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Patent Searching and Data


Title:
DOOR UNLOCK ALARM DEVICE
Document Type and Number:
Japanese Patent JP2002327561
Kind Code:
A
Abstract:

To issue an alarm during unlocking operation by promptly detecting the operation of unlocking a door illicitly from the outside.

A grooved rotor 2h for engagement with a thumb turn 1d is built into an alarm device case which is fitted over a door knob 1b. A switch 2g for comparing the rotational angle of the rotor 2h to the rotational angle of the door knob or that of a door fixing part to detect a difference between the angles is provided inside the case. A circuit and an alarm for issuing warning when the switch 2g detects a difference in angle that is equal to or greater than a set value are incorporated into the case.


Inventors:
TSUKASAKI FUMIO
Application Number:
JP2001000171772
Publication Date:
November 15, 2002
Filing Date:
May 01, 2001
Export Citation:
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Assignee:
TSUKASAKI FUMIO
CYGNUS KK
International Classes:
E05B45/14; G08B15/00; (IPC1-7): E05B45/14; G08B15/00