Seat belt webbing energy management device

Details Seat belt webbing energy management device Seat belt webbing energy management device

B - Operations, Transporting

60

R

B60R 22/16 (2006.01) B60R 22/28 (2006.01)

Patent

CA 2141779

A vehicle safety apparatus (11) includes a length of belt webbing (34) for restraining a vehicle occupant. The belt webbing includes a plurality of folded portions (130, 132, 134) overlying each other and unstitched to each other. The safety apparatus (11) includes means (10) for controlling unfolding of the unstitched folded portions of belt webbing. The length of belt webbing (34) has end portions (136, 138) extending from opposite ends of the means for controlling unfolding. The means (10) for controlling unfolding includes means (32) for applying force to the unstitched folded portions of belt webbing for resisting unfolding. The unstitched folded portions (130, 132, 134) are movable relative to each other against the force applied to the unstitched folded portions in response to the application of a tensile force greater than a predetermined force to the belt webbing end portions (136, 138). The length of belt webbing (34) unfolds over a controlled period of time, reducing the abruptness of the load on the vehicle occupant during a vehicle collision.

Cette invention concerne un dispositif de sécurité (11) pour véhicule automobile qui comprend une ceinture (34) destinée à retenir l'occupant en cas de collision. La ceinture est repliée sur elle-même à plusieurs reprises pour former une série de couches (130, 132, 134) superposées mais non cousues les unes aux autres. Le dispositif de sécurité (11) comprend un moyen (10) assurant le dépliage contrôlé de la ceinture (34) dont les parties non repliées (136, 138) se prolongent de part et d'autre du moyen (10) susmentionné. Celui-ci comprend un mécanisme (32) servant à appliquer aux couches superposées non cousues de la ceinture une force s,opposant à leur dépliage. Ces couches (130, 132, 134) peuvent par contre se déplacer linéairement l'une par rapport à l'autre sous l'effet d'une force de traction sur les parties non repliées (136, 138) supérieure à une valeur prédéterminée. La ceinture (34) se déplie progressivement sur une période contrôlée, ce qui a pour effet d'atténuer la brutalité de la force de retenue de l'occupant à l'occasion d'une collision.

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