Seat belt tightening device

Details Seat belt tightening device Seat belt tightening device

1997-04-17

1999-04-20

Jillions, John M.

Winding, tensioning, or guiding

Reeling device

With spring motor

B60R 2246

Patent

active

RE0361909

ABSTRACT:
An object of the present invention is to provide a seat belt tightening device including a driving unit having excellent properties which assures that an intensity of webbing tightening power and a quantity of webbing tightening activity can easily be increased, and moreover, acceptable webbing tightening properties can be obtained with the seal belt tightening device. A driving unit 4 for a pretensioner disposed on one side wall of a retractor base 18 includes a pair of gas generators 8 and 9 which are arranged on the base end side of a cylinder 5. At the time of vehicle collision, a piston 6 slidably received in the cylinder 5 is driven by the explosion pressure derived from explosion of an explosive filled in both the gas generators 8 and 9, whereby a webbing winding shaft is rotated in such a direction that the loosened state of a seat belt can be eliminated.

REFERENCES:
patent: 4447017 (1984-05-01), Inukai
patent: 4508287 (1985-04-01), Nilsson
patent: 5145209 (1992-09-01), Lenzen
patent: 5163708 (1992-11-01), Kotama
patent: 5344095 (1994-09-01), Frei

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