What is it? Set 430

I hope you're not disappointed to hear the clamp is for making boats, although maybe you're correct and the patent is a ruse.

I had previously posted the first item

Thanks, looks like it would have been a fun go-cart.

"Rob H." fired this volley in news: snipped-for-privacy@news1.newsguy.com:

I can guarantee the patent was falsely prosecuted. That clamp _cannot_ work. Even "back then" a good model would convince the patent clerks, even when they didn't understand the principles. Nowadays, you don't have to prove _anything_ except that you were first to file for the idea (It used to be "first to conceive it", but no longer).

(Just work out the moments acting on the elements)

LLoyd

"Lloyd E. Sponenburgh" wrote ..

As the saying goes you can not have to many clamps. I think the drawings is not showing the clamps that hold the board to the rib of the boat. Once the boards are held from rotating, the clamp will work.

Item 2491 is known as an "upset swage". It is a die that is used to shape the teeth of a saw to make them wider.

There is picture of someone using a swage in this link:

Thanks, I think you are correct, and just changed my answer. The patent that I listed was definitely lacking in good information on how it was use, this patent was an improved version of an earlier one which can be seen at the link below. You're right about the saw type, the earlier patent states that the inventor experimented mainly on large crosscut saws, but also proposed to use it on carpenter's handsaws and crosscut saws generally.