EP2193824A1 - Alpine ski with controlled bending - Google Patents

Abstract

This alpine ski (1) comprises a mounting zone (6) for a fixation centered on a mounting point (A 6). This ski also comprises a single zone (Z 1, Z 2) of preferred bending deformation, formed between the mounting zone (6) and one or each end (2, 4) of the ski. Under a static load of 900 Newton, applied in the center of the preferred deformation zone (Z 1, Z 2) and in a direction perpendicular to the sole (10) of the ski, the deformation zone (Z 1) adopts a generally dihedral configuration whose arrow is greater or equal to 13 mm, preferably to 15 mm, the ski being supported by two bars (202, 204), arranged under the sole (10), symmetrically on both sides of the zone (Z 1) and distant between them with an axial distance d 200 equal to 400 mm.

Description

The invention relates to an alpine ski as used, in particular, for the practice of "free style", that is to say figures such as jumps or slips in a suitable environment that includes, for example rails on which a skier can slide his skis perpendicular to the longitudinal axis thereof.

It is known to US-B-7,341,271 to shape a ski with zones of variable flexural rigidity, in order to obtain an effective transmission of effort when the ski adopts a curved configuration, with a radius of curvature substantially constant along its length, as represented in the figures of this patent.

The document FR 2 042 420 also describes a ski that has a flexural strength reduction zone. In this case the objective is to facilitate the practice of skiing according to the technique by lateral inclination, which requires the occupation of a rear position. As recalled in the patent preamble FR 2 042 420 , a rotation is performed between the front portion and rear portion of the ski around a point just behind the ski middle, that is to say at the height of the rear binding or heel.

For the practice of free style, skiers sometimes want to make figures in which they slide the spatula front or rear of their ski on a rail. In this case, the skis of the prior art flex smoothly over their entire length, so that it is difficult for a skier to reproduce the same figure several times. Indeed, depending on the positioning of the ski relative to the rail, it is not possible to predict the behavior of the ski with a sufficient degree of accuracy.

It is these drawbacks that the invention intends to remedy more particularly by proposing an alpine ski that facilitates certain figures of free style and whose behavior has a good reproducibility.

To this end, the invention relates to an alpine ski comprising a mounting zone of a fixation centered on a mounting point, characterized in that it comprises a single preferred flexural deformation zone, between the mounting zone and a or each end of the ski.

For the purposes of the invention, a bending deformation of the ski is a bending deformation in a longitudinal direction of the ski.

Thanks to the invention, the preferred flexural deformation zone, the location of which is known to the skier, makes it possible to obtain a localized and reproducible deformation of the ski in the area in question. The spatula, defined between this zone and the end of the ski, on the one hand, and the fastener mounting area, on the other hand, hardly bends. Thus, depending on the characteristics of the preferred deformation zone, the skier can obtain the same behavior several times, especially when he performs figures known as "nose press" or "tail press".

• La zone de déformation privilégiée en flexion est ménagée de telle sorte que, sous une charge statique de 900 Newton (N), appliquée au centre de la zone de déformation privilégiée et selon une direction perpendiculaire à la semelle du ski, cette zone de déformation adopte une configuration globalement en dièdre dont la flèche est supérieure ou égale à 13 mm, de préférence à 15 mm, le ski étant supporté par deux barres (202, 204), disposées sous la semelle (10), de façon symétrique de part et d'autre de la zone (Z₁) et distantes entre elles d'une distance axiale d₂₀₀ égale à 400 mm.;
• La zone de déformation privilégiée s'étend, par rapport au point de montage du ski, à une distance axiale comprise entre 285 et 365 mm. Au sens de la présente invention, une distance axiale est mesurée parallèlement à un axe longitudinal du ski ;
• La zone de déformation privilégiée est centrée sur un point d'assouplissement disposé, par rapport au point de montage, à une distance comprise entre 360 et 480 mm;
• La zone de déformation privilégiée est une zone d'épaisseur réduite par rapport, d'une part, à la zone de montage et, d'autre part, à la spatule définie entre la zone de déformation privilégiée et l'extrémité adjacente du ski. Dans ce cas, la zone de déformation privilégiée a une épaisseur minimale comprise entre 6 et 8 mm, alors que la spatule a une épaisseur minimale comprise entre 8,5 et 11 mm ;
• En variante, la zone de déformation privilégiée est formée par une garniture en matériau plus souple que le ou les matériaux constitutifs de la zone de montage et des spatules du ski ;
• La zone de déformation privilégiée est équipée de moyens de limitation ou de contrôle de sa déformation. Ces moyens peuvent comprendre une plaque déformable fixée sur la face supérieure du ski et qui est sollicitée mécaniquement en fonction de la déformation du ski dans la zone de déformation privilégiée ;
• Le ski comprend deux zones de déformation privilégiées ménagées respectivement entre la zone de montage et l'extrémité avant du ski et entre la zone de montage et l'extrémité arrière du ski.

According to advantageous but non-mandatory aspects of the invention, such a ski may incorporate one or more of the following features, taken in any technically permissible combination:

• The zone of preferred bending deformation is arranged such that, under a static load of 900 Newton (N), applied in the center of the preferred deformation zone and in a direction perpendicular to the ski sole, this deformation zone adopts a generally dihedral configuration whose arrow is greater than or equal to 13 mm, preferably 15 mm, the ski being supported by two bars (202, 204) disposed under the sole (10) symmetrically on both sides other of the zone (Z ₁ ) and distant from each other by an axial distance d ₂₀₀ equal to 400 mm .;
• The preferred deformation zone extends, with respect to the mounting point of the ski, at an axial distance of between 285 and 365 mm. For the purposes of the present invention, an axial distance is measured parallel to a longitudinal axis of the ski;
• The preferred deformation zone is centered on a softening point disposed with respect to the mounting point at a distance between 360 and 480 mm;
• The preferred deformation zone is a zone of reduced thickness relative to the assembly zone and to the spatula defined between the preferred deformation zone and the adjacent end of the ski. In this case, the preferred deformation zone has a minimum thickness of between 6 and 8 mm, whereas the spatula has a minimum thickness of between 8.5 and 11 mm;
• In a variant, the preferred deformation zone is formed by a liner made of a material that is more flexible than the material or materials constituting the mounting zone and the spatulas of the ski;
• The preferred deformation zone is equipped with means for limiting or controlling its deformation. These means may comprise a deformable plate fixed on the upper face of the ski and which is mechanically stressed according to the deformation of the ski in the preferred deformation zone;
• The ski comprises two preferred deformation zones formed respectively between the mounting zone and the front end of the ski and between the mounting zone and the rear end of the ski.

• La figure 1 est une vue en perspective d'un ski conforme à un premier mode de réalisation de l'invention ;
• La figure 2 est une vue de dessus du ski de la figure 1 ;
• La figure 3 est une vue de côté du ski des figures 1 et 2 ;
• La figure 4 est une coupe longitudinale, à plus grande échelle, du détail IV à la figure 3 ;
• La figure 5 est une vue partielle de côté du ski des figures 1 à 4 en configuration de test de sa flexibilité et à échelle plus petite que la figure 4 ;
• La figure 6 est une vue de côté correspondant au détail IV à la figure 3 pour un ski conforme à un deuxième mode de réalisation de l'invention ;
• La figure 7 est une vue analogue à la figure 6 pour un ski conforme à un troisième mode de réalisation de l'invention ;
• La figure 8 est une vue analogue à la figure 6 pour un ski conforme à un quatrième mode de réalisation de l'invention ;
• La figure 9 est une vue analogue à la figure 6 pour un ski conforme à un cinquième mode de réalisation de l'invention ;
• La figure 10 est une vue analogue à la figure 6, mais avec arrachement partiel, pour un ski conforme à un sixième mode de réalisation et de l'invention ; et
• La figure 11 est une vue partielle de côté d'un ski conforme à un septième mode de réalisation de l'invention.

