US Patent: 164,953 - Improvement in Expansible Bits


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US Patent: 164,953

Improvement in Expansible Bits

Patentee:

Fredreck Willig (exact or similar names) - Joliet, IL

USPTO Classifications:

408/180, 408/181

Tool Categories:

woodworking tools : hand drills : drill bits : adjustable drill bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Thomas H. Hutchins

Thomas P. Ford

Patent Dates:
Applied:	Apr. 17, 1875
Granted:	Jun. 29, 1875

Patent Pictures:

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Description:

Though superficially similar to Gibbs' patent 13261, the details of construction are quite different. The adjustable portion is stabilized by a dovetailed shoulder near the cutting edge, pivots on the pin half-way up the bit, and is adjusted by the upper screw.