US3749511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized sealing means for a hydraulic turbodrill
Assignee: Individual
•
Filing: 1971-06-29
•
Granted: 1973-07-31
•
Expires: 1991-06-29
Abstract
Abstract A hydraulic motor of the turbodrill type including a housing, a rotor shaft rotatably mounted via bearings in said housing and connectible to a drill bit to transmit driving/torque thereto, sealing means between the rotor shaft and the housing arranged to oppose access of drilling mud to said bearing means, said sealing means comprising pressurized inner and outer sealing devices.
Inventors
- 👤 W Mayall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:18
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; Y; Y10; Y10S; Y10S415/00; Y10S415/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A hydraulic motor for driving a rock drill, including a housing connectible to a drill-string, a rotor shaft rotatably mounted via bearing means in said housing and connectible to a drill bit to transmit driving torque thereto, sealing means between the rotor shaft and the housing arranged to oppose access of drilling mud to said bearing means, and means effective in operation to apply the pressure of drilling mud, at a high pressure substantially that at which it is delivered to the motor via the drill-string, to pressurize lubricant present in said bearing means characterized by means effective in operation to convey drilling mud, at or near to said high pressure, through the said rotor shaft to the bottom end region of the said bearing means for application to the outside of the said sealing means at said bottom end region.
Claim 2
Dependent Claim
141 words
A hydraulic motor for driving a rock drill, including a housing connectible to a drill-string, a rotor shaft rotatably mounted via bearing means in said housing and connectible to a drill bit to transmit driving torque thereto, sealing means between the rotor shaft and the housing arranged to oppose access of drilling mud to said bearing means, and means effective in operation to apply the pressure of drilling mud, at a high pressure substantially that at which it is delivered to the motor via the drill-string, to pressurize lubricant present in said bearing means characterized by means effective in operation to convey drilling mud, at or near to said high pressure, through the said rotor shaft to the bottom end region of the said bearing means for application to the outside of the said sealing means at said bottom end region.
Claim 3
Dependent Claim
67 words
A hydraulic motor as claimed in claim 1, wherein the said sealing means comprises inner and outer sealing devices and the said mud conveying means is arranged to convey the said mud to a point in said sealing means between said inner and outer sealing devices, a path being provided for the lEakage of the said mud from the said sealing means out of the said housing.
Claim 4
Dependent Claim
22 words
A hydraulic motor as claimed in claim 2, wherein each of the said sealing devices comprises a plurality of interengaging sealing rings.
Claim 5
Dependent Claim
32 words
A hydraulic motor as claimed in claim 1, wherein the said mud conveying means is arranged to receive high pressure drilling mud directly from the drill-string without any substantial loss of pressure.
Claim 6
Dependent Claim
52 words
A hydraulic motor as claimed in claim 1, wherein the said mud conveying means comprises a conduit extending through the hollow rotor shaft, an end fitting on said conduit which end fitting is secured relative to the rotor shaft, and a passage leading along the rotor shaft to the said sealing means.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |