- a wheel, with teeth on the edge, into which a pawl drops or catches, as to prevent reversal of motion or convert reciprocating motion into rotatory motion.
Origin of ratchet wheel
First recorded in 1770–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ratchet wheel
The ratchet-wheel R is attached to the hub of the driving-wheel.How it Works
A detail of one of them is shown at v in Fig. 1380, where x is the ratchet-wheel.
An' this ratchet-wheel isn't on the pawl prop'ly—not like what this book says it ought to be.More William
The oscillating of the tappet-arm produces an intermittent rotary motion of the ratchet-wheel.The Library of Work and Play: Mechanics, Indoors and Out
Fred T. Hodgson
When the tympanum vibrates under the influence of the voice, the stylus acts as a pawl and turns a ratchet-wheel.Heroes of the Telegraph