Robin Corell in Atascadero CA
I think what you are looking for is a link lock. They are a type of latch with a cam action with handle/wings that fold down, some even have an intigrated key lock.

I don't have the catalog handy where I have ordered them before but here is a link to a pic I found with a quick google search. let me know if you need more info and I will try and dig up info on the ones I used before.

Robin