Abstract: A fluid transducer including a reciprocatory piston member and a rotary member, and a drive mechanism for converting reciprocation of the piston member into rotation of said rotary member, or vice versa. The drive mechanism includes a first elliptical member rotatable with said rotary member and a second elliptical member rotatably mounted within said transducer and arranged for reciprocation with said piston member. The elliptical members are retained in engagement, and rotate in unison as said piston member reciprocates with respect to said rotary member to transmit motion between said piston and rotary members.

Abstract: A drive arrangement for producing a rotary motion by means of a fluid or eous pressure medium in which a working shaft and an eccentric part within a housing are acted upon by at least one freely deformable expansion cell mounted between the housing and the eccentric part in such a manner that expansion of the collapsible cell exerts a rotational moment on the eccentric part, a force that is directed along the central axis and therefore along the working shaft. The expansion cells are connected with the working medium by suitable control means.

Abstract: A radial piston pump wherein the crank pin of a crankshaft engages with arcuate shoes at inner ends of radially extending pistons which are reciprocable in discrete cylinders. The outer end of each cylinder normally bears against the convex sealing surface of a discrete back support having in the sealing surface a pressure port for evacuation of pressurized fluid in response to outward movement of the respective piston. The cylinders are caused to move their outer ends away from full engagement with the respective sealing surfaces in response to inward movements of the respective pistons so that the chambers of the cylinders can draw fluid from the interior of the pump housing. The cylinders are caused to move substantially radially and away from the respective sealing surfaces due to frictional engagement between their internal surfaces and the external surfaces of the respective pistons.

Abstract: There is disclosed a cylinder wheel connected in rotary engagement with a ball-piston wheel, the cylinder wheel having a multiplicity of cylindrical cavities, each cavity having at least one coil with a plurality of electrically conductive turns circularly disposed therearound. The ball-piston wheel has a multiplicity of balls of magnetic material or permanent magnets which engage the cylindrical cavities. The coils may be periodically activated by selectively applying electric current thereto to sequentially propel each ball into and out of the respective cylindrical cavity thereby turning the cylinder wheel and ball-piston wheel in rotating motion. When the balls are magnets, and the cylinder and ball-piston wheel assembly is rotated by an external driving means, a voltage is induced in each coil as a permanent magnet ball passes therethrough thereby forming an electric generator.