Paving machine having automatic metering screed control

Details Paving machine having automatic metering screed control Paving machine having automatic metering screed control

1995-06-06

1996-12-31

Lisehora, James A.

Road structure, process, or apparatus

Process

404 841, 404 845, 404101, E01K 1918

Patent

active

055887767

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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Article entitled "Electronic Control Develops Positive Traction" by Richard T. Schneider, Sep. 1992, Hydraulics & Pneumatics, p. 10.

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