US Patent: 461,897 - Single-Twist Auger Bit


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US Patent: 461,897

Auger Bit
Single-Twist Auger Bit

Patentee:

Ellsworth Ford (exact or similar names) - New Haven, CT

USPTO Classifications:

408/212, 408/214

Tool Categories:

woodworking tools : hand drills : drill bits : auger bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

W. H. Chapman

James Bishop

Patent Dates:
Applied:	Sep. 03, 1890
Granted:	Oct. 27, 1891

Patent Pictures:

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Description:

Cross-section of the "blade" of the single twist and the ellipsoid profile between twists designed to maximize space and speed of clearing chips. For a very similar bit patented the previous year, see Hoefle's patent (430344).

Another key element of this patent regards a small gap, or annular groove, at the base of the lead screw. The purpose is to allow the threading of the lead screw to be formed without risk of damaging the floor, or cutting, lip(s).