A coupling apparatus having coupling body with a mechanical latch assembly. The mechanical latch assembly includes a modified latch plate. The latch plate defines a main portion having a top end and a bottom end and includes an annular aperture disposed between the top and bottom ends. A lever portion...http://www.google.co.uk/patents/US20100295295?utm_source=gb-gplus-sharePatent US20100295295 - Coupling with Latch Mechanism
