Seat belt retractor having a torsion bar

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 22/34 (2006.01) B60R 22/28 (2006.01)

Patent

CA 2338241

A seat belt retractor (20) includes a frame (22) to rotationally support a torsion bar (50) and spool (30). The torsion bar is characterized by an elastic deformation zone and a sharp onset into a plastic deformation zone. The spool is operatively connected to rotate with the torsion bar. The retractor also includes a locking device (80), activated during a vehicle crash and operatively linked to the torsion bar for preventing one side of the torsion bar from rotating while permitting the other side and the spool to rotate once loaded by the vehicle occupant.

L'invention concerne un rétracteur (20) de ceinture de sécurité comprenant un cadre (22) destiné au support rotatif d'une barre (50) de torsion et d'une bobine (30). La barre de torsion est caractérisée par une zone de déformation élastique, qui se transforme soudainement en une zone de déformation plastique. La bobine est reliée fonctionnellement à la barre de torsion de manière à tourner avec elle. Le rétracteur comprend également un dispositif (80) de verrouillage, qui s'active en cas d'accident du véhicule et qui est relié fonctionnellement à la barre de torsion, de façon qu'il empêche la rotation d'un des côtés de la barre de torsion tout en permettant la rotation de l'autre côté de la barre de torsion et de la bobine, une fois sollicitées par l'occupant du véhicule.

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