Land vehicles – Skates – Runner type
Patent
1988-10-05
1990-09-18
Mitchell, David M.
Land vehicles
Skates
Runner type
280610, 280615, A63C 504
Patent
active
049573047
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ski comprising a longitudinal rib at its top part.
Skis, particularly cross-country skis, are already known which comprise a longitudinal rib on their top face. This longitudinal rib generally presents a trapezoidal transverse section, in other words, it is defined by a horizontal top face and two inclined lateral faces, and this rib of trapezoidal cross section joins the lower part of the ski which presents a rectangular transverse 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 ski slides more easily over the snow. Furthermore, in the case of a cross-country ski, the top longitudinal rib may serve in particular for laterally guiding the shoe mounted on the cross-country ski, which shoe is adapted to that end thanks to the provision, in its sole, of a groove presenting in cross section a shape complementary of that of the rib of the ski.
The present invention relates to improvements in such a ski for the purpose of improving its technical qualities, without notably increasing its weight.
To that end, this ski comprising a longitudinal rib at its top part is characterized in that the cross section of the rib is comprised, at least in the front part of the central area where the shoe sole is bearing, of the superposition of at least two upper and lower elementary sections each having the shape of a quadrilateral and interconnected by a common side forming the lower side of the upper elementary section and the upper side of the lower elementary section of which the lower side is horizontal, the lateral sides of the lower elementary section converging upwards and being more inclined, with respect to a vertical and longitudinal plane, than the lateral sides of the upper elementary section.
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 view in perspective of a cross-country ski with longitudinal rib, with illustrations of the transverse section of the ski at different points of its length.
FIGS. 2 to 20 are views in vertical and transverse section, on a larger scale, of various embodiments of the ski according to the invention.
FIG. 21 is a view in perspective of a variant embodiment of the cross-country ski.
FIG. 1 shows a cross-country ski 1 which has a transverse section with profile evolutive in the longitudinal direction and which presents, at its top part, over the greater part of its length, a longitudinal rib. The transverse section of this rib, located above the edges of the ski, is constituted, over certain parts of the length of the ski, by one sole quadrilateral, in the present case an isosceles trapezium, and, over another part of the length, by two superposed quadrilaterals, in the present case two isosceles trapeziums. More particularly, the cross-country ski 1 may be subdivided into three longitudinal areas where the longitudinal rib is formed, namely a central area A where a cross-country ski shoe (not shown) bears which is connected to the ski at its front end and of which the sole is provided with a longitudinal groove, and two front and rear longitudinal areas B and C which extend the central bearing area A respectively forwards and rearwards, and which join flat front and rear end parts, i.e. bereft of the longitudinal rib. In the front and rear areas B and C, the transverse section of the rib of the cross-country ski 1 has the shape of a single isosceles trapezium, whilst, in the central longitudinal area A, its transverse section is constituted by the superposition of two elementary sections of which each has the shape of an isosceles trapezium.
FIG. 1 shows various profiles of the cross section of the cross-country ski 1 over its length. In its front end part, the transverse section of the ski 1 has a flattened rectangular form 1a defined laterally by the two vertical edges 9, 10 of the ski and which is found all along the ski. The transverse
REFERENCES:
patent: 3762734 (1973-10-01), Vogel
patent: 4714267 (1987-12-01), Abondance et al.
Diard Jean-Luc
Grandjacques Philippe
Recher Gilles
Mitchell David M.
Salomon S.A.
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