link motion

noun

a mechanism controlling the valves of a steam engine, consisting of a slotted link terminating in a pair of eccentrics

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for link motion

Historical Examples of link motion

Stephenson's link-motion valve-gear is used on most locomotives.
The Story of Great Inventions
Elmer Ellsworth Burns
Mr. Baldwin's characteristic reply was, "Then they shall have link-motion hereafter."
Illustrated Catalogue of Locomotives
M. Baird, et. al..