EP3842105A1 - Gleitbrett mit unidirektionalem rückhaltesystem - Google Patents

Gleitbrett mit unidirektionalem rückhaltesystem Download PDF

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Publication number
EP3842105A1
EP3842105A1 EP20213870.7A EP20213870A EP3842105A1 EP 3842105 A1 EP3842105 A1 EP 3842105A1 EP 20213870 A EP20213870 A EP 20213870A EP 3842105 A1 EP3842105 A1 EP 3842105A1
Authority
EP
European Patent Office
Prior art keywords
ski
resilient layer
braking
layer
friction
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
EP20213870.7A
Other languages
English (en)
French (fr)
Inventor
Thomas Saillet
Benoît ABEL
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.)
Salomon SAS
Original Assignee
Salomon SAS
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 Salomon SAS filed Critical Salomon SAS
Publication of EP3842105A1 publication Critical patent/EP3842105A1/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
    • A63C5/056—Materials for the running sole
    • 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
    • A63C5/0428—Other in-relief running soles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C7/00—Devices preventing skis from slipping back; Ski-stoppers or ski-brakes
    • A63C7/02—Skins; Substitutes for skins
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C7/00—Devices preventing skis from slipping back; Ski-stoppers or ski-brakes
    • A63C7/06—Tooth-shaped running sole-plates

Definitions

  • the present invention relates to a gliding board equipped with a braking device.
  • the present invention relates to a cross-country ski equipped with anti-recoil means placed under a central portion thereof, at its sliding surface.
  • anti-recoil means can take several forms. For example, they can consist of the placement of an anti-slip material called “wax” which is applied only in the central zone of the sole of the ski, commonly called “wax chamber”. These means may also consist of a strip providing uni-directional braking which is fixed under the gliding sole of the ski.
  • the band consists of anti-recoil means associated with fixing means, the latter making it possible to keep the anti-recoil means in place under the sole of the ski.
  • the fixing means generally consist of an adhesive but can also take the form of mechanical or magnetic means.
  • the anti-recoil means are most often made of a pile, the projecting fibers of which are all oriented in such a way that in a first directional direction, they strongly restrict the sliding while in the directional direction opposite to the first direction, they do not. do not interfere or little.
  • a cross-country ski has a camber such that, in the free state and up to a certain stress made in its center, the central portion of its sliding surface is not in contact with the snow.
  • the value of the camber as well as the rigidity of the ski are normally adapted to the weight of the user in such a way that, during the progression of the skier, the transfer of his weight from one leg to the other has the effect of tackling against the snow the central portion of the ski of the support leg and move away from the snow the central portion of the other ski.
  • camber of a cross-country ski is also chosen according to the practice. Indeed, cross-country skis dedicated to so-called “classic” practice have a much lower camber value than those dedicated to so-called “skating” practice.
  • the high camber height of a skating ski makes it unusable for the practice of classic cross-country skiing because the braking means will remain too high in relation to the snow and their efficiency will be low.
  • an adequate braking device for a cross-country ski, or for a ski touring involves determining and fixing a certain number of criteria.
  • One of these criteria is the length, and to a lesser extent the width, of the braking device. Indeed, as the function of the latter is to increase friction, the greater its surface area, the greater the braking action will be.
  • the braking device is too long, it remains in contact with the snow even when the ski is in the sliding phase, despite the camber raising which takes place as soon as the skier does not. is more fully in support. And then, the braking device interferes with the sliding phase and consequently reduces the performance of the ski and the skier.
  • the braking devices in particular those constituted by a skin, must, in order to have satisfactory anti-kickback efficiency, a length corresponding to approximately 20% of the total length of the ski and in any event greater than 19% of this length.
  • solutions of the prior art only offer unsatisfactory responses to the implementation of a ski braking device which resolves the difficult compromise between good efficiency of the anti-rollback function, towards the rear, and the minimization of the hindrance to the forward advance during the gliding phase.
  • the solutions of the prior art do not allow the design of cross-country skis which can be used both for conventional practice and for skating practice.
  • the objective of the invention is therefore to provide a braking device which improves the performance of the anti-recoil function during the stance phase, thus preventing the ski from sliding backwards and reducing the effect of hindrance. the advance of the ski during the gliding phase.
  • a braking device for a ski comprising a first layer equipped with means for increasing friction, as well as a resilient or deformable layer, the unconstrained thickness of which is between 1 and 10 mm.
  • the braking device makes it possible to improve the efficiency of the means which increase the friction during the recoil phases because they are allowed to deform in reaction to the sliding terrain.
  • the braking device makes it possible to reduce their length and / or area. Consequently, it is not only the weight of the braking means that can be reduced, but also the negative effect they have during sliding phases.
  • this improved efficiency of the braking means has an additional advantage over the design of the skis provided for cross-country skiing in its conventional practice. It becomes possible to use, for this practice, skis which have a camber value greater than that currently used. In certain cases even, it is possible to envisage using a ski, initially designed for “skating” practice, for “classic” practice, insofar as it is associated with a braking device according to the invention.
  • the figure 1 shows a bottom view of a ski 1 equipped with a braking device 2 according to the invention.
  • This is a cross-country ski designed for so-called “classic” practice, also called “alternative pitch technique”.
  • the total length L1 of which is for example between 170 cm and 210 cm (adult ski)
  • the braking device 2 is placed under the ski.
  • the latter only occupies the central part of the ski.
  • the sliding surface 11 of the ski over a length L2 which corresponds to approximately 16% of the length of the ski.
  • the increased efficiency of the braking devices according to the invention to ensure anti-kickback allows a reduction in the length of the latter compared to the lengths of the devices of the prior art.
  • the figure 2 shows ski 1 of the figure 1 in longitudinal section AA.
  • it comprises a gliding sole 11 made from a layer of a material having good gliding properties on snow.
  • the upper surface 12 of the ski is, for its part, constituted by a protective film 12 which can be decorated.
  • Between the protective film 12 and the gliding sole 11 are interposed all the different components which, together, constitute a ski. These components include in particular upper and lower reinforcements, an intermediate core and possibly side edges.
  • the ski 1 is also characterized by the fact that braking means can be attached to the gliding sole.
  • these braking means are removably fixed in order to replace them, move them or else, as we will see later in the description, in order to be able to use the ski, without the braking means.
  • a cavity 13 is formed in the central portion of the gliding sole 11 in order to receive, at least partially, the braking means.
  • the cavity 13 has a contour of complementary shape to the outer contour of the braking means 2 so that the latter come to be housed precisely in the cavity 13.
  • a shoe 3 is also drawn on the figure 2 in order to show the relative positioning of the braking means 2 with respect to the skier's foot.
  • the braking means are more or less centered on the front portion 31 of the boot, itself placed at the level of the articulation zone of the ski binding (not shown).
  • the figure 3 shows a cross section of the ski of the figure 1 according to plan BB.
  • the braking means 2 which comprise a first layer 21 equipped with means for increasing the friction and a second layer 22 comprising a resilient material, are partially inserted into the cavity 13.
  • the second resilient layer 22 is housed in the cavity, while the first layer 21 protrudes and projects out of the cavity.
  • the resilient layer is intended to compress vertically. It has a stress-free thickness of between 1 and 10 mm and has a thickness under a stress of 1.4 kg / m 2 of between 0.5 and 3 mm. It can be produced in a thermoplastic foam with a density of between 10 and 60 kg / m 3 . Foams are preferably used whose compressive force is between 10 and 80 kPa.
  • the figure 4 shows the operation of the ski 1 equipped with braking means according to the invention.
  • the ski is placed on track 4.
  • track 4 Although particular care is taken in preparing cross-country ski tracks, the surface of the latter is rarely strictly flat. There may in particular be many protuberances 41 more or less wide and / or long and oriented or not in the direction of travel of the skier. The presence of these breaks in the flatness of the track has negative effects on the capacity of the braking means 2 to remain in contact with the track as much as possible in order to ensure their anti-rollback function. This is particularly true for the devices of the prior art.
  • the braking means 2 according to the invention cancel out these effects thanks to the presence of the resilient layer 22.
  • the resilient layer 22 which can compress locally with regard to the breaks in the flatness of the track ensures that the first layer 21 which carries the means for increasing the friction remain always and everywhere in contact with the track.
  • the anti-recoil forces are improved, even if the length L2 of the braking means is less than that of the means usually used in the prior art.
  • a skin braking means which has a length of at least 20% of the total length of the ski.
  • the figure 5 shows in section the braking means 2 according to the first embodiment of the invention.
  • a first adhesive film 23 is interposed between the first layer 21 and the resilient layer 22. Its function is to hold together the two main components of the braking means.
  • a second adhesive film 24 is placed on the resilient layer 22. Its function is to ensure the fixing of the braking means to the ski.
  • the first layer 21 is in the first embodiment made up of a complex called “sealskin”.
  • This is a base 211 from which project a multitude of wires 212 which are all oriented in the same direction, which direction forming an angle of between 10 ° and 80 ° with the direction perpendicular to the plane of the sliding surface of the ski.
  • the braking means are fixed under the ski in such a way that the direction of inclination of the wires is opposite to the direction of advance A of the ski.
  • the wires will have a tendency to flatten themselves substantially horizontally along the base 211. In doing so, they generate little friction and do not interfere with the sliding of the ski.
  • the wires maintain, or even accentuate, their protruding position and therefore generate a significant frictional force. This is the anti-recoil function of the braking means.
  • the resilient layer must be such as to allow deformation of the braking means with an amplitude guaranteeing good adaptability of the latter to the imperfections of the terrain.
  • the resilient layer 22 has a thickness between 1 and 10 mm, and preferably between 2 and 8 mm.
  • it is important that the resilient layer is not too soft or too firm. This is why, preference will be given to materials whose compressive force at 25% is between 10 and 80 kPa.
  • Different types of foam can be used to make the resilient layer. For example, Polyurethane, Polyethylene, EVA, PLA (Polylactic Acid) foams, etc.
  • foams for sealing reasons, we can select closed-cell foams, open-cell foams with a skin effect or any other foam sealed.
  • a material of foam type for the resilient layer is not limiting. Indeed, it can, if necessary, be replaced by a deformable part, which is for example obtained by plastic injection or by 3D printing, or by a 3D textile, a gel pouch or a bladder filled with water. air or any other gaseous element.
  • the resilient layer has a thickness of about 3 mm, a density of between 28 and 33 kg / m3 and a compressive force of 30 kPa.
  • the figure 6 shows in section the braking means 2 'according to a first variant of the first embodiment.
  • the resilient layer 22 ' is made of a material which, besides having mechanical characteristics similar to that of the material of the resilient layer described above, also has the ability to bond to the first layer 21 without it being necessary to use additional bonding means.
  • the resilient layer 22 ′ can be cast or injected into a mold in which the first layer 21 will have been previously placed.
  • the resilient layer 22 ′ is then overmolded or over-injected on the first layer 21.
  • the figure 7a shows a resilient layer 22 "according to a second variant embodiment of the invention. Only the resilient layer 22" is shown here.
  • the latter is in the form of a deformable plastic part which comprises a casing upper 221 "intended to be fixed to the lower surface of the ski, for example by means of an adhesive film.
  • the resilient layer 22" also comprises a lower envelope 222 "on which is fixed the first layer of the braking means.
  • the upper envelope 221 “and the lower envelope 222" are connected by a multitude of partitions 223 "oriented in the direction perpendicular to the longitudinal axis of the ski A. These partitions 223" are preferably substantially parallel to each other. others and preferably all form the same angle ⁇ with the horizontal plane.
  • the angle ⁇ is acute with respect to the direction, M, corresponding to the advance of the ski in order to allow deformation of the layer resilient 22 ".
  • the upper 221 “and lower 222" envelopes associated with the partitions 223 "constitute a succession of cylinders whose straight sections are parallelograms.
  • the partitions 223 When the lower envelope 223" is subjected, via the first layer of the braking means, with an effort, it can easily be deformed because the partitions 223 "have the possibility of lying down, that is to say of seeing, locally, their angle ⁇ , decrease. This is what is visible at the figure 7b .
  • the plastic material chosen to make the resilient layer 22 ' is a material which ensures that the deformation of the lower shell 222 "and the partitions 223" is not permanent. Thus, as soon as there is no more applied force, the resilient layer 22 "takes the shape of the figure 7a .
  • the resilient layer 22 "could be produced by 3D printing, by injection or else equivalent means everywhere.
  • first embodiment is characterized by alternative configurations of the first layer 21 or of the resilient layer 22.
  • the “velor” type sealskin can be replaced by a layer of rubber. plastic material shaped so as to form protruding protuberances which form a mat of scales, as shown in the document EP 2976138 .
  • Another variant consists in that the first layer 21 is made of the same material as that with which the gliding sole 11 is made and that the latter is waxed with an anti-recoil wax.
  • the resilient layer could be in the form of a flexible blade.
  • FIGS 8 , 9 and 10 show a second embodiment of the invention which differs from the first embodiment by the profile of the cavity 13 'which is formed in the ski 1 to receive the braking means 2.
  • FIG 8 which is a longitudinal section and at figures 9 and 10 , respectively, cross sections C and D, the bottom of the cavity 13 'is convex both in the longitudinal direction and in the transverse direction.
  • the braking means 2 are not described in detail for this embodiment because they can take one or the other of the two variants described for the first embodiment.
  • the longitudinal convexity compensates for the camber of the ski. Indeed, although for reasons of simplicity, the skis are shown flat in the various figures, in the free state they have a camber which has the effect of slightly raising the central portion. Consequently, the longitudinal convexity of the bottom of the cavity 13 'allows an accentuated prominence of the central section of the braking means 2.
  • the longitudinal and transverse convexity of the bottom of the cavity 13 ′ minimize the threshold effects created on the periphery of the cavity by the prominence of the braking means 2.
  • the lateral edges of the braking means 2 are better protected inside the cavity 13 ', which is deeper on its periphery.
  • the figure 11 shows a third embodiment of the invention in which the braking means 2 "have a variable profile in the longitudinal direction.
  • they comprise several sections: a front portion 25, a central portion 26 and a rear portion 27.
  • a resilient layer 22 is interposed between the first layer 21 and the ski.
  • the figure 12 shows a fourth embodiment of the invention.
  • This is a ski 1 intended for cross-country skiing and can be used both for classic practice and for skating practice.
  • the lower surface of the ski does not have a cavity designed to receive the braking means 2 '".
  • the sole of the ski may have a slight depression 15 in which the front portion of the braking means 2'"can be accommodated.
  • the figure 13 shows a bottom view of a ski equipped with a braking device according to a fifth embodiment of the invention.
  • the ski 1 ' is a ski for the practice of alpine ski touring.
  • the user applies braking means 2 "" over the entire length of the gliding sole.
  • the braking means 2 "" can be produced in accordance with one or the other of the braking means described or mentioned in the previous embodiments.
  • the figure 14 shows in longitudinal section the ski according to the first embodiment of the invention when it is not loaded, that is to say when it is possible to measure the camber C.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Braking Arrangements (AREA)
EP20213870.7A 2019-12-24 2020-12-14 Gleitbrett mit unidirektionalem rückhaltesystem Pending EP3842105A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1915532A FR3105009B1 (fr) 2019-12-24 2019-12-24 Planche de glisse équipée d’un dispositif de freinage

Publications (1)

Publication Number Publication Date
EP3842105A1 true EP3842105A1 (de) 2021-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20213870.7A Pending EP3842105A1 (de) 2019-12-24 2020-12-14 Gleitbrett mit unidirektionalem rückhaltesystem

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FR (1) FR3105009B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595215A (en) * 1982-02-19 1986-06-17 Karhu-Titan Oy Coating material and coating for a ski, for variable snow conditions, and method of manufacture of same
EP0294299A1 (de) * 1987-05-27 1988-12-07 Skis Rossignol S.A. Abfahrtski und Verfahren zu seiner Herstellung
US7543839B2 (en) 2003-01-24 2009-06-09 Erik Hartmann System for skis
EP2452729A1 (de) * 2010-11-16 2012-05-16 ATOMIC Austria GmbH Langlaufschi mit wenigstens einem Mittel zur Rückgleithemmung
EP2976138A1 (de) 2013-03-22 2016-01-27 Fischer Sports GmbH Aufstiegshilfe, ski und verfahren zur herstellung einer aufstiegshilfe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595215A (en) * 1982-02-19 1986-06-17 Karhu-Titan Oy Coating material and coating for a ski, for variable snow conditions, and method of manufacture of same
EP0294299A1 (de) * 1987-05-27 1988-12-07 Skis Rossignol S.A. Abfahrtski und Verfahren zu seiner Herstellung
US7543839B2 (en) 2003-01-24 2009-06-09 Erik Hartmann System for skis
EP2452729A1 (de) * 2010-11-16 2012-05-16 ATOMIC Austria GmbH Langlaufschi mit wenigstens einem Mittel zur Rückgleithemmung
EP2976138A1 (de) 2013-03-22 2016-01-27 Fischer Sports GmbH Aufstiegshilfe, ski und verfahren zur herstellung einer aufstiegshilfe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Product Information ETHAFOAM M1 polyethylene foam", 21 June 2015 (2015-06-21), XP055729691, Retrieved from the Internet <URL:http://www.qualityfoam.com/docs/ethafoam-m1.pdf> [retrieved on 20200910] *

Also Published As

Publication number Publication date
FR3105009B1 (fr) 2023-09-08
FR3105009A1 (fr) 2021-06-25

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