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US Patent: 14,561
Method of Manufacturing Augers
George G. Griswold - Chester, CT

USPTO Classifications:
200/19.11, 76/102

Tool Categories:
tool making : making drills and augers
woodworking tools : hand drills : drill bits : auger bits


George G. Griswold & Co. - Chester, CT

Charles L. Griswold
Joshua L. Hommedieu

Patent Dates:
Granted: Apr. 01, 1856

Patent Pictures:
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This patent has to do with the thickness and shape of the auger blank. The upper third of the working portion is thicker than the lower two-thirds - the latter being convex on both faces. The middle to be about the same thickness as the upper portion, and thinning down toward the edges. Claimed to gain strength for the bit while providing additional clearance for the chips.

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