The invention will be better understood and other advantages thereof will emerge more clearly in the light of the following description of seven embodiments of an alpine ski in accordance with its principle, given solely by way of example and with reference to the accompanying drawings in which:

• The figure 1 is a perspective view of a ski according to a first embodiment of the invention;
• The figure 2 is a top view of the ski from the figure 1 ;
• The figure 3 is a side view of the ski Figures 1 and 2 ;
• The figure 4 is a longitudinal section, on a larger scale, from detail IV to figure 3 ;
• The figure 5 is a partial side view of the ski Figures 1 to 4 in test configuration its flexibility and scale smaller than the figure 4 ;
• The figure 6 is a side view corresponding to detail IV at the figure 3 for a ski according to a second embodiment of the invention;
• The figure 7 is a view similar to the figure 6 for a ski according to a third embodiment of the invention;
• The figure 8 is a view similar to the figure 6 for a ski according to a fourth embodiment of the invention;
• The figure 9 is a view similar to the figure 6 for a ski according to a fifth embodiment of the invention;
• The figure 10 is a view similar to the figure 6 , but partially cut away, for a ski according to a sixth embodiment and of the invention; and
• The figure 11 is a partial side view of a ski according to a seventh embodiment of the invention.

The ski 1 represented in Figures 1 to 5 is a so-called free style ski whose X _{1 is} the central longitudinal axis, which extends from its front end 2 towards its rear end 4, these two ends being raised with respect to an attachment mounting zone 6 for shoe 130 shown in figure 3 . This mounting zone is defined in accordance with the NF ISO 8364 standard. The front end 2 is situated on the side of the mounting zone 6 on which the front stop 110 of the fastener is fixed, while the rear end 4 is arranged. the side of the zone 6 where is mounted the heel 120 of the binding.

The width of the skid I ₁ of the ski 1 is greater than 65 mm, preferably greater than 75 mm. Zone 6 is centered on an A ₆ mounting point defined according to the NF ISO 8364 standard. L ₆ is denoted by the axial length of the mounting zone 6.

A length or dimension is said to be "axial" when it extends parallel to the axis X ₁ , whereas it is said to be "transverse" when it extends perpendicularly to this axis. The width of the shoe I ₁ is a transverse width.

The zone 6 has, along its length L _6, a minimum thickness e ₆ of between 8 and 25 mm. The thickness of the ski in zone 6 is, for a desired rigidity, a function of its width in this same zone.

We note 8 respectively the upper face of the ski 1 and 10 its sole.

A zone Z ₁ of preferred deformation of the ski 1 is formed between the mounting zone 6 and the end 2, that is to say at the front of the zone 6. A second preferred deformation zone Z ₂ is provided between zone 6 and end 4, that is to say at the rear of zone 6.

Zones Z ₁ and Z ₂ are produced by a localized reduction in the thickness of ski 1.

These zones Z ₁ and Z ₂ are provided to adopt a generally dihedral configuration when the ski undergoes a bending deformation force. This is particularly the case when a skier realizes a so-called "nose press" figure, that is to say the support of the spatula before his ski on a rail, in which case the zone Z ₁ deforms in a privileged manner , before the front spatula and the mounting area. Similarly, the zone Z ₂ deforms when the user makes a figure called "tail press", that is to say the support of the rear spatula of his ski on the rail, before the rear spatula and the zone mounting.

As is clear from the figure 4 , the ski 1 comprises, in addition to the sole 10, an upper reinforcement 12 made of glass fibers, a lower reinforcement 14, also made of glass fibers, and a core 16 which may be of wood or foam. Reinforcements 12 and 14 are optionally loaded with metal, for example aluminum. Reinforcements 12 and 14 may also be made of carbon fiber, aramid, Kevlar (trademark), steel, aluminum, titanal or other metal alloys. These reinforcements may also consist of several layers, for example a layer of glass fibers and an aluminum layer.

