This example shows the use of the Simscape™ Lever block in a linkage mechanism. The first (L_1) and the fourth (L_4) linkages are first class levers with the fulcrum at the end. The third linkage (L_3) is a second class lever with the fulcrum in the middle. The second linkage (L_2) is a summing lever driven by the first and the third linkages.
The mechanism is excited by two force sources. One source abruptly applies force at 1 s to linkage L_1, then the other source abruptly applies force at 2 s to linkage L_3.