Old cast iron farm device used to move hay in a barn. At least one of the track rollers is rusted and will not move.
It may free up with a little oil and wrench work. The device does have a little oilfilm on parts of it. If its a bother take it to the car wash and let it dry.
Also note the the uppe rtrack rollers the front two are closer together than the back pair and V shaped. Unless you plan on transporting hay why tamper with a neat rustic piece (my opinion). The item "Wonderful Old Porter Barn Hay Trolley" is in sale since Sunday, October 11, 2015. This item is in the category "Collectibles\Tools, Hardware & Locks\Tools\Pulleys, Block & Tackle". The seller is "jimdan45" and is located in Maryville, Missouri.
This item can be shipped to United States.