US Patent: 679,927
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| Method of Making Screws
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Patentee:
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| William A. Warman (exact or similar names) - Rochester, NY |
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Patent Dates:
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| Applied: |
Apr. 04, 1900 |
| Granted: |
Aug. 06, 1901 |
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Patent Pictures:
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William A. Warman patent Aug. 6, 1901 |
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Stan Schulz
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Description: |
| The patent describes a method of forming hollow set screws by drawing sheet metal. Dies would shape the exterior of the screws; the interior would be formed by "irregular polygonal mandrel" matching the shape of the wrench would be used.
Hammacher, Schlemmer & Co. advertised as "sole agent" for these screws in 1905. In that ad and the patent drawing, the mandrel / wrench is hexagonal.
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