A combination of parallelogram mechanisms and gears.
The gears are fixed with the bars.
It can be applied for folding barriers, gates, eaves or lamps.
By similar connecting of bars the barrier can be very long.
Link for downloading STEP files of this video:
http://www.mediafire.com/download/aoaoalgy8gt0go6/FoldBarrier4STEP.zip
Inventor files of this video:
http://www.mediafire.com/download/anu507fn074q3u6/FoldBarrier4Inv.zip
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