Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1989-01-24
1990-05-01
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340562, 200DIG2, 307116, 307308, 328 5, G08B 2300, H01H 3500
Patent
active
049222279
ABSTRACT:
A touch-controlled switch and alarm system for protecting electrically conductive objects. The touch switch automatically adjusts itself within a few seconds to a wide range of ungrounded conductive objects, is not triggered by AC power line transients or failures, has a back-up battery for operation during power failures, and is automatically triggered if the power plug is disconnected. A unique underdamped automatic gain control circuit allows a simple unidirectional trigger to sense both increases and decreases of capacitance to ground. The alarm includes a lock switch for arming and disarming the alarm, and status indicators to show whether or not the system has been armed or triggered. The lock switch itself is protected by the alarm system because the lock switch has an electrically conductive body which is connected to the touch switch along with the protected objects.
REFERENCES:
patent: 3691549 (1972-09-01), Wilson
patent: 3978478 (1976-08-01), Schmitz
patent: 4037221 (1977-07-01), Alexander
patent: 4081700 (1978-03-01), Hamilton, II
patent: 4287513 (1981-09-01), Lam et al.
patent: 4295132 (1981-10-01), Burney et al.
patent: 4550310 (1985-10-01), Yamaguchi et al.
patent: 4668876 (1987-05-01), Skarman
patent: 4668877 (1987-05-01), Kunen
patent: 4831279 (1989-05-01), Ingraham
Bill Daniels Co., Inc., Bill Daniels Illustrated Trade References, Jan. 1987/87 Security, Anti-Terrorism and Loss Prevention Equipment and Devices Buyers Guide, vol. 1, pp. S-1, S-1056.
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