Vehicle cab with variable driver's seat

The structure has a cab (1) mounted on a chassis and having a drivers seat (3) and an additional seat (4) mounted on sliding rails by a base. A steering wheel (5) is connected to a steering column (6) mounted on a parallelogram and is fixed on the cab. The parallelogram is formed by two arms and connected to a steering system by the base. A spring pull rod controls rotation of lower ends of the arms around axes.