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I am trying to figure out what the exact term is for the clutch system used in a roll-up window shade.

I thought they were called centrifical clutches, but that typically gives me the opposite results like what is used in an automatic vehicle. Where speed causes it to engage.

Basically I want to look up some existing designs because I'm trying to create a product that uses one.

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It is a spring-loaded ratchet and pawl system. the pawl mechanism is unlocked by the centripetal force of the initial rolling of the shade by a user.

Here is a diagram. diagram.

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A roller or inclined ramp clutch may be what you are talking about.

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    $\begingroup$ also can be known as a sprag clutch $\endgroup$
    – fred_dot_u
    Nov 24 '19 at 20:00

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