Hoeckens linkage

The Hoeckens linkage is a four-bar linkage that converts rotational motion to approximate straight-line motion. It is named after Karl Hoecken (1874−1962).
The Hoeckens linkage is a cognate linkage of the Chebyshev linkage and Chebyshev's Lambda Mechanism.
The linkage was first published in 1926.
A generalization of Hoeckens linkage is Wittgenstein's rod.