Apparatus is disclosed for releaseably and mechanically attaching an electric-motor-driven device (22), such as a ceiling fan, to an overhead support, such as a ceiling (10). The apparatus comprises a generally vertically disposed downrod (24) having an upper portion (25), a lower portion (46) and a...http://www.google.es/patents/US4810207?utm_source=gb-gplus-sharePatente US4810207 - Combined electrical and mechanical coupling for ceiling mounted device
Combined electrical and mechanical coupling for ceiling mounted device
