Granted Patent B2

US 12,607,071 · App. 18/930,205 · Granted Apr 21, 2026

Inventors: Nagesh Kumar Gk (Bangalore, IN); Mahesh Magadaiah (Bangalore, IN); Deepak S. Achar (Bangalore, IN); Prashanth Suresh (Bangalore, IN); Srihari Varma (Bangalore, IN); Balachandra Hegde (Bangalore, IN)

Assignee: KENNAMETAL INDIA LTD.

E21B10/38E21B10/43E21B10/56

Abstract

Claims (41)

1 . A drill-bit comprising:

a head comprising a face and a gage;

the face comprising a plurality of face button bits;

the gage comprising a plurality of gage button bits evenly spaced around the head;

a plurality of major chip gage gashes evenly spaced around the head;

a plurality of minor chip gage gashes evenly spaced around the head;

an axis extending through centers of the plurality of face button bits extending through one of the plurality of major chip gage gashes and one of the plurality of minor chip gage gashes;

the plurality of major chip gage gashes alternating with the plurality of minor chip gage gashes around the head; and

one of the plurality of gage button bits disposed in-between every set of the alternating major chip gage gashes and minor chip gage gashes.

2 . The drill-bit of claim 1 wherein the face comprises two face button bits and the gage comprises six gage button bits.

3 . The drill-bit of claim 1 wherein the face consists of two face button bits and the gage consists of six gage button bits.

4 . The drill-bit of claim 1 further comprising a plurality of face flushing holes and a plurality of gage flushing holes.

5 . The drill-bit of claim 4 wherein one of the plurality of gage flushing holes is disposed in one of the plurality of major chip gage gashes and another of the plurality of gage flushing holes is disposed in one of the plurality of minor chip gage gashes.

6 . The drill-bit of claim 4 wherein the axis extending through the centers of the plurality of face button bits extends perpendicularly to a second axis extending through centers of the plurality of face flushing holes.

7 . The drill-bit of claim 4 wherein a second axis extending through centers of the plurality of face flushing holes is perpendicular to a third axis extending through centers of the plurality of gage flushing holes.

8 . The drill-bit of claim 1 wherein a slope of the face is disposed at a non-parallel angle relative to a lateral axis of the drill-bit.

9 . A drill-bit comprising:

a head comprising a face and a gage;

the face comprising a plurality of face button bits;

the gage comprising a plurality of gage button bits evenly spaced around the head;

a plurality of major chip gage gashes evenly spaced around the head;

a plurality of minor chip gage gashes evenly spaced around the head;

a plurality of face flushing holes;

a plurality of gage flushing holes;

the plurality of major chip gage gashes alternating with the plurality of minor chip gage gashes around the head; and

one of the plurality of gage button bits disposed in-between every set of the alternating major chip gage gashes and minor chip gage gashes;

wherein a first axis extending through centers of the plurality of face flushing holes is perpendicular to a second axis extending through centers of the plurality of gage flushing holes.

10 . The drill-bit of claim 9 wherein the face comprises two face button bits and the gage comprises six gage button bits.

11 . The drill-bit of claim 9 wherein the face consists of two face button bits and the gage consists of six gage button bits.

12 . The drill-bit of claim 9 wherein one of the plurality of gage flushing holes is disposed in one of the plurality of major chip gage gashes and another of the plurality of gage flushing holes is disposed in one of the plurality of minor chip gage gashes.

13 . The drill-bit of claim 9 wherein a third axis extending through centers of the plurality of face button bits extends perpendicularly to the first axis extending through the centers of the plurality of face flushing holes.

14 . The drill-bit of claim 9 wherein a slope of the face is disposed at a non- parallel angle relative to a lateral axis of the drill-bit.

15 . A method of using a drill-bit comprising:

rotating the drill-bit to cut material with a plurality of face button bits and a plurality of gage button bits, the plurality of gage button bits evenly spaced around a head of the drill-bit;

flowing air through a plurality of face flushing holes and through a plurality of gage flushing holes; and

flushing the material cut by the drill-bit through a plurality of major chip gage gashes evenly spaced around the head, and through a plurality of minor chip gage gashes evenly spaced around the head, the plurality of major chip gage gashes alternating with the plurality of minor chip gage gashes around the head, one of the plurality of gage button bits disposed in-between every set of the alternating major chip gage gashes and minor chip gage gashes, and a first axis extending through centers of the plurality of face flushing holes being perpendicular to a second axis extending through centers of the plurality of gage flushing holes.

16 . The method of claim 15 wherein the face comprises two face button bits and the gage comprises six gage button bits.

17 . The method of claim 15 wherein the face consists of two face button bits and the gage consists of six gage button bits.

18 . The method of claim 15 wherein one of the plurality of gage flushing holes is disposed in one of the plurality of major chip gage gashes and another of the plurality of gage flushing holes is disposed in one of the plurality of minor chip gage gashes.

19 . The method of claim 15 wherein a third axis extending through centers of the plurality of face button bits extends perpendicularly to the first axis extending through the centers of the plurality of face flushing holes.

20 . The method of claim 15 wherein a slope of the face is disposed at a non-parallel angle relative to a lateral axis of the drill-bit.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (27)