Inside the hotel door lock called what lock
Brief introduction of anti - theft door chain
In the construction industry or lock industry, anti-theft door chain, also known as anti-theft chain or anti-theft chain, is installed in the door inside the lock chain metal chain. It consists of two parts: the chain and the chain.
As the chain is easy to metal cutting pliers and other tools forcibly cut off, so the anti-theft door chain is rarely used as a separate lock, but as an anti-theft auxiliary tool to use. Therefore, the sliding chain sliding door is also known as the "heart lock", intended to remind people to be careful, just in case. There is also a metal rod instead of metal chain "security door buckle", in the design and use is also out of the same considerations.
Chain buckle installed in the back of the door from the door near the place, one end of the chain chain fixed on the door frame, the other end is active, can be inserted into the back of the chain buckle lock. When the anti-theft chain, the door can only open to the maximum of 5 to 8 cm, people can not pass, the hand can not be reached from the door enough to the back of the chain buckle, which ensures that the owner in the door to confirm the visit When the identity, will not be the other side of the sudden attack.
