GENERAL -
Supplemental Restraint System (SRS)
and Seatbelts with Pre-tensioner
00-25
SEAT BELT WITH PRE-TENSIONER
The seat belt with pre-tensioner has a pre-tensioner
operating mechanism and a G-sensor which detects
the force from an impact built into the seat belt
retractor.
The G-sensor is a mechanical-type sensor which
includes components such as a weight which moves
as a result of the impact from a collision, and a
spike which strikes a charge and causes it to
detonate.
Thus the pre-tensioner is equipped with a safety
mechanism to prevent mis-operation during
maintenance operations such as removal and
installation of the seat belt.
The safety mechanism operates automatically
when the retractor top mounting screw is removed
during removal of the seat belt.
When the retractor top mounting screw is removed,
the force of the spring plate causes the tab at the
lower edge of plate (A) to push in the pin of the
G-sensor, which prevents the weight inside the
G-sensor from moving.
At the same time, the retractor bracket and the
top of plate (A) become separated. A stopper is
inserted into the gap thus formed by the force from
a spring to prevent the tab from being removed
from the pin if an outside force is applied to plate
(A).
Stopper
Retractor bracket
Plate (A)
Spring
Spring plate
Tab
Plate (A) (when safety
mechanism is disengaged)
Plate (A) (when safety
mechanism is engaged)
Stopper
G-sensor structure
Charge
Spike
Pin (when safe-
ty mechanism is
engaged)
Sensor
weight
Tab
Pin
Tab
Summary of Contents for MUT-II
Page 34: ...NOTES ...
