Patent ID: 11628800

Abstract:
The invention relates, inter alia, to a tensioner drive (11) for a seatbelt installation, having a tube (30), at least one piston (25) which within the tube (30) is displaceable along a propulsion direction (P2), and a gas generator (40) for generating a propulsion gas (G) and a propulsion pressure on a pressure-facing side of the piston (25). According to the invention it is provided that the piston (25) on the pressure-facing side thereof has a first sealing element (90) which, upon triggering the gas generator (40), is impinged with the propulsion pressure and seals a first tubular portion (31) of the tube (30) that is filled with propulsion gas (G) in relation to a second tubular portion (32) of the tube (30) that in the propulsion direction (P2) lies behind said first tubular portion (31); a second sealing element (100) which, upon triggering the gas generator (40), is separated from the first sealing element (90) is disposed in the propulsion direction (P2) behind the first sealing element (90); wherein the second sealing element (100) is displaceable relative to the first sealing element (90), and in the event of leakage of the first sealing element (90) and when impinged with pressure by the propulsion gas (G) is displaced along the propulsion direction (P2) while enlarging the spacing (A) between the first sealing element (90) and the second sealing element (100).