Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1998-11-02
2000-11-14
Neuder, William
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175428, E21B 1036
Patent
active
061456071
ABSTRACT:
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 facing table has at least one peripheral locking portion projecting rearwardly from the rear surface of the facing table into the substrate, the inner surface of the locking portion and the adjacent part of the substrate having interengaging formations whereby part of the substrate overlies at least one part of the locking portion. With this arrangement, forces acting on the facing table tending to lift it from the front surface of the substrate are resisted by the portion of the substrate which overlies the part of the locking portion.
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Griffin Nigel Dennis
Matthias Terry R.
Camco International (UK) Limited
Daly Jeffrey E.
Dougherty Jennifer R
Neuder William
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