Additional blocking mechanism for door lock - has knob actuated slider for pin entering hole in lock bolt (OE 15.1.79)

摘要

The door security system has an additional lock actuated by a knob, operated only with a special key. The lock is separate from the cylinder lock. The door has on its outer side a concealed slider (20) moving at right angles to door lock bolt. This slider is coupled by a knob (14) and bolt (16) passing through the door frame for actuation. The slider actuates a blocking pin (11) which enters a hole (13) in the locking bolt. The pin is pushed into this hole or out of it.