US3076357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spade drill blade
Assignee: Erickson Tool Co
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Filing: 1961-08-21
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Granted: 1963-02-05
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Expires: 1981-08-21
Abstract
No abstract record available.
Inventors
- 👤 Milton L Benjamin
- 👤 Elmer L J Syrene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0002; B23B51/0003; B23B51/00035; B23B2251/00; B23B2251/48; B23B2270/00; B23B2270/08; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/899; Y10T408/909; Y10T408/9098; Y10T408/90993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A SPADE DRILL BLADE COMPRISING A BLOCK HAVING PARALLEL TOP AND BOTTOM PLANE FACES, A POINTED CUTTING END, AND PARALLEL SIDE FACES, SAID CUTTING END BEING FORMED WITH A PAIR OF CUTTING EDGES EFFECTIVE TO DRILL A HOLE IN A WORKPIECE WHEN SAID BLADE IS ROTATED AND FED AXIALLY AGAINST THE WORKPIECE, SAID SIDE FACES BEING FORMED TO GUIDE SAID BLADE IN THE DRILLED HOLE AND BEING FORMED WITH LEADING EDGES THAT ARE IN CIRCUMFERENTIALLY TRAILING RELATION WITH RESPECT TO THE RADIALLY OUTER CORNERS OF SAID CUTTING EDGES THUS TO ELIMINATE "HEELING" ACTION OF SAID BLADE IN USE, SAID CUTTING EDGES DEFINING AN OBTUSES POINT ANGLE AND EACH BEING OF ZIGZAG FORM FROM THE POINT TO SUCH OUTER RADIALLY OUTER CORNERS, SAID BLADE HAVING FIRST CUTTING EDGE PORTIONS DEFINING THE POINT ANGLE EXTENDING TO A WIDTH OF ABOUT 65% OF THAT OF THE BLADE, AND SECOND ADJOINING AND REVERSELY INCLINED CUTTING EDGE PORTIONS EXTENDING TO A WIDTH OF ABOUT 82% OF THAT OF THE BLADE.
Claim 2
Dependent Claim
165 words
A SPADE DRILL BLADE COMPRISING A BLOCK HAVING PARALLEL TOP AND BOTTOM PLANE FACES, A POINTED CUTTING END, AND PARALLEL SIDE FACES, SAID CUTTING END BEING FORMED WITH A PAIR OF CUTTING EDGES EFFECTIVE TO DRILL A HOLE IN A WORKPIECE WHEN SAID BLADE IS ROTATED AND FED AXIALLY AGAINST THE WORKPIECE, SAID SIDE FACES BEING FORMED TO GUIDE SAID BLADE IN THE DRILLED HOLE AND BEING FORMED WITH LEADING EDGES THAT ARE IN CIRCUMFERENTIALLY TRAILING RELATION WITH RESPECT TO THE RADIALLY OUTER CORNERS OF SAID CUTTING EDGES THUS TO ELIMINATE "HEELING" ACTION OF SAID BLADE IN USE, SAID CUTTING EDGES DEFINING AN OBTUSES POINT ANGLE AND EACH BEING OF ZIGZAG FORM FROM THE POINT TO SUCH OUTER RADIALLY OUTER CORNERS, SAID BLADE HAVING FIRST CUTTING EDGE PORTIONS DEFINING THE POINT ANGLE EXTENDING TO A WIDTH OF ABOUT 65% OF THAT OF THE BLADE, AND SECOND ADJOINING AND REVERSELY INCLINED CUTTING EDGE PORTIONS EXTENDING TO A WIDTH OF ABOUT 82% OF THAT OF THE BLADE.
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) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |