Welcome to the router forums.
I believe what you have is a set of corner clamps.
I think you need a square frame for the bottom clamp (picture 1) to push the 2 sides into the corner. Clamp 1 mounted to the jig and pushed into the corner, then locked down by the thumb screw. Clamp 2 is for the top and goes into the corner and the 2 arms go over the sides and draw them into alignment. The sprins apply pressure to the workpieces.
Just a guess!
Work safe, Have Fun, Cut some wood,
I don't think the corner has to be square, could be round joint. could be barrel clamps, boat clamps
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Last edited by MEBCWD; 04-04-2012 at 11:01 PM.