Elements faced with superhard material
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United States of America Patent
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Jul 4, 2000
Grant Date -
N/A
app pub date -
Jun 16, 1998
filing date -
Jul 26, 1997
priority date (Note) -
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status (Latency Note)
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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.
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