A differential pulley, sometimes called a "chain hoist," or sometimes colloquially called a "chain fall," can lift very large masses a short distance. The two fixed pulleys at the top (which are attached to each other and rotate together) are of unequal radii, R and r. An endless chain passes around the pulleys and hangs in a loop, as shown in Figure 1. The fixed pulleys are toothed to avoid slippage of the chain.

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  • A differential pulley, sometimes called a "chain hoist," or sometimes colloquially called a "chain fall," can lift very large masses a short distance. The two fixed pulleys at the top (which are attached to each other and rotate together) are of unequal radii, R and r. An endless chain passes around the pulleys and hangs in a loop, as shown in Figure 1. The fixed pulleys are toothed to avoid slippage of the chain. The difference in radii of the fixed pulleys (R - r) can be made very small, making the mechanical advantage of this pulley system very large. Neglecting friction, the mechanical advantage (MA) is MA = 2·R/(R - r). Notice, as (R - r) approaches zero, MA becomes extremely large, and the movable pulley now rises very slowly, almost no longer rising, even though you are pulling long lengths of chain downward at Fz. Hence, the huge mechanical advantage as r approaches R.
  • A differenciális csigasor vagy differenciál-csigasor az álló- és mozgócsigákból álló csigasorok azon változata, amely két különböző átmérőjű, egymáshoz erősített állócsigából, egy különálló mozgócsigából, valamint az ezeken végigfutó egyetlen, végtelenített láncból áll.
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  • A differential pulley, sometimes called a "chain hoist," or sometimes colloquially called a "chain fall," can lift very large masses a short distance. The two fixed pulleys at the top (which are attached to each other and rotate together) are of unequal radii, R and r. An endless chain passes around the pulleys and hangs in a loop, as shown in Figure 1. The fixed pulleys are toothed to avoid slippage of the chain.
  • A differenciális csigasor vagy differenciál-csigasor az álló- és mozgócsigákból álló csigasorok azon változata, amely két különböző átmérőjű, egymáshoz erősített állócsigából, egy különálló mozgócsigából, valamint az ezeken végigfutó egyetlen, végtelenített láncból áll.
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  • Differential pulley
  • Differenciális csigasor
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