Communications: electrical – Land vehicle alarms or indicators – Of collision or contact with external object
Patent
1990-07-26
1993-05-11
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
Of collision or contact with external object
340426, 340433, 340903, 340561, 340552, B60Q 100
Patent
active
052105210
ABSTRACT:
A vehicle alarm for preventing injury to persons near the vehicle. Persons under and around a vehicle such as a school bus are detected by establishing an energy field and monitoring for disturbances therein. At least one transmitter establishes the energy field in areas of high risk. One or more receivers detect a signal resulting from the energy field. These signals are monitored by a processor unit for amplitude variations therein. The processor unit preferably stores the amplitude of the received signal when no persons are present and establishes one or more thresholds preferably in accordance with the stored amplitude. The received signal is subsequently monitored for variations that result in a threshold crossing indicating the unwanted presence of a person in a danger zone. When a threshold crossing is detected an alarm is activated.
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"The Purpose Of This Product Is Alarming", School Bus Fleet, pp. 41-47, Apr./May 1989.
Abilevitz Barry
Hojell Gary M.
Crosland Donnie L.
Diehl Glen M.
Hojell Gary M.
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