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US Patent: 315,530
Manufacture of Drills
Patentee:
Samuel Moore (exact or similar names) - Providence, Providence County, RI

USPTO Classifications:
72/338, 72/371, 72/378, 76/108.1

Tool Categories:
tool making : making drills and augers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jan. 23, 1885
Granted: Apr. 14, 1885

Patent Pictures:
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Report data errors or omissions to steward Joel Havens
Description:
Claim:

In my invention, the cylindrical blank is rolled first between flat rolls to face it on two sides and bring it to uniform thickness. The fattened blank is then passed between rolls with slightly convex faces to start the groove therein and then rolls with more decided convex faces are used to complete the groove.

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