Building ping-pong table and confused nearly how to trademark it make higher to 90 degree next to joint.? Hi all, I arranged to try my hand at making...

Hi all,
I arranged to try my hand at making a ping-pong table out of two pieces of 4' x 8' solid wood (I forgot what the type be but definitely thicker than plywood and does not bow within on itself). The hardware dept cut two pieces at 4' L by 5' W and two pieces at 1' L by 2.5' W for the middle. I connected the two long pieces to the short/thin middle pieces by joints that allow you to fold the table surrounded by on itself for more room. It is sitting on top of our dining table, so space is predetermined. Before I paint it, I was curious as to how one get a table like this to lift up at a 90 degree angle so that you can hit against a backboard for practice. Other than placing a stocky object trailing the raised piece, I am at a loss. Any help would be appreciated. Here is a rough schematic:

______________________5 W______________________
4 L
(joint x2)
________2.5 W_________ ________2.5 W___________
1 L
(joint x2)
______________________5 W______________________
4 L

Thanks!
What follower or aircondioner should i capture?
Answers:    http://www.ping-pong.com/manuals/HT8291....
I would conjecture you'd have to use some sort of blind hinge close to kitchen cabinets use---only bigger beside some sort of locking bar. Or I don`t know a piano hinge would do it and not interfere with play.