Elements faced with superhard material

Details Elements faced with superhard material Elements faced with superhard material

1998-06-16

2000-07-04

Evans, Geoffrey S.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

E21B 1046

Patent

active

060824743

ABSTRACT:
A preform element, such as a preform cutting element for a rotary drag-type drill bit, includes a facing table of polycrystalline diamond having a front face, a peripheral surface, and a rear surface bonded to the front surface of a tungsten carbide substrate. The front surface of the substrate is formed with a plurality of recesses into which extend corresponding projections formed on the rear surface of the facing table. The recesses include at least one rebate which extends around only a part of the periphery of the substrate and into which extends a projection on the facing table which provides a part of the peripheral surface of the facing table.

REFERENCES:
patent: 4784023 (1988-11-01), Dennis
patent: 5120327 (1992-06-01), Dennis
patent: 5351772 (1994-10-01), Smith
patent: 5590728 (1997-01-01), Matthias et al.
patent: 5709279 (1998-01-01), Dennis
patent: 5788001 (1998-08-01), Matthias et al.
patent: 5888619 (1999-03-01), Griffin

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