Rotary drill bit

Details Rotary drill bit Rotary drill bit

1978-12-15

1980-10-28

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Cutting edge self-renewable during operation

175336, 175404, E21B 900

Patent

active

042301939

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. Each of the drill members includes a plurality of vertically spaced rows of diamond-shaped openings disposed, or formed, in the sides, or wall, thereof, the openings in adjacent rows being offset from each other and overlapping at their upper and lower ends whereby as the lower ends of the drill member wear away, cutting edges are continuously formed thereon by the diamond-shaped openings.

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: 2342931 (1944-02-01), Fortune
patent: 2819043 (1958-01-01), Henderson
patent: 2830795 (1958-04-01), Center, Jr.
patent: 2833520 (1958-05-01), Owen
patent: 2966949 (1961-01-01), Wepsala, Jr.
patent: 3295617 (1967-01-01), Willis
patent: 3495359 (1970-02-01), Smith et al.

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