Abstract: The invention relates to a self-positioning device for safety belts of the passive type, capable of shifting a movable point of positioning of the same belt, to the purpose of fastening and of releasing the occupant of the seat, by means of the door's shutting and opening stroke, of the type comprising a rack rod of curved shape, rigidly fastened at one of its ends on to the car's body, and a pinion inmeshing with it, rotatably supported by the door and operatively linked to an amplifier mechanism in its turn operatively linked to the belt and capable of transforming the rotary movement of the pinion into an amplified movement of rectilinear type of the same positioning point along a guide diagonally positioned on the door, the rock rod being an anular sector and being partly toothed, so as to operate over a portion of the door's shutting and opening stroke only.

Abstract: An automatic positioning device for a passive safety belt able to move a mobile positioning point for the belt in order to retain and release the seat occupant by opening and closing the door, comprising a rack bar of arcuate shape rigidly fixed at one end to the vehicle body, and a pinion engaging therewith which is rotatably supported by the door and operationally connected to an amplifier mechanism which is itself operationally connected to the belt and is able to convert the rotary movement of the pinion into an amplified rectilinear movement of said positioning point along a rail disposed diagonally on the door.