Patent JPS62266518A successfully refreshed from Google Patents.
US4254840A
Expired / Lapsed
US
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Drill bit insert
Assignee: Reed Tool Co
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Filing: 1978-10-05
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Granted: 1981-03-10
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Expires: 1998-10-05
Abstract
Abstract A protruding insert for use in an oil well drill bit is disclosed which insert is made of a hard metal substance and utilizes a tangential spherical surface having opposed flattened sides.
Inventors
- 👤 William Shay, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:21
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
An insert for a drilling bit, said insert comprising: a body having a generally cylindrical base section adapted for snug-fitting engagement in a rolling cutter; and, a protruding end on said body, said end having a substantially frusto-conical lower portion adjacent said cylindrical base section, a tangential, substantially hemispherical end portion formed on said frusto-conical portion, and flats formed on opposing sides of said hemispherical end portion in generally converging orientation.
Claim 2
Dependent Claim
71 words
An insert for a drilling bit, said insert comprising: a body having a generally cylindrical base section adapted for snug-fitting engagement in a rolling cutter; and, a protruding end on said body, said end having a substantially frusto-conical lower portion adjacent said cylindrical base section, a tangential, substantially hemispherical end portion formed on said frusto-conical portion, and flats formed on opposing sides of said hemispherical end portion in generally converging orientation.
Claim 3
Dependent Claim
58 words
The drilling bit insert of claim 1 wherein said hemispherical end portion has a radius of curvature substantially equal to the radius of said frusto-conical portion at the point of intersection of said two portions, and the slope of said frusto-conical portion is about thirty degrees inward from a vertical line extending upward from said cylindrical base section.
Claim 4
Dependent Claim
31 words
The drilling bit insert of claim 3 wherein said flats are formed at an angle of about 45 degrees inward from a vertical line extending upward from said cylindrical base section.
Claim 5
Dependent Claim
31 words
The drilling bit insert of claims 2 or 3 wherein said end portion between said flats is formed at a radius sufficiently small enough to intersect said flats on a tangent.
Claim 6
Dependent Claim
75 words
An insert for a drilling bit, said insert comprising: a body having a generally cylindrical base section adapted for snug-fitting engagement in a rolling cutter; and, a protruding portion on said body; said protruding portion having a substantially frusto-conical lower section adjacent said cylindrical base section, a compound hemispherical end portion tangential to said lower section, and opposed flats on said end portion in generally converging orientation and tangential to said compound hemispherical end portion.
Claim 7
Dependent Claim
75 words
An insert for a drilling bit, said insert comprising: a body having a generally cylindrical base section adapted for snug-fitting engagement in a rolling cutter; and, a protruding portion on said body; said protruding portion having a substantially frusto-conical lower section adjacent said cylindrical base section, a compound hemispherical end portion tangential to said lower section, and opposed flats on said end portion in generally converging orientation and tangential to said compound hemispherical end portion.
Claim 8
Dependent Claim
52 words
A drill bit insert consisting essentially of a cylindrical base section, a frusto-conical intermediate section joining said base section, a curved end section joining said intermediate section, and opposed flats on said end section; said curved end section have a compound circular configuration tangential to said intermediate section and said opposed flats.
Claim 9
Dependent Claim
52 words
A drill bit insert consisting essentially of a cylindrical base section, a frusto-conical intermediate section joining said base section, a curved end section joining said intermediate section, and opposed flats on said end section; said curved end section have a compound circular configuration tangential to said intermediate section and said opposed flats.
References Cited (Backward Citations)
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |