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Reference.org
Pulley
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<p>A pulley is a <a href="/facts/Wheel/SlIWX3xd">wheel</a> on an <a href="/facts/Axle/Eo5jWI3f">axle</a> or <a href="/facts/Shaft_(mechanical_engineering)/LqK0yJKP">shaft</a> enabling a taut cable or <a href="/facts/Belt_(mechanical)/k2zQ5tGv">belt</a> passing over the wheel to move and change direction, or transfer power between itself and a shaft. </p><p>A pulley may have a <a href="/facts/Groove_(machining)/3UXJSVdf">groove</a> or grooves between <a href="/facts/Flange/6Hofs5ok">flanges</a> around its <a href="/facts/Circumference/r1rntU0f">circumference</a> to locate the cable or belt. The drive element of a pulley system can be a <a href="/facts/Rope/heTalcCM">rope</a>, <a href="/facts/Wire_rope/9z4b9SYB">cable</a>, belt, or <a href="/facts/Chain/KlYIprGC">chain</a>. </p>