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US Patent: 3,899
Single-Twist Auger, Gimlet, &c.
Patentee:
William N. Clark - Chester, CT

USPTO Classifications:
408/204, 408/210, 417/526

Tool Categories:
woodworking tools : hand drills : drill bits : auger bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Ely Warner
Jonathan Warner

Patent Dates:
Granted: Jan. 31, 1845

Patent Pictures:
USPTO pdf tiff
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Description:
Patent claim has to do with the inner and upper surfaces of the twist being concave, rather than convex. The purpose is to allow the chips to rise up through the bit more freely, especially an advantage while boring deep holes.

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