Anyone know what this Old Forge tool is for?

[barbb0]

It is 9 3/4" long.  I can't find anything under the patent number that is on it.  Wondering what it is for and what it is called?

Thanks,
Barb

[john k]

This is called a muffler chisel, in places I have worked.  The fin on the back is for slitting the outer pipe, when driven between the inner and outer pipes.  Regular  chisels get wedged in place.

[Aunt Phil]

Panel slitter.
Smart man starts from a hole in the center of the cut, drops the cutter in and cuts in both directions from the hole.

My preference is one driven by an air hammer.

[barbb0]

Thanks so much!
Barb

[rusty]

The patent shows a different tool, but probably is just the maker taking liberties, it is a hammered cutting tool, the cutting edge is just 90 out from your tool (listed as a bushing removal tool, for cutting inside sleeved bushings)

Patent is from 1939

PS: a comment on old tools describes the one shown in the patent, marked with the same name and patent number (but marked 172A), so there are 2 types with that patent, 172A, and 72B...hmmmm

[Barb]

Thanks Rusty!  I looked up that patent but did not think it could be the same one.  Good to know.