The heart of the lock where the key is inserted. It contains a series of spring-loaded pins that must be aligned by the correct key to allow the plug to rotate.
Often seen on bike locks or vending machines; the pins are arranged in a circle rather than a straight line. Door Lock Mechanism Diagram
Often, a "broken" lock is just a door that has sagged, causing the bolt to hit the strike plate instead of sliding into the hole. The heart of the lock where the key is inserted
If you need to describe a diagram without showing it: Door Lock Mechanism Diagram
The mechanism that keeps the door closed. It includes the latch bolt—the spring-loaded piece that extends into the door frame. Strike Plate:
