (27) comprises a zone (26, 50) interposed between the sole (9) and the upper face (8) of the ski, of variable height as a function of the inclination of the arm (27). Ski-ski boot assembly according to claim 14, characterized in that the zone of the arm (27) interposed between the sole (9) and the upper face of the ski is an eccentric cam (50) whose thickness H interposed between the upper face (8) of the ski and the underside of the sole (9) is maximum when the collar (5) is tilted forward. Ski-ski boot assembly according to claim 14, characterized in that the region of the arm (27) interposed between the sole (9) and the upper face (8) of the ski is a plate (26) forming a substantially right angle with the upper part of the arm.

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