Four bar linkage 8c

A special case of the 4-bar linkage. Input: pink crank. Output: green crank rotating irregularly. The unusualness: a working cycle of the mechanism corresponds 2 revolutions of the input. It happens because: 1. The sum of the lengths of the two adjacent links is equal to the sum of the lengths of the other two links. A B = C D A: length of pink crank (=35) B: length of yellow conrod (=15) C: length of green crank (=40) D: distance between fixed axes of cranks (=10) 2. There are measures to overcome dea