Abstract: A flexible boot of the polymeric type for use with a universal joint where the boot has a radially outermost generally tubular wall section that interconnects to the boot body by oppositely facing peaks and valleys. The thickness of the boot sidewall is controlled to effect desire bending where, in one embodiment, peaks and valleys are thicker than an adjoining sidewall of a corrugation.

Abstract: A molded elastomer having high and low temperature resistance in dynamic applications. The elastomer includes the reaction product of an amine or hydroxy terminated polyol having an unsaturated level of less than about 0.06 milliequivalents per gram polyol, an hydroxyl or amine terminated chain extender, and a polyisocyanate-containing prepolymer capable of rapid reaction times with said chain extender when admixed together in a mold.

Abstract: A high and low temperature resistant endless belt is disclosed. The belt includes a main belt body portion prepared from elastomeric material and a tensile member disposed in the body portion. A sheave contact portion is formed integral with the main body portion. The elastomeric material has high and low temperature resistant properties. The elastomeric material is formed from the reaction product of an amine or hydroxy terminated polyol, an hydroxl or amine terminated chain extender, and a polyisocyanate-containing composition adapted for rapid reaction with the extender when admixed therewith in a mold to retain flexibility and resiliency over heat age of the belt.

Abstract: A toothed belt having fore and aft tooth flank surfaces defined in cross section by arcs having radii generally equal to the pitch spacing of the belt teeth. A sprocket having teeth with fore and aft flank surfaces defined in cross section by arcs having radii generally equal to the pitch spacing of the sprocket teeth. In combination, a drive comprising the belt and sprocket as described.