SEAT BELT RETRACTOR WITH TORSION BAR AND ROTATION LIMIT

摘要

A seat belt retractor (20) comprising: a frame (22); a hollow spool (30) for carrying a length of a seat belt (32), the spool rotationally supported upon the frame (22); a torsion bar (70), which when stressed can twist or rotate, having a first end (74) secured to a first end (48) of the spool (30) and a second end (76); a locking mechanism (200, 202, 210, 220, 222) for preventing the second end of the torsion bar (70) from rotating during an emergency; and a stopping mechanism (90, 110) located interior to the spool (30) for limiting the twisting of the torsion bar to a predetermined number of revolutions.