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ratchet wheel

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noun
  1. 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

Historical Examples

  • The ratchet-wheel R is attached to the hub of the driving-wheel.

    How it Works

    Archibald Williams

  • 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

    Richmal Crompton

  • The oscillating of the tappet-arm produces an intermittent rotary motion of the ratchet-wheel.

  • When the tympanum vibrates under the influence of the voice, the stylus acts as a pawl and turns a ratchet-wheel.