US Patent: 407,868 - Boring-Bit


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US Patent: 407,868

Boring-Bit

Patentee:

Joseph C. Middleton (exact or similar names) - Norristown, PA

USPTO Classifications:

408/215

Tool Categories:

woodworking tools : hand drills : drill bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Harold Corson

E. B. Helffenstein

Patent Dates:
Applied:	May 29, 1888
Granted:	Jul. 30, 1889

Patent Pictures: [ 1 | 2 ]

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Description:

Concave semi-circular bit, which allows for the cutting edge to extend nearly to the tip. Similar idea to a gimlet bit patented by Benjamin Bee (172377), but differing by having a smooth lead and threaded body.