A snap hinge assembly for rotatably connecting a flip cover to a portable phone housing has only two parts, a hinge pin and a spring. The hinge pin is rotatably mounted in the housing and secured to the cover so as to rotate with the cover as it is opened and closed, and has a cam portion for engaging...http://www.google.de/patents/US6157717?utm_source=gb-gplus-sharePatent US6157717 - Snap hinge mechanism for flip style portable phone
