Land vehicles – Skates – Runner type
Patent
1988-10-05
1991-11-12
Mitchell, David M.
Land vehicles
Skates
Runner type
280609, 280615, 280636, A63C 504
Patent
active
050642146
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ski for cross-country skiing comprising a longitudinal rib projecting with respect to its top face.
2. Discussion of Background Information
Cross-country skis are already known which comprise a longitudinal rib on their top face. This longitudinal rib generally presents a trapezoidal cross section, in other words it is defined by a horizontal upper face and two inclined lateral faces and this rib of trapezoidal cross section joins the lower part of the ski which presents a rectangular cross section, of small height, of which the small sides constitute the edges of the ski. Due to the reduced height of these edges, such a cross-country ski slides more easily over the snow. Furthermore, the upper longitudinal rib contributes to the lateral guiding of the shoe mounted on the cross-country ski which is adapted to that end, due to the provision, in the sole, of a groove presenting in cross section a shape complementary of that of the rib of the ski.
SUMMARY OF THE INVENTION
The present invention relates to improvements in such a cross-country ski for the purpose of easily adapting its rigidity or its elastic response and of improving its technique, without notably increasing its weight.
To that end, this cross-country ski, comprising a longitudinal rib in its top part, is characterized in that it comprises, on either side of the longitudinal guiding rib and at least in the area where a shoe bears on the ski, an auxiliary separate profile fixed to the side face of the longitudinal guiding rib and lower than said rib, the separate auxiliary profile presenting a horizontal top surface on which bears the shoe sole.
The separate auxiliary profiles make it possible, due to a judicious choice of their material and shape, easily to modify the characteristics of a cross-country ski with longitudinal guiding rib, particularly concerning its suppleness and its response to stresses.
BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments of the present invention will be described hereinafter by way of non-limiting examples, with reference to the accompanying drawing, in which:
FIG. 1 is a partial view in perspective of a cross-country ski with longitudinal guiding rib on each side of which is fixed a separate auxiliary profile.
FIG. 2 is a view in vertical and transverse section, on a larger scale, made along line II--II of FIG. 1.
FIGS. 3 and 4 are views in vertical and transverse section of a cross-country ski of which the longitudinal guiding rib is flanked, on either side, by a separate elastic auxiliary profile.
FIGS. 5 to 8 are views in vertical and transverse section of various variant embodiments.
FIGS. 9 to 12 are schematic views in elevation illustrating the effect of elastic return ensured by each separate auxiliary profile.
FIG. 13 is a schematic view in elevation illustrating a cross-country ski in which the separate auxiliary profile extends solely under the ski shoe.
FIG. 14 is a schematic view in elevation of a cross-country ski in which the separate auxiliary profile extends virtually over the whole length of the ski.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 and 2 show a cross-country ski 1 which presents, in its top part, a longitudinal guiding rib 2 of trapezoidal cross section. However, this trapezoidal cross section is not limiting and it may present any other appropriate form, particularly polygonal or curved. In the embodiment shown in FIGS. 1 and 2, the cross section of the rib 2 is constituted by the superposition of two elementary sections in the form of isosceles trapezoid. The guiding rib 2 thus presents a horizontal top face 2a constituting the small base of the upper trapezoidal section, which is extended by two inclined lateral faces 2b, 2c. This upper trapezoidal section joins a lower trapezoidal section of which the upper small base corresponds to the large base of the upper trapezoidal section. The lower trapezoidal section comprises two lower inclined lateral walls 2d, 2e whic
REFERENCES:
patent: 4094528 (1978-06-01), Cluzel
patent: 4353576 (1982-10-01), Salomon
patent: 4714267 (1987-12-01), Abondance et al.
patent: 4789177 (1988-12-01), Graillat
patent: 4911462 (1990-03-01), Diard et al.
Diard Jean-Luc
Grandjacques Philippe
Recher Gilles
Mitchell David M.
Salomon S.A.
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