Thrust reverser device

A thrust reverser device of a nacelle, comprising:

• a thrust reversal cowl movable in translation and moving alternately from a closed position in which the thrust reversal cowl provides an aerodynamic continuity of the nacelle and covers flow deflecting means, to an open position in which the thrust reversal cowl opens a path within the nacelle and uncovers the flow deflecting means,
• said flow deflecting means comprising at least one first deflecting cascade distributed over a circumference of the thrust reversal cowl and arranged so that a diverted flow passes, at least in part, through said at least one first deflecting cascade, when the thrust reverser device is in reverse jet;
• and
• a rear frame supporting a downstream end of said at least one first deflecting cascade,
• wherein the rear frame comprises at least an extension structure provided with second deflecting cascades which redirect a portion of the diverted flow when the thrust reverser device is in reverse jet, said extension structure extending said at least one first deflecting cascade.