A friction clutch (440) for use with a 360 degree dual pivot point hinge (106) permits rotation about but one pivot point axis (444 or 445) at a time to assure proper 180 degree operation of each hinge member (411, 413 and 412, 414) associated with the hinge (106), thereby eliminating the misalignment...http://www.google.fr/patents/US5325984?utm_source=gb-gplus-shareBrevet US5325984 - Friction clutch for dual pivot point hinge
