Here's an Australian Deere brochure which has more pics than the US site. see page 6. It doesn't reset on the go like an auto-reset plow, you need to stop and raise the plow to let the bottom reset. Maybe someone who's used one can comment further.

 http://www.deere.com/en_AU/brochure/ag/tillage/DSAA41424_Ploughs.pdf