Hoecken linkage

[[File:Hoecken's Linkage.gif|thumb|Animation of the Hoecken linkage Dimensions (unit length $a$):

Link 1 (distance between ground joints): $a$]]

In kinematics, the Hoecken linkage (named for Karl Hoecken) is a four-bar linkage that converts rotational motion to approximate straight-line motion. The Hoecken linkage is a cognate linkage of the Chebyshev linkage and Chebyshev's Lambda Mechanism.

The linkage was first published in 1926.

A generalization of the Hoecken linkage is Wittgenstein's rod.