Claims
- 1. A drill bit comprising a synthetic diamond cutter comprising:
- a stud body having a first end mounted in the bit and a heel portion defined at a second end;
- a cylindrical body having a first end interfacing with the stud body and a second end opposite the first end, wherein a portion of the outer surface of the cylindrical body is aligned with an outer surface of the heel portion;
- a diamond cutter face formed at the second end of the cylindrical body;
- an exposed groove depression formed entirely in the heel portion and extending on the cylindrical body, the groove having a surface having a leading edge adjacent to the diamond cutter face, and a trailing edge on the heel portion.
- 2. A drill bit as recited in claim 1 wherein the groove has a leading edge abutting the diamond cutter face.
- 3. A drill bit as recited in claim 1 wherein the groove is asymmetrical in cross-section.
- 4. A drill bit as recited in claim 1 wherein the groove spans a portion of about 60.degree. to 180.degree. of the heel and cylindrical body.
- 5. A drill bit comprising a cutter, the cutter comprising:
- a right circular cylindrical body having a radius having a length and having a cylindrical outer surface, a first end interfacing with the bit and an end face opposite the first end;
- an ultra hard material layer on the end face, the layer having a circumferential edge, wherein a portion of the circumferential edge is used to cut during drilling; and
- an exposed recess formed on the cylindrical surface adjacent to said portion of the circumferential edge, wherein the recess is formed on less than the entire length of the cylindrical body, wherein the recess has a maximum depth penetrating radially inward into the cylindrical body not greater than the length of the radius, and wherein a majority of the recess is concave in cross-section.
- 6. A drill bit as recited in claim 5 wherein the recess is spaced apart from the ultra hard material layer.
- 7. A drill bit as recited in claim 5, wherein the recess has a non-symmetric cross-section.
- 8. A drill bit comprising a cutter, the cutter comprising:
- a right circular cylindrical body having a cylindrical outer surface, a first end interfacing with the bit, a central axis, an end face opposite the first end, and a radius having a length;
- an ultra hard material layer on the end face, the layer having a circumferential edge, wherein a portion of the circumferential edge is used to cut during drilling; and
- an exposed recess formed entirely in the cylindrical body and having a trailing edge terminated at the cylindrical surface spaced apart from the first end, said recess being adjacent to said portion of the circumferential edge of the ultra hard material layer, wherein the recess cross-section along a plane running along the central axis is concave, and wherein the recess has a maximum depth penetrating radially inward into the cylindrical body not greater than the length of the radius.
- 9. A drill bit as recited in claim 8 wherein the recess is spaced apart from the ultra hard material layer.
- 10. A drill bit as recited in claim 8 wherein the recess has a non-symmetric cross-section.
- 11. A drill bit as recited in claim 8 wherein the recess spans only a portion of the cylindrical surface circumference.
- 12. A stud cutter comprising:
- a stud body;
- a right circular cylindrical body having a cylindrical outer surface and an end face, the cylindrical body attached to the stud body;
- an ultra hard material layer on the end face, the layer having a circumferential edge, wherein a portion of the circumferential edge is used to cut during drilling;
- an exposed circumferential recess formed on the cylindrical surface adjacent to said portion of the circumferential edge of the ultra hard material layer, wherein said recess does not extend to the stud body and does not penetrate through the entire cylindrical body and does not penetrate through the entire cylindrical body.
- 13. A stud cutter as recited in claim 12 wherein the recess extends around a portion of the cylindrical body circumference.
- 14. A stud cutter as recited in claim 12 wherein the recess formed on the cylindrical outer surface extends onto the stud body.
- 15. A stud cutter as recited in claim 14 wherein the recess has a non-symmetric cross-section.
- 16. A stud cutter as recited in claim 14 wherein the recess has a width that varies circumferentially.
- 17. A stud cutter as recited in claim 16 wherein the cutter has a heel surface for contacting earth formations, the heel surface comprising a portion of a surface of the stud body and a portion of the cylindrical surface, wherein the recess has a maximum width along the heel surface.
- 18. A stud cutter as recited in claim 17 wherein the recess has a non-symmetric cross-section.
- 19. A cutter comprising:
- a right circular cylindrical body having a cylindrical outer surface, a first end and an end face opposite the first end;
- an ultra hard material layer on the end face, the layer having a circumferential edge, wherein a portion of the circumferential edge is used to cut during drilling; and
- a concave indentation formed on the cylindrical surface beginning adjacent to said portion of the circumferential edge of the ultra hard material layer and ending on the cylindrical outer surface.
- 20. A cutter comprising:
- a right circular cylindrical body having a cylindrical outer surface, a first end and an end face opposite the first end;
- an ultra hard material layer on the end face, the layer having a circumferential edge, wherein a portion of the circumferential edge is used to cut during drilling; and
- a recessed surface formed on the cylindrical body adjacent to said portion of the circumferential edge of the ultra hard material layer, wherein the recess surface comprises a leading edge spaced apart from the ultra hard material layer, and a trailing edge terminating at the cylindrical outer surface and wherein the recessed surface does not venetrate through the entire cylindrical body.
- 21. A drill bit comprising a cutter, the cutter comprising:
- a right circular cylindrical body having a cylindrical outer surface and an end face;
- an ultra hard material layer on the end face; and
- an exposed indentation formed on the cylindrical surface, the indentation having a leading edge abutting the ultra hard material layer, wherein the indentation is formed on less than the entire length of the cylindrical body and wherein a majority of the indentation is concave in cross-section.
- 22. A drill bit comprising a cutter, the cutter comprising:
- a right circular cylindrical body having a cylindrical outer surface and an end face;
- an ultra hard material layer on the end face; and
- an exposed recess formed on the cylindrical surface, the recess having a leading edge abutting the ultra hard material layer, a trailing edge intersecting the cylindrical outer surface, and a continuous surface between the leading and trailing edges.
Parent Case Info
This application is a continuation of application Ser. No. 08/668,611 filed Jun. 18, 1996, now abandoned.
US Referenced Citations (17)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2276645 |
Oct 1994 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
668611 |
Jun 1996 |
|