Patent US4640375A successfully refreshed from Google Patents.
US4640375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit and cutter therefor
Assignee: ReedHycalog LP
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Filing: 1984-02-08
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Granted: 1987-02-03
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Expires: 2004-02-08
Abstract
Abstract The invention comprises a drag-type drill bit including a bit body adapted for rotative movement in a pre-determined direction in use and having an operating end face, and a plurality of cutting members mounted in the bit body. Each of the cutting members has a stud portion disposed in a respective recess in the bit body and defining the inner end of the cutting member, and a cutting face generally adjacent its outer end facing outwardly through the operating end face of the bit body and terminating in an outermost cutting edge. The centerline of the stud portion is rearwardly inclined, from the outer end to the inner end, with respect to the direction of movement in use, taken at the midpoint of the cutting edge, at a first angle from 80° to 30° inclusive. The cutting face is oriented such that the tangent to the cutting face at the midpoint of the cutting edge and in the central plane of the cutting member is disposed at a second angle, from 18° to 75° inclusive, with respect to the centerline of the stud portion.
Inventors
- 👤 John D. Barr
- 👤 John M. Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/60; E21B10/602
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
183 words
A drag-type drill bit comprising: a bit body adapted for rotative movement in a pre-determined direction in use and having an operating end face; and a plurality of cutting members mounted in said bit body, each of said cutting members having a stud portion disposed in a respective recess in said bit body and defining the inner end of said cutting member, and a cutting face generally adjacent the outer end of the cutting member facing outwardly through said end face of said bit body and terminating in an outermost cutting edge, the centerline of said stud portion being rearwardly inclined from said outer end to said inner end with respect to said direction of movement in use--taken at the midpoint of said cutting edge--at a first angle from 80° to 30° inclusive; and said cutting face being oriented such that the tangent to said cutting face at the midpoint of said cutting edge and in the central plane of the cutting member, is disposed at a second angle, from 18° to 75° inclusive, with respect to the centerline of said stud portion.
Claim 2
Dependent Claim
183 words
A drag-type drill bit comprising: a bit body adapted for rotative movement in a pre-determined direction in use and having an operating end face; and a plurality of cutting members mounted in said bit body, each of said cutting members having a stud portion disposed in a respective recess in said bit body and defining the inner end of said cutting member, and a cutting face generally adjacent the outer end of the cutting member facing outwardly through said end face of said bit body and terminating in an outermost cutting edge, the centerline of said stud portion being rearwardly inclined from said outer end to said inner end with respect to said direction of movement in use--taken at the midpoint of said cutting edge--at a first angle from 80° to 30° inclusive; and said cutting face being oriented such that the tangent to said cutting face at the midpoint of said cutting edge and in the central plane of the cutting member, is disposed at a second angle, from 18° to 75° inclusive, with respect to the centerline of said stud portion.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein said cutting face has a back rake angle at said cutting edge of about -20°, and wherein said second angle is from 38° to 75° inclusive.
Claim 4
Dependent Claim
32 words
The apparatus of claim 1 wherein said cutting face has a back rake angle at said cutting edge of about -10°, and wherein said second angle is from 28° to 65° inclusive.
Claim 5
Dependent Claim
32 words
The apparatus of claim 1 wherein said cutting face has a back rake angle at said cutting edge of about 0°, and wherein said second angle is from 18° to 55° inclusive.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1 wherein said first angle is from 65° to 50° inclusive, and wherein said second angle is from 25° to 60° inclusive.
Claim 7
Dependent Claim
32 words
The apparatus of claim 5 wherein said cutting face has a back rack angle at said cutting edge of about -20°, and wherein said second angle is from 45° to 60° inclusive.
Claim 8
Dependent Claim
32 words
The apparatus of claim 5 wherein said cutting face has a back rack angle at said cutting edge of about -10°, and wherein said second angle is from 35° to 50° inclusive.
Claim 9
Dependent Claim
32 words
The apparatus of claim 5 wherein said cutting face has a back rake angle at said cutting edge of about 0°, and wherein said second angle is from 25° to 40° inclusive.
Claim 10
Dependent Claim
101 words
The apparatus of claim 1 wherein said end face of said bit body includes a plurality of upsets each having a leading edge surface and at least one recess extending through each such leading edge surface, said end face of said bit body further comprising a plurality of flow paths, each of said leading edge surfaces having one of said flow paths extending therealong and inset therefrom; and wherein each of said cutting members has its stud portion mounted in a respective one of said recesses, with its cutting face facing generally outwardly along said leading edge surface of said upset.
Claim 11
Dependent Claim
38 words
The apparatus of claim 9 wherein each of said stud portions has a significant part thereof, opposite said cutting face, embedded in and supported by the material of said bit body in the respective one of said upsets.
Claim 12
Dependent Claim
36 words
The apparatus of claim 10 wherein the walls of each of said recesses abut the respective stud portion about more than 180° of its periphery measured in a plane transverse to and intersecting said cutting face.
Claim 13
Dependent Claim
36 words
The apparatus of claim 9 wherein the walls of each of said recesses abut the respective stud portion about more than 180° of its periphery measured in a plane transverse to and intersecting said cutting face.
Claim 14
Dependent Claim
53 words
The apparatus of claim 9 wherein said upsets are elongate ribs each arranged to have a substantial radial component of direction, with respect to said end face of said bit body, at each point along its length, and wherein said cutting faces are fully exposed along said leading edge surfaces of said ribs.
Claim 15
Dependent Claim
63 words
The apparatus of claim 13 wherein said bit body has a plurality of circulation ports opening through said end face and communicating with said flow paths, the number of said ports being less than the number of flow paths extending along said leading edge surfaces of said ribs, and at least some of said ports communicating with more than one such flow path.
Claim 16
Dependent Claim
59 words
The apparatus of claim 14 wherein said bit body has a central longitudinal bore, and wherein said ports are defined by rectilinear bores each intersecting said central bore and each intersecting said end face of said bit body at an angle of about 0° to 40° from the normal to the bit body at the point of such intersection.
Claim 17
Dependent Claim
23 words
The apparatus of claim 15 wherein each of said ports is located a different radial distance from the centerline of said bit body.
Claim 18
Dependent Claim
135 words
A drag-type drill bit comprising: a bit body adapted for rotative movement in a given direction in use and having an operating end face; and a plurality of cutting members mounted in said bit body, each of said cutting members having a stud portion disposed in a respective recess in said bit body and defining the inner end of said cutting member, and a cutting face generally adjacent the outer end of said cutting member, facing outwardly from said end face of said bit body, and defining an outermost cutting edge; the centerline of said stud portion being rearwardly inclined from the outer end to the inner end of said cutting member with respect to said direction of movement in use--taken at the midpoint of said cutting edge--at an angle from 65° to 50° inclusive.
Claim 19
Dependent Claim
135 words
A drag-type drill bit comprising: a bit body adapted for rotative movement in a given direction in use and having an operating end face; and a plurality of cutting members mounted in said bit body, each of said cutting members having a stud portion disposed in a respective recess in said bit body and defining the inner end of said cutting member, and a cutting face generally adjacent the outer end of said cutting member, facing outwardly from said end face of said bit body, and defining an outermost cutting edge; the centerline of said stud portion being rearwardly inclined from the outer end to the inner end of said cutting member with respect to said direction of movement in use--taken at the midpoint of said cutting edge--at an angle from 65° to 50° inclusive.
Claim 20
Dependent Claim
87 words
A cutting member for use in a drag-type drill bit comprising: a stud portion defining one end of said cutting member; a cutting face generally adjacent the other end of said cutting member and defining an outermost cutting edge; said cutting face being oriented such that the tangent to said cutting face at the midpoint of said cutting edge and in the central plane of the cutting member is disposed at an angle from 36° to 60° inclusive with respect to the centerline of said stud portion.
Claim 21
Dependent Claim
87 words
A cutting member for use in a drag-type drill bit comprising: a stud portion defining one end of said cutting member; a cutting face generally adjacent the other end of said cutting member and defining an outermost cutting edge; said cutting face being oriented such that the tangent to said cutting face at the midpoint of said cutting edge and in the central plane of the cutting member is disposed at an angle from 36° to 60° inclusive with respect to the centerline of said stud portion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |