US4105263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Journal and pilot bearings with alternating surface areas of wear resistant and anti-galling materials
Assignee: Dresser Industries Inc
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Filing: 1976-07-19
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Granted: 1978-08-08
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Expires: 1996-07-19
Abstract
Abstract The journal and/or pilot bearings of a rotary cone earth boring bit are constructed to include alternating areas of wear resistant materials and anti-galling materials. The bearing matrix is formed by compressing a powdered alloy in the shape of the desired bearing element. The bearing matrix is sintered, thereby forming a porous bearing element. An anti-galling material is infiltrated into the porous matrix of the bearing element and the bearing element is hardened. The resulting bearing element includes areas of wear resistant materials and areas of anti-galling materials.
Inventors
- 👤 Robert K. Sorensen
- 👤 Anthony T. Rallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:03
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C33/122; F16C33/14; F16C2220/00; F16C2220/20; F16C2223/00; F16C2223/10; F16C2223/12; F16C2352/00; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/902; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49647; Y10T29/49668; Y10T29/49707
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A bearing element, comprising: a bearing shaft, a rotatable member mounted on said bearing shaft, a bearing element between said bearing shaft andsaid rotatable member, said bearing element having an uninterrupted matrix of pressed porous sintered ferrous alloy powder, said matrix having a surface, and an anti-galling metal infiltrated into said pressed porous sintered ferrous alloy powder matrix substantially deeper than said surface and extending substantially throughout the entire matrix.
Claim 2
Dependent Claim
70 words
A bearing element, comprising: a bearing shaft, a rotatable member mounted on said bearing shaft, a bearing element between said bearing shaft andsaid rotatable member, said bearing element having an uninterrupted matrix of pressed porous sintered ferrous alloy powder, said matrix having a surface, and an anti-galling metal infiltrated into said pressed porous sintered ferrous alloy powder matrix substantially deeper than said surface and extending substantially throughout the entire matrix.
Claim 3
Dependent Claim
25 words
The bearing element of claim 1 wherein said matrix includes a multiplicity of interconnected pores with said matrix having a theoretical density of approximately 85-87%.
Claim 4
Dependent Claim
20 words
The bearing element of claim 1 wherein said matrix is case hardened thereby providing said matrix with a hard surface.
Claim 5
Dependent Claim
31 words
The bearing element of claim 3 wherein said surface has an apparent hardness greater than Rockwell C 40 and the matrix has an apparent hardness of greater than Rockwell C 20.
Claim 6
Dependent Claim
20 words
The bearing element of claim 4 wherein said matrix has a carbon content within the range of .04% to 1.5%.
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) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |