EP0677306A1 - Ski und Verfahren zu dessen Herstellung - Google Patents

Ski und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0677306A1
EP0677306A1 EP95420080A EP95420080A EP0677306A1 EP 0677306 A1 EP0677306 A1 EP 0677306A1 EP 95420080 A EP95420080 A EP 95420080A EP 95420080 A EP95420080 A EP 95420080A EP 0677306 A1 EP0677306 A1 EP 0677306A1
Authority
EP
European Patent Office
Prior art keywords
ski
visco
sub
interface
elastic material
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.)
Granted
Application number
EP95420080A
Other languages
English (en)
French (fr)
Other versions
EP0677306B1 (de
Inventor
Yves Piegay
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 EP0677306A1 publication Critical patent/EP0677306A1/de
Application granted granted Critical
Publication of EP0677306B1 publication Critical patent/EP0677306B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof

Definitions

  • the invention relates to a new type of ski, in particular alpine skiing, or even also cross-country skiing, advantageously but not limitatively provided with a non-planar upper profile. It also relates to methods of manufacturing this type of ski.
  • the profile of the skis originally very traditional, since it has a substantially rectangular or even trapezoidal cross section, has substantially evolved to result in skis of variable shapes, which may in particular include a non-planar top, giving for example a triangular cross section.
  • the limit thickness of the ski capable of giving it properties of sufficient resistance to the maximum stresses of traction and compression during bending stresses , is around 26 mm.
  • the neutral fiber is located substantially at 40% of the thickness of the ski starting from the sole.
  • the invention proposes to produce a thick ski in composite material, capable of overcoming these phenomena of ruptures and delamination.
  • This ski the thickness of which at the pad level is greater than 26 mm, is produced in two main parts, that is to say comprising two sub-assemblies, respectively a lower main sub-assembly, and an upper secondary sub-assembly. , extending substantially over the entire carrying length of the ski, the subassemblies being secured to one another by means of a sheet or plate made of a visco-elastic material.
  • an alpine ski comprising on the one hand, the ski itself and on the other hand, a stiffener, shorter than the contact surface of the ski with snow, and attached to part of the upper face of the ski, the ski itself and the stiffener further comprising at their interface a layer of flexible elastic or visco-elastic material in order to provide damping functions.
  • the stiffener used has the function of limiting bending and aims to oppose the excessive opening of the ski. It therefore fulfills here only a function of adjustment in bending, partially modified by the damping action of the plate of visco-elastic material.
  • the ski according to the invention consists, over its carrying length, of two superposed sub-assemblies, secured to one another by means of an interface constituted by a sheet or a plate made of a visco-elastic material , glued over its entire length to each of these two sub-assemblies. It is characterized in that the sheet or plate of visco-elastic material is located approximately at the level of the median plane of the thickness of the ski.
  • said median plane incorporates the neutral fiber of the ski.
  • said plate or sheet of visco-elastic material is located at the level of the neutral fiber, said neutral fiber being traditionally defined as being the zone at which the compressive and tensile stresses are canceled.
  • the interface between the two sub-assemblies is not planar, but can adopt any profile, and for example in inverted V.
  • the two sub-assemblies respectively lower and upper, both comprise a core made of polyurethane, or one made of polyurethane and the other of wood, or even of other substitute materials, each core comprising at least one element.
  • reinforcement consisting of either a fabric or a sheet of glass fibers, carbon or aramids (KEVLAR - Registered trademark), or by a metal strip pre-impregnated with a thermosetting resin, in particular to promote its bonding.
  • Each of the sub-assemblies advantageously consists of a core surrounded by a sheath of woven material, advantageously pre-impregnated with a thermosetting resin, such as an epoxy resin.
  • the strip of visco-elastic material is flush laterally at the edges of the ski.
  • the two sub-assemblies as well as the intermediate element constituted by the plate of visco-elastic material are included in a shaped shell, supporting the decoration.
  • the invention also relates to a method for producing such a ski.
  • This process is characterized in that the constituent sub-assemblies of the ski are directly produced according to the desired profile, then placed in a mold, with the interposition of an interface made of visco-elastic material pre-bonded with a resin, the cohesion of the final constitutive structure of the ski being obtained by raising the temperature of the mold, liquefying said prepreg resin and revealing its qualities of adhesion.
  • the cores are produced either by machining or by injection of polyurethane in a specific mold. The two cores entering the structure of the same ski can be of identical or different natures.
  • the lower sub-assembly previously produced according to the final shape is put into place within a mold in shape on the sole and square elements, then we proceed when the sheet or sheet of visco-elastic material is put in place, then these elements are capped by a shell comprising, at its upper internal face, reinforcing elements, and finally, polyurethane is injected in order to to form the upper core inside the space provided between the shell and the sheet of visco-elastic material.
  • the sheet of visco-elastic material is covered with a reinforcing strip prior to the injection of polyurethane.
  • Figure 1 is a schematic perspective representation of a variable profile ski implementing the invention.
  • Figures 2 and 3 are schematic representations in cross section of a ski with a traditional profile, according to two different embodiments, according to the invention.
  • FIGs 4 and 5 are schematic representations of cross section of the ski shown in Figure 1, also according to two different embodiments.
  • Figure 6 is a schematic representation in cross section of a ski, according to the profile of Figure 1, during molding, produced according to another embodiment of the invention.
  • FIG. 7 is a schematic representation in cross section of a ski, during molding, produced according to another embodiment of the invention.
  • the ski shown in FIG. 1 firstly comprises a gliding sole (1), extending between its two ends, respectively posterior (2) (heel) and anterior (3) (tip).
  • This ski may be with a full hull, that is to say, covering the ski from one edge to another, as also shown in FIGS. 2 and 4, or with partial hull (FIG. 3 and 5), or on the contrary more traditional and, in this case includes side edges.
  • the ski shown in Figure 1 has a particular profile, also described in French application No. 93.06807 of the Applicant, since its upper face (4), which in this case must be understood as being the surface s' extending from the upper end of a side edge to the other when these exist, or directly from one metal edge to another when it is a hull ski, is in relief and present at the at least one upper edge (5), in fact defining two slopes respectively (6) and (8), inclined relative to the plane of the surface of the sole.
  • any cross section of this type of ski is of substantially triangular shape, as can be seen in FIGS. 4, 5, 6 and 7.
  • the thickness of this ski in particular at the level of the skate (9), that is to say the thickest central zone of the ski at the level of which the bindings are implanted, is greater than 26 mm, and for example 28 mm at its thickest point.
  • the internal structure of the ski basically comprises two sub-assemblies each comprising a core, respectively (11) and (12), extending over the entire bearing length of the ski, secured between them, in particular by bonding, at their common interface, said interface further receiving a sheet or plate (16) of a visco-elastic material.
  • the carrying length of a ski is defined as being the distance on the sole separating the two front (23) and rear (24) contact lines of the ski.
  • the two sub-assemblies integrating the cores (11) and (12) are thus likely, by the existence of this sheet or plate of visco-elastic material (16), to move very slightly, one relative to the 'other, in other words to allow shearing movement of the upper part of the ski relative to the lower part, without causing rupture or delamination phenomena, which skis known hitherto did not allow to obtain, taking into account the rigidity of the stacks, therefore the relative elastic non-shearing, that is to say non-destructive.
  • the two cores (11) and (12) are made of polyurethane, each of said cores being surrounded by a fabric sheath respectively (14) and (15), playing the role of reinforcing element, and constituting with said cores (11, 12) the lower and upper sub-assemblies.
  • the polyurethane cores can advantageously be produced before the actual production of the ski, either by machining or by injection into a specific mold.
  • the ski itself is finalized at the level of a mold, in which the sole (1), first made of polyethylene and two lateral metal edges, are first put in place. (10).
  • the first core (11) provided with its fabric sheath (14) pre-impregnated with a thermosetting epoxy resin is then placed on the sole (1) between two vertical edges (7).
  • the visco-elastic material interface (16) is then placed flat on the upper face of the core (11) and the edges (7).
  • the upper core (12) also provided with a fabric sheath (15) pre-impregnated with a thermosetting resin, in particular an epoxy resin, on said interface (16).
  • the assembly is then covered for example with a shaped shell (13), supporting the decor.
  • the mold is then closed and brought to temperature so as to lead to a quasi-liquefaction of the prepreg resins, making it possible to develop their bonding properties, and thus ensuring the cohesion of the whole.
  • the ski is a ski with a typically trapezoidal cross section.
  • this ski may have a rectangular profile as described in FIG. 3, or else, with a variable profile as shown in FIGS. 1, 4, 5, 6 and 7, and so have a triangular section, the characteristics of which dimensions of each of the faces are likely to vary throughout the ski.
  • the visco-elastic material is not necessarily flat and parallel to the sole (1), as shown in Figures 2, 3 and 4, but can adopt a particular profile more suited to of the ski profile as shown in FIG. 5.
  • the interface (16) of visco-elastic material adopts a shape such that it allows its positioning to come as close as possible to the median plane of the thickness of the ski, and advantageously neutral fiber of the ski, in order to optimize the shear conditions of the ski even when the ski is heavily stressed so as to, on the one hand, reduce the risks of delamination, and on the other hand, increase the reactivity characteristics of the ski.
  • the properties, in particular mechanical properties of the interface film (16) made of visco-elastic material are liable to vary as a function of its positioning over the length of the ski, in order to facilitate the shearing phenomenon in areas of greatest stress.
  • FIG. 7 In another embodiment of the invention, more specifically shown in Figure 7, is positioned on the sole (1) and the edges (10) inside a mold (20, 21), the sub- lower assembly (11,14) analogously to the example described above, and on which the interface (16) is positioned flat in visco-elastic, a layer of a reinforcing element is placed on its upper face ( 18). A sheet is then put in place after completion of the ski to form a shell (13), said sheet being provided at its upper internal face with a layer of a reinforcing element (22). The mold (20, 21) is closed and finally the polyurethane is injected into the free space provided between the interface (16) and the sheet (13), so as to produce the core upper (12).
  • the edges of the reinforcing element (22) are not in contact with the reinforcing element (18) and a fortiori the interface (16), so as to create at this level a discontinuity of the reinforcements, to facilitate the shearing phenomena of the upper sub-assembly relative to the lower sub-assembly on either side of the interface (16,18).
  • the external shell (13) includes the two lower and upper sub-assemblies, without showing any break, that is to say discontinuity at the interface (16) (see FIGS. 2, 4, 6, 7), the shear occurring at said viscoelastic interface (16) is taken up by the plasticity of the material constituting the shell: polyethylene, ABS, etc..

Landscapes

  • Laminated Bodies (AREA)
  • Catalysts (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Reinforced Plastic Materials (AREA)
EP95420080A 1994-04-15 1995-03-28 Ski und Verfahren zu dessen Herstellung Expired - Lifetime EP0677306B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9404823A FR2718648B1 (fr) 1994-04-15 1994-04-15 Ski et son procédé de fabrication.
FR9404823 1994-04-15

Publications (2)

Publication Number Publication Date
EP0677306A1 true EP0677306A1 (de) 1995-10-18
EP0677306B1 EP0677306B1 (de) 1998-12-16

Family

ID=9462381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95420080A Expired - Lifetime EP0677306B1 (de) 1994-04-15 1995-03-28 Ski und Verfahren zu dessen Herstellung

Country Status (4)

Country Link
EP (1) EP0677306B1 (de)
AT (1) ATE174522T1 (de)
DE (1) DE69506609T2 (de)
FR (1) FR2718648B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2747579A1 (fr) * 1996-04-22 1997-10-24 Rossignol Sa Procede de realisation d'une planche de glisse et planche de glisse obtenue par ce procede
FR2804336A1 (fr) * 2000-02-02 2001-08-03 Rossignol Sa Ski alpin
EP1175925A1 (de) * 2000-07-28 2002-01-30 Salomon S.A. Gleitbrett

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0428887A1 (de) * 1989-11-22 1991-05-29 Salomon S.A. Verfahren zur Herstellung eines geleimten Skis Verfahren zur Herstellung eines geleimten Skis
EP0428885A1 (de) * 1989-11-22 1991-05-29 Salomon S.A. Verfahren zur Herstellung eines Skis durch Injektion, und Skistruktur
DE4130110A1 (de) * 1990-09-27 1992-04-02 Rohrmoser Alois Skifabrik Ski mit einer raeumlich profilierten oberseite
EP0490044A1 (de) * 1990-12-14 1992-06-17 Salomon S.A. Wintersportski bestehend aus einer Versteifung und einer Basis

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0428887A1 (de) * 1989-11-22 1991-05-29 Salomon S.A. Verfahren zur Herstellung eines geleimten Skis Verfahren zur Herstellung eines geleimten Skis
EP0428885A1 (de) * 1989-11-22 1991-05-29 Salomon S.A. Verfahren zur Herstellung eines Skis durch Injektion, und Skistruktur
DE4130110A1 (de) * 1990-09-27 1992-04-02 Rohrmoser Alois Skifabrik Ski mit einer raeumlich profilierten oberseite
EP0490044A1 (de) * 1990-12-14 1992-06-17 Salomon S.A. Wintersportski bestehend aus einer Versteifung und einer Basis

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2747579A1 (fr) * 1996-04-22 1997-10-24 Rossignol Sa Procede de realisation d'une planche de glisse et planche de glisse obtenue par ce procede
FR2804336A1 (fr) * 2000-02-02 2001-08-03 Rossignol Sa Ski alpin
EP1175925A1 (de) * 2000-07-28 2002-01-30 Salomon S.A. Gleitbrett
FR2812211A1 (fr) * 2000-07-28 2002-02-01 Salomon Sa Planche de glisse
US6631918B2 (en) 2000-07-28 2003-10-14 Salomon S.A. Gliding board, such as a ski, and a gliding board equipped with a boot-retaining assembly

Also Published As

Publication number Publication date
ATE174522T1 (de) 1999-01-15
DE69506609T2 (de) 1999-05-06
DE69506609D1 (de) 1999-01-28
FR2718648B1 (fr) 1996-06-14
EP0677306B1 (de) 1998-12-16
FR2718648A1 (fr) 1995-10-20

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