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A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft.

An arm on a rock shaft, to give motion to the shaft or to obtain motion from it. Compound lever, a machine consisting of two or more levers acting upon each other. -- Lever escapement. See Escapement. -- Lever jack. See Jack, n., 5. -- Lever watch, a watch having a vibrating lever to connect the action of the escape…

or delivers it through a spout; a lift pump. -- Lifting rod, a vertical rod lifted by a rock shaft, and imparting motion to a puppet valve; -- used in the engines of river steamboats. -- Lifting sail (Naut.), one which tends to lift a vessel's bow out of water, as jibs and square foresails.

Same as Rock shaft. Rocker arm (Mach.), an arm borne by a rock shaft. To be off one's rocker, to be insane.

waying, rolling, or back-and-forth movement; used for rocking. Rocking shaft. (Mach.) See Rock shaft.

A rock shaft.

A piece generally projecting from a rotating or swinging piece, as an axle or rock shaft, for the purpose of raising stampers, lifting rods, or the like, and leaving them to fall by their own weight; a kind of cam.