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Method and apparatus for drill bit location

  • US 5,031,158 A
  • Filed: 03/23/1984
  • Issued: 07/09/1991
  • Est. Priority Date: 03/23/1984
  • Status: Expired due to Fees
First Claim
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1. For use with an elongated member adapted for hole boring and having an end disposed in elastic wave transmitting relation with a surrounding material, apparatus for precisely determining the location of said end comprising:

  • said member comprising a tool having an end adapted for cutting said surrounding material;

    means operative to induce elastic waves in said member at a location remote from said cutting end upon electrical energization of said means;

    said member itself transmitting the elastic waves from the remote location to the cutting end;

    means for coupling elastic waves induced in said member through said end to the surrounding material;

    a plurality of sensors disposed in elastic wave transmitting relation with said surrounding material, each of said sensors operative to produce an output signal representative of received elastic waves;

    means for processing the output signals from the received elastic waves.

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