US3841422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic rock bit lubrication system
Assignee: Dresser Industries Inc
•
Filing: 1973-10-23
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Granted: 1974-10-15
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Expires: 1993-10-23
Abstract
Abstract Lubricant is circulated from a lubricant reservoir to the bearings of a rotary rock bit and back to the lubricant reservoir by a lubricant circulation system that is operated by movement of the cone cutter upon the bearing pin of the bit. A positive seal is positioned between the rolling cone cutter and the arm of the bit to maintain lubricant in the bearing area and to prevent fluid in the borehole from entering the bearing area. A lubricant reservoir is located in the bit body. A first passage connects the lubricant reservoir with the bearing area to channel lubricant from the lubricant reservoir to the bearing area. A second passage extends from the bearing area to the lubricant reservoir to allow lubricant to be channeled back to the lubricant reservoir. A check valve in at least one of said passages insures one-way flow of lubricant. Axial movement of the cone cutter on the bearing pin provides a pumping action to circulate lubricant from the lubricant reservoir through said first passage to the bearing area and from the bearing area through said second passage back to said lubricant reservoir.
Inventors
- 👤 Crow M Levon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:09
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/24; E21B10/246
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
In an earth boring bit including a bit body with a bearing pin extending from said bit body, a rotatably cutter mounted upon said bearing pin, bearing means between said bearing pin and said cutter, and a lubricant circulation system, comprising: a lubricant reservoir in said bit body; first passage means for channeling lubricant from said lubricant reservoir to said bearing means; second passage means for channeling lubricant from said bearing means to said lubricant reservoir; valve means for providing one-way flow of lubricant in said first passage means and said second passage means, and seal means between said cutter and said bit body for providing a positive seal between said cutter and said bit body.
Claim 2
Dependent Claim
116 words
In an earth boring bit including a bit body with a bearing pin extending from said bit body, a rotatably cutter mounted upon said bearing pin, bearing means between said bearing pin and said cutter, and a lubricant circulation system, comprising: a lubricant reservoir in said bit body; first passage means for channeling lubricant from said lubricant reservoir to said bearing means; second passage means for channeling lubricant from said bearing means to said lubricant reservoir; valve means for providing one-way flow of lubricant in said first passage means and said second passage means, and seal means between said cutter and said bit body for providing a positive seal between said cutter and said bit body.
Claim 3
Dependent Claim
16 words
The earth boring bit of claim 1 wherein said seal means is an O ring seal.
Claim 4
Dependent Claim
198 words
A rotary rock bit for drilling in a borehole filled with fluid, comprising: a bit body, said bit body including at least one bearing pin extending from said bit body, said bearing pin having a bearing pin exterior surface; a rotatable cutter mounted upon said bearing pin for rotational movement and a limited amount of axial movement, said rotatable cutter having a cutter interior surface; seal means between said bit body and said rotatable cutter for providing a positive seal between said cutter and said bit body; bearing means between said bearing pin and said cutter for promoting rotation of said rotatable cutter; a lubricant reservoir in said bit body, said lubricant reservoir containing lubricant; first passage means for channeling lubricant from said lubricant reservoir to said bearing means; second passage means for channeling lubricant from said bearing means to said lubricant reservoir; valve means for providing one-way flow of lubricant in said first and said second passage means; and pump means for pumping lubricant through said passage means, said pump means consisting of said bearing pin exterior surface and said rotatable cutter interior surface acting upon said lubricant in response to axial movement of said rotatable cutter.
Claim 5
Dependent Claim
198 words
A rotary rock bit for drilling in a borehole filled with fluid, comprising: a bit body, said bit body including at least one bearing pin extending from said bit body, said bearing pin having a bearing pin exterior surface; a rotatable cutter mounted upon said bearing pin for rotational movement and a limited amount of axial movement, said rotatable cutter having a cutter interior surface; seal means between said bit body and said rotatable cutter for providing a positive seal between said cutter and said bit body; bearing means between said bearing pin and said cutter for promoting rotation of said rotatable cutter; a lubricant reservoir in said bit body, said lubricant reservoir containing lubricant; first passage means for channeling lubricant from said lubricant reservoir to said bearing means; second passage means for channeling lubricant from said bearing means to said lubricant reservoir; valve means for providing one-way flow of lubricant in said first and said second passage means; and pump means for pumping lubricant through said passage means, said pump means consisting of said bearing pin exterior surface and said rotatable cutter interior surface acting upon said lubricant in response to axial movement of said rotatable cutter.
Claim 6
Dependent Claim
16 words
The rotary rock bit of claim 3 wherein said seal means is an O ring seal.
References Cited (Backward Citations)
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |