US Patent 7866429 Traveling apparatus

A coaxial two-wheeled vehicle includes a plurality of wheels disposed in parallel, a vehicle body, at least one of a step plate and a seat, an operating member, and a mechanism. The vehicle body supports plurality of wheels rotatably. The step plate is coupled to the vehicle body to carry a driver in an upright attitude. The seat is coupled to the vehicle body to seat the driver. The operating member is coupled to the vehicle body and operated by the driver for inputting driver's operation including an accelerating operation and a decelerating operation. The mechanism is configured to move at least one of the step plate and the seat in a front-rear direction of the vehicle body in accordance with an operation of the operating member.