Seatbelts use a spool mechanism that allows normal movement but locks instantly during sudden forward jerks: when the body moves slowly, the spool spins freely and the belt slides out, but during a crash, the rapid forward motion causes the spool to spin faster, pushing two metal pieces outward to lock into the teeth and stop the spool, preventing the belt from extending and holding the occupant back.
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How A Seat Belt Locks In A Crash 😮追加:
If you lean forward slowly, a spool inside spins and the seatbelt slides out so you can move. But if your body jerks forward in a crash, it makes that spool spin much faster, which pushes two metal pieces outward, locking them into the teeth and stopping the spool [music] instantly. Now the belt can't extend, which holds you back.
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