Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent
1975-02-03
1976-05-11
Abbott, Frank L.
Boring or penetrating the earth
Bit or bit element
Nonsymmetrical bit
175410, 175418, E21C 1301
Patent
active
039556352
ABSTRACT:
A substantially solid drill bit has a relatively flat face at its forward end; the face comprises a plurality of plateaus, preferably three in number, which are separated by radial relief channels that intersect one another near the center of the face. The sides of the body constitute a frustrum of a cone, preferably having an included angle of about 14.degree., with the narrow portion of the cone being at the base of the body. Spiral grooves extend along the sides of the body, and at least some of these spiral grooves intersect the radial relief channels. A plurality of hardened inserts or buttons are mounted on the face of the bit, and the radial spacing of such inserts from the longitudinal axis of the body is such that there is an overlap of the "track" or "trace" of each insert by the track of another insert, as the body is rotated about its longitudinal axis. Preferably, each plateau (or lobe) and its associated hardened inserts is different from the others; and there should be a substantial distance between at least some of the hardened inserts, in order to foster the fragmentation of relatively large rock chips. The bit is provided with a base or anvil which is adapted to receive percussive blows from a percussion hammer. Also, splines or the like are typically provided somewhere on the bit so that it may be rotated as well as driven forward. A plurality of flow passages extend through the body of the drill bit to permit the delivery of a drilling fluid to the face of the bit.
REFERENCES:
patent: 2558415 (1951-06-01), Bonsall
patent: 2838286 (1958-06-01), Austin
patent: 3269470 (1966-08-01), Kelly
patent: 3357507 (1967-12-01), Stewart
patent: 3388756 (1968-06-01), Varel et al.
patent: 3583504 (1971-06-01), Aalund
patent: 3608654 (1971-09-01), Powell
patent: 3693736 (1972-09-01), Gardner
patent: 3788409 (1974-01-01), Curington
Abbott Frank L.
Favreau Richard E.
McHugh Charles W.
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