Claims
- 1. A drilling tool for drilling a hole in the ground including:
- a drill bit sub having a lower reduced portion;
- removably mounted means removably mounted on said lower reduced portion of said drill bit sub;
- said removably mounted means having a plurality of wear strips thereon;
- said drill bit sub including an annular surface formed at an angle to its longitudinal axis;
- said removably mounted means having an upper annular surface formed at the same angle to its longitudinal axis as said annular surface of said drill bit sub for engagement with said annular surface of said drill bit sub when said removably mounted means is mounted on said lower reduced portion of said drill bit sub;
- a drill bit releasably attached to the bottom of said drill bit sub for rotation therewith;
- said drill bit having a plurality of cutters;
- said upper annular surface of said removably mounted means being held against said annular surface of said drill bit sub when said drill bit is releasably attached to said drill bit sub to prevent said removably mounted means from rotating relative to said drill bit sub when said drill bit sub is rotated;
- and each of said wear strips on said removably mounted means being substantially aligned with one of said cutters on said drill bit.
- 2. The drilling tool according to claim 1 in which said removably mounted means includes:
- a hollow cylindrical tube having said upper annular surface of said removably mounted means as its upper surface;
- and a first ring disposed between said hollow cylindrical tube and said drill bit and engaging each, said first ring having at least one weakened portion capable of being fractured.
- 3. The drilling tool according to claim 1 including:
- said drill bit sub including: an upper threaded end for attachment to a drill section of said drilling tool; and an upper reduced portion beneath said upper threaded end of said drill bit sub;
- and a second ring mounted on said upper reduced portion of said drill bit sub, said second ring having at least one weakened portion capable of being fractured.
- 4. The drilling tool according to claim 2 in which:
- said drill bit includes a support surface for supporting the bottom of said first ring;
- and said hollow cylindrical tube has a bottom surface engaging the top of said first ring.
- 5. The drilling tool according to claim 2 in which each of said annular surface of said drill bit sub and said annular surface of said hollow cylindrical tube is at an angle of no greater than 87.degree. to the longitudinal axis of each of said drill bit sub and said hollow cylindrical tube.
- 6. The drilling tool according to claim 1 including:
- said drill bit sub including:
- an upper threaded end for attachment to a drill section of said drilling tool;
- and an upper reduced portion beneath said upper threaded end of said drill bit sub;
- and a ring mounted on said upper reduced portion of said drill bit sub, said ring having at least one weakened portion capable of being fractured.
- 7. The drilling tool according to claim 6 in which each of said annular surface of said drill bit sub and said upper annular surface of said removably mounted means is at an angle no greater than 87.degree. to the longitudinal axis of each of said drill bit sub and said removably mounted means.
- 8. The drilling tool according to claim 1 in which each of said annular surface of said drill bit sub and said upper annular surface of said removably mounted means is at an angle of no greater than 87.degree. to the longitudinal axis of each of said drill bit sub and said removably mounted means.
- 9. The drilling tool according to claim 6 in which said ring includes:
- inner and outer circular surfaces;
- first, second, and third weakened portions capable of being fractured;
- said second weakened portion being circumferentially spaced from said first weakened portion less than said second weakened portion is circumferentially spaced from said third weakened portion, said second weakened portion being circumferentially spaced less than 180.degree. from said first weakened portion;
- and said third weakened portion being circumferentially spaced from said first weakened portion less than said third weakened portion is circumferentially spaced from said second weakened portion.
- 10. The drilling tool according to claim 9 in which said ring includes:
- upper and lower surfaces substantially parallel to each other;
- a first slot formed in said upper surface between at least a portion of said first weakened portion and at least a portion of said second weakened portion;
- and a second slot formed in said lower surface between at least a portion of said first weakened portion and at least a portion of said second weakened portion.
- 11. A drilling tool for drilling a hole in the ground including:
- a drill bit sub having a lower reduced portion;
- a collar mounted on the uppermost portion of said lower reduced portion and fixed to said drill bit sub;
- said collar having its lower surface formed at an angle to its longitudinal axis;
- removably mounted means removably mounted on said lower reduced portion of said drill bit sub beneath said collar;
- said removably mounted means having a plurality of wear strips thereon;
- said removably mounted means having its upper surface formed at the same angle to its longitudinal axis as said lower surface of said collar for engagement with said lower surface of said collar;
- a drill bit releasably attached to the bottom of said drill bit sub for rotation therewith;
- said drill bit having a plurality of cutters;
- said upper surface of said removably mounted means being held against said lower surface of said collar when said drill bit is releasably attached to said drill bit sub to prevent said removably mounted means from rotating relative to said drill bit sub when said drill bit sub is rotated;
- and each of said wear strips on said removably mounted means being substantially aligned with one of said cutters on said drill bit.
- 12. The drilling tool according to claim 11 in which said removably mounted means includes:
- a hollow cylindrical tube having said upper annular surface of said removably mounted means as its upper surface;
- and a first ring disposed between said hollow cylindrical tube and said drill bit and engaging each, said first ring has at least one weakened portion capable of being fractured.
- 13. The drilling tool according to claim 12 including:
- said drill bit sub including:
- an upper threaded end for attachment to a drill section of said drilling tool;
- and an upper reduced portion beneath said upper threaded end of said drill bit sub;
- and a second ring mounted on said upper reduced portion of said drill bit sub, said second ring having at least one weakened portion capable of being fractured.
- 14. The drilling tool according to claim 12 in which:
- said drill bit includes a support surface for supporting the bottom of said first ring;
- and said hollow cylindrical tube has a bottom surface engaging the top of said first ring.
- 15. The drilling tool according to claim 12 in which each of said lower surface of said collar and said upper surface of said hollow cylindrical tube is at an angle of no greater than 87.degree. to the longitudinal axis of each of said collar and said hollow cylindrical tube.
- 16. The drilling tool according to claim 11 including:
- said drill bit sub including:
- an upper threaded end for attachment to a drill section of said drilling tool;
- and an upper reduced portion beneath said upper threaded end of said drill bit sub;
- and a ring mounted on said upper reduced portion of said drill bit sub, said ring having at least one weakened portion capable of being fractured.
- 17. The drilling tool according to claim 16 in which each of said lower surface of said collar and said upper surface of said removably mounted means is at an angle of no greater than 87.degree. to the longitudinal axis of each of said collar and said removably mounted means.
- 18. The drilling tool according to claim 11 in which each of said lower surface of said collar and said upper surface of said removably mounted means is at an angle of no greater than 87.degree. to the longitudinal axis of each of said collar and said removably mounted means.
- 19. The drilling tool according to claim 11 in which each of said lower surface of said collar and said upper surface of said removably mounted means is at an angle of 85.degree. to the longitudinal axis of each of said collar and said removably mounted means.
- 20. A protective sleeve for removably mounting on a lower reduced portion of a drill bit sub of a drilling tool having a drill bit with cutters for drilling a hole in the ground with the drill bit releasably attached to the drill bit sub, said protective sleeve including:
- a hollow cylindrical tube having its upper surface formed at an angle to its longitudinal axis for engagement with a corresponding annular surface on the drill bit sub formed at the same angle to its longitudinal axis as said upper surface of said hollow cylindrical tube;
- and said hollow cylindrical tube having a plurality of equally angularly spaced wear strips on its outer surface for substantial alignment with the cutters on the drill bit when said hollow cylindrical tube is mounted on the lower reduced portion of the drill bit sub and the drill bit is releasably attached to the drill bit sub to cause the upper surface of the hollow cylindrical tube to be held against the corresponding annular surface of the drill bit sub.
- 21. The protective sleeve according to claim 20 in which said upper surface of said hollow cylindrical tube is at an angle of no greater than 87.degree. to its longitudinal axis.
- 22. The protective sleeve according to claim 20 in which said upper surface of said hollow cylindrical tube is at an angle of 85.degree. to its longitudinal axis.
- 23. A break out ring for mounting on a circular surface of a drilling tool including:
- inner and outer circular surfaces;
- first, second, and third weakened portions capable of being fractured;
- said second weakened portion being circumferentially spaced from said first weakened portion less than said second weakened portion is circumferentially spaced from said third weakened portion, said second weakened portion being circumferentially spaced less than 180.degree. from said first weakened portion;
- and said third weakened portion being circumferentially spaced from said first weakened portion less than said third weakened portion is circumferentially spaced from said second weakened portion.
- 24. The ring according to claim 23 including:
- upper and lower surfaces substantially parallel to each other;
- a first slot formed in said upper surface between at least a portion of said first weakened portion and at least a portion of said second weakened portion;
- and a second slot formed in said lower surface between at least a portion of said first weakened portion and at least a portion of said second weakened portion.
- 25. The ring according to claim 24 including each of said first weakened portion, said second weakened portion, and said third weakened portion being formed by removing material from at least one of said inner and outer circular surfaces.
- 26. The ring according to claim 23 including:
- upper and lower surfaces substantially parallel to each other;
- a first slot formed in said upper surface from the remote end of said first weakened portion to the remote end of said second weakened portion;
- and a second slot formed in said lower surface from the remote end of said first weakened portion to the remote end of said second weakened portion.
- 27. The ring according to claim 26 including each of said first weakened portion, said second weakened portion, and said third weakened portion being formed by removing material from at least one of said inner and outer circular surfaces.
- 28. The ring according to claim 26 including each of said first weakened portion, said second weakened portion, and said third weakened portion being formed by removing material from each of said inner and outer circular surfaces.
- 29. The ring according to claim 23 including each of said first weakened portion, said second weakened portion, and said third weakened portion being formed by removing material from at least one of said inner and outer circular surfaces.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 07/713,267, filed Jun. 11, 1991, now abandoned.
US Referenced Citations (8)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
713267 |
Jun 1991 |
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