What mechanical action distinguishes Roberts' ratchet from Campagnolo's skewer?
Answer
The skewer secures a removable assembly, while the ratchet deals with rapid tightening/loosening of a fixed connection
The functional divergence is that Campagnolo's device secures a component meant to be removed (the wheel), whereas Roberts' invention addressed the speed of fastening a permanent connection point using ratcheting action.

Related Questions
Who is credited with patenting the quick release mechanism specifically for bicycle wheels?What was Campagnolo's primary motivation for inventing the quick release skewer?What type of mechanism did Peter M. Roberts invent that was also termed 'quick release'?How does the Campagnolo quick release skewer secure the wheel?What mechanical action distinguishes Roberts' ratchet from Campagnolo's skewer?What can occur if the tension on a quick release skewer is too low?What is considered the true measure of the quick release skewer's effectiveness, rather than the lever's final position?What is the general trend in high-performance cycling regarding traditional quick release skewers?What are the two main advantages offered by thru-axles over traditional skewers?When was Peter M. Roberts' quick-release ratchet mechanism patented in the United States?What characteristic of a thru-axle allows it to provide superior rotational resistance?