A multi-function control key structure formed of a key cap and a springy key body is disclosed for different triggering controls by means of a center shank of the key cap and a plurality of triggering rods of the key body around the center shank. The key cap has driving rods spaced above the triggering...http://www.google.com/patents/US6844511?utm_source=gb-gplus-sharePatent US6844511 - Multi-function control key structure
