This can work only when the gate is not too wide and the joint between green panel and blue pivot is of small friction type (linear ball bearings for example).
The cylindrical stopper keeps the panel immobile at its open position when open angle is larger than 90 deg.
This design has an error: the carrying wheel must be under the center of mass of the gate, near the middle, but not under corner.
STEP files of this video:
[ Ссылка ]
Inventor files of this video:
[ Ссылка ]
