Claims
- 1. A drill bit comprising:a bit body; at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body; and at least one cutter element extending from a primary row in said roller cone, said cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a non-rectilinear crest.
- 2. A drill bit comprising:a bit body; at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body; and at least one cutter element extending from a primary row in said roller cone, said cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a non-rectilinear crest; wherein said crest is a substantially S-shaped spline.
- 3. The bit in accordance with claim 2 wherein said base is non-circular.
- 4. The bit in accordance with claim 2 wherein said base is non-cylindrical.
- 5. The bit in accordance with claim 2 wherein at least two cutter elements have non-rectilinear crests.
- 6. The bit in accordance with claim 2 wherein at least one cutter element has an extending portion having zero draft.
- 7. The bit in accordance with claim 2 wherein at least one cutter element has an extending portion having negative draft.
- 8. The bit in accordance with claim 2 wherein at least one cutter element has an extending portion having positive draft.
- 9. The bit in accordance with claim 2 wherein at least one cutter element has an extending portion having a contoured surface.
- 10. A drill bit comprising:a bit body; at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body; and at least one cutter element extending from a primary row in said roller cone, said cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a non-rectilinear crest; wherein said cutter element has a concave leading face and a convex trailing face when viewed along the longitudinal axis of the cutter element.
- 11. A drill bit comprising:a bit body; at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body; and at least one cutter element extending from a primary row in said roller cone, said cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a non-rectilinear crest; wherein said cutter element has a longitudinal axis and said longitudinal axis is offset such that it does not intersect the axis of said cone.
- 12. A drill bit comprising:a bit body; at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body; and at least one cutter element extending from a primary row in said roller cone, said cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a non-rectilinear crest; wherein said cutter element has a leading face that includes both concave and convex portions when viewed along the longitudinal axis of the cutter element.
- 13. The bit in accordance with claim 12 wherein said crest is arcuate.
- 14. The bit in accordance with claim 12 wherein said base is non-circular.
- 15. The bit in accordance with claim 12 wherein said base is non-cylindrical.
- 16. The bit in accordance with claim 12 wherein at least two cutter elements have non-rectilinear crests.
- 17. The bit in accordance with claim 12 wherein at least one cutter element has an extending portion having zero draft.
- 18. The bit in accordance with claim 12 wherein at least one cutter element has an extending portion having negative draft.
- 19. The bit in accordance with claim 12 wherein at least one cutter element has an extending portion having positive draft.
- 20. The bit in accordance with claim 12 wherein at least one cutter element has an extending portion having a contoured surface.
CROSS-REFERENCE TO RELATED APPLICATION
The present application claims the benefit of 35 U.S.C. 111(b) provisional application Ser. No. 60/057,915 filed Sep. 4, 1997 and entitled “Cutter Element with Expanded Crest Geometry” and is a divisional of application Ser. No. 09/146,095, filed Sep. 3, 1998 and entitled “Cutter Element with Expanded Crest Geometry”, now U.S. Pat. No. 6,241,034, both of which are incorporated herein by reference.
US Referenced Citations (9)
Provisional Applications (1)
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Number |
Date |
Country |
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60/057915 |
Sep 1997 |
US |