A first connector includes opposite ball and socket elements having a passageway formed therethrough. The socket element has a cavity formed therein for receiving a ball element of a second hose connector to form a hose assembly. A ring is disposed within the cavity for limiting pivotal movement of a...http://www.google.de/patents/US5449206?utm_source=gb-gplus-sharePatent US5449206 - Ball and socket joint with internal stop
