| 摘要 |
PROBLEM TO BE SOLVED: To prevent criminal unlock done by inserting a wire from a cylinder insertion hole opened on the external face of a door. SOLUTION: A blockage device has a first blockage member 12 having a shallow cup-shape fitted in the cylinder insertion hole and forming a cylinder opening fitted to the cylinder 2 at the bottom face and fitted in the cylinder insertion hole with a flange at the outside, and a circular second blockage member 16 arranged at the outside of the first blockage member and fitted to the cylinder. These first and second blockage members are widened respectively and fitted in the cylinder. COPYRIGHT: (C)2004,JPO
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