Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1978-02-13
1982-06-15
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340545, 340547, 138 96R, 206328, 220284, 455 67, 455128, G08B 108, G08B 1308
Patent
active
043353754
ABSTRACT:
A container for an alarm transmitter used in combination with components of a transmitter circuitry which includes voltage control for providing a gated voltage and controlled by a timing circuit. The components also include an audio multivibrator which is electrically coupled to the voltage control in order to receive the gated voltage, a microfork audio filter which is electrically coupled to the audio multivibrator and a modulator which is electrically coupled to the audio multivibrator. The components further include a radio frequency oscillator whose frequency is modulated by the modulator and which has an antenna electrically coupled to its output terminal. The container includes a tubular member which is adapted to be installed into a hole in a wall adjacent to a door or a window and an elongated, rectangular member adapted to be inserted into the tubular member and also adapted to have the components of the transmitter circuitry placed thereon. The container also includes a battery, which has one of its lead electrically coupled to the voltage control and electrical-coupling device for electrically coupling the other lead of the battery to the voltage control in order to complete the circuit. The electrical-coupling device includes a reed relay which is held normally open by a magnet which is placed in the adjacent door or window.
REFERENCES:
patent: 2995751 (1961-08-01), Bosch
patent: 3068415 (1962-12-01), Johnson
patent: 3108223 (1963-10-01), Hunter
patent: 3299356 (1967-01-01), Bornhorst et al.
patent: 3415086 (1968-12-01), Trainor
patent: 3641540 (1972-02-01), Cutler et al.
patent: 3718862 (1973-02-01), Norris
patent: 3725887 (1973-04-01), Sneider
patent: 3912116 (1975-10-01), Chahley
Caldwell Sr. John W.
Crosland Donnie Lee
Johansen W. Edward
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