Abstract: A speed retarding device for a rotary nozzle includes a hollow cylindrical housing and a rotatable tubular shaft rotatably carried by the housing. The shaft has a central axial bore and an enlarged drag sleeve portion carried in the housing. A pair of support bearings support the drag sleeve portion of the shaft in the housing. An annular inner seal between each of the support bearings and the drag sleeve portion defines a cavity within the housing receiving a viscous fluid confined within the cavity. The drag sleeve portion includes a peripheral helical groove and a plurality of axial bores extending therethrough parallel to the central bore, one or more blind axial bores each having a closed end an open end, and a piston disposed in each of the one or more blind axial bores each defining an air space between the closed end and the piston.

Abstract: A tillage element for use in a plough, harrow or the like is described which comprises a disc having a substantially planar portion and an inclined flange portion extending from the periphery of said central portion, an abrupt transition being provided from the central portion to the flange portion. The tillage element provides better penetration, inversion of soil and improved ploughing as compared with a conventional disc plough having concavely curved rotary discs. The invention also relates to tilling apparatus using a-plurality of such tillage elements and description is given as to how the tillage elements can be used in such apparatus in combination with a leg provided with a point with the tillage element being pivotable readily between positions, permitting both left- and right-hand ploughing alternatively to be carried out.

Abstract: A high-pressure rotary nozzle for cleaning the insides of pipes and vessels associated with the agricultural and petroleum industries, as well as in geothermal plants. The rotary nozzle provides a plurality of high-velocity, rotating, fluid streams to remove unwanted material from the interior surfaces of the pipes and vessels, wherein the nozzle comprises a central supporting shaft through which fluid flows into the rotatably mounted rotor body, the body being provided with jet-spray heads canted either forwardly or rearwardly of the line of longitudinal travel, and including thrust bearings located against each end of the body. The rotating speed of the rotor body is controlled by a plurality of free-floating bearing balls which bear against a stationary cup member as the body rotates on the central shaft. Guide members are secured to the cup member, allowing the nozzle to be continuously and centrally aligned during its longitudinal travel within a pipe.

Abstract: A speed retarding device for a rotary nozzle includes a hollow cylindrical housing and a rotatable tubular shaft rotatably carried by the housing. The shaft has a central axial bore and an enlarged drag sleeve portion carried in the housing. A pair of support bearings support the drag sleeve portion of the shaft in the housing. An annular inner seal between each of the support bearings and the drag sleeve portion defines a cavity within the housing receiving a viscous fluid confined within the cavity. The drag sleeve portion includes a peripheral helical groove and a plurality of axial bores extending therethrough parallel to the central bore, one or more blind axial bores each having a closed end an open end, and a piston disposed in each of the one or more blind axial bores each defining an air space between the closed end and the piston.