Land vehicles – Skates – Runner type
Patent
1991-12-04
1993-10-05
Johnson, Brian
Land vehicles
Skates
Runner type
280607, 280608, 280609, 280610, A63C 504, A63C 514, A63C 507
Patent
active
052498190
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a ski with a running surface-and a hollow ski body, the standard height, measure with respect to the running surface, varies over the length of the ski.
Description of the Related Art
A plastic ski is already known from Austrian Patent AT-PS 309 282, the upper chord and lower chord of which or its running surface component and the surface component facing away from the running surface, are connected with each other by means of longitudinally extending connectors laterally offset from each other. A hollow ski body is formed in this way, in which the height of the connector can be chosen by means of an appropriate shaping of the form in such a way that the result is a structural height of the entire ski which varies in the longitudinal direction of the ski. In connection with such known plastic skis it was required to use a separate mold for every type of ski and for each constriction of the ski in order to form the appropriate hollow spaces in the core of the ski after the individual components had been connected. Relatively unpredictable sturdiness and relatively large fluctuations of the torsional behavior of the ski body are the result of such shaping of the hollow body, with lateral surfaces of the core following the respective lateral contours of the ski. This is particularly true in connection with the forming of special skis with varied constriction.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a ski of the previously mentioned type where it is possible to define more exactly the properties of sturdiness, flexibility and torsional behavior over the length of the ski and to make them as independent as possible of the constriction of the ski. To attain this object, the ski of the invention is provided with a ski body in the form of a hollow body with lateral edges which are parallel to each other and extend in the longitudinal direction of the ski. The width of the ski body is less than or equal to the narrowest width of the constricted running surface component, measured crosswise to the longitudinal direction of the ski. Based on the fact that a ski body of generally even width is formed as a hollow body, it is possible to predetermine a defined and high torsional stiffness by simply presetting the respective ratio of height to width. By means of such a component it is possible to determine, in particular, the most advantageous ratio of width to height, particularly in the end areas, namely the areas of the tip and the end of the ski. Selection of such a hollow body of even width as a ski body has as a result that, depending on the constriction of the ski, the running surface component extends differently beyond the sides of the ski body. The running surface component can be distinguished by relatively good lateral stiffness and in particular by even lateral stiffness. The fact that the running surface component laterally extends beyond the ski body results in particular in an improved grip on ice because of narrow lateral contact surfaces when the ski is tilted. For this reason it is necessary, as provided by the invention, that the width of the ski body be less than or equal to the narrowest width of the constricted running surface component, measured crosswise to the longitudinal direction of the ski.
The ski body, or hollow body, can be advantageously provided as a shell body and can be enclosed at the side facing away from the running surface component by an upper chord component. Considerable technical manufacturing advantages ensue even with the embodiment of such a hollow body in the form of a shell body. In this embodiment it is possible to retain the same width of the ski body over the entire length of the ski, because the upper chord need not extend beyond the lateral edges of the ski body in any way. With the embodiment of the hollow body as a shell body it is therefore possible to use a core of extruded profiles which are continuously produced and cut to the length of a ski, and
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Head Sportgerate Gesellschaft m.b.H. & Co. OHG
Johnson Brian
LandOfFree
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