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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. 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)

   Chain – Series of connected links which are typically made of metal; Chain hoist – Device used for lifting or lowering a load; Chain stopper; Come-along – Lever operated, portable ratchet winch; Crane (machine) – Type of machine; Crawler (rigging) Hook – Tool used to grab onto, connect, or attach to something

5. Ratchet (device) - Wikipedia

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

   A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.

6. Come-along - Wikipedia

   en.wikipedia.org/wiki/Come-along

   A similar heavy-duty unit with a combination chain and cable became available in 1935 that was used by railroads, but lacked the success of the cable-only type units. [1] A similar tool to a come-along is a cable puller, which does not have a drum and ratchet but directly grips the cable, allowing unlimited lengths of wire rope to be used.

7. Engine crane - Wikipedia

   en.wikipedia.org/wiki/Engine_crane

   Chain hoists are ceiling-mounted engine cranes that are often slower than hydraulic hoists and electric chain hoists. [4] Chain hoists utilize a system of gears and chains to multiply forces that are produced when the operator is pulling the chain to lift the engine. A braking system prevents the engine from unintentionally lowering by the user ...