US4381824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit lubrication system
Assignee: REED ROCK BIT COMPANY A CORP OF TX
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Filing: 1980-10-03
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Granted: 1983-05-03
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Expires: 2000-10-03
Abstract
Abstract A lubrication system is disclosed for a rolling cutter drill bit, which system utilizes solid or semi-solid sticks of lubricants located in internal channels and continuously biased against rotating surfaces in the bit.
Inventors
- 👤 Paul E. Pastusek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:14
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/102; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/24; E21B10/246; F16C33/1025; F16C33/103; F16C33/30; F16C33/66; F16C33/6603; F16C33/6622; F16C33/6696; F16N; F16N15/00; F16C2352/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
In a non-sealed rolling cutter drill bit having at least one bearing journal shaft and a rolling cutter rotatably mounted on the shaft and having at least one flat interior end face in rotary bearing contact with the end of said bearing journal shaft to support end thrust loads, the improvement comprising: at least one lubricant rod slidably mounted in said shaft for longitudinal movement therein and arranged to contact said flat interior end face of said rolling cutter; and, biasing means associated with said lubricating rod and arranged to urge said rod against said flat interior end face during rotation of said rolling cutter to lubricate the end thrust bearing surfaces thereof.
Claim 2
Dependent Claim
113 words
In a non-sealed rolling cutter drill bit having at least one bearing journal shaft and a rolling cutter rotatably mounted on the shaft and having at least one flat interior end face in rotary bearing contact with the end of said bearing journal shaft to support end thrust loads, the improvement comprising: at least one lubricant rod slidably mounted in said shaft for longitudinal movement therein and arranged to contact said flat interior end face of said rolling cutter; and, biasing means associated with said lubricating rod and arranged to urge said rod against said flat interior end face during rotation of said rolling cutter to lubricate the end thrust bearing surfaces thereof.
Claim 3
Dependent Claim
21 words
The drill bit of claim 1 wherein said lubricating rod is slidably located in a bore passage in said journal shaft.
Claim 4
Dependent Claim
27 words
The drill bit of claim 1 or 2 wherein said rod comprises a generally solid lubricant selected from the group of graphite, molybdenum disulfide, and soft metal.
Claim 5
Dependent Claim
17 words
The drill bit of claims 1 or 2 wherein said biasing means comprises a resilient biasing member.
Claim 6
Dependent Claim
18 words
The drill bit of claims 1 or 2 wherein said biasing means comprises a pressurized fluid biasing system.
Claim 7
Dependent Claim
139 words
A rolling cutter drill bit having a plurality of downwardly extending lugs, each having a cantilevered bearing journal extending downwardly therefrom, and a rolling cutter rotatably mounted on each said bearing journal by bearing means and having at least one flat interior end face in rotary bearing contact with the end of said bearing journal to provide an end bearing for supporting end thrust loads, the improvement comprising at least one bore passage formed in said bearing journal and communicating with the end thereof; a lubrication stick slidably located in said bore passage and arranged to contact said flat interior end face of said rolling cutter, and, biasing means arranged to bias said lubrication stick out of said passage against said flat interior end face during rotation of said rolling cutter to lubricate the end thrust bearing surfaces thereof.
Claim 8
Dependent Claim
139 words
A rolling cutter drill bit having a plurality of downwardly extending lugs, each having a cantilevered bearing journal extending downwardly therefrom, and a rolling cutter rotatably mounted on each said bearing journal by bearing means and having at least one flat interior end face in rotary bearing contact with the end of said bearing journal to provide an end bearing for supporting end thrust loads, the improvement comprising at least one bore passage formed in said bearing journal and communicating with the end thereof; a lubrication stick slidably located in said bore passage and arranged to contact said flat interior end face of said rolling cutter, and, biasing means arranged to bias said lubrication stick out of said passage against said flat interior end face during rotation of said rolling cutter to lubricate the end thrust bearing surfaces thereof.
Claim 9
Dependent Claim
34 words
The drill bit of claim 6 wherein said biasing means comprises a spring and said lubrication stick comprises a generally solid lubricant selected from the group of graphite, molybdenum disulfide and a soft metal.
Claim 10
Dependent Claim
37 words
The drill bit of claim 6 wherein said biasing means comprises a pressurized fluid biasing system and said lubrication stick comprises a generally solid lubricant selected from the group of graphite, molybdenum disulfide and a soft metal.
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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) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |