Model 03: double straight line mechanism according Hoecken
Kinematic scheme:
Dimensions:

Measured at
model [m] 
a 
0.080 
b 
0.175 
c 
0.175 
d 
0.227 
f 
0.175 
Explanation:
Point C of the coupler plane describes a Vshaped curve
that has two straight line approximations. The lengths b, c and f are equal.
The fixed point of rocker b lies on the symmetry line of the curve.
Literature:
Remarks: