In a preferred embodiment, a threaded rotor for a linear actuator, including: a generally cylindrical, metallic shell/insert (20); and a generally cylindrical threaded thermoplastic member (72) disposed in a wall of the generally cylindrical shell/insert, the threaded thermoplastic member having threads...http://www.google.co.uk/patents/US6774517?utm_source=gb-gplus-sharePatent US6774517 - Injection molded threaded rotor and manufacture method
