Safety seat belt for a motor vehicle

Claim 1

Safety seat belt for motor vehicles with seats which are adjustable in the direction of the length of the vehicle, comprising a guiding anchorage (5) for the belt (6), secured to the vehicle and adjustable vertically against the action of spring loading (12) for automatic adjustment of its height above the floor (3) of the vehicle in accordance with the current position of the associated vehicle seat (1) by means of a flexible tension member (13) secured on the seat, through a ratio-changing device, characterised in that the tension member (13) comprises two separate tension member portions (13', 13") and the ratio-changing device is formed by a roller (14) mounted to rotate about a spindle (15) secured to the vehicle, with two portions (14', 14") of smaller and larger diameters for taking up and unwinding the portions (13' and 13") of the tension member attached to the anchorage (5) and to the vehicle seat (1).