US3761145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal means for drill bit bearings
Assignee: GW Murphy Industries Inc
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Filing: 1972-03-06
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Granted: 1973-09-25
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Expires: 1992-03-06
Abstract
Abstract A drill bit including a roller cutter mounted on a greased bearing journal having a grease seal ring therearound and resilient means mounted between the seal ring and bearing journal to urge the seal ring against a sealing surface on the cutter in such a manner that the seal ring may be forced away from the cutter surface by some predetermined pressure from within the cutter but wherein the seal ring arrangement provides a substantially positive seal from pressures externally of the cutter to prevent detritus or other foreign material from entering into the bearing area interiorly of the drill bit cutter. Elastomeric material may be provided between the seal ring and the cutter sealing surface. The abstract is neither intended to define the invention of the application which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
Inventors
- 👤 P Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:24
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/25; F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/78; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/344; F16C2352/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A roller cutter earth boring bit comprising: a bearing shaft arranged on said bit, a roller cutter mounted on said shaft, a seal ring encircling said shaft, the seal ring having a contoured surface and a sealing face, a sealing surface on said cutter, resilient means between the shaft and the seal ring, said resilient means being in frictional contact with said seal ring and shaft to insure that said resilient ring and seal ring will not rotate, said resilient means coacting with the shaft and and contoured surface of said seal ring to bias the seal ring face into sealing engagement with the sealing surface on said cutter.
Claim 2
Dependent Claim
109 words
A roller cutter earth boring bit comprising: a bearing shaft arranged on said bit, a roller cutter mounted on said shaft, a seal ring encircling said shaft, the seal ring having a contoured surface and a sealing face, a sealing surface on said cutter, resilient means between the shaft and the seal ring, said resilient means being in frictional contact with said seal ring and shaft to insure that said resilient ring and seal ring will not rotate, said resilient means coacting with the shaft and and contoured surface of said seal ring to bias the seal ring face into sealing engagement with the sealing surface on said cutter.
Claim 3
Dependent Claim
22 words
A roller cutter earth boring bit according to claim 1 wherein the said seal ring contoured surface comprises an inner conical surface.
Claim 4
Dependent Claim
38 words
A roller cutter earth boring bit according to claim 2 wherein the shaft has an oppositely tapered conical surface confronting the inner conical surface of the seal ring and said resilient means is located between said conical surfaces.
Claim 5
Dependent Claim
61 words
A roller cutter earth boring bit according to claim 1 wherein the seal ring is biased into engagement with the cutter sealing surface so that there is greater contact pressure between the outer margin of the seal ring face and the cutter sealing surface than there is between the inner margin of the seal ring face and the cutter sealing surface.
Claim 6
Dependent Claim
138 words
A roller cutter earth boring bit comprising: a bearing shaft arranged on said bit, a roller cutter mounted on said shaft, a sealing surface on said cutter, said shaft having an outer tapered surface, a seal ring having an inner tapered surface and a sealing face and being in encircling relationship to the shaft tapered surface, resilient means coacting with the tapered surfaces to bias the seal ring into engagement with the cutter sealing surface so that there is greater contact pressure between the outer margin of the seal ring face and the cutter sealing surface than there is between the inner margin of the seal ring face and the cutter sealing surface, said resilient means being in frictional contact with said seal ring and shaft to insure that said resilient ring and seal ring will not rotate.
Claim 7
Dependent Claim
138 words
A roller cutter earth boring bit comprising: a bearing shaft arranged on said bit, a roller cutter mounted on said shaft, a sealing surface on said cutter, said shaft having an outer tapered surface, a seal ring having an inner tapered surface and a sealing face and being in encircling relationship to the shaft tapered surface, resilient means coacting with the tapered surfaces to bias the seal ring into engagement with the cutter sealing surface so that there is greater contact pressure between the outer margin of the seal ring face and the cutter sealing surface than there is between the inner margin of the seal ring face and the cutter sealing surface, said resilient means being in frictional contact with said seal ring and shaft to insure that said resilient ring and seal ring will not rotate.
Claim 8
Dependent Claim
114 words
An earth boring bit cutter assembly comprising: a cutter support, journal means on said support, a roller cutter on said journal means, a sEaling surface on said cutter, a seal ring encircling said journal means, said seal ring having an inner conical surface and a sealing face, resilient means between the journal means and the seal ring, said resilient means being in frictional contact with said seal ring and journal means to insure that said resilient ring and seal ring will not rotate, said resilient means coacting with said journal means and conical surface of said seal ring to bias said seal ring face into sealing engagement with the sealing surface on said cutter.
Claim 9
Dependent Claim
114 words
An earth boring bit cutter assembly comprising: a cutter support, journal means on said support, a roller cutter on said journal means, a sEaling surface on said cutter, a seal ring encircling said journal means, said seal ring having an inner conical surface and a sealing face, resilient means between the journal means and the seal ring, said resilient means being in frictional contact with said seal ring and journal means to insure that said resilient ring and seal ring will not rotate, said resilient means coacting with said journal means and conical surface of said seal ring to bias said seal ring face into sealing engagement with the sealing surface on said cutter.
Claim 10
Dependent Claim
134 words
An earth boring bit cutter assembly comprising: a cutter support, journal means on said support, a roller cutter on said journal means, a sealing surface on said cutter, the journal means having an outer tapered surface, a seal ring having an inner tapered surface and a sealing face and being in encircling relationship to the tapered surface on said journal means, and means adapted to coact with the tapered surfaces to bias the seal ring into engagement with the cutter sealing surface so that there is greater contact pressure between the outer margin of the seal ring face and the cutter sealing surface than there is between the inner margin of the seal ring face and the cutter sealing surface and said seal ring tends to pivot about an end of its sealing face.
Claim 11
Dependent Claim
134 words
An earth boring bit cutter assembly comprising: a cutter support, journal means on said support, a roller cutter on said journal means, a sealing surface on said cutter, the journal means having an outer tapered surface, a seal ring having an inner tapered surface and a sealing face and being in encircling relationship to the tapered surface on said journal means, and means adapted to coact with the tapered surfaces to bias the seal ring into engagement with the cutter sealing surface so that there is greater contact pressure between the outer margin of the seal ring face and the cutter sealing surface than there is between the inner margin of the seal ring face and the cutter sealing surface and said seal ring tends to pivot about an end of its sealing face.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |