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US Patent: 97,177
Improvement in Carpenters' Grooving-Planes
Patentee:
Theodore Duval - Hartford, CT

USPTO Classifications:
30/486

Tool Categories:
woodworking tools : planes : dado planes

Assignees:
None

Manufacturer:
Hartford Plane Co. - Hartford, CT

Witnesses:
Unknown

Patent Dates:
Granted: Nov. 23, 1869

Patent Pictures: [ 1 | 2 ]
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Description:
Featured on the cover of Roger Smith's Patented & Transitional Planes in America, Volume I, the patented dado plane of Theodore Duval was one of the most complex transitional planes ever produced. All previous examples, as is the case with this specimen, have not been marked with the maker's name, but there is no mistaking this tool. Unlike the example shown in the Smith book, and the other examples of which we are aware, this example does not feature brass thumb screws for the adjustment of the width of the plane, but instead has recessed, slotted screws to accomplish that task. This example also features a distinctively shaped steel depth stop unlike the brass stop found on other examples of the Duval patent. While we can only speculate, it seems likely that this was an earlier, perhaps pre-production version of the Duval Patent and that evaluation in use led to the addition of a "quick adjust" feature to the body width adjustment that would not have required the use turning of 6 screws to adjust the plane.It goes without saying, but we will mention it anyway, that an inventor who could make such a fundamental mistake in design was perhaps not headed for a stellar career in manufacturing. (Courtesy and (C) Martin J. Donnely www.mjdtools.com)

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