Mechanism (1) to support at least one device (7) installed outside a vehicle (2), the mechanism (1) comprising: —a support base (3) fixed on the vehicle (2), —a wing (6) pivotally attached to the support base (3), the at least one device (7) being fixed to the wing, —a driving module (4) movably attached to the support base (3), —the support base (3) comprising a cam (8) enabling a linear displacement of the driving module (4) along the cam (8), —an arm (5) having one extremity (9) connected to the driving module (4) and an other extremity (10) connected to the wing (6) so that the arm (5) drives the folding and/or unfolding of the wing (6) according to the displacement of the driving module (4) along the cam (8).