A topcoat 15, commonly called the "top", is affixed to the reinforcement 12 and carries the decoration of the ski. It can be performed by assembling several layers.

The thickness e ₁₆ of the core 16 is reduced locally in order to form the zone Z ₁ , so that the total thickness e ₁ of the ski 1 in the zone Z ₁ has a minimum value of between 6 and 8 mm. that is to say a value substantially lower than that of the thickness e ₆ . The thickness e ₁ corresponds to the sum of the minimum thickness e ₁₆ and the thicknesses of the reinforcements 12 and 14 and the soleplate 10, these two thicknesses being substantially constant over the length of the ski 1.

In practice, the minimum value of the thickness e ₁₆ is greater than 1.5 mm to limit the risk of rupture of the core 16 in the zone Z ₁ . However, it is possible, in a variant, to provide an interruption of the core 16 at the level of the zone Z ₁ and / or of the zone Z ₂ , which makes it possible to put in contact the upper and lower reinforcements 12 and 14 so as to limit the constraints. in these.

We note 18 the front spatula of the ski 1, which is defined in the present application as the portion of the ski extending between the zone Z ₁ and the end 2. The minimum thickness e ₁₈ of the spatula 18 is between 8.5 and 11 mm. This thickness is greater than in conventional skis where it has a value generally between 5 and 7.5 mm. This is to be compared with the fact that the spatula 18 can be substantially stiffer than in conventional skis since a ski flexibility is obtained essentially at the Z ₁ and Z ₂ zones.

In practice, the rigidity of the spatula 18 depends on the distance between the reinforcements 12 and 14, that is to say, the thickness of the core 16. In the case where the spatula comprises a top or remote dressing of the upper reinforcement , with possible interposition of a lining, this does not really affect the rigidity of the spatula because the distance between the reinforcements remains similar to that of the example of the figures. The spatula may, for example, have a total thickness of 16 mm having the same rigidity as the spatula 18 shown in the figures, if the thickness of the sandwich formed of the elements 12, 14 and 16 has a minimum value of between 8, 5 and 11 mm.

The rear spatula of the ski 1 is defined between the zone Z ₂ and the end 4. The minimum thickness e ₁₉ of the spatula 19 has the same value as the thickness e ₁₈ .

We denote by Δ ₁ a line perpendicular to the axis X ₁ and at which the thickness of the ski begins to decrease, away from the point A ₆ , with respect to the value of the thickness e ₆ . Δ ' _{1 is} a line perpendicular to the axis X ₁ and from which the thickness of the ski 1 begins to decrease, away from the end 2, with respect to the value of the thickness e ₁₈ . Zone Z ₁ is defined between the lines Δ ₁ and Δ ' ₁ .

We denote A ₁ a central point of the zone Z ₁ , this point being equidistant from the straight lines Δ ₁ and Δ ' ₁ and located on the face 8, halfway between the lateral edges 20 and 22 right and left of the ski 1. This point can be considered as a softening point of the ski in zone Z ₁ .

The axial length L ₁ of the zone Z ₁ , that is to say the axial distance between the straight lines Δ ₁ and Δ ' ₁ , has a value of between 150 and 200 mm. The axial distance D ₁ between the straight line Δ ₁ and the mounting point A ₆ has a value of between 285 and 365 mm. The axial distance D ' ₁ between points A ₁ and A ₆ is between 360 and 480 mm.

It is important that the zone Z ₁ is sufficiently far from the middle of the ski so that the preferred zone of deformation has a limited effect on the normal functioning of the ski, that is to say on flat track without particular figure is made by the skier. In practice, as can be seen in figure 3 the zone Z _{1 is placed} well beyond the rear fixing. Thus in normal use, the support of the skier is not changed. On the other hand, as soon as for the needs of a figure, the skier comes resting on the back of the ski, the preferred deformation zone comes into play and it determines precisely where the ski will actually deform.

