Belt tensioner for safety belts for motor vehicles

US5553803A · kind A · utility

Assignee

• Takata Vehicle Safety Technology GmbH · DE

Inventors

• Jurgen Mitzkus · Mutlangen, DE
• Martin Wifling · Blaustein, DE
• Robert Kopetzky · Lonsee, DE
• Georg Bannert · Hirschhorn, DE
• Andreas Wengert · Mutlangen, DE
• Ulrich Diepold · Ulm, DE
• Thomas Kempfle · Bibertal, DE
• Erik Emmert · Ulm, DE
• Hermann Steffan · Graz, AT

Key dates

• Filing date: Feb 1, 1995
• Grant date: Sep 10, 1996
• Expiry date: Feb 1, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R2022/468
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A belt tensioner for safety belt arrangements in motor vehicles has a holder (11) on which are provided a belt winding reel (12) with a safety belt (13) coiled thereon, a blocking arrangement and an additional drive (15) connected via clutch (20) to the belt winding reel (12). The additional drive (15) contains a pressure source (16) which abruptly builds up a high pressure in a pressure chamber on being triggered and also contains a torque generating device (18) acted on by the pressure in the pressure chamber (17) and a drive shaft (19) connected to the latter. The drive shaft (19) is rotationally fixedly connectable to the belt winding reel (12) via the clutch (20). The torque generating device (18) includes a flexible draw band (21) which is secured at one end at a first mounting point (25) to the periphery of the drive shaft (19) or to the drive reel (22) concentrically mounted thereon and is partially wound onto the drive shaft (19), or onto the drive reel (22) and is secured at the other end, at a second mounting point (26) to the peripheral wall (30) of a band running chamber (23) within a housing (24). Pressure applied to the draw band causes belt tensioning movement of th…