PROBLEM TO BE SOLVED: To provide a cylinder lock to which illegal picking is very difficult to perform.;SOLUTION: A recessed pit portion 16 is formed to a division plate 14; in this recessed pit portion 16, respective end portion is borne in a rotatable manner in a plane parallel to the division plate, a pair of tabular shutters 17 and 17 capable of covering almost one-half of a key hole 5 in width direction by the free end portion are provided at the other end, these pair of shutters are respectively energized in a direction thereon the ends of free ends come closer to each other, meanwhile, portions mutually pushing the free ends of the pair of shutters are diagonally sliced and a pair of sliding and contacting end edges 22 and 22 are formed, and the position of the up-down direction of these sliding contact end edges is set in such a manner that the tip of a duplicate key 5 inserted can move forward during locking and unlocking operations.;COPYRIGHT: (C)2003,JPO
展开▼
