| 摘要 |
PROBLEM TO BE SOLVED: To provide such a door lock that a thumb turn mounted in the indoor side of a lock case cannot be turned to the unlocking direction and preventing unfair unlocking action, even by a thumb turn tool, by prohibiting a through hole from the outdoor side to the indoor side from being formed in the vicinity of the door lock by a drill. SOLUTION: A card plate 30 making it possible to form a drilled hole due to a slanting posture caused by the pushing force of a drill is provided at the peripheral part of the lock case 1. To be concrete, the card plate 30 is integrally provided with the lock case 1 for instance, or integrally installed with the lock except the lock case such as a cylinder 10, a thumb turn 20, a round seat, etc. or integrally provided together with the door. COPYRIGHT: (C)2004,JPO&NCIPI
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