US Patent: 248,854 - Auger Bit with Cross-Channel Lead Screw


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US Patent: 248,854

Auger
Auger Bit with Cross-Channel Lead Screw

Patentee:

Porter A. Gladwin (exact or similar names) - Boston, MA

USPTO Classifications:

408/214, 408/223, 408/230

Tool Categories:

woodworking tools : hand drills : drill bits : auger bits

woodworking tools : hand drills : gimlets

Assignees:

None

Manufacturer:

Unknown

Witnesses:

Henry W. Williams

George V. Mallon

Patent Dates:
Applied:	Jun. 03, 1881
Granted:	Nov. 01, 1881

Patent Pictures:

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Description:

The focus of this patent is on the continuation of the pod, (groove or channel) of the main spiral down across the lead screw. The channel is to be hollowed-out so as to create cutting edges, with the aim of aiding the lead screw threads to clear themselves . Intended to be used on augers, auger bits and gimlets which have lead screws. A known example is marked "Gladwin's Pat Nov.1.81" with no other indication as to the manufacturer (thanks to Dan Miller for this information).

For a very similar idea, see Brigg's patent number 270200.