Abstract: A protective tip cover for the sharply angled nose portion of a surfboard for reducing or preventing injury to the user upon impact with the nose portion of the board. Tip covers may be used for any type of surfboard, including those used for wind surfing. The cover comprises a relatively soft, resilient (e.g., silicone), generally V-shaped member provided with a gently rounded apex portion and a pair of rearwardly extending wing portions which merge into side surfaces of the board. Where used with a wind surfing surf board, the tip cover has a substantially flat bottom and gradually curved top. Upper and lower surfaces of the board may be provided with slots extending from the juncture of the wing portions toward the apex. An after market kit is also provided for enhancing the safety of existing boards. The kit includes a surfboard tip cover, suitable primer and adhesive, applicators and installation instructions.

Abstract: A wheel capable of changing traction surface and track by varying the usual axis of rotation. The amount of this contacting surface can be varied and the path can be varied from usual linear to curvilinear contact. Full X, Y, and Z operation is characterized by largely symmetrically curved sinoisoidal-like motion.