US Patent: 104,457 - Improvement in Auger


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US Patent: 104,457

Improvement in Auger

Patentee:

Richard H. Hopkins (exact or similar names) - Hinsdale, NH

USPTO Classifications:

408/213

Tool Categories:

woodworking tools : hand drills : drill bits : auger bits

Assignees:

None

Manufacturer:

Unknown

Witnesses:

Henry O. Coolidge

George S. Wilder

Patent Dates:
Granted:	Jun. 21, 1870

Patent Pictures:

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Description:

Intended for use in tapping maple trees, the diameter of the bit enlarges progressively from the tip, so that the walls of the holes are refreshed upon subsequent, deeper, borings.