Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-07-12
1985-08-13
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340531, 340539, G08B 1302
Patent
active
045353247
ABSTRACT:
An alarm activator in the form of a ring-transmitter can be squeezed readily to activate an alarm by either ultrasonic or radio or infrared waves. The ring consists of either an ultrasonic or radio or infrared transmitter in a casing welded on an incomplete ring. Inside the casing is located a power source, a time delay circuit, an oscillator, a timer and either an ultrasonic or radio or infrared transducer. The tips of the incomplete ring are provided with two conductors, e.g. silver plates, one on each tip, forming a normally open contact. An all-around clearance is provided between the casing and the ring to permit the compression of the ring without interference from the casing to close the normally open contact and to permit current to flow from the power source through the time delay, energizing the timer which in turn will turn on the oscillator for a short time. The oscillator energizes the transducer which generates either ultrasonic, radio or infrared waves, and upon reaching a receiver an alarm will be initiated.
REFERENCES:
patent: 2516180 (1950-07-01), Brown
patent: 3825833 (1974-07-01), Bogue et al.
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