Patent US3890018A successfully refreshed from Google Patents.
US3890018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary rock bit with wiper pad lubrication system
Assignee: Dresser Industries Inc
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Filing: 1974-07-19
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Granted: 1975-06-17
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Expires: 1994-07-19
Abstract
Abstract A system is provided for circulating lubricant into the loaded contact area between the bearing pin and the rotating cutter of an earth boring bit. The cutter is mounted to rotate about the bearing pin. The cutter includes a cutter interior surface. At least one wiper pad cavity is located in the aforementioned interior surface of the cutter. A wiper pad is positioned in the wiper pad cavity and a resilient member is positioned beneath the wiper pad. As the cutter rotates, the wiper pad forces lubricant into the load area between the bearing pin and the interior surface of the cutter.
Inventors
- 👤 Robert Dale Clamon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:01
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/103; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/24; E21B10/246; F16C2352/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A rotary rock bit comprising: a bit body including a bearing pin; a rotatable cutter mounted upon said bearing pin, said rotatable cutter having a cutter interior surface; at least one wiper pad cavity in said cutter interior surface; and a wiper pad positioned in said wiper pad cavity.
Claim 2
Dependent Claim
49 words
A rotary rock bit comprising: a bit body including a bearing pin; a rotatable cutter mounted upon said bearing pin, said rotatable cutter having a cutter interior surface; at least one wiper pad cavity in said cutter interior surface; and a wiper pad positioned in said wiper pad cavity.
Claim 3
Dependent Claim
32 words
The rotary rock bit of claim 1 including resilient means positioned within said wiper pad cavity for providing a force tending to push said wiper pad out of said wiper pad cavity.
Claim 4
Dependent Claim
30 words
The rotary rock bit of claim 2 including seal means between said bit body and said rotatable cutter for providing a seal between said rotatable cutter and said bit body.
Claim 5
Dependent Claim
47 words
A rotary rock bit comprising: a bit body; a bearing pin extending from said bit body; a rotatable cutter mounted upon said bearing pin; an interior surface on said rotatable cutter; at least one groove in said interior surface; and a wiper pad positioned in said groove.
Claim 6
Dependent Claim
47 words
A rotary rock bit comprising: a bit body; a bearing pin extending from said bit body; a rotatable cutter mounted upon said bearing pin; an interior surface on said rotatable cutter; at least one groove in said interior surface; and a wiper pad positioned in said groove.
Claim 7
Dependent Claim
23 words
The rotary rock bit of claim 4 including resilient means positioned in said groove for urging said wiper pad out of said groove.
Claim 8
Dependent Claim
95 words
A rotary rock bit comprising: a bit body, said bit body including at least one bearing pin; a rotatable cone cutter mounted upon said bearing pin, said rotatable cone cutter having a cutter interior surface; seal means between said bit body and said rotatable cone cutter for providing a seal between said rotatable cone cutter and said bit body; at least one wiper pad cavity in said cutter interior surface; a wiper pad positioned in said wiper pad cavity; and resilient means positioned within said wiper pad cavity between said wiper pad and said cutter.
Claim 9
Dependent Claim
95 words
A rotary rock bit comprising: a bit body, said bit body including at least one bearing pin; a rotatable cone cutter mounted upon said bearing pin, said rotatable cone cutter having a cutter interior surface; seal means between said bit body and said rotatable cone cutter for providing a seal between said rotatable cone cutter and said bit body; at least one wiper pad cavity in said cutter interior surface; a wiper pad positioned in said wiper pad cavity; and resilient means positioned within said wiper pad cavity between said wiper pad and said cutter.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |