Cutter mounting for drag bits

Details Cutter mounting for drag bits Cutter mounting for drag bits

1987-05-19

1988-06-28

Massie, Jerome

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

76108A, 175329, E21B 1046

Patent

active

047533056

ABSTRACT:
An improved method and apparatus for supporting a cutting member in a drag bit wherein the cutting member includes a cylindrical stud or body having an angularly disposed cylindrical portion projecting therefrom with a cutting wafer bonded to the face of the cylindrical portion. A hole is formed in the bit body with an angular recess intersecting the hole. The recess conforms generally to the configuration of the cylindrical portion so that in the preferred form of the invention, the bit body engages the cylindrical portion to prevent rotation of the cutter in the bit body. Also, the engagement between the bit body and the cylindrical portion occurs in such a matter as to avoid a contact between the bit body and the wafer thus avoiding imposing stresses on the cutting wafer. The engagement aids in preventing fluid erosion and in orienting the cutting member in the bit body during assembly.

REFERENCES:
patent: 4431065 (1984-02-01), Andrews
patent: 4442909 (1984-04-01), Radtke
patent: 4499958 (1985-02-01), Radtke et al.
patent: 4574895 (1986-03-01), Dolezal et al.
patent: 4593777 (1986-06-01), Barr
patent: 4676124 (1987-06-01), Fisher
patent: 4679639 (1987-07-01), Barr et al.

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