EP0661086A1 - Ski - Google Patents

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Publication number
EP0661086A1
EP0661086A1 EP94420325A EP94420325A EP0661086A1 EP 0661086 A1 EP0661086 A1 EP 0661086A1 EP 94420325 A EP94420325 A EP 94420325A EP 94420325 A EP94420325 A EP 94420325A EP 0661086 A1 EP0661086 A1 EP 0661086A1
Authority
EP
European Patent Office
Prior art keywords
plane
ski
sole
strip
flat
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
EP94420325A
Other languages
English (en)
French (fr)
Other versions
EP0661086B1 (de
Inventor
Jacques Fagot
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 EP0661086A1 publication Critical patent/EP0661086A1/de
Application granted granted Critical
Publication of EP0661086B1 publication Critical patent/EP0661086B1/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
    • A63C5/04—Structure of the surface thereof
    • A63C5/0405—Shape thereof when projected on a plane, e.g. sidecut, camber, rocker
    • A63C5/0411—Shape thereof when projected on a plane, e.g. sidecut, camber, rocker asymmetric
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/12—Making thereof; Selection of particular materials
    • A63C5/126—Structure of the core

Definitions

  • the invention relates to an improved ski, in particular a ski with an asymmetrical structure.
  • a ski is subject to several types of deformation. It is, during an effort, mainly subjected to a simple normal flexion, which is exerted perpendicular to the sole on a ski placed between two supports, flat on its sole; this deformation allows it to follow the relief of the terrain; the resistance of a ski to this deformation, that is to say its stiffness in bending or its distribution of flexibility, is calculated to distribute the load of the skier on the snow.
  • a ski is also subjected to a simple lateral bending, which is exerted laterally on the side of the ski and causes bending of the median longitudinal axis of the lower assembly; this deformation, which is not controlled, is harmful and impairs the accuracy of the ski. Furthermore, a ski receives twists or twists, in particular at its two tips tip and heel. As before, these deformations are parasitic and affect good use of the ski. Finally, a ski is subjected to compound deformations: bending plus torsion, or normal bending plus lateral bending, etc ....
  • skis have a wide area at the tip and heel and a narrow area at the skate. More generally, the width of the tip is greater than that of the heel, which, in turn, is greater than that of the skate.
  • the edge line joining the tip to the heel called “dimension line”, is an essential characteristic of a ski. It varies from one manufacturer to another, in particular depending on the specific use envisaged. Thus, a slalom ski does not have the same dimension line as a downhill ski, just as that of a recreational ski is different from that of a competition ski.
  • This dimension line is of considerable importance in the practice of skiing. It is therefore important that during practice, it is not changed randomly during deformation of the ski.
  • the "neutral fiber” is the area where the compressive and tensile stresses cancel each other out. This fictitious area is determined according to the shapes and the internal composition of the beam. As a ski behaves like a beam, it follows that it has a “neutral fiber”, designated below (FN).
  • the mechanical reinforcements are generally located in the intermediate space, and this on either side of the neutral fiber, in particular to ensure good mechanization. To optimize the effectiveness of the reinforcements, it is important to position them as far as possible from the neutral fiber (FN), because in a calculation of bending stiffness, the distance from the reinforcement to the neutral fiber is squared.
  • FN neutral fiber
  • a ski is symmetrical relative to the plane of symmetry perpendicular to the plane of the sole and passing through the median longitudinal axis thereof.
  • asymmetrical skis that is to say skis whose shape and volume vary in thickness, length and width on one side to the other of the same ski, but whose rib line nevertheless remains symmetrical.
  • the manufacturers in order to keep a simple normal bending, that is to say without lateral bending or without parasitic torsion, were forced to design an opposite internal armed structure, correcting the dynamic effects of the asymmetry of shape .
  • the mechanization elements that is to say the reinforcements, are placed so that the bending stiffnesses are symmetrical with respect to in the median vertical plane passing through the median longitudinal axis of the sole.
  • the Applicant suggested inserting into the intermediate space filled with foam at least one possibly asymmetrical tubular reinforcement, perforated, disposed respectively in front and behind the skid area.
  • This embodiment aims to improve the guidance of the ski without stiffening it, to make it more comfortable.
  • it does not ensure optimal transmission of support on the edges, because as we know, it is at the level of the skate that these supports are most powerful.
  • the invention takes the opposite view to this rule in order to highlight the interesting effect of a controlled variation of the dimension line. It targets a ski, asymmetrical or not, which has the possibility of allowing the variation of the dimension line as a function of the impulse given by the skier or as a function of the conditions of use.
  • the invention aims to provide a flat strip embedded in the filling component of the intermediate space, generating during simple bending stresses, an asymmetrical deformation relative to the plane of symmetry passing through the longitudinal axis. median of the lower assembly (sole).
  • This strip extending from the first lower set towards the second upper set while defining an acute angle relative to the plane of the sole.
  • This flat strip characteristic of the invention being inclined relative to the plane of the sole, induces a lateral component during stresses normal to the plane of the sole.
  • flat strip is meant a thin solid strip, of flattened rectangular section, so that the deformation is exerted essentially on the two main parallel faces of this strip.
  • this inclined strip embedded in the foam filling the intermediate space is subjected to a force (or a support) perpendicular to the plane of the lower assembly, it generates, in addition to the usual bending of the ski, a lateral displacement by decomposition of efforts or forces.
  • the invention differs from the solutions mentioned in the preamble comprising reinforcements with symmetrical inclinations which, when they are stressed in deformation under a force normal to the sole, do not generate a lateral component, because they neutralize each other. It is distinguished from those comprising reinforcements with asymmetrical, different and / or opposite inclinations, by the fact that the latter contradict each other and therefore do not have any significant lateral component.
  • the characteristic flat strip extends from the spatula to the heel, and the inclination of this strip varies regularly from the spatula to the heel relative to the plane of the sole, respectively from zero degree to the level of the spatula and the heel, at 45 ° at the level of the skate.
  • the strip can also be formed of individual strips which are necessarily parallel, therefore of the same inclination (see FIGS. 5 and 10) in order to behave like a single strip.
  • the ski according to the invention is symmetrical, it can also be asymmetrical. Likewise, this ski can be of traditional form or of more complex form.
  • the inclination of the characteristic flat reinforcement strip is constant relative to the plane of the sole, but the width of this reinforcement varies along the ski, at the same time as the height of this ski.
  • the ski has several flat inclined reinforcing bands, of the same angle and of the same orientation relative to the plane of the sole, so that the deformations add up. Indeed, if the reinforcements were symmetrical with respect to the plane P, there would be cancellation of the lateral effects.
  • the characteristic inclined flat strip can be embedded in the intermediate space forming the core either by injection in situ or by assembly (wooden or rigid polyurethane core, or in honeycomb structure).
  • a core is made beforehand comprising the characteristic inclined flat strip, and the assembly is inserted in the intermediate space in a conventional manner.
  • FIGS 5 and 6 illustrate other embodiments of the invention.
  • FIGS 7 and 8 show schematically the operation of the invention.
  • Figure 9 shows the layout of a pair of skis.
  • FIGs 10,11,12 are three other forms of skis according to the invention.
  • the ski shown in FIG. 1 essentially comprises, in the longitudinal direction, a spatula (1), a central skid zone (2), and a heel (3).
  • this ski firstly comprises a first lower assembly, designated by the general reference (10), constituted by a flat sole (11), bordered on each of its two lateral sides by metal edges, respectively (12) and (13).
  • This lower assembly (10) has a plane of symmetry (P) perpendicular to the plane of the sole (11), passing through the median longitudinal axis (I-I ') of the ski and of the lower assembly (10).
  • the ski also comprises an upper assembly, designated by the general reference (15), formed of an actual top (16) and two lateral edges (17,18) bearing on the edges (12,13 ).
  • These two sets, respectively lower (10) and upper (15) define an intermediate space (20), delimited by the top of the sole (11), by the internal face of the edges (17,18) and by the internal face. from above (16).
  • This intermediate space (20) comprises the neutral fiber shown diagrammatically by the axis (FN), parallel to the plane of the sole (11).
  • this neutral fiber (FN) is at the ends (1) and (3) parallel to the plane of the sole (11) and is located substantially equidistant from this plane of the sole (11), and from the plane from above (16).
  • the intermediate space (20) comprises a solid solid flat strip of reinforcement (25) inclined, going from the tip (1) to the heel (3).
  • This flat strip (25) is made for example of metal or of fibrous composite material of common application in the ski area.
  • This characteristic reinforcement strip (25) extends from practically the tip (1) to the heel (2) with an inclination which varies regularly with respect to the plane of the sole (11), namely from zero degree to the level of the spatula (1) and the heel (3), at 45 ° at the level of the pad (2).
  • This variation in the inclination of the flat strip (25) is progressive and continuous.
  • this characteristic flat strip (25) is made of aluminum alloy commonly used in skiing called ZICRAL (registered trademark PECHINEY-CEGEDUR) 120 centimeters long, 30 millimeters wide and 0.8 millimeter thick. To allow the passage of the components of the injected foam, this strip (25) is perforated with a multitude of holes of 4 millimeters in diameter.
  • ZICRAL registered trademark PECHINEY-CEGEDUR
  • this characteristic strip (25) extends practically from the lower edge of the ski, namely the edge (12), near the lower assembly (10), up to 'at the opposite edge of the ski, near the upper assembly (15).
  • the intermediate space (20) is filled with a filling material, such as for example a polyurethane foam.
  • the width of the characteristic reinforcing flat strip (25) can also vary from the tip (1) to the shoe (2), then from this area to the heel (3). As already said, it is important that this inclined strip (25) is massive and possibly perforated.
  • the intermediate space (20) filled with foam comprises two inclined reinforcements (30) and (31) similar to (25), which also vary from zero to 45 degrees, from the spatula or the heel to the skate.
  • these two inclined reinforcements (30,31) are parallel, extend from the sole (11) to the top (16) by defining an angle of at most 45 ° relative to the plane of the sole, and are arranged asymmetrically with respect to the plane P by cutting the neutral fiber (FN).
  • the intermediate space (20) comprises a neutral core (35) commonly used for this application, for example made of wood, into which an inclined reinforcement (40) is inserted. similar to (25,30 or 31).
  • the rest of the intermediate space (20) is in known manner filled with polyurethane foam.
  • this core (35) reinforced by the inclined strip (40) can occupy the entire intermediate space (20).
  • the maximum width of the ski L1 at the tip is eighty-six millimeters, the maximum width L3 at the heel of eighty millimeters and the minimum width L2 at the sixty-two millimeter shoe (2).
  • FIG. 7 is a schematic representation of this ski (200) at the level of the skate, first shown in dashed lines, at rest (201), and then, under the action of a load F normal to the surface of the sole, corresponding to the weight of a skier.
  • the characteristic strip of the invention (25) being inclined by 45 °, this load F is transformed into two components, respectively a normal component F1 and a lateral component F2.
  • the ski deforms so that the lower edge (131) of the ski (201) at rest will become the edge (130) of the ski (200) under load. This edge (130,131) will move in normal bending of an arrow f1 and in lateral bending of a displacement f2.
  • the ski did not have the characteristic inclined reinforcing strip (25) under the effect of the same load F normal to the surface of the sole, it would retain a normal deflection g1 greater than f1, but would not have lateral displacement.
  • FIG. 8 shows, in top view, the ski according to the invention, in two positions, respectively at rest in mixed lines with its edge lines (121) and (131), and under load in solid lines, with its two lines of edges (120) and (130).
  • the lateral displacement f2 is, in this case, assimilated to a modification of the dimension line of the ski which from (121) to (120), will widen even more, while on the opposite side (131) and (130), this dimension line tends to become more rectilinear, that is to say flatter.
  • the skier will exert on the internal edge a significant pulse F which is broken down into F1 and F2. This causes a change in the dimension line at the level of the skate.
  • the ski outside the turn which receives the force F will see its coast line widen at the level of the skate. It follows a reduction in the radius of curvature of the turn, favorable to the practice of special slalom.
  • a pair of skis comprises two skis, respectively the left designated by the general reference (G) and the right designated by the reference (D). These skis are symmetrical with respect to a plane M passing between them.
  • the inclined characteristic bands (25) descend from left to right on the left ski G1 and rise from left to right on the right ski D, so that the directions of the two reinforcing bands (25) are cross on the M plane, below the skis.
  • the ski according to the invention has become interactive, since it is modified according to need.
  • FIG. 10 illustrates a ski according to the invention in which the reinforcing bands (50-53) are inclined at a constant angle and are arranged in pairs on either side of the neutral fiber FN.
  • FIG. 11 shows another variant of the invention in which the entire intermediate space (60) provides the inclined reinforcement function.
  • This space (60) is occupied by an asymmetrical reinforcement core with respect to the plane P of symmetry of the lower assembly, that is to say of which the fibers which form reinforcement have an inclination ⁇ .
  • This core can be made of wood with its inclined fibers or of glued laminated wood, so that the lamellar stack of fibers is inclined by this value ⁇ .
  • FIG. 12 shows a ski of particular shape in which the reinforcing strip (70) asymmetrical to the plane (P) is glued against the shell (26), inside the intermediate space (20) filled with polyurethane foam .

Landscapes

  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Lubricants (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Polyesters Or Polycarbonates (AREA)
EP94420325A 1993-11-30 1994-11-22 Ski Expired - Lifetime EP0661086B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9314562 1993-11-30
FR9314562A FR2713100B1 (fr) 1993-11-30 1993-11-30 Ski.

Publications (2)

Publication Number Publication Date
EP0661086A1 true EP0661086A1 (de) 1995-07-05
EP0661086B1 EP0661086B1 (de) 1998-02-18

Family

ID=9453568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94420325A Expired - Lifetime EP0661086B1 (de) 1993-11-30 1994-11-22 Ski

Country Status (5)

Country Link
US (1) US5492357A (de)
EP (1) EP0661086B1 (de)
AT (1) ATE163271T1 (de)
DE (1) DE69408568T2 (de)
FR (1) FR2713100B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011001173U1 (de) 2010-11-15 2011-03-17 Elan Skupina Holdinška Družba, D.O.O. Ski mit asymmetrischen Charakteristiken

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5782482A (en) * 1996-01-30 1998-07-21 K-2 Corporation Snowboard and method of construction
DE29713628U1 (de) * 1997-07-31 1998-11-26 Robert Bosch Gmbh, 70469 Stuttgart Kraftstoffeinspritzdüse
WO1999016514A1 (en) * 1997-09-26 1999-04-08 Volant Sports L.L.C. Snowboard with selectively added structural components
FR2810560B1 (fr) * 2000-06-23 2002-10-11 Salomon Sa Planche a roulette

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589745A1 (fr) * 1985-11-08 1987-05-15 Schmalkalden Sport Veb Ski pour le ski de fond, le ski de randonnee et le ski alpin
FR2611517A1 (fr) * 1987-02-27 1988-09-09 Salomon Sa Ski a caisson profile
EP0284878A1 (de) * 1987-03-17 1988-10-05 VEB Kombinat Sportgeräte Schmalkalden Leichtbaukern, insbesondere Stützkern in einem Ski

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH152918A (de) * 1931-02-28 1932-02-29 Aluminium Ind Ag Ski aus Leichtmetall-Legierung und Verfahren zur Herstellung desselben.
US2581532A (en) * 1946-08-23 1952-01-08 Arne G Hem Ski
FR1290278A (fr) * 1961-03-01 1962-04-13 Procédé de fabrication des skis et skis obtenus par ledit procédé
FR87478E (fr) * 1965-03-04 1966-05-06 Plastiques Synthetiques Ski perfectionné
FR1435153A (fr) * 1965-03-04 1966-04-15 Plastiques Synthetiques Ski perfectionné en matière plastique
US3722901A (en) * 1970-02-14 1973-03-27 Nippon Musical Instruments Mfg Ski having a hard type foamed resin core
DE2063167B2 (de) * 1970-12-22 1974-10-31 Maschinenfabrik Augsburg-Nuernberg Ag, 8000 Muenchen Ski
JPS4949574A (de) * 1972-09-14 1974-05-14
AT383496B (de) * 1985-02-25 1987-07-10 Head Sportgeraete Gmbh Ski
DD242178B1 (de) * 1985-11-08 1989-12-27 Sportgeraete Veb K Kunststoffski
US5108124A (en) * 1986-05-23 1992-04-28 Salomon S.A. Ski having improved sliding and gripping properties
JPH03297479A (ja) * 1990-04-17 1991-12-27 Yamaha Corp スキー板、並びに該スキー板に用いられる中芯体の製法及びスキー板の製法
FR2687924B1 (fr) * 1992-02-28 1994-08-26 Rossignol Sa Ski possedant un renfort tubulaire ajoure.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589745A1 (fr) * 1985-11-08 1987-05-15 Schmalkalden Sport Veb Ski pour le ski de fond, le ski de randonnee et le ski alpin
FR2611517A1 (fr) * 1987-02-27 1988-09-09 Salomon Sa Ski a caisson profile
EP0284878A1 (de) * 1987-03-17 1988-10-05 VEB Kombinat Sportgeräte Schmalkalden Leichtbaukern, insbesondere Stützkern in einem Ski

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011001173U1 (de) 2010-11-15 2011-03-17 Elan Skupina Holdinška Družba, D.O.O. Ski mit asymmetrischen Charakteristiken
WO2012067589A1 (en) 2010-11-15 2012-05-24 Elan Skupina, Holdinska Druzba, D.O.O. Ski having asymmetric characteristics

Also Published As

Publication number Publication date
ATE163271T1 (de) 1998-03-15
EP0661086B1 (de) 1998-02-18
FR2713100A1 (fr) 1995-06-09
DE69408568T2 (de) 1998-06-25
DE69408568D1 (de) 1998-03-26
US5492357A (en) 1996-02-20
FR2713100B1 (fr) 1996-01-05

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