Ratchet Ratch"et (-[e^]t), n. [Properly a diminutive from the same word as rack: cf. F. rochet. See 2d {Ratch}, {Rack} the instrument.] 1. A pawl, click, or detent, for holding or propelling a ratchet wheel, or ratch, etc. [1913 Webster]

2. A mechanism composed of a ratchet wheel, or ratch, and pawl. See {Ratchet wheel}, below, and 2d {Ratch}. [1913 Webster]

{Ratchet brace} (Mech.), a boring brace, having a ratchet wheel and pawl for rotating the tool by back and forth movements of the brace handle.

{Ratchet drill}, a portable machine for working a drill by hand, consisting of a hand lever carrying at one end a drill holder which is revolved by means of a ratchet wheel and pawl, by swinging the lever back and forth.

{Ratchet wheel} (Mach.), a circular wheel having teeth, usually angular, with which a reciprocating pawl engages to turn the wheel forward, or a stationary pawl to hold it from turning backward. [1913 Webster] [1913 Webster]

Note: In the cut, the moving pawl c slides over the teeth in one direction, but in returning, draws the wheel with it, while the pawl d prevents it from turning in the contrary direction. [1913 Webster]

The Collaborative International Dictionary of English. 2000.


Look at other dictionaries:

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  • ratchet — [rach′it] n. [earlier rochet < Fr, lance head, distaff < It rocchetto, bobbin, spindle, dim. of rocca, distaff < Goth * rukka, akin to OHG roccho, spindle, distaff < IE base * ruk(k) , spun yarn] 1. a toothed wheel (in full ratchet… …   English World dictionary

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  • ratchet — [[t]ræ̱tʃɪt[/t]] ratchets, ratcheting, ratcheted 1) N COUNT In a tool or machine, a ratchet is a wheel or bar with sloping teeth, which can move only in one direction, because a piece of metal stops the teeth from moving backwards. The chair has… …   English dictionary

  • ratchet — /rach it/, n. 1. a toothed bar with which a pawl engages. 2. (not in technical use) a pawl or the like used with a ratchet or ratchet wheel. 3. a mechanism consisting of such a bar or wheel with the pawl. 4. See ratchet wheel. 5. a steady… …   Universalium

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  • ratchet — ratch|et1 [ˈrætʃıt] n [Date: 1600 1700; : French; Origin: rochet, from Old French rocquet point of a spear ] a machine part consisting of a wheel or bar with teeth on it, which allows movement in only one direction ratchet 2 ratchet2 v ratchet up …   Dictionary of contemporary English

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