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US Patent: 1,117,597
Mortise-Marking Tool
Patentee:
John H. Ostberg - Bridgeport, CT

USPTO Classifications:
33/44, D10/64

Tool Categories:
layout tools : marking gauges : butt gauges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. M. Newman
Alex. L. De Laney
Ivan L. Morehouse
Ruth M. Worden

Patent Dates:
Applied: May 18, 1914
Granted: Nov. 17, 1914

Patent Pictures:
USPTO pdf tiff
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Description:
This is a metal butt gage very similar to the Bodmer 1911 patent (985,504), but with some extra marking points and adjustable reference surface for marking lock mortises as well as hinge mortises. It is also the first design I have found that allows you to mark two parallel lines referencing an inside corner, such as would be encountered in laying out the strike plate in a rabbeted jamb.

This looks top be a very well-designed and useful tool, but is not known to have been produced.

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