Drill bits for obtaining core samples

Details Drill bits for obtaining core samples Drill bits for obtaining core samples

1978-08-21

1980-02-19

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175402, E21B 963

Patent

active

041890159

ABSTRACT:
A drill bit used for obtaining core samples in concrete or rock formations. The drill bit comprises a cylindrical body having a generally annular-shaped cutting surface at one end and at least one waterway including an inner channel on the interior surface of the body extending to the cutting surface and an outer channel on the exterior surface of the body extending to the cutting surface at a point radially spaced from the point where the inner channel extends to the cutting surface. The waterway further includes a recessed portion on the cutting surface connecting the inner and outer channels at the points at which the channels respectively extend to the cutting surface. Such a waterway helps to wash the cutting surface of the bit so that concentration of drill cuttings on the cutting surface is minimized.

REFERENCES:
patent: 2495400 (1950-01-01), Williams, Jr.
patent: 2633682 (1953-04-01), Jackson
patent: 2838284 (1958-06-01), Austin
patent: 3181632 (1965-05-01), Raynal
patent: 3640355 (1972-02-01), Lebourg
patent: 3692127 (1972-09-01), Hampe et al.
patent: 3833077 (1974-09-01), Lavallee

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