An apparatus for continuously transmitting electrical energy or a fluid stream between a fixed terminal and a continuously rotating terminal through a flexible continuous transmission element, such as an electric cable or a tube, comprises three rotors having a common axis of rotation, namely an outer...http://www.google.es/patents/US4230263?utm_source=gb-gplus-sharePatente US4230263 - Apparatus for accomplishing unlimited relative rotation of the ends of a filiform transmission element
Apparatus for accomplishing unlimited relative rotation of the ends of a ...
