Cutter assemblies for rotary drill bits

Details Cutter assemblies for rotary drill bits Cutter assemblies for rotary drill bits

1996-03-15

1998-06-23

Neuder, William P.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175432, E21B 1046

Patent

active

057691754

ABSTRACT:
A cutter for a rotary drill bit comprises a cutting table of superhard material bonded to a less hard substrate, the cutting table having a front face and a peripheral edge at least a part of which defines a convexly curved cutting region. The substrate includes a portion which increases in lateral extent beyond the curved cutting region of the peripheral edge of the cutting table as it extends rearwardly . The rearward extent of the outer surface of said portion varies around the periphery of the cutting table, from a maximum adjacent the cutting region to a minimum diametrically opposite the cutting region. This renders the cutter more resistant to impact loads in the cutting region while, at the same time, allowing the opposite side of the cutter to be firmly mounted in a socket in the body of the drill bit.

REFERENCES:
patent: Re32036 (1985-11-01), Dennis
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4679639 (1987-07-01), Barr et al.
patent: 4987800 (1991-01-01), Gasan et al.
patent: 5016718 (1991-05-01), Tandberg
patent: 5435403 (1995-07-01), Tibbits
patent: 5566779 (1996-10-01), Dennis
patent: 5590728 (1997-01-01), Matthias et al.

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