Road structure – process – or apparatus – Apparatus – Material distribution means
Patent
1991-07-30
1993-04-13
Britts, Ramon S.
Road structure, process, or apparatus
Apparatus
Material distribution means
404 845, E01C 1918
Patent
active
052016048
ABSTRACT:
A sonic grade control device for maintaining a leveling instrument of a paver at a constant distance from a datum. The device transmits and receives a sonic signal to provide first and second time periods corresponding to the round trip travel time of a sonic signal to the datum and a target, respectively. A distance indicating signal, corresponding to the distance between the control device and the datum, is provided in response to the first and second time periods and a stored target distance, such target distance corresponding to the distance between the control device and the target. The grade control device includes an operator actuable control for modifying the stored target distance to calibrate the control device. A reference signal is compared to the distance indicating signal to provide a control signal. The reference signal is adjustable by a predetermined increment and the control device includes an operator actuable control for modifying the predetermined increment. The position of the leveling instrument is changed in response to the control signal being greater than a predetermined, or deadband value. The control device includes a display for indicating such predetermined value and an operator actuable control for modifying such value.
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Ferguson Christopher
Musil Joseph E.
Britts Ramon S.
Clark William R.
Connolly Nancy P.
Raytheon Company
Sharkansky Richard M.
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