The working surface of pulley 2 is along an Archimedean spiral with the equation p=aφ, where a is the constant factor of the spiral. Pulley 2 rotates about fixed axis A. Load 1 is suspended on one end of flexible link (rope) 3 whose other end is attached to pulley 2. When pulley 2 rotates counterclockwise, link 3 is wound on the pulley and hoists load 1. The velocity of the centre of gravity 0 of load 1 is v=ω*sqrt(a²+ρ²) where to is the angular velocity of pulley 2.
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