A strain-relief end bell for an electrical connector assembly includes a ratcheting mechanism that allows the end bell to resist vibration-induced decoupling once it is threaded onto an electrical connector. The ratcheting mechanism includes a retainer ring that is seated between an internally-threaded...http://www.google.com.au/patents/US4808123?utm_source=gb-gplus-sharePatent US4808123 - Self-locking strain-relief end bell for electrical connector assembly
