rockshaft


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rock·shaft

 (rŏk′shăft′)
n.
A shaft that oscillates or rocks upon its bearings but does not revolve.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

rockshaft

(ˈrɒkˌʃɑːft)
n
(Automotive Engineering) a shaft that rotates backwards and forwards rather than continuously, esp one used in the valve gear of a steam engine
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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A new split rockshaft implement lift--one that allowed separate control of forward and aft cultivators--was available on the MT.
How John Deere's small tractors replaced the horse: making the move from horse power to horsepower on America's small farms
A continuing capital expenditure programme saw the order of a new rockshaft tower, which arrived at Boulby this summer, to significantly increase its maximum production potential.
Tough production knocks mining firm's profits
Unique rockshaft mounted disk-based fertilizer openers are combined with shank-type seed openers on a flexing frame.
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Other standard features of the 2000 Twenty series tractors include four-wheel drive, position control rockshaft, standard steering brakes, and high-backed contoured suspended operator seat.
Small tractors target big performance: Deere unveils compact Twenty series tractors; three new models designed to incorporate "big tractor" features

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