Robert Barron invented the lever lock in 1778. This constituted a considerable improvement over the ancient warded lock. It was based on a series of several “levers” that must each be raised to their own set height
Since its design the lever tumbler lock has undergone numerous improvements.
Lever locks, though limited in use, can still be found today in some hospitals, suitcases, cabinets, fine furniture, and attache cases. Lever locks are also used on safe-deposit boxes, often with fifteen or more levers and sometimes requiring two keys. You are going to find out ways to open the lever lock with a little history in this document.