Introduction to the security door chain
In the construction industry or the lock industry, the anti-theft door chain, also known as the anti-theft chain or the anti-theft chain, is a locked metal chain installed inside the door. It consists of a sliding chain and a clasp.
The role of the security door chain
The chain buckle is installed on the back of the door not far from the door. One end of the chain is fixed on the door frame, and the other end is movable. It can be inserted into the buckle on the back of the door to lock. When the anti-theft chain is hung, the door can only be opened to a maximum of 5~8 cm. People can't pass it. The hand can't reach the cufflinks at the back of the door. This ensures that the owner can open the door to confirm the visit. When they are identifiable, they will not be attacked by the other party. Since the slide chain is easily cut off by tools such as metal cutting pliers, the anti-theft door chain is rarely used as a door lock alone, but is used as an auxiliary tool for theft prevention. Therefore, the sliding chain type anti-theft door chain is also called "intentional lock", which is intended to remind people to be extra careful, just in case. There is also a "safety door" that replaces the metal chain with a metal rod, and is also designed and used for the same consideration.
Editor in charge: Li Hui
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