Abstract: The invention relates to a propeller assembly, particularly suitable for use with axial flow pumps. The propeller assembly is provided with a cam-operated rotatable propeller blade compression shaft which rotates in response to a detected increase load on the propeller blade. An elongated rod connected to a power source transmits movement to a spring which, in turn, transmits the movement to the cam. To accommodate tilting of the propeller blade during changing of the pitch, a hub outer surface is formed convex and the inner surface of the enclosing shroud is formed concave. The radii of curvature of the hub and the shroud are generally complementary to the radius of curvature of the inner and outer surfaces of the propeller blade, respectively.

Abstract: The invention relates to an axial flow pump installation and utilizes a motor for transmitting a torque to a rotary shaft extending from the motor to a bearing house. Mounted within the bearing house and circumferentially engaging the motor are a pair of thrust bearings and a radial floating bearing spaced a distance above the thrust bearings. A thrust retaining tube press fit between the floating bearing and the pair of thrust bearings retains the pre-determined distance between those bearings. The lower, thrust bearings bear a primary shaft thrust load, while the upper, floating bearing minimizes vibration of the shaft. A lubricant circulation passageways are formed for continuous circulating of the lubricant from a high pressure side to a low pressure side of a pump.