• A pulley for driving machines, etc., having two or more parts or steps of different diameters; a pulley having a conical shape.
Cone' pul'ley A pulley for driving machines, etc., having two or more parts or steps of different diameters; a pulley having a conical shape. 
A one-piece stepped pully having two or more diameters.
A one-piece stepped pulley having two or more diameters. See also: Belt Drive.
(on a lathe) a pulley consisting of a conelike arrangement of graduated, concentric pulleys for driving the headstock at different speeds.