A fruit processing tool

At the market I found this tool without knowing precisely what it was - I just thought it has something to do with pressing something. Afterwards at the internet I searched for the name Robix BS-12 and found a nice hungarian site with data and price for this particularly tool but unfortunately there was no informations about how to use it - http://www.robix.hu/en/fruitpressers.htm. Do you know this tool and how to use it? Please make a comment with your knowledge!