US3720274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring bit thrust bearing
Assignee: Dresser Industries Inc
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Filing: 1971-05-21
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Granted: 1973-03-13
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Expires: 1991-05-21
Abstract
Abstract Intermediate thrust elements are positioned between the cutters and the bearing pins of an earth boring bit. Each intermediate thrust element is located between a thrust surface on a bearing pin and a thrust surface on the associated cutter. The intermediate thrust elements aid stabilization of the rotating cutter, promote cutter rotation and extend the lifetime of the bit.
Inventors
- 👤 Callum H Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:01
CPC Classifications
F; F16; F16C; F16C21/00; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/23; F16C2352/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
202 words
An earth boring bit, comprising: a bit body having an upper end connectable with a rotary drill string; at least one bearing pin extending from said bit body, said bearing pin having a first portion with a first diameter, a second portion with a second diameter, said second diameter being smaller than said first diameter, and a bearing pin thrust surface between said first portion and said second portion; a Cutter member rotatably positioned on said bearing pin, said cutter member having a first inner portion with a diameter larger than said bearing pin first diameter and a second inner portion with a diameter smaller than said bearing pin first diameter but larger than said bearing pin second diameter, with a cutter member thrust surface on the inner portion of said cutter member between said first inner portion and said second inner portion; bearing means between said bearing pin and said cutter member for promoting rotation of said cutter member; and an intermediate element positioned between said bearing pin thrust surface and said cutter member thrust surface, said intermediate element having a first thrust surface opposite said bearing pin thrust surface and a second thrust surface opposite said cutter member thrust surface.
Claim 2
Dependent Claim
202 words
An earth boring bit, comprising: a bit body having an upper end connectable with a rotary drill string; at least one bearing pin extending from said bit body, said bearing pin having a first portion with a first diameter, a second portion with a second diameter, said second diameter being smaller than said first diameter, and a bearing pin thrust surface between said first portion and said second portion; a Cutter member rotatably positioned on said bearing pin, said cutter member having a first inner portion with a diameter larger than said bearing pin first diameter and a second inner portion with a diameter smaller than said bearing pin first diameter but larger than said bearing pin second diameter, with a cutter member thrust surface on the inner portion of said cutter member between said first inner portion and said second inner portion; bearing means between said bearing pin and said cutter member for promoting rotation of said cutter member; and an intermediate element positioned between said bearing pin thrust surface and said cutter member thrust surface, said intermediate element having a first thrust surface opposite said bearing pin thrust surface and a second thrust surface opposite said cutter member thrust surface.
Claim 3
Dependent Claim
202 words
An earth boring bit, comprising: a bit body having an upper end connectable with a rotary drill string; at least one bearing pin extending from said bit body, said bearing pin having a first portion with a first diameter, a second portion with a second diameter, said second diameter being smaller than said first diameter, and a bearing pin thrust surface between said first portion and said second portion; a Cutter member rotatably positioned on said bearing pin, said cutter member having a first inner portion with a diameter larger than said bearing pin first diameter and a second inner portion with a diameter smaller than said bearing pin first diameter but larger than said bearing pin second diameter, with a cutter member thrust surface on the inner portion of said cutter member between said first inner portion and said second inner portion; bearing means between said bearing pin and said cutter member for promoting rotation of said cutter member; and an intermediate element positioned between said bearing pin thrust surface and said cutter member thrust surface, said intermediate element having a first thrust surface opposite said bearing pin thrust surface and a second thrust surface opposite said cutter member thrust surface.
Claim 4
Dependent Claim
202 words
An earth boring bit, comprising: a bit body having an upper end connectable with a rotary drill string; at least one bearing pin extending from said bit body, said bearing pin having a first portion with a first diameter, a second portion with a second diameter, said second diameter being smaller than said first diameter, and a bearing pin thrust surface between said first portion and said second portion; a Cutter member rotatably positioned on said bearing pin, said cutter member having a first inner portion with a diameter larger than said bearing pin first diameter and a second inner portion with a diameter smaller than said bearing pin first diameter but larger than said bearing pin second diameter, with a cutter member thrust surface on the inner portion of said cutter member between said first inner portion and said second inner portion; bearing means between said bearing pin and said cutter member for promoting rotation of said cutter member; and an intermediate element positioned between said bearing pin thrust surface and said cutter member thrust surface, said intermediate element having a first thrust surface opposite said bearing pin thrust surface and a second thrust surface opposite said cutter member thrust surface.
Claim 5
Dependent Claim
22 words
The earth boring bit of claim 1 wherein the first and second thrust surfaces of said intermediate element have wear resistant characteristics.
Claim 6
Dependent Claim
21 words
The earth boring bit of claim 1 wherein the first and second thrust surfaces of said intermediate element have anti-galling characteristics.
Claim 7
Dependent Claim
29 words
The earth boring bit of claim 1 wherein the first and second thrust surfaces of said intermediate element have areas with wear resistant characteristics and areas with anti-galling characteristics.
Claim 8
Dependent Claim
19 words
The earth boring bit of claim 1 wherein said intermediate element is constructed from a material having anti-galling characteristics.
Claim 9
Dependent Claim
22 words
The earth boring bit of claim 1 wherein said intermediate element includes materials with wear resistant characteristics and materials with anti-galling characteristics.
Claim 10
Dependent Claim
31 words
The earth boring bit of claim 1 wherein the intermediate thrust element is constructed from a material selected from the group consisting of hardened steel, hardened aluminum bronze and tungsten carbide.
Claim 11
Dependent Claim
33 words
The earth boring bit of claim 1 wherein the intermediate thrust element is constructed from a material selected from the group consisting of carburized stainless steel, hardened alloy steel and hardened tool steel.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |