Rotary drill bit

Details Rotary drill bit Rotary drill bit

1980-06-30

1982-04-13

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Cutting edge self-renewable during operation

175387, 175391, 175404, E21B 1026, E21B 1062, E21B 1004

Patent

active

043243002

ABSTRACT:
A drill bit including a support member and a plurality of concentrically positioned, hollow, cylindrical cutting members connected to the support member is disclosed. Each of the cutting members includes a beveled edge obliquely extending between the inner and outer surfaces thereof. The beveled edges are aligned so that a tapered cutting surface is defined.

REFERENCES:
patent: 1163867 (1915-12-01), Shaffer
patent: 1505460 (1924-08-01), Griesche
patent: 1572386 (1926-02-01), Gates
patent: 2203747 (1940-06-01), Sandstone
patent: 2262001 (1941-11-01), Hokanson
patent: 2342931 (1944-02-01), Fortune
patent: 2599770 (1952-06-01), Marcerou
patent: 2819043 (1958-01-01), Henderson
patent: 2830795 (1958-04-01), Center
patent: 2833520 (1958-05-01), Owen
patent: 2966949 (1961-01-01), Wepsala
patent: 3202035 (1965-08-01), Rosselet
patent: 3295617 (1967-01-01), Willis
patent: 3495359 (1970-02-01), Smith et al.
patent: 3696873 (1972-10-01), Anderson

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