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Friction Drive

(1) Where power is transferred from one smooth-rimmed wheel to another by the friction caused by bringing them forcibly together. They may have flat or bevelled faces and may be faced with end-grain wood or with iron against wood. A form of clutch used on sack hoists and other devices. (2) Typically the friction drive for a sack hoist from a wheel on the upright shaft. See SLACK BELT.