All thrust reversers basically work the same way. They move a blocker into the airstream (on high-bypass engines, only the bypass air gets reversed).
The A320 uses four blocker doors that pivot into the airflow. They're hydraulically actuated - the actuators can be seen easily enough if you're in the correct seat.
Cascade reversers use a sliding sleeve (the duct itself). The sleeve moves aft, which simultaneously exposes the exhaust area (looks like a grate) and extends internal blockers. The blockers on the V2500 look particularly flimsy, but obviously work fine.
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.