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Welcome to Crash
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* Half million people are killed every year in the traffic accidents!!!
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Seat Belt System
Reduces risk of fatal accidents by 45%
Rib and abdominal injuries may be suffered,especially if the seat belt is not correctly positioned.
Types
Two point seat belt
Three point seat belt
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Height adjusters
Improve the seat belts' protective effect by
achieving correct belt geometry.Increase the ease and the comfort of use for car
occupants of above or below average height.
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Buckle
Must withstand forces of at least two tons.
must be easy to open even when heavily loaded.
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Retractor
Two locking sensors that work independently.
Vehicle sensor detects sudden deceleration of the vehicle.Webbing sensor detects violent pull-outs of webbing from the
retractor.
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Pretensioners
Restrains an occupant as early as possible in a crash.
Reduce the load on the occupant in a violent crash.Tighten the belt during the very first fractions.
Reduce the risk of "submarining.
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Seat Belt Beam
(Ready to be installed in vehicle)
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Frontal air bags
Reduce the fatalities in head-on collisions by 25-30%.
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IMPACT---->>>SENSORS---->>>INFLATOR TRIGERRED
--->>>GAS GENERATED--->>>AIRBAG INFLATION--->>>
COVER SPLIT--->>>INFLATES IN FRONT OF OCCUPANT
--->>>DEFLATION
How does an airbag work?
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How does an airbag work? (Contd)
In a frontal impact of sufficient severity (comparable to a collision into a
solid wall at 10-14 MPH or above), sensors in the vehicle detect thesudden deceleration and trigger the inflator module. This causes the solid
chemical propellant sealed inside the inflator, principally sodium azide,
to undergo a rapid chemical reaction. This reaction produces primarily
nitrogen gas, the same gas that makes up 80 percent of the air we
breathe. The gas inflates a woven nylon bag packed inside the steering
wheel hub or the instrument panel for the front seat passenger. The bag
inflates in less than one-twentieth of a second, splitting open itsprotective cover, and inflating in front of the occupant. As the occupant
contacts the bag, the nitrogen gas is vented through openings in the back
of the bag, which helps to cushion forward movement.
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Sideimpact airbag
Side-impact collisions account for a quarter of all injuries to car
occupants.
Account for more than one third of the serious and fatal injuries.
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