Seat belt is very essential component in any vehicle
regarding our safety; it holds us at time of any accident. Prevent us to strike
against steering and dashboard.
Let us understand how it works.
Standard seat belts have a retractor mechanism.
The belt webbing is connected to retractor mechanism.
The central element in retractor is spool. The central
element in the retractor is a spool, which is attached to one end of the
webbing. Inside the retractor, a spring applies a rotation force, or torque, to
the spool. This works to rotate the spool so it winds up any loose webbing.
When you pull the webbing out, the spool rotates
counter-clockwise, which turns the attached spring in the same direction.
Effectively, the rotating spool works to untwist the spring. The spring wants
to return to its original shape, so it resists this twisting motion. If you
release the webbing, the spring will tighten up, rotating the spool clockwise
until there is no more slack in the belt.