US Patent 10486052 Driving mode changeable mobility device

A mobility device is provided and includes a base panel that supports a passenger. A plurality of wheels are disposed at a plurality of points of the base panel and are coupled to the base panel to be rotated with respect to a vertical axis. A rotary portion provides a rotational force to rotate the wheel with respect to the base panel. Additionally, a braking portion is disposed on the rotary portion to adjust the plurality of wheels to be rotated with respect to the base panel or positions of the plurality of wheels to be fixed.