The metal plate screwed into the door frame. The bolt slides into this to secure the door. 2. The Anatomy of a Knob or Lever Lock
End of Report.
Requires a key on both sides. Used for doors near glass windows to prevent someone from breaking the glass and reaching in to turn a thumbturn. door locks diagram
The diagram makes clear that in 99% of electronic locks, the motor/solenoid releases a manual mechanism; the bolt is still thrown by hand—a failsafe design. The metal plate screwed into the door frame