Sliding board, in particular ski

A sliding board, in particular a ski, comprising a front part, a middle part and a rear part with a contact surface comprising a running surface and metal edges bordering it. In accordance with the present disclosure, the contact surface of the non-loaded sliding board has a curvature development which, starting from a central contact line in the middle part which has a horizontal tangent, in each case has a positive curvature without turning points toward the front part and rear part.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to German Patent Application No. 10 2010 031 838.8, entitled “Sliding Board, in Particular Ski”, filed Jul. 22, 2010, which is hereby incorporated by reference in its entirety for all purposes.

TECHNICAL FIELD

The present disclosure relates to a sliding board, in particular to a ski, comprising a front part, a middle part and a rear part with a contact surface comprising a running surface and metal edges bordering the running surface.

BACKGROUND AND SUMMARY

A sliding board is here to be understood as a snow sliding board which can be designed in the form of conventional skis, monoskis or of a snowboard.

The typical structure of a traditional sliding board results, for example, from DE 21 2006 000 050 U1. In addition to the material parameters and the thickness development, in particular the design of the running surface in a plan view and in a side view is relevant to the handling of the sliding board. In their current constructional shape, sliding boards usually have a waist which results in the effectively traveled radius in combination with the deflection of the ski which occurs. The skis have a concave turned-up front in the side view which form the tips in the front region. It is adjoined by a convex middle region and this in turn by a concave turned-up end. The middle region or the center part has an upwardly inclined convex curvature which mergers toward the ends into the concave negative curvature so that two turning points are formed here. The non-loaded ski, which lies flat on the ground, is thus bounded in its contact surface, that is the contact region, by a rear and front contact line on the lower side of the ski toward the snow. The preload is defined as the curve development between the contact lines with the ski lying flat on a planar base.

During carving, when the sliding board is guided through the curve set onto its edge, it deforms elastically in the middle region as a consequence of the loads which occur so that the originally concave curvature temporarily becomes a convex curvature. As a superimposition of the deformation condition adopted as a consequence of the load, of the lateral waist and the edge tilt angle (that is the angle between the sliding surface and the subsurface for the case that the sliding board is set onto its edge), the side edge lying on the subsurface describes a substantially circular arc which in the ideal case corresponds to the turn to be made.

The sliding board influences the control behavior and the handling of the sliding board substantially, independently of the waist and of the mechanical properties of the ski contact region both in its length and in its preload height.

The aforesaid curvature development is also already described in DE 299 20 650 U1. Specifically the tip and tail regions of the sliding board are furthermore defined.

A sliding board is known from DE 20 2007 018 908 U1 whose front contact region is described having a tip length of more than 0.5 m.

Finally, the interaction between the waist and the preload development results from EP 2 082 787 A.

Skis are also already known from the beginnings of skiing which do not yet have the aforesaid shape. The wooden boards manufactured under the name “Fasstauben” in German (“barrel staves”) are, however, not comparable in the waist and in the structure with modern skis.

It is the object of the present disclosure to improve the control and the handling of a sliding board, in particular of a ski, by optimization of the contact curve so that a lower turn triggering moment is required to trigger a turn and so that an improved sliding and floating of the ski on snow is made possible.

In accordance with the present disclosure, the aforesaid object is achieved by a contact surface of a sliding board which comprises a front part, a middle part and a rear part. The contact surface has a curvature development in the non-loaded state which, starting from a central contact line in the middle part which has a horizontal tangent, has a positive curvature without turning points in each case toward the front part and rear part. An accurate positive curvature line of the lower contact surface of the sliding board is therefore hereby achieved. The contact lines known from the prior art are thereby displaced to form a single central contact line in the binding mounting region. The development can be described by a so-called constant spline curve of different curves without a turning point having a horizontal tangent in the region of the central contact line.

The specific curve development of the sliding board in use results from the stiffness behavior, the waist and other construction details of the ski.

An easier turnability of the sliding board can be achieved by this construction, particularly with difficult piste conditions. A higher guidance stability results with a more solid central construction even if the sliding board is only slightly set on edge.

It is particularly advantageous that the sliding board does not have to be deflected to achieve the lateral contact of the edges in the state set on edge. A smaller application of force hereby results during skiing or snowboarding. Due to the smaller application of force, a neutral position is possible which in turn results in increased safety during skiing or snowboarding. A better sliding and floating of the sliding board is possible by an overall smaller snow resistance.

Preferred embodiments of the present disclosure result from the subordinate claims dependent on the main claim.

The sliding bed is accordingly advantageously laterally waisted. The narrowest point of the sliding board amounts to at least 0.07 m at the middle part. The lateral curve of the waist is preferably composed of different radii. These radii advantageously amount to between 10 and 30 m.

It is particularly advantageous to form the upper side of the sliding board disposed opposite the contact surface as flat in the middle part and in each case to curve it at least toward the ends in the front part and rear part. An additional reinforcement which is designed as comparatively thicker hereby results in the binding mounting region. A harmonious edge pressure is in particular achieved in the binding mounting region.

Instead of a flat surface, the sliding board can, however, also have a concave or convex surface, whereby the stiffness behavior can be set directly.

Finally, the central contact line is arranged in a region which extends 0.3 m before and after the binding mounting point on the surface.

Further features, details and advantages of the present disclosure result from the following description of a preferred embodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure directed to the sliding board will be explained in more detail in the following with reference to an Alpine ski. These explanations apply in the same manner to other types of ski, for example monoskis, but also to snowboards.

The cross-section of a ski10having the basic ski components is shown inFIG. 1. The ski10has a substructure in which a running surface12is bounded by lateral metal edges, for example steel edges14. A reinforcement16is formed in a known manner toward the interior of the ski and adjacent to the running surface12. The surface18comprising the running surface12and the lower side of the steel edges14represents the contact surface to the snow. The upper part of the ski10is substantially formed by a surface20and a top chord reinforcement22. The surface disposed opposite the contact surface18and arranged at the upper side of the ski10is called the upper surface24. The intermediate space between the substructure and the upper part is filled by means of a core material26which is laterally bordered by side supports28in the embodiment shown here

InFIG. 2, the plan view is shown which comprises a middle part30, a front part32and a rear part34. As can be seen fromFIG. 2, the ski is designed with a waist. The waist has its narrowest point bm in the middle part30. The widest point in the rear ski part34is marked by bh and the widest point in the front ski part32is marked by bv. The waist curve can be formed from different circle segments such as is shown inFIG. 2with the circle segments having the radii R1and R2. The waist can, however, also be manufactured from any desired radii. The use of a single radius would also be possible. InFIG. 2the so-called binding mounting point is furthermore drawn as BMP which defines the central binding mounting position. This central binding mounting position corresponds to a usual marking at the sole of a shoe.

InFIG. 3, the curvature development of a conventional ski10′ can be recognized from the longitudinal section. A concave turned-up tip is here produced at the front part32′ which is adjoined by a convex middle part30′ and in turn a concave rear part34′. Two turning points are thus formed in the curve development of the side view which form the front contact line kpv and the rear contact line kph. These contact lines kpv in the front part and kph in the rear part bound the contact surface of the total ski. The maximum preload is designated by hv inFIG. 3. The respective ski thickness, which is also responsible for the stiffness of the ski, is produced from the spacing between the contact surface18and the surface24′. InFIG. 3, components are labeled with similar numbering as elsewhere, but with a prime.

The contact lines kpv and kph are also drawn in chain-dotted lines inFIG. 2. The preload curve is formed between these contact points with a flat ski lying freely on the ground. Said preload curve is the largest in the middle region between the contact lines KPV and KPH as is shown inFIG. 3by specification of the maximum preload HV.

The structure of the ski10in accordance with the present disclosure results fromFIG. 4. The contact surface18of the non-loaded ski10has a curvature development which, starting from a central contact line KL in the middle part, which has a horizontal tangent, in each case has a positive curvature without turning points toward the front part32and rear part34. A positive preload development is hereby represented, so-to-say. The contact surface18simultaneously forms the preload line19and represents a constant spline curve comprising different curves without a turning point, with the central contact line KL being arranged in the middle part. The preload curve19is already clearly raised from the support in the front part32and in the rear part34of the ski10.

As becomes clear inFIG. 4, the upper surface24is made flat in the middle part, whereas it curves upwardly toward the front part32and the rear part34. The core26in the middle part is hereby made thicker than the front part32or the rear part34. In this respect, the stiffness of the ski can be varied over its length. The ski advantageously has at least a flat middle part of 1 m length with a minimum total length of 1.5 m.

The effect of the different preload of the ski in accordance with the prior art, as is shown inFIG. 3, and the ski in accordance with the present disclosure, as is shown inFIG. 4, can be seen from the diagrams 5 and 6, respectively, in which the edge pressure distribution with the ski set on edge is shown.

In this respect,FIG. 5represents the corresponding edge pressure distribution KD, drawn as a diagram, of a conventional ski which is loaded by a force F. InFIG. 6, in contrast, the edge pressure distribution KD of a ski in accordance with the present disclosure loaded by a force F is shown.

If a conventional ski is loaded in accordance withFIG. 3in the binding region by a force F, the edge pressure development in accordance withFIG. 5is produced. In the central load region, that is in the region of the middle part30, a pronounced maximum40of the edge pressure distribution is adopted with an applied force11. Maxima42and44respectively are, however, also adopted in the contact regions kpv and kph in the front part32and rear part34respectively.

FromFIG. 6, the edge pressure distribution is shown in the ski in accordance with the present disclosure, with here a clear maximum40being formed in the middle region on application of a force F, said maximum leveling out continuously toward the ends32and34without any other local maxima or minima (besides the end points).