The pin tumbler lock is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key. The mechanism has ancient origins in Mesopotamia, while the modern form was developed in the 19th century by Linus Yale Sr. and Linus Yale Jr..
Without a key in the lock, the driver pins (blue) are pushed downwards, preventing the plug (yellow) from rotating.
When an incorrect key is inserted into the lock, the key pins (red) and driver pins do not align with the boundary between the plug and the bible, preventing the plug from rotating.
When the correct key is inserted, the gaps between the key pins and driver pins align with the boundary between the plug and the bible.
With the gaps between the pins aligned with the boundary between the plug and the bible, the plug can rotate freely.
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