[haihoang_boy]

AE/AF= BD/CD
When pink and green bars are horizontal, grey and blue gars are vertical.
With small oscillating angle A of the pink bar, yellows platform is always approximately horizontal and move approximately vertically.
The video shows:
A = +/-10 deg.
Max inclined angle of the platform = 0.25 deg.

°o.O YouTube Player O.o°

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