A magnetic switch has a fixed contact, a movable contact, and a flat, flexible blade supporting the movable contact, and movable between first and second positions in which the contacts are respectively engaged and disengaged. A blade magnet is affixed to the free end of the blade and is movable with...http://www.google.fr/patents/US4489297?utm_source=gb-gplus-shareBrevet US4489297 - Magnetic switch
