'Rock shaft' definitions:
Definition of 'Rock shaft'
From: GCIDE
- 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]