Ohhh... I like your method and design for this! Now if you put a hinge between the two not only could they move forward and back (might be up and down once mounted) but also flap up and down (forward and back once mounted). Hopefully you get what I mean.
BTW Brass fastner or brass paper brads is what I've always called them.
http://en.wikipedia.org/wiki/Brass_fastener