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US Patent: 21,179
Method of Securing the Cutters to the Spindles of Augers
Bit with Detachable Cutter
Patentee:
Charles L. Barnes - New York, NY

USPTO Classifications:
408/213

Tool Categories:
woodworking tools : hand drills : drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Francis S. Low
Sidney Low

Patent Dates:
Granted: Aug. 17, 1858

Patent Pictures:
USPTO pdf tiff
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Description:
Lock-nut type arrangement to prevent detachable tip from loosening while backing bit out of hole.

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