Patent ID: 8794672

Claim:
Method of establishing belt pull-out with a specified travel-time-function in a vehicle occupant restraint system during an accident exposing a vehicle to an acceleration field, in which the vehicle occupant restraint system comprises a seat belt, a spring-mass system with a reference body of mass m t which is exposed to the acceleration field and which can be moved against a spring force by an acceleration of the acceleration field, and a blocking and releasing device for blocking and releasing the belt pull-out of the seat belt, wherein a travel-time-function of the reference body when moving against the spring force mechanically establishes a travel-time-function of the belt pull-out via the blocking and releasing device of the vehicle occupant restraint system, characterized in that, when establishing the belt pull-out with the specified travel-time-function, the travel-time-function of the reference body is scaled down by downscaling the travel-time-function of the reference body of mass m t in the spring-mass system with a spring providing the spring force when the spring-mass system is exposed to the acceleration field with the acceleration which moves the reference body against the spring force yielding the travel-time-function, wherein the downscaling is done by coupling the reference body of mass m t to additional masses m r which are kinematically linked together in such a way that the additional masses m r do not react to the acceleration field.