US5377773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit having combined positive and negative or neutral rake cutters
Assignee: Baker Hughes Holdings LLC
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Filing: 1993-12-08
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Granted: 1995-01-03
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Expires: 2013-12-08
Abstract
Abstract A drill bit, and a cutter for a drill bit, are provided, wherein the cutter will encounter the formation with cutting surfaces of differing rake angles to optimize cutting efficiency. In most circumstances, the cooperating cutters will have differing, positive, and negative or neutral rakes. Cutters of differing rakes may be cooperatively paired on a drill bit such that the portion of a formation which is affected by the action of one cutter may be similarly affected by the operation of the other cutter.
Inventors
- 👤 Gordon A. Tibbitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:54
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
78 words
A drill bit adapted for rotatably cutting a borehole in a formation at a preselected linear rate, comprising: a bit body having a face disposed on its exterior surface; a plurality of cutters distributed on the face of said bit, at least some of aid cutters having first and second cutting surfaces formed thereon, said first cutting surfaces being established at an effective negative rake angle, said second cutting surfaces being established at an effective positive rake angle.
Claim 2
Dependent Claim
78 words
A drill bit adapted for rotatably cutting a borehole in a formation at a preselected linear rate, comprising: a bit body having a face disposed on its exterior surface; a plurality of cutters distributed on the face of said bit, at least some of aid cutters having first and second cutting surfaces formed thereon, said first cutting surfaces being established at an effective negative rake angle, said second cutting surfaces being established at an effective positive rake angle.
Claim 3
Dependent Claim
19 words
The drill bit of claim 1, wherein said first and second cutting surfaces are of substantially the same width.
Claim 4
Dependent Claim
17 words
The drill bit of claim 2, wherein said first and second cutting surfaces are of differing widths.
Claim 5
Dependent Claim
25 words
The drill bit of claim 1, wherein said first and second cutting surfaces extend along generally parallel axes relative to the direction of bit rotation.
Claim 6
Dependent Claim
22 words
The drill bit of claim 1, wherein said first and second cutting surfaces extend approximately the same height from said bit face.
Claim 7
Dependent Claim
20 words
The drill bit of claim 1, wherein said first and second cutting surfaces extend differing heights from said bit face.
Claim 8
Dependent Claim
24 words
The drill bit of claim 1, wherein said first and second cutting surfaces are disposed at different side rake angles relative to one another.
Claim 9
Dependent Claim
49 words
The drill bit of claim 1, wherein one of said first and second cutting surfaces is disposed generally perpendicular to the direction of travel of said cutters, and wherein the other of said first and second cutting surfaces is disposed at a side rake to said direction of travel.
Claim 10
Dependent Claim
19 words
The drill bit of claim 1, wherein one of said cutting surfaces leads the other of said cutting surfaces.
Claim 11
Dependent Claim
23 words
The drill bit of claim 1, wherein at least one of said first and second cutting surfaces is at least in part arcuate.
Claim 12
Dependent Claim
57 words
A cutter adapted for use on a drill bit for cutting earth formations, comprising: a body portion; and a cutting portion adapted to engage a formation substantially simultaneously at differing rake angles, one of said differing rake angles comprising a positive rake angle and at least another of said differing rake angles comprising a negative rake angle.
Claim 13
Dependent Claim
57 words
A cutter adapted for use on a drill bit for cutting earth formations, comprising: a body portion; and a cutting portion adapted to engage a formation substantially simultaneously at differing rake angles, one of said differing rake angles comprising a positive rake angle and at least another of said differing rake angles comprising a negative rake angle.
Claim 14
Dependent Claim
24 words
The cutter of claim 11, wherein said cutting portion includes a generally contiguous surface adapted to engage said formation at said differing rake angles.
Claim 15
Dependent Claim
25 words
The cutter of claim 11, wherein said cutting portion includes at least two cutting surfaces, at least one of which cutting surfaces is generally planar.
Claim 16
Dependent Claim
14 words
The cutter of claim 13, wherein all of said cutting surfaces are generally planar.
Claim 17
Dependent Claim
21 words
The cutter of claim 13, wherein said cutting surfaces are arranged on lateral axes which are generally parallel to one another.
Claim 18
Dependent Claim
30 words
The cutter of claim 15, wherein said lateral axes are generally perpendicular to the intended direction of travel of said cutter when said cutter is utilized on a drill bit.
Claim 19
Dependent Claim
26 words
The cutter of claim 13, wherein said cutting surfaces are adapted to extend a generally uniform depth relative to the body of a said drill bit.
Claim 20
Dependent Claim
33 words
The cutter of claim 13, wherein at least one of said cutting surfaces is adapted to extend a lesser distance from the body of a said drill bit than an adjacent cutting surface.
Claim 21
Dependent Claim
31 words
The cutter of claim 11, wherein at least one of said differing rake angles of said cutting portion leads at least another of said differing rake angles of said cutting portion.
Claim 22
Dependent Claim
28 words
The cutter of claim 11, wherein said cutting portion includes at least two cutting surfaces, at least one of which cutting surfaces is at least in part arcuate.
Claim 23
Dependent Claim
57 words
A cutter adapted for use on a drill bit for cutting earth formations, comprising: a body portion; and a cutting portion adapted to engage a formation substantially simultaneously at differing rake angles, one of said differing rake angles comprising a positive rake angle and at least another of said differing rake angles comprising a neutral rake angle.
Claim 24
Dependent Claim
57 words
A cutter adapted for use on a drill bit for cutting earth formations, comprising: a body portion; and a cutting portion adapted to engage a formation substantially simultaneously at differing rake angles, one of said differing rake angles comprising a positive rake angle and at least another of said differing rake angles comprising a neutral rake angle.
Claim 25
Dependent Claim
24 words
The cutter of claim 21, wherein said cutting portion includes a generally contiguous surface adapted to engage said formation at said differing rake angles.
Claim 26
Dependent Claim
25 words
The cutter of claim 21, wherein said cutting portion includes at least two cutting surfaces, at least one of which cutting surfaces is generally planar.
Claim 27
Dependent Claim
14 words
The cutter of claim 23, wherein all of said cutting surfaces are generally planar.
Claim 28
Dependent Claim
21 words
The cutter of claim 23, wherein said cutting surfaces are arranged on lateral axes which are generally parallel to one another.
Claim 29
Dependent Claim
30 words
The cutter of claim 25, wherein said lateral axes are generally perpendicular to the intended direction of travel of said cutter when said cutter is utilized on a drill bit.
Claim 30
Dependent Claim
26 words
The cutter of claim 23, wherein said cutting surfaces are adapted to extend a generally uniform depth relative to the body of a said drill bit.
Claim 31
Dependent Claim
33 words
The cutter of claim 23, wherein at least one of said cutting surfaces is adapted to extend a lesser distance from the body of a said drill bit than an adjacent cutting surface.
Claim 32
Dependent Claim
28 words
The cutter of claim 21, wherein said cutting portion includes at least two cutting surfaces, at least one of which cutting surfaces is at least in part arcuate.
Claim 33
Dependent Claim
31 words
The cutter of claim 21, wherein at least one of said differing rake angles of said cutting portion leads at least another of said differing rake angles of said cutting portion.
Claim 34
Dependent Claim
54 words
A cutter adapted for use on a drill bit for cutting earth formations, comprising: a body portion; and a cutting portion including at least two cutting surfaces adapted to extend a generally uniform depth relative to the body of a said drill bit and to engage a formation substantially simultaneously at differing rake angles.
Claim 35
Dependent Claim
54 words
A cutter adapted for use on a drill bit for cutting earth formations, comprising: a body portion; and a cutting portion including at least two cutting surfaces adapted to extend a generally uniform depth relative to the body of a said drill bit and to engage a formation substantially simultaneously at differing rake angles.
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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) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |