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Reference.org
Conveyor pulley
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<p>A conveyor pulley is a mechanical device used to change the direction of the belt in a <a href="/facts/Conveyor_belt/SC1VXcm6">conveyor system</a>, to drive the belt, and to tension the belt. Modern pulleys are made of rolled shells with flexible end disks and locking assemblies. Early pulley engineering was developed in <a href="/facts/Australia/qLHpbppq">Australia</a> by Josef Sitzwohl in 1948 and later by Helmuth Lange and Walter Schmoltzi in <a href="/facts/Germany/paluuWBX">Germany</a>. </p>