Communications: electrical – Selective – Having indication or alarm
Patent
1978-05-17
1980-11-04
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
340 32, 340 38L, 324237, 180271, G08G 116, G01N 2782
Patent
active
042322863
ABSTRACT:
Apparatus mounted on a vehicle is arranged to provide a signal indicative of the spacing between the vehicle and a metal article being less than a predetermined amount, the predetermined amount being small compared with the length of the vehicle. The apparatus in combination with the vehicle comprises a plurality of sensor units mounted externally of the vehicle and each comprising a coil, the sensor units being arranged electrically in parallel to each other. A respective oscillator circuit is coupled to each coil to generate a respective electromagnetic field, and to provide an output signal in response to any disturbance of a respective one of the electromagnetic fields as a result of the spacing between the vehicle and the metal article being less than the predetermined amount. Regulating circuits are each arranged to receive the output signal provided by a respective oscillator circuit and to compensate the disturbance of the electromagnetic field after a predetermined delay in response to the output signal. Evaluating circuits are each arranged to receive the output signal provided by a respective oscillator circuit. A spacing indicating circuit is mounted internally of the vehicle. A single connector electrically connects the parallel arrangement of the sensor units to the indicating circuit, the evaluating circuits being arranged in response to the output signal to cause an electrical signal to be applied to the connector.
REFERENCES:
patent: 3355707 (1967-11-01), Koerner
patent: 3366925 (1968-01-01), Aubert et al.
patent: 3437988 (1969-04-01), Vachon et al.
patent: 3685013 (1972-08-01), Brickner
patent: 3688186 (1972-08-01), Judd
patent: 3732536 (1973-05-01), Larka et al.
patent: 3775742 (1973-11-01), Koerner et al.
patent: 4015232 (1977-03-01), Sindle
Caldwell Sr. John W.
Crosland Donnie L.
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