Mechanical lock is a kind of security equipment. It is a device that can only be opened with a key created by human beings in order to maintain their own industry. Mechanical lock is used to prevent items from being opened and removed, and plays the role of protection, management and even decoration.

Wooden locks can be said to be more detailed locks in the early stage of China. Wooden locks in the early stage were found in the Yangshao cultural site 5000 years ago. There were written records of wooden locks and keys in the Zhou Dynasty. The structure of the wooden lock in the early stage is relatively simple and bulky. The key is mostly made of bamboo rods and wooden sticks, which is easier to open. In the spring and Autumn period and the Warring States period, after the improvement of Luban, they began to use copper to make keys, and the confidentiality was enhanced. In China, folk wooden locks have been used until the Ming and Qing Dynasties.

Because the wooden lock was not strong enough and the confidentiality was not strong, it was later made of bronze, but the initial structure was simple and easy to open. In the Han Dynasty, the copper reed lock commonly known as the three spring lock appeared, which can be said to be a qualitative leap in the development history of locks in China, and its confidentiality and security have been strengthened. The three spring lock has been used in China until the 1950s.

In the 8th century AD, the ancient Romans made the leaf lock of the beginning; In the 18th century, the cam rotor lock, which was improved and created by the British danick Porter by the blade lock, is still used today; In 1860, Yale successfully developed the bullet structure lock, and its confidentiality exceeded that of the blade lock.

Three spring lock is an old lock with three springs. It is stronger than the general two spring lock. China's traditional lock appeared earlier in the Han Dynasty and withdrew from the historical stage in the middle of the 20th century. Three spring lock mainly uses two or three plate-shaped copper plates to seal and open. The key hole can be made into different shapes, and different keys can be made accordingly. The keys have changed more, the confidentiality has been strengthened, and the scope of use is also wider, which is known as "wide lock". After the Tang Dynasty, three spring locks were continuously improved and perfected, and more than 100 types of styles appeared. Some locks also adopted techniques such as secret door, orientation, second opening and text code, which further increased the difficulty of opening the lock. "Ancient and modern novels: the fourth Duke of the Song Dynasty made a scene of soul prohibition": "when [the fourth Duke of the Song Dynasty] went to the Turkmen door, he saw an arm with a big three spring lock to lock the Turkmen door."

Article source: Zhongshan mechanical lock manufacturerhttp://www.zshaochangsheng.com/