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Ratchet - a mechanism consisting of a toothed ratchet wheel and a pivoted bar or pawl which drops to prevent the wheel returning. The combination of ratchet wheel and pawl means a rod to which the wheel is attached can rotate in only one direction. As a rule ratchets are fitted to the winches or drive mechanisms so that they can be kept wound up until it is time for them to operate and discharge their potential energy. |
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