SCREW DRIVE VEHICLE

摘要

A screw drive vehicle (10) has a main housing (20) with forward and aft ends (22, 24), and first and second lateral sides (26, 28). A first support arm (72) rotatably supports a first pontoon assembly (70a) from the first lateral side of the main housing. A second support arm (72) rotatably supports a second pontoon assembly (70b) from the second lateral side of the main body. A reversible motor (50) in the housing simultaneously rotates the support arms from positions parallel to one another and the main housing to non-parallel positions. Each pontoon assembly includes a tubular housing (82) with exterior screw thread (84) supported for rotation between distal ends of the arm and a reversible pontoon drive motor (130) operably coupled with the tubular housing so as to rotate the housing and thread in a selected rotational direction.