Patent ID: 9050941
Filing Date: 2015-06-09
Classification: B60R

Abstract:
1. A tensioning device ( 10 ) for a seat belt, comprising a gas generator ( 17 ), and a piston ( 21 ) which is guided in a tube ( 16 ) and closes a pressure chamber ( 20 ) in the tube ( 16 ), wherein the pressure chamber ( 20 ) is charged with pressure by the gas generator ( 17 ) upon an activation of the gas generator, and wherein the piston ( 21 ) by the pressure present in the pressure chamber ( 20 ) upon the activation of the gas generator is carried out a tensioning movement through the tube which is transmitted to the seat belt via a force transmitting device, the piston ( 21 ) having an opening ( 1 , 1 a ), which is surrounded by such a material that the opening is widened or opened by a material erosion effected by gas flowing from the pressure chamber ( 20 ) into the opening during gas discharge by the gas generator the opening being a recess on a radially outer peripheral surface ( 26 ) of the piston ( 21 ) and extending in the longitudinal direction of the piston.