Device for tightening a seatbelt

Details Device for tightening a seatbelt Device for tightening a seatbelt

1999-07-08

2000-11-21

Walsh, Donald P.

Winding, tensioning, or guiding

Reeling device

With spring motor

60632, F01B 2908

Patent

active

061490954

ABSTRACT:
A device for tightening a vehicle seatbelt has a piston-like drive member arranged in a guide tube. A propellant gas drives the drive member by expanding in a pressure chamber adjoining the drive member. A movement transmitting system connects the drive member and the seatbelt to be tightened. The drive member is a step piston which is provided with a first pressure chamber and a second pressure chamber. A propellant gas discharge system supplies the propellant gas to the pressure chambers. The propellant gas flows into the first pressure chamber and the step piston is set into motion by the propellant gas. The propellant gas acting in the first pressure chamber clears a discharge orifice in the second pressure chamber after covering a first distance so the propellant gas flowing into the second pressure chamber and acting therein additionally drives the step piston.

REFERENCES:
patent: 4385775 (1983-05-01), Shimogawa
patent: 4917210 (1990-04-01), Danicek et al.
patent: 5211447 (1993-05-01), Sedlmayr et al.
patent: 5495790 (1996-03-01), Greiner
patent: 5519997 (1996-05-01), Specht
patent: 5641131 (1997-06-01), Schmid et al.
patent: 5676397 (1997-10-01), Bauer
patent: 5842344 (1998-12-01), Schmid
patent: 5913486 (1999-06-01), Pywell et al.
patent: 6042041 (2000-03-01), Foster et al.

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