Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-09-29
1985-12-17
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340528, G08B 1308
Patent
active
045595275
ABSTRACT:
A dual mode electronic intrusion or burglar alarm system for use with a door or window which can be opened and closed comprises a switch actuatable by the door or window, a control circuit, including time delay circuitry, operatively connected to the switch and responsive to switch actuation to operate in either of two modes, and an alarm connected to be operated by the control circuit. When the system is in operation and armed in a first mode, initial actuation of the switch in response to opening of the door or window causes the control circuit to actuate the alarm for a first predetermined interval of time, then to shut off the alarm and arm itself in a second mode wherein subsequent actuation of the switch in response to closing of the door or window causes the control circuit to again actuate the alarm for a second predetermined interval of time. The system can be reset for operation in the first mode either during the first interval of time, or at any time thereafter, i.e., during the time it is armed in the second mode, or during the second interval of time. The system aims to trap, or at least further discourage, an intruder who observes or counts on the fact that the first actuation of the alarm fails to evoke an appropriate security response and returns to complete the intrusion and closes the door or window after entry to provide the appearance of normality.
REFERENCES:
patent: 3662372 (1972-05-01), Levy
patent: 3866201 (1975-02-01), Beiswenger
Rowland James L.
Tumm Brian R.
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