Horizontal boring apparatus and method of using the same

Details Horizontal boring apparatus and method of using the same Horizontal boring apparatus and method of using the same

1998-02-04

1999-11-09

Bagnell, David

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175367, E21B 1010

Patent

active

059795743

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.

REFERENCES:
patent: 3833077 (1974-09-01), Lavallee
patent: 3894402 (1975-07-01), Cherrington
patent: 3902563 (1975-09-01), Dunn
patent: 3905431 (1975-09-01), Hasewend
patent: 3917011 (1975-11-01), Hester
patent: 4043136 (1977-08-01), Cherrington
patent: 4117895 (1978-10-01), Ward et al.
patent: 4248314 (1981-02-01), Cunningham et al.
patent: 4319648 (1982-03-01), Cherrington
patent: 5314267 (1994-05-01), Osadchuk
"Trenchless Technology Special Product Focus", Utility Construction & Maintenance, Jun./Jul., 1992. p. 29.

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