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Title:
LOCKING MANIPULATION DETECTOR
Document Type and Number:
Japanese Patent JP3821505
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To securely transmit detected signals transmitted in the same frequency to an alarm controller, by transmitting radio signals of a plurality of sensors in a time division system, in a detector against incorrect manipulation in a locking device of an opening like a window.
SOLUTION: A lock transmitter 11 closely arranged at a crescent lock 10 detects a shock given to the crescent lock 10 by a shock sensor 17 and detects the unlocking of the crescent lock 10 by a lead switch 18 to transmit the detected signal to alarm control device through a transmitting drive circuit 19 and an antenna 20. The transmitting drive circuit 19 is provided with a setting and storing means of code signals of respective transmitters 11 and a timer deciding the transmitting time pitch to transmit detected signals including code signals in a different time pitch in every transmitter 11 to the alarm controller, at the same frequency. Accordingly, the alarm controller can securely receive detected signals from a plurality of transmitters 11.


Inventors:
Toshiya Kato
Hiroto
Application Number:
JP32200395A
Publication Date:
September 13, 2006
Filing Date:
December 11, 1995
Export Citation:
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Assignee:
Tostem Corporation
Alpha Co., Ltd.
International Classes:
E05B41/00; E05B45/06; G08B13/06; H04Q9/00; (IPC1-7): E05B45/06; E05B41/00; G08B13/06; H04Q9/00; H04Q9/00
Domestic Patent References:
JP57206995A
JP7119338A
JP4218449A
JP7006284A
JP4133538A
JP5136867A
Attorney, Agent or Firm:
Keiichi Shimizu
Akira Gotoda