Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1978-04-17
1980-11-18
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340510, 340515, 340292, G08B 2900
Patent
active
042348730
ABSTRACT:
An alarm system includes a number of self powered indicating elements each with an integral warning device. Each indicating element includes a control circuit which may comprise a transistor switching circuit, transistor oscillator or part of a wheatstone bridge circuit for example. Each of these control circuits is connected via two lines to a common control element at a position remote from the remainder of the control circuit, such element comprising for example a resistor, a battery or a zener diode dependent on the type of control circuit utilized. A switch is also included to provide, on actuation, either a short circuit or open circuit condition between the two lines. Actuation of this switch or tampering with the lines so as to cause a short circuit or open circuit condition to occur will result in operation of the alarm.
REFERENCES:
patent: 1084059 (1914-01-01), Beach
patent: 3060416 (1962-10-01), Brown
patent: 3135951 (1964-06-01), Byrne
patent: 3461443 (1969-08-01), Vasel
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3764971 (1973-10-01), Brobeck
Klaxon S.A.
Swann III Glen R.
Wray James C.
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