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US Patent: 161,390
Improvement in wood-screws
Patentee:
Allan Cummings (exact or similar names) - New York, NY

USPTO Classifications:
411/407, 411/919

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. L. Munson
William S. Sampson

Patent Dates:
Applied: Feb. 15, 1875
Granted: Mar. 30, 1875

Patent Pictures:
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Description:
This patent anticipates the Robertson screw (patent {}) but 30 years. However, inventor Cummings did not describe a method to form the recess in the screw heads: "The cavity may be formed in the screw-machine at the time the screw is made, by any of the well-known mechanical processes, this being no part of my invention, and requires no description here." Given how much effort Robertson, Thompson and Phillips made in describing how to manufacture their later screw-recess designs, Cummings' "requires no description" is over-optimistic.

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