Patent ID: 7837217

Claim:
A Ski or snowboard having improved torsional rigidity, the ski or snowboard comprising: (a) a middle section including a location (i) provided for mounting a ski binding on an upper surface, or (ii) in which is provided at least one part of an assembly for an adjustable mounting of a ski binding; (b) a front section arranged forward of the middle section and joining a shovel to the middle section; (c) a rear section arranged rearward of the middle section and joining a tail or an additional shovel to the middle section; (d) a gliding surface arranged between a pair of edges, each extending substantially from the shovel to the tail or additional shovel; (e) a lower support assembly comprising a number of support layers, the lower support layers provided over the gliding surface and/or the pair of edges; (f) a core provided over the lower support assembly and, optionally surrounded with lateral flanks and/or a top layer as protection against undesired external influences and mechanical damage; and (g) a support arranged over the core, the support comprising support elements comprising external support regions, walls, and a bottom defined by a number of indentations, the support elements and the number of indentations arranged in at least two distanced planes, (i) wherein a width of the middle section of the ski or snowboard is smaller than a width of the front section and a width of the rear section of the ski or snowboard; (ii) wherein at least one of the planes of the number of indentations is located in a vicinity of the neutral bending axis or substantially coincides with the neutral bending axis, while the plane or planes of the external support regions are arranged a distance from the neutral bending axis in a direction away from the gliding surface; (iii) wherein the support is provided in the front section and in the rear section or at least in the middle section with at least one indentation in each, while the external support regions run over the middle section as well as over the front section and rear section; and (iv) wherein at least one indentation forms in a longitudinal direction in the front section or the rear section of the ski or snowboard a set of periodically repeating upward and downward arcs, constructed as cambered fields or sine-shaped arcs.