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Patent Searching and Data


Title:
CYLINDER LOCK
Document Type and Number:
Japanese Patent JP2002332761
Kind Code:
A
Abstract:

To provide a cylinder lock capable of detecting pickings besides preventing the illicit operation of a key, particularly the damage of pickings.

The position of a picking preventive pin a2 or a3 is confirmed during the rotation of an inner cylinder 100, and when illicit key operation is performed, the rotation of the inner cylinder 100 is stopped halfway. Since a sensor s1 or s2 can detect illicit unlocking as the position change of the picking preventive pin a2 or a3, the safety of the cylinder lock can be further improved in combination with various alarm systems.


Inventors:
HADEYAMA YOSHIHIKO
Application Number:
JP2001000138390
Publication Date:
November 22, 2002
Filing Date:
May 09, 2001
Export Citation:
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Assignee:
NEC CORP
International Classes:
E05B15/00; E05B45/08; (IPC1-7): E05B15/00; E05B45/08
Attorney, Agent or Firm:
畑 泰之