A ceiling-supported suspension mechanism for a piece of equipment, in particular for operating lights, has a pivot arm, as extension, which is arranged on the rotary bearing of a ceiling mount such that it can be rotated about a vertical axis. The pivot arm has two sub-arms which are connected to one...http://www.google.es/patents/US6431515?utm_source=gb-gplus-sharePatente US6431515 - Ceiling-supported suspension means
