The invention relates to a device comprising a lever associated with a stand carrying a rocker connected to the stand by a pivot connection about a first axis, the lever being connected to the rocker by a pivot connection about a second axis, a first transmission shaft with a first connection mechanism connecting the lever to the first transmission shaft, and a second transmission shaft with a second connection mechanism connecting the control lever to the second shaft. The first shaft and the first connection mechanism being connected by a pivot connection about a fifth axis that is inclined relative to the first axis and to the third axis, and the second shaft and the second connection mechanism are connected by a pivot connection about a sixth axis that is inclined relative to the second axis and to the fourth axis.