Title:
LOCK DEVICE WITH ELECTRONIC ALARM
Document Type and Number:
Japanese Patent JPS5664071
Kind Code:
A
Abstract:
A standard mechanical lock is provided with an electrical coding system for setting off an alarm in the event that an incorrect key is used or the lock is tampered with. The electrical coding system includes a binary code inscribed in the back edge of the key. A plurality of conductive fingers are mounted on the lock body to contact the back of the key when the key is rotated in the lock. A decoding circuit is provided which sounds an alarm in the event that an incorrect code is presented to the fingers. In the event that an attempt is made to pick the lock, one or more of the fingers will become grounded thus setting off the alarm. Automotive and building applications are disclosed wherein microswitch sensors are placed at strategic locations to set off the alarm in the event that an attempt is made to circumvent the mechanical lock.
Inventors:
FURANKURIN JIEEMUZU MAATEIN
Application Number:
JP14375180A
Publication Date:
June 01, 1981
Filing Date:
October 16, 1980
Export Citation:
Assignee:
MARTIN FRANKLIN JAMES
International Classes:
E05B45/10; E05B45/14; E05B49/00; G08B13/00; G08B13/08; (IPC1-7): E05B45/10