The door-mounted water and ice cube dispenser of a refrigerator is supplied with chilled water and electrical power by a water conveying conduit and a plurality of electrical conductors which together pass through a hollow pintle and socket portion of a lower hinge assembly pivotally supporting the refrigerator...http://www.google.es/patents/US4543800?utm_source=gb-gplus-sharePatente US4543800 - Refrigerator door hinge
