US4716975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting element having a stud and cutting disk bonded thereto
Assignee: Diamant Boart Stratabit USA Inc
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Filing: 1987-02-03
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Granted: 1988-01-05
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Expires: 2007-02-03
Abstract
Abstract A cutting element for use in rotary drill bits comprises a generally cylindrical stud and a cutting disk bonded to a supporting surface of the stud. The supporting surface intersects a cylindrical side surface of the stud to form an edge. The supporting surface includes a plurality of alternating projections and grooves extending in a front-to-rear direction of a supporting surface. The projections and grooves include rear ends terminating short of the edge to minimize the formation of stress cracks in the edge.
Inventors
- 👤 Mahlon D. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:39
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/573; E21B10/5735; Y; Y10; Y10T; Y10T407/00; Y10T407/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
156 words
A cutting element for use in rotary drill bits which cut in subterranean formations, comprising a generally cylindrical stud having a supporting surface disposed at a front end thereof, and a cutting disk including a substrate having a first surface bonded to said supporting surface and a second surface disposed parallel to said supporting surface and carrying a diamond substance, said supporting surface intersecting a cylindrical side surface of said stud to form an edge surrounding said supporting surface, said supporting surface including a plurality of alternating projections and grooves extending in a generally front-to-rear direction of said supporting surface, said projections and grooves including rear ends terminating short of a region of said edge situated longitudinally rearwardly of a longitudinal front half of said substrate, said first surface of said substrate including a plurality of alternating projections and grooves intermeshing with said grooves and projections of said supporting surface, with a bonding material sandwiched therebetween.
Claim 2
Dependent Claim
156 words
A cutting element for use in rotary drill bits which cut in subterranean formations, comprising a generally cylindrical stud having a supporting surface disposed at a front end thereof, and a cutting disk including a substrate having a first surface bonded to said supporting surface and a second surface disposed parallel to said supporting surface and carrying a diamond substance, said supporting surface intersecting a cylindrical side surface of said stud to form an edge surrounding said supporting surface, said supporting surface including a plurality of alternating projections and grooves extending in a generally front-to-rear direction of said supporting surface, said projections and grooves including rear ends terminating short of a region of said edge situated longitudinally rearwardly of a longitudinal front half of said substrate, said first surface of said substrate including a plurality of alternating projections and grooves intermeshing with said grooves and projections of said supporting surface, with a bonding material sandwiched therebetween.
Claim 3
Dependent Claim
32 words
A cutting element according to claim 1, wherein said projections and grooves of said supporting surface and said first surface lie in planes disposed parallel to a longitudinal axis of said stud.
Claim 4
Dependent Claim
25 words
A cutting element according to claim 1, wherein said supporting surface is oriented at an acute angle relative to a longitudinal axis of said stud.
Claim 5
Dependent Claim
24 words
A cutting element according to claim 1, wherein said projections and grooves of said supporting surface extend forwardly all the way to said edge.
Claim 6
Dependent Claim
16 words
A cutting element according to claim 1, wherein said projections and grooves are of V-shaped cross-section.
Claim 7
Dependent Claim
187 words
A rotary drill bit for cutting in subterranean formations, said drill bit comprising a bit body, and a plurality of cutting elements mounted in said bit body which cut said formation as said bit body is advanced in a fore-aft direction, each said cutting element comprising a generally cylindrical stud having a supporting surface disposed at a front end thereof, and a cutting disk including a substrate having a first surface bonded to said supporting surface and a second surface disposed parallel to said supporting surface and carrying a diamond substance, said supporting surface intersecting a cylindrical side surface of said stud to form an edge surrounding said supporting surface, said supporting surface including a plurality of alternating projections and grooves extending in a generally front-to-rear direction of said supporting surface, said projections and grooves including rear ends terminating short of a region of said edge situated longitudinally rearwardly of a longitudinal front half of said substrate, said first surface of said substrate including a plurality of alternating projections and grooves intermeshing with said grooves and projections of said supporting surface, with a bonding material sandwiched therebetween.
Claim 8
Dependent Claim
187 words
A rotary drill bit for cutting in subterranean formations, said drill bit comprising a bit body, and a plurality of cutting elements mounted in said bit body which cut said formation as said bit body is advanced in a fore-aft direction, each said cutting element comprising a generally cylindrical stud having a supporting surface disposed at a front end thereof, and a cutting disk including a substrate having a first surface bonded to said supporting surface and a second surface disposed parallel to said supporting surface and carrying a diamond substance, said supporting surface intersecting a cylindrical side surface of said stud to form an edge surrounding said supporting surface, said supporting surface including a plurality of alternating projections and grooves extending in a generally front-to-rear direction of said supporting surface, said projections and grooves including rear ends terminating short of a region of said edge situated longitudinally rearwardly of a longitudinal front half of said substrate, said first surface of said substrate including a plurality of alternating projections and grooves intermeshing with said grooves and projections of said supporting surface, with a bonding material sandwiched therebetween.
Claim 9
Dependent Claim
32 words
A drill bit according to claim 6, wherein said projections and grooves of said supporting surface and said first surface lie in planes disposed parallel to a longitudinal axis of said stud.
Claim 10
Dependent Claim
25 words
A drill bit according to claim 6, wherein said supporting surface is oriented at an acute angle relative to a longitudinal axis of said stud.
Claim 11
Dependent Claim
24 words
A drill bit according to claim 6, wherein said projections and grooves of said supporting surface extend forwardly all the way to said edge.
Claim 12
Dependent Claim
14 words
A drill bit according to claim 6, wherein said projections are of V-shaped cross-section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |