A key assembly comprising a base; a manually operable key secured to, and mounted above the base by, a resilient key mat having an upstanding wall. The key is moveable against the resilience of the upstanding wall towards the base. A guide assembly extends between the base and the key to guide movement...http://www.google.com/patents/US5777281?utm_source=gb-gplus-sharePatent US5777281 - Key assembly
