Earth working – Processes
Patent
1990-01-09
1990-09-11
Reese, Randolph A.
Earth working
Processes
172 45, 172 4, 367 96, 37DIG1, E02F 920, A01B 63111
Patent
active
049554379
ABSTRACT:
A device for determining the depth below the ground surface of a working member of an earth moving equipment, comprises a sensor for transmitting electromagnetic signal from underneath and toward the ground surface and for receiving a portion of the signal reflected from the ground surface. The sensor is positioned underneath the ground surface in fixed spatial relationship to the working member such that the sensor means is under the ground surface when at least a portion of the working member is under the ground surface. A circuit is provided for processing the received reflected signal to thereby indicate the depth under the ground surface of the working member, whereby the depth is proportional to the time of travel of the signal to the ground surface and the reflected signal to the sensor means.
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patent: 4282933 (1981-08-01), Suganami et al.
patent: 4573124 (1986-02-01), Seiferling
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patent: 4657087 (1987-04-01), Livneh
patent: 4733355 (1988-03-01), Davidson et al.
patent: 4750117 (1988-06-01), Gregory
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Ford New Holland Inc.
Reese Randolph A.
Thompson Jeffrey L.
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