Lock and key dating

A tumbler is a lever, or pawl, that falls into a slot in the bolt and prevents it being moved until it is raised by the key to exactly the right height out of the slot; the key then slides the bolt.

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During 1st millennia BC, locks finally started improving with the technologies and designs that were introduced by Greeks and Romans.

Greek locks were commonly viewed as unsecure, but they gave inspiration to the Roman innovators who quickly managed to improve upon Greek and Egyptian locks by introducing metals as their primary materials.

This new wave of lock innovation was led by the inventions of Robert Barronin 1778 (double-acting tumbler lock), Joseph Bramah in 1784 (Bramah lock, unpickable for 67 years), Jeremiah Chubb in 1818 (detector lock with high internal security), Linus Yale, Sr.

in 1848 (first pin tumbler lock), James Sargent in 18 (first combination lock and first time lock mechanism), Samuel Segal in 1916 (first jemmy-proof lock) and Harry Soref in 1924 (first padlock).

Onerefinement was to conceal the keyhole by secret shutters, another was to provide blind keyholes, which forced the lock picker to waste time and effort.

The 18th-century French excelled in making beautiful and intricate locks.tumbler lock.

By utilizing iron locks, Romans were finally able not only to have very strong protection against brute-force attacks, but also keys were for the first time small that they could be worn in pockets, on as a pendant or even infused into rings.

During this time wards were also developed, ensuring that only correct key with correct shape of projections can push corresponding pins before lock could rotate and throw the bolt.

In the Middle Ages, great skill and a high degree of workmanship were employed in making metal locks, especially by the German metalworkers of Nürnberg.

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