Abstract: Optionally, a plurality of spacers 228 is arranged between the planar surface 120 of the interfacing arrangement 114 (or the top horizontal arm) and the seat arrangement 102, for permanently raising the seat arrangement 102 with respect to the interfacing arrangement 114. The spacers 228 can be implemented as rectangular or cylindrical solid blocks that can be fabricated from plastics materials, metals, metal alloys, polymers, ceramics, wood, composites and so forth. The spacers 228 can be fixed between the seat arrangement 102 and the top planar surface 120 of the top horizontal arm of the interfacing arrangement 114 such that height of the seat arrangement 102 relative to the footrest arrangement 116 is raised. For example, a plurality of metallic spacers is fixed between the seat arrangement 102 and the interface arrangement by a technician such as by welding the metallic spacers between the seat arrangement 102 and the interface arrangement.

Abstract: There is disclosed a mobility aid device including a seat arrangement upon which a user sits when the mobility device aid is in operation, a main unit that supports the seat arrangement, and a wheel arrangement that supports the main unit on a floor surface. The mobility aid device is driven in operation from a motor arrangement included in at least one of the main unit and the wheel arrangement, wherein the mobility device aid is propelled forwards or backwards and turned by the motor arrangement. The wheel arrangement includes two wheels mounted at lateral sides of main unit, wherein the two wheels are mutually independently driven in operation by the motor arrangement. The mobility aid device is self-balancing using the two wheels by employing a control module that controls an electrical signal applied to the motor arrangement, and the wheels are contained within an area that is less than 120% of a seating area of the seat arrangement.