Patent US4031971A successfully refreshed from Google Patents.
US4031971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet nozzle drilling assembly
Assignee: C0NSOLIDATION COAL Co
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Filing: 1976-10-08
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Granted: 1977-06-28
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Expires: 1996-10-08
Abstract
Abstract A drilling assembly including a jet nozzle bit rotatable on a fluid supply shaft. The assembly includes a bearing housing protected by seals and vent ports to prevent fluid which has leaked between the fluid supply shaft and the jet nozzle bit from contaminating the bearings.
Inventors
- 👤 Thomas R. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B4/00; E21B4/02; E21B7/00; E21B7/18; F; F16; F16C; F16C19/00; F16C19/54; F16C19/545; F16C33/00; F16C33/72; F16C33/76; F16C2352/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
In a drilling assembly comprising (a) a fluid supply shaft; (b) a jet nozzle rotatably mounted on an end of said fluid supply shaft and having a plurality of outlet ports adapted to impart rotational force to said nozzle upon passage of fluid through said ports; (c) a housing affixed to said nozzle and extending rearwardly therefrom to encompass a portion of said fluid supply shaft; (d) a bearing section between said fluid supply shaft and said housing, said bearing section including thrust bearing means and radial bearing means; and (e) retaining means connected to said fluid supply shaft and adapted to retain said nozzle, housing and bearing means in position on said fluid supply shaft; the improvement comprising: vent means providing an unrestrained fluid passage from the rear of said nozzle to the exterior of said housing whereby pressurized fluid leaking between the fluid supply shaft and the nozzle may pass freely to the exterior of the housing, thereby avoiding fluid contamination of said bearing section.
Claim 2
Dependent Claim
167 words
In a drilling assembly comprising (a) a fluid supply shaft; (b) a jet nozzle rotatably mounted on an end of said fluid supply shaft and having a plurality of outlet ports adapted to impart rotational force to said nozzle upon passage of fluid through said ports; (c) a housing affixed to said nozzle and extending rearwardly therefrom to encompass a portion of said fluid supply shaft; (d) a bearing section between said fluid supply shaft and said housing, said bearing section including thrust bearing means and radial bearing means; and (e) retaining means connected to said fluid supply shaft and adapted to retain said nozzle, housing and bearing means in position on said fluid supply shaft; the improvement comprising: vent means providing an unrestrained fluid passage from the rear of said nozzle to the exterior of said housing whereby pressurized fluid leaking between the fluid supply shaft and the nozzle may pass freely to the exterior of the housing, thereby avoiding fluid contamination of said bearing section.
Claim 3
Dependent Claim
22 words
The drilling assembly of claim 1 wherein the improvement further comprises a seal positioned between said bearing section and said vent means.
Claim 4
Dependent Claim
26 words
The drilling assembly of claim 2 wherein the improvement further comprises a seal at the rear of said housing to prevent contamination of said bearing section.
Claim 5
Dependent Claim
40 words
The drilling assembly of claim 2 wherein the improvement further comprises an annular void chamber between said nozzle and said seal and wherein a plurality of vent ports extend through said housing in fluid communication with said annular void chamber.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |