EP3632513A1 - Glideboard with injected core provided with longitudinal reinforcing elements - Google Patents

Glideboard with injected core provided with longitudinal reinforcing elements Download PDF

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Publication number
EP3632513A1
EP3632513A1 EP19201059.3A EP19201059A EP3632513A1 EP 3632513 A1 EP3632513 A1 EP 3632513A1 EP 19201059 A EP19201059 A EP 19201059A EP 3632513 A1 EP3632513 A1 EP 3632513A1
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EP
European Patent Office
Prior art keywords
core
board according
longitudinal
gliding board
groove
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
Application number
EP19201059.3A
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German (de)
French (fr)
Inventor
Emanuele CASSIBBA
David GOTTI
Maurice Muffat
Yann Malroux
Guillaume PANSART
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skis Rossignol SA
Original Assignee
Skis Rossignol SA
Rossignol SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Skis Rossignol SA, Rossignol SA filed Critical Skis Rossignol SA
Publication of EP3632513A1 publication Critical patent/EP3632513A1/en
Pending legal-status Critical Current

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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
    • A63C5/12—Making thereof; Selection of particular materials
    • A63C5/126—Structure of the core

Definitions

  • the invention relates to the field of sliding sports on snow or on water, and in particular skiing, snowboarding or kite-surfing. It relates more specifically to a board structure produced by injection methods, in which the core is formed during the molding of the board, by the chemical reaction of components forming a thermosetting foam.
  • a gliding board has a lower assembly, including a gliding sole, possibly bordered with edges, associated with one or more layers of mechanical reinforcements.
  • the board also comprises an upper assembly, also comprising one or more layers of mechanical reinforcement, most often surmounted by an outer layer ensuring the decoration and / or the protection of the board against the external environment.
  • This core can be produced by a prefabricated part, or as regards the invention by its formation in situ in the mold for manufacturing the board during the manufacture of the board.
  • the lower and upper assemblies are positioned in the mold, and components are introduced into the space separating these lower and upper assemblies to form an expansive foam, which presses the lower and upper assemblies against the walls of the mold.
  • this board is characterized in that it comprises at least one holding piece extending from one of the edge elements towards the interior of the core, this holding piece having a groove open towards the high.
  • the board also includes a longitudinal reinforcing element inserted in this groove.
  • this longitudinal reinforcing element extends substantially vertically inside the core, along the longitudinal axis of the board (Ox) and parallel to the median vertical plane of the board Oxz.
  • the portion of the longitudinal reinforcing element, extending upwards or downwards, beyond the opening of the groove, has its two opposite lateral faces in contact with the material injected from the core.
  • the invention consists in making a sliding board by inserting inside the structure reinforcing elements, placed in holding members which are linked to the edges, and which allow the positioning of these reinforcing elements to an intermediate level transversely.
  • the reinforcing elements are embedded inside the injected core, without they having moved during the injection operation since their lateral position is blocked by the characteristic holding pieces.
  • the reinforcing elements therefore cut the core into several parallel beams oriented parallel to the Oxz plane, between which these reinforcing elements are interposed.
  • the invention allows the incorporation into a injected core of localized reinforcing elements, which increase its resistance to crushing, these reinforcements being optimally arranged as a function of the distribution of the stresses to be supported.
  • the reinforcing element extends to the upper assembly if the groove is open upwards, or the lower assembly if it is open downwards.
  • the holding part rests on the lower assembly, so that the forces exerted from the upper face of the board, perpendicular to the reinforcing element, are transmitted via the latter to the part. holding, which in turn transmits them to the lower assembly.
  • the characteristic holding part can be constructed in various ways, while allowing precise positioning of the groove which receives the reinforcements.
  • the retaining piece may include hooking portions which cooperate with portions of complementary shape present on the internal face of the edge element.
  • the edge present on its face oriented towards the core of the lugs or cleats on which the complementary parts are mounted, so as to become mechanically integral with the edge.
  • the retaining piece can form a protuberance from the internal face of the edge element.
  • the retaining part is monolithic or monobloc with the edge element, which avoids any assembly or positioning operation of the part intended to receive the characteristic reinforcements.
  • the holding piece has through recesses in which the material of the core is present.
  • the retaining part is pierced so that the expandable foam which forms the core flows through these holes during its expansion, so as to form bridges within the core, which ensure improved anchoring of the part maintenance.
  • the geometry of the holding part, and in particular of the area which forms the groove, can be declined in different ways.
  • this retaining part has several grooves arranged in parallel, so as to accommodate several longitudinal reinforcing elements inserted in these grooves. It is also possible to use this holding piece with several grooves to produce the different sizes and structures of the board, by positioning the reinforcement or reinforcements in the most appropriate grooves.
  • the groove may have substantially vertical and parallel walls, possibly with ribs oriented vertically, so as to ensure a tightening and a blocking of the reinforcing element which is inserted, without requiring significant efforts.
  • the groove may also have inclined walls at a non-zero angle relative to the perpendicular to the gliding sole. In this case, the groove accommodates longitudinal reinforcing elements which are oriented with their upper end either inward or outward of the core relative to their lower end.
  • this retaining piece allows the establishment of longitudinal reinforcing elements which extend upwards to the upper assembly.
  • the reinforcing element therefore receives the supports directly from the upper assembly, and in particular the reinforcing layers of the latter.
  • the contact can be direct or indirect by the interposition of a bonding layer, or even by the presence of a very thin thickness of the foam of the core which interferes between the top of the longitudinal reinforcing element and the upper assembly, so as to ensure effective bonding of these two reinforcements one on the other.
  • the longitudinal reinforcements which can be used are chosen to have optimized mechanical properties.
  • these reinforcing elements can be made of wood, or of a composite material, typically based on glass or carbon fibers. They thus make it possible to increase the stiffness in longitudinal bending, as well as the stiffness in torsion, and the resistance to crushing, with the lowest possible impact on the weight of the board.
  • preference will be given to the longitudinal reinforcing elements which have a maximum height at least three times greater than their width in the case of composite materials, and greater than their width in the case of wooden material.
  • the positioning of the holding pieces can be optimized as a function of the dimensioning of the board, and of the mechanical stresses to be supported during the expansion of the core.
  • the longitudinal reinforcing element can be positioned more or less forward relative to the edge element, to increase the mechanical properties in the area where it is present.
  • the present invention can be implemented on different types of boards, and in particular an alpine ski, as illustrated in FIG. figure 1 .
  • a ski 1 has two raised ends, namely on the front side a tip 2 , and on the rear side, a heel 3.
  • the central area, or pad 4 is intended to receive the elements of the binding.
  • such a ski comprises a lower assembly 10 including a sliding sole 11 intended to come into contact with snow, and bordered by lateral edges 13 , 14 , the fins 15 , 16 of which rest on the upper face of the sole. It will not depart from the scope of the invention if the ski or the gliding board does not have edges, in particular in the case of short skis, cross-country skis or a board for gliding on water.
  • the sole 11 is covered with a reinforcing layer 12 which can be produced from different materials having a high rigidity, such as for example composite or metallic materials.
  • a reinforcing layer 12 which can be produced from different materials having a high rigidity, such as for example composite or metallic materials.
  • the geometry of these reinforcements, as well as their number can be declined as a function of the mechanical properties desired for the board.
  • the ski 1 also comprises an upper assembly 20 including in the illustrated form an upper decorative and protective layer 21.
  • this upper layer 21 is extended laterally down on the side of the ski to rest on top of it.
  • a song element 25 , 26 In other words, this construction is of the "song + shell" type.
  • the height of the edges 25 , 26 is less than the height of the core in a cross section of the ski.
  • the invention also covers the variants in which the upper protective layer is substantially horizontal, with edge elements which have a height substantially equal to that of the board, corresponding to so-called “sandwich” structures, and in which the edge elements have a height slightly greater than that of the core, measured in a cross section of the ski.
  • the upper assembly 20 also includes a reinforcing layer 22 , disposed under the upper protective layer 21.
  • the shape and the materials constituting this reinforcement can be declined as a function of the desired mechanical properties.
  • these reinforcements are composite materials based on glass fibers or carbon for example, embedded in a resin, or even are metallic materials. It is also possible to combine several reinforcing layers of different or similar geometries and natures.
  • the ski 1 also includes edge elements 25 , 26 , which rest on the edge cord 13 , 14 , and which form the lateral face of the board. Between the upper 20 and lower 10 assemblies and the lateral edges 25 , 26 , is the core 30 of the board, which is made of a typically polyurethane foam (abbreviated PU), or more generally of an expanding foam. inside this volume, to press the upper assembly 10 , the lower assembly 20 and the edges 15 , 16 against the walls of the mold.
  • PU typically polyurethane foam
  • this ski also comprises two longitudinal reinforcing elements 31 , 32 which extend vertically, between the lower 12 and upper 22 reinforcements over all or part of the length of the ski, inside the core of the ski.
  • Interstices 33 , 34 are provided, respectively between the upper reinforcement 22 and the upper surface of the longitudinal reinforcement as well as between the lower reinforcement 12 and the lower surface of the longitudinal reinforcement, to allow the passage of the foam from the core 30 in order to ensuring that these longitudinal reinforcements 31 , 32 are bonded to the adjacent elements, in this case the lower 12 and upper 22 reinforcements .
  • These longitudinal reinforcements 31 , 32 are made of a material having mechanical properties of resistance to crushing and of rigidity which are superior to those of the material of the core 30. Typically, it may be wood, or even materials composites including fibers of high toughness, oriented longitudinally, that is to say parallel to the longitudinal axis of the ski, to increase the longitudinal flexural strength of the board. This longitudinal reinforcement may also include fibers oriented vertically, that is to say perpendicular to the gliding sole, so as to increase the crush resistance of the ski. The width of these longitudinal reinforcements, measured in one direction transverse is optimized to limit the impact of the weight of these reinforcements in that of the ski.
  • these longitudinal reinforcements 31 , 32 are elongated elements oriented in the longitudinal direction (Ox) of the ski and positioned vertically, in a plane parallel to the plane (Oxz), that is to say that they transversely separate the core into several juxtaposed longitudinal beams.
  • these longitudinal reinforcements are laterally offset from the edges in the direction of the center of the core.
  • the two longitudinal reinforcements 31 , 32 are offset from the internal wall of the edge, respectively 25 , 26 towards the center of the core by a distance of approximately 8 to 15mm. This distance is chosen according to the mechanical properties sought for skiing.
  • the core of the ski is therefore composed of a longitudinal beam of PU foam, then of a longitudinal reinforcing beam of wood or composite, followed by a zone central in PU foam, then another longitudinal reinforcing beam in wood or composite and finally another longitudinal beam in PU foam.
  • a longitudinal reinforcement is framed on either side by the core foam material, and is embedded in the core.
  • the material injected from the core is separated into three substantially parallel parts or beams, namely a central beam 36 and two lateral beams 35 , 37.
  • these longitudinal reinforcements 31 , 32 are held in position during the molding operation, to allow the material of the expandable foam of the core to spread over the entire volume of the future core, and therefore between the longitudinal reinforcements, avoiding unexpected movement of the characteristic reinforcements.
  • the ski comprises holding pieces 40 , which are as illustrated in the figure 3 placed on top of the lower assembly 10 , and connected to the edge elements 25 , 26.
  • the longitudinal reinforcement 31 is held in position by a holding element 40 connected to one of the edge elements 25 while the other longitudinal element 32 is held in position by another holding element 140 connected to the other edge element 26.
  • These parts support are preferably made of light materials, such as plastic.
  • These retaining pieces 40 have a groove 41 open upwards, defined between two walls 42 , 43 , and which receives the longitudinal reinforcing element 31. This groove can, in a shape not shown, be open downwards, the reinforcement being preferably pinched in the holding pieces so as not to fall during molding.
  • the opening of the groove 41 is oriented vertically along the Oz axis but it would not go beyond the scope of the invention if its opening was inclined relative to the vertical (Oz axis), preferably between + or - 45 degrees, so that the longitudinal reinforcement is itself inclined in the core of the ski.
  • the holding part 40 comprises a hooking portion 50 allowing connection to the edge element 25 , by positioning this hooking portion 50 on a portion 27 of the edge element 25 forming inward protrusion of the ski structure.
  • the retaining piece may be fitted onto the portion 27 of the edge element 25 or may be a monobloc element with the edge element 25.
  • the part 40 has two substantially vertical walls 42 , 43 and whose facing faces have vertical ribs 46 making it possible to block in position, by pinching, compression or snap-fastening, the reinforcing element which has been introduced into the groove 41 defined between the walls 42 , 43.
  • this groove 41 preferably receives a wooden reinforcing element with a height between 5 and 15 mm, and with a thickness between 4 and 15mm corresponding to the width of the groove 41.
  • the invention covers variants in which the height (measured along the axis Oz) of the longitudinal reinforcing element is constant, or varies according to the length of the latter, to adapt to the thickness of the board.
  • the horizontal wall 44 which provides the connection between the vertical walls 42 , 43 rests on the lower assembly 10 , and has in the illustrated form an opening 45 , allowing the foam of the core during expansion to interfere with the contact of the vertical reinforcing element 31 to ensure effective bonding of the retaining part 40 with the lower assembly 10.
  • the geometry of the lower face of the vertical wall 44 can be arranged to facilitate the creep of this resin, comprising for example circulation channels.
  • the length measured in the longitudinal direction Ox of the groove 41 is provided to ensure effective maintenance of the reinforcement vis-à-vis the stresses exerted by the foam of the core during expansion.
  • a length of between 5 and 12 mm is satisfactory.
  • two holding pieces can be provided to hold a longitudinal reinforcement element, these holding pieces each being positioned a few centimeters from the front and rear ends of the longitudinal reinforcement.
  • Flying buttresses 47 can be provided to increase the rigidity of the wall 43 and prevent its deformation during the expansion of the foam of the core.
  • the retaining piece 40 comprises a zone 50 ensuring the attachment to the edge element 25 , 26. More specifically, this zone 50 comprises hook-shaped portions 53 , 54 defining an opening 52 of greater width than the distance separating the two hooked portions 53 , 54. This opening 52 is intended to receive a swollen portion of complementary shape 28 of constant horizontal section, and connected to the edge element 25 by a connector portion 29. This portion 28 is of height greater than or equal to the thickness of the attachment portion 50 , to avoid any detachment during the expansion phase of the foam of the core. As illustrated in figure 9 , when the holding piece 40 is mounted on the projection 27 of the edge element 25 , the transverse position along the axis Oy of the groove 41 is fixed, so as to block the longitudinal reinforcement element 31 when it is mounted in the groove 41.
  • this attachment portion 50 includes through recesses 51 , allowing the foam of the core in progress expansion to pass through this hooking portion, and thus ensure effective anchoring of the holding part relative to the rest of the core.
  • the figure 5 illustrates a holding part 70 , in which the width of the groove 71 is less than that of the part of the figure 5 , so as to receive a vertical reinforcing element of smaller thickness, typically based on a composite material including fibers of high tenacity.
  • the width of this groove 71 is a few millimeters, between 0.5 to 3mm, to receive a longitudinal reinforcing element 31 , 32 made of glass fibers or carbon fibers which has a thickness similar to the width of the groove 71.
  • the retaining part 80 may comprise several grooves 81 , 82 , 83 offset transversely, making it possible to accommodate several longitudinal reinforcing elements, or else to adjust the transverse position of the longitudinal reinforcing element, according to the desired mechanical properties.
  • This part 80 may also include vertical through recesses 86 , 87 , defined between the vertical walls 84 , 85 ; 88 , 89 of two adjacent grooves, so as to allow passage of the foam from the core and effective anchoring of the holding part in the core.
  • the longitudinal reinforcing elements can be optimized thanks to the holding pieces according to the invention. So, as illustrated in the figure 8 , the longitudinal reinforcing element 31 is held in position by two holding pieces 40 , 140 which are arranged near the ends of the element 31. In the form illustrated in the figure 9 , the longitudinal reinforcing element 231 is held in position by three holding pieces 240 , 241 , 242 , the grooves of which are located at substantially identical distances from the dimension line. Thus, the reinforcing element 231 is slightly curved to match the curvature of this line of dimensions.
  • the groove of the retaining elements is oriented with its opening upwards, and reinforcing elements extending upwards, close to or in contact with the upper assembly, but the The invention also covers variants in which the groove is arranged in an opposite configuration, with its opening facing downwards, and reinforcements extending up to near or in contact with the lower assembly.
  • the structure of the gliding board according to the invention makes it possible to integrate longitudinal and substantially vertical mechanical reinforcements in a ski or a gliding board, or more precisely inside the core of the ski. or of the gliding board, where the core is injected around these reinforcements, this with great latitude in transverse positioning, and an assurance of maintaining the position of this or these reinforcements during the core injection operation.

Abstract

Planche de glisse (1) comportant :• un ensemble supérieur (20) comportant au moins une couche de renfort (22);• un ensemble inférieur (10) comportant au moins une couche de renfort (12) et une semelle de glisse (11) ;• un noyau (30) réalisé en un matériau injecté entre lesdits ensembles inférieur (10) et supérieur (20), et bordé latéralement d'éléments de chant (25,26) ;caractérisée en ce qu'elle comporte :• au moins une pièce de maintien (40) s'étendant depuis un des éléments de chant (25) en direction de l'intérieur du noyau (30), ladite pièce de maintien présentant une gorge (41) ouverte vers le haut ou le bas ;• et un élément de renfort longitudinal (31,32) positionné dans ladite gorge (41) et s'étendant longitudinalement dans le matériau injecté du noyau, la portion de l'élément de renfort longitudinal (31,32) s'étendant au-delà de l'ouverture de la gorge vers le haut ou vers le bas, présentant deux faces opposées latérales en contact du matériau injecté du noyau.•  Gliding board (1) comprising: • an upper assembly (20) comprising at least one reinforcement layer (22) • a lower assembly (10) comprising at least one reinforcement layer (12) and a gliding sole (11 ); • a core (30) made of a material injected between said lower (10) and upper (20) assemblies, and laterally bordered by edge elements (25, 26); characterized in that it comprises: at least one retaining piece (40) extending from one of the edge elements (25) towards the interior of the core (30), said retaining piece having a groove (41) open upwards or downwards; • and a longitudinal reinforcing element (31,32) positioned in said groove (41) and extending longitudinally in the material injected from the core, the portion of the longitudinal reinforcing element (31,32) extending au- beyond the opening of the groove upwards or downwards, having two opposite lateral faces in contact with the material injected from the core.

Description

Domaine techniqueTechnical area

L'invention se rattache au domaine des sports de glisse sur neige ou sur eau, et notamment du ski, du snowboard ou du kite-surf. Elle vise plus spécifiquement une structure de planche réalisée par des méthodes d'injection, dans lequel le noyau est formé pendant le moulage de la planche, par la réaction chimique de composants formant une mousse thermodurcissable.The invention relates to the field of sliding sports on snow or on water, and in particular skiing, snowboarding or kite-surfing. It relates more specifically to a board structure produced by injection methods, in which the core is formed during the molding of the board, by the chemical reaction of components forming a thermosetting foam.

Elle concerne plus spécifiquement des agencements particuliers permettant le positionnement et le maintien en position de renforts mécaniques destinés à améliorer les propriétés notamment de résistance à la flexion longitudinale et à la torsion de telles planches.It relates more specifically to specific arrangements allowing the positioning and the maintenance in position of mechanical reinforcements intended to improve the properties in particular of resistance to longitudinal bending and to torsion of such boards.

Techniques antérieuresPrevious techniques

De manière générale, une planche de glisse comporte un ensemble inférieur, incluant une semelle de glisse, éventuellement bordée de carres, associée à une ou plusieurs couches de renforts mécaniques. La planche comprend également un ensemble supérieur, comprenant également une ou plusieurs couches de renfort mécanique, surmontée le plus souvent d'une couche extérieure assurant la décoration et/ou la protection de la planche face à l'environnement extérieur.In general, a gliding board has a lower assembly, including a gliding sole, possibly bordered with edges, associated with one or more layers of mechanical reinforcements. The board also comprises an upper assembly, also comprising one or more layers of mechanical reinforcement, most often surmounted by an outer layer ensuring the decoration and / or the protection of the board against the external environment.

Ces ensembles supérieur et inférieur sont séparés par un noyau, qui écarte les couches de renfort mécanique de la fibre neutre de la planche.These upper and lower assemblies are separated by a core, which separates the mechanical reinforcement layers from the neutral fiber of the board.

Ce noyau peut être réalisé par une pièce préfabriquée, ou en ce qui concerne l'invention par sa formation in-situ dans le moule de fabrication de la planche lors de la fabrication de la planche. Ainsi, dans ce cas, les ensembles inférieur et supérieur sont positionnés dans le moule, et des composants sont introduits dans l'espace séparant ces ensembles inférieur et supérieur pour former une mousse expansive, qui plaque les ensembles inférieur et supérieur contre les parois du moule.This core can be produced by a prefabricated part, or as regards the invention by its formation in situ in the mold for manufacturing the board during the manufacture of the board. Thus, in this case, the lower and upper assemblies are positioned in the mold, and components are introduced into the space separating these lower and upper assemblies to form an expansive foam, which presses the lower and upper assemblies against the walls of the mold.

Par rapport aux planches présentant des noyaux usinés ou préfabriqués, l'emploi de noyaux injectés présente un avantage en termes de coûts puisqu'il n'est pas nécessaire de réaliser avant moulage une pièce avec une géométrie précise étant donné que le noyau prend la forme imposée par le moule.Compared to boards with machined or prefabricated cores, the use of injected cores presents an advantage in terms of costs since it is not necessary to produce before molding a part with a precise geometry since the core takes the form imposed by the mold.

Toutefois, cette solution présente quelques inconvénients puisque les propriétés mécaniques de la mousse sont inférieures à celles des matériaux employés pour la réalisation de noyaux pré-usinés, généralement à base de bois.However, this solution has some drawbacks since the mechanical properties of the foam are lower than those of the materials used for the production of pre-machined cores, generally based on wood.

Un autre inconvénient des noyaux injectés réside dans leur aspect homogène, impliquant qu'il est impossible d'y adjoindre des renforts localisés en partie centrale ou intermédiaire en largeur. En effet, lors de la réaction chimique générant la mousse expansive, les contraintes mécaniques exercées sont telles que tout élément se situant entre l'ensemble supérieur et l'ensemble inférieur se trouve inévitablement plaqué en définitive contre l'un ou l'autre de ces deux ensembles, sans qu'il soit possible de le prédire à l'avance.Another drawback of the injected cores lies in their homogeneous appearance, implying that it is impossible to add reinforcements located in the central or intermediate part in width. Indeed, during the chemical reaction generating the expansive foam, the mechanical stresses exerted are such that any element lying between the upper assembly and the lower assembly is inevitably pressed ultimately against one or the other of these two sets, without it being possible to predict it in advance.

Le problème du positionnement d'éléments de renfort à l'intérieur du moule, préalablement à l'injection du noyau a déjà été traité pour certains types de renforts par les solutions décrites dans les documents EP 1 421 978 , et EP 1 504 796 . Dans ces documents, des éléments de renfort horizontaux, c'est-à-dire parallèles au plan de la semelle de la planche sont mis en place dans le moule avant injection du noyau, en reposant sur des épaulements formés sur les faces internes des éléments de chant. Ainsi, les bords de ces éléments de renfort sont maintenus en position, de sorte que lors de l'expansion de la mousse formant le noyau, cet élément de renfort reste au niveau vertical qui a été fixé lors de la fermeture du moule.The problem of positioning reinforcing elements inside the mold, prior to injection of the core has already been dealt with for certain types of reinforcement by the solutions described in the documents. EP 1,421,978 , and EP 1 504 796 . In these documents, horizontal reinforcing elements, that is to say parallel to the plane of the sole of the board, are placed in the mold before injection of the core, resting on shoulders formed on the internal faces of the elements. of singing. Thus, the edges of these reinforcing elements are held in position, so that during the expansion of the foam forming the core, this reinforcing element remains at the vertical level which was fixed when the mold was closed.

L'inconvénient de cette solution réside dans le fait qu'elle n'est adaptée que pour des éléments de renfort suffisamment larges qui s'étendent transversalement d'un chant à l'autre, et qu'elle n'est donc pas adaptée à la mise en place d'éléments de renfort qui seraient situés à des niveaux intermédiaires transversalement, et dont les dimensions font qu'ils ne viennent pas au contact des chants.The disadvantage of this solution lies in the fact that it is only suitable for sufficiently wide reinforcing elements which extend transversely from one edge to the other, and that it is therefore not suitable for the establishment of reinforcing elements which would be located at intermediate levels transversely, and whose dimensions mean that they do not come into contact with the edges.

Exposé de l'inventionStatement of the invention

Pour résoudre ces problèmes, le Demandeur a mis au point une planche de glisse qui comporte :

  • un ensemble supérieur comportant au moins une couche de renfort et éventuellement d'une couche supérieure de décoration et de protection ;
  • un ensemble inférieur comportant au moins une couche de renfort et d'une semelle de glisse, éventuellement bordée de carres ;
  • un noyau réalisé en un matériau injecté entre les ensembles inférieur et supérieur et bordé latéralement d'éléments de chant.
To solve these problems, the Applicant has developed a gliding board which comprises:
  • an upper assembly comprising at least one reinforcing layer and optionally an upper decorative and protective layer;
  • a lower assembly comprising at least one reinforcement layer and a gliding sole, possibly bordered by edges;
  • a core made of a material injected between the lower and upper assemblies and laterally bordered by edge elements.

Conformément à l'invention, cette planche se caractérise en ce qu'elle comporte au moins une pièce de maintien s'étendant depuis un des éléments de chant en direction de l'intérieur du noyau, cette pièce de maintien présentant une gorge ouverte vers le haut. La planche comporte également un élément de renfort longitudinal inséré dans cette gorge. Autrement dit, cet élément de renfort longitudinal s'étend sensiblement verticalement à l'intérieur du noyau, suivant l'axe longitudinal de la planche (Ox) et parallèlement au plan vertical médian de la planche Oxz. La portion de l'élément de renfort longitudinal en s'étendant vers le haut ou vers le bas, au-delà de l'ouverture de la gorge, présente ses deux faces opposées latérales en contact du matériau injecté du noyau.According to the invention, this board is characterized in that it comprises at least one holding piece extending from one of the edge elements towards the interior of the core, this holding piece having a groove open towards the high. The board also includes a longitudinal reinforcing element inserted in this groove. In other words, this longitudinal reinforcing element extends substantially vertically inside the core, along the longitudinal axis of the board (Ox) and parallel to the median vertical plane of the board Oxz. The portion of the longitudinal reinforcing element, extending upwards or downwards, beyond the opening of the groove, has its two opposite lateral faces in contact with the material injected from the core.

Autrement dit, l'invention consiste à réaliser une planche de glisse en insérant à l'intérieur de la structure des éléments de renfort, placés dans des organes de maintien qui sont liés aux chants, et qui permettent le positionnement de ces éléments de renfort à un niveau intermédiaire transversalement.In other words, the invention consists in making a sliding board by inserting inside the structure reinforcing elements, placed in holding members which are linked to the edges, and which allow the positioning of these reinforcing elements to an intermediate level transversely.

En d'autres termes, les éléments de renfort sont noyés à l'intérieur du noyau injecté, sans qu'ils n'aient bougé pendant l'opération d'injection puisque leur position latérale est bloquée par les pièces de maintien caractéristiques. Les éléments de renforts découpent donc le noyau en plusieurs poutres parallèles orientées parallèlement au plan Oxz, entre lesquelles ces éléments de renforts sont interposés.In other words, the reinforcing elements are embedded inside the injected core, without they having moved during the injection operation since their lateral position is blocked by the characteristic holding pieces. The reinforcing elements therefore cut the core into several parallel beams oriented parallel to the Oxz plane, between which these reinforcing elements are interposed.

Ainsi, l'invention permet l'incorporation dans un noyau injecté d'éléments de renforts localisés, qui augmentent sa résistance à l'écrasement, ces renforts étant disposés de façon optimale en fonction de la distribution des contraintes à supporter.Thus, the invention allows the incorporation into a injected core of localized reinforcing elements, which increase its resistance to crushing, these reinforcements being optimally arranged as a function of the distribution of the stresses to be supported.

Préférentiellement, l'élément de renfort s'étend jusqu'à l'ensemble supérieur si la gorge est ouverte vers le haut, ou l'ensemble inférieur si elle est ouverte vers le bas.Preferably, the reinforcing element extends to the upper assembly if the groove is open upwards, or the lower assembly if it is open downwards.

Avantageusement en pratique, la pièce de maintien repose sur l'ensemble inférieur, de sorte que les efforts exercés depuis la face supérieure de la planche, à l'aplomb de l'élément de renfort, sont transmis via ce dernier jusqu'à la pièce de maintien, qui les transmet à son tour à l'ensemble inférieur.Advantageously in practice, the holding part rests on the lower assembly, so that the forces exerted from the upper face of the board, perpendicular to the reinforcing element, are transmitted via the latter to the part. holding, which in turn transmits them to the lower assembly.

En pratique, la pièce de maintien caractéristique peut être construite de diverses manières, tout en permettant le positionnement précis de la gorge qui accueille les renforts.In practice, the characteristic holding part can be constructed in various ways, while allowing precise positioning of the groove which receives the reinforcements.

Ainsi, dans une première forme de réalisation, la pièce de maintien peut comporter des portions d'accrochage qui coopèrent avec des portions de forme complémentaire présentes sur la face interne de l'élément de chant. Autrement dit, le chant présente sur sa face orientée vers le noyau des ergots ou des taquets sur lesquels viennent se monter les pièces complémentaires, de manière à devenir solidaires mécaniquement du chant. Dans cette configuration, il est possible d'utiliser des pièces de maintien différentes, notamment en ce qui concerne le positionnement de la gorge, pour un même élément de chant.Thus, in a first embodiment, the retaining piece may include hooking portions which cooperate with portions of complementary shape present on the internal face of the edge element. In other words, the edge present on its face oriented towards the core of the lugs or cleats on which the complementary parts are mounted, so as to become mechanically integral with the edge. In this configuration, it is possible to use different holding pieces, in particular as regards the positioning of the groove, for the same edge element.

Dans une autre forme de réalisation, la pièce de maintien peut former une excroissance de la face interne de l'élément de chant. Autrement dit, la pièce de maintien est monolithique ou monobloc avec l'élément de chant, ce qui évite toute opération de montage ou de positionnement de la pièce destinée à recevoir les renforts caractéristiques.In another embodiment, the retaining piece can form a protuberance from the internal face of the edge element. In other words, the retaining part is monolithic or monobloc with the edge element, which avoids any assembly or positioning operation of the part intended to receive the characteristic reinforcements.

Selon une autre caractéristique de l'invention, il est possible que la pièce de maintien comporte des évidements traversant dans lesquels la matière du noyau est présente. Autrement dit, la pièce de maintien est percée de telle sorte que la mousse expansible qui forme le noyau flue à travers ces perçages lors de son expansion, de manière à former des pontages au sein du noyau, qui assurent un ancrage amélioré de la pièce de maintien.According to another characteristic of the invention, it is possible that the holding piece has through recesses in which the material of the core is present. In other words, the retaining part is pierced so that the expandable foam which forms the core flows through these holes during its expansion, so as to form bridges within the core, which ensure improved anchoring of the part maintenance.

La géométrie de la pièce de maintien, et en particulier de la zone qui forme la gorge peut être déclinée de différentes manières.The geometry of the holding part, and in particular of the area which forms the groove, can be declined in different ways.

Ainsi, il est possible que cette pièce de maintien comporte plusieurs gorges disposées parallèlement, de manière à accueillir plusieurs éléments de renforts longitudinaux insérés dans ces gorges. Il est également possible d'utiliser cette pièce de maintien à plusieurs gorges pour réaliser les différentes tailles et structures de planche, en positionnant le ou les renforts dans les gorges les plus appropriées.Thus, it is possible that this retaining part has several grooves arranged in parallel, so as to accommodate several longitudinal reinforcing elements inserted in these grooves. It is also possible to use this holding piece with several grooves to produce the different sizes and structures of the board, by positioning the reinforcement or reinforcements in the most appropriate grooves.

En pratique, la gorge peut présenter des parois sensiblement verticales et parallèles, avec éventuellement des nervures orientées verticalement, de manière à assurer un serrage et un blocage de l'élément de renfort qui est inséré, sans nécessiter des efforts importants. La gorge peut également présenter des parois inclinées d'un angle non nul par rapport à la perpendiculaire à la semelle de glisse. Dans ce cas, la gorge accueille des éléments de renforts longitudinaux qui sont orientés avec leur extrémité haute soit vers l'intérieur, soit vers l'extérieur du noyau par rapport à leur extrémité basse.In practice, the groove may have substantially vertical and parallel walls, possibly with ribs oriented vertically, so as to ensure a tightening and a blocking of the reinforcing element which is inserted, without requiring significant efforts. The groove may also have inclined walls at a non-zero angle relative to the perpendicular to the gliding sole. In this case, the groove accommodates longitudinal reinforcing elements which are oriented with their upper end either inward or outward of the core relative to their lower end.

En pratique, l'utilisation de cette pièce de maintien permet la mise en place d'éléments de renforts longitudinaux qui s'étendent vers le haut jusqu'à l'ensemble supérieur. L'élément de renfort reçoit donc les appuis directement depuis l'ensemble supérieur, et notamment les couches de renfort de ce dernier. Le contact peut être direct ou indirect par l'interposition d'une couche de collage, ou bien encore par la présence d'une très fine épaisseur de la mousse du noyau qui s'immisce entre le haut de l'élément de renfort longitudinal et l'ensemble supérieur, de manière à assurer un collage efficace de ces deux renforts l'un sur l'autre.In practice, the use of this retaining piece allows the establishment of longitudinal reinforcing elements which extend upwards to the upper assembly. The reinforcing element therefore receives the supports directly from the upper assembly, and in particular the reinforcing layers of the latter. The contact can be direct or indirect by the interposition of a bonding layer, or even by the presence of a very thin thickness of the foam of the core which interferes between the top of the longitudinal reinforcing element and the upper assembly, so as to ensure effective bonding of these two reinforcements one on the other.

En pratique, les renforts longitudinaux qui peuvent être utilisés sont choisis pour présenter des propriétés mécaniques optimisées. En pratique, ces éléments de renforts peuvent être réalisés en bois, ou en matériau composite, typiquement à base de fibres de verre ou de carbone. Ils permettent ainsi d'augmenter la raideur en flexion longitudinale, ainsi que la raideur en torsion, et la tenue à l'écrasement, avec un impact le plus faible possible sur le poids de la planche. Pour ce faire, on privilégiera les éléments longitudinaux de renforts qui présentent une hauteur maximale au moins trois fois supérieur à leur largeur dans le cas de matériaux composites, et supérieure à leur largeur dans le cas de matériau en bois.In practice, the longitudinal reinforcements which can be used are chosen to have optimized mechanical properties. In practice, these reinforcing elements can be made of wood, or of a composite material, typically based on glass or carbon fibers. They thus make it possible to increase the stiffness in longitudinal bending, as well as the stiffness in torsion, and the resistance to crushing, with the lowest possible impact on the weight of the board. To do this, preference will be given to the longitudinal reinforcing elements which have a maximum height at least three times greater than their width in the case of composite materials, and greater than their width in the case of wooden material.

Le positionnement des pièces de maintien peut être optimisé en fonction du dimensionnement de la planche, et des contraintes mécaniques à supporter lors de l'expansion du noyau. Ainsi, on peut prévoir que la planche comporte au moins deux pièces de maintien associées à chaque chant, et disposées à des niveaux longitudinaux décalés. Dans le cas de planches particulièrement longues, il est possible de prévoir une ou plusieurs pièces de maintien supplémentaires situées à un niveau intermédiaire en longueur. En pratique, l'élément de renfort longitudinal peut être positionné plus ou moins en avant par rapport à l'élément de chant, pour augmenter les propriétés mécaniques dans la zone où il est présent.The positioning of the holding pieces can be optimized as a function of the dimensioning of the board, and of the mechanical stresses to be supported during the expansion of the core. Thus, provision can be made for the board to include at least two holding pieces associated with each edge, and arranged at offset longitudinal levels. In the case of particularly long boards, it is possible to provide one or more additional holding pieces situated at an intermediate level in length. In practice, the longitudinal reinforcing element can be positioned more or less forward relative to the edge element, to increase the mechanical properties in the area where it is present.

En pratique, on minimise les risques de déplacement inopinés du renfort longitudinal lors de l'injection du noyau, en choisissant de positionner le milieu de l'élément longitudinal de renfort sensiblement au milieu des deux pièces de maintien les plus éloignées longitudinalement.In practice, the risks of unexpected displacement of the longitudinal reinforcement are minimized when the core is injected, by choosing to position the middle of the longitudinal reinforcement element substantially in the middle of the two most longitudinally distant holding pieces.

Description sommaire des dessinsBrief description of the drawings

La manière de réaliser l'invention, ainsi que les avantages qui en découlent, ressortiront bien de la description des modes de réalisation qui suivent, à l'appui des figures annexées dans lesquelles :

  • La figure 1 est une vue en perspective sommaire d'un ski réalisé conformément à l'invention.
  • La figure 2 est une vue en coupe transversale selon le plan II - II' de la figure 1.
  • La figure 3 est une vue en coupe transversale de la planche de la figure 1 selon le plan III - III'.
  • Les figures 4, 5 et 6 sont des vues en perspective sommaire de pièces de maintien selon trois modes de réalisation différents.
  • La figure 7 est une vue de dessus montrant l'assemblage de la pièce de la figure 5 associée à un élément de chant.
  • La figure 8 est une vue en coupe selon le plan IV - IV' de la figure 1.
  • La figure 9 est une vue analogue à la figure 8 d'une variante de réalisation.
The manner of carrying out the invention, as well as the advantages which result therefrom, will emerge clearly from the description of the embodiments which follow, with the support of the appended figures in which:
  • The figure 1 is a summary perspective view of a ski produced in accordance with the invention.
  • The figure 2 is a cross-sectional view along the plane II - II 'of the figure 1 .
  • The figure 3 is a cross-sectional view of the board of the figure 1 according to plan III - III '.
  • The Figures 4, 5 and 6 are summary perspective views of holding parts according to three different embodiments.
  • The figure 7 is a top view showing the assembly of the part of the figure 5 associated with a song element.
  • The figure 8 is a sectional view along plane IV - IV 'of the figure 1 .
  • The figure 9 is a view analogous to the figure 8 of an alternative embodiment.

Manières de réaliser l'inventionWays to realize the invention

La présente invention peut être mise en œuvre sur différents types de planches de glisse, et notamment un ski alpin, tel qu'illustré à la figure 1. Un tel ski 1 présente deux extrémités relevées, à savoir du côté avant une spatule 2, et du côté arrière, un talon 3. La zone centrale, ou patin 4, est destinée à recevoir les éléments de la fixation.The present invention can be implemented on different types of boards, and in particular an alpine ski, as illustrated in FIG. figure 1 . Such a ski 1 has two raised ends, namely on the front side a tip 2 , and on the rear side, a heel 3. The central area, or pad 4 , is intended to receive the elements of the binding.

Plus précisément, et comme illustré à la figure 2, un tel ski comporte un ensemble inférieur 10 incluant une semelle de glisse 11 destinée à venir au contact de la neige, et bordé de carres latérales 13, 14, dont les ailettes 15, 16 reposent sur la face supérieure de la semelle. On ne sortira pas du cadre de l'invention si le ski ou la planche de glisse ne comporte pas de carres, en particulier dans le cas de skis courts, de skis de fond ou d'une planche de glisse sur eau.More specifically, and as illustrated in the figure 2 , such a ski comprises a lower assembly 10 including a sliding sole 11 intended to come into contact with snow, and bordered by lateral edges 13 , 14 , the fins 15 , 16 of which rest on the upper face of the sole. It will not depart from the scope of the invention if the ski or the gliding board does not have edges, in particular in the case of short skis, cross-country skis or a board for gliding on water.

La semelle 11 est recouverte d'une couche de renfort 12 qui peut être réalisée à partir de différents matériaux présentant une rigidité élevée, comme par exemple des matériaux composites ou métalliques. Bien entendu, la géométrie de ces renforts, ainsi que leur nombre peuvent être déclinés en fonction des propriétés mécaniques souhaitées pour la planche.The sole 11 is covered with a reinforcing layer 12 which can be produced from different materials having a high rigidity, such as for example composite or metallic materials. Of course, the geometry of these reinforcements, as well as their number can be declined as a function of the mechanical properties desired for the board.

Le ski 1 comporte également un ensemble supérieur 20 incluant dans la forme illustrée une couche supérieure de décoration et de protection 21. Dans la forme illustrée, cette couche supérieure 21 se prolonge latéralement en descendant sur le côté du ski pour reposer sur le dessus d'un élément de chant 25,26. Autrement dit, cette construction est du type « chant+coque ». Dans cette réalisation, la hauteur des chants 25,26 est inférieure à la hauteur du noyau dans une section transversale du ski. Bien entendu, l'invention couvre également les variantes dans laquelle la couche supérieure de protection est sensiblement horizontale, avec des éléments de chant qui présentent une hauteur sensiblement égale à celle de la planche, correspondant à des structures dites « sandwich », et dans lesquels les éléments de chant ont une hauteur légèrement supérieure à celle du noyau, mesurée dans une section transversale du ski.The ski 1 also comprises an upper assembly 20 including in the illustrated form an upper decorative and protective layer 21. In the illustrated form, this upper layer 21 is extended laterally down on the side of the ski to rest on top of it. a song element 25 , 26. In other words, this construction is of the "song + shell" type. In this embodiment, the height of the edges 25 , 26 is less than the height of the core in a cross section of the ski. Of course, the invention also covers the variants in which the upper protective layer is substantially horizontal, with edge elements which have a height substantially equal to that of the board, corresponding to so-called “sandwich” structures, and in which the edge elements have a height slightly greater than that of the core, measured in a cross section of the ski.

Dans la forme illustrée, l'ensemble supérieur 20 comporte également une couche de renfort 22, disposée sous la couche supérieure de protection 21. La forme et les matériaux constituant ce renfort peuvent être déclinés en fonction des propriétés mécaniques souhaitées. Généralement, ces renforts sont des matériaux composites à base de fibres de verre ou de carbone par exemple, noyées dans une résine, ou encore sont des matériaux métalliques. Il est également possible de combiner plusieurs couches de renfort de géométries et de natures différentes ou similaires.In the illustrated form, the upper assembly 20 also includes a reinforcing layer 22 , disposed under the upper protective layer 21. The shape and the materials constituting this reinforcement can be declined as a function of the desired mechanical properties. Generally, these reinforcements are composite materials based on glass fibers or carbon for example, embedded in a resin, or even are metallic materials. It is also possible to combine several reinforcing layers of different or similar geometries and natures.

Le ski 1 comporte également des éléments de chant 25, 26, qui reposent sur le cordon des carres 13, 14, et qui forment la face latérale de la planche. Entre les ensembles supérieur 20 et inférieur 10 et les chants latéraux 25, 26, se trouve le noyau 30 de la planche, qui est réalisé en une mousse typiquement de polyuréthanne (en abrégé PU), ou plus généralement d'une mousse s'expansant à l'intérieur de ce volume, pour plaquer l'ensemble supérieur 10, l'ensemble inférieur 20 et les chants 15, 16 contre les parois du moule.The ski 1 also includes edge elements 25 , 26 , which rest on the edge cord 13 , 14 , and which form the lateral face of the board. Between the upper 20 and lower 10 assemblies and the lateral edges 25 , 26 , is the core 30 of the board, which is made of a typically polyurethane foam (abbreviated PU), or more generally of an expanding foam. inside this volume, to press the upper assembly 10 , the lower assembly 20 and the edges 15 , 16 against the walls of the mold.

Conformément à l'invention, ce ski comporte également deux éléments de renfort longitudinaux 31, 32 qui s'étendent verticalement, entre les renforts inférieur 12 et supérieur 22 sur une tout ou partie de la longueur du ski, à l'intérieur du noyau du ski. Des interstices 33, 34 sont prévus, respectivement entre le renfort supérieur 22 et la surface supérieure du renfort longitudinal ainsi qu'entre le renfort inférieur 12 et la surface inférieure du renfort longitudinal, pour permettre le passage de la mousse du noyau 30 afin d'assurer un collage de ces renforts longitudinaux 31, 32 sur les éléments adjacents, en l'occurrence les renforts inférieur 12 et supérieur 22. According to the invention, this ski also comprises two longitudinal reinforcing elements 31 , 32 which extend vertically, between the lower 12 and upper 22 reinforcements over all or part of the length of the ski, inside the core of the ski. Interstices 33 , 34 are provided, respectively between the upper reinforcement 22 and the upper surface of the longitudinal reinforcement as well as between the lower reinforcement 12 and the lower surface of the longitudinal reinforcement, to allow the passage of the foam from the core 30 in order to ensuring that these longitudinal reinforcements 31 , 32 are bonded to the adjacent elements, in this case the lower 12 and upper 22 reinforcements .

Ces renforts longitudinaux 31, 32 sont réalisés en un matériau présentant des propriétés mécaniques de résistance à l'écrasement et de rigidité qui sont supérieures à celles du matériau du noyau 30. Typiquement, il peut s'agir de bois, ou bien encore de matériaux composites incluant des fibres de forte ténacité, orientées longitudinalement, c'est-à-dire parallèlement à l'axe longitudinal du ski, pour augmenter la résistance à la flexion longitudinale de la planche. Ce renfort longitudinal peut également inclure des fibres orientées verticalement, c'est-à-dire perpendiculairement à la semelle de glisse, de manière à augmenter la résistance à l'écrasement du ski. La largeur de ces renforts longitudinaux, mesurée dans un sens transversal est optimisée pour limiter l'impact du poids de ces renforts dans celui du ski.These longitudinal reinforcements 31 , 32 are made of a material having mechanical properties of resistance to crushing and of rigidity which are superior to those of the material of the core 30. Typically, it may be wood, or even materials composites including fibers of high toughness, oriented longitudinally, that is to say parallel to the longitudinal axis of the ski, to increase the longitudinal flexural strength of the board. This longitudinal reinforcement may also include fibers oriented vertically, that is to say perpendicular to the gliding sole, so as to increase the crush resistance of the ski. The width of these longitudinal reinforcements, measured in one direction transverse is optimized to limit the impact of the weight of these reinforcements in that of the ski.

Conformément à l'invention, ces renforts longitudinaux 31, 32 sont des éléments longilignes orientés selon la direction longitudinale (Ox) du ski et positionnés verticalement, dans un plan parallèle au plan (Oxz), c'est-à-dire qu'ils séparent transversalement le noyau en plusieurs poutres longitudinales juxtaposées. Autrement dit, ces renforts longitudinaux sont décalés latéralement des chants en direction du centre du noyau. Dans la réalisation illustrée, les deux renforts longitudinaux 31, 32 sont décalés de la paroi interne du chant, respectivement 25,26 vers le centre du noyau d'une distance d'environ 8 à 15mm. Cette distance est choisie en fonction des propriétés mécaniques recherchées pour le ski. Ainsi, dans le sens transversal, d'un chant à l'autre, le noyau du ski est donc composé d'une poutre longitudinale de mousse PU, puis d'une poutre de renfort longitudinal en bois ou composite, suivie d'une zone centrale en mousse PU, puis d'une autre poutre de renfort longitudinal en bois ou composite et enfin d'une autre poutre longitudinale de mousse PU. De la sorte, un renfort longitudinal est encadré de part et d'autre par le matériau de la mousse du noyau, et est encastré dans le noyau. Ainsi, du fait des deux renforts longitudinaux 31,32, le matériau injecté du noyau est séparé en trois parties ou poutres sensiblement parallèles, à savoir une poutre centrale 36 et deux poutres latérales 35,37. According to the invention, these longitudinal reinforcements 31 , 32 are elongated elements oriented in the longitudinal direction (Ox) of the ski and positioned vertically, in a plane parallel to the plane (Oxz), that is to say that they transversely separate the core into several juxtaposed longitudinal beams. In other words, these longitudinal reinforcements are laterally offset from the edges in the direction of the center of the core. In the illustrated embodiment, the two longitudinal reinforcements 31 , 32 are offset from the internal wall of the edge, respectively 25 , 26 towards the center of the core by a distance of approximately 8 to 15mm. This distance is chosen according to the mechanical properties sought for skiing. Thus, in the transverse direction, from one edge to another, the core of the ski is therefore composed of a longitudinal beam of PU foam, then of a longitudinal reinforcing beam of wood or composite, followed by a zone central in PU foam, then another longitudinal reinforcing beam in wood or composite and finally another longitudinal beam in PU foam. In this way, a longitudinal reinforcement is framed on either side by the core foam material, and is embedded in the core. Thus, due to the two longitudinal reinforcements 31 , 32 , the material injected from the core is separated into three substantially parallel parts or beams, namely a central beam 36 and two lateral beams 35 , 37.

Conformément à l'invention, ces renforts longitudinaux 31, 32 sont maintenus en position pendant l'opération de moulage, pour permettre au matériau de la mousse expansible du noyau de se répandre dans l'intégralité du volume du futur noyau, et donc entre les renforts longitudinaux, en évitant de déplacer inopinément les renforts caractéristiques.According to the invention, these longitudinal reinforcements 31 , 32 are held in position during the molding operation, to allow the material of the expandable foam of the core to spread over the entire volume of the future core, and therefore between the longitudinal reinforcements, avoiding unexpected movement of the characteristic reinforcements.

Pour ce faire, le ski comporte des pièces de maintien 40, qui sont comme illustré à la figure 3 posées sur le dessus de l'ensemble inférieur 10, et reliées aux éléments de chant 25, 26. Comme illustré à la figure 3, le renfort longitudinal 31 est maintenu en position par un élément de maintien 40 relié à l'un des éléments de chant 25 tandis que l'autre élément longitudinal 32 est maintenu en position par un autre élément de maintien 140 relié à l'autre élément de chant 26. Ces pièces de maintien sont de préférence en matériaux légers, comme par exemple en matière plastique. Ces pièces de maintien 40 comportent une gorge 41 ouverte vers le haut, définie entre deux parois 42, 43, et qui accueille l'élément de renfort longitudinal 31. Cette gorge peut dans une forme non illustrée être ouverte vers le bas, le renfort étant alors de préférence pincé dans les pièces de maintien pour ne pas tomber lors du moulage. L'ouverture de la gorge 41 est orientée verticalement selon l'axe Oz mais on ne sortirait pas du cadre de l'invention si son ouverture était inclinée par rapport à la verticale (axe Oz), de préférence entre + ou - 45 degrés, pour que le renfort longitudinal soit lui-même incliné dans le noyau du ski. La pièce de maintien 40 comporte une portion d'accrochage 50 permettant le raccordement à l'élément de chant 25, par le positionnement de cette portion d'accrochage 50 sur une portion 27 de l'élément de chant 25 formant excroissance vers l'intérieur de la structure du ski. La pièce de maintien peut être emboitée sur la portion 27 de l'élément de chant 25 ou peut être un élément monobloc avec l'élément de chant 25. To do this, the ski comprises holding pieces 40 , which are as illustrated in the figure 3 placed on top of the lower assembly 10 , and connected to the edge elements 25 , 26. As illustrated in the figure 3 , the longitudinal reinforcement 31 is held in position by a holding element 40 connected to one of the edge elements 25 while the other longitudinal element 32 is held in position by another holding element 140 connected to the other edge element 26. These parts support are preferably made of light materials, such as plastic. These retaining pieces 40 have a groove 41 open upwards, defined between two walls 42 , 43 , and which receives the longitudinal reinforcing element 31. This groove can, in a shape not shown, be open downwards, the reinforcement being preferably pinched in the holding pieces so as not to fall during molding. The opening of the groove 41 is oriented vertically along the Oz axis but it would not go beyond the scope of the invention if its opening was inclined relative to the vertical (Oz axis), preferably between + or - 45 degrees, so that the longitudinal reinforcement is itself inclined in the core of the ski. The holding part 40 comprises a hooking portion 50 allowing connection to the edge element 25 , by positioning this hooking portion 50 on a portion 27 of the edge element 25 forming inward protrusion of the ski structure. The retaining piece may be fitted onto the portion 27 of the edge element 25 or may be a monobloc element with the edge element 25.

Plus précisément, et comme illustré à la figure 4, la pièce 40 comporte deux parois 42, 43 sensiblement verticales et dont les faces en regard présentent des nervures verticales 46 permettant de bloquer en position, par pincement, compression ou encliquetage, l'élément de renfort qui a été introduit dans la gorge 41 définie entre les parois 42, 43. Dans ce mode de réalisation, cette gorge 41 reçoit de préférence un élément de renfort en bois d'une hauteur comprise entre 5 et 15 mm, et d'une épaisseur comprise entre 4 et 15mm correspondant à la largeur de la gorge 41. Bien entendu, l'invention couvre des variantes dans lesquelles la hauteur (mesurée selon l'axe Oz) de l'élément de renfort longitudinal est constante, ou varie selon la longueur de ce dernier, pour s'adapter à l'épaisseur de la planche. La paroi horizontale 44 qui assure la liaison entre les parois verticales 42, 43 reposent sur l'ensemble inférieur 10, et présente dans la forme illustrée une ouverture 45, permettant à la mousse du noyau en cours d'expansion de s'immiscer au contact de l'élément de renfort vertical 31 pour assurer un collage efficace de la pièce de maintien 40 avec l'ensemble inférieur 10. La géométrie de la face inférieure de la paroi verticale 44 peut être agencée pour faciliter le fluage de cette résine en comportant par exemple des canaux de circulation.More specifically, and as illustrated in the figure 4 , the part 40 has two substantially vertical walls 42 , 43 and whose facing faces have vertical ribs 46 making it possible to block in position, by pinching, compression or snap-fastening, the reinforcing element which has been introduced into the groove 41 defined between the walls 42 , 43. In this embodiment, this groove 41 preferably receives a wooden reinforcing element with a height between 5 and 15 mm, and with a thickness between 4 and 15mm corresponding to the width of the groove 41. Of course, the invention covers variants in which the height (measured along the axis Oz) of the longitudinal reinforcing element is constant, or varies according to the length of the latter, to adapt to the thickness of the board. The horizontal wall 44 which provides the connection between the vertical walls 42 , 43 rests on the lower assembly 10 , and has in the illustrated form an opening 45 , allowing the foam of the core during expansion to interfere with the contact of the vertical reinforcing element 31 to ensure effective bonding of the retaining part 40 with the lower assembly 10. The geometry of the lower face of the vertical wall 44 can be arranged to facilitate the creep of this resin, comprising for example circulation channels.

La longueur mesurée dans le sens longitudinal Ox de la gorge 41 est prévue pour assurer un maintien efficace du renfort vis-à-vis des contraintes exercées par la mousse du noyau en cours d'expansion. En particulier, une longueur comprise entre 5 et 12 mm donne satisfaction. Dans ce cas, deux pièces de maintien peuvent être prévues pour maintenir un élément de renfort longitudinal, ces pièces de maintien étant chacune positionnée à quelques centimètres des extrémités avant et arrière du renfort longitudinal. Des arcs-boutants 47 peuvent être prévus pour augmenter la rigidité de la paroi 43 et éviter sa déformation pendant l'expansion de la mousse du noyau.The length measured in the longitudinal direction Ox of the groove 41 is provided to ensure effective maintenance of the reinforcement vis-à-vis the stresses exerted by the foam of the core during expansion. In particular, a length of between 5 and 12 mm is satisfactory. In this case, two holding pieces can be provided to hold a longitudinal reinforcement element, these holding pieces each being positioned a few centimeters from the front and rear ends of the longitudinal reinforcement. Flying buttresses 47 can be provided to increase the rigidity of the wall 43 and prevent its deformation during the expansion of the foam of the core.

Dans la forme illustrée, la pièce de maintien 40, comporte une zone 50 assurant l'accrochage sur l'élément de chant 25,26. Plus précisément, cette zone 50 comporte des portions en forme de crochets 53, 54 définissant une ouverture 52 de plus grande largeur que la distance séparant les deux portions crochetées 53, 54. Cette ouverture 52 est destinée à recevoir une portion renflée de forme complémentaire 28 de section horizontale constante, et reliée à l'élément de chant 25 par une portion de raccord 29. Cette portion 28 est de hauteur supérieure ou égale à l'épaisseur de la portion d'accrochage 50, pour éviter tout décrochement pendant la phase d'expansion de la mousse du noyau. Comme illustré à la figure 9, lorsque la pièce de maintien 40 est montée sur l'excroissance 27 de l'élément de chant 25, la position transversale selon l'axe Oy de la gorge 41 est fixe, de manière à bloquer l'élément de renfort longitudinal 31 lorsqu'il est monté dans la gorge 41. In the illustrated form, the retaining piece 40 comprises a zone 50 ensuring the attachment to the edge element 25 , 26. More specifically, this zone 50 comprises hook-shaped portions 53 , 54 defining an opening 52 of greater width than the distance separating the two hooked portions 53 , 54. This opening 52 is intended to receive a swollen portion of complementary shape 28 of constant horizontal section, and connected to the edge element 25 by a connector portion 29. This portion 28 is of height greater than or equal to the thickness of the attachment portion 50 , to avoid any detachment during the expansion phase of the foam of the core. As illustrated in figure 9 , when the holding piece 40 is mounted on the projection 27 of the edge element 25 , the transverse position along the axis Oy of the groove 41 is fixed, so as to block the longitudinal reinforcement element 31 when it is mounted in the groove 41.

Selon une caractéristique complémentaire, cette portion d'accrochage 50 comporte des évidements traversants 51, permettant à la mousse du noyau en cours d'expansion de traverser cette portion d'accrochage, et d'assurer ainsi un ancrage efficace de la pièce de maintien par rapport au reste du noyau.According to an additional characteristic, this attachment portion 50 includes through recesses 51 , allowing the foam of the core in progress expansion to pass through this hooking portion, and thus ensure effective anchoring of the holding part relative to the rest of the core.

Bien entendu, différentes variantes sont envisageables pour la constitution de la pièce de maintien, comme illustré aux figures 5 et 6. Ainsi, la figure 5 illustre une pièce de maintien 70, dans laquelle la largeur de la gorge 71 est moindre que celle de la pièce de la figure 5, de manière à accueillir un élément de renfort vertical de plus faible épaisseur typiquement à base d'un matériau composite incluant des fibres de haute ténacité. Dans ce cas, la largeur de cette gorge 71 est de quelques millimètres, entre 0.5 à 3mm, pour recevoir un élément de renfort longitudinal 31,32 en fibres de verre ou en fibres de carbone qui comporte une épaisseur similaire à la largeur de la gorge 71. Complémentairement, et comme illustré à la figure 6, la pièce de maintien 80 peut comporter plusieurs gorges 81, 82, 83 décalées transversalement, permettant d'accueillir plusieurs éléments de renforts longitudinaux, ou encore de régler la position transversale de l'élément de renfort longitudinal, selon les propriétés mécaniques souhaitées.Of course, different variants can be envisaged for the constitution of the holding part, as illustrated in Figures 5 and 6 . So the figure 5 illustrates a holding part 70 , in which the width of the groove 71 is less than that of the part of the figure 5 , so as to receive a vertical reinforcing element of smaller thickness, typically based on a composite material including fibers of high tenacity. In this case, the width of this groove 71 is a few millimeters, between 0.5 to 3mm, to receive a longitudinal reinforcing element 31 , 32 made of glass fibers or carbon fibers which has a thickness similar to the width of the groove 71. In addition, and as illustrated in figure 6 , the retaining part 80 may comprise several grooves 81 , 82 , 83 offset transversely, making it possible to accommodate several longitudinal reinforcing elements, or else to adjust the transverse position of the longitudinal reinforcing element, according to the desired mechanical properties.

Cette pièce 80 peut également comporter des évidements traversants verticaux 86, 87, définis entre les parois verticales 84, 85 ; 88, 89 de deux gorges adjacentes, de manière à permettre un passage de la mousse du noyau et un ancrage efficace de la pièce de maintien dans le noyau.This part 80 may also include vertical through recesses 86 , 87 , defined between the vertical walls 84 , 85 ; 88 , 89 of two adjacent grooves, so as to allow passage of the foam from the core and effective anchoring of the holding part in the core.

Le positionnement des éléments de renforts longitudinaux peut être optimisé grâce aux pièces de maintien selon l'invention. Ainsi, comme illustré à la figure 8, l'élément de renfort longitudinal 31 est maintenu en position par deux pièces de maintien 40,140 qui sont disposées à proximité des extrémités de l'élément 31. Dans la forme illustrée à la figure 9, l'élément de renfort longitudinal 231 est maintenu en position par trois pièces de maintien 240,241,242, dont les gorges sont localisées à distances sensiblement identiques de la ligne de cotes. Ainsi, l'élément de renfort 231 est légèrement cintré pour épouser la courbure de cette ligne de cotes.The positioning of the longitudinal reinforcing elements can be optimized thanks to the holding pieces according to the invention. So, as illustrated in the figure 8 , the longitudinal reinforcing element 31 is held in position by two holding pieces 40 , 140 which are arranged near the ends of the element 31. In the form illustrated in the figure 9 , the longitudinal reinforcing element 231 is held in position by three holding pieces 240 , 241 , 242 , the grooves of which are located at substantially identical distances from the dimension line. Thus, the reinforcing element 231 is slightly curved to match the curvature of this line of dimensions.

Dans les exemples illustrés aux figures, la gorge des éléments de maintien est orientée avec son ouverture vers le haut, et des éléments de renfort s'étendant vers le haut, jusqu'à proximité ou au contact de l'ensemble supérieur, mais l'invention couvre également les variantes où la gorge est disposée dans une configuration opposée, avec son ouverture orientée vers le bas, et des renforts s'étendant jusqu'à proximité ou au contact de l'ensemble inférieur.In the examples illustrated in the figures, the groove of the retaining elements is oriented with its opening upwards, and reinforcing elements extending upwards, close to or in contact with the upper assembly, but the The invention also covers variants in which the groove is arranged in an opposite configuration, with its opening facing downwards, and reinforcements extending up to near or in contact with the lower assembly.

Il ressort de ce qui précède que la structure de la planche de glisse conforme à l'invention permet d'intégrer des renforts mécaniques longitudinaux et sensiblement verticaux dans un ski ou une planche de glisse, ou plus précisément à l'intérieur du noyau du ski ou de la planche de glisse, où le noyau est injecté autour de ces renforts, ceci avec une grande latitude de positionnement transversal, et une assurance du maintien de la position de ce ou ces renforts pendant l'opération d'injection du noyau.It emerges from the above that the structure of the gliding board according to the invention makes it possible to integrate longitudinal and substantially vertical mechanical reinforcements in a ski or a gliding board, or more precisely inside the core of the ski. or of the gliding board, where the core is injected around these reinforcements, this with great latitude in transverse positioning, and an assurance of maintaining the position of this or these reinforcements during the core injection operation.

Claims (14)

Planche de glisse (1) comportant : • un ensemble supérieur (20) comportant au moins une couche de renfort (22); • un ensemble inférieur (10) comportant au moins une couche de renfort (12) et une semelle de glisse (11) ; • un noyau (30) réalisé en un matériau injecté entre lesdits ensembles inférieur (10) et supérieur (20), et bordé latéralement d'éléments de chant (25,26) ; caractérisée en ce qu'elle comporte : • au moins une pièce de maintien (40) s'étendant depuis un des éléments de chant (25) en direction de l'intérieur du noyau (30), ladite pièce de maintien présentant une gorge (41) ouverte vers le haut ou le bas ; • et un élément de renfort longitudinal (31,32) positionné dans ladite gorge (41) et s'étendant longitudinalement dans le matériau injecté du noyau, la portion de l'élément de renfort longitudinal (31,32) s'étendant au-delà de l'ouverture de la gorge vers le haut ou vers le bas, présentant deux faces opposées latérales en contact du matériau injecté du noyau. Snowboard (1) comprising: • an upper assembly (20) comprising at least one reinforcing layer (22); • a lower assembly (10) comprising at least one reinforcing layer (12) and a sliding sole (11); • a core (30) made of a material injected between said lower (10) and upper (20) assemblies, and laterally bordered by edge elements (25,26); characterized in that it comprises: • at least one holding part (40) extending from one of the edge elements (25) towards the interior of the core (30), said holding part having a groove (41) open upwards or low; • and a longitudinal reinforcing element (31,32) positioned in said groove (41) and extending longitudinally in the material injected from the core, the portion of the longitudinal reinforcing element (31,32) extending au- beyond the opening of the groove upwards or downwards, having two opposite lateral faces in contact with the material injected from the core. Planche de glisse selon la revendication 1, caractérisée en ce que la pièce de maintien (40) repose sur l'ensemble inférieur (10).Gliding board according to claim 1, characterized in that the holding part (40) rests on the lower assembly (10). Planche de glisse selon la revendication 1, caractérisée en ce que l'élément de renfort longitudinal (31,32) s'étend depuis la gorge jusqu'à l'ensemble supérieur (20).Gliding board according to claim 1, characterized in that the longitudinal reinforcing element (31,32) extends from the groove to the upper assembly (20). Planche de glisse selon la revendication 1, caractérisée en ce que la pièce de maintien (40) comporte des portions d'accrochage (50) coopérant avec des portions (28) de forme complémentaire présentes sur la face interne de l'élément de chant (25).Gliding board according to claim 1, characterized in that the retaining part (40) comprises hooking portions (50) cooperating with portions (28) of complementary shape present on the internal face of the edge element ( 25). Planche de glisse selon la revendication 1, caractérisée en ce que la pièce de maintien forme une excroissance de la face interne de l'élément de chant.Gliding board according to claim 1, characterized in that the retaining piece forms a protuberance from the internal face of the edge element. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce que la pièce de maintien comporte des évidements traversants (51) dans lesquels la matière du noyau (30) est présente.Gliding board according to one of the preceding claims, characterized in that the retaining part comprises through recesses (51) in which the material of the core (30) is present. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce que la pièce de maintien (80) comporte plusieurs gorges (81,82,83) disposées parallèlement, et plusieurs éléments de renforts longitudinaux insérés dans lesdites plusieurs gorges.Gliding board according to one of the preceding claims, characterized in that the holding piece (80) comprises several grooves (81,82,83) arranged in parallel, and several longitudinal reinforcing elements inserted in said several grooves. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce que la gorge (41) présente des parois (42,43) sensiblement verticales et parallèles.Gliding board according to one of the preceding claims, characterized in that the groove (41) has walls (42,43) which are substantially vertical and parallel. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce que la gorge présente des parois inclinées d'un angle non nul par rapport à la perpendiculaire à la semelle de glisse.Gliding board according to one of the preceding claims, characterized in that the groove has walls inclined at a non-zero angle relative to the perpendicular to the gliding sole. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce que l'élément longitudinal de renfort (31) présente une hauteur maximale au moins 3 fois supérieure à sa largeur.Gliding board according to one of the preceding claims, characterized in that the longitudinal reinforcing element (31) has a maximum height at least 3 times greater than its width. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce que l'élément de renfort longitudinal est réalisé en bois ou en matériau composite, à base de fibres de verre ou de carbone notamment.Gliding board according to one of the preceding claims, characterized in that the longitudinal reinforcing element is made of wood or of composite material, in particular based on glass or carbon fibers. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce qu'elle comporte au moins deux pièces de maintien associées à chaque élément de chant, et disposées à des niveaux longitudinaux décalés.Gliding board according to one of the preceding claims, characterized in that it comprises at least two retaining parts associated with each edge element, and arranged at offset longitudinal levels. Planche de glisse selon la revendication 12, caractérisée en ce que le milieu de l'élément longitudinal de renfort est situé sensiblement au milieu des deux pièces de maintien les plus éloignées.Gliding board according to claim 12, characterized in that the middle of the longitudinal reinforcing element is situated substantially in the middle of the two most distant holding pieces. Planche de glisse selon l'une des revendications précédentes, caractérisée en ce qu'elle comporte deux éléments de renforts longitudinaux (31,32), l'un des renforts longitudinaux (31) étant maintenu en position par un élément de maintien (40) relié à l'un des éléments de chant (25) de la planche, et l'autre renfort longitudinal (32) étant maintenu en position par un élément de maintien (140) relié à l'autre élément de chant (26) de la planche, séparant ainsi le matériau injecté du noyau en trois parties, une partie centrale (36) et deux parties latérales (35,37).Gliding board according to one of the preceding claims, characterized in that it comprises two longitudinal reinforcing elements (31,32), one of the longitudinal reinforcements (31) being held in position by a holding element (40) connected to one of the edge elements (25) of the board, and the other longitudinal reinforcement (32) being held in position by a holding element (140) connected to the other edge element (26) of the board, thus separating the injected material from the core into three parts, a central part (36) and two lateral parts (35,37).
EP19201059.3A 2018-10-05 2019-10-02 Glideboard with injected core provided with longitudinal reinforcing elements Pending EP3632513A1 (en)

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FR1859252A FR3086868B1 (en) 2018-10-05 2018-10-05 HYBRID CORE INJECTED SKI

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EP3632513A1 true EP3632513A1 (en) 2020-04-08

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309403A2 (en) * 1987-09-25 1989-03-29 Atomic Skifabrik Alois Rohrmoser Method for producing a ski, and ski obtained by this method
FR2684012A1 (en) * 1991-11-22 1993-05-28 Rossignol Sa Shaped ski of non-rectangular cross-section
FR2696126A1 (en) * 1992-09-29 1994-04-01 Rossignol Sa Reinforcement securing during moulding of skis - user retaining piece, holding reinforcement, which contains magnets attracted to magnets in lower mould half, below ski sole plate
EP0729769A1 (en) * 1995-03-03 1996-09-04 Salomon S.A. Method of fabrication a structure by injection molding
EP1421978A1 (en) 2002-11-22 2004-05-26 Skis Rossignol S.A. Gliding board and it's method of manufacturing
EP1504796A1 (en) 2003-08-04 2005-02-09 Skis Rossignol S.A. Fabrication method for a board for snow sports with lateral reinforced elements
EP3315180A1 (en) * 2016-10-26 2018-05-02 Skis Rossignol Assembly of at least two structural elements of a snowboard edge, and snowboard including an edge made with such an assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309403A2 (en) * 1987-09-25 1989-03-29 Atomic Skifabrik Alois Rohrmoser Method for producing a ski, and ski obtained by this method
FR2684012A1 (en) * 1991-11-22 1993-05-28 Rossignol Sa Shaped ski of non-rectangular cross-section
FR2696126A1 (en) * 1992-09-29 1994-04-01 Rossignol Sa Reinforcement securing during moulding of skis - user retaining piece, holding reinforcement, which contains magnets attracted to magnets in lower mould half, below ski sole plate
EP0729769A1 (en) * 1995-03-03 1996-09-04 Salomon S.A. Method of fabrication a structure by injection molding
EP1421978A1 (en) 2002-11-22 2004-05-26 Skis Rossignol S.A. Gliding board and it's method of manufacturing
EP1504796A1 (en) 2003-08-04 2005-02-09 Skis Rossignol S.A. Fabrication method for a board for snow sports with lateral reinforced elements
EP3315180A1 (en) * 2016-10-26 2018-05-02 Skis Rossignol Assembly of at least two structural elements of a snowboard edge, and snowboard including an edge made with such an assembly

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FR3086868A1 (en) 2020-04-10

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