Rotational drill bits and drilling apparatuses including the same
View Patent ↗A roof-bolt drill bit includes 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 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. The roof-bolt drill bit additionally includes a coupling attachment coupled to the bit body, the coupling attachment being positioned adjacent to a portion of the side surface of the cutting element that abuts a side surface of the coupling pocket.
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;
a coupling attachment coupled to the bit body, the coupling attachment abutting the cutting face of the at least one cutting element, the coupling attachment extending beyond and overlapping a portion of the side surface of the at least one cutting element;
wherein the side surface of the at least one cutting element abuts the coupling pocket.
2. The roof-bolt drill bit of claim 1 , wherein the coupling attachment abuts the side surface of the at least one cutting element.
3. The roof-bolt drill bit of claim 1 , wherein the coupling attachment extends from the bit body to the at least one cutting element.
4. The roof-bolt drill bit of claim 1 , wherein the coupling attachment comprises an engagement feature positioned adjacent to the at least one cutting element.
5. The roof-bolt drill bit of claim 1 , wherein:
the at least one cutting element defines a recess;
a portion of the coupling attachment is disposed within the recess.
6. The roof-bolt drill bit of claim 1 , wherein:
the coupling attachment defines a recess;
a portion of the at least one cutting element is disposed within the recess.
7. The roof-bolt drill bit of claim 1 , wherein:
the at least one cutting element defines a recess;
a portion of the bit body is disposed within the recess.
8. The roof-bolt drill bit of claim 1 , wherein the coupling attachment includes a threaded portion.
9. The roof-bolt drill bit of claim 8 , wherein:
the coupling attachment is rotatable between a locked position and an unlocked position;
in the locked position, the coupling attachment abuts a portion of the at least one cutting element;
in the unlocked position, the coupling attachment does not abut the at least one cutting element.
10. The roof-bolt drill bit of claim 1 , wherein:
the at least one cutting element comprises a plurality of side surfaces;
the coupling attachment abuts two or more of the plurality of side surfaces of the at least one cutting element.
11. The roof-bolt drill bit of claim 10 , wherein each of the plurality of side surfaces of the at least one cutting element are disposed at an angle with respect to each other.
12. 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.
13. The roof-bolt drill bit of claim 1 , wherein the at least one cutting element further comprises a superabrasive material bonded to a substrate.
14. The roof-bolt drill bit of claim 13 , wherein the superabrasive material comprises a polycrystalline diamond material.
15. 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 coupling attachment extending through a portion of the bit body into a coupling recess defined in the at least one cutting element adjacent to the back surface of the at least one cutting element;
a coupling insert positioned within the at least one cutting element, the coupling insert defining the coupling recess in the at least one cutting element.
16. The roof-bolt drill bit of claim 15 , wherein the coupling attachment is threadedly coupled within the coupling recess.