My "new" router plane
This is the router plane that got me interested in
patent searching. The thumbscrew is marked
Pat June 9, 1925 on one side and Economy on the other.
I believe that the thumbscew is patent
Thumb or wing screw. This patent has also been entered into
(Directory of American Tool and Machinery Patents).
My post about it in a woodworking forum is
. It was my first foray into the uspto's classification system and
was also the first time I fooled on the hunt. I had mistakenly assumed the patent was for
some feature of the tool, not for the thumbscrew itself! Tools and thumbscrews are understandably
classified differently so I did not find the patent in the classifications I was perusing. It
wasn't until I resorted to a brute force search (looking at nearly all 1,119 utility patents
issued on June 9, 1925 in the early dial-up day of the internet)
that I found the patent.