US Patent: 29,793 - Single-Spur Double-Twist Auger Bit


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US Patent: 29,793

Auger
Single-Spur Double-Twist Auger Bit

Patentee:

William A. Ives (exact or similar names) - New Haven, 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:

James Benham

Ira Merwin

Patent Dates:
Granted:	Aug. 28, 1860

Patent Pictures:

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Description:

Patent claim regards the use of a single spur, on a double twist, double cutting lip, auger bit. The idea is to promote clean holes, as the single spur is ensured to describe just one circle, as well as to cut down on rotational resistance (as in centre bits).