Percussion drill bit and a regrindable cemented carbide button therefor
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United States of America Patent
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Apr 24, 2007
Grant Date -
Jul 28, 2005
app pub date -
Mar 26, 2003
filing date -
Apr 4, 2002
priority date (Note) -
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Abstract
A percussion drill bit for drilling a bore includes a drill body having a connecting section at a rear end thereof for connection to a percussive unit, and a plurality of cemented carbide buttons embedded in a front end of the drill body. Each button comprises a cemented carbide body having a rear mounting portion embedded in the drill body, and a front end protruding from the drill body. The front end of the cemented carbide button is substantially semi-spherically curved and defined by a radius whose origin is disposed axially rearwardly of a plane through the largest diameter of the button. The button projects from the drill bit body a distance which is not less than 50% of the button diameter. A conical intermediate surface forms, in cross-section, an acute angle of about 13 19.degree. with an envelope surface of the rear mounting portion.
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