The present invention relates to a device, comprising: - a main frame； - one or more than one wheel that is associated with the main frame； - supports； - wherein the supports are arranged in a support frame that is movably connected to the main frame； - wherein the support frame comprises a seat sub frame and a leg sub frame； - wherein one of the seat sub frame and the leg sub frame is fixedly hinged relative to the main frame, and wherein the other of the seat sub frame and the leg sub frame is displaceably hinged relative to the main frame； and - a transformation mechanism associated with the main frame and configured to convert the device between a planar support state and an angled support state, wherein supports enclose an angle to define a seat and backing support, and vice versa； - wherein the leg sub frame is extended to beyond its hinge relative to the main frame and comprises a set of wheels at the free end of the extended leg sub frame, wherein the extended leg sub frame is configured to provide a sturdy wheel base in the angled support state to define a wheel chair mode.
