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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. M123 and M125 10-ton 6x6 trucks - Wikipedia

   en.wikipedia.org/wiki/M123_and_M125_10-ton_6x6...

   In 1949 the US Army set a requirement for a family of extra heavy-duty 10‑ton (9,072 kg) load rated, off-road, 6x6 tactical trucks. Mack's design, influenced by their WWII era NO (7 + 1 ⁄ 2-ton, 6x6 truck), was chosen. Designed as an entire family of trucks, only the semi-tractor and cargo/prime mover were built. 392 M123 were built between ...

5. 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 ...

6. Dump truck - Wikipedia

   en.wikipedia.org/wiki/Dump_truck

   The bed is raised by a vertical hydraulic ram mounted under the front of the body (known as a front post hoist configuration), or a horizontal hydraulic ram and lever arrangement between the frame rails (known as an underbody hoist configuration), and the back of the bed is hinged at the back of the truck.

7. Gantry crane - Wikipedia

   en.wikipedia.org/wiki/Gantry_crane

   Some portable gantry cranes are equipped with an enclosed track, while others use an I-beam, or other extruded shapes, for the running surface. Most workstation gantry cranes are intended to be stationary when loaded, and mobile when unloaded. Workstation Gantry Cranes can be outfitted with either a wire rope hoist or a lower capacity chain hoist.