Thanks Gareth. The reason I am interested in how the leaning lock works, is that I would like to lean, and my balance is good. But due to disability, I can't hold a leaning bike up at a stop. The box isn't really what I am after, though I like it - it could be used to carry arm crutches or a walker.
People keep recommending recumbent trikes but they don't lean either; you just compensate by keeping the center of gravity low. And they're hard for me to get up from. So machines like this Carve attract my attention.