Patent ID: 8775030

Claim:
A vehicle seat belt system comprising a reversible belt tensioner ( 12 ) adapted to apply a belt tightening force (F) on one or more predetermined levels to a belt strap ( 14 ) of a seat belt, a control unit ( 16 ) for controlling the belt tensioner ( 12 ) and a device ( 18 ) for detecting the course of a road (S 1 , S 2 ) ahead of the vehicle and for identifying bends lying ahead of the vehicle, wherein the control unit ( 16 ) causes the belt tightening force (F) to be increased from a first tightening force for a first bend to a second tightening force for a second bend, the second tightening force being greater than the first tightening force, when in the course of the road the second bend follows the first bend within a predetermined distance.