Description: Portfolio van Martin Escher
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Necessity truly is the mother of invention. When working with a coffee machine you actually need three arms. I freed one by using one's foot to open the bin! It tilts backwards by itself or forewards once in that stance. The locks act as a retractable axis.
In this case a wooden can. Under a desk. Holding stuf down isen't hard. Allowing it to move is.
What to do: Sketch the situation. One has to think of one thing in two situation, working together.. Lalala difficult!.. So make it easy and draw both situatons in one sketch (first i did cyan). You use the "Equal Constraint" to make both situations look alike (cyan and blue), then connect both to a point that is going to represent the axis. The final dimensions are still free. You now have math at your disposal.