Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-04-15
1990-02-13
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
70211, 70439, E05B 4506
Patent
active
049010573
ABSTRACT:
A device for securing a combination dial lock is comprised of a base member, a bridge member, which is pivotally mounted on the base member, and a cover member which substantially envelopes both the base member and the bridge member. The bridge member includes a pin member projecting from a tip thereof for being inserted in a complementary opening in the combination dial to secure the dial against rotation. Tamper alarm circuitry is provided to generate a tamper alarm signal if an attempt is made to tamper with the combination dial or to damage the device. An alarm will also be generated if the lock remains in an unsecure state for more than a predetermined time interval, which is deemed adequate for an authorized user to conduct legitimate business in the compartment which is being protected by the combination dial lock. When both the protected compartment and the combination lock are properly secured, an electrical signal indicative thereof will be transmitted to the host controller and a visual display will inform the user that the lock has been properly secured. Means is provided for ensuring that the dial is rotated a prescribed number of times in a predetermined direction after the lock is returned to a "locked" state in order to properly "spin off" the combination.
REFERENCES:
patent: 2923928 (1960-02-01), McLaughlin
patent: 3723682 (1973-03-01), Pecott
patent: 3967846 (1976-07-01), Schlage
patent: 3971240 (1976-07-01), Love, Sr.
patent: 4085600 (1978-04-01), Bindari
patent: 4772877 (1988-09-01), Rice, Jr. et al.
McCord W. Kirk
Mullen Jr. Thomas J.
Swann III Glen R.
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