Autoliv Development Ab

Stefan Höfs

Michael Pech

A pretensioner coupling for a seat belt retractor for a motor vehicle of a type having a belt shaft and a pretensioner drive for winding the belt shaft. The pretensioner coupling having a coupling latch movably arranged between a release position and an engagement position. The coupling latch produces a load-transmitting rotational connection between the belt shaft and the pretensioner drive when in the engagement position and movable out of the engagement position and into the release position to permit relative rotation between the belt shaft and the pretensioner drive. An inertial mass mounted on the belt shaft is rotationally arranged in relation to the belt shaft and the coupling latch being coupled with the inertial mass wherein the inertial mass rotates more slowly than the belt shaft upon winding of the belt shaft by the pretensioner drive thereby moving the coupling latch to the engagement position, and wherein the inertial mass rotating faster than the belt shaft at the conclusion of the winding of the belt shaft by the pretensioner drive, moving the coupling latch to the release position.

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Hamburg, Germany

Stefan Höfs