EP2409741B1 - Glide board with reversed camber, so-called rocker - Google Patents

Description

The invention relates to a gliding board, in particular a ski, according to the preamble of claim 1.

Under Gleitbrett here is a snow gliding board to understand that may be in the form of conventional skis, monoski or a snowboard.

The typical structure of a traditional gliding board is exemplified by the DE 20 2006 000 050 U1 , In particular, the design of the tread in plan view and in side view is relevant for the handling behavior of the gliding board in addition to the material parameters and the course of the thickness. In current design sliding boards usually have a sidecut, which in combination with the resulting deflection of the ski results in the effectively driven radius. In the side elevation, the skis have a concave Spitzaufbiegung, which form the blade in the front area. This is followed by a convex middle region and, in turn, a concave end bend. The central region or the central part has an upwardly inclined convex curvature, which merges towards the ends into the concave negative curvature, so that two points of inflection are formed here. Thus, the unloaded flat-lying ski in its bearing surface, that is the Contact area, bounded by a rear and front contact line on the ski base towards the snow. The bias is defined as a curve between the lines of contact when lying flat ski on a flat documents.

When carving, when the sliding board is thus placed on the edge through the curve, it deforms elastically in the central region as a result of the loads occurring, so that from the originally convex curvature, temporarily becomes a concave curvature. As a superposition of the resulting as a result of the load deformation state, the lateral sidecut and the Aufkantwinkel (that is, the angle between the sliding surface and the ground in the event that the sliding board is placed on the edge) describes the resting on the ground side edge in the essentially circular path, which in the ideal case corresponds to the curve to be traveled.

Regardless of the waisting and the mechanical properties of the ski contact area, the gliding board substantially influences the control and handling characteristics of the gliding board both in terms of its length and in terms of its preload height.

Also from the DE 299 20 650 U1 already the aforementioned curvature of the sliding board is described in detail. In addition, in particular, the blade and end portions of the sliding board are defined.

From the DE 20 2007 018 908 U1 is a sliding board known whose front contact area is described with a blade length greater than 0.5 m.

Finally, it also results from the EP 2 082 787 A the interaction between the sidecut and the preload course.

Skis are already known from the origin of skiing, which do not yet have the aforementioned shape. However, the wooden boards produced under the term "barrel pigeons" are not comparable in terms of sidecut and construction with modern skis.

A generic sliding board is from the US 2008/042400 A1 known.

The object of the invention is to improve the control behavior and handling of a sliding board, in particular a ski, by optimizing the contact curve, so that a lower momentum release moment is required for the swing release and that an improved sliding and floating of the ski on snow is possible.

According to the invention, the aforementioned object is achieved by a ski having the features of claim 1.

Accordingly, the contact surface of a sliding board, which consists of a front part, middle part and rear part, in the unloaded state of the sliding board on a curvature, starting from a central contact line in the middle part, which has a horizontal tangent to the front and rear part of a positive curvature without turning points. As a result, therefore, an arcuate, positive curvature curve of the lower contact surface of the sliding board is achieved. The contact lines known from the prior art thereby shift to a single central contact line in the binding mounting area. The course can be described by a so-called continuous spline curve consisting of different curves without inflection point with a horizontal tangent in the region of the central contact line.

According to the invention, the upper surface of the sliding board opposite the contact surface is flat in the central part and in the front part and rear part in each case at least towards the ends. This results in the binding mounting area an additional gain that is made comparatively thicker. Thus, a harmonious edge pressure is achieved especially in the binding mounting area.

The concrete curve of the sliding board in use now results from the stiffness behavior, the sidecut and other constructive details of the ski. This design makes it easier to rotate the gliding board, especially in difficult piste conditions. It results in a higher leadership stability in solid center even if the sliding board is only slightly tilted.
It is particularly advantageous that the sliding board does not have to be bent in order to achieve the lateral contact of the edges in the folded-up state. This results in less effort during skiing or snowboarding. Due to the reduced effort a neutral riding position is possible, which in turn leads to increased safety when skiing or snowboarding. By a lower overall snow resistance, a better sliding and floating of the sliding board is possible,
Preferred embodiments of the invention will become apparent from the subsequent claims to the main claim.
Accordingly, the sliding board is advantageously laterally waisted. The narrowest point of the sliding board is at least 0.07 m in the middle section. The lateral curve of the sidecut is preferably composed of different radii. These radii are advantageously between 10 and 30 m.

Finally, the center line of contact is located in an area that extends 0.3 m in front of and behind the bond mounting point on the surface.

Figur 1:

einen Querschnitt durch das erfindungsgemäße Gleitbrett,

Figur 2:

eine Draufsicht auf einen Ski gemäß der vorliegenden Erfindung, die auch derjenigen gemäß dem Stand der Technik entspricht,

Figur 3:

einen Längsschnitt mit entsprechendem Krümmungsverlauf eines herkömmlichen Skis nach dem Stand der Technik,

Figur 4:

einen Längsschnitt mit entsprechendem Krümmungsverlauf für ein Gleitbrett gemäß der Erfindung,

Figur 5:

ein Diagramm der Flächendruckverteilung bzw. Kantendruckverteilung bei einem Gleitbrett nach dem Stand der Technik und

Figur 6:

ein Diagramm entsprechend Figur 5, in welchem die Flächendruckverteilung bzw. Kantendruckverteilung eines Gleitbretts nach der vorliegenden Erfindung dargestellt ist.

Further features, details and advantages of the invention will become apparent from the following description of a preferred embodiment of the invention. Show it:

FIG. 1:

a cross section through the sliding board according to the invention,

FIG. 2:

a top view of a ski according to the present invention, which also corresponds to that of the prior art,

FIG. 3:

a longitudinal section with corresponding curvature of a conventional ski according to the prior art,

FIG. 4:

a longitudinal section with a corresponding curve for a sliding board according to the invention,

FIG. 5:

a diagram of the surface pressure distribution or edge pressure distribution in a sliding board according to the prior art and

FIG. 6:

a diagram accordingly FIG. 5 in which the surface pressure distribution or edge pressure distribution of a sliding board according to the present invention is shown.

In the following, the aligned on the sliding board invention will be explained in more detail using an alpine ski. These explanations apply in the same way to other types of skis, for example monoski, but also snowboards.

In FIG. 1 is the cross section of a ski 10 shown with the essential ski components. The ski 10 has a base in which a tread 12 of lateral metal edges, preferably steel edges 14, is limited. Towards the inside of the ski, a reinforcement 16 is formed adjacent to the tread 12 in a known manner. The surface 18 consisting of the tread 12 and the underside of the steel edges 14 is the contact surface to the snow. The upper part of the ski 10 is essentially formed by a surface 20 and a top flange reinforcement 22. The contact surface 18 opposite, arranged at the top of the ski 10 surface is referred to as upper surface 24. Between the substructure and the upper part of the intermediate space is filled by means of a core material 26, which is laterally bordered by side cheeks 28 in the illustrated embodiment.

In FIG. 2 the plan view is shown, which consists of a middle part 30 a front part 32 and a rear part 34. Like from the FIG. 2 can be seen, the ski is waisted. The sidecut has its narrowest point bm in the middle part 30. With bh is the widest point in the ski rear part 34 and bv is the widest point in the ski portion 32 is designated. The waisting curve may be formed of different circle segments as shown in FIG FIG. 2 is shown with the circle segments with the radii R1 and R2. The sidecut can also be made from any radius. The use of a single radius would be possible. In FIG. 2 is further indicated as BMP the so-called binding mounting point, which determines the central binding mounting position. This central binding mounting position corresponds to a common mark on the shoe sole.

In FIG. 3 can be seen from the longitudinal section of the curvature of a conventional ski 10. This results in the front part 32 a concave Spitzaufbiegung, to which a convex middle part 30 and turn a concave rear part 34 connect. In the curve of the lateral crack, two turning points thus result, 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 limit the contact surface of the entire ski. With hv is in the FIG. 3 denotes the maximum preload. The respective ski thickness, which is also responsible for the stiffness of the ski, results from the distance between the contact surface 18 and the surface 24.

The contact lines KPV and KPH are also in the FIG. 2 drawn in dashed lines. Between these contact points is formed in free-lying flat ski the Bias curve off. This is greatest in the middle range between the contact lines KPV and KPH, as in FIG. 3 indicated by the maximum bias HV.

From the FIG. 4 The contact surface 18 of the unloaded ski 10 has a curvature course, starting from a central contact line KL in the middle part, which has a horizontal tangent, respectively to the front 32 and rear 34 a positive curvature without turning points having. As a result, so to speak, a positive bias curve is shown. The contact surface 18 simultaneously forms the bias line 19 and represents a continuous spline curve consisting of different curves without turning point, wherein the central contact line KL is arranged in the middle part. In the front part 32 and rear part 34 of the ski 10, the bias curve 19 already clearly lifts off the overlay.

How out FIG. 4 is clear, the upper surface 24 is formed flat in the central part, while curving toward the front part 32 and the rear part 34 upwards. As a result, the core 26 in the middle part is made thicker than the front part 32 or the rear part 34. The stiffness of the ski can be varied over its length. Advantageously, the ski has at least one 1 m long flat central part with a minimum total length of 1.5 m.

The effect of the different bias of the ski according to the prior art, as in FIG. 3 is shown, and the ski according to the invention, as in FIG. 4 is shown, can be seen from the diagrams 5 and 6, in which the edge pressure distribution are shown in aufgekantetem ski.

It represents the FIG. 5 the corresponding diagrammatically recorded edge pressure distribution KD of a conventional ski, which is loaded with a force F. In FIG. 6 By contrast, the edge pressure distribution KD of a ski F loaded with a force F according to the invention is shown.

Will be a conventional ski accordingly FIG. 3 loaded in the binding area with a force F, the edge pressure curve follows FIG. 5 , In the central loading area, that is to say in the area of the middle part 30, a pronounced maximum 40 of the edge pressure distribution arises when an applied force 11 is applied. But also in the contact areas KPV and KPH in the front 32 and rear 34 are maxima 42 and 44, respectively.

Out FIG. 6 the edge pressure distribution is shown in the ski according to the invention, wherein here upon application of a force F in the middle region, a clear maximum 40 is formed, which flattened continuously towards the ends 32 and 34 out.

Claims (7)

1. 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, wherein 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,
   characterized in that
   the upper side of the sliding board disposed opposite the contact surface is made flat in the middle part and is in each case curved at least toward the ends in the front part and rear part.
2. A sliding board in accordance with claim 1, characterized in that it has a lateral waist in its plan view.
3. A sliding board in accordance with claim 2, characterized in that the narrowest point (bm) in the middle part amounts to at least 0.07 m.
4. A sliding board in accordance with either of the claims 2 or 3, characterized in that in each case the side curve of the waist is composed of different radii.
5. A sliding board in accordance with claim 4, characterized in that the radii amount to between 10 and 30 m.
6. A sliding board in accordance with claim 1, characterized in that its total length amounts to at least 1.5 m, with the middle region, which is flat, being at least 1 m long.
7. A sliding board in accordance with one of the claims 1 to 6, characterized in that the central contact line is arranged in a region which extends 0.3 m before and behind the binding mounting point on the surface.

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