(under subclass 67) Subject matter wherein significance is attributed to the configuration of the contacting portion said parts in rolling contact, or to the material from which said portion is formed. [figure] [caption] In a friction pinion the combination of toothed hub attached to a shaft, a rubber vulcanite material mounted upon the hub, circumferentially surrounded by flexible rubber material encased in a leather band to secure maximum wearing service of the friction pinion during its operation.