The zone Z ₂ is substantially symmetrical with the zone Z ₁ with respect to the mounting point A ₆ . It extends between two straight lines Δ ₂ and Δ ' ₂ perpendicular to the axis X ₁ and we denote by A ₂ the central point, or softening point, of the zone Z ₂ on the face 8. The axial length L ₂ of zone Z ₂ is between 150 and 200 mm and the line A ₂ extends at a distance D ₂ between 285 and 365 mm with respect to the mounting point A ₆ . The distance D ' ₂ between points A ₂ and A ₆ is between 360 and 480 mm.

In a variant, zone Z ₂ may not be at the same distance from point A ₆ as zone Z ₁ . In particular, zones of different lengths can be provided, along the axis X ₁ , between the mounting zone 6 and the zones Z ₁ and Z ₂ .

The lengths L ₁ and L ₂ are not necessarily equal, as well as the lengths D ₁ and D ₂ , on the one hand, D ' ₁ , D' ₂ , on the other hand.

It is noted that the ski 1 comprises a single zone Z ₁ preferred deformation between the mounting zone 6 and the end 2, so that the ski 1 is likely to deform in a single zone between the front of the shoe of the skier and the front end of the ski. Similarly, a single preferred deformation zone is provided between the mounting zone 6 and the rear end 4, so that the skier knows that his ski can only deform in a single zone between the back of his shoe and the back end of the ski.

Given the existence of zones Z ₁ and Z ₂ , and the relative stiffness of the mounting zone 6 and spatulas 18 and 19, the bending behavior of the ski 1 is reproducible, which facilitates its control by the skier, including for the realization of elaborate free-style figures.

This behavior can be characterized by measuring the bending properties of the ski 1 when exerting a given force on the ski, supported by two bars 202 and 204 of circular section, whose centers are distant from each other by an axial distance d ₂₀₀ equal to 400 mm and which are arranged under the sole 10, symmetrically on either side of the zone Z ₁ .

When the ski 1 bears on the two bars 202 and 204 under the effect of its weight, its sole 10 is substantially flat in the zone Z ₁ and its trace in the plane of the figure 5 is a straight line Δ ₃ horizontal and which passes through the vertices of the bars 202 and 204.

When in the center of zone Z ₁ , that is to say in the vicinity of point A ₁ , and in a direction going from face 8 towards sole 10, a force E ₁ perpendicular to sole 10 is exerted, while ski 1 is resting on bars 202 and 204 as explained above, the ski flexes in zone Z ₁ and adopts, in the vicinity of this zone, a generally dihedral configuration, as shown in FIG. figure 5 .

We note f the deflection arrow of the zone Z ₁ in the configuration of the figure 5 . This arrow is the maximum distance between the line Δ ₃ and the sole 10, when the ski 1 is subjected to the force E ₁ .

The thicknesses and distances mentioned above are such that, for a static force E ₁ of intensity equal to 900 Newton, that is to say corresponding to a weight of about 90 kg, and a distance d ₂₀₀ equal to 400 mm, the arrow f is greater than 13 mm.

These thicknesses and distances are preferably chosen, by numerical simulation or by tests on samples, so that this arrow is greater than 15 mm.

Zone Z ₂ is also configured so that the arrow defined in the same conditions has a value greater than 13 mm, preferably 15 mm.

This gives the ski 1 a good behavior when the skier makes figures as mentioned above.

In addition, when the skier evolves into powder snow, the flexion zone Z ₁ allows the spatula 18 to pivot upwards about an axis perpendicular to the axis X ₁ and passing in the vicinity of the point A ₁ , this which facilitates the lift of the ski 1.

In the second to seventh embodiments represented at Figures 6 to 11 elements similar to those of the first embodiment bear the same references.

Ski 1 of the figure 6 comprises, above the zone Z ₁ of preferred deformation, a metal plate 30 immobilized on the ski 1 by means of two screws 32. This plate can be immobilized on the ski 1 by any other suitable fastening means. Alternatively, the plate 30 is made of composite material.

