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How SEAT BELTS work

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by

Caroline Tâo Niang Liem

on 28 April 2014

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Transcript of How SEAT BELTS work

SEAT BELTS
HOW WORK
Introduction: STATISTICS
GENERAL INFORMATION
purpose:
counteract inertia, reduce injuries,
transfer stopping force to rib cage & pelvis

area of application:
cars, trains, buses,
roller coasters, infant seats

material:
special webbing, durable + flexible
TYPES OF SEAT BELTS
CONCLUSION
- occasionally seat belts cause injuries or death
BUT
- they save thousands of lives yearly
- they reduce the risk of injury/death by 50%
- because of the material and the retraction
systems they are almost comfortable and
easy to strap on
EXTEND AND RETRACT
distinction by form
distinction by function
"Seat belts are the single most effective traffic safety device for preventing death and injury."
SOURCES
1) auto.howstuffworks.com
2) www.nsc.org/safety_road/DriverSafety/Pages/SeatBelts.aspx (National Safety Council)
3) www.sjtsa.org/TYPES%20OF%20SEAT%20BELTS.pdf
4) www.dvr.de/download2/p2850/2850_0.pdf (Deutscher Verkehrssicherheitsrat)
5) www-nrd.nhtsa.dot.gov/Pubs/811153.PDF (National Highway Traffic Safety Administration)
6) www.velm.com/de/product-outline.html
- risk of crash injuries reduced by
50%
-
88%
of US citizens use seat belts
-
98%
of German citizens use seat belts
-
15,000
lives a year safed by seat belts
-
40-50%
of killed crash victims unbelted

- National Safety Council
2-point: lap 2-point: sash





3-point 4-point




5-point, 6-point, 7-point, combinations
two basic principles:

- "
rigid
" seat belts
tightened by passenger when strapping on
-
automatically retracting
seat belts
different systems
- belt is connected to a
retractor mechanism
- main element: a
spool
connected to a spring
- the rotation spool works to
untwist the spring
- the spring wants to
return in its original shape
- central element is a
pendulum
- pendulum
starts swinging
forward
when the car suddenly stops
- a
pawl
catches hold of a
blocking device

attached to the spool
1. Systems initiated by car’s movement
Two sorts of locking systems
2. Systems initiated by the belt’s movement
- activating force =
speed of the spool
rotation
- when the spool spins quickly, a
centrifugal
force
drives a
lever
- lever pushes a
cam piece
attached to a
pawl
- pawl catches hold in a
blocking device
→ All drivers and passengers are reminded to
fasten seat belts!
THE END.
The End.
Full transcript