The basic idea of today's most common lock is thousands of years old. Understanding how locks evolved explains why some modern locks are strong and others are not.
Ancient pin locks
Early pin locks used wooden pins that dropped into a wooden bolt; a large key lifted them so the bolt could slide. The principle, pins that must be raised to exactly the right height, survives today.
Warded locks
For centuries, many locks relied on wards, obstacles inside the lock that only a correctly shaped key could pass. They were easy to defeat with a simple skeleton key, which is why old rim and mortise locks with warded mechanisms offer little security.
Lever locks
Lever locks improved security by requiring several levers to be lifted to precise heights, and they remain common in some parts of the world.
The pin tumbler cylinder
The modern pin-tumbler cylinder, popularised in the nineteenth century, made reliable, mass-produced locks possible. It is still the heart of most North American residential locks.
High-security designs
Twentieth-century designs added sidebars, angled pins, rotating discs and patented keys to resist picking and bumping and to control key copying.
Electronic and smart locks
Today, motors and electronics can operate the same bolts using codes, cards, phones and fingerprints. The lesson from history holds: the strength of a lock depends as much on the door and frame as on the mechanism.
Our Toronto team works on everything from century-home mortise locks to smart locks: residential locksmith.
Why the history matters today
Understanding how locks developed helps explain why some old designs are still in use and why others are obsolete. The pin tumbler mechanism in most modern deadbolts is a refinement of a concept that is thousands of years old.
Turning points
Warded locks were easy to defeat with skeleton keys. Lever locks raised security by adding moving parts. The pin tumbler cylinder made precise, mass-produced locks practical and led to the standard hardware in most homes. Electronic locks then added credentials that can be changed or revoked without cutting a new key.
What it means for buyers
A lock's age is not the same as its quality. A well-made older mortise lock can outlast cheap modern hardware, while a smart lock is only as secure as its door. See high-security lock value and bump-resistant cylinders for modern choices.