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Example of a differential pulley
A differential pulley —also called "Weston differential pulley", sometimes "differential hoist", "chain hoist", or colloquially "chain fall"— is used to manually lift very heavy objects like car engines. It is operated by pulling upon the slack section of a continuous chain that wraps around two pulleys on a common shaft. (The two pulleys are joined together such that they rotate as a unit on the single shaft that they share.) The relative sizing of the two connected pulleys determines the maximum weight that can be lifted by hand. If the pulley radii are close enough, then the load will remain in place (and not lower under the force of gravity) until the chain is pulled.[1]
^Macauley, David; Ardley, Neil (1998). The New Way Things Work. Boston, USA: Houghton Mifflin Company. p. 56. ISBN 0-395-93847-3.
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die on which the sheet metal is bent during deep drawing. A toothed belt-pulley design provides improved efficiency for mechanical power transmission using...
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