Patent ID: 6851716
Filing Date: 2005-02-08
Classification: B60R

Abstract:
1. A belt tightener of a seat belt for an occupant on a seat in a vehicle, in particular a motor vehicle, comprising: a retracting device, which is actuated by a retracting spring, for automatically shortening the belt, an extension lock of the belt, the extension lock being effective at a predetermined deceleration or acceleration of the vehicle or of its bodywork, when a predetermined extension speed of the belt is exceeded or both at the predetermined deceleration or acceleration and when the predetermined extension speed is exceeded, an irreversible tensioning device which, on obtaining an accident signal, which can be produced by a sensory mechanism, briefly brings about an irreversible tightening of the belt with great force, a counterspring having a belt-remote abutment which can be adjusted by a motor arranged parallel to the retracting spring, and a normally open coupling arranged between the motor and the retracting device, wherein the motor can be reversed between two power ranges, and wherein the coupling closes automatically if the motor switches to high power and operates in its running direction provided to give reversible belt tightening.