Open_Closed Plate

Violet crank, green conrod and red slider create a slider-crank mechanism, where the conrod is shorter than the crank.
Thanks to chain drive (orange, grey sprockets and yellow chanin) the mechanism is driven by white motor. Driving force is applied to green sprocket fixed to the conrod.
Force applied to red slider is not workable due to facing dead positions.
Force applied to violet crank is not workable due to facing 90 deg. pressure angle.
The Open/Closed plate occupies the same place after flipping. The flipping happens only in front space of the plate.
If the motor must be distant from the plate, it’s possible to use Bowden cable driver to transmit torque to the green gear.
This mechanism may be applied for License Plate Flipper - Like James Bond:

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