A device that includes at least one slider joined to a window which slides along the rail defining the trajectory for the window. The trajectory is defined by a departure angle formed by the vertical and initial upper curvature of the rail which is ±45° and the curvature radius of the aforementioned trajectory which is about 0 to 500 mm. The device includes a means of adjusting the position of the device with regard to a door including an upper pivoting axle on the rail which allows the device to tilt to fit it in the door with two lower transversal screws for lateral adjustment, and one screw on the slider for adjusting the window with regard to the rail and the slider.