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  2. Differential pulley - Wikipedia

    en.wikipedia.org/wiki/Differential_pulley

    This leads to a mechanical advantage: the force needed to lift a load is only a fraction of the load's weight. At the same time, the distance the load is lifted is smaller than the length of chain pulled by the same factor. This factor (the mechanical advantage MA) depends on the relative difference of the radii r and R of the connected pulleys:

  3. Hoist (device) - Wikipedia

    en.wikipedia.org/wiki/Hoist_(device)

    Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.

  4. Rigging (material handling) - Wikipedia

    en.wikipedia.org/wiki/Rigging_(material_handling)

    A team of riggers design and install the lifting or rolling equipment needed to raise, roll, slide or lift objects such as heavy machinery, structural components, building materials, or large-scale fixtures with a crane, hoist or block and tackle. Rigging comes from rig, to set up or prepare.

  5. This device helps you lift really heavy objects with ease - AOL

    www.aol.com/lifestyle/device-helps-lift-really...

    This nifty little tool helps you lift heavy objects like large panels of wood or drywall. It clamps onto the top of the panel and has a handle that lets you carry these large slabs right on your side.

  6. Block and tackle - Wikipedia

    en.wikipedia.org/wiki/Block_and_tackle

    The mechanical advantage is 2, requiring a force of only 50 N to lift the load. A block and tackle is characterized by the use of a single continuous rope to transmit a tension force around one or more pulleys to lift or move a load. Its mechanical advantage is the number of parts of the rope that act on the load. The mechanical advantage of a ...

  7. Crane (machine) - Wikipedia

    en.wikipedia.org/wiki/Crane_(machine)

    The generally accepted definition of a crane is a machine for lifting and moving heavy objects by means of ropes or cables suspended from a movable arm. As such, a lifting machine that does not use cables, or else provides only vertical and not horizontal movement, cannot strictly be called a 'crane'. Types of crane-like lifting machine include:

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