| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel door key for prevention of picking which is favorable as a countermeasure against picking, while in many of conventional door keys a lock is generally located near a doorknob and a door is opened or closed by insertion of a key into a keyhole, which has a defect of being apt to be picked, and so these years an entrance door, which is only opened or closed by a holder of such an IC card as an electronic lock, is also used. SOLUTION: The concept involved is different from the conventional entrance door in a sense that at least two or more key shanks are engaged with and fitted to lock receiving seats at the same time at positions which are not near the doorknob. The positions of the key shanks are determined so that they may not be recognized from the outside. COPYRIGHT: (C)2004,JPO&NCIPI
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