Definitions for: Ratchet

[n] mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
[v] move by degrees in one direction only, as of toothed wheels

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

2. A mechanism composed of a ratchet wheel, or ratch, and
pawl. See Ratchet wheel, below, and 2d Ratch.

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.

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.

Synonyms: rachet, rachet up, ratch, ratchet down

See Also: advance, click, detent, dog, go on, march on, mechanical device, move on, pass on, pawl, progress, ratchet screwdriver, ratchet wheel, spiral ratchet screwdriver

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