Ski with three-dimensional running surface

The device of claim 11 wherein the curvature of said protuberances in the transverse direction of the running surface is symmetrical to the vertical line of the protuberances in the longitudinal direction of the running surface.

A snow ski having a front end and a rear end and a three-dimensional bottom running surface composed of polymeric material secured to the bottom surface of the ski, which running surface comprises a plurality of arcuate convexly curved protuberances having a forward curved edge, the protuberances inclined with respect to the bottom plane of the running surface and rising towards the rear end of the ski to prevent backward movement of the ski in use, said protuberances especially being scale-like and characterized in that the surface of said protuberances is convexly curved in longitudinal and in transverse direction of the running surface to provide for improved forward gliding properties of the ski, the protuberances aligned in rows substantially transverse to the longitudinal direction of the ski, with each succeeding row of protuberances being offset from the preceding row and wherein the boundary line of said protuberances, which faces the front end of the device, lies substantially in the bottom plane of the running surface of the ski.

A base sheet material adapted for use as a running surface of a ski having a front end and a rear end, which base material has one surface thereof which serves as a running surface with a plurality of protuberances which are inclined with respect to the bottom plane of the running surface and rise towards the rear end of the ski, said protuberances especially being scale-like and characterized in that the surface of said protuberances is convexly curved in longitudinal and in transverse directions of the running surface and wherein the boundary line of said protuberances, which faces the front end of the ski, lies substantially in the bottom plane of the running surface of the ski.