Abstract: An amphibious mobility assist vehicle for mobility impaired persons wherein a main flotation body has a catamaran configuration of twin hulls and constructed of molded thermoplastic material filled with plastic foam material of closed cell construction. A pair of conventional wheelchair-type wheels are detachably connected to the rear portion of the main flotation body on each side of a seat portion thereof, and a pair of hollow, spherical, flotation, caster mounted wheels are connected to the front of each hull. A manually actuated lift mechanism, which is accessible to the occupant of the vehicle, is connected to each spherical wheel so that the spherical wheels can be individually moved from a ground engaging position to an elevated position when the vehicle is floating in a body of water.

Abstract: An aquatic wheelchair having a main flotation body of thermoplastic material of closed cell construction including a seat portion and an integral backrest portion. Flotation paddle wheels are connected to the seat portion and a flotation stabilizer wheel assembly is detachably connected to the backrest portion. The flotation paddle wheels are constructed and arranged to facilitate the grasping thereof by the user for manually propelling the wheelchair not only on soft terrain but also in water.