The electromagnetic locking apparatus functions on a lock cylinder with a rotor, to whose end is fitted in rotation-restrained manner a driver and a stator surrounding the rotor. It is positioned with respect to the lock cylinder and a control part engageable with the apparatus. The apparatus is characterized...http://www.google.fr/patents/US4730471?utm_source=gb-gplus-shareBrevet US4730471 - Apparatus for electromagnetic locking on a lock cylinder for a mechanical/electronic locking system
Apparatus for electromagnetic locking on a lock cylinder for a mechanical ...
