Patent US3682260A successfully refreshed from Google Patents.
US3682260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary percussive drill and method
Assignee: Individual
•
Filing: 1970-05-28
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Granted: 1972-08-08
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Expires: 1990-05-28
Abstract
Abstract A rotary percussive drill has relatively movable inner and outer concentric drill pipes and a down-the-hole hammer that acts on the inner pipe near the cutting bits. The impact of the hammer is transmitted by an external shoulder on the inner drill to an internal shoulder on the inner drill to an internal shoulder on the outer drill adjacent the bits.
Inventors
- 👤 Gunter Klemm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:08
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/002; E21B10/00; E21B10/64; E21B4/00; E21B4/06; E21B7/20; E21B7/208
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A drilling apparatus comprising an outer drill pipe having an outer drill, an inner drill pipe having an inner drill bit and a down-the-hole hammer to transmit percussive shocks to said inner drill bit, and a percussion member disposed between said hammer and said inner drill bit, said percussion member having portions thereof striking said outer drill bit thereby to transmit percussive shocks also to said outer drill bit, said hammer having an external diameter which is smaller than the least internal diameter of said outer pipe and outer drill bit, thus enabling said inner drill bit to be replaced with another inner drill bit of an outside diameter smaller than the inside diameter of said outer drill pipe and bit to penetrate hard formations with said first drill pipe and said another inner drill bit while maintaining said outer drill pipe and bit stationary.
Claim 2
Dependent Claim
145 words
A drilling apparatus comprising an outer drill pipe having an outer drill, an inner drill pipe having an inner drill bit and a down-the-hole hammer to transmit percussive shocks to said inner drill bit, and a percussion member disposed between said hammer and said inner drill bit, said percussion member having portions thereof striking said outer drill bit thereby to transmit percussive shocks also to said outer drill bit, said hammer having an external diameter which is smaller than the least internal diameter of said outer pipe and outer drill bit, thus enabling said inner drill bit to be replaced with another inner drill bit of an outside diameter smaller than the inside diameter of said outer drill pipe and bit to penetrate hard formations with said first drill pipe and said another inner drill bit while maintaining said outer drill pipe and bit stationary.
Claim 3
Dependent Claim
39 words
Apparatus as claimed in claim 1, said portions of said percussion member comprising downwardly facing radially outwardly extending shoulder means on said percussion member overlying and contacting upwardly facing radially inwardly extending shoulder means on said outer drill bit.
Claim 4
Dependent Claim
30 words
Apparatus as claimed in claim 1, and a screw-threaded connection between said inner drill bit and said percussion member whereby said inner drill bit and percussion member are detachably interconnected.
Claim 5
Dependent Claim
41 words
Apparatus as claimed in claim 1, said inner drill bit having a plurality of ports therethrough for the passage of fluid for flushing cuttings from the drill face, said percussion member having an axial bore therethrough that communicates with said ports.
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |