The steering wheel has bearing portions that are coupled to a base structure. The planar bottom portion and bent side leg (4) are comprised in the base structure. An arc-shaped recess (11) is formed between the bearing portions and side leg, and orthogonal...

The system (11) has four pivot articulations (41-43, 45) defining four quadrilateral vertices (Q11) arranged in a plane (P11) perpendicular to an axis (X42). Extension and retraction units comprising rigid support arms (21-24) and a hydraulic cylinder (31)...