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US 5,855,247 AGranted
Rolling-cutter earth-boring bit having predominantly super-hard cutting elements
AssigneeBaker Hughes Incorporated
InventorsDanny E. Scott, Amy J.G. Jurewicz, Stephen R. Jurewicz
Life of this patent
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Abstract
An earth-boring bit has a bit body. At least one cantilevered bearing shaft depends inwardly and downwardly from the bit body and a cutter is mounted for rotation on the bearing shaft. The cutter includes a plurality of cutting elements, at least one of which has a generally cylindrical element body of hard metal. A pair of flanks extend from the body and converge to define a crest. The crest defines at least one sharp cutting edge at its intersection with one of the flanks.
Claims16
An earth-boring bit comprising:
- a bit body;
- at least one bearing shaft depending inwardly and downwardly from the bit body;
- a cutter mounted for rotation on the bearing shaft, the cutter including a plurality of cutting elements arranged on the cutter in circumferential rows;
- at least one of the cutting elements in one of the rows being a super-hard cutting element having a cutting end protecting from the cutter and a generally cylindrical base secured in an aperture formed in the cutter, the super-hard cutting element being formed with at least 80 percent of the material of the super-hard cutting element being a super-hard material;
- and
- the cutting end of the super-hard cutting element being formed entirely of the super-hard material.
3 more elements
An earth-boring bit comprising:
- a bit body;
- at least one bearing shaft depending inwardly and downwardly from the bit body;
- a cutter mounted for rotation on the bearing shaft, the cutter including a plurality of cutting elements arranged on the cutter in circumferential rows;
- at least one of the cutting elements in one of the rows being formed at least predominantly of super-hard material;
- wherein
- the super-hard cutting element has a cutting end projecting from the cutter and a generally cylindrical base secured in an aperture in the cutter;
- and wherein
- the cutting end of the super-hard cutting element is formed entirely of super-hard material and the base is formed at least predominantly of super-hard material.
5 more elements
An earth-boring bit comprising:
- a bit body;
- at least one bearing shaft depending inwardly and downwardly from the bit body;
- a cutter mounted for rotation on the bearing shaft, the cutter including a plurality of cutting elements arranged on the cutter in circumferential rows, the circumferential rows including a gage row proximal the outermost surface of the cutter;
- at least one of the cutting elements in the gage row being formed at least predominantly of super-hard material;
- wherein the super-hard cutting element has a frusto-conical cutting end projecting from the cutter and a generally cylindrical base secured in an aperture in the cutter;
- and
- the cutting end of the super-hard cutting element is formed entirely of super-hard material and the base is formed at least predominantly of super-hard material.
4 more elements
An earth-boring bit comprising:
- a bit body having an axis of rotation;
- at least one bearing shaft depending inwardly and downwardly from the bit body;
- a cutter mounted for rotation on the bearing shaft, the cutter including a plurality of cutting elements arranged on the cutter in circumferential rows, the circumferential rows including an outer row and a plurality of inner rows, the inner rows being located closer to the axis than the outer row;and
- at least one of the cutting elements in one of the inner rows being formed at least predominantly of super-hard material;
- wherein the super-hard cutting element has a cutting end projecting from the cutter and a generally cylindrical base secured in a socket in the cutter;
- and
- the cutting end of the super-hard cutting element is formed entirely of super-hard material and the base is formed at least predominantly of super-hard material.
4 more elements
Dependencies are inferred from the claim text.