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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)

   Rigging is both a noun, the equipment, and verb, the action of designing and installing the equipment, in the preparation to move objects. 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 ...

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. 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:

7. Derrick - Wikipedia

   en.wikipedia.org/wiki/Derrick

   The safe working load of the Hallen is between 10 and 80 tonnes. In a Hallen Universal derrick, which has no Hallen D-Frame, the halyard has an extended length since it runs through further blocks on the centerline. The Universal Hallen derrick, replacing the D-Frame option, is a kind of traditional topping lift.