Thanks Kent. I particularly like the cardboard/stickpin approach. Those are things I have readily available and should have been an obvious choice to model 4 bar linkage with. I often let the fog of war/just want to get 'er done get in the way of proper planning.
When I let Frank's 4 bar linkage just sit I could see the apparently simple parallelogram but the crook in the back pair threw me. What's really intriguing though is the way that crook raises the leading edge of the drawer to clear the side, but makes it end up level and the crook ends up being the stop. I'm always drawn to simple genius.

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