Method of producing drills and similar tools,and tools,especially drills,made according to said method
Abstract
Abstract A METHOD OF PRODUCING TOOLS, ESPECIALLY DRILLS, WITH STRAIGHT OR TWISTED GROOVES OR FLUTES ACCORDING TO WHICH THE RAW TOOL IS PROVIDED WITH AT LEAST ONE LONGITUDINAL PASSAGE MEANS IN THAT SECTION OF THE TOOL WHICH IS TO BECOME THE CUTTING SECTION, SAID LONGITUDINAL PASSAGE MEANS BEING FILLED WITH FILLING MATERIAL HAVING A MELTING TEMPERATURE ABOVE THE DEFORMING TEMPERATURE BUT LESS THAN THE HARDENING TEMPERATURE OF THE RAW MATERIAL FROM WHICH THE TOOL IS MADE. THE CUTTING SECTION OF THE RAW TOOL IS SUBSEQUENTLY HEATED TO DEFORMING TEMPERATURE AND THE APPROXIMATE CROSS-SECTION OF THE FINISHED TOOL IS PRODUCED IN A CHIPLESS MANNER BY ROLLING OR EXTRUSION PRESSING. FINALLY, THE FILLING MATERIAL IS MELTED AND REMOVED FROM THE LONGITUDINAL PASSAGE MEANS WHEREUPON THE TOOL IS FINISH MACHINED. THE INVENTION ALSO COVERS A TOOL COMPOSED OF TWO SECTIONS WELDED TOGETHER AND PRODUCED THE ABOVE MANNER.
Inventors
- 👤 Richard Dorrenberg
Bibliographic Details
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |