WO2009156672A2 - Skateboard and method of manufacturing the board - Google Patents

Skateboard and method of manufacturing the board Download PDF

Info

Publication number
WO2009156672A2
WO2009156672A2 PCT/FR2009/051028 FR2009051028W WO2009156672A2 WO 2009156672 A2 WO2009156672 A2 WO 2009156672A2 FR 2009051028 W FR2009051028 W FR 2009051028W WO 2009156672 A2 WO2009156672 A2 WO 2009156672A2
Authority
WO
WIPO (PCT)
Prior art keywords
core
board
skins
fibers
sheet
Prior art date
Application number
PCT/FR2009/051028
Other languages
French (fr)
Other versions
WO2009156672A3 (en
Inventor
Olivier Duthoit
Original Assignee
Olivier Duthoit
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 Olivier Duthoit filed Critical Olivier Duthoit
Publication of WO2009156672A2 publication Critical patent/WO2009156672A2/en
Publication of WO2009156672A3 publication Critical patent/WO2009156672A3/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C17/00—Roller skates; Skate-boards
    • A63C17/01—Skateboards
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C17/00—Roller skates; Skate-boards
    • A63C17/01—Skateboards
    • A63C17/017—Production or mounting thereof
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C2203/00—Special features of skates, skis, roller-skates, snowboards and courts
    • A63C2203/42—Details of chassis of ice or roller skates, of decks of skateboards

Definitions

  • the present invention relates to a skateboard and its method of manufacture.
  • Skateboarding is commonly used for both leisure and physical activity; it can simply be used as a means of transportation locomotion; however, it is more commonly used for sports, with skateboarders performing acrobatic tricks on specially designed tracks.
  • the skateboard is frequently subjected to torsion, bending, and shearing stresses, as well as friction of its underside and its peripheral edge on the walls of the track, the skateboarder being able to for example drag his board on a rim of the track, or jump jumping by exerting significant constraints on the board to take off it to cross the obstacle or even to come into contact with the edge of the track.
  • the skateboards in particular have a board strictly speaking, on the upper face of which the rider has his feet, and a system of wheels fixed on the underside of said board.
  • the board has a longitudinal shape with at least its rounded front end, and at least its rear end bent upwards to allow the skateboarder to bear on it with one of his feet and to make figures even brake the board.
  • This board has a laminated wood texture, including maple wood, consisting for example of seven to nine layers with a cross-fiber orientation, said layers being bonded together.
  • These types of boards are good value for money.
  • they have the disadvantage of breaking quickly because they are subject to permanent shocks during a sport.
  • Such a board structure is, in particular, subjected to a shear phenomenon eventually leading to poor restitution of energy when the skateboarder wishes to make figures; the board loses its nervousness, that is to say that it therefore reacts more properly when making jumps.
  • the impacts experienced by the board generate impacts on the periphery thereof; this board is also subject to deformations during the production of the figures, which result in delamination of the layers of the board at its impacts.
  • a board comprising a structure consisting of a core or a core and two skins; both skins cover the upper and lower sides of the soul.
  • the core is made of a polycarbonate material optionally filled with glass fibers, while the skins consist of a layer of glass fibers impregnated with resin.
  • FR-2,772,624 it is further provided according to this document FR-2,772,624 to have a reinforcing structure on the periphery of the board and possibly in a central position, this structure to improve the nervousness of the board, that is to say its ability to restore energy during a given pulse on said board to make a jump.
  • Such a design does not provide satisfactory cohesion between the core and the two skins due to adhesion problems between the polycarbonate and the resin.
  • the board is therefore subject to delamination between layers.
  • such a board design has the disadvantage of increasing its weight compared to traditional wooden boards.
  • the structure of the board is also composed of a soul and two skins.
  • the core is made of a low density material such as wood or foam of synthetic material, and the two skins are made of resin-impregnated fibers.
  • This board further comprises a damping strip disposed on the periphery between the two skins, for the purpose of damping shocks and vibrations.
  • This board design generates a rapid delamination between the various layers constituting it. Moreover, such a design increases the weight of the board compared to traditional wooden boards.
  • the board comprises an outer surface, forming an upper skin and a lower skin, consisting of a layer of resin-impregnated fibers, this outer surface being filled with a foam constituting a core.
  • the board has a reinforcement structure disposed on the outer periphery of the board, or even in the central part.
  • This reinforcing structure consists of longitudinal tubular elements and elements disposed at the ends, said tubular elements being made of fibers having a high modulus of elongation, these tubular elements being further filled with a low density foam.
  • Such a design increases the longitudinal rigidity of the board and increase its nervousness.
  • the impacts caused on the periphery of the board during shocks thereof on the track have the effect of rapidly attacking the reinforcing structure and then generating delamination of the skin at these impacts, in particular due to the frequency of deformation of the board during practice.
  • the object of the present invention is to implement a board design alternative whose purpose in particular is to reduce the weight of the board and especially to reduce or even eliminate delamination problems. between the soul and the skins. It is also intended to facilitate the implementation of said board.
  • the skateboard comprises a longitudinal-shaped board, and a roller system attached to the underside of said longitudinal board.
  • This longitudinal board consists of a so-called sandwich structure composed of a core and two skins, one of the skins, said upper, being disposed above the core, while the other skin, said lower , is arranged below the soul.
  • the board also comprises a reinforcing structure disposed at least on the outer periphery of the core of the sandwich structure.
  • the core consists of at least one foamed sheet and the skins are each constituted by a cross-fiber sheet, said cross-fiber sheets being impregnated with a thermosetting resin.
  • the reinforcing structure consists of a bead consisting of a flexible sheath of woven fibers, and longitudinal fibers disposed within this flexible sheath, said bead being impregnated with the resin of the upper and lower skins.
  • This design makes it possible to have a perfect cohesion between the two skins and the cord forming an outer envelope constituted by the sheets of crossed fibers, the cord and the resin which impregnates the aforementioned elements.
  • the two skins remain in permanent bond through the resin impregnated in the cord, while the core foam, low density, keeps the two skins spaced apart by preventing the resin from spreading throughout the volume of said board, which reduces the weight of the board and makes it possible to approach the structures of traditional wooden boards remarkably, by eliminating the problems of delamination.
  • the foam sheet comprises small channels passing through it over its thickness, these channels being arranged to allow the passage of the resin before curing, which allows to create a bond between the upper skin and the lower skin passing through the core.
  • This design therefore helps to avoid the delamination of the board and especially increases the resistance thereof to shear stresses.
  • small channels openings opening through the foam sheet, the holes being distributed over said foam sheet.
  • These small channels may, however, consist of thin slots arranged longitudinally on the foam sheet and passing therethrough.
  • the core consists of a sheet based on foam and needled fibers or staked in this foam. Such needling or picketing allows for small channels through the foam, opening on both sides of the sheet, the fibers passing through said channels.
  • the channels allow the passage of the resin to ensure a connection between the upper and lower skins.
  • the presence of fibers in the foam increases the strength of the plank structure against shear stresses and improves cohesion between the skins and the core.
  • the needled or staked fibers are positioned more or less vertically through the foam, the ends of these fibers protruding from said foam, which ensures a bonding of these fibers with the cross-fiber sheets which are arranged in a plane in particular horizontal, perpendicular to the fibers arranged in the foam.
  • the foam sheet has small surface grooves on at least one of its faces, upper or lower. These grooves preferably form a grid on said face; they are arranged to ensure a uniform distribution of the resin over the entire surface of the skin.
  • the cross-fiber sheets of the two skins are in contact with the foam sheet constituting the core; the pressure exerted on the sheets of the crossed fibers in contact with the foam sheet may compress said cross-fiber sheets and tighten the interstices existing between the cross-fibers, said interlocking interstices preventing the resin from impregnating properly through the cross-fiber sheet.
  • the presence of the grooves on the surface of the foam sheet is a network of channels that will allow the distribution and distribution of the resin on the entire surface.
  • the resin covers the cord and impregnated in it because of its texture, which ensures a cohesion of the cord with the peripheral outlines of cross-fiber sheets of the upper and lower skins.
  • the bead comprises a width of between 10 mm and 50 mm.
  • the cord comprises a form of rope provided with two ends, said ends comprising fastening means arranged to join said ends when the cord is arranged around the core, which ensures that they remain in position one of the two ends. relative to each other so that the bead remains securely closed and in position around the core.
  • this core comprises a thickness of between 5 mm and 10 mm, the foam used for the core being chosen from polyethylene, polyurethane, PVC and PET.
  • the resin used for the skin is preferably a resin of the epoxy, polyester, vinylester or polyurethane type.
  • the reinforcing structure comprises a longitudinal reinforcement which extends between the rear and front ends of the longitudinal board, which is similar in design to the cord.
  • the board optionally comprises at least one draping strip or sheath, transversely wrapping a portion of the cross-fiber sheets of the two skins and a portion of the cord and the core; this band or sheath is also impregnated with the resin. It allows to improve punctually along the board, especially in areas where it undergoes significant deformations during practice, the resistance against shear stresses.
  • the draping strips or sheaths are arranged in these important deformation zones. These draping strips or sheaths are preferably made of woven fibers, for example, similar to those used for forming the sheath of the cord.
  • the invention also relates to the method of manufacturing the longitudinal board constituting the skateboard according to the invention.
  • the process consists of:
  • Such a method has the advantage of allowing easy implementation of the skateboard.
  • - Figure 2 shows a portion of the cord in particular in the area of the ends subject to each other;
  • - Figure 3 partially shows a foam-based sheet used for the soul, highlighting the presence of channels;
  • FIG. 4 shows a foam sheet used for the core having on one of its faces grooves forming a grid
  • FIG. 5 shows a foam-based sheet and needled or staked glass fibers used to form the core, according to a variant.
  • the skateboard according to the present invention comprises a board 1 having a longitudinal shape.
  • This board is arranged to receive a wheel system intended to be fixed on the underside of said board.
  • the board 1 consists of a core 2 and two skins 3,4, the first skin 3 being disposed above the core while the second skin 4 is disposed below blade.
  • Such a board structure is commonly referred to as a sandwich structure.
  • the board 1 has a reinforcing structure constituted by a cord 5, illustrated in this figure 1.
  • This cord 5 has, after its positioning around the core 2, a shape similar to that of the board . It can be seen in FIG. 1 that the board has at its front ends 6 and rear 7 an upward curved portion on which the skateboarder can rest with the feet in order to perform figures or acrobatics.
  • the skins 3,4 consist of a sheet of crossed fibers and arranged in the horizontal direction, the cross-fiber sheet being impregnated with a thermosetting resin.
  • the fibers used for forming the cross-fiber sheet are glass fibers.
  • other types of fibers such as carbon fibers and aramid fibers, may be used.
  • the thermosetting resin used for the constitution of the skin is chosen from epoxy resins, polyester resins, vinylester resins and polyurethane resins.
  • the bead 5 consists of a sheath 8 and longitudinal fibers 9.
  • This sheath 8 is flexible and made of woven fibers. This sheath makes it possible to maintain and facilitate the handling of the longitudinal fibers 9 that it contains.
  • the use of woven fibers for the constitution of this sheath 8 allows the resin to easily impregnate into the bead.
  • the longitudinal fibers 9 strengthen the rigidity of the board 1 and improve the nervousness thereof. These longitudinal fibers 9 disposed inside the sheath 8, are therefore also impregnated with the resin.
  • the longitudinal fibers 9 used for the design of the bead 5 are fibers selected from glass fibers, carbon fibers, aramid fibers or even vegetable fibers such as linen.
  • the core 2 of the board 1 consists of a flexible foamed sheet whose variants are illustrated in FIGS. 3 to 5.
  • This sheet of foam comprises channels 10 illustrated in FIGS. 3 to 5.
  • the channels 10 are opening and arranged in the direction of the thickness of the sheet, which allow the resin to infiltrate punctually through the thickness of the core sheet, which ensures a connection between the upper skin 3 and the skin lower 4.
  • the channels have the shape of a small hole or hole through the thickness of the sheet.
  • design variants for these channels in particular in the form of slight slots arranged in the longitudinal direction of the sheet and passing through its thickness.
  • the sheet has grooves 11 arranged on the surface, and preferably forming a grid on said surface. These grooves 11 constitute channels allowing the resin to spread on the surface through said channels and to impregnate the entire surface of the crossed fiber sheets.
  • such grooves 11 are shown on the upper face 12; however, it is possible to provide similar grooves on the lower face 13, or preferably on both faces 12, 13 simultaneously.
  • the core 2 of the board consists of a sheet made of foam 14 and fibers 15, these fibers 15 being needled or staked through the foam 14 so as to they are arranged substantially in the direction of the thickness of the sheet.
  • the needling or picketing allows for channels 10 similar to those illustrated in FIGS. 3 and 4, within which the needled or stitched fibers are arranged.
  • These fibers will preferably be glass fibers; however, any other type of fiber such as carbon fibers or aramid fibers may be provided.
  • Such needling makes it possible to have a web sheet whose ends 16 of the fibers 17 protrude from the foam 14, which guarantees the attachment of these fibers 17 with the cross-fibers of the skins 3,4 arranged horizontally above and below.
  • this foam chosen for the core sheet 2 is a foam of the polyethylene, polyurethane, PVC or PET type.
  • the foam-based sheet, optionally provided with needled fibers, and the cross-fiber sheets are soft in their initial state. These are therefore cut by means of a pattern so as to form the longitudinal shape with the rounded ends of the board 1.
  • the dimensions of the crossed fiber sheets for the constitution of the skins 3,4 are cut to slightly larger dimensions than those of the foam-based sheet constituting the core 2.
  • the cord 5, disposed on the outer periphery 18 of the core 2, that is to say of the foam sheet, is partially covered on its upper side 19 and on its side lower 20 by the crossed fiber sheets constituting the upper and lower skins respectively 4.
  • the first flexible cross-fiber sheet is placed inside the imprint of the lower die, said sheet conforming to the shape of said imprint.
  • the foamed sheet also flexible, is placed above said cross-fiberglass sheet. It is then necessary to arrange the cord 5 around the foam sheet, said cord 5 conforming to the peripheral edge of said foam sheet and projecting with respect to the peripheral contour 21 of the cross-fiber sheet.
  • the upper and lower die imprints of the mold may provide means for positioning and / or maintaining said bead 5, which will facilitate its positioning.
  • the second cross-fiber sheet is placed on top of the foam-based sheet and over the bead protruding from the peripheral contour 22 of said second sheet.
  • thermosetting resin the latter impregnated into the cross-fiber sheets homogeneously on the lower skin and on the upper skin .
  • this resin infiltrates through the channels 10 in the foam sheet or possibly propagates through the grooves 11 on said sheet.
  • This resin is also impregnated in the bead 5 passing through the interstices of the woven fibers constituting the sheath 8, to then impregnate the longitudinal fibers 9.
  • the cord 5 has in the normal state, that is to say before constitution of the board 1, a circular shape.
  • its design as described above gives it flexibility and flexibility to to arrange properly around the soul.
  • its flexibility allows crushing when closing the mold.
  • the diameter of the bead is determined in order to obtain, after being crushed, once placed inside the mold, a width of between 10 and 50 mm, while its thickness will be slightly greater than that of the core. 2, because of this crash.
  • the cord 5 in the normal state has a diameter of 5 to 40 mm to obtain after crushing a bead width of the order of 10 to 50 mm.
  • a core 2 comprising a thickness of between 5 mm and 10 mm is preferably used, the thickness of the two skins 3,4 being complementary so as to obtain a total thickness of the board 1 equal to at least 10 mm. , meeting the manufacturing standards as planned in France.
  • the cord 5 is in the form of a rope provided with two ends 23, 24 shown in Figure 2, the length of the rope corresponding to the length of the peripheral perimeter of the soul 2.
  • these ends 23,24 of the rope are complementary, that is to say that they are arranged to cooperate during their meeting once positioned around the sheet made of foam and fibers needled glass.
  • the ends 25, 26 of the longitudinal fibers 9 preferably have a half-wood cut as illustrated in FIG. 5, which has the advantage of interleaving the ends 25, 26 of the longitudinal fibers while increasing the surface area. contact between the two ends 25,26.
  • Other securing means may, however, be provided such as the creation of a splice between the two. ends 16,17.
  • the reinforcing structure also comprises a central reinforcement disposed longitudinally on the board, either on the upper side and on the lower side around the core, or directly integrated in the longitudinal central portion thereof; in this case, the core consists of two portions of foamed sheet, optionally comprising needled fibers.
  • This longitudinal central reinforcement extends on both sides of the front and rear ends of the board.
  • a draping strip or a piece of sheath arranged transversely on the board, this draping strip enveloping the core 2, the cord 5 and the two cross-fiber sheets constituting the two skins 3 , 4, this band being also impregnated with resin.
  • Such a band has the function of improving the rigidity of the board in specific areas, especially areas of the board which are subject to significant deformations during the realization of jumps, that is to say the areas in particular located near the curved portions.
  • these drapery strips or pieces of sheath are made of woven fibers, identical to those used for forming the sheath of the cord.
  • fibers of different composition for these draping strips or pieces of sheath.

Landscapes

  • Laminated Bodies (AREA)

Abstract

The present invention relates to a skateboard comprising a board (1) of longitudinal shape and a roller system fixed to the underside of the board (1). This board (1) has what is called a "sandwich" structure made up of a core (2) and two skins (3, 4) placed above and below the core (2) respectively and has a reinforcing structure placed on the perimeter of the core (1). The core (2) comprises a foam-based sheet (10) and the two skins (3, 4) each comprise a crossed-fibre sheet, said crossed-fibre sheets being impregnated with a thermosetting resin. The reinforcing structure consists of a bead (5) comprising a flexible sheath (8) made of woven fibres and of longitudinal fibres (9) placed on the inside of this sheath (8), said bead (5) being impregnated with the thermosetting resin of the upper (3) and lower (4) skins.

Description

PLANCHE A ROULETTES ET PROCEDE DE FABRICATION DE LA PLANCHE ROLLER BOARD AND METHOD OF MANUFACTURING THE BOARD
La présente invention porte sur une planche à roulettes, ainsi que sur son procédé de fabrication.The present invention relates to a skateboard and its method of manufacture.
Elle trouvera tout particulièrement son application pour la pratique de cette activité sportive, plus couramment appelée « skateboard ». En outre, elle sera mise en œuvre par les fabricants d'équipements sportifs et sera commercialisée dans les surfaces de vente de tels équipements sportifs. La pratique de la planche à roulettes est couramment répandue tant pour les loisirs que pour la pratique d'activité physique ; celle-ci peut tout simplement être utilisée comme moyen de locomotion pour les déplacements ; cependant, elle est plus couramment utilisée pour une pratique sportive, les planchistes réalisant notamment des figures acrobatiques sur des pistes spécialement conçues à cet effet. Dans ce second cas, la planche à roulettes est fréquemment soumise à des contraintes de torsion, de flexion, et de cisaillement, ainsi qu'à des frottements de sa face inférieure et de son bord périphérique sur des parois de la piste, le planchiste pouvant par exemple faire glisser sa planche sur un rebord de la piste, voire faire des sauts d'obstacle en exerçant des contraintes importantes sur la planche permettant de décoller celle-ci pour franchir ledit obstacle voire pour venir au contact dudit rebord de piste.It will particularly find its application for the practice of this sporting activity, more commonly known as "skateboarding". In addition, it will be implemented by the manufacturers of sports equipment and will be marketed in the sales areas of such sports equipment. Skateboarding is commonly used for both leisure and physical activity; it can simply be used as a means of transportation locomotion; however, it is more commonly used for sports, with skateboarders performing acrobatic tricks on specially designed tracks. In this second case, the skateboard is frequently subjected to torsion, bending, and shearing stresses, as well as friction of its underside and its peripheral edge on the walls of the track, the skateboarder being able to for example drag his board on a rim of the track, or jump jumping by exerting significant constraints on the board to take off it to cross the obstacle or even to come into contact with the edge of the track.
Les planches à roulettes disposent notamment d'une planche à proprement parler, sur la face supérieure de laquelle le planchiste dispose ses pieds, et d'un système de roulettes fixé sur la face inférieure de ladite planche. La planche dispose d'une forme longitudinale avec au moins son extrémité avant de forme arrondie, et au moins son extrémité arrière recourbée vers le haut pour permettre au planchiste de prendre appui sur celle-ci avec l'un de ses pieds et réaliser des figures voire freiner la planche. Cette planche dispose d'une texture en bois lamellée, notamment du bois d'érable, constituée par exemple de sept à neuf couches avec une orientation des fibres croisées, lesdites couches étant collées entre elles. Ces types de planches ont un bon rapport qualité/prix. Toutefois, elles ont pour inconvénient de casser rapidement du fait qu'elles sont soumises à des chocs permanents lors d'une pratique sportive. Une telle structure de planche est, en particulier, soumise à un phénomène de cisaillement entraînant à terme une mauvaise restitution de l'énergie lorsque le planchiste souhaite réaliser des figures ; la planche perd de sa nervosité, c'est-à-dire qu'elle ne réagit par conséquent plus convenablement lors de la réalisation de sauts.The skateboards in particular have a board strictly speaking, on the upper face of which the rider has his feet, and a system of wheels fixed on the underside of said board. The board has a longitudinal shape with at least its rounded front end, and at least its rear end bent upwards to allow the skateboarder to bear on it with one of his feet and to make figures even brake the board. This board has a laminated wood texture, including maple wood, consisting for example of seven to nine layers with a cross-fiber orientation, said layers being bonded together. These types of boards are good value for money. However, they have the disadvantage of breaking quickly because they are subject to permanent shocks during a sport. Such a board structure is, in particular, subjected to a shear phenomenon eventually leading to poor restitution of energy when the skateboarder wishes to make figures; the board loses its nervousness, that is to say that it therefore reacts more properly when making jumps.
En outre, les chocs que subit la planche génèrent des impacts sur le pourtour de celle-ci ; cette planche est de plus soumise à des déformations lors de la réalisation des figures, lesquelles entraînent un délaminage des couches de la planche au niveau de ses impacts.In addition, the impacts experienced by the board generate impacts on the periphery thereof; this board is also subject to deformations during the production of the figures, which result in delamination of the layers of the board at its impacts.
Les équipementiers ont donc développé de nouvelles textures de planches en matériaux composites notamment dans le but de remédier à ce phénomène de cisaillement.OEMs have therefore developed new textures of boards made of composite materials, particularly in order to remedy this shearing phenomenon.
De telles planches sont notamment décrites dans les documents FR- 2.772.624, FR-2.848.868 et US-2003/0222420.Such boards are described in particular in documents FR-2,772,624, FR-2,848,868 and US-2003/0222420.
Selon le document FR-2.772.624, il est décrit une planche comprenant une structure composée d'une âme ou d'un noyau et de deux peaux ; les deux peaux revêtent le côté supérieur et le côté inférieur de l'âme. Selon ce document, l'âme est constituée d'un matériau polycarbonate éventuellement chargé en fibres de verre, tandis que les peaux sont constituées d'une couche de fibres de verre imprégnée de résine.According to the document FR-2,772,624, there is described a board comprising a structure consisting of a core or a core and two skins; both skins cover the upper and lower sides of the soul. According to this document, the core is made of a polycarbonate material optionally filled with glass fibers, while the skins consist of a layer of glass fibers impregnated with resin.
Il est en outre prévu selon ce document FR-2.772.624 de disposer une structure de renfort sur le pourtour de la planche et éventuellement en position centrale, cette structure permettant d'améliorer la nervosité de la planche, c'est-à-dire son aptitude à restituer l'énergie lors d'une impulsion donnée sur ladite planche afin de réaliser un saut.It is further provided according to this document FR-2,772,624 to have a reinforcing structure on the periphery of the board and possibly in a central position, this structure to improve the nervousness of the board, that is to say its ability to restore energy during a given pulse on said board to make a jump.
Une telle conception ne procure pas une cohésion satisfaisante entre l'âme et les deux peaux du fait des problèmes d'adhérence entre le polycarbonate et la résine. La planche est donc sujette à un délaminage entre les couches. Par ailleurs, une telle conception de planche a pour inconvénient d'augmenter son poids par rapport aux planches traditionnelles en bois.Such a design does not provide satisfactory cohesion between the core and the two skins due to adhesion problems between the polycarbonate and the resin. The board is therefore subject to delamination between layers. Moreover, such a board design has the disadvantage of increasing its weight compared to traditional wooden boards.
Selon le document FR-2.848.868, la structure de la planche est composée également d'une âme et de deux peaux. Selon ce document, l'âme est constituée d'un matériau de faible densité tel que du bois ou de la mousse de matière synthétique, et les deux peaux sont constituées de fibres imprégnées de résine. Cette planche comprend en outre une bande d'amortissement disposée sur le pourtour entre les deux peaux, dans le but d'amortir les chocs et les vibrations. Cette conception de planche engendre un délaminage rapide entre les différentes couches la constituant. Par ailleurs, une telle conception augmente le poids de la planche par rapport aux planches traditionnelles en bois.According to the document FR-2.848.868, the structure of the board is also composed of a soul and two skins. According to this document, the core is made of a low density material such as wood or foam of synthetic material, and the two skins are made of resin-impregnated fibers. This board further comprises a damping strip disposed on the periphery between the two skins, for the purpose of damping shocks and vibrations. This board design generates a rapid delamination between the various layers constituting it. Moreover, such a design increases the weight of the board compared to traditional wooden boards.
Selon le document US-2003/0222420, la planche comprend une surface extérieure, formant une peau supérieure et une peau inférieure, constituée d'une couche de fibres imprégnées de résine, cette surface extérieure étant remplie d'une mousse constituant une âme. Selon ce document, il est prévu un mode de réalisation selon lequel la planche dispose d'une structure de renfort disposée sur le pourtour extérieur de la planche, voire également en partie centrale. Cette structure de renfort est constituée d'éléments tubulaires longitudinaux et d'éléments disposés aux extrémités, lesdits éléments tubulaires étant constitués de fibres présentant un module d'élongation élevée, ces éléments tubulaires étant en outre remplis d'une mousse basse densité. Une telle conception permet d'accroître la rigidité longitudinale de la planche et d'augmenter sa nervosité. Selon cette conception, les impacts occasionnés sur le pourtour de la planche lors de chocs de celle-ci sur la piste, ont pour effet d'attaquer rapidement la structure de renfort puis de générer un délaminage de la peau au niveau de ces impacts, notamment du fait de la fréquence de déformation de la planche au cours de la pratique.According to US-2003/0222420, the board comprises an outer surface, forming an upper skin and a lower skin, consisting of a layer of resin-impregnated fibers, this outer surface being filled with a foam constituting a core. According to this document, there is provided an embodiment according to which the board has a reinforcement structure disposed on the outer periphery of the board, or even in the central part. This reinforcing structure consists of longitudinal tubular elements and elements disposed at the ends, said tubular elements being made of fibers having a high modulus of elongation, these tubular elements being further filled with a low density foam. Such a design increases the longitudinal rigidity of the board and increase its nervousness. According to this design, the impacts caused on the periphery of the board during shocks thereof on the track, have the effect of rapidly attacking the reinforcing structure and then generating delamination of the skin at these impacts, in particular due to the frequency of deformation of the board during practice.
La présente invention a pour objet de mettre en œuvre une alternative de conception de planche ayant notamment pour but de réduire le poids de la planche et surtout de réduire voire de supprimer les problèmes de délaminage entre l'âme et les peaux. Elle a également pour but de faciliter la mise en œuvre de ladite planche.The object of the present invention is to implement a board design alternative whose purpose in particular is to reduce the weight of the board and especially to reduce or even eliminate delamination problems. between the soul and the skins. It is also intended to facilitate the implementation of said board.
Selon l'invention, la planche à roulettes comprend une planche de forme longitudinale, et un système à roulettes fixé sur la face inférieure de ladite planche longitudinale. Cette planche longitudinale est constituée d'une structure dite en sandwich composée d'une âme et de deux peaux, l'une des peaux, dite supérieure, étant disposée au-dessus de l'âme, tandis que l'autre peau, dite inférieure, est disposée en dessous de l'âme. La planche comprend également une structure de renfort disposée au moins sur le pourtour extérieur de l'âme de la structure en sandwich. En outre, l'âme est constituée au moins d'une feuille à base de mousse et les peaux sont constituées chacune d'une feuille de fibres croisées, lesdites feuilles de fibres croisées étant imprégnées d'une résine thermodurcissable. La structure de renfort consiste quant à elle en un cordon constitué d'une gaine flexible en fibres tissées, et de fibres longitudinales disposées à l'intérieur de cette gaine flexible, ledit cordon étant imprégné par la résine des peaux supérieure et inférieure.According to the invention, the skateboard comprises a longitudinal-shaped board, and a roller system attached to the underside of said longitudinal board. This longitudinal board consists of a so-called sandwich structure composed of a core and two skins, one of the skins, said upper, being disposed above the core, while the other skin, said lower , is arranged below the soul. The board also comprises a reinforcing structure disposed at least on the outer periphery of the core of the sandwich structure. In addition, the core consists of at least one foamed sheet and the skins are each constituted by a cross-fiber sheet, said cross-fiber sheets being impregnated with a thermosetting resin. The reinforcing structure consists of a bead consisting of a flexible sheath of woven fibers, and longitudinal fibers disposed within this flexible sheath, said bead being impregnated with the resin of the upper and lower skins.
Cette conception permet d'avoir une parfaite cohésion entre les deux peaux et le cordon formant une enveloppe externe constituée par les feuilles de fibres croisées, le cordon et la résine qui imprègne lesdits précédents éléments. Ainsi, lors d'impacts occasionnés sur le pourtour de la planche, notamment au niveau du cordon, les deux peaux restent en liaison permanente par le biais de la résine imprégnée dans le cordon, tandis que la mousse d'âme, de faible densité, permet de maintenir espacées les deux peaux en empêchant la résine de se répandre dans tout le volume de ladite planche, ce qui réduit le poids de la planche et permet de s'approcher remarquablement des structures de planches traditionnelles en bois, en supprimant les problèmes de délaminage.This design makes it possible to have a perfect cohesion between the two skins and the cord forming an outer envelope constituted by the sheets of crossed fibers, the cord and the resin which impregnates the aforementioned elements. Thus, during impacts on the periphery of the board, particularly at the cord, the two skins remain in permanent bond through the resin impregnated in the cord, while the core foam, low density, keeps the two skins spaced apart by preventing the resin from spreading throughout the volume of said board, which reduces the weight of the board and makes it possible to approach the structures of traditional wooden boards remarkably, by eliminating the problems of delamination.
Une telle conception permet avantageusement de supprimer les risques de délaminage entre la couche d'âme et les peaux lors d'une usure du pourtour de la planche toute en augmentant la rigidité et la nervosité de la planche. De manière préférentielle, la feuille de mousse comprend des petits canaux traversant celle-ci sur son épaisseur, ces canaux étant agencés pour permettre le passage de la résine avant son durcissement, ce qui permet de créer une liaison entre la peau supérieure et la peau inférieure en passant au travers de l'âme. Cette conception contribue donc à éviter le délaminage de la planche et surtout augmente la résistance de celle-ci aux contraintes de cisaillement.Such a design advantageously eliminates the risk of delamination between the core layer and the skin during wear around the edge of the board while increasing the rigidity and nervousness of the board. Preferably, the foam sheet comprises small channels passing through it over its thickness, these channels being arranged to allow the passage of the resin before curing, which allows to create a bond between the upper skin and the lower skin passing through the core. This design therefore helps to avoid the delamination of the board and especially increases the resistance thereof to shear stresses.
On entend par petits canaux, des trous débouchant traversant la feuille de mousse, les trous étant répartis sur ladite feuille de mousse. Ces petits canaux peuvent toutefois consister en des fines fentes disposées longitudinalement sur la feuille de mousse et traversant celle-ci. Selon une variante, l'âme est constituée d'une feuille à base de mousse et de fibres aiguilletées ou piquetées dans cette mousse. Un tel aiguilletage ou piquetage permet de réaliser des petits canaux au travers de la mousse, débouchant de part et d'autre de la feuille, les fibres passant au travers desdits canaux. Ainsi, les canaux permettent le passage de la résine afin d'assurer une liaison entre les peaux supérieure et inférieure. En outre, la présence de fibres dans la mousse augmente la résistance de la structure de planche contre les contraintes de cisaillement et améliore la cohésion entre les peaux et l'âme. En effet, les fibres aiguilletées ou piquetées sont positionnées plus ou moins verticalement au travers de la mousse, les extrémités de ces fibres dépassant de ladite mousse, ce qui assure un accrochage de ces fibres avec les feuilles de fibres croisées qui sont disposées dans un plan notamment horizontal, perpendiculairement par rapport aux fibres disposées dans la mousse.By small channels are meant openings opening through the foam sheet, the holes being distributed over said foam sheet. These small channels may, however, consist of thin slots arranged longitudinally on the foam sheet and passing therethrough. According to one variant, the core consists of a sheet based on foam and needled fibers or staked in this foam. Such needling or picketing allows for small channels through the foam, opening on both sides of the sheet, the fibers passing through said channels. Thus, the channels allow the passage of the resin to ensure a connection between the upper and lower skins. In addition, the presence of fibers in the foam increases the strength of the plank structure against shear stresses and improves cohesion between the skins and the core. Indeed, the needled or staked fibers are positioned more or less vertically through the foam, the ends of these fibers protruding from said foam, which ensures a bonding of these fibers with the cross-fiber sheets which are arranged in a plane in particular horizontal, perpendicular to the fibers arranged in the foam.
De manière préférentielle, la feuille de mousse dispose de petites rainures en surface sur au moins une de ses faces, supérieure ou inférieure. Ces rainures forment de préférence un quadrillage sur ladite face ; elles sont agencées pour garantir une répartition uniforme de la résine sur toute la surface de la peau. En effet, lors de la réalisation de la planche, tel qu'il le sera décrit ultérieurement dans la description, les feuilles de fibres croisées des deux peaux sont au contact de la feuille de mousse constituant l'âme ; la pression exercée sur les feuilles des fibres croisées au contact de la feuille de mousse peut compresser lesdites feuilles de fibres croisées et resserrer les interstices existant entre les fibres croisées, ledit resserrage des interstices empêchant la résine de s'imprégner convenablement au travers de la feuille de fibres croisées. La présence des rainures en surface sur la feuille de mousse constitue un réseau de canaux qui vont permettre la distribution et la répartition de la résine sur toute la surface.Preferably, the foam sheet has small surface grooves on at least one of its faces, upper or lower. These grooves preferably form a grid on said face; they are arranged to ensure a uniform distribution of the resin over the entire surface of the skin. Indeed, during the realization of the board, as will be described later in the description, the cross-fiber sheets of the two skins are in contact with the foam sheet constituting the core; the pressure exerted on the sheets of the crossed fibers in contact with the foam sheet may compress said cross-fiber sheets and tighten the interstices existing between the cross-fibers, said interlocking interstices preventing the resin from impregnating properly through the cross-fiber sheet. The presence of the grooves on the surface of the foam sheet is a network of channels that will allow the distribution and distribution of the resin on the entire surface.
De manière préférentielle, le contour périphérique de la feuille de fibres de verre croisées de la peau supérieure et celui de la peau inférieure recouvrent partiellement, respectivement le côté supérieur et le côté inférieur du cordon. Ainsi, seul ledit cordon vient au contact des surfaces externes, ce qui nécessite une usure préalable dudit cordon avant de pouvoir user dans un second temps lesdites peaux. Par ailleurs, la résine recouvre le cordon et s'imprègne dans celui-ci du fait de sa texture, ce qui assure une cohésion du cordon avec les contours périphériques des feuilles de fibres croisées des peaux supérieure et inférieure. De manière préférentielle, le cordon comprend une largeur comprise entre 10 mm et 50 mm. Une telle largeur permet de garantir que, lorsque ledit cordon sera usé, la planche aura atteint un seuil d'usure général, notamment dans les zones où les pieds du planchiste viennent en contact sur la surface supérieure, nécessitant le remplacement de ladite planche. De manière remarquable, le cordon comprend une forme de corde munie de deux extrémités, lesdites extrémités comprenant des moyens d'assujettissements agencés pour joindre lesdites extrémités lorsque la corde est disposée autour de l'âme, ce qui garantit leur maintien en position l'une par rapport à l'autre de manière à ce que le cordon reste bien fermé et en position autour de l'âme.Preferably, the peripheral contour of the cross-fiberglass sheet of the upper skin and that of the lower skin overlap partially, respectively the upper side and the lower side of the cord. Thus, only said cord comes into contact with external surfaces, which requires prior wear of said cord before being able to use in a second time said skins. In addition, the resin covers the cord and impregnated in it because of its texture, which ensures a cohesion of the cord with the peripheral outlines of cross-fiber sheets of the upper and lower skins. Preferably, the bead comprises a width of between 10 mm and 50 mm. Such a width ensures that when said cord is worn, the board has reached a general wear threshold, especially in areas where the feet of the snowboarder come into contact with the upper surface, requiring the replacement of said board. Remarkably, the cord comprises a form of rope provided with two ends, said ends comprising fastening means arranged to join said ends when the cord is arranged around the core, which ensures that they remain in position one of the two ends. relative to each other so that the bead remains securely closed and in position around the core.
De manière préférentielle, cette âme comprend une épaisseur comprise entre 5 mm et 10 mm, la mousse utilisée pour l'âme étant choisie parmi le polyéthylène, le polyuréthane, le PVC et le PET. Par ailleurs, la résine utilisée pour la peau est, de préférence, une résine du type époxy, polyester, vinylester, polyuréthane. Selon une variante de conception, la structure de renfort comprend un renfort longitudinal qui s'étend entre les extrémités arrière et avant de la planche longitudinale, lequel est de conception similaire au cordon.Preferably, this core comprises a thickness of between 5 mm and 10 mm, the foam used for the core being chosen from polyethylene, polyurethane, PVC and PET. On the other hand, the resin used for the skin is preferably a resin of the epoxy, polyester, vinylester or polyurethane type. According to a variant of design, the reinforcing structure comprises a longitudinal reinforcement which extends between the rear and front ends of the longitudinal board, which is similar in design to the cord.
La planche comprend éventuellement au moins une bande de drapage ou une gaine, enveloppant transversalement une portion des feuilles de fibres croisées des deux peaux ainsi qu'une portion du cordon et de l'âme ; cette bande ou gaine est également imprégnée par la résine. Elle permet d'améliorer ponctuellement le long de la planche, notamment dans les zones où celle-ci subit des déformations importantes lors de la pratique, la résistance contre les contraintes de cisaillement. Pour cela, les bandes de drapage ou gaines sont disposées dans ces zones de déformation importantes. Ces bandes de drapage ou gaines sont de préférence réalisées en fibres tissées, par exemple, similaires à celles utilisées pour la constitution de la gaine du cordon.The board optionally comprises at least one draping strip or sheath, transversely wrapping a portion of the cross-fiber sheets of the two skins and a portion of the cord and the core; this band or sheath is also impregnated with the resin. It allows to improve punctually along the board, especially in areas where it undergoes significant deformations during practice, the resistance against shear stresses. For this, the draping strips or sheaths are arranged in these important deformation zones. These draping strips or sheaths are preferably made of woven fibers, for example, similar to those used for forming the sheath of the cord.
En outre, l'invention concerne également le procédé de fabrication de la planche longitudinale constitutive de la planche à roulettes selon l'invention. Le procédé consiste à :In addition, the invention also relates to the method of manufacturing the longitudinal board constituting the skateboard according to the invention. The process consists of:
- découper la feuille de mousse à base de fibres de verre aiguilletées constitutive de l'âme, et les deux feuilles de fibres de verre croisées constitutives des deux peaux inférieure et supérieure ; - à déposer la première feuille de fibres de verre croisées dans le moule ;- Cut the foam sheet of needled glass fibers constituting the core, and the two cross-fiberglass sheets constituting the two lower and upper skins; depositing the first sheet of crossed glass fibers in the mold;
- à déposer la feuille de mousse à base de fibres de verre aiguilletées au- dessus de ladite feuille de fibres de verre croisées ;depositing the needled fiberglass foam sheet above said cross-fiberglass sheet;
- à positionner le cordon autour de ladite feuille de mousse ;positioning the cord around said foam sheet;
- à déposer la seconde feuille de fibres de verre croisées de la peau supérieure au-dessus de la feuille de mousse et du cordon ; et à injecter la résine dans le moule.depositing the second cross-fiberglass sheet of the upper skin above the foam sheet and the cord; and injecting the resin into the mold.
Un tel procédé a pour avantage de permettre une mise en œuvre aisée de la planche à roulettes.Such a method has the advantage of allowing easy implementation of the skateboard.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre d'un mode préférentiel de conception de la planche, lequel s'appuie sur les figures parmi lesquelles : - la figure 1 présente une vue éclatée de la planche longitudinale constitutive de la planche à roulettes selon l'invention ;Other features and advantages of the present invention will appear on reading the following description of a preferred embodiment of the board design, which is based on the figures among which: - Figure 1 shows an exploded view of the longitudinal board constituting the skateboard according to the invention;
- la figure 2 présente une portion du cordon notamment dans la zone des extrémités assujetties l'une par rapport à l'autre ; - la figure 3 présente partiellement une feuille à base de mousse utilisée pour l'âme, mettant en évidence la présence de canaux ;- Figure 2 shows a portion of the cord in particular in the area of the ends subject to each other; - Figure 3 partially shows a foam-based sheet used for the soul, highlighting the presence of channels;
- la figure 4 présente une feuille de mousse utilisée pour l'âme présentant sur une de ses faces des rainures formant un quadrillage ;- Figure 4 shows a foam sheet used for the core having on one of its faces grooves forming a grid;
- la figure 5 présente une feuille à base de mousse et de fibres de verre aiguilletées ou piquetées utilisée pour constituer l'âme, selon une variante.- Figure 5 shows a foam-based sheet and needled or staked glass fibers used to form the core, according to a variant.
La planche à roulettes selon la présente invention comprend une planche 1 présentant une forme longitudinale. Cette planche est agencée pour recevoir un système à roulettes prévu pour être fixé sur la face inférieure de ladite planche. Telle qu'illustrée sur la figure 1, la planche 1 se compose d'une âme 2 et de deux peaux 3,4, la première peau 3 étant disposée au dessus de l'âme tandis que la seconde peau 4 est disposée en dessous de l'âme. Une telle structure de planche est couramment appelée structure en sandwich. En outre, la planche 1 dispose d'une structure de renfort constituée par un cordon 5, illustré sur cette figure 1. Ce cordon 5 dispose, après son positionnement autour de l'âme 2, d'une forme similaire à celle de la planche. On constate, sur la figure 1, que la planche dispose à ses extrémités avant 6 et arrière 7 d'une portion recourbée vers le haut sur laquelle le planchiste peut prendre appui avec les pieds afin de réaliser des figures ou acrobaties.The skateboard according to the present invention comprises a board 1 having a longitudinal shape. This board is arranged to receive a wheel system intended to be fixed on the underside of said board. As illustrated in Figure 1, the board 1 consists of a core 2 and two skins 3,4, the first skin 3 being disposed above the core while the second skin 4 is disposed below blade. Such a board structure is commonly referred to as a sandwich structure. In addition, the board 1 has a reinforcing structure constituted by a cord 5, illustrated in this figure 1. This cord 5 has, after its positioning around the core 2, a shape similar to that of the board . It can be seen in FIG. 1 that the board has at its front ends 6 and rear 7 an upward curved portion on which the skateboarder can rest with the feet in order to perform figures or acrobatics.
Les peaux 3,4 sont constituées d'une feuille de fibres croisées et disposées dans le sens horizontal, la feuille de fibres croisées étant imprégnée d'une résine thermodurcissable.The skins 3,4 consist of a sheet of crossed fibers and arranged in the horizontal direction, the cross-fiber sheet being impregnated with a thermosetting resin.
De manière préférentielle, les fibres utilisées pour la constitution de la feuille de fibres croisées sont des fibres de verre. On pourra toutefois utiliser d'autres types de fibres, telles que des fibres de carbone et des fibres d'aramide. En outre, la résine thermodurcissable utilisée pour la constitution de la peau est choisie parmi les résines époxy, les résines polyester, les résines vinylester et les résines polyuréthane.Preferably, the fibers used for forming the cross-fiber sheet are glass fibers. However, other types of fibers, such as carbon fibers and aramid fibers, may be used. In addition, the thermosetting resin used for the constitution of the skin is chosen from epoxy resins, polyester resins, vinylester resins and polyurethane resins.
Tel qu'illustré sur la figure 2, le cordon 5 se compose d'une gaine 8 et de fibres longitudinales 9. Cette gaine 8 est flexible et réalisée en fibres tissées. Cette gaine permet de maintenir et de faciliter la manipulation des fibres longitudinales 9 qu'elle contient. En outre, l'utilisation de fibres tissées pour la constitution de cette gaine 8 permet à la résine de s'imprégner facilement dans le cordon. En outre, les fibres longitudinales 9 renforcent la rigidité de la planche 1 et améliorent la nervosité de celle-ci. Ces fibres longitudinales 9 disposées à l'intérieur de la gaine 8, sont donc également imprégnées par la résine.As illustrated in Figure 2, the bead 5 consists of a sheath 8 and longitudinal fibers 9. This sheath 8 is flexible and made of woven fibers. This sheath makes it possible to maintain and facilitate the handling of the longitudinal fibers 9 that it contains. In addition, the use of woven fibers for the constitution of this sheath 8 allows the resin to easily impregnate into the bead. In addition, the longitudinal fibers 9 strengthen the rigidity of the board 1 and improve the nervousness thereof. These longitudinal fibers 9 disposed inside the sheath 8, are therefore also impregnated with the resin.
De manière préférentielle, les fibres longitudinales 9 utilisées pour la conception du cordon 5 sont des fibres choisies parmi les fibres de verre, les fibres de carbone, les fibres d'aramide, voire des fibres végétales telles que du lin.Preferably, the longitudinal fibers 9 used for the design of the bead 5 are fibers selected from glass fibers, carbon fibers, aramid fibers or even vegetable fibers such as linen.
L'âme 2 de la planche 1 est constituée d'une feuille souple à base de mousse dont des variantes sont illustrées aux figures 3 à 5. Cette feuille de mousse comprend des canaux 10 illustrés sur ces figures 3 à 5. Les canaux 10 sont débouchant et disposés dans le sens de l'épaisseur de la feuille, lesquels permettent à la résine de s'infiltrer ponctuellement au travers de l'épaisseur de la feuille d'âme, ce qui assure une liaison entre la peau supérieure 3 et la peau inférieure 4.The core 2 of the board 1 consists of a flexible foamed sheet whose variants are illustrated in FIGS. 3 to 5. This sheet of foam comprises channels 10 illustrated in FIGS. 3 to 5. The channels 10 are opening and arranged in the direction of the thickness of the sheet, which allow the resin to infiltrate punctually through the thickness of the core sheet, which ensures a connection between the upper skin 3 and the skin lower 4.
Sur les figures 3 et 4, les canaux présentent la forme d'un petit orifice ou trou traversant l'épaisseur de la feuille. On peut toutefois prévoir des variantes de conception de ces canaux, notamment sous la forme de légères fentes disposées dans le sens longitudinal de la feuille et la traversant suivant son épaisseur.In Figures 3 and 4, the channels have the shape of a small hole or hole through the thickness of the sheet. However, it is possible to provide design variants for these channels, in particular in the form of slight slots arranged in the longitudinal direction of the sheet and passing through its thickness.
Selon une variante de conception illustrée à la figure 4, la feuille dispose de rainures 11 disposées en surface, et formant de préférence un quadrillage sur ladite surface. Ces rainures 11 constituent des canaux permettant à la résine de se répandre en surface au travers desdits canaux et d'imprégner toute la surface des feuilles de fibres croisées. Sur la figure 4, de telles rainures 11 sont représentées sur la face supérieure 12 ; on peut toutefois prévoir des rainures similaires sur la face inférieure 13, voire de préférence sur les deux faces 12,13 simultanément. Selon une variante de conception illustrée sur la figure 5, l'âme 2 de la planche est constituée d'une feuille à base de mousse 14 et de fibres 15, ces fibres 15 étant aiguilletées ou piquetées au travers de la mousse 14 de manière à ce qu'elles soient disposées sensiblement dans le sens de l'épaisseur de la feuille. En outre, l'aiguilletage ou le piquetage permet de réaliser des canaux 10 similaires à ceux illustrés en figures 3 et 4, à l'intérieur desquels sont disposées les fibres 15 aiguilletées ou piquetées. Ces fibres 15 seront de préférence des fibres de verre ; on pourra toutefois prévoir tout autre type de fibres tels que des fibres carbone ou des fibres d'aramide. Un tel aiguilletage permet de disposer d'une feuille d'âme dont les extrémités 16 des fibres 17 dépassent de la mousse 14, ce qui garantit l'accrochage de ces fibres 17 avec les fibres croisées des peaux 3,4 disposées horizontalement au dessus et en dessous.According to a design variant illustrated in FIG. 4, the sheet has grooves 11 arranged on the surface, and preferably forming a grid on said surface. These grooves 11 constitute channels allowing the resin to spread on the surface through said channels and to impregnate the entire surface of the crossed fiber sheets. In Figure 4, such grooves 11 are shown on the upper face 12; however, it is possible to provide similar grooves on the lower face 13, or preferably on both faces 12, 13 simultaneously. According to a variant of the design illustrated in FIG. 5, the core 2 of the board consists of a sheet made of foam 14 and fibers 15, these fibers 15 being needled or staked through the foam 14 so as to they are arranged substantially in the direction of the thickness of the sheet. In addition, the needling or picketing allows for channels 10 similar to those illustrated in FIGS. 3 and 4, within which the needled or stitched fibers are arranged. These fibers will preferably be glass fibers; however, any other type of fiber such as carbon fibers or aramid fibers may be provided. Such needling makes it possible to have a web sheet whose ends 16 of the fibers 17 protrude from the foam 14, which guarantees the attachment of these fibers 17 with the cross-fibers of the skins 3,4 arranged horizontally above and below.
