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Transducer arrangement for screed control

  • US 6,530,720 B1
  • Filed: 01/27/2000
  • Issued: 03/11/2003
  • Est. Priority Date: 01/27/1999
  • Status: Expired due to Term
First Claim
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1. A method of controlling elevational positions of hydraulically controlled ends of a screed head in relationship to a reference plane, defined by a laser transmitter and detected by laser receivers attached the end of the screed head, in a column block situation that interrupts the reception of a laser beam from the laser transmitter by one of the laser receivers, comprising the steps of:

  • (a) emitting light from a light source mounted on a first mast of the screed head;

    (b) detecting said light with a light detection device mounted on a second mast of the screed head, said light detection device includes a plurality of light detectors arranged in a vertical row;

    (c) generating an output indicating which of said plurality of light detectors is illuminated by light from said light source; and

    (d) using said output of said light detection device to maintain a relative height between said first and second mast until the column block situation clears.

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