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US Patent: 198,857
Improvement in Augers
Patentee:
Henry L. Shaler - Deep River, CT

USPTO Classifications:
408/212

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. L. Selden
Gideon Parker

Patent Dates:
Applied: Nov. 21, 1877
Granted: Jan. 01, 1878

Patent Pictures:
USPTO pdf tiff
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Description:
The focus of this patent is on the shape of the spur. The inner face is made concave to minimize the wedging action, while the profile of the cutting edge is an elongated slope. The claim is that the overal configuration lessens resistance in the cut, acts as a better guide in the cut, and adds to the working life of the spur.

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