Electromagnetically operated security lock esp. for safe-deposit doors

摘要

The bolt (2) incorporates a slot (2b) where it can be retracted by means of a key (S) subject to correct positioning of tumblers (3,3'), pivotable about a spike (4) on the floor (1a) of the casing (1) and co-operating with a fixed pin (2c). The bolt is also secured by a pref. battery-powered electromagnet (5) provided with two microswitches (7a,7b) to reduce its current consumption. The first microswitch (7a) is closed by a lever (9) operated by a key bit at the beginning of rotation of the key. Further rotation opens the second microswitch (7b) after the pin has entered the slots (3b) in the tumblers.