EP0294299A1 - Downhill-ski and process for making the same - Google Patents

Downhill-ski and process for making the same Download PDF

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Publication number
EP0294299A1
EP0294299A1 EP88420168A EP88420168A EP0294299A1 EP 0294299 A1 EP0294299 A1 EP 0294299A1 EP 88420168 A EP88420168 A EP 88420168A EP 88420168 A EP88420168 A EP 88420168A EP 0294299 A1 EP0294299 A1 EP 0294299A1
Authority
EP
European Patent Office
Prior art keywords
sole
ski
thickness
layer
elastic
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
EP88420168A
Other languages
German (de)
French (fr)
Other versions
EP0294299B1 (en
Inventor
Roger Abondance
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
Priority to FR8707835 priority Critical
Priority to FR8707835A priority patent/FR2615746B1/en
Application filed by Skis Rossignol SA, Rossignol SA filed Critical Skis Rossignol SA
Publication of EP0294299A1 publication Critical patent/EP0294299A1/en
Application granted granted Critical
Publication of EP0294299B1 publication Critical patent/EP0294299B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63CSKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00Skis or snowboards
    • A63C5/06Skis or snowboards with special devices thereon, e.g. steering devices
    • A63C5/07Skis or snowboards with special devices thereon, e.g. steering devices comprising means for adjusting stiffness
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63CSKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00Skis or snowboards
    • A63C5/04Structure of the surface thereof

Abstract

1. A downhill ski comprising a sole (1) made of flexible or semi-rigid material, having a profile which is substantially constant along the entire length of the ski, and the two longitudinal edges of which are embedded in metallic flanges (6), and whose central portion is in contact via its surface facing the core (9) with a layer (7) of elastic material, characterised in that the central portion (2) of the sole has a thickness (e) less than the thickness (E) of its lateral zones (3) embedded in the lower flanges (6), and in that the layer (7) of elastic material interposed between the central portion (2) of the sole and a hard layer (8) located on the side of the core is compressed between these two elements, its thickness before compression being greater that the difference (E-e) between the two thicknesses of the sole.

Description

  • The present invention relates to a downhill ski, also called downhill or alpine ski, as well as to a method of manufacturing such a ski.
  • The lower part of a large number of currently known piste skis consists of a sole made of high density polyethylene and of very high molecular weight, which is bordered by steel edges.
  • These soles are flat and of constant thickness. They are conventionally cut into sections of constant thickness in a flat cylinder, in the form of a grinding wheel, obtained by sintering the powdered polyethylene.
  • The invention aims to improve the sliding of track skis with semi-rigid plastic sole, more particularly with polyethylene sole. It is based on the observation, made by observing children's games using either inflatable sleds or sleds made of rigid plastic, that the sliding on snow of inflatable sleds is greater than that of sleds of rigid plastic. This result is obtained by a ski whose sole, which is of constant profile over substantially the entire length of the ski, is made of a flexible or semi-rigid material, preferably of polyethylene powder, of high density, of very high molecular weight, extruded according to a particular known process, to a profiled shape such that the thickness of this sole at the level of the lower edges is significantly greater than its thickness over the remainder of the width of the ski. Furthermore, a layer of an elastic material, for example made of polyethylene foam or elastic rubber, is compressed between this thin part of the sole and a hard layer placed above. In the middle part of the ski, we thus obtain an elastic and slightly domed underside in convex shape in the absence of strong pressure on the ski, so that the sliding surface at this location is fairly close to that of an inflatable sledge. .
  • To make such a ski, a sole is first produced by extruding polyethylene which is profiled so as to have a flat base and a thickness which is, in the transverse direction, significantly higher at the edges than in the middle part. remaining. Skiing is then carried out by stacking under pressure in the mold of several layers, including this profiled sole, placed in the bottom of the mold and bordered by the two lower edges, then a layer of elastic foam, overcoming at least the sole portion of lesser thickness and having a thickness greater than the hollow formed in this sole due of this lesser median thickness, then at least one hard layer, such as a rigid reinforcing layer.
  • In any case, the invention will be well understood, and its advantages and other characteristics will emerge during the following description of a nonlimiting example of embodiment of this ski, with reference to the appended schematic drawings in which:
    • Figure 1 is a perspective view of the extruded sole, before making this ski;
    • Figure 2 is a cross section showing the production phase in the mold;
    • Figure 3 is a cross section of this ski along III-III of Figure 4;
    • Figure 4 is a side view of this ski, worn by a skier;
    • Figure 5 is a cross section of this ski along VV of Figure 4.
  • Figure 1 shows the appearance of the polyethylene strip, obtained by extrusion in a piston extruder, which is intended to constitute, after cutting to the correct length, the sole 1 of this ski.
  • This sole 1 has a profiled shape. Laterally, its thickness E is equal to the usual thickness of the soles of sliced polyethylene, chosen such that the two lateral edges of the sole closely fit under the two lower edges of the ski. This thickness is however equal to E only over an area 3 of relatively small width 1 on each side of the sole, of the order of one tenth to one fifth of the total width L of the sole: on the remaining middle part 2 of the sole, of width λ = L - 2 l, the thickness of the sole is equal to a value e much less than E. For example, e is of the order of two to four times less than E.
  • The central part 2 of the polyethylene band 1, which is bonded to the structure of the ski by means of an elastic foam support, may be, because of its relative thinness, considered to be flexible, while the two bands lateral 3, much thicker and directly attached to the ski structure, are rigid. To fix ideas, E is for example equal to 1.5 millimeters, while e is equal to 0.5 millimeters.
  • FIG. 2 shows the stacking, in a mold of which the bottom 4 and the side edges 5 are shown, of the constituent elements of this ski. First we put the sole 1 and the two lower edges 6. Then, on this sole 1 and between the edges 6, we put a layer 7 of elastic polyethylene foam, the thickness before compression is significantly greater than E - e. Next, a rigid reinforcement 8 is applied over the entire width of the ski, then the core 9 and the two lateral edges 10, and finally an upper layer 11 followed by a cover layer 12. The mold cover, not shown, is then put in place and strongly pressurized, which among other things strongly compresses the elastic layer 7.
  • After the conventional molding, demolding and finishing operations, the ski schematically takes the appearance shown in cross section in FIG. 3: the compressed foam 7 has, by inflating, pushed the thin part 2 of the sole 1 down, so that the sole 1 of the ski has a central part which has a slight downward recess d, giving it a generally convex shape (this recess was very exaggerated in FIG. 3 for the clarity of the description). The part 2 and the foam 7 being flexible and elastic, the ski therefore rests on a sort of elastic cushion in excess thickness.
  • Of course, this elastic cushion is completely flattened if you press strongly from bottom to top, for example under the boot of the skier who puts on this ski: FIGS. 4 and 5 show the state of the ski under the boot 13 of the skier , where the support is maximum. At the front 14 and at the rear 15 of the ski, the vertical support is less, so that the section of the ski takes the slightly convex shape of FIG. 3.
  • Of course, the invention is not limited to the embodiment which has just been described. In particular, a material other than polyethylene could be used both for the production of the sole and for that of the layer of elastic foam.

