Apparatus for directional boring under mixed conditions

  • US RE44,427 E1
  • Filed: 01/20/2012
  • Issued: 08/13/2013
  • Est. Priority Date: 03/03/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus, for use in horizontal directional drilling in compressible soil, non-compressible soil, or rock, of the type having a drill string coupled to a directional boring machine at a proximal end and a drill head coupled to the drill string at a distal end of the drill string, comprising:

  • a drill bit generally adapted and configured to bore through rock;

    a device for determining the angular orientation of the drill bit and for providing a generated signal corresponding to the orientation; and

    an offset coupling member attached at a first end to the drill string and at a second end to the drill bit, the offset coupling member angularly offsetting the drill head from a longitudinal axis of the drill string, wherein, the offset coupling member is oriented in response to the generated signals to steer the drill bit;

    wherein the drill bit further comprises an effective steering geometry suitable for steering the drill bit.

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