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US 5,630,479 AGranted
Cutting element for drill bits
OwnerMahlon D. Dennisinventor
Life of this patent
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Abstract
A cutting element which has a metal carbide stud having a conic tip formed with a reduced diameter hemispherical outer tip end portion of said metal carbide stud. A layer of polycrystalline material, resistant to corrosive and abrasive materials, is disposed over the outer end portion of the metal carbide stud to form a cap. An alternate conic form has a flat tip face. A chisel insert has a transecting edge and opposing flat faces. It is also covered with a PDC layer.
Claims4
A cutting element comprising:
- (a) a metal carbide stud having an outer end having a transverse transecting edge portion at the remote outer end thereof;
- (b) left and right opposing tapered faces formed next to said edge portion wherein each of said faces has a substantially planar surface area extending from said edge and wherein said faces are the left face and the right face and said faces intersect to define said transecting edge portion;
- and
- (c) a layer of polycrystalline material disposed directly over said face portion of said metal carbide stud, wherein said face has mechanisms which enhance the adhesion of said polycrystalline material to said face, and wherein said polycrystalline material comprising particles selected from diamond, cubic boron nitride, wurtzite boron nitride, and mixtures thereof bonded together in a unitary relationship.
1 more element
Dependencies are inferred from the claim text.