Apparatus for pretensioning seat belt webbing

Details Apparatus for pretensioning seat belt webbing Apparatus for pretensioning seat belt webbing

1997-12-24

1999-01-26

Darling, John P.

Winding, tensioning, or guiding

Reeling device

With spring motor

B60R 2246

Patent

active

058630090

ABSTRACT:
An apparatus (40) pretensions seat belt webbing (16) which is extensible about an occupant of a vehicle seat (14). The apparatus (40) includes a housing (50) defining a chamber (56), a piston (90) in the chamber (56), and a coupling member (42) for coupling the piston (90) to the seat belt webbing (16). The coupling member (42) transmits force acting on the piston (90) to the seat belt webbing (16). The apparatus (40) further includes a first pyrotechnic device (200) for applying a first force to the piston (90) to move the piston initially in a first direction (B) in the chamber (56) to remove slack in the seat belt webbing (16). A second pyrotechnic device (220) applies a second force to the piston (90) in the first direction (B) to tension the seat belt webbing (16) against the occupant after the slack has been removed from the seat belt webbing (16) by the first force.

REFERENCES:
patent: 3937487 (1976-02-01), Pech
patent: 4152025 (1979-05-01), Bendler, et al.
patent: 5407148 (1995-04-01), Ono et al.
patent: 5671949 (1997-09-01), Bauer, et al.

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