Energy absorbing torsion bar seat belt retractor with sharp onse

Details Energy absorbing torsion bar seat belt retractor with sharp onse Energy absorbing torsion bar seat belt retractor with sharp onse

1997-11-05

2000-12-12

Cuomo, Peter M.

Chairs and seats

Body or occupant restraint or confinement

Safety belt or harness; e.g., lap belt or shoulder harness

297472, 297476, 297478, 280806, 2423791, A62B 3504, B60R 2228

Patent

active

061588164

ABSTRACT:
An energy absorbing seat belt retractor (20) comprising: a frame (22); a torsion bar (70,70') having a first and a second side, rotationally supported relative to the frame. The torsion bar of the type which is pre-torqued to create a permanent deformation therein or having an annular cross section to reduce a transition zone between the torsion bar's elastic and plastic deformation regions. The retractor also includes a locking device (200) adapted to be activated during a vehicle accident and operative on the first side (76) of the torsion bar to stop the torsion bar from rotating. A spool is operatively connected to the second side of the torsion bar, the spool having a seat belt positioned thereon, wherein with the locking device activated to prevent the first side of the torsion bar from rotating and with a predetermined load communicated to the seat belt, the spool and the torsion bar rotate in a direction of belt protraction opposed by a reaction force generated by the pre-torqued torsion bar as it twists.

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