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Method for downsizing a safety device for a motor vehicle

  • US 8,794,672 B2
  • Filed: 04/04/2011
  • Issued: 08/05/2014
  • Est. Priority Date: 04/09/2010
  • Status: Active Grant
First Claim
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1. 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 mt 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 mt 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 mt to additional masses mr which are kinematically linked together in such a way that the additional masses mr do not react to the acceleration field.

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