Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1994-08-30
1995-09-26
Schoeppel, Roger J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175339, 761084, 29DIG18, E21B 1008
Patent
active
054527708
ABSTRACT:
A method of manufacturing a roller cone type drill bit, or main body thereof, includes forging a monolithic main body forging comprising a shank blank extending longitudinally at one end and a plurality of circumferentially spaced leg stubs at the other end; turning the shank blank to form a threaded section; rotatably mounting a respective roller cone on each of a plurality of journal members, each journal member being carried at one end of a respective leg extension; and welding a respective one of the leg extensions to each of the leg stubs. The main body is forged with its longitudinal centerline perpendicular to its flash line, the latter being located well inward of the leg end of the forging. The radially outer surface of each leg stub is forged to taper radially inwardly from the flash line to the outer end of the leg stub, and subsequently machined to remove the taper, resulting in a radially outer surface of each leg stub circumferentially wider in the vicinity of the former flash line than at its outer end.
REFERENCES:
patent: 4187743 (1980-02-01), Thomas
patent: 4570725 (1986-02-01), Matthias et al.
patent: 4605157 (1986-08-01), Barr et al.
patent: 4694551 (1987-09-01), Mathews
patent: 4711143 (1987-12-01), Loukanis et al.
patent: 4711144 (1987-12-01), Barr et al.
Briscoe Tool Company
Schoeppel Roger J.
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