Abstract: A linear recirculating roller bearing assembly comprises a bearing body having a load bearing surface and a return surface disposed substantially parallel to each other and defining a path for continuous recirculating movement of roller bearings thereabout. A plurality of substantially identical roller bearings are disposed along the path in engagement with the aforementioned surfaces. Each of the roller bearings has a longitudinal axis and includes at least two cylindrical load bearing portions and at least one cylindrical axle portion disposed intermediate the load bearing portions. The portions of each roller bearing are substantially concentric with the longitudinal axis of the latter and the axle portion has a diameter smaller than the diameter of the load bearing portions.

Abstract: An apparatus for converting the periodic undulations of a body of water into electrical energy includes a support structure adapted to be mounted in a substantially fixed position relative to the surface of the body of water and extending a substantial distance above the surface. The apparatus also includes a float member movable relative to the support structure in response to the undulations of the surface, an electrical generator mounted on the support structure for generating electricity, and a nut and lead screw assembly of the type comprising a threaded screw member, a threaded nut member, and bearings disposed therebetween whereby the screw and nut members are axially and rotatably movable relative to each other. The screw member is connected to the float member, and the nut member is operatively connected to the generator whereby movement of the screw member with the float member drives the nut member and generator.