hold the pawl in connection with the driving input member or with the driven output member for so long as the force transmitted by the pawl remains below a predetermined value this system automatically interrupts the kinematic drive chain of the movable member in the case of a force exceeding a predetermined value this arrangement makes the device practically insensitive to friction and eliminates the uncertainty on the threshold of the triggering force application_number US 8783693 A description the window lifters represented in fig1 to 3 are known per se but have been represented in order to facilitate the understanding of the various embodiments of the invention represented in fig4 to 10 the window lifter 1 of fig1 comprises a motorized reduction gear 2 with a worm 12 engaged with a toothed wheel 10 secured to an output pinion 3 which meshes with a toothed sector 4 the latter is secured to an arm 5 articulated about a spindle 6 and whose end opposite sector 4 carries the window 7 the window lifter 8 illustrated in fig2 is of the type with a rack cable 9 sliding in a sheath 11 the cable 9 meshes with the output pinion 3.