US Patent: 290,812


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US Patent: 290,812

Auger-Bit

Patentee:

James Swan (exact or similar names) - Seymour, CT

USPTO Classifications:

408/213

Tool Categories:

woodworking tools : hand drills : drill bits : auger bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

George W. Gregory

W. H. Sigston

Patent Dates:
Applied:	Oct. 04, 1883
Granted:	Dec. 25, 1883

Patent Pictures:

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Description:

Thickness of spurs reduced due to their inner faces being concave. Swan revisits this auger bit in patent no. 320097, in which he slopes the outer faces of the spurs outward, slightly, toward the tip.