Drag bit and cutters

Details Drag bit and cutters Drag bit and cutters

1983-02-22

1985-12-17

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, 175379, E21B 1046

Patent

active

045587531

ABSTRACT:
A drill bit comprises a bit body having an operating end face. A plurality of self-sharpening cutters are mounted in the bit body and extend through the operating end face. The cutters have cutting faces adapted to engage an earth formation and cut the earth formation to a desired three-dimensional profile. The cutting faces define surfaces having back rake angles which decrease with distance from the profile. The individual cutting faces may be inwardly concave in a plane parallel to the intended direction of motion of the cutter in use.

REFERENCES:
patent: 1025735 (1912-05-01), Bosredon
patent: 1835701 (1931-12-01), Edmunds
patent: 1859717 (1932-05-01), Rutrle
patent: 2033594 (1936-03-01), Stoody
patent: 2072470 (1937-03-01), Thompson
patent: 2998088 (1961-08-01), Pennington, II
patent: 3239275 (1966-03-01), Belugou
patent: 3882749 (1975-05-01), Tourek
patent: 4199035 (1980-04-01), Thompson
patent: 4350215 (1982-09-01), Radtke
patent: 4351401 (1982-09-01), Fielder

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