Preform cutting elements for rotary drill bits

Details Preform cutting elements for rotary drill bits Preform cutting elements for rotary drill bits

1998-09-01

2000-08-08

Schoeppel, Roger

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175432, 175435, E21B 1036

Patent

active

060987294

ABSTRACT:
A preform cutting element, for a rotary drag-type drill bit, includes a facing table of superhard material having a front face, a peripheral surface, and a rear surface bonded to the front surface of a substrate which is less hard than the superhard material. The facing table extends across only a part of the front surface of the substrate, and part of the substrate engages the peripheral surface of the facing table. When such a cutting element is mounted on a bit body with the part of the facing table periphery which is engaged by the substrate being located opposite the cutting edge of the element, the part of the substrate which engages the periphery of the facing table acts as a mechanical support to the facing table so as to resist impact and other loads to which the facing table may be subject in use.

REFERENCES:
patent: 5435403 (1995-07-01), Ortloff
patent: 5472376 (1995-12-01), Olmstead et al.
patent: 5492188 (1996-02-01), Smith et al.
patent: 5605198 (1997-02-01), Tibbitts
patent: 5967249 (1999-10-01), Butcher
patent: 5971087 (1999-10-01), Chaves

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