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US Patent: 60,690
Improvement in Combined Square and Level
G. L. Chamberlain - Marietta, OH

USPTO Classifications:
33/343, 33/469

Tool Categories:
layout tools : levels
layout tools : bevels
layout tools : squares


S. Batchelder & Co. - Pittsburgh, PA

C. Ascoth
Wm. Dean Overell
A. W. McCormick
Will. S. Bowman

Patent Dates:
Granted: Jan. 01, 1867

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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This is a combination tool that adds a pivoting arm to a standard level, allowing it to be used as a square or bevel. The arm locks from a clever screw-activated mechanism on the side of the level.

Known examples of the production pieces do not use the patented locking mechanism, instead using a more traditional thumbscrew on the arm. They do, however, use the cute and clever heart-shaped cutouts on the arm, where the point of the heart is the indicia.

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