4.3. Retractor definition (Sweden) CRS-41-05e
Tommy PETERSSON from VTI shows us a drawing & explains the principle of a simple retractor. A wrap spring allows retracting the safety belt with a certain force and the retractor can be blocked via a “handle” in order to avoid rotation of the retractor during the crash.

Dorel thinks that the definition of the spring is crucial since a high retracting force can be obtained at the beginning and after few rolls this force can decrease significantly. A constant force spring must be used.

The finality of this subject is to decrease the difference between all test laboratories.