We’re often asked whether to use a block and tackle or a
differential pulley for a particular job. We’re also often asked whether rope
will suffice or whether it needs to be chain. Generally the heavier the load,
the more likely the better tool for the job is a differential pulley using
chain.
Definitions:
Block and Tackle: A system of 2 or more pulleys with a rope or
cable threaded between them, usually used to lift or pull loads. The pulleys
are assembled together to form blocks and then blocks are paired so that one is
fixed and one moves with the load.
Differential Pulleys: Also called “Weston differential pulley,”
or “chain hoist”. A pulley used to manually lift very heavy objects like car
engines. It is operated by pulling up on the slack section of a continuous
chain that wraps around pulleys. The relative size of 2 connected pulleys
determines the maximum weight that can be lifted by hand.
Example Block and Tackle and Differential Pulley Jobs. Click
here: https://www.ronstanindustrial.com/should-i-use-a-block-and-tackle-or-a-differential-pulley/
The less friction in the equipment the more efficiently the
block and tackle and differential pulley will work. For block and tackles we
recommend Toulon roller balls and Toulon bushings on polished shafts. For
differential pulleys we recommend steel ball bearings, either sealed or
greased.
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