EP4309751A1 - Alpinski mit verbesserter seitenlinie - Google Patents

Alpinski mit verbesserter seitenlinie Download PDF

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Publication number
EP4309751A1
EP4309751A1 EP23185413.4A EP23185413A EP4309751A1 EP 4309751 A1 EP4309751 A1 EP 4309751A1 EP 23185413 A EP23185413 A EP 23185413A EP 4309751 A1 EP4309751 A1 EP 4309751A1
Authority
EP
European Patent Office
Prior art keywords
line
ski
contact line
zone
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23185413.4A
Other languages
English (en)
French (fr)
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
Pending 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
    • 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 sliding boards, and in particular alpine skis.
  • an alpine ski has different zones distributed along its length, namely a tip zone located at the front, and curved upwards to overcome obstacles, a heel zone, located at the rear of the ski, and slightly also raised, as well as a skate zone extending between the heel and the tip.
  • the skate ensures the ski's gliding through its lower face, formed of a gliding sole lined with edges, and receiving on the upper face the mounting elements of the safety binding.
  • the skis have symmetry with respect to their median longitudinal plane, which extends from the front end to the rear end of the ski.
  • the sidecut is defined as the line which represents the lateral contour of the ski, which can be more or less hollowed out.
  • a “rear contact line” and a “front contact line” which are the front and rear limits of the contact surface of the lower face when the ski is applied to a flat surface, in particular by loading the ski at the level of the waist to cancel its camber.
  • skis are made to have a sidecut in the skate area which is inscribed on a circle, so that the radius of curvature of the sidecut is generally constant over the entire skate, with a center of well-localized curvature, causing the drawing of curves substantially centered on this point.
  • This configuration is therefore not necessarily compatible with a search for performance, particularly when practicing ski racing.
  • an alpine ski comprising a spatula zone located at the front of the ski, a waist zone, and a heel zone located at the rear of the ski, a median longitudinal plane extending from the front end to the rear end of the ski, a lower face formed by a gliding sole lined with edges.
  • this ski includes a binding installation zone, the position of which is determined by a “mounting point” (P M ), within the meaning of the ISO 6289 and ISO 5355 standards.
  • This mounting point is intended to be aligned longitudinally with a mark present on the shoe held by the binding, which is located at the level of a mid-shoe line (M C ).
  • M C mid-shoe line
  • the assembly point and the mid-line of the shoe are assumed to be at the same longitudinal level, and are therefore merged on this plane.
  • this ski is characterized in that the width of the ski, measured perpendicular to the median longitudinal plane, at the level of the front contact line (P A ) is strictly less than the width of the ski measured at the level of the rear contact line (P B ).
  • the width of the ski at the border between the skate and the tail is greater than the same width measured at the border between the skate and the tip.
  • the width of the sliding zone is greater behind than in front of the skating zone.
  • the minimum width zone (P III ) of the ski is located further forward than the mid-boot line (M C ).
  • the ski according to the invention has a relatively rectilinear sidecut in the area where the boot is located, whereas on the contrary, by approaching the front and rear contact lines, it is say from the ends of the skate, we find a more marked curvature, ensuring the deepening of the sidecut.
  • the behavior of the ski is all the more efficient and advantageous in competition, while maintaining a ski tolerant of terrain imperfections, when the ratio between the maximum radius of curvature value and the largest of the two radii of curvature at the front and rear contact lines is greater than 2.5.
  • This ratio can be even higher, greater than 3, or even 4 for advanced competition skis.
  • a particularly interesting geometry is that in which the difference between the very strong radius of curvature at the center of the shoe zone and the strongest of the relatively small radii of curvature at the level of the front or rear contact line is Most important.
  • this geometry is particularly advantageous when the middle line of the shoe is located slightly behind the narrowest area of the ski.
  • the narrow point of the ski is located in front of the middle mark of the boot.
  • the behavior of the ski is further improved as the region with very low curvature is therefore located in front of the mid-boot line, particularly for the ease of initiating the turn and entering a curve.
  • the variation of the radius of curvature of the dimension line according to the longitudinal position of the measuring 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 measurement of the radius of curvature along the coast line is such that its increase is increasing moving from the rear contact point towards the maximum. And this decrease is also increasing from its maximum to the front contact point.
  • the variation in the radius of curvature increases from the rear contact point to the point of minimum curvature, and this same variation attenuates from this maximum to the vicinity of the front contact line. .
  • the transverse line where the radius of curvature is maximum is located approximately at the level of the narrowest point of the ski (P III ).
  • the narrow point of the ski corresponds approximately, to within 5 millimeters, to the point where the curvature is the weakest, and where the sidecut is closest to a rectilinear profile.
  • an Oxyz coordinate system as well as xy, yx and xz planes defined from the non-collinear x, y and z vectors of the Oxyz coordinate system.
  • the forward direction corresponds to the longitudinal direction of the ski along the Ox axis, oriented from the skate towards the tip.
  • a ski has dimensional parameters which are defined according to the ISO 6289 standard.
  • the ski 1 has a tip zone 2 at the front and a tail zone 3 at the rear separated by the central zone 4, also called the skate zone.
  • the camber which it presents at the level of the skate zone causes it to come into contact with this horizontal plane at the level of two specific points 5;6 in forward and backward.
  • this ski 1 when this ski 1 is loaded, that is to say it undergoes the weight of a user such that the camber of the skate zone 4 is upset, the gliding sole comes into contact with the horizontal plane 10 on a sliding zone.
  • This sliding zone 12 defined between two particular lines which are the front contact line P A , marking the rear border of the tip 2 , and the rear contact line P B forming the front border of the heel zone 3.
  • the ski 1 has a width which is variable from the heel 3 to the tip 2. This width, measured perpendicular to the median longitudinal plane, along the axis Oy has localized extrema.
  • the ski 1 has a maximum width at the point P II .
  • this point P II is located behind the point P B corresponding to the rear contact line.
  • On the other side of the ski it has a maximum width at the point P I , at a level located further forward than the front contact line P A.
  • the ski also has a minimum width in the waist zone, at the Pm point.
  • the Applicant noted that a particular behavior could be observed when the width of the ski at point P B of the ski, at the level of the rear contact line, near the heel area, is greater than the width of the ski at point P A of the ski, at the level of the front contact line, near the tip zone. More precisely, this difference in width (LP B - LP A ) can be of the order of 2 to 10 millimeters, and leads to behavior on snow which favors the pivoting of the ski and allows it to be more tolerant of the imperfections of the ski. ground.
  • the ski has a zone in which the safety binding is intended to be installed, in order to accommodate the user's shoe.
  • This zone is marked by region 20 in dotted lines on the Figure 3 , and essentially defined by the line M C corresponding to the middle of the shoe.
  • This point M C makes it possible in particular to position the heel piece and the stop of the binding symmetrically, in relation to this point M C , to take into account the user's size, or the installation of a platform in which the toe and heel of the binding are adjustable in position.
  • the Applicant has noted the advantage of a configuration in which the zone of minimum width P III is located further forward than the middle line of shoes M C.
  • this gap may be greater than 2 mm, or even greater than 5 mm, and preferably between 5 and 15 mm. This parameter makes it easier to enter the ski into the curve at the start of the turn.
  • the skis in accordance with the invention have a particular geometry, particularly with regard to the radius of curvature R C of the sidecut.
  • this radius of curvature can be measured from the variation in the width of the ski, measured in the longitudinal direction Ox.
  • the second derivative of the ski width measurement curve makes it possible to obtain the curve giving the curvature of the ski along the dimension line.
  • other practical methods can be implemented for calculating this radius of curvature, in particular using mechanical devices which are moved along the coast line.
  • the radius of curvature presents a specific variation such that it presents a maximum value R MAX located close to, or even confused with, the point of smallest width P III .
  • the value of the maximum curvature radius is particularly high, greater than 35 m, or even 50 m, preferably between 50 and 80 m. This maximum value makes it possible in particular to adjust the degree of grip of the ski.
  • the radius of curvature is significantly lower the further you move towards the ends 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 axis O .
  • the geometry of the skis according to the invention is particularly advantageous for its performance qualities on snow while remaining easy. More precisely, these skis have ease of entry into turns, a distribution of the support pressure over the entire length of the ski which makes it possible to avoid over-hanging points. Such skis have a spatula which is less wide, and therefore easier to handle because it does not generate unwanted snagging on the front.
EP23185413.4A 2022-07-20 2023-07-13 Alpinski mit verbesserter seitenlinie Pending EP4309751A1 (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 (1)

Publication Number Publication Date
EP4309751A1 true EP4309751A1 (de) 2024-01-24

Family

ID=84053417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23185413.4A Pending EP4309751A1 (de) 2022-07-20 2023-07-13 Alpinski mit verbesserter seitenlinie

Country Status (3)

Country Link
US (1) US20240024758A1 (de)
EP (1) EP4309751A1 (de)
FR (1) FR3138044A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925344A1 (de) * 2006-11-22 2008-05-28 Salomon S.A. Skiprofil Kurve
EP2082787A1 (de) * 2008-01-25 2009-07-29 Skis Rossignol Schneegleitbrett für Pulverschnee
EP2147703A1 (de) * 2008-07-22 2010-01-27 Marker Völkl International GmbH Ski, insbesondere Abfahrtski
EP2617475A1 (de) * 2012-01-19 2013-07-24 Skis Rossignol Taillierung eines Gleitbretts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925344A1 (de) * 2006-11-22 2008-05-28 Salomon S.A. Skiprofil Kurve
EP2082787A1 (de) * 2008-01-25 2009-07-29 Skis Rossignol Schneegleitbrett für Pulverschnee
EP2147703A1 (de) * 2008-07-22 2010-01-27 Marker Völkl International GmbH Ski, insbesondere Abfahrtski
EP2617475A1 (de) * 2012-01-19 2013-07-24 Skis Rossignol Taillierung eines Gleitbretts
FR2985914A1 (fr) 2012-01-19 2013-07-26 Rossignol Sa Planche de glisse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYME: "ISO 6289:2003 skis - vocabulaire", INTERNATIONAL STANDARD - ISO, ZUERICH, CH, 15 August 2003 (2003-08-15), pages complete, XP002425472 *

Also Published As

Publication number Publication date
FR3138044A1 (fr) 2024-01-26
US20240024758A1 (en) 2024-01-25

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