Patent US2448078A successfully refreshed from Google Patents.
Patent US3984158A successfully refreshed from Google Patents.
US3984158A
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: 1973-09-10
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Granted: 1976-10-05
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Expires: 1993-09-10
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 Keith Sorensen
- 👤 Anthony T. Rallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:13
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: 12
Claim 1
Independent Claim
71 words
In a rotary rock bit with at least one bearing pin and a rotatable cutter mounted on said bearing pin, the improvement comprising a bearing element between said rotatable cutter and said bearing pin, said bearing element having a matrix of pressed porous sintered ferrous alloy powder, said matrix having a surface, and an anti-galling material infiltrated into said pressed porous sintered ferrous alloy powder matrix substantially deeper than said surface.
Claim 2
Dependent Claim
71 words
In a rotary rock bit with at least one bearing pin and a rotatable cutter mounted on said bearing pin, the improvement comprising a bearing element between said rotatable cutter and said bearing pin, said bearing element having a matrix of pressed porous sintered ferrous alloy powder, said matrix having a surface, and an anti-galling material infiltrated into said pressed porous sintered ferrous alloy powder matrix substantially deeper than said surface.
Claim 3
Dependent Claim
26 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 percent.
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
22 words
The bearing element of claim 4 wherein said matrix has a carbon content within the range of 0.04 percent to 1.5 percent.
Claim 7
Dependent Claim
84 words
A rotary rock bit, comprising: a body; a bearing shaft supported by said body; a rotary cutter adapted to be rotatably mounted on said bearing shaft. a bearing that promotes rotation between said rotary cutter and said bearing shaft, said bearing including a bearing element having a matrix of pressed porous sintered ferrous alloy powder and an anti-galling material infiltrated into said pressed porous sintered ferrous alloy powder matrix throughout substantially all of said matrix and extending throughout substantially all of said bearing element.
Claim 8
Dependent Claim
84 words
A rotary rock bit, comprising: a body; a bearing shaft supported by said body; a rotary cutter adapted to be rotatably mounted on said bearing shaft. a bearing that promotes rotation between said rotary cutter and said bearing shaft, said bearing including a bearing element having a matrix of pressed porous sintered ferrous alloy powder and an anti-galling material infiltrated into said pressed porous sintered ferrous alloy powder matrix throughout substantially all of said matrix and extending throughout substantially all of said bearing element.
Claim 9
Dependent Claim
14 words
The bearing element of claim 6 wherein said matrix is a case hardened matrix.
Claim 10
Dependent Claim
141 words
A rotary rock bit, comprising: a head defining an internal chamber; a bearing pin depending from said head; a cone cutter adapted to be mounted on said bearing pin, said cone cutter having a concave cavity projecting from a cone mouth, said cavity and cone mouth positioned over said bearing pin; A seal element between said cone cutter and said bearing pin; a lubricant reservoir in said lubricant reservoir containing lubricant; a first passage through said head and said bearing pin communicating from said lubricant reservoir to said cavity; and a bearing element located in said cavity supporting said cone cutter for rotation about said bearing pin, said bearing element having a matrix of pressed porous sintered ferrous alloy powder and an anti-galling material infiltrated into said pressed porous sintered ferrous alloy powder matrix throughout substantially all of said bearing element.
Claim 11
Dependent Claim
141 words
A rotary rock bit, comprising: a head defining an internal chamber; a bearing pin depending from said head; a cone cutter adapted to be mounted on said bearing pin, said cone cutter having a concave cavity projecting from a cone mouth, said cavity and cone mouth positioned over said bearing pin; A seal element between said cone cutter and said bearing pin; a lubricant reservoir in said lubricant reservoir containing lubricant; a first passage through said head and said bearing pin communicating from said lubricant reservoir to said cavity; and a bearing element located in said cavity supporting said cone cutter for rotation about said bearing pin, said bearing element having a matrix of pressed porous sintered ferrous alloy powder and an anti-galling material infiltrated into said pressed porous sintered ferrous alloy powder matrix throughout substantially all of said bearing element.
Claim 12
Dependent Claim
14 words
The bearing element of claim 8 wherein said matrix is a case hardened matrix.
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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |