Drill bit

Details Drill bit Drill bit

1981-01-02

1982-05-18

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

E21B 1052

Patent

active

043300448

ABSTRACT:
A drill bit having a hollow shank, a cutting element and a mounting bridge supported in diametrically opposed cutouts at one end of the shank. The bridge is U-shaped in cross section with a base and spaced parallel legs perpendicular to the base. The cutting element is mounted in the bridge with the inner surfaces of the parallel legs of the bridge embracing a portion of each face of the cutting element and the bottom edge of the cutting element resting on the base of the bridge to support the cutting element against shear forces and against compression forces. The edge of the shank which supports the bridge is uneven throughout each 180.degree. of its periphery on both sides of the diametrically opposed cutouts.

REFERENCES:
patent: 2971409 (1961-02-01), Peters et al.
patent: 3010345 (1961-11-01), Wagner
patent: 3032129 (1962-05-01), Fletcher et al.
patent: 3089552 (1963-05-01), Black et al.
patent: 3415332 (1968-12-01), Bower, Jr.
patent: 3434552 (1967-03-01), Bowen, Jr.
patent: 3434553 (1969-03-01), Weller
patent: 3434554 (1969-03-01), Bower, Jr.
patent: 3595327 (1971-07-01), Self
patent: 4099585 (1978-07-01), Emmerich
patent: 4190125 (1980-02-01), Emmerich et al.
patent: 4190128 (1980-02-01), Emmerich
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