Land vehicles – Skates – Runner type
Patent
1994-10-18
1996-11-19
Camby, Richard M.
Land vehicles
Skates
Runner type
A63C 500
Patent
active
055754953
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cross-country ski, and more specifically to a cross-country ski intended to be used according to the technique termed "skating".
Essentially two techniques are currently known for the practice of cross-country skiing, each linked with the technique of forward movement.
The first, classical, technique, known by the term "alternating steps", consists of thrusting each ski alternately forward in two parallel tracks made for this purpose on the run. The ski used for the practice of this technique has a central part which is arched, in particular at the support face, including a region called a "wax chamber" made at the support face. This region is intended to receive wax which has properties of adhesion to snow. As a result of the thrust exerted by the skier, the chamber comes into contact with the snow and causes the necessary holding to advance the ski. In view of the fact that the skis are guided in parallel lines made in the snow and in view of the large range of movement of the ski inherent with the actual alternate-step technique, the skis are provided with a relatively high tip which is intended to prevent any risk of the ski sticking into the snow.
There are also types of skis in which the wax chamber is replaced with sole scales, which have asperities pointing backward that prevent backward movement of the ski.
The second technique, which has emerged recently and is more sports-oriented, is called "skating". According to this technique, the skier moves by pointing his skis outward with respect to the direction of forward movement, the propulsion being provided by the alternate exertion of transverse thrusts by the skier on one of his skis. This technique is essentially broken down into four successive phases, respectively a first phase in which the ski is pressing on the outside, followed by a flat gliding phase, followed in turn by a phase of thrusting on the inner face, and finally by a so-called "flight" phase, during which the ski leaves the snow until the pressure of the following movement.
In such a ski, the wax chamber or any other system capable of providing adhesion, even point adhesion, is no longer necessary since the push is no longer exerted in the longitudinal direction but rather by means of successive and alternate transverse pressure.
In fact, skating skis require high characteristics of strength in lateral flexion and in torsion, in view of the stresses to which they are subjected. Moreover, with a ski which is too flexible, there is a risk that it will slip as a result of the pressure generated by the skier. The other fundamental element for such a ski concerns its balance with respect to the foot of the skier, in order not to hamper the flight phase which immediately follows the thrust. level, they nevertheless have certain drawbacks, They may have a certain lack of maneuverability, especially during the flight phase. Furthermore, they may have relative bulkiness, caused by the principle of divergent foward movement, which may lead to crossing tips in narrow runs, or with respect to obstacles, rocks, trees, etc. lying along the run. Further still, some skis may be difficult to bring back during the flight phase since they generate wind resistance which is less and less negligible as the ski becomes longer, which, in turn detrimentally affect the "efficiency" and effectiveness of this technique. Finally, the so-called skating technique is relatively difficult to learn.
The object of the invention is to provide a cross-country ski for use according to the skating technique which overcomes all these drawbacks.
In order to achieve these results, the invention provides a cross-country ski which is both less bulky and has the appropriate technical characteristics.
SUMMARY OF THE INVENTION
The cross-country ski according to the invention, particularly intended for the technique termed "skating", is characterized in that its bearing length, corresponding to the developed length of the sole separating the two respective front and rear contact lines of the ski i
Dusser Bruno
Locatelli Dominique
Camby Richard M.
Skis Rossignol SA
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