A linkage which converts circular to linear motion using a hinged square.
Sarrus Linkage
See also
Hart's Inversor, Linkage, Peaucellier InversorExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Sarrus Linkage." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SarrusLinkage.html