In the Middle Ages, nobles and merchants with money and jewelry not only needed locks and keys to lock the door, but also needed safes, drawers and wardrobes, which stimulated the creativity of craftsmen. In the Middle Ages, padlocks were generally used, and the inserted locks were replaced by marbles rotating on the pivot. Another improvement that is more difficult to pick a lock is to insert a number of so-called tenons between the key and the lock hole, so that the key teeth can just pass through the tenons.
Modern locks and keys can be said to have started with the Brammer lock of 1778: this lock has six sliders-metal plates with grooves. Before unlocking the lock with the key, the slider must be placed in the appropriate position. The inventor of this lock was Brammer, who was one of the technical minds in Britain at that time. He invented many things, including hydraulic press, toilet, printing machine, paper machine and soda machine.
Then the chabu lock appeared: 18 18 was invented by a hardware dealer named chabu in Portsmouth. Chabu later set up a fire safe factory. His main improvement on the lock is the addition of a "probe". If someone tries to pick the lock, the probe will fix the bolt.
Yale lock invented by American Yale has been used since 65438+60s. It's a tumbler lock. The key is small and flat, interlocking with the lock slot. Its security lies in endless key shapes. In fact, no two Yale locks are the same, but there is a master key that can open many locks, such as hotel keys. Since then, the safe has had a combination lock. If you don't know the combination of a series of numbers, you can't open the lock. There is also a time lock to lock the vault. There is a clock or two in the lock, which can't be opened until the scheduled time.