Claims
- 1. A rotary drill bit, comprising:
- a bit body which includes a main body portion and at least one integral, outwardly extending protrusion thereon of a hard metal matrix material;
- at least one cutting element mounted on the leading face of said at least one protrusion; and
- a solid, preformed structure for reinforcing said at least one protrusion extending outwardly from the hard metal matrix material of the interior of said main body portion at an acute angle to a centerline of said main body portion into the hard metal matrix material of the protrusion to the rear of said at least one cutting element, at least partially therebehind and in spaced relationship thereto.
- 2. The rotary drill bit of claim 1 in which said solid preformed structure is a rod, bar, disk, or wire.
- 3. The rotary drill bit of claim 2 in which said preformed structure is positioned at an acute angle with respect to said main body portion of said bit body.
- 4. The rotary drill bit of claim 1 in which said preformed structure is fabricated from steel.
- 5. The rotary drill bit of claim 1 in which said preformed structure is of cylindrical steel stock.
- 6. The rotary drill bit of claim 5 in which said cylindrical steel stock is threaded.
- 7. The rotary drill bit of claim 1 in which said reinforcing structure comprises a longitudinally extending element disposed in substantially perpendicular orientation to the profile of said main body portion.
- 8. The rotary drill bit of claim 1 in which said reinforcing structure extend to substantially the outermost portions of said protrusions.
- 9. The rotary drill bit of claim 1 in which said at least one protrusion supports a single, substantially laterally symmetrical cutting element, and said reinforcing structure comprises a rodlike element centered with respect to and to the rear of said cutting element.
- 10. A rotary drill bit, comprising:
- a bit body which includes a main body portion and at least one integral protrusion extending outwardly therefrom, said main body portion and protrusion being formed of a hard matrix material;
- at least one cutting element mounted on the leading face of said protrusion; and a solid, preformed structure for reinforcing said at least one protrusion extending from the interior of said main body portion outwardly at an acute angle with respect to a centerline thereof into said protrusion in rearwardly spaced relationship to said at least one cutting element and at least partially therebehind.
- 11. The rotary drill bit of claim 10 in which said reinforcing structure comprises a longitudinally extending element disposed in substantially perpendicular orientation to the profile of said main body portion.
- 12. The rotary drill bit of claim 10 in which said reinforcing structure extends to substantially the outermost portion of said protrusion.
- 13. The rotary drill bit of claim 10 in which said protrusion supports a single, substantially laterally symmetrical cutting element, and said reinforcing structure comprises a rodlike element centered with respect to and to the rear of said cutting element.
- 14. The rotary drill bit of claim 10 in which said solid preformed structure is a rod, bar, disk, or wire.
- 15. The rotary drill bit of claim 14 in which said preformed structure is fabricated from steel.
- 16. The rotary drill bit of claim 14 in which said preformed structure is of threaded cylindrical steel stock.
- 17. The rotary drill bit of claim 14 in which said preformed structure is positioned at an acute angle with respect to said main body portion.
Parent Case Info
This application is a continuation of copending application Ser. No. 07/149,374, filed Jan. 28, 1988, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
149374 |
Jan 1988 |
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