Gear for chain drives comprising a gear body of cast material having a hub section, a gear rim section with spur teeth, and a web section joining said hub and gear rim sections, and a ring plate of metal embedded in the web section, the outer edge of said plate being near the bottom of the areas between...http://www.google.com/patents/US4589860?utm_source=gb-gplus-sharePatent US4589860 - Gear and method for making the same
