Abstract: A passive body-motion generating device particularly adapted for moving a leg through natural or representative hip joint articulation, the device having body support structure, at least one leg support member having a proximal end, a distal end and a longitudinal rest axis, a hinge mechanism connecting the proximal end of the member to the body support structure, the hinge mechanism having a first pivotal axis providing generally vertical rotation for the member and a second pivotal axis providing generally lateral rotation for the member, these axes being oriented at substantially right angles to each other, and at least one motor associated with the hinge mechanism for rotating the same and the member about each of the two axes of rotation either simultaneously or in tandem, the tandem rotation being operative to selectively describe a plane or a curved surface with the member.

Abstract: A passive body-motion generating apparatus having a base, a lower body support, an upper body support, the top of each said suport providing a body contact surface, said supports each having a pivot end portion lying substantially adjacent each other, cooperating pivot mechanisms on each of the pivot end portions and base for allowing rotative motion of each body support through an arc sector, the pivot axes of the pivot mechanisms being substantially parallel and in proximity to each other, and a power train mechanism on the base in operative association with both body supports for imparting simultaneous rotative force thereto.