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Backreamer

  • US 6,668,946 B2
  • Filed: 01/22/2002
  • Issued: 12/30/2003
  • Est. Priority Date: 01/22/2001
  • Status: Expired due to Term
First Claim
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1. A steerable reamer for use in horizontal directional drilling using a drill string, the reamer comprising:

  • a rotatable drive shaft;

    a cutting body having a reaming surface oriented to dig upon rotation of the drive shaft while the reamer is pulled by the drill string;

    a frame rotatably coupled to the cutting body;

    a housing having proximal and distal ends, the housing being tiltably coupled to the frame; and

    an extendable arm coupled to both the frame and the housing so that by operation of the extendable arm the frame and thus the cutting body may be tilted relative to the housing.

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