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2. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   He claimed that many engineering firms conceded on the difficulty of efficiently disengaging the chain from the teeth as the pulleys turned, but his firm developed a "pitch" chain which solved the issue. Marketed as "Weston Differential Pulley Blocks with Patent Chain Guides", the pulley had good sales, namely, 3000 sets in 9 months.

3. File:Chain hoist.svg - Wikipedia

   en.wikipedia.org/wiki/File:Chain_hoist.svg

   This diagram was created with an unknown SVG tool. ... Principle of operation of a differential pulley or chain hoist, drawn by CMG Lee. Width: 100%: Height: 100%

4. 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.

5. Block and tackle - Wikipedia

   en.wikipedia.org/wiki/Block_and_tackle

   Diagram 3 shows three rope parts supporting the load W, which means the tension in the rope is W/3. Thus, the mechanical advantage is three-to-one. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. This is an example of the Luff tackle.

6. Engine crane - Wikipedia

   en.wikipedia.org/wiki/Engine_crane

   The electric chain hoist, also known as the "electric hoist", is the least used type of engine crane. The operation is similar to the chain hoist in the way that chains are used to lift the engine. The electric chain hoist uses an electric motor operated by remote control to lift the engine, unlike the chain hoist where the operator has to ...

7. Crane (machine) - Wikipedia

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

   Tower cranes are used extensively in construction and other industry to hoist and move materials. There are many types of tower cranes. Although they are different in type, the main parts are the same, as follows: Mast: the main supporting tower of the crane. It is made of steel trussed sections that are connected together during installation.