Triple Inverse Parallelogram
A third similar inverse parallelogram is connected to a double inverse parallelogram.
Similar ratio for this case is 2.
The red crank makes 3 revolutions while the violet one makes 2 and the green makes 1.
Further similar connections allow getting transmission ratio of 4, 5, 6 …
The mechanism consists of only bars and revolution joints.
There may be difficulty in arranging the crank bearing supports.
The measure to overcome dead positions is not shown.