US Patent 10881946 Board sport learning kneeboard

A truck with two rigid bodies and an elastomeric component wherein a front truck and a rear truck may be connected with a frame to comprise a riding device with a longitudinal roll axis coincident with a virtual line between a front virtual pivot point and a rear virtual pivot point. Each virtual pivot point is located at the intersection of a line projecting upward from the central point of a hanger axle axis and a hanger pivot axis. Virtual pivot points are the points about which the front and rear hanger pivot axis rotate as a result of rider input leaning to the right or left.