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US Patent: 1,430,874
Machine for Making Door Butt Mortises
Nelson F. Anderson - Los Angeles, CA

USPTO Classifications:
144/27, 33/628

Tool Categories:
woodworking machines : joint making machines : mortising machines
layout tools : marking gauges : butt gauges


Not known to have been produced

James R. Townsend
A. W. Van Loon

Patent Dates:
Applied: Apr. 12, 1920
Granted: Oct. 03, 1922

Patent Pictures:
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This is an incredibly complicated machine designed to automate the cutting of hinge mortises for doors. In use, the machine is clamped to the edge of the door and the four handles are hit with a hammer. The first three mark the edges, the last actually cuts the mortise.

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