rock shaftn.

Brit.

/ˈrɒk ʃɑːft/,

/ˈrɒk ʃaft/, U.S.

/ˈrɑk ˌʃæft/

Origin: Formed within English, by compounding. Etymons: rock v.¹, shaft n.²

Etymology: < rock v.¹ + shaft n.² Compare rocking adj. 2.

Mechanics.

A shaft which rocks back and forth about its axis rather than turning continuously; esp. (a) one causing valves in an engine to open and close; (b) one on a tractor for giving oscillatory motion to an attached implement.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > shaft > [noun] > rock

rock shaft1833

weigh-bar1841

rocker shaft1842

weigh-shaft1867

1833 National Gaz. & Literary Reg. (Philadelphia) 11 Jan. 1/4 The eccentric has no lateral motion, but is reversed by moving the rod to the opposite side of the centre of motion of the rock-shaft.

1850 Brit. Patent 13,159 3 My contrivance is to accomplish the ‘cut off’ at any portion of the stroke with the one valve, eccentric or cam, and the same lifting rods and rock shaft.

1896 Cosmopolitan Feb. 421/1 On the bottom of the vehicle, in front of the operator is a rock shaft, upon which the operator places his foot to manage the vehicle.

1932 Sci. News Let. 6 Aug. 87/1 The rock shaft is provided with an arm which receives the required vibratory motion by a connecting rod.

2001 Furrow Mar. 4/1 (advt.) It's built with..features like a big 5.5-inch rockshaft and a floating hitch.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rock shaft
释义	rock shaftn. Brit. /ˈrɒk ʃɑːft/, /ˈrɒk ʃaft/, U.S. /ˈrɑk ˌʃæft/ Origin: Formed within English, by compounding. Etymons: rock v.¹, shaft n.² Etymology: < rock v.¹ + shaft n.² Compare rocking adj. 2. Mechanics. A shaft which rocks back and forth about its axis rather than turning continuously; esp. (a) one causing valves in an engine to open and close; (b) one on a tractor for giving oscillatory motion to an attached implement. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > shaft > [noun] > rock rock shaft1833 weigh-bar1841 rocker shaft1842 weigh-shaft1867 1833 National Gaz. & Literary Reg. (Philadelphia) 11 Jan. 1/4 The eccentric has no lateral motion, but is reversed by moving the rod to the opposite side of the centre of motion of the rock-shaft. 1850 Brit. Patent 13,159 3 My contrivance is to accomplish the ‘cut off’ at any portion of the stroke with the one valve, eccentric or cam, and the same lifting rods and rock shaft. 1896 Cosmopolitan Feb. 421/1 On the bottom of the vehicle, in front of the operator is a rock shaft, upon which the operator places his foot to manage the vehicle. 1932 Sci. News Let. 6 Aug. 87/1 The rock shaft is provided with an arm which receives the required vibratory motion by a connecting rod. 2001 Furrow Mar. 4/1 (advt.) It's built with..features like a big 5.5-inch rockshaft and a floating hitch. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.1833
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