Abstract: A piston pump assembly comprising a housing, a piston member mounted for axial movement in a bore of the said housing forming a piston chamber, and arranged coaxially relative to a drive shaft, said piston comprising a thin-walled member of generally cup shaped configuration, cam means associated with said drive shaft disposed in the recess of said cup shaped piston and cam follower means associated with said piston operatively connected to said cam means whereby rotation of said shaft effects through said cam and cam follower means axial back and forth movement of said piston in said piston chamber.

Abstract: Rotary piston assembly comprising a housing having a bore, a piston rotatably mounted in the housing, a plurality of slide vanes distributed about the circumference of said piston, each slide vane supported for pivotal movement about an axis parallel to the axis of rotation of said piston, said slide vanes operable to pivot and engage the bore of the housing during rotation of the piston due the effect of centrifugal force, each of said slide vanes being of arcuate, vane shaped configuration having an enlarged end section of generally circular cross section, means defining a plurality of axially directed, circumferentially spaced arcuate recesses on the outer peripheral surface of said rotary piston to receive the end sections of said pivoted slide vanes.

Abstract: A universal joint assembly for transmitting a moment of rotation in both directions between two members comprising an outer joint element and an inner joint element, the joint elements have confronting spherical surfaces wherein one of the surfaces is smoothly spherical and the other surface has a series of generally axially extending circumferentially spaced grooves having flanks open at an angle, the joint assembly includes a plurality of rolling elements in the annular space between the confronting surfaces which engage in the grooves and a cage having a plurality of pockets disposed between the confronting surfaces of the joint elements for guiding the rolling elements. At least a pair of rolling elements are located in a common pocket of the cage and elastic preloaded member is disposed between the rolling elements in each pocket which is operable to press the rolling elements reciprocally in a peripheral direction against the related flank of the groove.