EP2324892B1 - Alpine ski with large ski tip and strong side cut - Google Patents

Alpine ski with large ski tip and strong side cut Download PDF

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Publication number
EP2324892B1
EP2324892B1 EP10014688.5A EP10014688A EP2324892B1 EP 2324892 B1 EP2324892 B1 EP 2324892B1 EP 10014688 A EP10014688 A EP 10014688A EP 2324892 B1 EP2324892 B1 EP 2324892B1
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Prior art keywords
ski
width
value
skis
spatula
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German (de)
French (fr)
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EP2324892A1 (en
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Bertrand Krafft
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Salomon SAS
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Salomon SAS
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof
    • A63C5/0405—Shape thereof when projected on a plane, e.g. sidecut, camber, rocker

Definitions

  • the invention relates to gliding machines, in particular, the invention relates to skis for the practice of alpine skiing.
  • a pair of alpine skis consists of two boards that are substantially identical or at least symmetrical with respect to one another.
  • One of the basic techniques of skiing requires that to go in a straight line, the user maintains his body in a plane perpendicular to the ground while when he wants to turn, he tilts his body towards the inside of the turn. This has a direct consequence on the positioning of the skis in relation to the terrain.
  • the skis are flat on the ground, they rest on their lower surface of sliding, called sole.
  • sole When turning, the user gives his skis an inclination to the ground. It is then the lower edges, commonly called the edges, which come into contact with the ground. In top view, the outline of the lower edges is called dimension lines.
  • the geometry of the dimension lines plays a determining role in the behavior of the ski and in particular, the dimension lines define the type of steering that must be put in place. the skier.
  • the edges are in particular defined as the lower edges of the ski which are located between the widest area of the ski located at the front of the ski and that located at the rear.
  • the dimension lines swallow very important rays, commonly greater than 30 m.
  • the maximum width in the front portion and the maximum width in the rear portion had substantially the same values.
  • the zone of minimum width of the ski also called narrow point, is in the middle of the ski, at the level of the fastening zone of the shoes.
  • the document DE 41 12 950 proposed a new form of ski with the aim of improving cornering behavior and making changes of direction faster.
  • This form of ski is characterized in that the concave portion is reduced in length and has a reduced radius compared to what was done at the time.
  • This concave portion is longitudinally substantially centered on the middle of the ski.
  • the ski's dimension lines are constituted by rectilinear portions. These rectilinear portions of dimension line whose length is between 10 and 20 cm ensure the junction between the concave portion and on the one hand, the spatula and on the other hand the heel.
  • Such a geometry gives a ski whose turnability can be improved but whose behavior is not fluid.
  • skis are particularly adapted to the practice on groomed track.
  • Such a ski is, for example, described in the patent application EP 579 865 .
  • a ski whose minimum width of the ski is at the fastenings in the central part of the ski, and is 63 mm while the widths at the spatula, the front part of the ski, and at the heel, its rear part, are respectively 110 mm and 100 mm. Skis of this kind made it possible to approach a new practice of skiing, the "carving", that is to say the practice of cut corners.
  • skis shorten and thicken as shown in the patent specification US 6,603,522 .
  • skis of length less than 1730 mm are described, the spatula of which has a width of 110 and 120 mm for a pad having a width of between 82 and 99 and a heel of width of between 105 and 115 mm, the difference between the width of the spatula and that of the heel being maintained between 4 and 12 mm.
  • the objective that had led to the realization of such skis was to optimize the torsional stiffness by combining a relatively large width with a relatively small length. This bias means that these skis are not very versatile. It is difficult to design a ski with this geometry that will have an optimal behavior both on the track and off-piste.
  • skis It is also difficult to design a ski according to this geometry that can be adapted to different skiers with different technical levels or commitment (beginners, leisure, competition).
  • the shortening of the length of the skis did not, however, call into question the orientation that had been taken during the 1990s for parabolic skis.
  • these skis always have the characteristic that the area of minimum width of the ski is in the center of the ski, at the middle of the ski boot.
  • skis Since the 2000s, the practice "freeride", essentially practical off-piste snow virgin, is developing and specific skis have been developed by manufacturers. These skis are very wide and have pad widths that can reach 140 mm. These skis are of course not at all versatile, they are very difficult to maneuver on the track and are reserved for experienced skiers. Indeed a very large width in the central part makes the control on track require muscular and almost impossible for a beginner skier or having skied little. Such skis are for example described in US patent application 2008/0042400.
  • the tip of a ski is the part of the ski that is bent upward to easily overcome obstacles.
  • the length of the spatula is defined by the distance separating the tip of the ski from the front contact line (the front limit of the contact zone of the lower face of the ski on a flat surface). We can choose to determine this length by measuring the projection on a flat surface, it is the projected length, or to measure the nominal length, it is the developed length. In the rest of the talk, when we talk about length, it will be developed length.
  • the object of the invention is to provide an alpine ski that has optimal behavior both on and off piste.
  • the objective of the invention is to provide a ski that offers a skier with little practice and / or low muscular strength the ability to ski in all circumstances, on any type of snow, on the piste or off-piste.
  • the objective of the invention is to provide a new ski family that allows a new technique of alpine skiing.
  • the object of the invention is also to provide a new family made up of a plurality of pairs of skis, all of which have optimal behavior on and off-piste but which are distinguished from each other by a preferential aptitude on the runway or off-piste.
  • the object of the invention is also to provide a ski whose geometry combines the advantages of skis with side lines dug and those of skis with wide side lines.
  • the object of the invention is also to provide a ski which has a spatula promoting the behavior in the powder snow.
  • the object of the invention is also to provide a ski whose front end does not vibrate during its use on the track.
  • the objective of the invention is to provide a ski that offers a resolutely new behavior in that the front part of the ski (the one located in front of the ski boot) and the rear part of it (the one located behind of the shoe) each offer a different behavior.
  • a ski provided for the practice of alpine skiing comprising a front portion, a rear portion and a central portion, adapted to receive shoe attachment means, which are interleaves between the front part and the rear part; ski in which the front portion comprises a portion of greater width of value "S", which is between 135 mm and 165 mm, and wherein the difference " ⁇ t" (delta-t) between the value "S" of the maximum width of the front part and the value "T" of the maximum width of the rear part (T) is greater than 25 mm.
  • this ski comprises a gliding sole intended to be in contact with the snow, an inner structure and a top.
  • the ski of the figure 1 is characterized by resolutely new dimension lines.
  • the central portion 4 of the ski receives the safety fasteners 5 which hold the ski boot of the user (not shown).
  • the smallest width of the central portion 4, called shoe, has a value C equal to 88 mm. This is a relatively broad value compared to skis as they were designed until the early 1990s. However, the widths of skis currently recommended by powder skis are not achieved. Such a width between 60 and 120, preferably 70-100 gives the ski a great versatility of use and makes it accessible to a greater number of users, from beginners to advanced skiers.
  • the figure 1b shows a top view in detail of the central part of the ski.
  • the middle shoe line is a marking worn on the ski by the manufacturer and which indicates the recommended positioning of the ski bindings so that the shoe, once attached to the ski, is centered on this line of the middle of the shoe.
  • the line where is the smallest width of the central part commonly called the narrow point of the ski is moved back relative to the line of the middle of shoe (MC) a value greater than 150 mm.
  • the distance LC separating the narrow point and the middle of the shoe is 271 mm.
  • the rear part 3 of the ski has a zone of greater width of value T between 90 and 110 mm.
  • Such a width allows a relatively easy support at the end of the turn, without the need to take very strong support on the edges.
  • the value T is 100 mm.
  • the heel described at figure 1 is a heel with a pointed shape. This is only one of the many forms that can take the heel, this form is not limiting in the context of the invention.
  • the front portion has a front portion 2, the maximum width, the value S, is much greater than the maximum width of the heel portion.
  • the difference " ⁇ t" (delta-t) between the value "S" of the maximum width of the front portion 2 and the value "T” of the maximum width of the rear portion 3 is greater than 25 mm. It has also been possible to demonstrate that these effects are amplified to the point of marking a significant difference in behavior with the skis known in the prior art, as soon as the delta " ⁇ t" value is greater than 32 mm. Indeed, with a value " ⁇ t” equal to or greater than 32 mm, the difference in behavior generated by the geometry of the front portion and the rear portion of the ski becomes more significant.
  • the length of the spatula to a value of 190 mm.
  • it will be chosen, on the other hand, to limit the maximum width of the spatula "S” as a function of the width of the rear part "T” so that the value " ⁇ t" (delta-t) remains lower. at 60 mm, preferably less than 55 mm.
  • the front portion 2 has a maximum width "S" which is equal to 150 mm, there is a difference " ⁇ t” equal to 50 mm.
  • the ski described at figure 1 therefore has a spatula of very large width, that is to say a width which is of the same order as the widths of skate spatula currently known but which are exclusively intended for use "Freeride".
  • the current "freeride" skis are much too wide to offer easy driving on a groomed track. Thanks to its wide spatula, the ski 1 enjoys a good behavior in deep snow. In addition, its driving on the track is much easier than that of a ski type "Freeride". This is a particularly versatile ski whose track behavior as off-piste is optimized, especially because of a minimum width of the central portion equal to 88 mm.
  • a multi-purpose ski such as the ski described in figure 1 we will try to limit the volume out of snow while keeping a sufficiently long spatula. To do this, we will favor pointed spatulas and the line of greater width at the front is at a relatively low height as can be seen a little further in the text.
  • the figure 1a shows the "sharp" character of the outline of the front portion 2 of the ski 1. This sharp character is highlighted by measuring the width of the ski near the front end of the ski, the tip 6. This measurement, which 'P' is made at a distance of 30 mm (developed length) from the point 6 of the ski 1. In the case in point, the value of P is 55 mm.
  • spatula has a pointed contour insofar as the value "P" is less than or equal to half (50%) of the maximum width of the front part 2, the value "S" (P ⁇ 0.5 x S).
  • a pointed spatula is relatively long.
  • the skis according to the invention having the best performance are those which have a spatula length of between 150 and 320 mm.
  • skis according to the invention sharp spatulas (P ⁇ 0.5 x S) will be used. It should however be noted that skis according to the invention whose spatulas are moderately pointed, that is to say having a value "P" less than or equal to 60% of the value "S”, give satisfactory results. On the other hand, we can also consider skis according to the invention having round spatulas.
  • the figure 2 shows in side view the ski 1 of the figure 1 .
  • the ski rests on a flat surface 9 at the level of two lines; the front contact line 7 and the rear contact line 8.
  • the length of the spatula "Ls”, measured between the line of greater width and the tip 6 of the ski is equal to 256 mm.
  • the front contact line is located near the line 10 of greater width of the spatula of the ski. As can be seen on the figure 2a this proximity is reflected by the fact that, at the level of the line of greater width, the sole of the ski is at a height "Hs", preferably less than 10 mm.
  • the ski described at figure 1 is a ski whose total length is equal to 1900 mm.
  • this is not a limitation of the invention, and the particular geometry of the invention can be easily adapted for longer or shorter skis.
  • the figure 3 represents a second embodiment of the invention. As in the embodiment described above, it is a ski designed for versatile use track and off-track with a slight predisposition for carving skiing and use in the fresh snow.
  • the widest ski width, the value "T”, is 105 mm
  • the minimum width of the central part 4 is 80 mm
  • the largest width of the spatula the value "S” is 140 mm.
  • the spatula is very long, the value "Ls” is 300 mm, and very pointed, the value "P” is 42 mm, which corresponds to 30% of the largest width of spatula.
  • the figure 3a is a detailed view of the ski described in figure 3 which makes it possible to visualize the relation between the different characteristic lines of the half-length back of the ski.
  • the middle shoe line, MC is placed at a distance LA from the line of greater width heel, T.
  • the length LA corresponds to a certain percentage of the total length of the dimension line.
  • the line of smaller ski width in the central part, also called the narrow point, and noted C in the figure is located between the lines MC and T.
  • the distance LC separating the lines C and MC is greater at 150 mm. That is to say, the narrow point is behind the shoe when it is fixed on the ski.
  • the figure 4 represents a third embodiment of the invention for which the values S, C and T are respectively 160, 103 and 117 mm.
  • the spatula is relatively long, the value "Ls" worth 300 mm.
  • This is a particularly suitable ski for off-piste practice. It is a freeride type ski to use one of the categories currently used by manufacturers to segment their product offering.
  • the front part 2 is also characterized by its "sharp” character. Indeed the width "P" measured at a distance of 30 mm from the tip 6 is equal to 53, that is to say corresponding to about 34% of the value of the width "S" of the spatula
  • the figure 5 represents a fourth embodiment of the invention for which the values S, C and T are respectively 140, 68 and 90 mm.
  • the spatula has a length, "Ls", of 190 mm and has a pointed shape with a value "P” equal to 57 mm (40% of the value S). This is a particularly suitable ski for track practice.
  • Table 1 summarizes the geometric data of a complete range of skis according to the invention. These skis are characterized by an improved versatility compared to the skis known until now, while each having a field of predilection.
  • the ski range presented in Table 1 comprises 18 skis each having a different geometry but which share all the innovative features of the invention. It should be noted that the total length of the skis is not mentioned in this table. Each of the skis constituting this range has been developed in an average length of between 2000 and 1600 mm. To build the global offer, the manufacturer will decline each ski in different sizes to fit each geometry to the weight and size of the users.
  • the first three skis on the board including the ski represented in the figure 5 , are skis that will give their best performance on track due to a relatively small pad width. However, when the skier will practice off-piste with one of these skis, he will enjoy a good lift thanks to a long and wide spatula. In the case where, as in figure 5 , the ski has a pointed spatula, these skis will be perfectly adapted to the catch of speed and for example to the practices of competition of "descent" and "giant slalom".
  • the eight skis at the bottom of the board are designed for predominantly off-piste use. However, thanks to a minimum width in the central portion not exceeding 130 mm, and preferably not exceeding 120 mm, these skis is very easy to fly on the track. On piste, these skis will not ask the user, no more driving effort than skis specially designed for track practice. Here too, the choice of a pointed spatula, as for the ski represented in the figure 4 will further increase the versatility of use of these skis.
  • skis which are between 70/30 and 30/70 ratio of track suitability to off-road ability, are skis that are designed for the track and the off-piste.
  • the skis represented at figures 1 and 3 are examples of such versatile skis.
  • one aspect of the invention is related to the fact that the narrow point is retracted from the boot medium by more than 150 mm, preferably greater than 180 mm.
  • Table -2 compiles the values of four different ski geometries sharing the same spatula and heel width, but whose narrow point is at different positions.
  • Table 2 - S VS T .delta.t LB LC 160 106 125 35 515 177 160 118 125 35 400 290 160 123 125 35 261 431 ( figure 6 ) 160 125 125 35 0 692 ( figure 7 )
  • the first two lines of the table correspond to ski geometries well suited for off-piste practice, whose position of the narrow point with respect to the middle of the shoe, at 177 and 290 mm, respectively, make it possible to provide geometries which ensure good directional mobility to skiing.
  • the third line of the table corresponds to a geometry of which an example of ski is described in figure 6 .
  • the line of the narrow point is very remote.
  • the distance separating the narrow point from the line of greater width of the heel corresponds substantially to one third (1/3) of the distance separating the line of greater width from the heel to the middle of the shoe.
  • the narrow point retreat improves the stability of the ski at high speed and due to a difference in spatula / heel width equal to 35 mm, this ski retains good versatility.
  • the figure 7 shows a ski whose difference spatula / heel is also equal to 35 mm, but whose narrow point is moved back as far as possible, that is to say up to the level of the broad heel point.
  • the narrow point line C and the line of greater width heel T merge.
  • the complete dimension lines of the ski join the narrow point C to the line of greater width spatula S.
  • the dimension line is a curved line whose average radius of curvature may be greater than that of the other embodiments of the invention. For example, the average radius of the dimension line may exceed 30 m or 50 m. This is called a stretched sideline.
  • the ski represented at figure 7 offers a versatility of practices, including freeride practice combined with excellent directional stability.

Description

L'invention concerne les engins de glisse, Notamment, l'invention concerne les skis destinés à la pratique du ski alpin.The invention relates to gliding machines, in particular, the invention relates to skis for the practice of alpine skiing.

Une paire de skis alpins est constituée de deux planches sensiblement identiques ou au moins symétriques l'une par rapport à l'autre. Une des techniques de base de la pratique du ski veut que pour aller en ligne droite, l'utilisateur maintien son corps dans un plan perpendiculaire au terrain tandis que lorsqu'il veut tourner, il incline son corps vers l'intérieur du virage. Ceci a une conséquence directe sur le positionnement des skis par rapport au terrain. Lorsqu'il va droit, les skis sont à plat sur le terrain, ils reposent sur leur surface inférieure de glisse, appelée semelle. Lorsqu'il tourne, l'utilisateur donne à ses skis une inclinaison par rapport au terrain. Ce sont alors les arrêtes inférieures, qu'on appelle communément, les carres, qui viennent au contact du terrain. En vue de dessus, le contour des arrêtes inférieures est appelée lignes de cotes. De ce qui précède, on comprend que parmi les différentes caractéristiques qui constituent un ski, la géométrie des lignes de cotes joue un rôle déterminant dans le comportement du ski et en particulier, les lignes de cote définissent sur le type de pilotage que doit mettre en oeuvre le skieur. Les carres sont en particulier définies comme étant les arêtes inférieures du ski qui sont situées entre la zone la plus large du ski située à l'avant du ski et celle située à l'arrière.A pair of alpine skis consists of two boards that are substantially identical or at least symmetrical with respect to one another. One of the basic techniques of skiing requires that to go in a straight line, the user maintains his body in a plane perpendicular to the ground while when he wants to turn, he tilts his body towards the inside of the turn. This has a direct consequence on the positioning of the skis in relation to the terrain. When he goes straight, the skis are flat on the ground, they rest on their lower surface of sliding, called sole. When turning, the user gives his skis an inclination to the ground. It is then the lower edges, commonly called the edges, which come into contact with the ground. In top view, the outline of the lower edges is called dimension lines. From the foregoing, it is understood that among the various characteristics that constitute a ski, the geometry of the dimension lines plays a determining role in the behavior of the ski and in particular, the dimension lines define the type of steering that must be put in place. the skier. The edges are in particular defined as the lower edges of the ski which are located between the widest area of the ski located at the front of the ski and that located at the rear.

La fabrication des skis alpins, leur dimensionnement géométrique et structurel ont évolués depuis les débuts de cette pratique sportive. Les évolutions ont parfois été guidées par l'évolution des pratiques ou par celle des procédés de fabrication.The manufacture of alpine skis, their geometric and structural dimensioning have evolved since the beginning of this sporting practice. Evolutions have sometimes been guided by the evolution of practices or by that of manufacturing processes.

Les skis vendus jusque dans les années 1980 étalent relativement longs et droits et peu larges. Les lignes de cotes avalent des rayons très Importants, couramment supérieurs à 30 m. Dans ces skis, la largeur maximale dans la partie avant et la largeur maximale dans la partie arrière avaient sensiblement les mêmes valeurs. D'autre part, la zone de largeur minimale du ski, appelée également point étroit, se trouve au milieu du ski, au niveau de la zone de fixation des chaussures. Ces skis étaient performants pour la pratique sur les pistes de l'époque et surtout ils étaient adaptés aux techniques de ski utilisées à l'époque. Chaque virage nécessitait que le skieur allège la pression qu'il exerce sur les skis pour pouvoir les faire tourner. Ces skis restent, dans une certaine mesure, encore bien adaptés pour skier à grande vitesse, en ligne droite et sur piste. En marge des formes de skis principalement vendus jusque dans les années 1980, certains inventeurs Indépendants ont pu proposer des formes différentes qui n'ont pas donné satisfaction. Un exemple de ces formes différentes est donné dans le fascicule du brevet CH 503 601 . Dans ce document, on explique que la réduction de largeur de la partie talon, jusque à une valeur de 5cm, est compensée par l'élargissement d'une gorge dans la semelle. Une telle géométrie n'est pas polyvalente, notamment du fait de la faible largeur au niveau du talon. De plus, la réalisation d'une gorge de largeur variable rendrait le ski particulièrement coûteux à manufacturer.Skis sold until the 1980s are relatively long and straight and narrow. The dimension lines swallow very important rays, commonly greater than 30 m. In these skis, the maximum width in the front portion and the maximum width in the rear portion had substantially the same values. On the other hand, the zone of minimum width of the ski, also called narrow point, is in the middle of the ski, at the level of the fastening zone of the shoes. These skis were good for practice on the slopes of the time and especially they were adapted to the ski techniques used at the time. Each turn required that the skier reduce the pressure he exerts on the skis to be able to turn them. These skis remain, to some extent, still well suited for skiing at high speed, in a straight line and on track. In addition to the ski forms mainly sold until the 1980s, some independent inventors have been able to propose different forms that have not been satisfactory. An example of these different forms is given in the patent specification CH 503 601 . In this document it is explained that the reduction of the width of the Heel part, up to a value of 5cm, is offset by the widening of a groove in the sole. Such a geometry is not versatile, especially because of the small width at the heel. In addition, the creation of a groove of variable width would make the ski particularly expensive to manufacture.

Au tout début des années 1990, le document DE 41 12 950 proposait une forme de ski nouvelle ayant pour objectif d'améliorer le comportement en virage et de rendre plus rapide les changements de direction. Cette forme de ski se caractérise en ce que la portion concave est réduite en longueur et présente un rayon réduit par rapport à ce qui se faisait à l'époque. Cette portion concave est longitudinalement sensiblement centrée sur le milieu du ski. En deçà et au-delà de cette portion concave réduite, les lignes de cotes du ski sont constituées par des portions rectilignes. Ces portions rectilignes de ligne de cote dont la longueur est comprise entre 10 et 20 cm assurent la jonction entre la portion concave et d'une part, la spatule et d'autre part le talon. Une telle géométrie donne un ski dont l'aptitude au virage peut être améliorée mais dont le comportement n'est pas fluide.In the early 1990s, the document DE 41 12 950 proposed a new form of ski with the aim of improving cornering behavior and making changes of direction faster. This form of ski is characterized in that the concave portion is reduced in length and has a reduced radius compared to what was done at the time. This concave portion is longitudinally substantially centered on the middle of the ski. Beyond and beyond this reduced concave portion, the ski's dimension lines are constituted by rectilinear portions. These rectilinear portions of dimension line whose length is between 10 and 20 cm ensure the junction between the concave portion and on the one hand, the spatula and on the other hand the heel. Such a geometry gives a ski whose turnability can be improved but whose behavior is not fluid.

A partir des années 1990, les lignes de cote se sont creusées, les rayons ont diminué, La technique de ski s'est également modifié jusqu'à réduire, voire supprimer, l'allègement lors du virage. Ces skis sont particulièrement adaptés à la pratique sur piste damée. Un tel ski est, par exemple, décrit dans la demande de brevet EP 579 865 . Dans ce document, on décrit un ski dont la largeur minimale du ski se trouve au niveau des fixations dans la partie centrale du ski, et vaut 63 mm tandis que les largeurs à la spatule, la partie avant du ski, et au talon, sa partie arrière, valent respectivement 110 mm et 100 mm. Des skis de ce genre ont permis d'aborder une nouvelle pratique de ski, le "carving", c'est-à-dire la pratique des virages coupés. Pour favoriser le "carving", Il est important d'avoir des lignes de cotes très creusées, et par conséquent des rayons plus petits. Lorsque ces skis sont apparus sur le marché, on a parlé de skis paraboliques parce que la géométrie de leur ligne de cote rappelait un profil de parabole, La largeur maximale au niveau de la spatule et celle au niveau du talon étaient relativement importantes et sensiblement les mêmes, à 10 ou 20 mm près comme dans l'exemple plus haut, tandis que la largeur minimale au niveau de la partie centrale était beaucoup plus petite. Les skis actuels sont majoritairement basés sur ce genre de géométrie. Les skis à lignes de cote très creusée offrent un comportement satisfaisant sur piste mais un comportement très mauvais hors-piste. En effet, les lignes de cote à rayons très court ont pour conséquence que le ski s'engage trop facilement dans les courbes dans une neige molle. Il est ainsi très difficile de skier en ligne droite.From the 1990s, the side lines were widened, the rays decreased, The ski technique has also changed to reduce or eliminate the lightening during the turn. These skis are particularly adapted to the practice on groomed track. Such a ski is, for example, described in the patent application EP 579 865 . In this document, there is described a ski whose minimum width of the ski is at the fastenings in the central part of the ski, and is 63 mm while the widths at the spatula, the front part of the ski, and at the heel, its rear part, are respectively 110 mm and 100 mm. Skis of this kind made it possible to approach a new practice of skiing, the "carving", that is to say the practice of cut corners. To favor the "carving", it is important to have very hollow lines of dimensions, and consequently smaller rays. When these skis appeared on the market, we spoke about parabolic skis because the geometry of their side line recalled a parabola profile, the maximum width at the spatula and that at the heel were relatively large and substantially same, to 10 or 20 mm as in the example above, while the minimum width at the central part was much smaller. Current skis are mostly based on this kind of geometry. The skis with very deep side lines offer satisfactory behavior on the track but a very bad off-piste behavior. In fact, the very short radius side lines have the consequence that the ski engages too easily in the curves in a soft snow. It is very difficult to ski in a straight line.

On a vu également les skis se raccourcir et s'épaissir comme cela est montré dans le fascicule de brevet US 6 603 522 . Dans cette publication, on décrit des skis de longueur inférieure à 1730 mm, dont la spatule a une largeur comprise entre 110 et 120 mm pour un patin de largeur comprise entre 82 à 99 et un talon de largeur comprise entre 105 et 115 mm, l'écart entre la largeur de la spatule et celle du talon devant se maintenir entre 4 et 12 mm. L'objectif qui avait conduit à la réalisation de tels skis était d'optimiser la rigidité en torsion en combinant une relativement grande largeur à une relativement petite longueur. Ce parti-pris a pour conséquence que ces skis ne sont pas très polyvalents. Il est difficile de concevoir un ski ayant cette géométrie qui aura un comportement optimal à la fois sur la piste et en hors-piste. Il est également difficile de concevoir un ski suivant cette géométrie qui puisse être adaptés à différents skieurs ayant des niveaux techniques ou d'engagement (débutants, loisir, compétition) différents. Le raccourcissement en longueur des skis ne remettait cependant pas en cause l'orientation qui avait été prise au cours des années 1990 pour les skis paraboliques. D'ailleurs, ces skis présentent toujours la caractéristique qui veut que la zone de largeur minimale du ski se trouve au centre du ski, au niveau du milieu de la chaussure de ski.We have also seen the skis shorten and thicken as shown in the patent specification US 6,603,522 . In this publication, skis of length less than 1730 mm are described, the spatula of which has a width of 110 and 120 mm for a pad having a width of between 82 and 99 and a heel of width of between 105 and 115 mm, the difference between the width of the spatula and that of the heel being maintained between 4 and 12 mm. The objective that had led to the realization of such skis was to optimize the torsional stiffness by combining a relatively large width with a relatively small length. This bias means that these skis are not very versatile. It is difficult to design a ski with this geometry that will have an optimal behavior both on the track and off-piste. It is also difficult to design a ski according to this geometry that can be adapted to different skiers with different technical levels or commitment (beginners, leisure, competition). The shortening of the length of the skis did not, however, call into question the orientation that had been taken during the 1990s for parabolic skis. Moreover, these skis always have the characteristic that the area of minimum width of the ski is in the center of the ski, at the middle of the ski boot.

Depuis les années 2000, la pratique "freeride", essentiellement pratique hors-piste en neige vierge, se développe et des skis spécifiques ont été mis au point par les fabricants. Ces ski sont très larges et ont des largeurs patin qui peuvent atteindre 140 mm. Ces skis sont ne sont bien entendu pas du tout polyvalents, ils se révèlent très difficiles à manoeuvrer sur piste et sont réservés à des skieurs expérimentés. En effet une très grande largeur au niveau de la partie centrale rend le pilotage sur piste exigent musculairement et quasiment impossible pour un skieur débutant ou ayant peu skié. De tels skis sont par exemple décrits dans la demande de brevet US 2008/0042400.Since the 2000s, the practice "freeride", essentially practical off-piste snow virgin, is developing and specific skis have been developed by manufacturers. These skis are very wide and have pad widths that can reach 140 mm. These skis are of course not at all versatile, they are very difficult to maneuver on the track and are reserved for experienced skiers. Indeed a very large width in the central part makes the control on track require muscular and almost impossible for a beginner skier or having skied little. Such skis are for example described in US patent application 2008/0042400.

Une des caractéristiques des skis prévus pour la pratique "freeride" est que leur spatule est sensiblement plus longue et plus large que celle des skis prévus pour la piste. Telle que définie dans la norme ISO 6289, la spatule d'un ski est la partie de celui-ci qui est recourbée vers le haut pour surmonter aisément les obstacles. Selon la norme, la longueur de la spatule est définie par la distance séparant la pointe du ski de la ligne de contact avant (la limite avant de la zone de contact de la face inférieure du ski sur une surface plane). On peut choisir de déterminer cette longueur en mesurant la projection sur une surface plane, c'est la longueur projetée, ou d'en mesurer la longueur nominale, c'est la longueur développée. Dans la suite de l'exposé, lorsqu'on parlera de longueur, il s'agira de longueur développée. D'autre part, pour des raisons pratiques on choisira dans la suite de l'exposé d'appeler longueur de spatule "Ls", la mesure prise entre l'extrémité du ski et la ligne de plus grande largeur de la spatule et non pas comme cela est prévu dans la norme la distance "extrémité - ligne de contact". La portion du ski qui est appelée "spatule" dans la norme ISO 6289 sera appelée la "zone relevée" du ski. Spatule et zone relevée se confondent plus ou moins suivant la distance existante entre la ligne de contact avant et la ligne de plus grande largeur.One of the characteristics of the skis provided for the practice "freeride" is that their spatula is significantly longer and wider than that of the skis provided for the track. As defined in ISO 6289, the tip of a ski is the part of the ski that is bent upward to easily overcome obstacles. According to the standard, the length of the spatula is defined by the distance separating the tip of the ski from the front contact line (the front limit of the contact zone of the lower face of the ski on a flat surface). We can choose to determine this length by measuring the projection on a flat surface, it is the projected length, or to measure the nominal length, it is the developed length. In the rest of the talk, when we talk about length, it will be developed length. On the other hand, for practical reasons we will choose in the rest of the presentation to call spatula length "Ls", the measurement taken between the end of the ski and the line of greater width of the spatula and not as is provided in the standard distance "end - line of contact". The portion of the ski that is called "spatula" in the ISO 6289 standard will be called the "raised area" of the ski. Spatula and area measured are more or less confused depending on the distance between the front contact line and the line of greater width.

Pour un ski destiné à la pratique hors-piste et en neige profonde, il semble intéressant d'avoir une spatule haute, longue et large. Pourtant ces caractéristiques constituent des inconvénients dès que le skieur souhaite utiliser son ski sur piste. En effet, avec de telles spatules, le ski voit son volume hors de neige augmenter ce qui va de paire avec une augmentation des risques de vibrations et de lourdeur du ski.For a ski intended for off-piste practice and deep snow, it seems interesting to have a spatula high, long and wide. However, these characteristics are disadvantages as soon as the skier wishes to use his ski on the track. Indeed, with such spatulas, the ski sees its volume out of snow increase which goes hand in hand with an increase in the risk of vibrations and heaviness of the ski.

L'objectif de l'invention est de fournir un ski alpin qui ait un comportement optimal à la fois sur piste et hors piste.The object of the invention is to provide an alpine ski that has optimal behavior both on and off piste.

L'objectif de l'invention est de fournir un ski qui offre à un skieur ayant peu de pratique et/ou une faible force musculaire la possibilité de skier en toutes circonstances, sur tout type de neige, sur piste ou en hors-piste.The objective of the invention is to provide a ski that offers a skier with little practice and / or low muscular strength the ability to ski in all circumstances, on any type of snow, on the piste or off-piste.

L'objectif de l'invention est de fournir une nouvelle famille de ski qui permette une nouvelle technique de la pratique du ski alpin.The objective of the invention is to provide a new ski family that allows a new technique of alpine skiing.

L'objectif de l'invention est également de fournir une nouvelle famille constituée d'une pluralité de paires de skis qui ont tous un comportement optimal sur piste et hors-piste mais qui se distinguent les uns des autres par une aptitude préférentielle sur piste ou en hors-piste.The object of the invention is also to provide a new family made up of a plurality of pairs of skis, all of which have optimal behavior on and off-piste but which are distinguished from each other by a preferential aptitude on the runway or off-piste.

L'objectif de l'invention est également de fournir un ski dont la géométrie combine les avantages des skis à lignes de cote creusées et ceux des skis à lignes de cote larges.The object of the invention is also to provide a ski whose geometry combines the advantages of skis with side lines dug and those of skis with wide side lines.

L'objectif de l'invention est également de fournir un ski qui dispose d'une spatule favorisant le comportement dans la neige poudreuse.The object of the invention is also to provide a ski which has a spatula promoting the behavior in the powder snow.

L'objectif de l'invention est également de fournir un ski dont l'extrémité avant ne vibre pas au cours de son utilisation sur piste.The object of the invention is also to provide a ski whose front end does not vibrate during its use on the track.

L'objectif de l'invention est de fournir un ski qui offre un comportement résolument nouveau en ce que la partie avant du ski (celle située en avant de la chaussure de ski) et la partie arrière de celui-ci (celle située en arrière de la chaussure) offrent chacune un comportement différent.The objective of the invention is to provide a ski that offers a resolutely new behavior in that the front part of the ski (the one located in front of the ski boot) and the rear part of it (the one located behind of the shoe) each offer a different behavior.

L'objectif de l'invention est atteint par la fourniture d'un ski prévu pour la pratique du ski alpin comportant une partie avant, une partie arrière et une partie centrale, prévue pour recevoir des moyens de fixation d'une chaussure, qui s'intercale entre la partie avant et la partie arrière; ski dans lequel la partie avant comporte une portion de plus grande largeur de valeur "S", laquelle est comprise entre 135 mm et 165 mm, et dans lequel la différence "Δt" (delta-t) entre la valeur "S" de la largeur maximale de la partie avant et la valeur "T" de la largeur maximale de la partie arrière (T) est supérieure à 25 mm.The object of the invention is achieved by the provision of a ski provided for the practice of alpine skiing comprising a front portion, a rear portion and a central portion, adapted to receive shoe attachment means, which are interleaves between the front part and the rear part; ski in which the front portion comprises a portion of greater width of value "S", which is between 135 mm and 165 mm, and wherein the difference "Δt" (delta-t) between the value "S" of the maximum width of the front part and the value "T" of the maximum width of the rear part (T) is greater than 25 mm.

Selon des aspects avantageux mais non obligatoires de l'invention, un ski selon l'invention comporte une partie avant, une partie arrière et une partie centrale, et peut incorporer une ou plusieurs des caractéristiques techniques suivantes, prises dans toute combinaison techniquement admissible:

  • la partie arrière comporte une portion de plus grande largeur de valeur "T", comprise entre 90 mm et 130 mm.
  • la partie centrale comportant une portion de plus faible largeur de valeur "C", laquelle étant comprise entre 60 mm et 130 mm.
  • la différence "Δt" (delta-t) entre la valeur "S" et la valeur "T" est de préférence comprise entre 32 mm et 55 mm.
  • la valeur "S" est comprise entre 140 et 160.
  • la spatule a une longueur "Ls" comprise entre 150 et 320 mm, de préférence comprise entre 160 et 300 mm.
  • la valeur "P" correspondant à largeur du ski mesurée à une distance de 30 mm de l'extrémité avant du ski est inférieure à 60 % de la valeur de la largeur maximale de la partie avant: P < 0,6 x S, de préférence inférieure à 50 % de la valeur de la largeur maximale de la partie avant: P < 0,5 x S,
  • la distance séparant la ligne de milieu de chaussure, MC, de la ligne de plus faible largeur C est supérieure à 150 mm, de préférence supérieure à 180 mm,
  • la distance LB séparant la ligne de plus faible largeur C de la ligne de plus grande largeur de la partie arrière, T, est nulle.
According to advantageous but non-compulsory aspects of the invention, a ski according to the invention comprises a front part, a rear part and a central part, and may incorporate one or more of the following technical characteristics, taken in any technically permissible combination:
  • the rear portion has a portion of greater width of value "T", between 90 mm and 130 mm.
  • the central portion having a portion of smaller width of value "C", which is between 60 mm and 130 mm.
  • the difference "Δt" (delta-t) between the value "S" and the value "T" is preferably between 32 mm and 55 mm.
  • the value "S" is between 140 and 160.
  • the spatula has a length "Ls" of between 150 and 320 mm, preferably between 160 and 300 mm.
  • the value "P" corresponding to the width of the ski measured at a distance of 30 mm from the front end of the ski is less than 60% of the value of the maximum width of the front part: P <0.6 x S, from preferably less than 50% of the value of the maximum width of the front part: P <0.5 x S,
  • the distance separating the mid-shoe line, MC, from the line of smaller width C is greater than 150 mm, preferably greater than 180 mm,
  • the distance LB separating the line of smaller width C from the line of greater width of the rear part, T, is zero.

D'autres caractéristiques et avantages de l'invention seront mieux compris à l'aide de la description qui va suivre, en regard des dessins annexés illustrant, de façon non limitative, comment l'invention peut être réalisée, et dans lesquels :

  • La figure 1 est une vue de dessus d'un ski selon un premier mode de réalisation de l'invention.
  • Les figures 1a et 1b sont des vues de détail de la figure 1.
  • La figure 2 est une vue de coté du ski présenté à la figure 1.
  • La figure 2a est une vue de détail de la figure 2.
  • La figure 3 est une vue de dessus d'un ski selon un deuxième mode de réalisation de l'invention.
  • La figure 3a est une vue de détail de la figure 3.
  • La figure 4 est une vue de dessus d'un ski selon un troisième mode de réalisation de l'invention.
  • La figure 5 est une vue de dessus d'un ski selon un quatrième mode de réalisation de l'invention.
  • La figure 6 est une vue de dessus d'un ski selon un cinquième mode de réalisation de l'invention.
  • La figure 7 est une vue de dessus d'un ski selon un sixième mode de réalisation de l'invention.
Other features and advantages of the invention will be better understood with the aid of the following description, with reference to the appended drawings illustrating, in a non-limiting manner, how the invention may be implemented, and in which:
  • The figure 1 is a top view of a ski according to a first embodiment of the invention.
  • The figures 1a and 1b are detailed views of the figure 1 .
  • The figure 2 is a side view of the ski presented to the figure 1 .
  • The figure 2a is a detail view of the figure 2 .
  • The figure 3 is a top view of a ski according to a second embodiment of the invention.
  • The figure 3a is a detail view of the figure 3 .
  • The figure 4 is a top view of a ski according to a third embodiment of the invention.
  • The figure 5 is a top view of a ski according to a fourth embodiment of the invention.
  • The figure 6 is a top view of a ski according to a fifth embodiment of the invention.
  • The figure 7 is a top view of a ski according to a sixth embodiment of the invention.

La figure 1 décrit en vue de dessus un seul des skis d'une paire de ski destinée à la pratique du ski alpin.The figure 1 described in plan view only one of the skis of a pair of skis for the practice of alpine skiing.

De façon connue, ce ski comprend une semelle de glisse prévue pour être au contact avec la neige, une structure intérieure et un dessus. Comme on pourra le voir ci-dessous, le ski de la figure 1 se caractérise par des lignes de cote résolument nouvelles.In known manner, this ski comprises a gliding sole intended to be in contact with the snow, an inner structure and a top. As we can see below, the ski of the figure 1 is characterized by resolutely new dimension lines.

La partie centrale 4 du ski reçoit les fixations de sécurité 5 qui maintiennent la chaussure de ski de l'utilisateur (non représentée). La plus petite largeur de la partie centrale 4, appelée patin, a une valeur C égale à 88 mm. Il s'agit d'une valeur relativement large comparée aux skis tels qu'ils étaient conçus jusqu'au début des années 1990. On n'atteint cependant pas les largeurs qui sont celles des skis actuellement préconisés par les skis de poudreuse. Une telle largeur comprise entre 60 et 120, de préférence 70-100 donne au ski une grande polyvalence d'utilisation et le rend accessible à un plus grand nombre d'utilisateurs, depuis les débutants jusqu'aux skieurs confirmés.The central portion 4 of the ski receives the safety fasteners 5 which hold the ski boot of the user (not shown). The smallest width of the central portion 4, called shoe, has a value C equal to 88 mm. This is a relatively broad value compared to skis as they were designed until the early 1990s. However, the widths of skis currently recommended by powder skis are not achieved. Such a width between 60 and 120, preferably 70-100 gives the ski a great versatility of use and makes it accessible to a greater number of users, from beginners to advanced skiers.

La figure 1b, montre une vue de dessus en détail de la partie centrale du ski. On peut y voir le positionnement respectif des deux lignes caractéristiques de la partie centrale du ski : le milieu de chaussure et le point étroit. La ligne de milieu de chaussure est un marquage porté sur le ski par le fabricant et qui indique le positionnement préconisé des fixations de ski de telle manière que la chaussure, une fois fixée sur le ski, se trouve centrée sur cette ligne de milieu de chaussure. A la différence des skis de l'art antérieur, la ligne où se trouve la plus petite largeur de la partie centrale, appelée communément le point étroit du ski est reculée par rapport à la ligne du milieu de chaussure (MC) d'une valeur supérieure à 150 mm. Dans le ski décrit à la figure 1, la distance LC séparant le point étroit et le milieu de chaussure vaut 271 mm.The figure 1b , shows a top view in detail of the central part of the ski. We can see the respective positioning of the two characteristic lines of the central part of the ski: the middle of the shoe and the narrow point. The middle shoe line is a marking worn on the ski by the manufacturer and which indicates the recommended positioning of the ski bindings so that the shoe, once attached to the ski, is centered on this line of the middle of the shoe. . Unlike the skis of the prior art, the line where is the smallest width of the central part, commonly called the narrow point of the ski is moved back relative to the line of the middle of shoe (MC) a value greater than 150 mm. In the ski described at figure 1 , the distance LC separating the narrow point and the middle of the shoe is 271 mm.

La partie arrière 3 du ski, appelée talon, a une zone de plus grande largeur de valeur T comprise entre 90 et 110 mm. Une telle largeur permet une prise d'appui relativement facile en fin de virage, sans qu'il soit besoin de prendre des appuis très forts sur les carres. Dans l'exemple représenté à la figure 1, la valeur T vaut 100 mm.The rear part 3 of the ski, called the heel, has a zone of greater width of value T between 90 and 110 mm. Such a width allows a relatively easy support at the end of the turn, without the need to take very strong support on the edges. In the example shown in figure 1 , the value T is 100 mm.

La talon décrit à la figure 1 est un talon ayant une forme pointue. Il ne s'agit là que d'une des multiples formes que peut prendre le talon, cette forme n'étant pas limitative dans le cadre de l'invention.The heel described at figure 1 is a heel with a pointed shape. This is only one of the many forms that can take the heel, this form is not limiting in the context of the invention.

Conformément à l'invention, la partie avant comporte une partie avant 2, dont la largeur maximale, la valeur S, est largement supérieure à la largeur maximale de la partie talon.According to the invention, the front portion has a front portion 2, the maximum width, the value S, is much greater than the maximum width of the heel portion.

Les essais de différentes géométries de lignes de cote ont pu montrer que pour obtenir les effets recherchés par l'invention, if est préférable que la différence "Δt" (delta-t) entre la valeur "S" de la largeur maximale de la partie avant 2 et la valeur "T" de la largeur maximale de la partie arrière 3 soit supérieure à 25 mm. On a également pu mettre en évidence que ces effets sont amplifiés au point de marquer une différence de comportement significative avec les skis connus dans l'art antérieur, dès que la valeur delta "Δt" est supérieure à 32 mm. En effet, avec une valeur "Δt" égale ou supérieure à 32 mm, la différence de comportement générée par la géométrie de la partie avant et la partie arrière du ski devient plus significative. Pour des raisons de poids et d'encombrement on choisira de limiter la longueur de la spatule à une valeur de 190 mm. De préférence, on choisira, d'autre part, de limiter la largeur maximale de la spatule "S" en fonction de la largeur de la partie arrière "T" de telle façon que la valeur "Δt" (delta-t) reste inférieure à 60 mm, de préférence inférieure à 55 mm.The tests of different geometries of dimension lines could show that to obtain the effects sought by the invention, it is preferable that the difference "Δt" (delta-t) between the value "S" of the maximum width of the front portion 2 and the value "T" of the maximum width of the rear portion 3 is greater than 25 mm. It has also been possible to demonstrate that these effects are amplified to the point of marking a significant difference in behavior with the skis known in the prior art, as soon as the delta "Δt" value is greater than 32 mm. Indeed, with a value "Δt" equal to or greater than 32 mm, the difference in behavior generated by the geometry of the front portion and the rear portion of the ski becomes more significant. For reasons of weight and bulk we will choose to limit the length of the spatula to a value of 190 mm. Preferably, it will be chosen, on the other hand, to limit the maximum width of the spatula "S" as a function of the width of the rear part "T" so that the value "Δt" (delta-t) remains lower. at 60 mm, preferably less than 55 mm.

Dans le cas d'espèce présenté à la figure 1, la partie avant 2 a une largeur maximale "S" qui est égale à 150 mm, on dispose d'une différence "Δt" égale à 50 mm.In the case presented to the figure 1 , the front portion 2 has a maximum width "S" which is equal to 150 mm, there is a difference "Δt" equal to 50 mm.

Le ski décrit à la figure 1 présente donc une spatule de très grande largeur, c'est-à-dire une largeur qui est du même ordre que les largeurs de spatules de skis actuellement connus mais qui sont exclusivement prévus pour une utilisation "Freeride". D'ailleurs, les skis "freeride" actuels sont beaucoup trop larges pour offrir un pilotage aisé sur piste damée. Grâce à sa spatule large, le ski 1 bénéficie d'un bon comportement en neige profonde. De plus, son pilotage sur piste est beaucoup plus aisé que celui d'un ski de type "Freeride". On dispose là d'un ski particulièrement polyvalent dont le comportement sur piste comme en hors-piste est optimisé, notamment du fait d'une largeur minimale de la partie centrale égale à 88 mm.The ski described at figure 1 therefore has a spatula of very large width, that is to say a width which is of the same order as the widths of skate spatula currently known but which are exclusively intended for use "Freeride". Moreover, the current "freeride" skis are much too wide to offer easy driving on a groomed track. Thanks to its wide spatula, the ski 1 enjoys a good behavior in deep snow. In addition, its driving on the track is much easier than that of a ski type "Freeride". This is a particularly versatile ski whose track behavior as off-piste is optimized, especially because of a minimum width of the central portion equal to 88 mm.

De préférence, dans un ski polyvalent tel que le ski décrit à la figure 1, on cherchera à limiter le volume hors de neige tout en gardant une spatule suffisamment longue. Pour ce faire, on privilégiera les spatules pointues et dont la ligne de plus grande largeur au niveau de la partie avant se trouve à une hauteur relativement faible comme on pourra le voir un peu plus en avant dans le texte.Preferably, in a multi-purpose ski such as the ski described in figure 1 we will try to limit the volume out of snow while keeping a sufficiently long spatula. To do this, we will favor pointed spatulas and the line of greater width at the front is at a relatively low height as can be seen a little further in the text.

La figure 1a montre le caractère "pointu" du contour de la partie avant 2 du ski 1. Ce caractère pointu est mis en évidence par la mesure de la largeur du ski à proximité de l'extrémité avant du ski, la pointe 6. Cette mesure, qu'on nommera "P" est réalisée à une distance de 30 mm (longueur développée) de la pointe 6 du ski 1. Dans le cas d'espèce, la valeur de P est 55 mm.The figure 1a shows the "sharp" character of the outline of the front portion 2 of the ski 1. This sharp character is highlighted by measuring the width of the ski near the front end of the ski, the tip 6. This measurement, which 'P' is made at a distance of 30 mm (developed length) from the point 6 of the ski 1. In the case in point, the value of P is 55 mm.

On considère que la spatule a un contour pointue dans la mesure où la valeur "P" est inférieure ou égale à la moitié (50 %) de la largeur maximale de la partie avant 2, la valeur "S" (P ≤ 0,5 x S).It is considered that the spatula has a pointed contour insofar as the value "P" is less than or equal to half (50%) of the maximum width of the front part 2, the value "S" (P ≤ 0.5 x S).

De préférence une spatule pointue est relativement longue. Dans le cadre de l'invention, on choisira une spatule dont la longueur "Ls" est supérieure à 150 mm, les skis selon l'invention ayant les meilleures performances sont ceux qui ont une longueur de spatule comprise entre 150 et 320 mm.Preferably a pointed spatula is relatively long. In the context of the invention, one will choose a spatula whose length "Ls" is greater than 150 mm, the skis according to the invention having the best performance are those which have a spatula length of between 150 and 320 mm.

Pour améliorer la polyvalence du comportement des skis selon l'invention, on utilisera des spatules pointues (P ≤ 0,5 x S). Il faut cependant noter que des skis selon l'invention dont les spatules sont moyennement pointues, c'est-à-dire ayant une valeur "P" inférieure ou égale à 60 % de la valeur "S", donnent des résultats satisfaisants. D'autre part, on pourra également envisager des skis conformes à l'invention disposant de spatules rondes.To improve the versatility of the behavior of the skis according to the invention, sharp spatulas (P ≤ 0.5 x S) will be used. It should however be noted that skis according to the invention whose spatulas are moderately pointed, that is to say having a value "P" less than or equal to 60% of the value "S", give satisfactory results. On the other hand, we can also consider skis according to the invention having round spatulas.

La figure 2 montre en vue de côté le ski 1 de la figure 1. Le ski repose sur une surface plane 9 au niveau de deux lignes; la ligne de contact avant 7 et la ligne de contact arrière 8. La longueur de la spatule "Ls", mesurée entre la ligne de plus grande largeur et la pointe 6 du ski est égale à 256 mm.The figure 2 shows in side view the ski 1 of the figure 1 . The ski rests on a flat surface 9 at the level of two lines; the front contact line 7 and the rear contact line 8. The length of the spatula "Ls", measured between the line of greater width and the tip 6 of the ski is equal to 256 mm.

La ligne de contact avant se situe à proximité de la ligne 10 de plus grande largeur de la spatule du ski. Comme on peut le voir sur la figure 2a, cette proximité se traduit par le fait que, au niveau de la ligne de plus grande largeur, la semelle du ski se trouve à une hauteur "Hs", de préférence, inférieure à 10 mm.The front contact line is located near the line 10 of greater width of the spatula of the ski. As can be seen on the figure 2a this proximity is reflected by the fact that, at the level of the line of greater width, the sole of the ski is at a height "Hs", preferably less than 10 mm.

Le ski décrit à la figure 1 est un ski dont la longueur totale est égale à 1900 mm. Bien entendu, ceci n'est nullement une limitation de l'invention et on pourra aisément décliner la géométrie particulière de l'invention pour des skis plus longs ou plus courts.The ski described at figure 1 is a ski whose total length is equal to 1900 mm. Of course, this is not a limitation of the invention, and the particular geometry of the invention can be easily adapted for longer or shorter skis.

La figure 3 représente un deuxième mode de réalisation de l'invention. Comme dans le mode de réalisation décrit précédemment, il s'agit d'un ski conçu pour une utilisation polyvalente piste et hors-piste avec une légère prédisposition pour le ski carving et l'utilisation dans la neige fraiche. Au niveau de la partie arrière, la plus grande largeur du ski, la valeur "T", vaut 105 mm, la largeur minimale de la partie centrale 4, la valeur "C", vaut 80 mm et la plus grande largeur de la spatule, la valeur "S", vaut 140 mm.The figure 3 represents a second embodiment of the invention. As in the embodiment described above, it is a ski designed for versatile use track and off-track with a slight predisposition for carving skiing and use in the fresh snow. At the rear, the widest ski width, the value "T", is 105 mm, the minimum width of the central part 4, the value "C" is 80 mm and the largest width of the spatula the value "S" is 140 mm.

On dispose donc d'un ski dont les lignes de cotes sont assez creusées, le rayon de la ligne de cote valant environ 11 m. La différence entre la largeur spatule et la largeur talon, la valeur "Δt", vaut 35 mm.We therefore have a ski whose side lines are quite hollow, the radius of the side line is about 11 m. The difference between the spatula width and the heel width, the value "Δt", is 35 mm.

La spatule est très longue, la valeur "Ls" vaut 300 mm, et très pointue, la valeur "P" valant 42 mm, ce qui correspond à 30% de la plus grande largeur de spatule.The spatula is very long, the value "Ls" is 300 mm, and very pointed, the value "P" is 42 mm, which corresponds to 30% of the largest width of spatula.

La figure 3a est une vue de détail du ski décrit à la figure 3 qui permet de visualiser la relation entre les différentes lignes caractéristiques de la demi-longueur arrière du ski. La ligne de milieu de chaussure, MC, est placée à une distance LA de la ligne de plus grande largeur talon, T. De manière classique la longueur LA correspond à un certain pourcentage de la longueur totale de la ligne de cote. La ligne de plus petite largeur du ski dans la partie centrale, appelée également le point étroit, et noté C sur la figure est située entre les lignes MC et T. Conformément à l'invention, la distance LC séparant les lignes C et MC est supérieure à 150 mm. C'est-à-dire que le point étroit se trouve en arrière de la chaussure lorsque celle-ci est fixée sur le ski.The figure 3a is a detailed view of the ski described in figure 3 which makes it possible to visualize the relation between the different characteristic lines of the half-length back of the ski. The middle shoe line, MC, is placed at a distance LA from the line of greater width heel, T. Conventionally the length LA corresponds to a certain percentage of the total length of the dimension line. The line of smaller ski width in the central part, also called the narrow point, and noted C in the figure is located between the lines MC and T. According to the invention, the distance LC separating the lines C and MC is greater at 150 mm. That is to say, the narrow point is behind the shoe when it is fixed on the ski.

La figure 4 représente un troisième mode de réalisation de l'invention pour lequel les valeurs S, C et T valent respectivement 160, 103 et 117 mm. La spatule est relativement longue, la valeur "Ls" valant 300 mm. Il s'agit là d'un ski particulièrement adapté pour une pratique hors-piste. Il s'agit d'un ski typé "freeride" pour reprendre l'une des catégories actuellement utilisées par les constructeurs pour segmenter leur offre produits.The figure 4 represents a third embodiment of the invention for which the values S, C and T are respectively 160, 103 and 117 mm. The spatula is relatively long, the value "Ls" worth 300 mm. This is a particularly suitable ski for off-piste practice. It is a freeride type ski to use one of the categories currently used by manufacturers to segment their product offering.

Cependant du fait d'une différence entre la largeur de la spatule et celle du talon particulièrement importante, la valeur "Δt" valant 43 mm, on dispose d'un ski ayant une polyvalence notablement améliorée par rapport aux skis habituels de la catégorie "freeride".However, because of a difference between the width of the spatula and that of the heel particularly important, the value "Δt" of 43 mm, it has a ski with a significantly improved versatility compared to the usual skis in the category "freeride ".

La partie avant 2 est également caractérisée par son caractère "pointu". En effet la largeur "P" mesurée à une distance de 30 mm de la pointe 6 est égale à 53, c'est-à-dire correspondant à environ 34 % de la valeur de la largeur "S" de la spatuleThe front part 2 is also characterized by its "sharp" character. Indeed the width "P" measured at a distance of 30 mm from the tip 6 is equal to 53, that is to say corresponding to about 34% of the value of the width "S" of the spatula

La figure 5 représente un quatrième mode de réalisation de l'invention pour lequel les valeurs S, C et T valent respectivement 140, 68 et 90 mm. La spatule a une longueur, "Ls", de 190 mm et a une forme pointue avec une valeur "P" égale à 57 mm (40 % de la valeur S). Il s'agit là d'un ski particulièrement adapté pour une pratique sur piste.The figure 5 represents a fourth embodiment of the invention for which the values S, C and T are respectively 140, 68 and 90 mm. The spatula has a length, "Ls", of 190 mm and has a pointed shape with a value "P" equal to 57 mm (40% of the value S). This is a particularly suitable ski for track practice.

Cependant du fait d'une différence entre la largeur de la spatule et celle du talon particulièrement Importante, la valeur "Δt" valant 50 mm, on dispose d'un ski ayant une polyvalence notablement améliorée par rapport aux skis habituellement dimensionnée pour la piste. Notamment, avec un tel ski, l'utilisateur pourra changer occasionnellement de pratique et sortir de la piste. Un tel ski favorisera l'accès à la pratique "freeride" pour des skieurs débutants ou ayant peu d'expérience.However, because of a difference between the width of the spatula and that particularly important heel, the value "Δt" equal to 50 mm, there is a ski having a significantly improved versatility compared to skis usually sized for the track. In particular, with such a ski, the user can occasionally change the practice and get out of the track. Such a ski will promote access to freeride practice for beginners or inexperienced skiers.

Le tableau 1, ci-dessous récapitule les données géométriques d'une gamme complète de skis selon l'invention. Ces skis se caractérisent par une polyvalence améliorée par rapport aux skis connus jusqu'à présent, tout en ayant chacun un domaine de prédilection.Table 1 below summarizes the geometric data of a complete range of skis according to the invention. These skis are characterized by an improved versatility compared to the skis known until now, while each having a field of predilection.

La gamme de ski présentée dans le tableau 1 comprend 18 skis ayant chacun une géométrie différente mais qui partagent tous les caractéristiques novatrices de l'invention. On notera que la longueur totale des skis n'est pas mentionnée dans ce tableau. Chacun des skis constituant cette gamme a été développé dans une longueur moyenne comprise entre 2000 et 1600 mm. Pour construire l'offre globale, le fabricant déclinera chacun des skis dans différentes tailles pour adapter chaque géométrie au poids et la taille des utilisateurs.The ski range presented in Table 1 comprises 18 skis each having a different geometry but which share all the innovative features of the invention. It should be noted that the total length of the skis is not mentioned in this table. Each of the skis constituting this range has been developed in an average length of between 2000 and 1600 mm. To build the global offer, the manufacturer will decline each ski in different sizes to fit each geometry to the weight and size of the users.

Les trois premiers skis du tableau, dont fait partie le ski représenté à la figure 5, constituent des skis qui donneront leurs meilleures performances sur piste du fait d'une largeur au patin relativement faible. Cependant, lorsque la skieur pratiquera le hors-piste avec un de ces skis, il bénéficiera d'une bonne portance grâce à une spatule longue et large. Dans le cas où, comme à la figure 5, le ski dispose d'une spatule pointue, ces skis seront parfaitement adaptés à la prise de vitesse et par exemple aux pratiques de compétition de "descente" et de "slalom géant".The first three skis on the board, including the ski represented in the figure 5 , are skis that will give their best performance on track due to a relatively small pad width. However, when the skier will practice off-piste with one of these skis, he will enjoy a good lift thanks to a long and wide spatula. In the case where, as in figure 5 , the ski has a pointed spatula, these skis will be perfectly adapted to the catch of speed and for example to the practices of competition of "descent" and "giant slalom".

Les huit skis constituants le bas du tableau sont conçus pour une utilisation principalement hors-piste. Cependant, grâce à une largeur minimale dans la partie centrale ne dépassant pas 130 mm, et de préférence, ne dépassant pas 120 mm, ces skis reste très facile à piloter sur piste. Sur piste, ces skis ne demanderont à l'utilisateur, pas plus d'effort de pilotage que des skis spécialement conçus pour une pratique sur piste. Ici aussi, le choix d'une spatule pointue, comme pour le ski représenté à la figure 4 augmentera encore la polyvalence d'utilisation de ces skis.The eight skis at the bottom of the board are designed for predominantly off-piste use. However, thanks to a minimum width in the central portion not exceeding 130 mm, and preferably not exceeding 120 mm, these skis is very easy to fly on the track. On piste, these skis will not ask the user, no more driving effort than skis specially designed for track practice. Here too, the choice of a pointed spatula, as for the ski represented in the figure 4 will further increase the versatility of use of these skis.

Au milieu du tableau, huit skis, dont le ratio entre l'aptitude sur piste et l'aptitude hors-piste est compris entre 70/30 et 30/70 constituent les skis qui sont conçus pour la piste et le hors piste. Les skis représentés aux figures 1 et 3 sont des exemples de tels skis polyvalents.-

Figure imgb0001
In the middle of the table, eight skis, which are between 70/30 and 30/70 ratio of track suitability to off-road ability, are skis that are designed for the track and the off-piste. The skis represented at figures 1 and 3 are examples of such versatile skis.
Figure imgb0001

Comme on l'a vu un peu plus haut, un des aspects de l'invention est lié au fait que le point étroit est reculé par rapport au milieu de chaussure d'une valeur supérieure à 150 mm, de préférence supérieure à 180 mm. Le tableau -2- compile les valeurs de quatre géométries de ski différentes partageant une même largeur de spatule et de talon, mais dont le point étroit se trouve à des positions différentes. - Tableau 2 - S C T Δt LB LC 160 106 125 35 515 177 160 118 125 35 400 290 160 123 125 35 261 431 (figure 6) 160 125 125 35 0 692 (figure 7) As seen above, one aspect of the invention is related to the fact that the narrow point is retracted from the boot medium by more than 150 mm, preferably greater than 180 mm. Table -2- compiles the values of four different ski geometries sharing the same spatula and heel width, but whose narrow point is at different positions. - Table 2 - S VS T .delta.t LB LC 160 106 125 35 515 177 160 118 125 35 400 290 160 123 125 35 261 431 ( figure 6 ) 160 125 125 35 0 692 ( figure 7 )

Les deux premières lignes du tableau correspondent à des géométries de skis bien adaptées pour la pratique hors-piste, dont la position du point étroit par rapport au milieu de chaussure, respectivement à 177 et 290 mm font qu'il s'agit de géométries assurant une bonne mobilité directionnelle au ski.The first two lines of the table correspond to ski geometries well suited for off-piste practice, whose position of the narrow point with respect to the middle of the shoe, at 177 and 290 mm, respectively, make it possible to provide geometries which ensure good directional mobility to skiing.

La troisième ligne du tableau correspond à une géométrie dont un exemple de ski est décrit à la figure 6. Comme on peut le voir, la ligne du point étroit est très reculée. La distance séparant le point étroit de la ligne de plus grande largeur du talon correspond sensiblement au tiers (1/3) de la distance séparant la ligne de plus grande largeur du talon au milieu de chaussure. Le recul du point étroit améliore la stabilité du ski à vitesse élevée et du fait d'une différence de largeur spatule/talon égale à 35 mm, ce ski garde une bonne polyvalence.The third line of the table corresponds to a geometry of which an example of ski is described in figure 6 . As can be seen, the line of the narrow point is very remote. The distance separating the narrow point from the line of greater width of the heel corresponds substantially to one third (1/3) of the distance separating the line of greater width from the heel to the middle of the shoe. The narrow point retreat improves the stability of the ski at high speed and due to a difference in spatula / heel width equal to 35 mm, this ski retains good versatility.

La figure 7 montre un ski dont la différence spatule/talon est également égale à 35 mm, mais dont le point étroit est reculé au maximum, c'est-à-dire jusqu'au niveau du point large talon. Dans cette géométrie, la ligne de point étroit C et la ligne de plus grande largeur talon T se confondent. Les lignes de cotes complètes du ski rejoignent le point étroit C à la ligne de plus grande largeur spatule S. La ligne de cote est une ligne courbe dont le rayon de courbure moyen pourra être plus grand que celui des autres modes de réalisation de l'invention. Par exemple, le rayon moyen de la ligne de cote pourra dépasser 30 m, voire 50 m. On parle alors de ligne de cote tendue.The figure 7 shows a ski whose difference spatula / heel is also equal to 35 mm, but whose narrow point is moved back as far as possible, that is to say up to the level of the broad heel point. In this geometry, the narrow point line C and the line of greater width heel T merge. The complete dimension lines of the ski join the narrow point C to the line of greater width spatula S. The dimension line is a curved line whose average radius of curvature may be greater than that of the other embodiments of the invention. For example, the average radius of the dimension line may exceed 30 m or 50 m. This is called a stretched sideline.

Le ski représenté à la figure 7 offre une polyvalence des pratiques, notamment de la pratique freeride associée à une excellente stabilité directionnelle.The ski represented at figure 7 offers a versatility of practices, including freeride practice combined with excellent directional stability.

Il est un ski particulièrement adapté pour la nouvelle segmentation à voir le jour au sein des pratiques hors-piste, la pratique « Big mountain ». La pratique dite « Big mountain » consiste notamment à descendre à très grande vitesse des flancs de montagne très pentus et selon des trajectoires ayant des grands rayons de courbure.It is a particularly suitable ski for the new segmentation to emerge within the off-piste practices, the "Big Mountain" practice. The practice known as "Big Mountain" consists in particular of descending at very high speed mountain slopes very steep and in trajectories with large radii of curvature.

Bien entendu l'invention n'est pas limitée aux formes de réalisation qui viennent d'être décrites, mais à la portée des revendications qui vont suivre.Naturally, the invention is not limited to the embodiments that have just been described, but within the scope of the claims that follow.

Claims (12)

  1. Ski (1) intended for alpine skiing, comprising a front part (2), a rear part (3) and a central part (4) designed to receive attachment means (5) for a boot, and comprising a boot centre marking (MC) corresponding to the region around which it is expected that the ski bindings will be centred and which is interposed between the front part (2) and the rear part (3); characterized in that:
    - the front part (2) comprises a portion of greater width of value "S", which is between 135 mm and 165 mm, in that
    - the difference "Δt" (delta-t) between the value "S" of the greatest width of the front part and the value "T" of the maximum width of the rear part (3) is greater than 25 mm and in that the distance (LC) separating the line of smallest width of the central part (4) and the boot centre marking is greater than 150 mm.
  2. Ski according to Claim 1, characterized in that:
    - the rear part (3) comprises a portion of greater width of value "T", which is between 90 mm and 130 mm.
  3. Ski according to either of Claims 1 and 2, characterized in that a portion of smaller width of the central part (4) has a width of value "C" of between 60 mm and 130 mm.
  4. Ski according to one of Claims 1 to 3, characterized in that the difference "Δt" (delta-t) between the value "S" and the value "T" is greater than 32 mm.
  5. Ski according to one of Claims 1 to 4, characterized in that the difference between the value "S" and the value "T" is between 32 mm and 55 mm.
  6. Ski according to one of Claims 1 to 5, characterized in that the value "S" is between 140 mm and 160 mm.
  7. Ski according to one of Claims 1 to 6, characterized in that the distance (LC) is greater than 180 mm.
  8. Ski according to one of Claims 1 to 7, characterized in that the tip has a length "Ls" between 150 and 320 mm.
  9. Ski according to Claim 8, characterized in that the tip has a length "Ls" between 160 and 300 mm.
  10. Ski according to one of Claims 1 to 9, characterized in that the value "P" corresponding to the width of the ski measured at a distance of 30 mm from the front end of the ski is less than 60% of the value of the maximum width of the front part: P < 0.6 x S.
  11. Ski according to Claim 10, characterized in that the value "P" corresponding to the width of the ski measured at a distance of 30 mm from the front end of the ski is less than 50% of the value of the maximum width of the front part: P < 0.5 x S.
  12. Ski according to one of Claims 3 to 11, characterized in that the distance (LB) separating the portion of greater width of the rear part (3) and the portion of smaller width of the central part (4) is zero.
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FR3019055B1 (en) * 2014-03-25 2017-09-29 Eric Bobrowicz REINFORCEMENTS FOR LARGE SKIS
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