| 摘要 |
PROBLEM TO BE SOLVED: To provide a thumb-turn capable of effectively preventing an unjust unlocking operation to a knob by inserting a special tool into a gap of a door from an outdoor side for the thumb-turn operating a dead bolt in a lock of the door from an indoor side. SOLUTION: In the thumb-turn provided to the indoor side of the door and moving the dead bolt by a rotational operation of the knob, the thumb-turn can operate the operation of the knob 1 by two steps. COPYRIGHT: (C)2003,JPO
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