Lock Encyclopedia [Lock History]

Lock history

" Xue Yuan " æ›°: "Lock, the ancient key, this is the lock." "Ci Hai" is interpreted as: "The seal must be opened with a key." In addition, the lock has a layer of meaning: "a torture device made of iron rings," which is bound by restraint. The earliest lock is a simple organ designed by the owner to prevent others from opening. The simplest lock applied to the door is the latch. In ancient China, there were stone locks and no keys. They were tied by ropes or chains. During the Shang and Zhou Dynasties, the private ownership of production materials was further developed, the gap between the rich and the poor was further aggravated, and social contradictions were prominent. At the same time, the smelting technology was mature and immediately applied to the system. The lock industry, so there is a copper lock that can be opened with a key, and the iron lock matches different locks depending on the key. With the rapid development of science and technology, mechanical locks have also made great progress. Modern mechanical locks have been in existence for more than a hundred years. Balls of different lengths have been added to the lock cylinders, and the outer wires are opened with corresponding tooth-shaped keys. Later, it developed into a combination lock, magnetic lock, electronic lock, laser lock, voice lock and so on. On the basis of the traditional key, one or more sets of passwords, different sounds, different magnetic fields, different sound waves, different beam light waves, and different images are added. Such as fingerprints, retina of the fundus, etc.) to control the opening of the lock. Nowadays, locks have formed a very large family, and they are constantly improving and updating, constantly showing the world its magic. All in all, locks play a "shackle" function in human civilization, regulate social behavior, defend people's lives and property, and maintain social stability. In Europe, in the second half of the 19th century, locks became popular and entered private homes. Previously, the lock was expensive and had never been with ordinary people, but a symbol of wealth and power. In Japan, when the lock was brought in the past, people thought of the lock of the soil warehouse, and it was also a special product for the rich. ^[

Eyebolts And Eyenuts

The lifting ring nut refers to the part that the nut and the bolt or the screw are screwed together for fastening, and it is an original part that all production machinery must use. The lifting ring nut is a commonly used fixing pendant in engineering. There is a thread under the nut, which can be drilled according to its different specifications and fixed by the screw.

Eye Nuts,Eye Bolts Screwfix,Eyebolts And Eyenuts,Stainless Steel Eye Bolts

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