Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1991-09-19
1993-03-16
Ng, Jin F.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
280 33994, 180167, B60T 716
Patent
active
051948443
ABSTRACT:
A theft prevention system for vehicles such as shopping carts that are intended to be used within a prescribed area include a current conductor that is embedded proximate a perimeter of the prescibed area, this conductor being driven by an asymmetrical periodic waveform for producing a magnetic field. Each vehicle is equipped with a receiver circuit for operating a wheel mechanism. The mechanism is operable between a locked position and an unlocked position by a motor. The mechanism is automatically restored to an unlocked condition by movement of the vehicle returning it to within the prescribed area. A buzzer also provides a warning sound when the vehicle is taken from the prescribed area, the system further including an array of microphones that are connected into a circuit that provides an alarm when a vehicle is about to be removed from the prescribed area, an alarm signal component further indicating the approximate location of the offending vehicle.
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Ng Jin F.
Tumm Brian R.
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