block and tackle

noun
the ropes or chains and blocks used in a hoisting tackle.

Origin:
1830–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
block and tackle
 
n
a hoisting device in which a rope or chain is passed around a pair of blocks containing one or more pulleys. The upper block is secured overhead and the lower block supports the load, the effort being applied to the free end of the rope or chain

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
block and tackle   (blŏk)  Pronunciation Key 
An arrangement of pulleys and ropes used to reduce the amount of force needed to move heavy loads. One pulley is attached to the load, and rope or chains connect this pulley to a fixed pulley. Each pulley may have multiple grooves or wheels for the rope to pass over numerous times. Pulling the rope or chain slowly draws the load-bearing pulley toward the fixed one with high mechanical advantage.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Hoist tools and equipment to tree trimmers, and lower branches with ropes or
  block and tackle.
Attempting to move objects heavier than the block and tackle can safely support
  may damage the tool or cause injury.
They use block and tackle, pulleys, or other lifting devices.
Lift and align components into position, using hoist or block and tackle.
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