Abstract: A pulley suitable for use in a V-type belt drive power train, the pulley including an integral securing mechanism in the central bore thereof for engaging a corresponding securing mechanism on the shaft of the device to be driven by the pulley, the integral securing mechanism preferably being corresponding screw threads, with a method of manufacturing the pulley from cylindrical bar stock as a unit including the generation of the V-belt grooves, the central bore, forming the integral securing mechanism in the central bore, and cutting off the pulley to provide a one-piece pulley of substantially simplified design.

Abstract: Sacrificial rods have been used in connection with shell and tube type heat exchangers to prevent corrosion of the cooling cores. These rods however have been employed with metallic heat exchanger components. The subject heat exchanger uses electrical non-conducting or plastic end covers which will not conduct a current flow. The end covers are provided with an electrical conducting metal sleeve, a metallic insert and an electrical conducting member which is connected in an electrical conducting relationship to the insert and at least one of the metallic sleeves. Thus, a grounded circuit is provided for the sacrificial rod. The reaction of the electrolyte and the rod prevents electrolytic damage to the core.