An elastomer block 34 is disposed between the plate 30 and the upper face 8 of the ski 1. The plate 30 makes it possible to maintain the longitudinal stiffness of the ski at a value comparable to that of a conventional ski, as long as this plate 30 do not flambe. In other words, the ski deforms little or does not deform in the zone Z ₁ as long as the bending force is not sufficient to cause the plate 30 to flare up. Compared to the embodiment of the Figures 1 to 5 a behavior is thus obtained with a threshold value of the bending force which makes it possible to obtain an effective flexion in the zone Z ₁ .

The elastomer block 34 ensures that, when the plate 30 is flaming, it deforms upwards and not towards the sole 10 of the ski 1. This block is however optional insofar as a preferred direction of buckling of the Plate 30 can be obtained by means of a suitable conformation thereof.

In this embodiment, the spatula 18 is not thicker than in a conventional ski. It has a thickness e of between 5 and ₁₈ 7.5 mm. Indeed, it can be considered that the plate 30 at least partially offsets the loss of rigidity of the ski, while in the first embodiment, it is the thick spatulas that perform this function.

In the embodiment of the figure 7 , a blade or plate 40 stop against-arrow is immobilized on the ski by a screw 42 disposed at one of its ends 43. The blade 40 extends above the zone Z ₁ preferred deformation of the ski 1. At its end 44 opposite to the screw 42, the blade 40 is folded to bear against a stop 46 fixed relative to the ski 1. Thus, in the event of effort tending to deform the spatula 18 in the direction of the arrow F ₂ to the figure 7 , the blade 40 bears at its end 44 against the abutment 46, which limits the deformation of the ski 1.

To give more responsiveness or "peps" to the ski 1, a spring 48 is interposed between the end 44 of the blade 40 and a stop 49 fixed relative to the ski 1. This spring exerts on the end 44 a force E ₂ directed towards the screw 42, which can allow the blade 44 to restore the spring energy after bending and give more rebound to the ski.

In the embodiment of the figure 8 , two stops 50 and 60 are reported in the zone Z ₁ of preferred bending and each have a face 52 or 62 intended to bear against the face of the other stop, so as to limit the bending of the ski 1 in the area Z ₁ . These stops therefore make it possible to limit the deformation of the ski 1 to a predetermined angle corresponding to the angle β defined between the faces 52 and 62.

According to one aspect of the invention which is advantageous but which is not shown, an elastomer wedge can be arranged between the faces 52 and 62, which improves the progressivity of the flexion in the zone Z ₁ and gives better performances. to the revival of skiing.

In the embodiment of the figure 9 the zone Z ₁ of preferred deformation of the ski 1 is formed by a succession of elastomer strips 70 inserted in the ski 1, from its upper face 8, and which are intended to be compressed to allow flexion of the ski.

The length of the slats 70, taken parallel to the thickness e ₁ of the ski 1, is increasing then decreasing along the length of the zone Z ₁ taken parallel to the axis X ₁ . As a variant, all the lamellae 70 may have the same length.

In the embodiment of the figure 10 , an elastomer block 80 is disposed in the thickness of the ski 1, which creates a zone Z ₁ of preferred deformation, this zone being covered with a blade 90 against-arrow operating in a manner similar to the blade 40 of the embodiment of the figure 7 . Stop 46 is replaced by one or more screws 96 fixed in the ski 1 and against which can bear the ends of oblong orifices 94 formed in the blade 90.

In the embodiment of the figure 11 an elastomer block 100 extends on either side of an island 102 forming the upper part of the mounting zone 6 of the ski 6. The elastomer block has a minimum thickness ₁₀₀ under the island 102, this thickness increasing at the front and at the rear of the island 102 to create two zones Z ₁ and Z ₂ of preferred deformation of the ski 1.

An upper reinforcement 104, visible by tearing at the figure 11 , circulates in the spatulas 18 and 19 of the ski 1 and also under the block 100 and the island 102, this in order to guarantee a certain rigidity of the ski 1.

