Patent US3833070A successfully refreshed from Google Patents.
US3833070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient drill string guide and seal
Assignee: Gardner Denver Inc
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Filing: 1973-03-23
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Granted: 1974-09-03
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Expires: 1993-03-23
Abstract
Abstract A guide or centralizer characterized by a plurality of radially inwardly projecting wire bristles formed in a ring brush assembly for engagement with the elongated drill string sections of a rock drilling apparatus. The resilient character of the brushlike guide prevents scoring or galling of the drill string section outer surface under heavy lateral forces tending to deflect the drill string. The brushlike guide also serves as a dust and rock chip seal for a joint breakout mechanism.
Inventors
- 👤 F Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:08
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B19/167
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
In a rock drill apparatus: an elongated support; a drill motor mounted on said support for reversible movement therealong; a drill string connected to said drill motor and comprising one or more elongated tubular drill rods joined end to end; and, means mounted with respect to said support to be in surrounding engagement with said drill string, said means comprising a plurality of wirelike bristles projecting substantially radially inward with respect to the longitudinal axis of said drill string in such a way that the inward ends of said bristles are in relative sliding engagement with the outer surface of said drill rods for guiding said drill string to substantially prevent lateral deflection of said drill string.
Claim 2
Dependent Claim
117 words
In a rock drill apparatus: an elongated support; a drill motor mounted on said support for reversible movement therealong; a drill string connected to said drill motor and comprising one or more elongated tubular drill rods joined end to end; and, means mounted with respect to said support to be in surrounding engagement with said drill string, said means comprising a plurality of wirelike bristles projecting substantially radially inward with respect to the longitudinal axis of said drill string in such a way that the inward ends of said bristles are in relative sliding engagement with the outer surface of said drill rods for guiding said drill string to substantially prevent lateral deflection of said drill string.
Claim 3
Dependent Claim
29 words
The invention set forth in claim 1 wherein: said means comprises a substantially circular brushlike device including a supporting member for supporting the radial outward extremeties of said bristles.
Claim 4
Dependent Claim
27 words
The invention set forth in claim 1 wherein: said bristles are made of steel wire of a diameter in the range of 0.015 inches to 0.060 inches.
Claim 5
Dependent Claim
69 words
The invention set forth in claim 2 wherein: said rock drill apparatus includes a joint breakout mechanism mounted on said elongated support, said breakout mechanism including a housing having a bore through which said drill string projects and said breakout mechanism includes at least one of said brushlike devices mounted on said housing for guiding said drill string and for substantially deflecting drill cuttings from entry into said bore.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |