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pawl:see ratchet and pawlratchet and pawl,
mechanical device that permits motion in one direction only. The ratchet is usually a wheel with slanting teeth. The pawl is a lever tangential to the wheel with one end resting on the teeth.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The driving link or holding link of a ratchet mechanism, permits motion in one direction only.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
a pivoted lever shaped to engage with a ratchet wheel to prevent motion in a particular direction
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005