Pre-tensioner
A
pre-tensioner is a device that, in the event of a collision,
tightens the seat belt having being triggered by a gas generator
or small pyrotechnic charge. When activated, the pretensioner
tightens the webbing of the belt. Because the webbing is now
tighter across the body, occupants participate earlier in
the vehicle ride down. Consequently, loadings on the body
are distributed more uniformly over the entire restraint sequence,
and the risk of injury is reduced.
Source: Audi
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