US3589826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: GREENFIELD INDUSTRIES Inc A CORP OF DE
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Filing: 1969-08-25
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Granted: 1971-06-29
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Expires: 1989-08-25
Abstract
Abstract A drill bit having a shank provided with portions of different cross-sectional configuration to enable use of the bit in conventional chucks having either two, three or more jaws.
Inventors
- 👤 Willis S Fenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:11
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/005; B23B2231/00; B23B2231/02; B23B2231/0216; B23B2231/0228; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/907
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A drill bit for use in either two three-jaw three jaw chucks, having a shank portion of round cross section adjacent its outer end, and a generally square portion disposed inwardly along the shank from said round portion, the dimension across the flats of said square portion being less than the diameter of said round portion to define a shoulder facing toward the drill end of said bit, said dimension being such that adjacent flats do not meet in sharp corners but are separated by a narrow band of said round portion, said round portion being adapted to be gripped by the jaws of a conventional three-jaw chuck, said square portion being adapted to be gripped by a conventional two-jaw chuck with the jaws thereof engaging said flats and said shoulder to prevent accidental withdrawal of said bit.
Claim 2
Dependent Claim
138 words
A drill bit for use in either two three-jaw three jaw chucks, having a shank portion of round cross section adjacent its outer end, and a generally square portion disposed inwardly along the shank from said round portion, the dimension across the flats of said square portion being less than the diameter of said round portion to define a shoulder facing toward the drill end of said bit, said dimension being such that adjacent flats do not meet in sharp corners but are separated by a narrow band of said round portion, said round portion being adapted to be gripped by the jaws of a conventional three-jaw chuck, said square portion being adapted to be gripped by a conventional two-jaw chuck with the jaws thereof engaging said flats and said shoulder to prevent accidental withdrawal of said bit.
Claim 3
Dependent Claim
49 words
A drill bit according to claim 1 wherein said shank is provided with a second generally square portion at its outer end, said second square portion having substantially the same dimensions as the first-mentioned square portion and also adapted to be gripped by the jaws in a two-jaw chuck.
References Cited (Backward Citations)
US1209362A
Cited
US3136347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |