Communications: electrical – Selective – Having indication or alarm
Patent
1982-08-24
1987-12-01
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
340 64, 340 81R, 340332, 307 10AT, B60R 2500, B60R 2504, B60Q 146
Patent
active
047107456
ABSTRACT:
A psychologically sound automobile protection system designed to give a warning of electrical activity to anyone who enters the immediate region of the doors, windows or other openings of a vehicle. The system consumes so little energy when in operation that it is electrically connected to operate at all times when the ignition of the vehicle is off. The indicators are of such small size that they are hardly visible visible to anyone except those in the immediate region of the vehicle and particularly to those who might consider an unauthorized entry of the vehicle. The system includes a relay or other switching device which is connected to the battery or main power supply of the vehicle via the ignition switch whereby the relay or switching device is activated to apply power from the battery to the system when the ignition switch is off. Power is applied to a periodic circuit such as multivibrator which is connected to drive a flashing signalling device. The signalling device is preferably a red light emitting diode (LED). The signalling device and the periodic circuit produce very little current drain when in operation. The switching device, such as a relay is connected to the system to draw little or no current when the signal is operating, i.e. the ignition is OFF.
REFERENCES:
patent: 1856391 (1929-08-01), Keppler
patent: 3299402 (1967-01-01), Schilling
patent: 3432808 (1969-03-01), Fleece
patent: 3493924 (1970-02-01), Dobbins
Ljungfeldt, "Car Theft Alarm", Practical Electronics, vol. 17, No. 7, Jul. 1981.
Edwards, "LED Flasher on Inexpensive IC", Electronics Australia, vol. 37, No. 4, Jul. 1975.
Schoolderman, "Simple Burglar Alarm", Radio Elektronics, vol. 28, No. 6, Mar. 1980.
Caldwell Sr. John W.
Queen Tyrone
Wagner John E.
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