A keyswitch is described that may include two legs interleaved together without a pivot point approximately central to the legs. The keyswitch may also include a spring to engage at least one of the bottom surfaces of the legs. In one configuration, the legs of the keyswitch may each have two lower protrusions...http://www.google.es/patents/US6781077?utm_source=gb-gplus-sharePatente US6781077 - Keyswitch and actuator structure
