The invention provides a device comprising a control lever associated with a body carrying a first plate connected to the body, a second plate connected to the first plate with the control lever being connected to the second plate, a first transmission shaft pivotally mounted relative to the body, a first connection mechanism connecting the control lever to the first transmission shaft in such a manner that pivoting of the control lever about the first axis causes the first shaft to pivot about the fourth axis, a second transmission shaft pivotally mounted relative to the body, a second connection mechanism connecting the control lever to the second transmission shaft in such a manner that pivoting of the control lever about the second axis causes the second shaft to pivot about the sixth axis, and a platform connected to the body, the second connection mechanism being pivotally mounted on the platform and being pivotally mounted on the control lever.