A door chain, security chain, or security door chain consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. ==Uses== Door chains are mainly intended to allow a person inside a structure to open the d...
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http://en.wikipedia.org/wiki/Door_chain
a short chain with a removable slide fitting that can be attached between the inside of a door and the doorjamb to prevent the door from being opened more than a few inches without the chain being removed.
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https://www.infoplease.com/dictionary/door-chain
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