rock shaft
/ˈrɒk ʃɑːft/ /ˈrɒk ʃaft/Mechanics
noun
A shaft which rocks back and forth about its axis rather than turning continuously; especially (a) one causing valves in an engine to open and close; (b) one on a tractor for giving oscillatory motion to an attached implement.
Origin
Mid 19th century; earliest use found in National Gazette (Philadelphia). From rock + shaft.
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