Padlock with tamper alarm

Details Padlock with tamper alarm Padlock with tamper alarm

1983-08-18

1985-12-03

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

70439, E05B 4506

Patent

active

045568723

ABSTRACT:
A padlock contains a battery connected by electrical circuitry and switches to an alarm sounding device which sounds an alarm when someone attempts to force open or sever the lock shackle or when someone attempts to remove the battery in an unauthorized manner. A test signal of momentary duration is automatically sounded each time the lock is opened or closed in an authorized manner, and this indicates whether the alarm system is operative.

REFERENCES:
patent: 3755778 (1973-08-01), Kennedy et al.
patent: 3824540 (1974-04-01), Smith, II
patent: 3879721 (1975-04-01), Yereance
patent: 3993987 (1976-11-01), Stevens
patent: 4092641 (1978-05-01), Bellinghausen et al.
patent: 4151506 (1979-04-01), Schoenmetz

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