I'm probably missing something vital, but isn't it fairly simple to make one from a good quality picture frame, probably an aluminium one for strength? Lose the multiple small clips and replace them with a couple of longer leaf-springs made from brass-strip (carried by any d.i.y. shop). The spring pivot point can be a small nut-and-bolt, or a pop-rivet, with the depth of the head lost within a piece of mounting board. The hinge for the backing board can be a couple of layers of cloth held on with pva glue or similar, as it isn't stress bearing when the frame is closed . . . I feel a little project coming on . . .
Edit: This idea would work with standard pre-built picture frames at a smallish size, but I can imagine that anything bigger than 11x14" might need a more substantial frame to be made by the local frame-shop and perhaps heavier glass. The principle should be the same though?
Last edited by MartinP; 01-28-2014 at 06:49 PM. Click to view previous post history.