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US Patent: 60,342
Improvement in Tap Borers
Tap Borer & Reamer
Patentee:
Silas S. Crocker - Maquoketa, IA

USPTO Classifications:
408/208

Tool Categories:
woodworking tools : hand drills : drill bits : tapered reamers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Jefferson H. Bramon
Ambrose N. Johnson

Patent Dates:
Granted: Dec. 11, 1866

Patent Pictures:
USPTO pdf tiff
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Description:
The focus of this patent is on "... a volute-shaped tool formed of a single curved plate, whose salient edge is sharpened for the purpose of reaming out a conical hole ..." The tool can have a threaded portion at the tip for use in bung-hole and tap boring, but would serve no purpose when boring hubs to take boxes.

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