Cutting edge for monobloc drilling tools
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
May 1, 1997
filing date -
Jun 16, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An integral tool bit for drilling a rock formation, including a cemented metal carbide holder (30) attached to the tool and joined, e.g. soldered, to a plate (34) in the form of a cylindrical disc made from polycrystalline diamond particles and having a side wall (40), and a substantially flat free surface (36). The plate (34) is positioned so that the plane of its free flat surface (36) is at an acute angle (.alpha.) to a line (N) normal to the surface (25) of the rock formation, and the angle is directed in the same direction as the forward direction (F) of the drill bit so that the plate engages the rock formation with its side wall (40).
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