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Ward or Warded locks must turn a key through channels (called wards); a “skeleton key” is designed to open varieties of warded locks.

A spring-bolt lock, shown in Fig. 4.35, is a locking mechanism that “springs” in and out of the doorjamb; the door may be closed with the spring bolt exposed. A deadbolt is rigid; the door cannot be closed when the deadbolt is locked. Both types of bolts extend into the strike plate in the doorjamb.

Fig. 4.35 A deadbolt and spring-bolt lock.