When yellow bar turns 90 deg. faces A and B are displayed towards the bisector of angle between them. Yellow bar, violet bar and pink V-arm create a parallelogram mechanism.

Yellow and blue gears have the same tooth number.

Yellow gear is fixed to yellow bar.

Blue gear is fixed to blue bar.

The mechanism can be applied for furniture cabinets or monitor supports.

Disadvantage: yellow and blue bars are not in line at open position.