Cutting elements for roller cutter drill bits

Details Cutting elements for roller cutter drill bits Cutting elements for roller cutter drill bits

1989-04-05

1990-07-10

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175378, 175408, 175410, E21B 1016, E21B 1050

Patent

active

049400991

ABSTRACT:
A rotary drill bit (10) having a plurality of roller cutters (20) with rows (32A, 32B, 32C, 32D) of cutting inserts (34,36,38,40) mounted within sockets (35,46) on the frusto-conical cutter body (30). The cutting inserts 34,36,38,40) have cutting surfaces formed with a wear-resistant material with certain cutting inserts (36,38) being formed of a wear-resistant material having a hardness higher than the hardness of the wear-resistant material on the remaining inserts (34,40) in each row. The hard cutting inserts (36,38) are positioned in each row in a predetermined pattern intermingled in a generally uniformly spaced pattern with the softer cutting inserts (34,40) and comprising generally between 20% and 50% of the total number of cutting inserts in a particular row.

REFERENCES:
patent: 2027700 (1936-01-01), Rogatz
patent: 2804282 (1957-08-01), Spengler, Jr.
patent: 3126067 (1964-03-01), Schumacher, Jr.
patent: 3311181 (1967-03-01), Fowler
patent: 4444281 (1984-04-01), Schumacher, Jr. et al.
patent: 4512426 (1985-04-01), Bidegaray
patent: 4602691 (1986-07-01), Weaver
patent: 4690228 (1987-09-01), Voelz et al.
patent: 4694918 (1987-09-01), Hall
patent: 4705124 (1987-11-01), Abrahamson et al.
patent: 4722405 (1988-02-01), Langford, Jr.

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