Single-waterway drill bits and systems for using same
Implementations of the present invention include drilling tools having axially-tapered waterways that can increase flushing and bit life, while also decreasing clogging. According to some implementations of the present invention, the drilling tool can have a single notch extending into the cutting face and a plurality of bores extending from the cutting face to an interior space of the drilling tool. Implementations of the present invention also include drilling systems including drilling tools having a single notch and a plurality of bores.
1. A core-sampling drill bit having a longitudinal axis, comprising:
a shank;
an annular crown surrounding the longitudinal axis of the drill bit, the annular crown having a cutting face, an inner surface, and an outer surface, the annular crown and the shank cooperating to define an interior space about the longitudinal axis configured to receive a core sample;
wherein the annular crown defines a single notch, wherein the notch extends radially from the inner surface to the outer surface, and wherein the notch extends axially from the cutting face into at least a portion of the annular crown relative to the longitudinal axis, and
wherein the annular crown further defines a plurality of bores, wherein each bore of the plurality of bores is enclosed within the annular crown between the inner surface and the outer surface, and wherein at least one bore of the plurality of bores extends from the cutting face to the interior space.
2. The core-sampling drill bit of claim 1 , wherein the notch is axially tapered whereby the notch has a longitudinal dimension at the outer surface of the annular crown that is greater than a longitudinal dimension of the notch at the inner surface of the annular crown.
3. The core-sampling drill bit of claim 1 , wherein the notch is radially tapered whereby the notch has a variable width, wherein the width of the notch is greater at the outer surface of the annular crown than at the inner surface of the annular crown.
4. The core-sampling drill bit of claim 2 , wherein the notch is radially tapered whereby the notch has a variable width, wherein the width of the notch is greater at the outer surface of the annular crown than at the inner surface of the annular crown.
5. The core-sampling drill bit of claim 1 , wherein the outer surface of the annular crown defines at least one channel extending radially inwardly toward the longitudinal axis.
6. The core-sampling drill bit of claim 5 , wherein the shank has an outer surface, and wherein the outer surface of the annular crown cooperates with the outer surface of the shank to define each channel of the at least one channel.
7. The core-sampling drill bit of claim 5 , wherein the at least one channel comprises a plurality of channels.
8. The core-sampling drill bit of claim 7 , wherein each channel of the plurality of channels has a width, and wherein the width of each channel decreases from the outer surface of the annular crown moving radially inwardly toward the longitudinal axis.
9. The core-sampling drill bit of claim 7 , wherein the plurality of channels are substantially equally circumferentially spaced about the outer surface of the annular crown.
10. The core-sampling drill bit of claim 7 , wherein the plurality of channels are substantially equally sized.
11. The core-sampling drill bit of claim 1 , wherein the plurality of bores are substantially equally distributed about the cutting face.
12. The core-sampling drill bit of claim 1 , wherein the plurality of bores are randomly spaced from a center point of the drill bit.
13. The core-sampling drill bit of claim 1 , wherein the plurality of bores are selectively patterned about the cutting face.
14. The core-sampling drill bit of claim 13 , wherein the plurality of bores comprises at least two concentric rows of bores, and wherein the bores within each respective concentric row are substantially equally spaced from a center point of the drill bit.
15. The core-sampling drill bit of claim 14 , wherein the at least two concentric rows of bores comprises an inner concentric row of bores and an outer concentric row of bores, wherein each respective bore of the outer concentric row is positioned at a selected orientation relative to a corresponding bore of the inner concentric row.
16. The core-sampling drill bit of claim 15 , wherein the plurality of bores comprises a plurality of pairs of bores, each pair of bores comprising an inner bore of the inner concentric row of bores and a corresponding outer bore of the outer concentric row, each bore of the plurality of bores having a center point, wherein the center point of the outer bore of each pair of bores is positioned at a selected angle relative to a radian passing through a center point of the drill bit and the center point of the inner bore of the pair of bores.
17. The core-sampling drill bit of claim 16 , wherein the outer surface of the annular crown defines a plurality of channels extending radially inwardly toward the longitudinal axis.
18. The core-sampling drill bit of claim 17 , wherein at least one channel of the plurality of channels is positioned proximate a corresponding pair of bores.
19. The core-sampling drill bit of claim 17 , wherein each channel of the plurality of channels has a center point, wherein the selected angle is a selected acute angle, and wherein the center point of at least one channel of the plurality of channels is positioned in substantial alignment with an orientation line passing through the center points of the inner and outer bores of a corresponding pair of bores.
20. The core-sampling drill bit of claim 19 , wherein the center point of each channel of the plurality of channels is positioned in substantial alignment with an orientation line passing through the center points of the inner and outer bores of a corresponding pair of bores.
21. The core-sampling drill bit of claim 20 , wherein the inner surface of the annular crown defines at least one flute extending radially outwardly away from the longitudinal axis of the drill bit, wherein each flute of the at least one flute has a center point, and wherein the center point of each flute of the at least one flute is positioned in substantial alignment with a respective orientation line.
22. The core-sampling drill bit of claim 21 , wherein the at least one flute comprises a plurality of flutes.