A rotatable hinge has a rotatable bracket, a pivot bracket and a pivot shaft. The pivot bracket is mounted below the rotatable bracket and has two connecting walls perpendicularly formed on the pivot bracket and two stands mounted on the connecting walls. One connecting wall has a pivot hole and a pintle....http://www.google.de/patents/US7469449?utm_source=gb-gplus-sharePatent US7469449 - Rotatable hinge
