Horizontal boring apparatus and method of using the same
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United States of America Patent
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-
Nov 9, 1999
Issued Date -
N/A
app pub date -
Feb 4, 1998
filing date -
May 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A boring head is provided for use in mounting to a drill pipe of a drilling rig for enlarging a pilot bore in horizontal boring operations. The boring head has an axial member positioned along a central axis of the boring head for connecting the boring head to the drill pipe of the drilling rig. A plurality of internally tapered longitudinal pockets around the periphery of the axial member each receive an externally tapered body mounting an independently rotatable cutter bit which rotates about a rolling axis inclined at an angle in the range between ten and eighty degrees with respect to the central axis of the boring head. The tapered body is drawn into the tapered pocket by a threaded retainer and forced into the pocket when boring by the force of the boring head against the bore face.
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