I could be totally wrong, but it looks sort of like a hitch to attach an accessory to a tractor. I bet the part with the sort of coil looking ting in the center allows it to pivot... Not really sure though...
Looks like a chain link fence installer to me. The clamp on the left tightens to allow the steel straps to be installed, then it can be removed and used elsewhere.
The part on the left reminded me of something that attached on my tractor for some reason. LOL. Not sure quite why. I tried to do a google image search to figure out what it was but I didn't find any similar objects.