Patent US3293740A successfully refreshed from Google Patents.
US3293740A
Expired / Lapsed
US
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Method of producing a hole saw mandrel
Assignee: Black and Decker Corp
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Filing: 1964-06-16
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Granted: 1966-12-27
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Expires: 1984-06-16
Abstract
No abstract record available.
Inventors
- 👤 Sherwood G Enders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:55
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0473; F; F16; F16B; F16B2200/00; F16B2200/40; F16B2200/406; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49908; Y10T29/49915; Y10T29/49945; Y10T403/00; Y10T403/49; Y10T403/4966; Y10T403/70; Y10T403/7041; Y10T403/7098; Y10T408/00; Y10T408/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
THE METHOD OF PRODUCING A HOLE SAW MANDREL, WHICH COMPRISES THE STEPS OF: (A) PROVIDING A MANDREL SHANK FROM ORDINARY BAR STOCK HAVING A POLYGONAL CROSS-SECTION; (B) FORMING AN AXIAL BORE IN THE SHANK, WHEREBY A PILOT DRILL MAY BE INSERTED IN THE COMPLETED MANDREL; (C) FORMING A CYLINDRICAL PORTION OF REDUCED DIAMETER ON THE SHANK; (D) FORMING A MANDREL BODY WITH A BORE AND A COUNTERBORE THEREIN, WHEREBY AN INTERNAL ANNULAR SHOULDER IS FORMED BETWEEN THE BORE AND COUNTERBORE, AND WHEREBY THE DIAMETER OF THE COUNTERBORE IS LESS THAN THE GREATER WIDTH OF THE SHANK MEASURED ACROSS ITS LONGITUDINAL EDGES; (E) PLACING BRAZE RING ON THE SHANK BETWEEN THE ROUND DIAMETER AND THE RETAINING PORTION OF THE POLYGONAL SHANK; (F) PRESS-FITTING THE SHANK INTO THE MANDREL BODY, WHEREBY THE CYLINDRICAL PORTION OF THE SHANK IS RECEIVED IN THE BORE OF THE MANDREL BODY, THE BRAZE RING IS DISPOSED AGAINST THE INTERNAL ANNULAR SHOULDER ON THE BODY, AND THE LONGITUDINAL EDGES OF THE SHANK SCORE THE WALL OF THE COUNTERBORE IN THE MANDREL BODY AND FORM RESPECTIVE LONGITUDINAL RIDGES THEREIN;
Claim 2
Independent Claim
180 words
THE METHOD OF PRODUCING A HOLE SAW MANDREL, WHICH COMPRISES THE STEPS OF: (A) PROVIDING A MANDREL SHANK FROM ORDINARY BAR STOCK HAVING A POLYGONAL CROSS-SECTION; (B) FORMING AN AXIAL BORE IN THE SHANK, WHEREBY A PILOT DRILL MAY BE INSERTED IN THE COMPLETED MANDREL; (C) FORMING A CYLINDRICAL PORTION OF REDUCED DIAMETER ON THE SHANK; (D) FORMING A MANDREL BODY WITH A BORE AND A COUNTERBORE THEREIN, WHEREBY AN INTERNAL ANNULAR SHOULDER IS FORMED BETWEEN THE BORE AND COUNTERBORE, AND WHEREBY THE DIAMETER OF THE COUNTERBORE IS LESS THAN THE GREATER WIDTH OF THE SHANK MEASURED ACROSS ITS LONGITUDINAL EDGES; (E) PLACING BRAZE RING ON THE SHANK BETWEEN THE ROUND DIAMETER AND THE RETAINING PORTION OF THE POLYGONAL SHANK; (F) PRESS-FITTING THE SHANK INTO THE MANDREL BODY, WHEREBY THE CYLINDRICAL PORTION OF THE SHANK IS RECEIVED IN THE BORE OF THE MANDREL BODY, THE BRAZE RING IS DISPOSED AGAINST THE INTERNAL ANNULAR SHOULDER ON THE BODY, AND THE LONGITUDINAL EDGES OF THE SHANK SCORE THE WALL OF THE COUNTERBORE IN THE MANDREL BODY AND FORM RESPECTIVE LONGITUDINAL RIDGES THEREIN;
References Cited (Backward Citations)
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US2721592A
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US3146813A
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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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |