DISPOSITIVO DI REGOLAZIONE DELLA POSIZIONE DEL VETRO DI UN ALZACRISTALLO DI UN AUTOVEICOLO

A device for adjusting the position of a window pane associated with a window lifter of a motor vehicle, comprises a slider (10) slidable with respect to a window lifter guide, which comprises a base plate (14) and a movable jaw (16) opposed to the plate (14). A gap (18) for receiving a lower edge of said window pane (P) is defined between the plate (14) and the jaw (16), and adjustable clamping means are associated with the plate (14) and the jaw (16), which comprise a screw member (26) crossing the plate (14) and the gap (18), and which engages a main nut screw (30) on the side of the jaw (16), and a rotatable member (34) associated with the main nut screw (30) to change the distance between the latter and the jaw (16). The main nut screw (30) is formed on a bracket element (32) interposed between the gap (18) and the jaw (16), and the rotatable member (34) is associated with a threaded element (38) engaging a corresponding hole (40) of the bracket member (32), which is formed in a position radially spaced from said main nut screw (30).