Patent ID: 8210460

Claim:
A seat belt tensioner for a seat belt system, comprising: a seat belt spindle; a gearwheel connected to the seat belt spindle; a blocking device comprising a latching pawl for locking the seat belt spindle in a tensioned position by engaging in teeth of the gearwheel; and a bearing pin, wherein the blocking device is configured such that the latching pawl can be brought into a first pawl position blocking the gearwheel in a seat belt-unrolling direction by engagement of the latching pawl with the teeth of the gearwheel such that rotation in the seat belt-unrolling direction is prevented until the gearwheel exerts an exertion force on the latching pawl that exceeds a first predetermined force and into a second pawl position blocking the gearwheel in a seat belt-tensioning direction of rotation by engagement of the latching pawl with the teeth of the gearwheel such that rotation in the seat belt-tensioning direction is prevented until the gearwheel exerts an exertion force on the latching pawl that exceeds a second predetermined force, wherein the blocking device is configured to have the latching pawl perform a first pivot-over operation from the first pawl position into the second pawl position when the gearwheel is driven in the seat belt-unrolling direction by a seatbelt extraction force that exceeds a predetermined maximum such that the gearwheel exerts the exertion force on the latching pawl that exceeds the first predetermined force and configured to have the latching pawl perform a second pivot-over operation from the second pawl position into the first pawl position when the gearwheel exerts the exertion force on the latching pawl that exceeds the second predetermined force, wherein the latching pawl is held rotatably on the bearing pin, and wherein the blocking device comprises an elongated hole and the latching pawl is guided on the bearing pin via the elongated hole.