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Earlier today I came across a creep testing machine that uses a safety belt as a mechanism for stopping loads from hitting the ground. It is probably the first time I saw a safety belt roll outside of a car and it got me wondering how do safety belts work?

What is the primary mechanism that they are using for engaging and disengaging? I expect it to be entirely mechanical in nature, however I can't put my finger on it.

Is it at all similar to the ratchet or the freewheel mechanism?

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    $\begingroup$ "centrifugal clutch" there are some weights that fling outwards and engage in some teeth when the reel spins too fast $\endgroup$ – Jonathan R Swift Oct 28 '20 at 7:20
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    $\begingroup$ @JonathanRSwift Might as well make that an answer. $\endgroup$ – Eric S Oct 28 '20 at 14:01
  • $\begingroup$ I'm on mobile so formatting something nice with a picture etc seemed too much effort. I like my answers to always be high quality so just bunged the info in a comment to help out any other people with more time to answer well 😉 $\endgroup$ – Jonathan R Swift Oct 28 '20 at 15:15
  • $\begingroup$ I'll wait until you post then :-) $\endgroup$ – NMech Oct 28 '20 at 15:21
  • $\begingroup$ @JonathanRSwift But you still have power to do winkies! $\endgroup$ – StainlessSteelRat Oct 28 '20 at 15:29

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