Patent US2472705A successfully refreshed from Google Patents.
Patent US3224146A successfully refreshed from Google Patents.
US3224146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for grinding drills
Assignee: Individual
•
Filing: 1963-05-22
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Granted: 1965-12-21
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Expires: 1983-05-22
Abstract
No abstract record available.
Inventors
- 👤 Ahlstrom Allan Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:33
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/26; B24B3/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A GRINDING APPARATUS FOR GRINDING A TWIST DRILL HAVING AT ONE END THEREOF FACES HAVING CUTTING EDGES, THE DRILL BEING PROVIDED WITH CHIP CHANNELS: A HOLLOW MAIN SHAFT HAVING LATERAL ARMS; A CENTERING AND CLAMPING MEANS FOR CLAMPING THE DRILL TO BE GROUND IN SAID MAIN SHAFT COAXIAL THEREWITH; TWO INCLINED GRINDING DISKS ROTATABLY CARRIED ON THE ARMS OF THE SHAFT, THE PERIPHERIES OF SAID GRINDING DISKS CLOSE TO EACH OTHER NEAR THE AXIS OF SAID CENTERING AND CLAMPING MEANS; AT LEAST ONE GUIDING MEANS ADAPTED TO ENGAGE ONE OF THE CHIP CHANNELS OF THE DRILL TO BE GROUND FOR LOCATING THE DRILL CORRECTLY RELATIVE TO SAID SHAFT AND THUS ALSO RELATIVE TO SAID GRINDING DISKS, THE LATTER THEREBY BEING BROUGHT TO CONTACT THE FACES OF THE DRILL; A HANDLE AT THE LOWER END OF SAID SHAFT SO THAT THE APPARATUS CAN BE HELD WITH ONE HAND OF THE OPERATOR DURING THE GRINDING OPERATION; AND MEANS FOR, UPON THE
Claim 2
Dependent Claim
160 words
IN A GRINDING APPARATUS FOR GRINDING A TWIST DRILL HAVING AT ONE END THEREOF FACES HAVING CUTTING EDGES, THE DRILL BEING PROVIDED WITH CHIP CHANNELS: A HOLLOW MAIN SHAFT HAVING LATERAL ARMS; A CENTERING AND CLAMPING MEANS FOR CLAMPING THE DRILL TO BE GROUND IN SAID MAIN SHAFT COAXIAL THEREWITH; TWO INCLINED GRINDING DISKS ROTATABLY CARRIED ON THE ARMS OF THE SHAFT, THE PERIPHERIES OF SAID GRINDING DISKS CLOSE TO EACH OTHER NEAR THE AXIS OF SAID CENTERING AND CLAMPING MEANS; AT LEAST ONE GUIDING MEANS ADAPTED TO ENGAGE ONE OF THE CHIP CHANNELS OF THE DRILL TO BE GROUND FOR LOCATING THE DRILL CORRECTLY RELATIVE TO SAID SHAFT AND THUS ALSO RELATIVE TO SAID GRINDING DISKS, THE LATTER THEREBY BEING BROUGHT TO CONTACT THE FACES OF THE DRILL; A HANDLE AT THE LOWER END OF SAID SHAFT SO THAT THE APPARATUS CAN BE HELD WITH ONE HAND OF THE OPERATOR DURING THE GRINDING OPERATION; AND MEANS FOR, UPON THE
References Cited (Backward Citations)
US2017532A
Cited
US2177644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |