US Patent 7882909 Personal vehicle

A personal vehicle comprises a frame with a seat, two large, non-drive wheels connected by an axle at one end of the frame, an elongated swing arm attached to the axle, a pair of caster wheels connected to the frame opposite the large, non-drive wheels and a main drive wheel mounted to a fork and connected to the swing arm. The main drive wheel is located central the vehicle frame, intermediate the frame sides and intermediate frame front and rear sections.