EP4309751B1 - Alpinski mit verbesserter seitenlinie - Google Patents

Alpinski mit verbesserter seitenlinie

Info

Publication number
EP4309751B1
EP4309751B1 EP23185413.4A EP23185413A EP4309751B1 EP 4309751 B1 EP4309751 B1 EP 4309751B1 EP 23185413 A EP23185413 A EP 23185413A EP 4309751 B1 EP4309751 B1 EP 4309751B1
Authority
EP
European Patent Office
Prior art keywords
line
ski
curvature
contact line
zone
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.)
Active
Application number
EP23185413.4A
Other languages
English (en)
French (fr)
Other versions
EP4309751A1 (de
Inventor
Jean-Luc Dutaut
Pierre Billon
Romain Bailly
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 EP4309751A1 publication Critical patent/EP4309751A1/de
Application granted granted Critical
Publication of EP4309751B1 publication Critical patent/EP4309751B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • A63C5/052—Structure of the surface thereof of the tips or rear ends

Definitions

  • the invention relates to the field of snow sports equipment, and in particular alpine skis.
  • an alpine ski has different zones distributed along its length: a tip zone at the front, curved upwards to overcome obstacles; a tail zone at the rear of the ski, also slightly upturned; and a waist zone extending between the tip and tail.
  • the waist zone provides the ski's glide via its underside, which is formed by a glide base bordered by edges, and on its upper side, it receives the mounting elements for the safety binding.
  • skis exhibit symmetry about their median longitudinal plane, which extends from the front to the rear of the ski.
  • the sidecut is defined as the line that represents the lateral contour of the ski, which may be more or less deep.
  • a "rear contact line” and a “front contact line” are defined on the ski, which are the front and rear limits of the contact surface of the underside when the ski is applied to a flat surface, in particular by loading the ski at the waist to cancel its camber.
  • a sidecut is defined between the two widest points of the ski, located at the front and the rear.
  • a trend has been observed towards alpine skis where the widest point is located beyond the front contact line, so that the ski widens somewhat in the tip section before reaching the front point. of the ski.
  • the same trend can be seen for the rear part of the ski, with a wider rear line, which can be located further back than the rear contact line, therefore inside the heel area.
  • skis are designed to have a sidecut in the waist area that fits into a circle, so that the radius of curvature of the sidecut is generally constant over the entire waist, with a well-localized center of curvature, causing the tracing of curves to be roughly centered on this point.
  • an alpine ski comprising a tip area located at the front of the ski, a waist area, and a tail area located at the rear of the ski, a median longitudinal plane extending from the front to the rear of the ski, and an underside formed by a glide base bordered by edges.
  • this ski includes a binding mounting area, the position of which is determined by a "mounting point" ( PM ), as defined in ISO 6289 and ISO 5355 standards.
  • This mounting point is intended to be aligned longitudinally with a reference mark present on the The shoe is held in place by the binding, which is located at the level of a midline of the shoe ( MC ).
  • the mounting point and the midline of the shoe are assumed to be at the same longitudinal level, and are therefore coincident on this plane.
  • the width of the ski at the boundary between the waist and the tail is greater than the same width measured at the boundary between the waist and the tip.
  • the width of the gliding zone is greater behind the waist than in front of it.
  • the minimum width zone (P III ) of the ski is located further forward than the middle line of the boot ( MC ).
  • the radius of curvature has a maximum value at a transverse line located strictly between the front contact line ( PA ) and the rear contact line ( PB ).
  • the ratio between the maximum radius of curvature value and the radius of curvature value at the front contact line is greater than 2.5, preferably greater than 3.
  • the invention consists of giving the ski a particular geometry in which the radius of curvature is highly variable between the front contact line and the rear contact line, with a very marked maximum, i.e. a relatively low curvature in this area, compared to the curvature measured near the heel and the tip.
  • the ski according to the invention has a relatively straight sidecut in the area where the boot is located, whereas, on the contrary, as you approach the front and rear contact lines, i.e. the ends of the ski, you find a more pronounced curvature, ensuring the hollowing of the sidecut.
  • ski performance is significantly improved and advantageous in competition, while maintaining forgiving handling of uneven terrain, when the ratio between the maximum turning radius and the larger of the two turning radii at the front and rear contact lines exceeds 2.5.
  • This ratio can be even higher, exceeding 3, or even 4 for advanced competition skis.
  • a particularly advantageous geometry is one in which the difference between the very large turning radius at the center of the waist zone and the larger of the relatively small turning radii at the front or rear contact line is greatest.
  • the Applicant observed that this geometry is particularly advantageous when the boot's centerline is slightly set back from the ski's narrowest point.
  • the ski's narrowest point is located in front of the boot's centerline.
  • the ski's performance is further improved when the area of very low camber is positioned in front of the boot's centerline, notably for ease of initiating turns and entering curves.
  • the difference between the width at the front contact line (PA) and the width at the rear contact line (PB) is between 2 and 10 mm
  • the distance between the minimum width zone (PIII) and the shoe center line (MC) is greater than 2 mm, preferably 5 mm, and less than or equal to 100 mm.
  • the variation of the radius of curvature of the dimension line according to the longitudinal position of the measurement point is a function whose second derivative with respect to said longitudinal position is positive for a longitudinal position between the rear contact line and the front contact line.
  • the radius of curvature along the sidewall is measured in such a way that it increases progressively from the rear contact point towards the point of minimum curvature. Conversely, it decreases from the point of minimum curvature towards the front contact point. Put another way, the variation in the radius of curvature increases from the rear contact point towards the point of minimum curvature, and this same variation decreases from the point of minimum curvature towards the vicinity of the front contact line.
  • the transverse line where the radius of curvature is maximum is located approximately at the narrowest point of the ski (P III ).
  • the narrowest point of the ski corresponds almost exactly, within 5 millimeters, to the point where the curvature is the least, and where the sidecut is closest to a straight profile.
  • a ski has dimensional parameters that are defined according to the ISO 6289 standard.
  • the ski 1 has a tip area 2 at the front and a tail area 3 at the rear, separated by the central area 4, also called the waist area.
  • the central area 4 also called the waist area.
  • this ski 1 When this ski 1 is loaded, that is, when it bears the weight of a user such that the camber of the waist zone 4 is opposed, the glide base comes into contact with the horizontal plane 10 on a glide zone.
  • This glide zone 12 defined between two particular lines which are the front contact line P A , marking the rear boundary of the spatula 2, and the rear contact line P B forming the front boundary of the heel area 3.
  • the ski 1 has a width that varies from the tail 3 to the tip 2. This width, measured perpendicular to the median longitudinal plane along the Oy axis, has localized extremes. Thus, in the tail 3 area, the ski 1 has a maximum width at point P II . In the embodiment illustrated in the figures, it should be noted that this point P II is located behind point PB, which corresponds to the rear contact line. On the other side of the ski, it has a maximum width at point P I , at a level located further forward than the front contact line PA .
  • the ski also has a minimum width in the skating area, at point P III .
  • the Applicant observed a particular behavior when the ski's width at point P ⁇ sub> B ⁇ /sub>, at the rear contact line near the tail, is greater than its width at point P ⁇ sub> A ⁇ /sub>, at the front contact line near the tip.
  • this difference in width (L ⁇ sub>PB ⁇ /sub> - L ⁇ sub>PA ⁇ /sub> ) can be on the order of 2 to 10 millimeters, resulting in a behavior on snow that favors pivoting and allows for greater tolerance of terrain imperfections.
  • the ski has an area where the safety binding is designed to be mounted, in order to accommodate the user's boot.
  • This area is marked by the dotted line in region 20 on the figure 3 , and essentially defined by the line MC corresponding to the middle of the shoe.
  • This point MC allows in particular to position the heel piece and the toe piece of the binding symmetrically, with respect to this point MC , to take into account the user's shoe size, or the implantation of a platform in which the toe piece and the heel piece of the binding are adjustable in position.
  • this gap can be greater than 2 mm, or even greater than 5 mm, and preferably between 5 and 15 mm. This parameter facilitates the ski's entry into the turn at the beginning of the turn.
  • the skis conforming to the invention have a particular geometry, especially with regard to the radius of curvature RC of the sidecut.
  • this radius of curvature can be measured from the variation in the ski's width, measured along the longitudinal direction Ox.
  • the curvature and the radius of curvature which is the inverse of the curvature
  • the second derivative of the ski width measurement curve yields the curve representing the ski's curvature along the sidecut.
  • other practical methods can be used to calculate this radius of curvature, particularly by using mechanical devices that are moved along the sidecut.
  • the radius of curvature exhibits a specific variation such that it has a maximum value R MAX located close to, or even coinciding with, the point of smallest width P III .
  • the value of the maximum radius of curvature is particularly high, exceeding 35 m, or even 50 m, preferably between 50 and 80 m. This maximum value allows, in particular, the adjustment of the degree of grip of the ski.
  • the radius of curvature is significantly smaller the closer you get to the tips of the ski.
  • the radii of curvature are between 5 and 20 m, preferably between 10 and 20 m.
  • the evolution of the radius of curvature is also specific for skis conforming to the invention, since, as can be seen in the figure 4 , the second derivative of the radius of curvature calculated along the OX axis is such that it is always positive, meaning that the closer one gets to the point where the radius of curvature is maximum, the more rapidly this radius of curvature increases.
  • the geometry of the skis according to the invention is particularly advantageous for its performance qualities on snow while remaining easy to handle. More specifically, these skis offer easy turn initiation and a distribution of pressure along the entire length of the ski, preventing excessive edge grip. Such skis have a narrower tip, making them easier to maneuver as they do not generate unwanted edge grip at the front.

Landscapes

  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Claims (8)

  1. Alpinski (1), der einen spatelartigen Bereich (2), welcher sich an der Vorderseite des Skis befindet, einen Auflagebereich (4), und einen Fersenbereich (3), welcher sich an der Hinterseite des Skis befindet, eine Mittellängsebene, welche sich vom vorderen Ende des Skis zum hinteren Ende des Skis erstreckt, eine Unterseite, welche von einem Laufbelag (7) gebildet wird, der von Kanten gesäumt ist, einen Bereich zum Anbringen eines Schuhs (20) aufweist, dessen Mitte sich gemäß der Längsrichtung auf Höhe einer Schuhmittellinie (MC) befindet, wobei er weiterhin eine Seitenlinie besitzt, die Folgendes aufweist:
    - eine vordere Kontaktlinie (PA), die als Kontaktlinie zwischen dem Laufbelag (7) und einer horizontalen Fläche (12) definiert ist, an welcher der Belag anliegt, wenn die Auflage (4) belastet ist, wobei sie sich am weitesten vorn befindet,
    - eine hintere Kontaktlinie (PB), die als Kontaktlinie zwischen dem Laufbelag (7) und der horizontalen Fläche definiert ist, wobei sie sich am weitesten hinten befindet,
    - eine vordere Linie der größten Breite (PI), die sich auf Höhe der vorderen Kontaktlinie (PA) oder noch davor befindet,
    - eine hintere Linie der größten Breite (PII), die sich auf Höhe der hinteren Kontaktlinie (PB) oder noch dahinter befindet,
    - einen Bereich der geringsten Breite (PIII), der sich im Auflagebereich befindet,
    wobei Seitenlinie zwischen der vorderen Kontaktlinie (PA) und der hinteren Kontaktlinie (PB) eine variable Krümmung aufweist,
    wobei
    - die Breite des Skis, wenn sie rechtwinklig zur Mittellängsebene gemessen wird, auf Höhe der vorderen Kontaktlinie (PA) streng kleiner als die Breite des Skis ist, welche auf Höhe der hinteren Kontaktlinie (PB) gemessen wird, und der Bereich der geringsten Breite (PIII) sich weiter vorn als die Schuhmittellinie (MC) befindet ; dadurch gekennzeichnet, dass
    - der Krümmungsradius auf Höhe einer Querlinie, welche sich streng zwischen der vorderen Kontaktlinie (PA) und der hinteren Kontaktlinie (PB) befindet, einen Höchstwert (RMAX) annimmt,
    - das Verhältnis zwischen dem Höchstwert des Krümmungsradius (RMAX) und dem Wert des Krümmungsradius auf Höhe der vorderen Kontaktlinie mehr als 2,5, vorzugsweise mehr als 3 beträgt.
  2. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass die Abweichung zwischen der Breite der vorderen Kontaktlinie (PA) und der Breite der hinteren Kontaktlinie (PB) im Bereich von 2 bis 10 mm liegt.
  3. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass der Abstand zwischen dem Bereich der geringsten Breite (PIII) und der Schuhmittellinie (MC) mehr als 2 mm, vorzugsweise als 5 mm, beträgt.
  4. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass der Abstand zwischen dem Bereich der geringsten Breite (PIII) und der Schuhmittellinie (MC) höchstens 100 mm beträgt.
  5. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis zwischen dem Höchstwert des Krümmungsradius (RMAX AV) und dem größeren der beiden Krümmungsradien (RMAX AV, RMAX AR) auf Höhe der vorderen und hinteren Kontaktlinien mehr als 4 beträgt.
  6. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass der Höchstwert des Krümmungsradius (RMAX) mehr als 35 m beträgt.
  7. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass die Veränderung des Krümmungsradius (RC) der Seitenlinie gemäß der Position des Messpunktes in Längsrichtung einer Funktion entspricht, deren zweite Ableitung gegenüber der Position in Längsrichtung für eine Position in Längsrichtung, die sich zwischen der hinteren Kontaktlinie (PB) und der vorderen Kontaktlinie (PA) befindet, einen positiven Wert annimmt.
  8. Alpinski nach Anspruch 1, dadurch gekennzeichnet, dass die Querlinie, an welcher der Krümmungsradius seinen Höchstwert erreicht, sich näherungsweise an der schmalsten Stelle (PIII) des Skis befindet.
EP23185413.4A 2022-07-20 2023-07-13 Alpinski mit verbesserter seitenlinie Active EP4309751B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2207412A FR3138044A1 (fr) 2022-07-20 2022-07-20 Ski alpin a ligne de cote amelioree

Publications (2)

Publication Number Publication Date
EP4309751A1 EP4309751A1 (de) 2024-01-24
EP4309751B1 true EP4309751B1 (de) 2025-11-26

Family

ID=84053417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23185413.4A Active EP4309751B1 (de) 2022-07-20 2023-07-13 Alpinski mit verbesserter seitenlinie

Country Status (3)

Country Link
US (1) US12502594B2 (de)
EP (1) EP4309751B1 (de)
FR (1) FR3138044A1 (de)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2936368A1 (de) * 1979-09-08 1981-04-02 Müller + Müller, Basel Schneegleiter
FR2612792A1 (fr) * 1987-03-23 1988-09-30 Bossois Philippe Surf des neiges polyvalent avec dispositifs directionnels
US6357782B1 (en) * 1998-06-25 2002-03-19 Fischer Geserllschaft M.B.H. Cross-country ski
US6102428A (en) * 1998-12-04 2000-08-15 Skis Rossignol, S.A. Assembly for gliding on snow
FR2908665B1 (fr) * 2006-11-22 2009-03-20 Salomon Sa Ski
FR2926734B1 (fr) * 2008-01-25 2011-08-26 Rossignol Sa Planche de glisse sur neige
DE102008034293A1 (de) * 2008-07-22 2010-01-28 Marker Völkl (International) GmbH Ski, insbesondere Abfahrtski
FR2955262B1 (fr) * 2010-01-21 2011-12-30 Rossignol Sa Planche de surf des neiges
FR2985914B1 (fr) * 2012-01-19 2014-01-03 Rossignol Sa Planche de glisse

Also Published As

Publication number Publication date
US12502594B2 (en) 2025-12-23
EP4309751A1 (de) 2024-01-24
US20240024758A1 (en) 2024-01-25
FR3138044A1 (fr) 2024-01-26

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