Paving machine having automatic metering screed control
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United States of America Patent
Stats
-
Dec 31, 1996
Issued Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Jan 21, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A paving machine having a sensor-controlled concrete metering screed. The machine includes hydraulic cylinders which move the metering screed to various elevations to control the depth of concrete being metered out by the screed. At least one ultrasonic sensor is slide-mounted to the machine above and behind the metering screed to provide measurements of the distance between the sensor and the surface of the concrete just behind the screed. A control system compares the sensor measurements with a tolerance range of distances corresponding to the desired depth of concrete. When the sensor measurements are out of tolerance, the control system moves the metering screed up or down to bring the distance, and the metered depth of concrete, back within tolerance.
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