PICKING PREVENTIVE TOOL (PICKING GUARD) FOR CYLINDER LOCK

摘要

PROBLEM TO BE SOLVED: To provide a picking preventive tool for a cylinder lock which is hardly unlocked, simple in structure, and low in cost.;SOLUTION: The picking preventive tool (picking guard) prevents picking by fitting a cylindrical unlocking preventive tool 1 to a cylinder lock arranged inside a door, and fixing an unlocking thumb-turn into a slot 3, to thereby prevent the rotation of the thumb-turn. Then a door knob is completely covered and concealed outside a door, to thereby completely disable picking with respect to a keyhole from the outside of the door.;COPYRIGHT: (C)2004,JPO&NCIPI