Land vehicles – Skates – Runner type
Patent
1996-08-06
1999-03-02
Poon, Peter M.
Land vehicles
Skates
Runner type
280608, A63C 504
Patent
active
058760563
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an Alpine pair ski with a front section including an upturned tip, a rear section including an end portion, and a main section with a sole which comprises, with reference to a plane of the sole with the ski's camber reduced to zero e.g. by applying a load to the ski, a flat first sliding surface which extends on both sides of the ski's central longitudinal axis Y at least to the front and rear sections respectively, and where the ski's lateral surfaces are provided with an approximately continuous concave sidecut between a first transition line A-A' defining the transition from the main section to the front section and a second transition line E-E' defining the transition from the main section to the rear section of the ski, the course of a lower lateral edge between the transition lines A-A' and E-E' approximating a continuous curve with a radius of curvature in any arbitrary point between the first and second transition line of 80 m or less.
In NO-PS 172 170 there is disclosed an Alpine pair ski which on a maximum 20 cm long front section of the main section has lateral surfaces whose lower edges diverge so greatly upwards in relation to the sliding surface and outwards sideways in relation to the ski's longitudinal axis that at the transition between the main section and the tip the ski has a width which is 15-70% greater than the width at the transition between this front section and the rest of the main section and where the lower edge of each lateral surface at the transition between the main section and the tip is located at a vertical distance above the plane of the sliding surface on the greater part of the main section, this vertical distance being at least 10% of the increase in width from the transition between the said front section and the main section to the transition between the main section and the tip.
The object of this known ski was to make it possible to turn with the least possible loss of kinetic energy, since the ski does not cut too deeply into the snow surface but nevertheless permits a good grip to be obtained when skidding.
Recent developments in the various branches of Alpine skiing, however, have involved not only an increase in speed, but also a considerable intensification of the demands on turning technique. In general the branches of Alpine skiing have become more extreme and this places increasing demands on the design of the skis. The above-mentioned known ski has an extreme outward curve in a front, 20 cm long section, this outward curve being out of proportion with the rest of the ski's outward curve. The extreme outward curve will make such a ski unstable during high speed and lead to problems with vibration. In addition the prior art ski will also lack a clean cutting edge, which means that the track which the front part of the ski carves in the snow will not be utilized by the rear sections of the ski.
The object of the present invention is therefore to provide a pair of Alpine skis which avoid the above-mentioned and other disadvantages and thus also make it possible to perform fairly tight turns at high speed without the ski edging or throwing up snow.
These objects are obtained according to the invention with a pair of Alpine skis which are characterized in that the the sole on both sides of the first sliding surface comprises additional sliding surfaces which extend upwards from the edge of the first sliding surface to the lower lateral edges of the ski with an uplift whose value at a point on the lower lateral edge of the ski is given by the length of the perpendicular from this point to said plane of the sole, the additional sliding surfaces extending in the longitudinal direction of the ski at least from the first and second transition lines A-A' and E-E' respectively towards a transversal line C-C', substantially perpendicular to the central longitudinal axis Y behind the middle of the ski and in that section of the ski where the binding is attached, the width of the ski at the line C-C' being equal to the smallest width of the ski be
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Hi-Turn AS
Lipka Pamela J.
Poon Peter M.
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