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US Patent: 679,927
Method of Making Screws
Patentee:
William A. Warman - Rochester, NY

USPTO Classifications:
411/940, 470/10, 470/198

Tool Categories:

Assignees:
William A. Warman - Rochester, NY
Max H. Fischer - New York, NY

Manufacturer:
Unknown

Witnesses:
Fredk. F. Church
G. Willard Rich
Walter B. Payne

Patent Dates:
Applied: Apr. 04, 1900
Granted: Aug. 06, 1901

Patent Pictures: [ 1 | 2 ]
William A. Warman patent Aug. 6, 1901
USPTO pdf tiff
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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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