EP1100598B1 - Cross-country ski - Google Patents

Abstract

To be able to utilize the kinetic energy which is due to the travelling speed of or the push-off energy introduced by the skier for a longer period than was possible with known skis, the invention provides for at least one of the lateral surfaces of the ski, notably the cross-country ski (SK), to be convex or parallel in the central area and concave in the front and/or rear area.

Description

The invention relates to a pair of skis for cross-country skiing according to the introductory part of claim 1.

The invention is particularly aimed at training the Pair of skis for skating or skating technology, whereby through a special design of the side shape or waist the skier should be given the opportunity to run while of running by running speed or by the runner to use the energy of the momentum caused by the pushing energy for a longer time than was possible with the usual skis.

There are two phases in skating technique, namely the Repulsion phase and the sliding phase.

Pushing off on skating skis is done by edging the ski SK over the covering edge by an edging angle β (between preferably 5 ° and 45 °) relative to the snow surface SCH, like it is schematically illustrated in Fig.1, and a simultaneous Transverse positions of the ski according to Fig. 2 at a certain deflection angle α, e.g. between 10 ° and 80 °, depending on the slope of the slope to the running direction, as well as by introducing a repulsion impulse (dependent of the running technique and the body weight of the runner).

For the sliding phase, it is favorable if the sliding direction of the Skis match the run direction of the runner as shown in 3 is shown schematically.

Here, the direction of rotation is indicated in the drawing by arrow A.

For optimal energy utilization, it is beneficial if the Sliding phase, i.e. the phase in which the ski is running follows, lasts as long as possible, and the rejection phase, that is Phase in which the skis are edged and turned must be kept as short as possible, as this is schematic is shown in Fig.4. In Fig.4 are the lines GL and GR respective sliding phase of the left (GL) or right (GR) ski and with the subsequent curve AL or AR the repulsion phase of the left (AL) or right (AR) ski indicated.

To the movement sequence described and illustrated above would be possible with skis with different side shape geometries required. For straight-line movement (sliding phase) or driving straight would be skis with straight or concave Need page shapes according to Fig. 5 or Fig. 6 for the on the other hand, running movement of the skis (push-off phase) is convex Page shapes according to Fig. 7.

Known cross-country skis either have a parallel waist or a concave waist, in which the ski ends and the ski tips are wider than the center of the ski. Furthermore are particular known for the skating technique cross-country skis, the one have a convex waist, with the ski width in the middle is larger than in the front and rear area. Finally are Skis known to be a convex or in a certain area have parallel waist and are swept towards the tip are. Skis with a concave waist have one Property picture, which requires that if you bend the ski, i.e. on the edge, it follows the concave side shape, i.e. if this ski, for example, when skating on right foot is attached, it does not refer to the outside Running direction, but pulls inwards. Skis with parallel Page shape are relatively neutral, but simplify the Movement outwards compared to skis with concave Sidecut. Skis with a convex side shape automatically favor the curve towards the outside in relation to the direction of travel.

If you look at the skating or ice skating technique in increasing Terrain, so to achieve a climbing effect that the respective ski pulls outwards from the running direction to get a certain transverse position in relation to the running direction, so that the runner pushes himself off on the outer ski and into the can change another step. This technique favor convex or parallel side shapes stronger than concave side shapes that have an opposite effect. The disadvantage of convex side shapes is that as soon as the ski is turned up, automatically draws into the curve according to the waist.

To explain this behavior of skis with a convex side shape 8, in which arrow A shows the direction of skiing is indicated. Want a runner with you conventional skis with a convex side shape the distance from X to Y put back, the ski automatically pulls along the waist into a curve labeled a up to an angle from the Slope of the track is dependent, since with a larger slope the track a correspondingly larger deflection from the direction of travel must be taken away to perform a push off can. The flatter the track, the less the deflection. At the end of this deflection, the runner must have the known ski its remaining speed adversely break off so as not to deviate too far from the longitudinal direction. After the distance S traveled from the starting point X changes the runner's step on the second foot, which is in analog Way along the curve al covered the route S1.

AT 369 273 has made a ski, namely alpine ski, known with a convex part in the middle and then there is a concave part on it. This Side shape cutout is supposed to solve the task behave particularly on smooth, steep slopes improve. It is mentioned that with skis with concave Basic curve and convex superimposed curve, the highest point together with the widest part in front and the widest Place an imaginary concave side shape in the usual way Meaning gives an edge pressure distribution with a very strong pronounced pressure concentration in the area of the convex curve and achieved with very little pressure immediately before and after becomes. This is useful for alpine skis, but not for the Cross-country skating step.

A cross-country ski is also known from US Pat. No. 5,427,400 has a cavity in the central area in order to repel the movement the impulse on the ski to the wax zone on the underside of the ski to concentrate. Training is also shown where the ski has a concave waist on both sides, whereby this runs relatively flat in the central area; nonetheless the concave waist extends on each side of the ski from the shovel area to the end of the ski.

The object of the invention is through special training of Side shape or the waist of the skis the longitudinal movement of the skis stabilize so that the skis during the gliding phase pull outward less and the existing speed does not have to be canceled, but rather the momentum energy is better exploited and through conscious pressure increase and thus changing the surface pressure distribution under the ski and Concentration of weight on the middle area of the skis at the end of the sliding phase, the respective ski can be moved into the Repulsion phase is brought, whereby the runner, introduced at the same Repulsion energy, a flatter curve b or b1 (see Fig. 8) can run through and thus cover a distance W or W1 that can be bigger than the one with traditional skis distance S or S1 is covered.

To achieve this object, the invention provides a pair of skis with Features of claim 1 before; advantageous embodiments are specified in the subclaims.

It is particularly advantageous if the envelope in the blade area farther than in the heel area from the center line of the ski is removed.

Further details of the invention are described below with reference to the Fig. 9 to 11 of the accompanying drawings. From the above Figures is each in a simplified representation Top view of a ski can be seen.

9 and 9A are preferred embodiments of the side waists of a cross-country ski, the convex Parts, namely central areas convex to the center line X-X of the ski KN and the widest parts H1 and H2 on the front or rear end of ski one marked with B, indicated by dashed lines Touch envelope, as shown in Fig. 9, a straight Line, or, as indicated in Fig. 9A, a convex arc can. The envelope B leads from the tip-side edge region H1 to the heel edge area H2 and touches the apex of the convex central area KN.

Gleitphase
Da der Skatingski SK im Mittelstück während der Gleitphase (Belastung maximal Körpergewicht des Läufers) nicht vollständig auf die Schneeunterlage gedrückt wird, sind nur jene Flächen des Skis SK für die Laufrichtung des Skis SK verantwortlich, die Kontakt mit der Schneeunterlage besitzen. Die Kontaktlinien bei einer Belastung, beispielsweise durch ein halbes bis ganzes Körpergewicht, sind in Fig.10 verstärkt und mit K bezeichnet. Kombiniert man nun diese Kontaktflächen der Gleitphase mit der optimalen Seitenform der Gleitphase, so ergibt sich eine möglichst geradlinige Bewegung, welche in Fig.10 mit dem Pfeil A1 bezeichnet ist.

Abstoßphase
Bei der Abstoßphase wird der Druck auf den Ski SK erhöht und der Ski wird aufgekantet, wie in Fig.1 dargestellt ist. Dadurch wandern die Kontaktflächen K zum Ski-Mittelbereich. Durch die Anordnung der konvexen oder parallelen Seitenform im Mittelbereich wird der Ski SK nun nach außen in die Abstoßposition gebracht.
Die entsprechende, in Fig.11 verstärkt eingezeichnete Kontaktlinie bei einer Belastung durch beispielsweise das ganze Körpergewicht bis zu 1½ des Körpergewichts ist mit R1 und die Laufrichtung des Skis SK ist mit dem Pfeil A2 bezeichnet.

Maßgebend für diesen oben beschriebenen Ablauf ist das Zusammenspiel zwischen Biegesteifigkeitsverlauf, Seitenform und Aufkantwinkel des Skis.

With a ski SK of this type, the ski tip of which is designated SP in FIGS. 10 and 11, taking into account the course of the stiffness and the pressure distribution associated therewith, the use of two different directions of movement for the flat-lying ski under the outsole and for the upturned ski on the edge of the outsole ( straight and curved outwards), as follows:

glide
Since the skating ski SK is not fully pressed onto the snow pad during the gliding phase (maximum load of the skier's body weight), only those surfaces of the SK ski that are in contact with the snow pad are responsible for the direction of the SK ski. The contact lines during a load, for example by half to a full body weight, are reinforced in Fig. 10 and labeled K. Combining these contact surfaces of the sliding phase with the optimal side shape of the sliding phase results in a movement that is as straight as possible, which is indicated by the arrow A1 in FIG.

push-off phase
During the push-off phase, the pressure on the ski SK is increased and the ski is edged, as shown in Fig. 1. As a result, the contact surfaces K migrate to the central ski area. By arranging the convex or parallel side shape in the middle area, the ski SK is now brought outwards into the push-off position.
The corresponding contact line, which is shown in FIG. 11 with a load by, for example, the entire body weight up to 1½ of the body weight, is denoted by R1 and the direction of the ski SK is indicated by the arrow A2.

The decisive factor for this process described above is the interplay between the bending stiffness curve, side shape and edging angle of the ski.

Claims (6)

1. A pair of skis, in which the middle region (KN) of at least one of the two longitudinal side faces of at least one ski (SK) of the pair of skis is convex or parallel to the longitudinal axis (X-X) of the ski (SK) and at least one longitudinal side face of at least one ski (SK) of a pair of skis is designed to be concave in its front and/or rear region (K), characterised in that by designing the pair of skis as a pair of cross-country skis, the convex or parallel middle region (KN) and the widest parts (H1, H2) at the tip-side contacting edge and on the heel-side contacting edge, respectively, contact a straight-line or convex envelope (B).
2. A pair of skis according to claim 1, characterised in that the envelope (B) is a straight line which has a larger distance to the longitudinal axis (X-X) of the ski (SK) at the site of contact (H1) of the tip-side contacting edge than in the region of the vertex (K1) of the middle convex or parallel portion (KN).
3. A pair of skis according to claim 1 or 2, characterised in that the convex or parallel region (KN) merges into the concave region (K) without any edge.
4. A pair of skis according to any one of claims 1 to 3, characterised in that the convex or parallel region (KN) extends over the region of the ski binding.
5. A pair of skis according to any one of claims 1 to 4, characterised in that the convex or parallel and the concave regions (KN, K) are arranged mirror-inverted relative to the longitudinal axis (X-X) of the ski (SK).
6. A pair of skis according to any one of claims 1 to 5, characterised in that the convex or parallel and the concave regions (KN, K) on both skis (SK) of a pair of skis have the same shape.

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