Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
1987-05-14
1988-09-27
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
175413, E21B 1026
Patent
active
047734914
ABSTRACT:
A drill head assembly especially adapted but not limited to horizontal drilling with placement of casing is illustrated as including a drill head body, a wing cutter assembly, and a drive shank all having interlocking connections and assembled by a longitudinal assembly screw.
REFERENCES:
patent: 2101864 (1937-12-01), McCallum
patent: 2770449 (1956-11-01), McCarthy
patent: 2886292 (1959-05-01), Petersen
patent: 2990896 (1961-07-01), Kandle
patent: 4380271 (1983-04-01), Baker et al.
patent: 4632195 (1986-12-01), Emmerich
Neuder William P.
Novosad Stephen J.
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