Roller cutter with major and minor insert rows

Details Roller cutter with major and minor insert rows Roller cutter with major and minor insert rows

1979-01-11

1980-05-13

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175376, 175410, E21B 935

Patent

active

042024196

ABSTRACT:
An earth boring system is provided with universal cutter means for boring in all types of formations. The cutter means is mounted on a drill bit body or cutterhead with said bit or cutterhead functioning to form a hole in the earth formations. At least two annular rows of major inserts are mounted in the cutter means. The major inserts project from the surface of the cutter means a substantial distance for forming circular kerfs in the earth formations being bored. An annular row of minor inserts are mounted in the cutter means between the two annular rows of major inserts. The minor inserts project from the surface of the cutter means a distance that is substantially less than the distance the major inserts project from the surface of the cutter means.

REFERENCES:
patent: 3126067 (1964-03-01), Schumacher, Jr.
patent: 3306669 (1967-02-01), Christensen et al.
patent: 3398989 (1968-08-01), Christensen
patent: 3726350 (1973-04-01), Pessier
patent: 3858670 (1975-01-01), Ott et al.
patent: 3952815 (1976-04-01), Dysart

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