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US Patent: 41,867
Improvement in Joiners' Gage
Christian Sholl - Mount Joy, PA

USPTO Classifications:
33/44, D10/64

Tool Categories:
layout tools : marking gauges



Charles R. Frailey
Jacob Stauffer

Patent Dates:
Granted: Mar. 08, 1864

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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One of the classic patent gages. The premise here is quite simple, but really ingenious-- use a single screw to hold 3 or 4 arms by shaping the arms such that a single pressure point can lock them all. This worked quite well, making these popular tools in their day.

This gage was produced for about 20 years, in both 3- and 4-arm configurations. The shape of the arm on the 3-arm gage was slightly different than that shown in the patent drawing (it was hexagonal, rather than triangular).

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