EP3842105A1 - Sliding board with unidirectional anti-slip system - Google Patents
Sliding board with unidirectional anti-slip system Download PDFInfo
- Publication number
- EP3842105A1 EP3842105A1 EP20213870.7A EP20213870A EP3842105A1 EP 3842105 A1 EP3842105 A1 EP 3842105A1 EP 20213870 A EP20213870 A EP 20213870A EP 3842105 A1 EP3842105 A1 EP 3842105A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ski
- resilient layer
- braking
- layer
- friction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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
- A63C5/056—Materials for the running sole
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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
- A63C5/0428—Other in-relief running soles
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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
- A63C7/00—Devices preventing skis from slipping back; Ski-stoppers or ski-brakes
- A63C7/02—Skins; Substitutes for skins
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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
- A63C7/00—Devices preventing skis from slipping back; Ski-stoppers or ski-brakes
- A63C7/06—Tooth-shaped running sole-plates
Definitions
- the present invention relates to a gliding board equipped with a braking device.
- the present invention relates to a cross-country ski equipped with anti-recoil means placed under a central portion thereof, at its sliding surface.
- anti-recoil means can take several forms. For example, they can consist of the placement of an anti-slip material called “wax” which is applied only in the central zone of the sole of the ski, commonly called “wax chamber”. These means may also consist of a strip providing uni-directional braking which is fixed under the gliding sole of the ski.
- the band consists of anti-recoil means associated with fixing means, the latter making it possible to keep the anti-recoil means in place under the sole of the ski.
- the fixing means generally consist of an adhesive but can also take the form of mechanical or magnetic means.
- the anti-recoil means are most often made of a pile, the projecting fibers of which are all oriented in such a way that in a first directional direction, they strongly restrict the sliding while in the directional direction opposite to the first direction, they do not. do not interfere or little.
- a cross-country ski has a camber such that, in the free state and up to a certain stress made in its center, the central portion of its sliding surface is not in contact with the snow.
- the value of the camber as well as the rigidity of the ski are normally adapted to the weight of the user in such a way that, during the progression of the skier, the transfer of his weight from one leg to the other has the effect of tackling against the snow the central portion of the ski of the support leg and move away from the snow the central portion of the other ski.
- camber of a cross-country ski is also chosen according to the practice. Indeed, cross-country skis dedicated to so-called “classic” practice have a much lower camber value than those dedicated to so-called “skating” practice.
- the high camber height of a skating ski makes it unusable for the practice of classic cross-country skiing because the braking means will remain too high in relation to the snow and their efficiency will be low.
- an adequate braking device for a cross-country ski, or for a ski touring involves determining and fixing a certain number of criteria.
- One of these criteria is the length, and to a lesser extent the width, of the braking device. Indeed, as the function of the latter is to increase friction, the greater its surface area, the greater the braking action will be.
- the braking device is too long, it remains in contact with the snow even when the ski is in the sliding phase, despite the camber raising which takes place as soon as the skier does not. is more fully in support. And then, the braking device interferes with the sliding phase and consequently reduces the performance of the ski and the skier.
- the braking devices in particular those constituted by a skin, must, in order to have satisfactory anti-kickback efficiency, a length corresponding to approximately 20% of the total length of the ski and in any event greater than 19% of this length.
- solutions of the prior art only offer unsatisfactory responses to the implementation of a ski braking device which resolves the difficult compromise between good efficiency of the anti-rollback function, towards the rear, and the minimization of the hindrance to the forward advance during the gliding phase.
- the solutions of the prior art do not allow the design of cross-country skis which can be used both for conventional practice and for skating practice.
- the objective of the invention is therefore to provide a braking device which improves the performance of the anti-recoil function during the stance phase, thus preventing the ski from sliding backwards and reducing the effect of hindrance. the advance of the ski during the gliding phase.
- a braking device for a ski comprising a first layer equipped with means for increasing friction, as well as a resilient or deformable layer, the unconstrained thickness of which is between 1 and 10 mm.
- the braking device makes it possible to improve the efficiency of the means which increase the friction during the recoil phases because they are allowed to deform in reaction to the sliding terrain.
- the braking device makes it possible to reduce their length and / or area. Consequently, it is not only the weight of the braking means that can be reduced, but also the negative effect they have during sliding phases.
- this improved efficiency of the braking means has an additional advantage over the design of the skis provided for cross-country skiing in its conventional practice. It becomes possible to use, for this practice, skis which have a camber value greater than that currently used. In certain cases even, it is possible to envisage using a ski, initially designed for “skating” practice, for “classic” practice, insofar as it is associated with a braking device according to the invention.
- the figure 1 shows a bottom view of a ski 1 equipped with a braking device 2 according to the invention.
- This is a cross-country ski designed for so-called “classic” practice, also called “alternative pitch technique”.
- the total length L1 of which is for example between 170 cm and 210 cm (adult ski)
- the braking device 2 is placed under the ski.
- the latter only occupies the central part of the ski.
- the sliding surface 11 of the ski over a length L2 which corresponds to approximately 16% of the length of the ski.
- the increased efficiency of the braking devices according to the invention to ensure anti-kickback allows a reduction in the length of the latter compared to the lengths of the devices of the prior art.
- the figure 2 shows ski 1 of the figure 1 in longitudinal section AA.
- it comprises a gliding sole 11 made from a layer of a material having good gliding properties on snow.
- the upper surface 12 of the ski is, for its part, constituted by a protective film 12 which can be decorated.
- Between the protective film 12 and the gliding sole 11 are interposed all the different components which, together, constitute a ski. These components include in particular upper and lower reinforcements, an intermediate core and possibly side edges.
- the ski 1 is also characterized by the fact that braking means can be attached to the gliding sole.
- these braking means are removably fixed in order to replace them, move them or else, as we will see later in the description, in order to be able to use the ski, without the braking means.
- a cavity 13 is formed in the central portion of the gliding sole 11 in order to receive, at least partially, the braking means.
- the cavity 13 has a contour of complementary shape to the outer contour of the braking means 2 so that the latter come to be housed precisely in the cavity 13.
- a shoe 3 is also drawn on the figure 2 in order to show the relative positioning of the braking means 2 with respect to the skier's foot.
- the braking means are more or less centered on the front portion 31 of the boot, itself placed at the level of the articulation zone of the ski binding (not shown).
- the figure 3 shows a cross section of the ski of the figure 1 according to plan BB.
- the braking means 2 which comprise a first layer 21 equipped with means for increasing the friction and a second layer 22 comprising a resilient material, are partially inserted into the cavity 13.
- the second resilient layer 22 is housed in the cavity, while the first layer 21 protrudes and projects out of the cavity.
- the resilient layer is intended to compress vertically. It has a stress-free thickness of between 1 and 10 mm and has a thickness under a stress of 1.4 kg / m 2 of between 0.5 and 3 mm. It can be produced in a thermoplastic foam with a density of between 10 and 60 kg / m 3 . Foams are preferably used whose compressive force is between 10 and 80 kPa.
- the figure 4 shows the operation of the ski 1 equipped with braking means according to the invention.
- the ski is placed on track 4.
- track 4 Although particular care is taken in preparing cross-country ski tracks, the surface of the latter is rarely strictly flat. There may in particular be many protuberances 41 more or less wide and / or long and oriented or not in the direction of travel of the skier. The presence of these breaks in the flatness of the track has negative effects on the capacity of the braking means 2 to remain in contact with the track as much as possible in order to ensure their anti-rollback function. This is particularly true for the devices of the prior art.
- the braking means 2 according to the invention cancel out these effects thanks to the presence of the resilient layer 22.
- the resilient layer 22 which can compress locally with regard to the breaks in the flatness of the track ensures that the first layer 21 which carries the means for increasing the friction remain always and everywhere in contact with the track.
- the anti-recoil forces are improved, even if the length L2 of the braking means is less than that of the means usually used in the prior art.
- a skin braking means which has a length of at least 20% of the total length of the ski.
- the figure 5 shows in section the braking means 2 according to the first embodiment of the invention.
- a first adhesive film 23 is interposed between the first layer 21 and the resilient layer 22. Its function is to hold together the two main components of the braking means.
- a second adhesive film 24 is placed on the resilient layer 22. Its function is to ensure the fixing of the braking means to the ski.
- the first layer 21 is in the first embodiment made up of a complex called “sealskin”.
- This is a base 211 from which project a multitude of wires 212 which are all oriented in the same direction, which direction forming an angle of between 10 ° and 80 ° with the direction perpendicular to the plane of the sliding surface of the ski.
- the braking means are fixed under the ski in such a way that the direction of inclination of the wires is opposite to the direction of advance A of the ski.
- the wires will have a tendency to flatten themselves substantially horizontally along the base 211. In doing so, they generate little friction and do not interfere with the sliding of the ski.
- the wires maintain, or even accentuate, their protruding position and therefore generate a significant frictional force. This is the anti-recoil function of the braking means.
- the resilient layer must be such as to allow deformation of the braking means with an amplitude guaranteeing good adaptability of the latter to the imperfections of the terrain.
- the resilient layer 22 has a thickness between 1 and 10 mm, and preferably between 2 and 8 mm.
- it is important that the resilient layer is not too soft or too firm. This is why, preference will be given to materials whose compressive force at 25% is between 10 and 80 kPa.
- Different types of foam can be used to make the resilient layer. For example, Polyurethane, Polyethylene, EVA, PLA (Polylactic Acid) foams, etc.
- foams for sealing reasons, we can select closed-cell foams, open-cell foams with a skin effect or any other foam sealed.
- a material of foam type for the resilient layer is not limiting. Indeed, it can, if necessary, be replaced by a deformable part, which is for example obtained by plastic injection or by 3D printing, or by a 3D textile, a gel pouch or a bladder filled with water. air or any other gaseous element.
- the resilient layer has a thickness of about 3 mm, a density of between 28 and 33 kg / m3 and a compressive force of 30 kPa.
- the figure 6 shows in section the braking means 2 'according to a first variant of the first embodiment.
- the resilient layer 22 ' is made of a material which, besides having mechanical characteristics similar to that of the material of the resilient layer described above, also has the ability to bond to the first layer 21 without it being necessary to use additional bonding means.
- the resilient layer 22 ′ can be cast or injected into a mold in which the first layer 21 will have been previously placed.
- the resilient layer 22 ′ is then overmolded or over-injected on the first layer 21.
- the figure 7a shows a resilient layer 22 "according to a second variant embodiment of the invention. Only the resilient layer 22" is shown here.
- the latter is in the form of a deformable plastic part which comprises a casing upper 221 "intended to be fixed to the lower surface of the ski, for example by means of an adhesive film.
- the resilient layer 22" also comprises a lower envelope 222 "on which is fixed the first layer of the braking means.
- the upper envelope 221 “and the lower envelope 222" are connected by a multitude of partitions 223 "oriented in the direction perpendicular to the longitudinal axis of the ski A. These partitions 223" are preferably substantially parallel to each other. others and preferably all form the same angle ⁇ with the horizontal plane.
- the angle ⁇ is acute with respect to the direction, M, corresponding to the advance of the ski in order to allow deformation of the layer resilient 22 ".
- the upper 221 “and lower 222" envelopes associated with the partitions 223 "constitute a succession of cylinders whose straight sections are parallelograms.
- the partitions 223 When the lower envelope 223" is subjected, via the first layer of the braking means, with an effort, it can easily be deformed because the partitions 223 "have the possibility of lying down, that is to say of seeing, locally, their angle ⁇ , decrease. This is what is visible at the figure 7b .
- the plastic material chosen to make the resilient layer 22 ' is a material which ensures that the deformation of the lower shell 222 "and the partitions 223" is not permanent. Thus, as soon as there is no more applied force, the resilient layer 22 "takes the shape of the figure 7a .
- the resilient layer 22 "could be produced by 3D printing, by injection or else equivalent means everywhere.
- first embodiment is characterized by alternative configurations of the first layer 21 or of the resilient layer 22.
- the “velor” type sealskin can be replaced by a layer of rubber. plastic material shaped so as to form protruding protuberances which form a mat of scales, as shown in the document EP 2976138 .
- Another variant consists in that the first layer 21 is made of the same material as that with which the gliding sole 11 is made and that the latter is waxed with an anti-recoil wax.
- the resilient layer could be in the form of a flexible blade.
- FIGS 8 , 9 and 10 show a second embodiment of the invention which differs from the first embodiment by the profile of the cavity 13 'which is formed in the ski 1 to receive the braking means 2.
- FIG 8 which is a longitudinal section and at figures 9 and 10 , respectively, cross sections C and D, the bottom of the cavity 13 'is convex both in the longitudinal direction and in the transverse direction.
- the braking means 2 are not described in detail for this embodiment because they can take one or the other of the two variants described for the first embodiment.
- the longitudinal convexity compensates for the camber of the ski. Indeed, although for reasons of simplicity, the skis are shown flat in the various figures, in the free state they have a camber which has the effect of slightly raising the central portion. Consequently, the longitudinal convexity of the bottom of the cavity 13 'allows an accentuated prominence of the central section of the braking means 2.
- the longitudinal and transverse convexity of the bottom of the cavity 13 ′ minimize the threshold effects created on the periphery of the cavity by the prominence of the braking means 2.
- the lateral edges of the braking means 2 are better protected inside the cavity 13 ', which is deeper on its periphery.
- the figure 11 shows a third embodiment of the invention in which the braking means 2 "have a variable profile in the longitudinal direction.
- they comprise several sections: a front portion 25, a central portion 26 and a rear portion 27.
- a resilient layer 22 is interposed between the first layer 21 and the ski.
- the figure 12 shows a fourth embodiment of the invention.
- This is a ski 1 intended for cross-country skiing and can be used both for classic practice and for skating practice.
- the lower surface of the ski does not have a cavity designed to receive the braking means 2 '".
- the sole of the ski may have a slight depression 15 in which the front portion of the braking means 2'"can be accommodated.
- the figure 13 shows a bottom view of a ski equipped with a braking device according to a fifth embodiment of the invention.
- the ski 1 ' is a ski for the practice of alpine ski touring.
- the user applies braking means 2 "" over the entire length of the gliding sole.
- the braking means 2 "" can be produced in accordance with one or the other of the braking means described or mentioned in the previous embodiments.
- the figure 14 shows in longitudinal section the ski according to the first embodiment of the invention when it is not loaded, that is to say when it is possible to measure the camber C.
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- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
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Abstract
Dispositif de freinage (2) pour ski (1), placé dans une portion centrale du ski et comprenant une première couche équipée de moyens augmentant la friction, comprenant, en outre, une couche résiliente (22), ou déformable, dont l'épaisseur sans contrainte est comprise entre 1 et 10 mm, de préférence entre 2 et 8 mm. Ladite couche résiliente (22) est placée entre les moyens augmentant la friction et les moyens de fixation servant à la fixation du dispositif au ski. Les moyens augmentant la friction peuvent être de tous types, par exemple ils peuvent consister en une multitude de poils saillants (skin) ou en une pluralité de protubérances saillantes (écailles).Braking device (2) for ski (1), placed in a central portion of the ski and comprising a first layer equipped with means for increasing friction, further comprising a resilient (22) or deformable layer, the thickness of which is without stress is between 1 and 10 mm, preferably between 2 and 8 mm. Said resilient layer (22) is placed between the means increasing the friction and the fixing means serving to fix the device to the ski. The friction increasing means can be of any type, for example they can consist of a multitude of protruding hairs (skin) or of a plurality of protruding protuberances (scales).
Description
La présente invention concerne une planche de glisse équipée d'un dispositif de freinage. En particulier, la présente invention concerne un ski de fond équipé de moyens anti-recul placés sous une portion centrale de celui-ci, au niveau de sa surface de glisse.The present invention relates to a gliding board equipped with a braking device. In particular, the present invention relates to a cross-country ski equipped with anti-recoil means placed under a central portion thereof, at its sliding surface.
La pratique du ski de fond dite « classique » nécessite que la portion centrale de la surface de la semelle de glisse du ski comporte des moyens anti-recul. Ces moyens anti-recul peuvent prendre plusieurs formes. Par exemple, ils peuvent consister en la mise en place d'une matière anti-glisse appelée « fart » qui est appliquée dans la seule zone centrale de la semelle du ski, couramment appelée « chambre à fart ». Ces moyens peuvent également consister en une bande assurant un freinage uni-directionnel qui est fixée sous la semelle de glisse du ski.The practice of so-called “classic” cross-country skiing requires the central portion of the surface of the ski gliding sole to include anti-recoil means. These anti-recoil means can take several forms. For example, they can consist of the placement of an anti-slip material called “wax” which is applied only in the central zone of the sole of the ski, commonly called “wax chamber”. These means may also consist of a strip providing uni-directional braking which is fixed under the gliding sole of the ski.
Une telle bande, parfois dénommée « skin » dans le milieu des pratiquants, est décrite dans le document
Il est également connu de former des écailles dans la portion centrale de la surface de glisse. Typiquement, ces écailles ont un profil longitudinal en pointe avec l'une des faces, celle dirigée vers l'avant du ski, qui fait un angle très faible avec le plan de la semelle du ski et l'autre face, celle dirigée vers l'arrière du ski, qui fait un angle proche de 90° avec cette même surface.It is also known to form scales in the central portion of the gliding surface. Typically, these scales have a longitudinal profile at a point with one of the faces, that directed towards the front of the ski, which forms a very small angle with the plane of the sole of the ski and the other face, that directed towards the ski. rear of the ski, which makes an angle close to 90 ° with this same surface.
Dans tous les cas, pour éviter que les moyens anti-recul n'affectent négativement les qualités de glisse vers l'avant du ski, ceux-ci coopèrent judicieusement avec le cambre du ski. En effet, un ski de fond présente un cambre tel que, à l'état libre et jusqu'à une certaine sollicitation faite en son centre, la portion centrale de sa surface de glisse n'est pas au contact avec la neige. La valeur du cambre ainsi que la rigidité du ski sont normalement adaptées au poids de l'utilisateur de telle façon que, au cours de la progression du skieur, le transfert de son poids d'une jambe à l'autre a pour effet de plaquer contre la neige la portion centrale du ski de la jambe d'appui et d'éloigner de la neige la portion centrale de l'autre ski.In all cases, to prevent the anti-recoil means from adversely affecting the forward sliding qualities of the ski, they judiciously cooperate with the camber of the ski. Indeed, a cross-country ski has a camber such that, in the free state and up to a certain stress made in its center, the central portion of its sliding surface is not in contact with the snow. The value of the camber as well as the rigidity of the ski are normally adapted to the weight of the user in such a way that, during the progression of the skier, the transfer of his weight from one leg to the other has the effect of tackling against the snow the central portion of the ski of the support leg and move away from the snow the central portion of the other ski.
La valeur du cambre d'un ski de fond est d'autre part choisie en fonction de la pratique. En effet, les skis de fond dédiés à la pratique dite « classique » ont une valeur de cambre beaucoup plus faible que ceux qui sont dédiés à la pratique dite « skating ». La hauteur de cambre importante d'un ski de skating le rend inutilisable pour la pratique du ski de fond classique car les moyens de freinage vont rester trop haut par rapport à la neige et leur efficacité sera faible.The value of the camber of a cross-country ski is also chosen according to the practice. Indeed, cross-country skis dedicated to so-called “classic” practice have a much lower camber value than those dedicated to so-called “skating” practice. The high camber height of a skating ski makes it unusable for the practice of classic cross-country skiing because the braking means will remain too high in relation to the snow and their efficiency will be low.
On le comprend, la mise en place de dispositif de freinage adéquat pour un ski de fond, ou pour un ski de randonnée implique de déterminer et de fixer un certain nombre de critères. Un de ces critères est la longueur, et dans une moindre mesure la largeur, du dispositif de freinage. En effet, comme la fonction de ce dernier est d'augmenter la friction, plus sa superficie sera grande, plus l'action de freinage sera importante. En revanche, lorsque le dispositif de freinage a une longueur trop grande, celui-ci reste en contact avec la neige même lorsque le ski est en phase de glisse et, ce, malgré le relèvement de cambre qui a lieu dès que le skieur n'est plus totalement en appui. Et alors, le dispositif de freinage gêne la phase de glisse et diminue par conséquent les performances du ski et du skieur.It will be understood that the installation of an adequate braking device for a cross-country ski, or for a ski touring involves determining and fixing a certain number of criteria. One of these criteria is the length, and to a lesser extent the width, of the braking device. Indeed, as the function of the latter is to increase friction, the greater its surface area, the greater the braking action will be. On the other hand, when the braking device is too long, it remains in contact with the snow even when the ski is in the sliding phase, despite the camber raising which takes place as soon as the skier does not. is more fully in support. And then, the braking device interferes with the sliding phase and consequently reduces the performance of the ski and the skier.
En général, les dispositifs de freinage, notamment ceux constitués par une peau doivent, pour avoir une efficacité satisfaisante en anti-recul, une longueur correspondant à environ 20 % de la longueur totale du ski et en tout état de cause supérieure à 19 % de cette longueur.In general, the braking devices, in particular those constituted by a skin, must, in order to have satisfactory anti-kickback efficiency, a length corresponding to approximately 20% of the total length of the ski and in any event greater than 19% of this length.
Les solutions de l'art antérieur n'offrent que des réponses insatisfaisantes à la mise en œuvre d'un dispositif de freinage pour ski qui résoud le difficile compromis entre une bonne efficacité de la fonction anti-recul, vers l'arrière, et la minimisation de l'entrave à l'avancée vers l'avant pendant la phase de glisse. De plus, les solutions de l'art antérieur ne permettent pas la conception de skis de fond qui puissent être utilisés à la fois pour la pratique classique et pour la pratique skating.The solutions of the prior art only offer unsatisfactory responses to the implementation of a ski braking device which resolves the difficult compromise between good efficiency of the anti-rollback function, towards the rear, and the minimization of the hindrance to the forward advance during the gliding phase. In addition, the solutions of the prior art do not allow the design of cross-country skis which can be used both for conventional practice and for skating practice.
L'objectif de l'invention est donc de proposer un dispositif de freinage qui améliore la performance de la fonction anti-recul pendant la phase d'appui, empêchant ainsi le ski de glisser vers l'arrière et diminue l'effet d'entrave à l'avancée du ski pendant la phase de glisse.The objective of the invention is therefore to provide a braking device which improves the performance of the anti-recoil function during the stance phase, thus preventing the ski from sliding backwards and reducing the effect of hindrance. the advance of the ski during the gliding phase.
L'objectif de l'invention est atteint par la fourniture d'un dispositif de freinage pour ski, comprenant une première couche équipée de moyens augmentant la friction, ainsi qu'une couche résiliente ou déformable dont l'épaisseur sans contrainte est comprise entre 1 et 10 mm.The objective of the invention is achieved by providing a braking device for a ski, comprising a first layer equipped with means for increasing friction, as well as a resilient or deformable layer, the unconstrained thickness of which is between 1 and 10 mm.
L'objectif de l'invention est également atteint par la fourniture d'un dispositif comprenant les caractéristiques du paragraphe précédent ainsi que toute combinaison techniquement acceptable d'une ou des caractéristiques suivantes :
- la couche résiliente a une épaisseur sans contrainte comprise entre 2 et 8 mm,
- des moyens de fixation amovible sont prévus,
- la couche résiliente est placée entre les moyens augmentant la friction et les moyens de fixation,
- les moyens augmentant la friction comprennent une multitude de poils saillants, il s'agit d'une « skin »,
- les moyens augmentant la friction comprennent une pluralité de protubérances saillantes, par exemple des écailles,
- la force de compression verticale à 25 % de la couche résiliente est comprise entre 10 et 80 kPa,
- la couche résiliente comprend un matériau de type mousse,
- le matériau de type mousse présente une densité comprise entre 10 et 60 kg/m3,
- le matériau de type mousse est un matériau à cellule fermée, ou un matériau à cellule ouverte à effet de peau,
- la couche résiliente comprend une pièce plastique déformable, ladite pièce étant obtenue par injection plastique ou par impression 3D,
- la couche résiliente comprend l'un des composants suivants : un textile 3D, une vessie remplie d'un élément gazeux, une poche remplie d'un gel,
- la longueur L2 des moyens de freinage est inférieure à 18 % de la longueur L1 du ski total.
- the resilient layer has a stress-free thickness between 2 and 8 mm,
- removable fixing means are provided,
- the resilient layer is placed between the friction increasing means and the fixing means,
- the means increasing the friction include a multitude of protruding hairs, it is a "skin",
- the means increasing the friction comprise a plurality of protruding protuberances, for example scales,
- the vertical compressive force at 25% of the resilient layer is between 10 and 80 kPa,
- the resilient layer comprises a foam-like material,
- the foam-like material has a density of between 10 and 60 kg / m3,
- the foam-like material is a closed-cell material, or an open-cell skin-like material,
- the resilient layer comprises a deformable plastic part, said part being obtained by plastic injection or by 3D printing,
- the resilient layer comprises one of the following components: a 3D textile, a bladder filled with a gaseous element, a pocket filled with a gel,
- the length L2 of the braking means is less than 18% of the length L1 of the total ski.
Avantageusement, le dispositif de freinage selon l'invention permet d'améliorer l'efficacité des moyens augmentant la friction pendant les phases de recul car il leur est permis de se déformer en réaction au terrain de glisse. Ainsi, du fait de leur efficacité améliorée, il est possible d'en réduire la longueur et/ou la superficie. Par conséquent, c'est non seulement le poids des moyens de freinage qui peut être réduit, mais également l'effet négatif qu'ils ont lors de phases de glisse.Advantageously, the braking device according to the invention makes it possible to improve the efficiency of the means which increase the friction during the recoil phases because they are allowed to deform in reaction to the sliding terrain. Thus, due to their improved efficiency, it is possible to reduce their length and / or area. Consequently, it is not only the weight of the braking means that can be reduced, but also the negative effect they have during sliding phases.
De plus, cette meilleure efficacité des moyens de freinage présente un avantage supplémentaire sur la conception des skis prévus pour le ski de fond dans sa pratique classique. Il devient possible d'utiliser, pour cette pratique, des skis qui ont une valeur de cambre supérieure à celle couramment utilisée. Dans certains cas même, on pourra envisager d'utiliser un ski, initialement conçu pour la pratique « skating », pour une pratique « classique », dans la mesure où on l'associe à un dispositif de freinage selon l'invention.In addition, this improved efficiency of the braking means has an additional advantage over the design of the skis provided for cross-country skiing in its conventional practice. It becomes possible to use, for this practice, skis which have a camber value greater than that currently used. In certain cases even, it is possible to envisage using a ski, initially designed for “skating” practice, for “classic” practice, insofar as it is associated with a braking device according to the invention.
L'invention sera mieux comprise à la lecture de la description annexée d'un dessin dans lequel :
- [
Fig. 1 ] Lafigure 1 est une vue de dessous d'un premier ski équipé d'un dispositif de freinage selon l'invention. - [
Fig. 2 ] Lafigure 2 est une vue en coupe longitudinale A-A du ski de lafigure 1 . - [
Fig. 3 ] Lafigure 3 est une vue en coupe transversale B-B du ski de lafigure 1 . - [
Fig. 4 ] Lafigure 4 est une vue en coupe longitudinale du ski de lafigure 1 , en cours d'utilisation. - [
Fig. 5 ] Lafigure 5 est une vue en coupe d'un premier mode de réalisation d'un dispositif de freinage selon l'invention. - [
Fig. 6 ] Lafigure 6 est une vue en coupe d'une première variante du premier mode de réalisation d'un dispositif de freinage selon l'invention. - [
Fig. 7a ] Lafigure 7a est une vue en coupe d'une deuxième variante du premier mode de réalisation d'un dispositif de freinage selon l'invention. - [
Fig. 7b ] Lafigure 7b est une vue en coupe de la deuxième variante du premier mode de réalisation d'un dispositif de freinage selon l'invention de lafigure 7a . - [
Fig. 8 ] Lafigure 8 est une vue d'un deuxième ski équipé d'un dispositif de freinage selon l'invention. - [
Fig. 9 ] Lafigure 9 est une vue en coupe transversale C-C du ski de lafigure 8 . - [
Fig. 10 ] Lafigure 10 est une vue en coupe transversale D-D du ski de lafigure 8 . - [
Fig. 11 ] Lafigure 11 est une vue en coupe longitudinale d'un troisième ski équipé d'un dispositif de freinage selon l'invention. - [
Fig. 12 ] Lafigure 12 est une vue en coupe longitudinale d'un quatrième ski équipé d'un dispositif de freinage selon l'invention. - [
Fig. 13 ] Lafigure 13 est une vue de dessous d'un ski alpin équipé d'un dispositif de freinage selon l'invention. - [
Fig. 14 ] Lafigure 14 est une vue en coupe longitudinale A-A du ski, non chargé, selon le premier mode de réalisation de l'invention. - [
Fig. 15 ] Lafigure 15 est une vue en coupe longitudinale d'un ski, non chargé, équipé d'un dispositif de freinage selon l'art antérieur.
- [
Fig. 1 ] Thefigure 1 is a bottom view of a first ski equipped with a braking device according to the invention. - [
Fig. 2 ] Thefigure 2 is a longitudinal sectional view AA of the ski of thefigure 1 . - [
Fig. 3 ] Thefigure 3 is a BB cross-sectional view of the ski of thefigure 1 . - [
Fig. 4 ] Thefigure 4 is a longitudinal sectional view of the ski of thefigure 1 , in use. - [
Fig. 5 ] Thefigure 5 is a sectional view of a first embodiment of a braking device according to the invention. - [
Fig. 6 ] Thefigure 6 is a sectional view of a first variant of the first embodiment of a braking device according to the invention. - [
Fig. 7a ] Thefigure 7a is a sectional view of a second variant of the first embodiment of a braking device according to the invention. - [
Fig. 7b ] Thefigure 7b is a sectional view of the second variant of the first embodiment of a braking device according to the invention of thefigure 7a . - [
Fig. 8 ] Thefigure 8 is a view of a second ski equipped with a braking device according to the invention. - [
Fig. 9 ] Thefigure 9 is a CC cross-sectional view of the ski of thefigure 8 . - [
Fig. 10 ] Thefigure 10 is a DD cross-sectional view of the ski of thefigure 8 . - [
Fig. 11 ] Thefigure 11 is a longitudinal sectional view of a third ski equipped with a braking device according to the invention. - [
Fig. 12 ] Thefigure 12 is a longitudinal sectional view of a fourth ski equipped with a braking device according to the invention. - [
Fig. 13 ] Thefigure 13 is a bottom view of an alpine ski equipped with a braking device according to the invention. - [
Fig. 14 ] Thefigure 14 is a longitudinal sectional view AA of the ski, unloaded, according to the first embodiment of the invention. - [
Fig. 15 ] Thefigure 15 is a longitudinal sectional view of a ski, unloaded, equipped with a braking device according to the prior art.
La
La
Le ski 1 se caractérise d'autre part par le fait que des moyens de freinage peuvent être fixés à la semelle de glisse. De préférence, ces moyens de freinage sont fixés de manière amovible afin de les remplacer, déplacer ou bien, comme nous le verrons plus loin dans la description, pour pouvoir utiliser le ski, sans les moyens de freinage. Dans le premier mode de réalisation de l'invention, une cavité 13 est ménagée dans la portion centrale de la semelle de glisse 11 afin de recevoir, au moins partiellement, les moyens de freinage. La cavité 13 présente un contour de forme complémentaire du contour extérieur des moyens de freinage 2 de façon que ces derniers viennent se loger précisément dans la cavité 13.The
Une chaussure 3 est également dessinée sur la
La
La
La
La première couche 21 est dans le premier mode de réalisation constituée d'un complexe appelé « peau de phoque ». Il s'agit d'une base 211 à partir de laquelle se projettent une multitude de fils 212 qui sont tous orientés dans la même direction, laquelle direction faisant un angle compris entre 10° et 80° avec la direction perpendiculaire au plan de la surface de glisse du ski. Les moyens de freinage sont fixés sous le ski de telle manière que la direction d'inclinaison des fils soit opposée à la direction d'avance A du ski. Ainsi, lorsque le ski se déplace dans la direction M, les fils vont avoir tendance à se plaquer sensiblement horizontalement le long de la base 211. Ce faisant, ils génèrent peu de frottements et ne gênent pas la glisse du ski. En revanche, lorsque le ski est sollicité par une force orientée dans la direction opposée à la direction M, les fils maintiennent, voire accentuent, leur position saillante et de ce fait génèrent une force de friction importante. C'est la fonction anti-recul des moyens de freinage.The
La couche résiliente doit être telle qu'elle permet une déformation des moyens de freinage avec une amplitude garantissant une bonne adaptabilité de ceux-ci aux imperfections du terrain. En pratique, lorsqu'elle n'est soumise à aucune contrainte, la couche résiliente 22 présente une épaisseur comprise entre 1 et 10 mm, et de préférence comprise entre 2 et 8 mm. De plus, il est important que la couche résiliente ne soit pas trop souple ni trop ferme. C'est pourquoi, on privilégiera des matériaux dont la force de compression à 25% soit comprise entre 10 et 80 kPa. Différents types de mousse peuvent être utilisés pour la fabrication de la couche résiliente. Par exemple des mousses Polyuréthane, Polyethylène, EVA, PLA (Acide Polylactique), etc.... Pour des raisons d'étanchéité, on pourra sélectionner des mousses à cellules fermées, des mousses à cellules ouvertes à effet de peau ou toute autre mousse étanchéifiée. Enfin, le choix d'un matériau de type mousse pour la couche résiliente n'est pas limitatif. En effet, celui-ci pourra, le cas échéant, être remplacé par une pièce déformable, laquelle étant par exemple obtenue par injection plastique ou par impression 3D, ou encore par un textile 3D, une poche de gel ou une vessie remplie avec de l'air ou tout autre élément gazeux.The resilient layer must be such as to allow deformation of the braking means with an amplitude guaranteeing good adaptability of the latter to the imperfections of the terrain. In practice, when it is not subjected to any stress, the
Dans le premier mode de réalisation, la couche résiliente présente une épaisseur d'environ 3 mm, une densité comprise entre 28 et 33 kg/m3 et une force de compression de 30 kPa.In the first embodiment, the resilient layer has a thickness of about 3 mm, a density of between 28 and 33 kg / m3 and a compressive force of 30 kPa.
La
La
On pourra par exemple réaliser la couche résiliente 22" par impression 3D, par injection ou encore partout moyen équivalent.For example, the
D'autres variantes du premier mode de réalisation, non représentées, se caractérisent par des configurations alternatives de la première couche 21 ou de la couche résiliente 22. Par exemple, la peau de phoque de type « velours » peut être remplacée par une couche en matériau plastique mise en forme de manière à former des protubérances saillantes qui constituent un tapis d'écailles, comme cela est montré dans le document
Les
La convexité longitudinale permet de compenser le cambre du ski. En effet, bien que pour des raisons de simplicité, les skis soient représentés à plat sur les différentes figures, ils présentent à l'état libre un cambre qui a pour effet de relever légèrement la portion centrale. Par conséquent, la convexité longitudinale du fond de la cavité 13' permet une proéminence accentuée de la section centrale des moyens de freinage 2.The longitudinal convexity compensates for the camber of the ski. Indeed, although for reasons of simplicity, the skis are shown flat in the various figures, in the free state they have a camber which has the effect of slightly raising the central portion. Consequently, the longitudinal convexity of the bottom of the cavity 13 'allows an accentuated prominence of the central section of the braking means 2.
De plus, convexité longitudinale et transversale du fond de la cavité 13' minimisent les effets de seuil créés sur le pourtour de la cavité par la proéminence des moyens de freinage 2. Ainsi, comme on peut le voir à la
La
La
La
La
Les bénéfices spécifiques apportés par l'invention permettent de concevoir un ski ayant un cambre plus important que celui d'un ski de fond « classique » selon l'art antérieur tel que représenté à la
Claims (17)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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FR1915532A FR3105009B1 (en) | 2019-12-24 | 2019-12-24 | Sliding board equipped with a braking device |
Publications (1)
Publication Number | Publication Date |
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EP3842105A1 true EP3842105A1 (en) | 2021-06-30 |
Family
ID=70738659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20213870.7A Pending EP3842105A1 (en) | 2019-12-24 | 2020-12-14 | Sliding board with unidirectional anti-slip system |
Country Status (2)
Country | Link |
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EP (1) | EP3842105A1 (en) |
FR (1) | FR3105009B1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4595215A (en) * | 1982-02-19 | 1986-06-17 | Karhu-Titan Oy | Coating material and coating for a ski, for variable snow conditions, and method of manufacture of same |
EP0294299A1 (en) * | 1987-05-27 | 1988-12-07 | Skis Rossignol S.A. | Downhill-ski and process for making the same |
US7543839B2 (en) | 2003-01-24 | 2009-06-09 | Erik Hartmann | System for skis |
EP2452729A1 (en) * | 2010-11-16 | 2012-05-16 | ATOMIC Austria GmbH | Cross-country ski with at least one device to prevent slipping backwards |
EP2976138A1 (en) | 2013-03-22 | 2016-01-27 | Fischer Sports GmbH | Climbing aid, ski and method for producing a climbing aid |
-
2019
- 2019-12-24 FR FR1915532A patent/FR3105009B1/en active Active
-
2020
- 2020-12-14 EP EP20213870.7A patent/EP3842105A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4595215A (en) * | 1982-02-19 | 1986-06-17 | Karhu-Titan Oy | Coating material and coating for a ski, for variable snow conditions, and method of manufacture of same |
EP0294299A1 (en) * | 1987-05-27 | 1988-12-07 | Skis Rossignol S.A. | Downhill-ski and process for making the same |
US7543839B2 (en) | 2003-01-24 | 2009-06-09 | Erik Hartmann | System for skis |
EP2452729A1 (en) * | 2010-11-16 | 2012-05-16 | ATOMIC Austria GmbH | Cross-country ski with at least one device to prevent slipping backwards |
EP2976138A1 (en) | 2013-03-22 | 2016-01-27 | Fischer Sports GmbH | Climbing aid, ski and method for producing a climbing aid |
Non-Patent Citations (1)
Title |
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ANONYMOUS: "Product Information ETHAFOAM M1 polyethylene foam", 21 June 2015 (2015-06-21), XP055729691, Retrieved from the Internet <URL:http://www.qualityfoam.com/docs/ethafoam-m1.pdf> [retrieved on 20200910] * |
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FR3105009B1 (en) | 2023-09-08 |
FR3105009A1 (en) | 2021-06-25 |
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