Security door-locking device with electric release switch esp. for prison cells

摘要

The door lock (3) accessible only from the outside is associated with an additional latching lock (7) and an electrical opener (6), enabling the door to be opened from the inside. The additional locking elements can be unlocked by a switch actuated either by another closure mechanism (4) or additional operation of the main lock (3). The key used to open the latter is inserted into the additional closure mechanism to draw back its locking shaft by a few millimetres so that the switch actuates the opener. The switch can also be used to actuate a part (9b) co-operating with the manually operated bolt (9a) of a magnetic device limiting the opening of the door.