Anyone know what this is?

Handle winds, but also extends out. Small, sharp piece of metal will raise and lower when handle extends outwards. Very hard to describe -- any thoughts?

 

Looks like an industrial can/container opener of some sort.

 

https://www.antiquers.com/threads/clamp-vise-of-some-kind.40046 the other part of this?

 

Are there any markings on it? It does look as though it maybe a can opener of sorts? I can see a gear like mechanism which looks like it would/could turn a can when cranked, I think there must be a base that a can would sit as it turns? Just guesses.

 

no idea the size?

 

Can opener. Needs a table edge mount.