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US Patent: 1,142,138
Combined Lock and Butt Gage
Patentee:
Mathew F. Biersdorf - Los Angeles, CA

USPTO Classifications:
33/44

Tool Categories:
layout tools : marking gauges : butt gauges

Assignees:
None

Manufacturer:
Unknown

Witnesses:
J. F. Goodenow
Herman Deutsch

Patent Dates:
Applied: Nov. 16, 1914
Granted: Jun. 08, 1915

Patent Pictures:
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Description:
This is the first of two patents issued to Mathew Biersdorf for a butt gage suitable for marking both hinge and lock mortises. His 1918 patent (1,282,670) was a simplification of this design, and was produced commercially, but the production tools were marked with this patent date as well.

The main new feature of this tool is the split marking arm, which allows the tool to mark either one line (for hinges) or two lines (for the lock mortise), each accounting for the gain needed for door layout.

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