Patent US4515228A successfully refreshed from Google Patents.
US4515228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air groove scraper
Assignee: Hughes Tool Co
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Filing: 1983-11-28
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Granted: 1985-05-07
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Expires: 2003-11-28
Abstract
Abstract An earth boring rock bit having a sealed bearing with air or gas as the circulating medium. An annular groove is formed in the vicinity of the seal and connected to the interior of the bit for cooling the seal and cleaning debris from the area of the seal. An air groove scraper is mounted on the shaft in the exit port of the annular groove to prevent the annular groove from becoming plugged by debris mixing with moisture in the hole.
Inventors
- 👤 George E. Dolezal
- 👤 Joseph L. Kelly, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:44
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/06; E21B10/00; E21B10/08; E21B10/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper in the annular groove to prevent the annular groove from becoming plugged.
Claim 2
Dependent Claim
102 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper in the annular groove to prevent the annular groove from becoming plugged.
Claim 3
Dependent Claim
107 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft, adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper mounted on the shaft and in the annular groove to prevent the annular groove from becoming plugged.
Claim 4
Dependent Claim
107 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft, adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper mounted on the shaft and in the annular groove to prevent the annular groove from becoming plugged.
Claim 5
Dependent Claim
112 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft, adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper mounted on the shaft and in the air exit port of the annular groove to prevent the annular groove from becoming plugged.
Claim 6
Dependent Claim
112 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft, adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper mounted on the shaft and in the air exit port of the annular groove to prevent the annular groove from becoming plugged.
Claim 7
Dependent Claim
125 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft, adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper mounted on the shaft and in the air exit port of the annular groove to prevent the annular groove from becoming plugged; wherein the scraper has sides which deflect gas out of the exit port.
Claim 8
Dependent Claim
125 words
An improved earth boring bit having a body with a hollow interior, a leg with a depending shaft to support a bearing, a rotatable cutter on the bearing, an annular seal between the cutter and the shaft, an annular groove formed in a radial surface at the end of the cutter and shaft, adjacent to, and exterior of, the annular seal, with an air exit port, and a gas passage extending from an opening in the annular groove to the interior of the bit, wherein the improvement comprises: a scraper mounted on the shaft and in the air exit port of the annular groove to prevent the annular groove from becoming plugged; wherein the scraper has sides which deflect gas out of the exit port.
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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) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |