Rotary drill bit

Details Rotary drill bit Rotary drill bit

1979-02-23

1980-10-28

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Cutting edge self-renewable during operation

175336, E21B 912

Patent

active

042301947

ABSTRACT:
An improved rotary drill bit comprised of two or more elongated generally cylindrical drill members, the lower ends of which form a cutting face. A plurality of vertically spaced rows of rotatable cutting members are positioned around and between the drill members and are journaled thereto whereby as the lowermost row of the rotatable cutting members and the lower ends of the drill members wear away, the next adjacent row of cutting members is exposed.

REFERENCES:
patent: 1163867 (1915-12-01), Shaffer
patent: 1505460 (1924-08-01), Grlesche
patent: 1572386 (1926-02-01), Gates
patent: 1731262 (1929-10-01), Phipps
patent: 1987853 (1935-01-01), Howard et al.
patent: 2203747 (1940-06-01), Sandstone
patent: 2342931 (1944-02-01), Fortune
patent: 2830795 (1958-04-01), Center, Jr.
patent: 2833520 (1958-04-01), Owen
patent: 2966949 (1961-01-01), Wepsala, Jr.
patent: 3055443 (1962-09-01), Edwards
patent: 3295617 (1967-01-01), Willis
patent: 3495359 (1970-02-01), Smith et al.

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