Rotational drill bits and drilling apparatuses including the same
View Patent ↗A roof-bolt drill bit has a bit body that is rotatable about a central axis, a coupling pocket defined in the bit body, and at least one cutting element mounted to the bit body, the at least one cutting element having a non-cylindrical periphery. The at least one cutting element includes a cutting face, a cutting edge adjacent the cutting face, a back surface opposite the cutting face, and a side surface extending between the cutting edge and the back surface, at least a portion of the side surface of the at least one cutting element being bonded to a side surface of the coupling pocket. The roof-bolt drill bit includes a coupling projection extending from the at least one cutting element, the coupling projection being bonded to a coupling recess defined in the bit body.
1. A roof-bolt drill bit, comprising:
a bit body rotatable about a central axis;
a coupling pocket defined in the bit body, the coupling pocket including a back mounting surface and a side surface;
at least one cutting element mounted to the bit body, the at least one cutting element having a non-cylindrical periphery and comprising:
a cutting face;
a cutting edge adjacent the cutting face;
a back surface opposite the cutting face;
a side surface extending between the cutting edge and the back surface, at least a portion of the side surface of the at least one cutting element being bonded to the side surface of the coupling pocket;
at least one coupling recess defined in the bit body positioned adjacent the at least one cutting element;
a coupling projection extending from the at least one cutting element;
wherein the coupling projection is bonded to the coupling recess by brazing.
2. The roof-bolt drill bit of claim 1 , wherein the coupling projection extends from the back surface of the at least one cutting element.
3. The roof-bolt drill bit of claim 1 , wherein the coupling projection extends from the side surface of the at least one cutting element.
4. The roof-bolt drill bit of claim 1 , wherein the coupling projection comprises a portion of a coupling attachment extending through an opening defined in the cutting element.
5. The roof-bolt drill bit of claim 1 , further comprising another coupling projection extending from the bit body;
wherein:
the at least one cutting element further comprises another coupling recess defined in the at least one cutting element;
the other coupling projection is positioned within the other coupling recess.
6. The roof-bolt drill bit of claim 5 , wherein the other coupling projection comprises a portion of a coupling attachment extending through an opening defined in the bit body.
7. The roof-bolt drill bit of claim 5 , further comprising a coupling insert positioned within the other coupling recess, wherein the other coupling projection is at least partially surrounded by the coupling insert.
8. The roof-bolt drill bit of claim 1 , wherein:
at least a portion of the coupling pocket includes another coupling projection extending away from the side surface;
the at least one cutting element comprises another coupling recess corresponding to the other coupling projection.
9. The roof-bolt drill bit of claim 1 , further comprising a locking member attached to the bit body;
wherein the locking member is positioned adjacent the at least one cutting element such that the cutting element is secured to the bit body.
10. The roof-bolt drill bit of claim 9 , wherein:
the locking member is movable between an unlocked position and a locked position;
the locking member is positioned adjacent the at least one cutting element in the locked position.
11. The roof-bolt drill bit of claim 9 , wherein at least a portion of the locking member is positioned adjacent at least one of the cutting face and the side surface of the at least one cutting element.
12. The roof-bolt drill bit of claim 9 , wherein:
the cutting element comprises another coupling recess;
at least a portion of the locking member is positioned within the other coupling recess.
13. The roof-bolt drill bit of claim 1 , wherein the at least one cutting element comprises two cutting elements positioned circumferentially substantially 180° apart with substantially the same back rake and side rake angles.
14. The roof-bolt drill bit of claim 1 , further comprising a coupling attachment secured to the bit body, wherein at least a portion of the cutting element is positioned between the coupling attachment and the bit body.
15. The roof-bolt drill bit of claim 14 , wherein the coupling attachment comprises at least one engagement feature positioned adjacent the at least one cutting element.
16. The roof-bolt drill bit of claim 1 , wherein the at least one cutting element further comprises a superabrasive material bonded to a substrate.
17. The roof-bolt drill bit of claim 16 , wherein the superabrasive material comprises a polycrystalline diamond material.
18. The roof-bolt drill bit of claim 1 , wherein the coupling projection has a smaller diameter than the cutting element.
19. A roof-bolt drill bit, comprising:
a bit body rotatable about a central axis;
a coupling pocket defined in the bit body, the coupling pocket including a back mounting surface and a side surface;
at least one cutting element mounted to the bit body, the at least one cutting element having a non-cylindrical periphery and comprising:
a superabrasive table comprising:
a cutting face;
a cutting edge adjacent the cutting face;
a substrate bonded to the superabrasive table, the substrate comprising a back surface opposite the cutting face;
a side surface extending between the cutting edge and the back surface, at least a portion of the side surface of the at least one cutting element being bonded to the side surface of the coupling pocket;
a coupling projection extending from the back surface of the substrate;
wherein the coupling projection is secured to the bit body.
20. The roof-bolt drill bit of claim 19 , further comprising at least one coupling recess defined in the bit body positioned adjacent the at least one cutting element;
wherein the coupling projection is bonded to the coupling recess.
21. The roof-bolt drill bit of claim 19 , further comprising a coupling attachment secured to the bit body,
wherein the coupling projection is secured within a coupling recess of the coupling attachment.
22. The roof-bolt drill bit of claim 19 , wherein the coupling projection is bonded to the back surface of the substrate.