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pulley noun [C]. âº a âpiece of âequipment for âmoving âheavy âobjects up or down, consisting of a âsmall âwheel over which a ârope or âchain âattached to the âobject can be âeasily âraised or âlowered: The âblocks of âstone had to be âlifted into âposition with a âsystem of pulleys.
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell which does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain. Hero of Alexandria identified the pulley as one of six simple machines used to lift weights.