| the ropes or chains and blocks used in a hoisting tackle. |
block and tackle  (click for larger image in new window) n. An apparatus of pulley blocks and ropes or cables used for hauling and hoisting heavy objects. |
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. |