Belt tightener
AssigneeDaimlerChrysler AG
InventorsWilfried Bullinger, Walter Eberle, Christian Mayer, Markus Woldrich, Kai Wustlich
Life of this patent
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Abstract
A belt tightener of a seat belt in a vehicle, in particular a motor vehicle, is provided with a retracting spring in order to return the belt. A counterspring, which can be adjusted by a motor, is connected in parallel with the retracting spring in order to be able to reduce the tensile force of the belt for comfort considerations. The motor can also be connected in drive terms to the belt via a coupling arrangement to give reversible belt tightening.
Claims36
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.
Dependencies are inferred from the claim text.