Rotary drill bits and cutting elements for such bits
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United States of America Patent
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-
Jul 14, 1987
Grant Date -
N/A
app pub date -
Nov 30, 1984
filing date -
Dec 3, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cutting element for a rotary drill bit comprises a thin hard facing layer, defining a front cutting face, bonded to a less hard backing layer. The backing layer is of non-uniform thickness, for example is wedge-shaped, and is thicker adjacent the cutting edge of the facing layer than it is over the rest of the area of the facing layer. The rear surface of the backing layer of the cutting element is bonded to a surface on a carrier which is mounted in the bit body. The backing layer of the cutting element may be formed in two portions: a front portion which is bonded to the hard facing layer and a second, wedge-shaped portion which is bonded subsequently to the rear surface of the first portion.
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