US4232912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring bit with gridded ferrous bearing surface
Assignee: Dresser Industries Inc
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Filing: 1978-12-11
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Granted: 1980-11-11
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Expires: 1998-12-11
Abstract
Abstract A rolling cone cutter earth boring bit is provided with a bearing surface having a substantial amount of anti-galling material throughout the load area of the bearing. A rough machined bearing surface is provided with either a male or female gridded surface through the use of a fine-toothed knurling tool. Anti-galling material is applied to the gridded surface. The bearing is heat treated by conventional quench and temper procedures to provide strength to the ferrous alloy; however, special heat treating and/or carburizing is not required. Excess anti-galling material is removed by machining and/or grinding the bearing surface until a network or grid of the ferrous material is clearly discernible. The bearing provides adequate support for applied loads and substantial amounts of anti-galling material for boundary layer lubrication situations in close proximity to the load bearing area.
Inventors
- 👤 Robert L. Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:42
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/24; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; F16C2352/00; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/912
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A rolling cone cutter earth boring bit, comprising: a bit body, said bit body having at least one downwardly extending arm; a cantilevered bearing pin of ferrous alloy extending from said arm; a rolling cone cutter of ferrous alloy adapted to be rotatably mounted on said bearing pin; bearing and cutter retaining means between said bearing pin and said cone cutter; a quenched and tempered ferrous alloy bearing surface between said rolling cone cutter and said bearing pin; a quantity of knurls and indentations on said bearing surface; and a layer of anti-galling material overlying said bearing surface.
Claim 2
Dependent Claim
98 words
A rolling cone cutter earth boring bit, comprising: a bit body, said bit body having at least one downwardly extending arm; a cantilevered bearing pin of ferrous alloy extending from said arm; a rolling cone cutter of ferrous alloy adapted to be rotatably mounted on said bearing pin; bearing and cutter retaining means between said bearing pin and said cone cutter; a quenched and tempered ferrous alloy bearing surface between said rolling cone cutter and said bearing pin; a quantity of knurls and indentations on said bearing surface; and a layer of anti-galling material overlying said bearing surface.
Claim 3
Dependent Claim
16 words
The rolling cone cutter earth boring bit of claim 1 wherein said bearing surface is uncarburized.
Claim 4
Dependent Claim
92 words
A rolling cone cutter earth boring bit, comprising: a bit body, said bit body having at least one downwardly extending arm; a ferrous alloy cantilevered bearing pin extending from said arm; a ferrous alloy rolling cone cutter adapted to be rotatably mounted on said bearing pin; bearing and cutter retaining means between said bearing pin and said cone cutter; a quenched and tempered ferrous alloy bearing surface in said rolling cone cutter; a quantity of knurls and indentations on said bearing surface; and a layer of anti-galling material overlying said bearing surface.
Claim 5
Dependent Claim
92 words
A rolling cone cutter earth boring bit, comprising: a bit body, said bit body having at least one downwardly extending arm; a ferrous alloy cantilevered bearing pin extending from said arm; a ferrous alloy rolling cone cutter adapted to be rotatably mounted on said bearing pin; bearing and cutter retaining means between said bearing pin and said cone cutter; a quenched and tempered ferrous alloy bearing surface in said rolling cone cutter; a quantity of knurls and indentations on said bearing surface; and a layer of anti-galling material overlying said bearing surface.
Claim 6
Dependent Claim
16 words
The rolling cone cutter earth boring bit of claim 3 wherein said bearing surface is uncarburized.
References Cited (Backward Citations)
US3235316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |