ratchet

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ratchet

1. a device in which a toothed rack or wheel is engaged by a pawl to permit motion in one direction only
2. the toothed rack or wheel forming part of such a device
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

ratchet

[′rach·ət]
(design engineering)
A wheel, usually toothed, operating with a catch or a pawl so as to rotate in only a single direction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Introducing the Schapery model and a new method of parameter identification, the uniaxial ratcheting of PEI polymer can be simulated by the nonlinear viscoelastic constitutive model in integral form, even if the original model over-predicts the ratcheting of PEI observed in the cyclic tension--tension tests.
The effects of the following three parameters were studied in multiaxial ratcheting tests: (a) axial stress, (b) shear strain amplitude, and (c) shear strain rate.
It is seen that the ratcheting strain reached approximately 1% after 10 cycles.
[16] proposed a semiempirical model to describe the steady accumulation of ratcheting strain vs.
The self-adjusting ratcheting pipe wrenches added to the Proto tool lineup has no nut; instead, it has a spring-loaded hook jaw that adjusts its opening to the work size and tightens as the user bears down on the handle.
The new RIDGID RC-1625 ratcheting plastic pipe and tubing cutter, from RIDGID, has a large capacity and an advanced blade design that reduces required cutting force.
That law whittles the estate-tax rate down to 45 percent by 2007 while simultaneously ratcheting up personal exemptions--the amount taxpayers can pass to heirs free of estate tax--over the next four years.
Already on the drawing beards of one of Duncan's competitors is a yo-yo with an even finer ratcheting mechanism.
The No-Play[TM] ratcheting screwdriver is a patent-pending orthopedic and surgical instrument designed to eliminate movement between the handle and the shaft of the screwdriver.