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Patent US4235295A successfully refreshed from Google Patents.
US4235295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring bit with renewable bearing surface
Assignee: Dresser Industries Inc
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Filing: 1979-03-05
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Granted: 1980-11-25
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Expires: 1999-03-05
Abstract
Abstract A rolling cone cutter earth boring bit is provided with a load carrying bearing surface that can be renewed during the earth boring operation. A canister bearing element is positioned between the bearing pin and the rolling cone cutter. The rolling cone cutter rotates about the canister bearing element in a first direction during normal drilling operations. The canister bearing element has directional stops on its inside surface. These directional stops engage directional stops on the bearing pin and prevent rotation of the canister bearing element during normal drilling operations. The bearing surface can be renewed by reversing the direction of cutter rotation thereby disengaging the canister bearing element from the directional stops and allowing it to rotate in the opposite direction until a new bearing surface is in the load area. The new surface is locked in place by the directional stops or independent means and the rolling cone cutter again is rotated in the first direction for normal drilling operation.
Inventors
- 👤 Steve W. Zyglewyz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:02
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/20; E21B10/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
In an earth boring bit having a bit body with a bearing pin extending from said bit body and a rolling cutter mounted for rotation about said bearing pin, the improvement comprising: a bearing element located between said bearing pin and said rolling cutter and means for selectively locking said bearing element to one of said bearing pin and rolling cutter for selectively allowing said bearing element to rotate and be locked to one of said bearing pin and rolling cutter.
Claim 2
Dependent Claim
81 words
In an earth boring bit having a bit body with a bearing pin extending from said bit body and a rolling cutter mounted for rotation about said bearing pin, the improvement comprising: a bearing element located between said bearing pin and said rolling cutter and means for selectively locking said bearing element to one of said bearing pin and rolling cutter for selectively allowing said bearing element to rotate and be locked to one of said bearing pin and rolling cutter.
Claim 3
Dependent Claim
71 words
In an earth boring bit having a bit body with a bearing pin extending from said bit body and a rolling cone cutter rotatably mounted upon said bearing pin, the improvement comprising: a bearing element positioned between said bearing pin and said rolling cone cutter and means for selectively locking said bearing element to said bearing pin and for selectively allowing said bearing element to rotate relative to said bearing pin.
Claim 4
Dependent Claim
71 words
In an earth boring bit having a bit body with a bearing pin extending from said bit body and a rolling cone cutter rotatably mounted upon said bearing pin, the improvement comprising: a bearing element positioned between said bearing pin and said rolling cone cutter and means for selectively locking said bearing element to said bearing pin and for selectively allowing said bearing element to rotate relative to said bearing pin.
Claim 5
Dependent Claim
74 words
An earth boring bit, comprising: a bit body; a bearing pin extending from said bit body; a rolling cutter rotatably mounted on said bearing pin; an annular bearing member positioned between said bearing pin and said rolling cutter; directional stop means on one of said bearing pin and said rolling cutter; and directional stop means on said annular bearing member for engaging said stop means on one of said bearing pin and rolling cutter.
Claim 6
Dependent Claim
74 words
An earth boring bit, comprising: a bit body; a bearing pin extending from said bit body; a rolling cutter rotatably mounted on said bearing pin; an annular bearing member positioned between said bearing pin and said rolling cutter; directional stop means on one of said bearing pin and said rolling cutter; and directional stop means on said annular bearing member for engaging said stop means on one of said bearing pin and rolling cutter.
Claim 7
Dependent Claim
54 words
An earth boring bit, comprising: a bit body; a bearing pin extending from said bit body; a rolling cutter rotatably mounted on said bearing pin; an annular bearing member positioned between said bearing pin and said rolling cutter; directional stop means on said bearing pin; and directional stop means on said annular bearing member.
Claim 8
Dependent Claim
54 words
An earth boring bit, comprising: a bit body; a bearing pin extending from said bit body; a rolling cutter rotatably mounted on said bearing pin; an annular bearing member positioned between said bearing pin and said rolling cutter; directional stop means on said bearing pin; and directional stop means on said annular bearing member.
Claim 9
Dependent Claim
127 words
An earth boring bit, comprising: an earth boring bit body; at least one bearing pin extending from said earth boring bit body, said bearing pin having a radial thrust bearing surface with directional stop means on said radial thrust bearing surface; a rolling cone cutter mounted over said bearing pin, said rolling cone cutter having a radial thrust bearing surface aligned with said radial thrust bearing surface of said bearing pin; and a canister bearing member rotatably positioned between said bearing pin and said rolling cone cutter, said canister bearing member having a radial thrust bearing surface opposing said radial thrust bearing surface on said bearing pin with directional stop means that engage said directional stop means on said radial thrust bearing surface of said bearing pin.
Claim 10
Dependent Claim
127 words
An earth boring bit, comprising: an earth boring bit body; at least one bearing pin extending from said earth boring bit body, said bearing pin having a radial thrust bearing surface with directional stop means on said radial thrust bearing surface; a rolling cone cutter mounted over said bearing pin, said rolling cone cutter having a radial thrust bearing surface aligned with said radial thrust bearing surface of said bearing pin; and a canister bearing member rotatably positioned between said bearing pin and said rolling cone cutter, said canister bearing member having a radial thrust bearing surface opposing said radial thrust bearing surface on said bearing pin with directional stop means that engage said directional stop means on said radial thrust bearing surface of said bearing pin.
Claim 11
Dependent Claim
23 words
The earth boring bit of claim 5 wherein said directional stop means on said bearing pin and canister bearing member provide axial adjustment.
Claim 12
Dependent Claim
125 words
A journal bearing rotary rock bit, comprising: a bit body; a bearing pin extending from said bit body; a rolling cone cutter mounted over said bearing pin; a canister bearing element between said bearing pin and said rolling cone cutter; matched radial surfaces on said bearing pin and canister bearing element known as thrust bearing surfaces, one of said radial surfaces being the radial surface of the bearing pin known as the bearing pin inner flange and the matching radial surface in the canister bearing element being known as the canister inner flange; directional stop means in the bearing pin inner flange and the canister inner flange that engage to selectively allow relative rotation in one direction but prevent relative rotation in the opposite direction.
Claim 13
Dependent Claim
125 words
A journal bearing rotary rock bit, comprising: a bit body; a bearing pin extending from said bit body; a rolling cone cutter mounted over said bearing pin; a canister bearing element between said bearing pin and said rolling cone cutter; matched radial surfaces on said bearing pin and canister bearing element known as thrust bearing surfaces, one of said radial surfaces being the radial surface of the bearing pin known as the bearing pin inner flange and the matching radial surface in the canister bearing element being known as the canister inner flange; directional stop means in the bearing pin inner flange and the canister inner flange that engage to selectively allow relative rotation in one direction but prevent relative rotation in the opposite direction.
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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |