For this linkage r1 : r2 : r3 = 2 : 2.5 : 1 and r2 = r4. Point P is located midway along r3.
This linkage is a Grashof double rocker.
In this example:
r1 = 4 , r2 = 5 , r3 = 2 , r4 = 5 , rp = 1
theta1 = 0 , beta = 0
To see animations of this linkage select the links below: