Abstract: Mount 10 for attaching a boot binding 110 to a snowboard 100 allows free swiveling of binding 110 in a plane non-parallel to the deck of snowboard 100. Mount 10 includes a swivel assembly 20 with an upper face 8 for attaching a boot binding 120, a lower face 5 for attaching a snowboard, and cant disk 60 for canting boot binding 110 to an angle non-parallel to the deck of snowboard 100.

Abstract: Mount 10 for attaching a boot binding 120 to a snowboard 100 allows free swiveling of binding 120 in a plane parallel to the deck of snowboard 100. Mount 10 includes a swivel assembly 20 with an upper face 8 for attaching a boot binding 120, a lower face 5 for attaching a snowboard, and cant disk 60 for canting boot binding 120 to an angle non-parallel to the deck of snowboard 100.

Abstract: A sportboard device (10) for movement over a fluid medium, including water, snow, or ice; including a plurality of pivotable fin assemblies (20) for transferring force from the user's feet to the fluid. Fin assembly (20) includes foot platform (30), transmission shaft (51), and fin (21). User stands on foot platforms (30) with feet secured by strap (34), binding (35), or friction surface (36). Twisting the feet pivots foot platforms (30). Torque is transmitted through shaft (50) to fin (21), causing fin (21) to pivot against the fluid medium. Coordinated movements of foot platforms (30) cause sportboard (10) to move relative to the fluid in the absence of gravity, wind, or wave force or in a direction different from that of the natural force.