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US Patent: 78,769
Improvement in the Manufacture of Augers and Bits
Machine for Upsetting Cook's Bits
Patentee:
James Swan - Seymour, CT

USPTO Classifications:
72/449, 76/2

Tool Categories:
tool making : making drills and augers
woodworking tools : hand drills : drill bits : auger bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Charles Douglas
E. H. Knight

Patent Dates:
Granted: Jun. 09, 1868

Reissue Information:
Reissued as RE4,516 (Aug. 15, 1871)

Patent Pictures: [ 1 | 2 ]
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Description:
This machine is designed, specifically, to upset the gouge shape cutting lips of Cook's patent bits. A spring loaded shaft in conjunction with a cam on the drive shaft, engages and disengages the die with the bit. A pin on the bevel gear rotates the shaft and die a quarter-turn to twist the lips, then automatically disengages. Auger bits, made by the James Swan Co., were marked with this patent date.

Assigned to Richard P. Bruff in second re-issue, October 21, 1873.

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