Sliding device, particularly alpine ski

Claim 1

A snow ski, comprising: a longitudinally extending runner having a gliding surface formed on an underside thereof and an upper surface extending from a front end to a rear end of said runner; an elongated member spaced above said runner only over a portion of the length thereof intermediate said ends and corresponding to a skiboot-supporting region of the ski, said member being parallel to said runner in said region; and a pair of rigid longitudinally spaced spacers affixed to said member and said runner and holding said member above said upper surface at opposite ends of said member, said spacers having substantially trapezoidal shapes with inclined flanks extending from respective end edges of said member to said upper surface, said end edges of said member being beveled to lie flush with said flanks, said member and said spacers defining on said runner a torsionally stiff flexure-resistant torsion box which is laterally open but is closed at its top by said member and at its ends by said spacers, said runner having flexible portions extending beyond said torsion box.