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2. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   The difference in radii can be made very small, making the mechanical advantage of this pulley system very large. [ 4 ] [ 5 ] In the extreme case of zero difference in radii, MA becomes infinite, thus no force (besides friction) is needed to move the chain, but moving the chain will no longer lift the load.

3. Hydraulic hooklift hoist - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_hooklift_hoist

   Such systems operate between 4,000 to 5,800 psi (28,000 to 40,000 kPa). The North American market developed low pressure / high volume systems, which allowed operators to share the hoist's hydraulic system with other hydraulically powered devices. These systems typically operate with a larger gear pump and larger hydraulic reservoir. Operating ...

4. 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 ...

5. 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.

6. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Louden Machinery Company - Wikipedia

   en.wikipedia.org/wiki/Louden_Machinery_Company

   The company continued to expand its product line in the 1920s and 1930s, adding a wide array of products, including barn cupolas, exhaust and intake hoods and louvers, fans, valves, pulleys, power hoists, concrete mangers, a patented garage door hanger (using overhead door tracks for ease in opening and closing), playground equipment (including ...