De manière préférentielle et non limitative, cette mousse choisie pour la feuille d'âme 2 est une mousse du type polyéthylène, polyuréthane, PVC ou PET.In a preferential and nonlimiting manner, this foam chosen for the core sheet 2 is a foam of the polyethylene, polyurethane, PVC or PET type.
La feuille à base de mousse, munie éventuellement de fibres aiguilletées, et les feuilles de fibres croisées sont à l'état initial souples. Celles-ci sont donc découpées au moyen d'un patron afin de constituer la forme longitudinale avec les extrémités arrondies de la planche 1. Les dimensions des feuilles de fibres croisées pour la constitution des peaux 3,4 sont découpées à des dimensions légèrement supérieures à celles de la feuille à base de mousse constituant l'âme 2.The foam-based sheet, optionally provided with needled fibers, and the cross-fiber sheets are soft in their initial state. These are therefore cut by means of a pattern so as to form the longitudinal shape with the rounded ends of the board 1. The dimensions of the crossed fiber sheets for the constitution of the skins 3,4 are cut to slightly larger dimensions than those of the foam-based sheet constituting the core 2.
Ainsi, lors de la fabrication de la planche 1, le cordon 5, disposé sur le pourtour externe 18 de l'âme 2, c'est à dire de la feuille de mousse, est recouvert partiellement sur son côté supérieur 19 et sur son côté inférieur 20 par les feuilles de fibres croisées constituant respectivement les peaux supérieure 3 et inférieure 4.Thus, during the manufacture of the board 1, the cord 5, disposed on the outer periphery 18 of the core 2, that is to say of the foam sheet, is partially covered on its upper side 19 and on its side lower 20 by the crossed fiber sheets constituting the upper and lower skins respectively 4.
Pour la fabrication de la planche 1, on utilise un moule comprenant une matrice inférieure et une matrice supérieure comprenant une empreinte présentant la forme de celle de la planche 1, telle qu'illustrée sur la figure 1, de préférence.For the manufacture of the board 1, using a mold comprising a lower die and an upper die comprising an imprint having the shape of that of the board 1, as shown in Figure 1, preferably.
Ainsi, on dispose la première feuille de fibres croisées souple à l'intérieur de l'empreinte de la matrice inférieure, ladite feuille épousant la forme de ladite empreinte. Puis, on dispose la feuille à base de mousse, également souple, au dessus de ladite feuille de fibres de verre croisées. Il convient alors de disposer le cordon 5 autour de la feuille de mousse, ledit cordon 5 épousant le bord périphérique de ladite feuille de mousse et débordant par rapport au contour périphérique 21 de la feuille de fibres croisées. Les empreintes de matrices supérieure et inférieure du moule pourront prévoir des moyens de positionnement et/ou maintien dudit cordon 5, ce qui facilitera son positionnement. Une fois le cordon 5 positionné, on dispose la seconde feuille de fibres croisées au dessus de la feuille à base de mousse et au dessus du cordon qui déborde par rapport au contour périphérique 22 de ladite seconde feuille. II convient ensuite de fermer ce moule en positionnant la matrice supérieure au dessus de la matrice inférieure puis d'injecter la résine thermodurcissable, celle-ci s'imprégnant dans les feuilles de fibres croisées de manière homogène sur la peau inférieure et sur la peau supérieure. Par ailleurs, cette résine s'infiltre au travers des canaux 10 dans la feuille de mousse voire éventuellement se propage au travers des rainures 11 sur la dite feuille. Cette résine s'imprègne également dans le cordon 5 en passant au travers des interstices des fibres tissées constituant la gaine 8, pour imprégner ensuite les fibres longitudinales 9.Thus, the first flexible cross-fiber sheet is placed inside the imprint of the lower die, said sheet conforming to the shape of said imprint. Then, the foamed sheet, also flexible, is placed above said cross-fiberglass sheet. It is then necessary to arrange the cord 5 around the foam sheet, said cord 5 conforming to the peripheral edge of said foam sheet and projecting with respect to the peripheral contour 21 of the cross-fiber sheet. The upper and lower die imprints of the mold may provide means for positioning and / or maintaining said bead 5, which will facilitate its positioning. Once the cord 5 is positioned, the second cross-fiber sheet is placed on top of the foam-based sheet and over the bead protruding from the peripheral contour 22 of said second sheet. It is then necessary to close this mold by positioning the upper die above the lower die and then inject the thermosetting resin, the latter impregnated into the cross-fiber sheets homogeneously on the lower skin and on the upper skin . Moreover, this resin infiltrates through the channels 10 in the foam sheet or possibly propagates through the grooves 11 on said sheet. This resin is also impregnated in the bead 5 passing through the interstices of the woven fibers constituting the sheath 8, to then impregnate the longitudinal fibers 9.
Le cordon 5 dispose à l'état normal, c'est-à-dire avant constitution de la planche 1, d'une forme circulaire. En outre, sa conception telle que décrite précédemment lui confère une souplesse et une flexibilité permettant de le disposer convenablement autour de l'âme. En outre, sa souplesse permet de l'écraser lors de la fermeture du moule.The cord 5 has in the normal state, that is to say before constitution of the board 1, a circular shape. In addition, its design as described above gives it flexibility and flexibility to to arrange properly around the soul. In addition, its flexibility allows crushing when closing the mold.
De manière préférentielle, le diamètre du cordon est déterminé afin d'obtenir après son écrasement, une fois disposé à l'intérieur du moule, une largeur comprise entre 10 et 50 mm, tandis que son épaisseur sera légèrement supérieure à celle de l'âme 2, du fait de cet écrasement. De manière préférentielle, le cordon 5 à l'état normal présente un diamètre de 5 à 40 mm permettant d'obtenir après écrasement une largeur de cordon de l'ordre de 10 à 50 mm. En outre, on utilise de préférence, une âme 2 comprenant une épaisseur comprise entre 5 mm et 10 mm, l'épaisseur des deux peaux 3,4 étant complémentaire de manière à obtenir une épaisseur totale de la planche 1 égale au moins à 10 mm, répondant aux normes de fabrication telles que prévues en France. Afin de faciliter le positionnement du cordon 5, tel que précisé ci-dessus, celui-ci se présente sous la forme d'une corde munie de deux extrémités 23, 24 illustrées en figure 2, la longueur de la corde correspondant à la longueur du pourtour périphérique de l'âme 2.Preferably, the diameter of the bead is determined in order to obtain, after being crushed, once placed inside the mold, a width of between 10 and 50 mm, while its thickness will be slightly greater than that of the core. 2, because of this crash. Preferably, the cord 5 in the normal state has a diameter of 5 to 40 mm to obtain after crushing a bead width of the order of 10 to 50 mm. In addition, a core 2 comprising a thickness of between 5 mm and 10 mm is preferably used, the thickness of the two skins 3,4 being complementary so as to obtain a total thickness of the board 1 equal to at least 10 mm. , meeting the manufacturing standards as planned in France. To facilitate the positioning of the cord 5, as specified above, it is in the form of a rope provided with two ends 23, 24 shown in Figure 2, the length of the rope corresponding to the length of the peripheral perimeter of the soul 2.
Ces extrémités 23,24 sont munies de moyens d'assujettissement permettant de constituer un cordon continu disposé autour de l'âme 2.These ends 23, 24 are provided with securing means making it possible to constitute a continuous bead disposed around the core 2.
De manière préférentielle et non limitative, ces extrémités 23,24 de la corde sont complémentaires, c'est-à-dire qu'elles sont agencées pour coopérer lors de leur réunion une fois positionnées autour de la feuille à base de mousse et de fibres de verre aiguilletées. Pour cela, les extrémités 25, 26 des fibres longitudinales 9 ont de préférence une découpe en mi-bois telle qu'illustrée en figure 5, qui présente pour avantage d'imbriquer les extrémités 25,26 des fibres longitudinales tout en augmentant la surface de contact entre les deux extrémités 25,26. Ainsi, lors de l'injection de la résine, on assure un maintien en position assujettie les deux extrémités 16,17 du cordon 5. On pourra toutefois prévoir d'autres moyens d'assujettissement tels que la réalisation d'une épissure entre les deux extrémités 16,17. De manière préférentielle, la structure de renfort comprend également un renfort central disposé longitudinalement sur la planche, soit sur le côté supérieur et sur le côté inférieur autour de l'âme, soit directement intégré en partie centrale longitudinale de celle-ci ; dans ce cas, l'âme se compose de deux portions de feuille à base de mousse, comprenant éventuellement des fibres aiguilletées. Ce renfort central longitudinal s'étend de part et d'autre des extrémités avant et arrière de la planche.In a preferred and nonlimiting manner, these ends 23,24 of the rope are complementary, that is to say that they are arranged to cooperate during their meeting once positioned around the sheet made of foam and fibers needled glass. For this purpose, the ends 25, 26 of the longitudinal fibers 9 preferably have a half-wood cut as illustrated in FIG. 5, which has the advantage of interleaving the ends 25, 26 of the longitudinal fibers while increasing the surface area. contact between the two ends 25,26. Thus, when the resin is injected, the two ends 16, 17 of the bead 5 are secured in the secured position. Other securing means may, however, be provided such as the creation of a splice between the two. ends 16,17. Preferably, the reinforcing structure also comprises a central reinforcement disposed longitudinally on the board, either on the upper side and on the lower side around the core, or directly integrated in the longitudinal central portion thereof; in this case, the core consists of two portions of foamed sheet, optionally comprising needled fibers. This longitudinal central reinforcement extends on both sides of the front and rear ends of the board.
Selon une variante de conception, on pourra prévoir également une bande de drapage ou un morceau de gaine disposé transversalement sur la planche, cette bande de drapage enveloppant l'âme 2, le cordon 5 et les deux feuilles de fibres croisées constituant les deux peaux 3,4, cette bande étant également imprégnée de résine. Une telle bande a pour fonction d'améliorer la rigidité de la planche dans des zones déterminées, notamment les zones de la planche qui sont soumises à des déformations importantes lors de la réalisation des sauts, c'est-à-dire les zones en particulier situées à proximité des portions recourbées.According to a variant of the design, it is also possible to provide a draping strip or a piece of sheath arranged transversely on the board, this draping strip enveloping the core 2, the cord 5 and the two cross-fiber sheets constituting the two skins 3 , 4, this band being also impregnated with resin. Such a band has the function of improving the rigidity of the board in specific areas, especially areas of the board which are subject to significant deformations during the realization of jumps, that is to say the areas in particular located near the curved portions.
De manière préférentielle, ces bandes de drapage ou morceaux de gaine sont réalisés en fibres tissées, identiques à ceux utilisés pour la constitution de la gaine du cordon. On peut toutefois prévoir des fibres de composition différente pour ces bandes de drapage ou morceaux de gaine.Preferably, these drapery strips or pieces of sheath are made of woven fibers, identical to those used for forming the sheath of the cord. However, it is possible to provide fibers of different composition for these draping strips or pieces of sheath.
D'autres caractéristiques peuvent être envisagées sans sortir du cadre de la présente invention. Other characteristics may be envisaged without departing from the scope of the present invention.

Claims

REVENDICATIONS
1. Planche à roulettes, comprenant une planche (1) de forme longitudinale, et un système à roulettes fixé sur la face inférieure de la planche, cette planche (1) étant constituée d'une structure dite en sandwich composée d'une âme (2) et de deux peaux (3,4), l'une (3) des peaux, dite supérieure, étant disposée au-dessus de l'âme (2), et l'autre (4) des peaux, dite inférieure, étant disposée en dessous de l'âme (2), et d'une structure de renfort disposée au moins sur le pourtour de l'âme (1), l'âme (2) étant constituée au moins d'une feuille à base de mousse (10) et les peaux (3,4) étant constituées chacune d'une feuille de fibres croisées, les dites feuilles de fibres croisées étant imprégnées d'une résine thermodurcissable, CARACTERISEE en ce que la structure de renfort consiste en un cordon (5) constitué d'une gaine (8) flexible en fibres tissées, et de fibres longitudinales (9) disposées à l'intérieur de cette gaine (8), ledit cordon (5) étant imprégné par la résine thermodurcissable des peaux supérieure (3) et inférieure (4).1. Skateboard, comprising a board (1) of longitudinal shape, and a roller system fixed on the underside of the board, this board (1) consisting of a so-called sandwich structure composed of a core ( 2) and two skins (3, 4), one (3) of the skins, said upper, being disposed above the core (2), and the other (4) of the skins, said lower, being disposed below the core (2), and a reinforcing structure disposed at least around the periphery of the core (1), the core (2) consisting of at least one sheet of foam (10) and the skins (3, 4) being each constituted by a cross-fiber sheet, said cross-fiber sheets being impregnated with a thermosetting resin, CHARACTERIZED in that the reinforcing structure consists of a cord ( 5) consisting of a sheath (8) flexible woven fibers, and longitudinal fibers (9) disposed within this sheath (8), said bead (5) being im impregnated with the thermosetting resin of the upper (3) and lower (4) skins.
2. Planche à roulettes selon la revendication 1, dans laquelle la feuille de mousse constituant l'âme (2) comprend des petits canaux (10) traversant ladite feuille sur son épaisseur, ces canaux étant agencés pour permettre le passage de la résine de manière à créer une liaison entre la peau supérieure (3) et la peau inférieure (4) en passant au travers de l'âme (2). 2. A skateboard according to claim 1, wherein the foam sheet constituting the core (2) comprises small channels (10) passing through said sheet on its thickness, these channels being arranged to allow the passage of the resin in a manner creating a bond between the upper skin (3) and the lower skin (4) while passing through the core (2).
3. Planche à roulettes selon la revendication 1 ou 2, dans laquelle la feuille de mousse constituant l'âme (2) comprend des petites rainures en surface sur au moins une de ses faces supérieure (12) ou inférieure (13), ces rainures (11) étant agencées pour répartir uniformément la résine sur toute la surface de la peau (3,4). 3. Skateboard according to claim 1 or 2, wherein the foam sheet constituting the core (2) comprises small grooves surface on at least one of its upper faces (12) or lower (13), these grooves (11) being arranged to uniformly distribute the resin over the entire surface of the skin (3,4).
4. Planche à roulettes selon l'une des revendications 1 à 3, dans laquelle la feuille de mousse constituant l'âme (2) comprend des fibres (15) aiguilletées ou piquetées.4. Skateboard according to one of claims 1 to 3, wherein the foam sheet constituting the core (2) comprises fibers (15) needled or stitched.
5. Planche à roulettes selon l'une des revendications 1 à 4, dans laquelle le contour périphérique (22) de la feuille de fibres croisées de la peau supérieure (3) et celui (21) de la peau inférieure (4) recouvrent partiellement respectivement le côté supérieur (19) et le côté inférieur (20) du cordon (5).5. Skateboard according to one of claims 1 to 4, wherein the peripheral contour (22) of the cross-fiber sheet of the upper skin (3) and that (21) of the lower skin (4) overlap partially respectively the upper side (19) and the lower side (20) of the bead (5).
6. Planche à roulettes, selon l'une des revendications 1 à 5, dans laquelle le cordon (5), positionné sur la planche (1), comprend une largeur comprise entre 10 mm et 50 mm.6. Skateboard according to one of claims 1 to 5, wherein the bead (5), positioned on the board (1), comprises a width of between 10 mm and 50 mm.
7. Planche à roulettes selon l'une des revendications 1 à 6, dans laquelle le cordon (5) comprend une forme de corde munie de deux extrémités (23,24), lesdites extrémités (23,24) comprenant des moyens d'assujettissement agencés pour joindre lesdites extrémités (23,24) lorsque le cordon est disposé autour de l'âme (2).7. Skateboard according to one of claims 1 to 6, wherein the cord (5) comprises a rope shape provided with two ends (23,24), said ends (23,24) comprising means of subjection arranged to join said ends (23,24) when the bead is disposed around the core (2).
8. Planche à roulettes selon la revendication 7, dans laquelle les moyens d'assujettissement sont constitués par la forme complémentaire des extrémités (23,24) du cordon (5), les extrémités (25,26) des fibres longitudinales (9) présentant une découpe en mi-bois.8. Skateboard according to claim 7, wherein the securing means are constituted by the complementary shape of the ends (23,24) of the bead (5), the ends (25,26) of the longitudinal fibers (9) having a cut in mid-wood.
9. Planche à roulettes selon l'une des revendications 1 à 8, laquelle comprend un renfort central longitudinal s'étendant jusqu'aux extrémités arrière et avant de la planche (1).9. Skateboard according to one of claims 1 to 8, which comprises a longitudinal central reinforcement extending to the rear and front ends of the board (1).
10. Planche à roulettes selon l'une des revendications 1 à 9, laquelle comprend au moins une bande de drapage ou une gaine, enveloppant transversalement au moins une portion des feuilles de fibres croisées des deux peaux (3,4), une portion du cordon (5) et une portion de l'âme (2), cette bande étant également imprégnée de résine. 10. Skateboard according to one of claims 1 to 9, which comprises at least one draping strip or sheath, transversely enveloping at least a portion of the cross-fiber sheets of the two skins (3,4), a portion of cord (5) and a portion of the core (2), this band being also impregnated with resin.
PCT/FR2009/051028 2008-06-03 2009-06-01 Skateboard and method of manufacturing the board WO2009156672A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0853637A FR2931691B1 (en) 2008-06-03 2008-06-03 ROLLER BOARD AND METHOD OF MANUFACTURING THE BOARD
FR0853637 2008-06-03

Publications (2)

Publication Number Publication Date
WO2009156672A2 true WO2009156672A2 (en) 2009-12-30
WO2009156672A3 WO2009156672A3 (en) 2010-03-18

Family

ID=40185062

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2009/051028 WO2009156672A2 (en) 2008-06-03 2009-06-01 Skateboard and method of manufacturing the board

Country Status (2)

Country Link
FR (1) FR2931691B1 (en)
WO (1) WO2009156672A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012104335U1 (en) * 2012-11-12 2014-02-17 Rehau Ag + Co. Board, especially skateboard or snowboard
CN108970095A (en) * 2018-08-22 2018-12-11 惠州市杰诚运动器材有限公司 High-strength abrasion-proof slide plate
CN110180160A (en) * 2019-07-06 2019-08-30 惠州市富铭运动器材有限公司 A kind of novel skateboarding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109126104A (en) * 2018-08-26 2019-01-04 沈明慧 A kind of slide plate reducing windage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182520A (en) * 1978-07-24 1980-01-08 Stevenson Richard L Skateboard structure
US20030222420A1 (en) * 2002-06-01 2003-12-04 Hadzicki David Herbert Composit sport board
US20060049596A1 (en) * 2004-09-09 2006-03-09 Peter Hill Skateboard deck construction
US7048284B1 (en) * 2004-07-14 2006-05-23 Illuminated Sports Illuminated skateboard

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182520A (en) * 1978-07-24 1980-01-08 Stevenson Richard L Skateboard structure
US20030222420A1 (en) * 2002-06-01 2003-12-04 Hadzicki David Herbert Composit sport board
US7048284B1 (en) * 2004-07-14 2006-05-23 Illuminated Sports Illuminated skateboard
US20060049596A1 (en) * 2004-09-09 2006-03-09 Peter Hill Skateboard deck construction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012104335U1 (en) * 2012-11-12 2014-02-17 Rehau Ag + Co. Board, especially skateboard or snowboard
CN108970095A (en) * 2018-08-22 2018-12-11 惠州市杰诚运动器材有限公司 High-strength abrasion-proof slide plate
CN108970095B (en) * 2018-08-22 2024-04-30 惠州市杰诚运动器材有限公司 High-strength wear-resistant skateboard
CN110180160A (en) * 2019-07-06 2019-08-30 惠州市富铭运动器材有限公司 A kind of novel skateboarding

Also Published As

Publication number Publication date
FR2931691A1 (en) 2009-12-04
FR2931691B1 (en) 2010-06-25
WO2009156672A3 (en) 2010-03-18

Similar Documents

Publication Publication Date Title
EP2000180B1 (en) Snowboard or skateboard with reinforcement made of natural fibers
EP2082788B1 (en) Alpine ski with adjustment means
EP1405657A1 (en) Gliding or roller board
EP1249184A1 (en) Reinforcement for sportshoe
WO2009156672A2 (en) Skateboard and method of manufacturing the board
FR2800622A1 (en) Sliding or rolling board used as a snowboard, skiboard or rollboard has an upper surface with recesses
EP3305378B1 (en) Racquet, in particular structure of padel racquet
FR2565837A1 (en) WOODEN CORE SKI AND FOAM COMPRISING STRAINING SPACERS
EP1685772A1 (en) Composite sole for bicycle shoe provided with integrated anchor insert and bicycle shoe equipped with such sole
FR2939688A1 (en) SKI OR SNOWBOARD COMPRISING A PLATE TYPE FORCE TRANSMISSION ELEMENT
FR2672810A1 (en) ALPINE SKI INTENDED TO SLIP ON SNOW AND ICE.
EP0976427B1 (en) Sliding board for alpine skiing or snow surfing
EP3225288B1 (en) Racquet, in particular padel racquet structure
FR2725910A3 (en) Snow board with hollow sections under shell
FR2850292A1 (en) SLIDING OR RUNNING BOARD
EP3106212B1 (en) Snowboard
FR2906478A1 (en) Roller or gliding snowboard for practicing e.g. surfing on snow or water, has reinforcements extending parallel to upper side of snowboard, and end fittings bordering portions of snowboard circumference and arranged above reinforcements
EP3251730B1 (en) Ski with lightweight core
EP0677306B1 (en) Ski and method for producing the same
FR3046732B1 (en) SNOWBOARD BOARD ON SNOW
FR2720287A3 (en) Snow:board
US8448961B2 (en) Apparatus, system, and method for open frames for sport decks
EP2398643A1 (en) Board for practicing acrobatic jumps on a trampoline
FR3056919A1 (en) RACKET, ESPECIALLY PADEL RACKET STRUCTURE
FR2999944A1 (en) LATERAL SINGING FOR SLIDING BOARD

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09769513

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09769513

Country of ref document: EP

Kind code of ref document: A2