The deformation zones Z ₁ and Z ₂ of the skis of the embodiments of the Figures 6 to 11 have generally the same behavior as those of the first embodiment: under a static load of 900 Newton, applied in the center of each of these deformation zones in a direction perpendicular to the sole of the ski, each deformation zone adopts a generally dihedron with an arrow f, which has a value greater than or equal to 13 mm, preferably 15 mm, when the ski bears on two beams 400 mm apart.

The technical characteristics of the various embodiments mentioned above can be combined with each other. For example, a counter-arrow stop blade can be used in the embodiment of the figure 9 . Plates such as the plate 30 of the embodiment of the figure 6 may be used in the other embodiments, in addition to or in substitution for a counter-arrow stop blade. It is not mandatory to use a spring such as spring 48 in the embodiments equipped with a counter-arrow stop blade.

The invention has been described in a two-spatulate freestyle ski. However, it applies to other types of ski, including a ski which only the front spatula is raised.

Claims (9)

Alpine ski (1) comprising a mounting zone (6) for a fixation centered on a mounting point (A ₆ ), characterized in that it comprises a single zone (Z ₁ , Z ₂ ) of preferred deformation, between the mounting zone (6) and one or each end (2, 4) of the ski (1), the preferred deformation zone (Z ₁ , Z ₂ ) is centered on a softening point (A ₁ , A ₂ ) arranged with respect to the mounting point (6) at a distance (D ' ₁ , D' ₂ ) of between 360 and 480 mm. Alpine ski according to claim 1, characterized in that the zone (Z ₁ , Z ₂ ) of preferred bending deformation is arranged such that, under a static load (E ₁ ) of 900 Newton, applied in the center of the zone of preferred deformation (Z ₁ ) and in a direction perpendicular to the sole of the ski, the deformation zone (Z ₁ ) adopts a generally dihedral configuration whose deflection (f) is greater than or equal to 13 mm, preferably greater than or equal to 15 mm, the ski being supported by two bars (202, 204), disposed under the sole (10), symmetrically on both sides of the zone (Z ₁ ) and distant from each other by an axial distance d ₂₀₀ equal to 400 mm. Alpine ski according to one of the preceding claims, characterized in that the preferred deformation zone (Z ₁ , Z ₂ ) extends, relative to the mounting point (A ₆ ) of the ski (1), at an axial distance (D ₁ , D ₂ ) between 285 and 365 mm. Alpine ski according to one of the preceding claims, characterized in that the preferred deformation zone (Z ₁ , Z ₂ ) is a zone of reduced thickness in relation, on the one hand, to the mounting zone (6) and on the other hand, with the spatula (18, 19) defined between the preferred deformation zone and the adjacent end (2, 4) of the ski. Alpine ski according to claim 4, characterized in that the preferred deformation zone (Z ₁ , Z ₂ ) has a minimum thickness (e ₁ ) of between 6 and 8 mm, and in that the spatula (18, 19) has a minimum thickness (e ₁₈ ) of between 8.5 and 11 mm. Alpine ski according to one of claims 1 to 3, characterized in that the preferred deformation zone (Z ₁ ) is formed by a liner (70; 80; 100) of softer material than the material or materials constituting the zone mounting (6) and spatulas (18, 19) of the ski (1). Alpine ski according to one of the preceding claims, characterized in that the preferred deformation zone (Z ₁ ) is equipped with means (30; 40; 50; 60; 90) for limiting or controlling the deformation of the ski (1 ) in this area. Alpine ski according to claim 7, characterized in that the limiting or control means comprise a plate (30; 40) fixed on the upper face (8) of the ski (1) and which is mechanically biased as a function of the deformation of the ski. ski in the zone of preferred deformation (Z ₁ ). Alpine ski according to one of the preceding claims, characterized in that it comprises two zones (Z ₁ , Z ₂ ) of preferred deformation respectively formed between the mounting zone (6) and the front end (2) of the ski ( 1) and between the mounting area and the rear end (4) of the ski.

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