Lever tumbler lock

A lever tumbler lock is a type of lock whose mechanism uses a set of levers to prevent the bolt from moving in the lock. It does not mean a locking lever handle incorporating a cylinder locking device.

In the simplest form of lever lock, lifting the tumbler above a certain height will allow the bolt to slide past.

Lever locks developed throughout the nineteenth century, but those used in some parts of the world were of modest security, with large keys. When Yale's pin tumbler lock was developed in the late nineteenth century, that became a more popular lock. It has a small key, many differs, and an easily interchangeable cylinder locking device, and in much of the developed world has become the most popular key mechanism for doors and padlocks.

In some parts of Europe, and elsewhere, secure lever locks continue in use for doors, and safes.