11 Facts About Protector lock

Term protector lock has referred to two unrelated lock designs, one invented in the 1850s by Alfred Hobbs, the other in 1874 by Theodor Kromer.

Protector lock was an early 1850s lock design by the leading American locksmith Alfred Charles Hobbs, the first man to pick the six-levered Chubb detector lock, at the Crystal Palace Exhibition in 1851.

That lock was created with the intent of being a lock that could not be picked.

Protector lock was distinct from Hobbs's other major lock design of the time, which he called the American lock and which slightly preceded the Protector lock.

The one advantage of the American lock over the Protector lock was its potential for greater security, if certain internal parts of the lock and key were arranged in a particular way.

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Protector lock of Theodor Kromer was a high-security lock first patented in Prussia in 1874.

Kromer's Protector lock was designed for mass production and was highly successful, rapidly outselling Bramah's.

Protector lock founded the Kromer company together with his brother Carl in 1868.

The Protector lock was not only hard to pick; it was difficult to tell what shape the key should have by mere inspection inside the key-hole.

Keys for the Kromer protector lock were designed to be extraordinarily difficult to copy.

Since the Protector lock could be fitted to anything from a small strong-box to a huge bank vault, the keys were made in corresponding lengths, including foldable keys with sufficient length to pass through a thick vault door.