A mobile terminal, such as a mobile telephone, has a hinge with a helical spring and which provides both snap opening or automatic opening upon activation of a release means as well as a freely selectable angular position between the rotating parts of the terminal. Also, a new type of spring hinges or...http://www.google.fr/patents/US7079874?utm_source=gb-gplus-shareBrevet US7079874 - Transformer hinge design
