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US Patent: 956,116
Butt and Lock Mortise Gage
Fred Lohman - Los Angeles, CA

USPTO Classifications:
33/44, 33/667

Tool Categories:
layout tools : marking gauges : center marking gauges
layout tools : marking gauges : butt gauges


Not known to have been produced

E. E. Johansen
E. L. Chandler
R. F. Sherer
R. D. Tinklepaugh

Patent Dates:
Applied: Sep. 24, 1908
Granted: Apr. 26, 1910

Patent Pictures:
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A fascinating little butt gage with several interesting features.

The big new feature here is to use a center marking point for the lock mortise, to help in positioning the drill. It uses the same basic idea as the much earlier Kenny's patent (98,504 - 1/4/1870), with left- and right-handed threads on the main rod. Unlike the Kenny's gage, however, this one uses a very interesting rack and pinion adjustment method, with a separate locking screw.

This feature supposedly offered greater precision in the adjustment, but I don't know if that would overcome its inherent fragility. It is certainly a neat mechanism, though!

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