Patent ID: 7504597

Claim:
A key switch comprising: a switch part; and an operating part for having an operating key inserted thereinto so as to activate said switch part to switch contact points, said operating part including: a driver cam configured to rotate by being pushed by said operating key and to thereby activate said switch part; and a plurality of lock cams configured to directly lock said driver cam in a normal locked condition when said operating key is pulled out of said operating part and to rotate by being pushed by said operating key so as to release said driver cam from said normal locked condition; wherein said driver cam has a first rotary shaft and a first engaging protrusion at center of rotation; wherein said lock cams have a second rotary shaft and a second engaging protrusion at center of rotation; wherein said second engaging protrusion becomes disengageably engaged with said first engaging protrusion to prevent said driver cam from rotating when said lock cams are not being pushed by said operating key; and wherein said second engaging protrusion is caused to rotate to thereby disengage said first engaging protrusion from said second engaging protrusion and to make said driver cam rotatable if said operating key pushes to cause said lock cams to rotate.