Claims (6)

1 - Downhill ski comprising a sole (1) of constant profile over substantially the entire length of the ski, characterized in that this sole is of flexible or semi-rigid plastic material and has a profiled shape giving it, in the vicinity of the lower edges (6), a thickness (E) significantly greater than its thickness (e) over the remainder (2) of the width of the ski, and in that a layer (7) of an elastic material is interposed and compressed between the part (2) of lesser thickness (e) of the sole (1) and a hard layer (8) placed above.
2 - Downhill ski according to claim 1, characterized in that the profiled sole (2) is made of extruded polyethylene.
3 - Downhill ski according to claim 1 or claim 2, characterized in that the elastic layer (7) is made of polyethylene foam or rubber foam.
4 - Downhill ski according to one of claims 1 to 3, characterized in that the thickness (E) of the two lateral bands (3) of the sole (1) is several times greater than that (e) of its central part (2).
5 - Downhill ski according to one of claims 1 to 4, characterized in that the thickness before compression of the elastic layer (7) is several times greater than the difference (E - e) between the two thicknesses of the sole (1).
6 - Method for producing a ski according to one of claims 1 to 5, characterized in that it consists in producing, by extrusion of polyethylene, a sole (1) which is profiled so as to have a flat base and a thickness which is, in the transverse direction, significantly higher on the edges (3) than in the middle part (2) remaining, then to manufacture the ski by stacking under pressure in the mold of several layers, including this profiled sole ( 1), placed in the bottom (4) of the mold and bordered by the two lower edges (6), then a layer (7) of elastic foam, surmounting at least the part (2) of sole of lesser thickness and having a thickness greater than the hollow (E - e) formed in this sole due to this smaller median thickness, then at least one hard layer (8), such as a rigid reinforcing layer.
EP88420168A 1987-05-27 1988-05-26 Downhill-ski and process for making the same Expired - Lifetime EP0294299B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8707835 1987-05-27
FR8707835A FR2615746B1 (en) 1987-05-27 1987-05-27 Downhill ski and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT88420168T AT57310T (en) 1987-05-27 1988-05-26 Downhill ski and method for their production.

Publications (2)

Publication Number Publication Date
EP0294299A1 true EP0294299A1 (en) 1988-12-07
EP0294299B1 EP0294299B1 (en) 1990-10-10

Family

ID=9351735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420168A Expired - Lifetime EP0294299B1 (en) 1987-05-27 1988-05-26 Downhill-ski and process for making the same

Country Status (4)

Country Link
EP (1) EP0294299B1 (en)
AT (1) AT57310T (en)
DE (1) DE3860772D1 (en)
FR (1) FR2615746B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501825A (en) * 1993-09-07 1996-03-26 Skis Rossignol Sas Process for the manufacture of a shaped ski

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR786082A (en) * 1934-02-24 1935-08-26 Ski slip plate of light metal
DE2025622A1 (en) * 1969-06-06 1970-12-10
FR2187371A1 (en) * 1972-06-08 1974-01-18 Bildner Heinz
US3790184A (en) * 1972-12-13 1974-02-05 J Bandrowski Ski construction
CH549393A (en) * 1972-03-22 1974-05-31 Meyer Urs P Ski.
DE3522563A1 (en) * 1984-07-06 1986-02-06 Tmc Corp Cross-country ski

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR786082A (en) * 1934-02-24 1935-08-26 Ski slip plate of light metal
DE2025622A1 (en) * 1969-06-06 1970-12-10
CH549393A (en) * 1972-03-22 1974-05-31 Meyer Urs P Ski.
FR2187371A1 (en) * 1972-06-08 1974-01-18 Bildner Heinz
US3790184A (en) * 1972-12-13 1974-02-05 J Bandrowski Ski construction
DE3522563A1 (en) * 1984-07-06 1986-02-06 Tmc Corp Cross-country ski

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501825A (en) * 1993-09-07 1996-03-26 Skis Rossignol Sas Process for the manufacture of a shaped ski

Also Published As

Publication number Publication date
AT57310T (en) 1990-10-15
EP0294299B1 (en) 1990-10-10
DE3860772D1 (en) 1990-11-15
FR2615746A1 (en) 1988-12-02
FR2615746B1 (en) 1990-02-16

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