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warded lock
A warded lock (also called a ward lock) is a type of lock that uses a set of obstructions, or ''wards'', to prevent the lock from opening unless the correct key is inserted. The correct key has notches or slots corresponding to the obstructions in the lock, allowing it to rotate freely inside the lock. Large warded locks are still in use today in the UK and Ireland for internal and external doors though mainly in 'heritage' sites such as ancient monuments and churches to preserve original features, primary security being provided by other means. Warded locks in America are commonly used in inexpensive padlocks, cabinet locks, and other low-security applications, since a well-designed skeleton key can successfully open a wide variety of warded locks.
== History ==
The warded lock is one of the most ancient lock designs still in modern use. During the Middle Ages they were used prolifically on monasteries where, because money and time were not issues, their complexity grew. All had the same inherent problem: by removing most parts of the key, except the bare minimum to operate the bolt, and so producing a skeleton key, the wards could be bypassed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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