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US Patent: 48,327
Improvements in Joints of Folding Rules
Justus A. Traut - New Britain, CT

USPTO Classifications:

Tool Categories:
rules : folding rules : folding rule joints

The Stanley Rule & Level Co. - New Britain, CT

The Stanley Rule & Level Co. - New Britain, CT

R. S. Porter
Alfred Andrewz

Patent Dates:
Granted: Jun. 20, 1865

Patent Pictures:
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A small spring is used to make the main joint rigid and remain straight when opening. This is supposed to prevent the main joint from becoming loose due to use and eliminate the need to peen the main pin to re-tighten the main joint.

Advertised by SR&L as the "Patented Spring Joint" available in the 1867 and 1870 catalogs with some of the Stearns boxwood rules.

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