US Patent: 762,099


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US Patent: 762,099

Auger-Bit

Patentee:

Norman Sperry (exact or similar names) - Seymour, CT

USPTO Classifications:

408/213

Tool Categories:

woodworking tools : hand drills : drill bits : auger bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Frederic C. Earle

Clara L. Weed

Patent Dates:
Applied:	Mar. 24, 1904
Granted:	Jun. 07, 1904

Patent Pictures:

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Description:

One of the threads of the lead screw terminates part way down to provide for quick entry at the tip and the conventional transition into the cutting spur provided by double threads.