In an insertion connection assembly, a wall of a cavity of a socket which receives a plug to be inserted is provided with a tongue. The tongue is designed to lock resiliently in a plane notch on the plug. By making such provision, the sides of the connector are left free to form guides for inserting...http://www.google.es/patents/US6210201?utm_source=gb-gplus-sharePatente US6210201 - Insertion connection assembly
