How to match a key without a key? The door lock is the door lock of an ordinary room.

Remove the lock cylinder and observe the position of the lock teeth. There is a strip seal behind the lock tooth, mostly copper seal, and the old one is aluminum seal. After being pried open slowly with a sharp weapon, there is a spring inside. There are two teeth behind each spring, one is a fixed tooth and the other is a moving tooth. After removal, insert the appropriate key fit, take out the lock core, put back the movable teeth, smooth the parts that exceed the height of the lock core round surface with a punch, and then reinstall.

Or remove the lock cylinder and get the key. Then get the keys.

There is also a single lock cylinder 10-60 yuan with 3-7 keys. When pressing the lock, pay attention to the position of the toggle shaft and the length of the lock.

Keys are common unlocking tools in people's lives. The main materials for making keys are copper, zinc, aluminum, iron and other metals. Keys were invented later than locks and appeared in ancient Egypt 4000 years ago. There are many kinds of keys, including ordinary keys, intelligent key, remote control keys, electronic keys and so on.

origin

When primitive people lived in caves, for safety, they sometimes pushed boulders to block the entrance of the cave. It is not a thief but a wild animal. After the emergence of private ownership, thieves appeared and locks were born. As early as 3000 years ago, China had locks. But the earliest locks had no mechanism, but were made in the shape of fierce animals such as tigers. In order to scare away thieves, they could only be said to be symbolic locks.

It is said that Lu Ban was the first person to lock the lock. According to unearthed cultural relics and written records, ancient locks worked by the elasticity of two leaf springs. Until now, this spring is still in use.

In foreign countries, although the ancient Greeks invented an extremely reliable lock, it is difficult to popularize it in ordinary families because the key is large and must be carried on the shoulder. The ancient Indians made a bird-shaped "mysterious lock", and the keyhole was hidden in the wings that could shake. The rise of modern locks was first invented by the British in the18th century. Our widely used pinball lock was invented by American Nirus Yale Jr in 1860.

Keys were invented later than locks, and ancient Egyptians were the first people to use keys in the world. Their lock is to insert a wooden latch into a groove with a wooden latch at the top of the groove. After the door bolt is inserted into the groove, the wooden bolt will be inserted into the hole of the door bolt. In this way, the door bolt is very strong and must be opened with a key.

Because the Egyptian lock can only be used on the side with the bolt, which is not conducive to flexible opening and closing, the Greeks developed a lock that can be opened from the other side. The key made by the Greeks is a curved wooden stick, which is very similar in shape and size to the sickle used by farmers. However, some keys are as long as 3 feet and must be carried on the shoulder to move, which is quite heavy.

The Romans were the most exquisite locksmiths in ancient times. They are very familiar with the standards for making keys and have learned how to cut nails at the end of keys into various shapes.

(Source: Baidu Encyclopedia: Focus)