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US Patent: 549,745
Two-Foot Rule
Patentees:
Daniel R. Porter - Chelsea, Suffolk County, MA
Reuben S. Whittier - Chelsea, Suffolk County, MA

USPTO Classifications:
33/497

Tool Categories:
rules : folding rules : folding rule joints

Assignees:
Melville P. Hayward - Suffolk County, MA

Manufacturer:
Not known to have been produced

Witnesses:
A. D. Harrison
Rollin Abell

Patent Dates:
Applied: Mar. 21, 1895
Granted: Nov. 12, 1895

Patent Pictures:
USPTO pdf tiff
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Description:
Wright, Brown, & Quinby - patent attorneys

This invention relates to improvements in the common two-foot four-fold carpenters’ or pocket rule; and it consists in graduating radially the flange of the middle joint with the degrees of a circle, means for locking the said joint in any desired position and rabbetting the inner corners of the ends of the rule to clear the locking mechanism when the rule is folded.

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