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Tensioning device for a gas bag

  • US 6,173,989 B1
  • Filed: 09/14/1998
  • Issued: 01/16/2001
  • Est. Priority Date: 09/15/1997
  • Status: Expired due to Fees
First Claim
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1. A tensioning device for a head protection restraining system in vehicles, comprising:

  • an inflatable gas bag with two ends, said gas bag extending between an A-column and a C-column of the vehicle, one of said ends of said gas bag being fastened to said A-column and the other to said C-column;

    a cylindrical tube having one end which is pivotally attached to one of said columns;

    a piston slidably movable in said tube and being coupled to one of said ends of said gas bag, said piston being provided with a reverse stroke inhibiting means comprising at least one roller body arranged between an inclined surface of said piston and an inner surface of a wall of said tube; and

    a spring having a first end and a second end, said first end of said spring being coupled to said one end of said tube, said second end of said spring being coupled to said piston, said spring being tensioned both in a non-activated state and in an activated state of said gas bag when said gas bag is fully deployed.

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