Rock shaft

Rock shaft
Rock shaft Rock" shaft` [Cf. {Rock}, v. i.] (Mach.) 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}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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