Abstract: A seat belt retractor has a spool having seat belt webbing wound thereon mounted for rotation in a frame. A toothed ratchet wheel is connected to the spool and rotates therewith. The retractor has a crash sensor. A locking pawl is arranged to be pivotable from a first position in which it is spaced from the ratchet wheel to a second position in which it engages with the ratchet wheel to lock the spool against rotation, in response to activation of the crash sensor. A pretensioner is responsive to the crash sensor to rapidly rewind webbing onto the spool. A venting arrangement for the pretensioner includes a chamber having an inside side wall and an inside wall. A vent hole is formed in the side of the chamber with a seal for the vent hole. An axially slidable member is mounted in the chamber and biased away from one end of the chamber. The slidable member is connected to the locking pawl, so that it slides in the chamber when the locking pawl pivots.

Abstract: A guide loop height adjustment arrangement for a driver's seat belt has a drive that raises and lowers a guide loop in response to a sensed change in the position of the driver's mirror. The change in the mirror position is indicative of the presence of a seat occupant with a different shoulder height from the preceding seat occupant and therefore causes the guide loop height to be adjusted.