Drill bit with cemented carbide inserts
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United States of America Patent
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-
Aug 28, 1990
Grant Date -
N/A
app pub date -
Jul 28, 1989
filing date -
Jul 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill bit of the percussion type includes a bit body of steel, a front portion of which is provided with at least one slot in which an insert is attached by brazing. Brazed between the insert and side walls of the slot are side plates which are of uniform thickness while being thinner than the insert. The side plates are formed of cemented carbide or a metal alloy with a coefficient of linear expansion which for temperatures below 500.degree. C. is substantially smaller than that of steel and the braze metal while being approximately the same as that of the insert.
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