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US Patent: 57,282
Improvement in Wooden Screws
Patentee:
Thomas Bowers (exact or similar names) - Zanesville, OH

USPTO Classifications:
411/423, 74/424.75

Tool Categories:

Assignees:
None

Manufacturer:
Ohio Tool Co. - Columbus, OH

Witnesses:
John Quigley
Samuel Champman

Patent Dates:
Granted: Aug. 21, 1866

Patent Pictures: [ 1 | 2 | 3 | 4 ]
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Description:
Vise screw found with its head marked, Ohio Tool Co, Bowers Pat. Pat Aug 1866.

The innovation is a screw-thread profile of a buttress style that is claimed to have higher strength than previous profiles. This profile was particularly intended for bench-screws in wood, where the grain of the wood is weaker in shear force along the direction of the grain.

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