Lock and key
device · 700 BC · Ancient world
A mechanical locking device.
What it is made of
- Pin tumbler lock — has part. The pins keep the cylinder from turning without a key.
- Spring — has part. Springs press the pins.
Principles and materials it uses
- Brass — is made of. Cylinders and keys are often brass.
- Wood — is made of. The Egyptian pin lock is wooden.
Where it is used
- Letter box — is part of. A lockable door for collection.
History: what it evolved from and what it influenced
- Smart lock — evolved into. An electronic lock.
What it is a kind of
- Padlock — includes. A padlock.