Control system for an articulated tailboard or sideboard

The control system for a pull down door (1) articulated about a horizontal spindle (2) installed between two uprights (3) comprises sliding sections (11) able to slide along the uprights and fixings (4,5,12) for immobilizing the sliding sections relative to the uprights. The sliding sections and fixings allow height adjustment of the door's horizontal spindle. A control actuator (20) comprises a part (22) which is translated in a direction parallel to the uprights and controls the door's pivoting by means of a transmission rod (30).