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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.
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.
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%
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.
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.
An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the ...
When they retired, the Leedys lived in Alexandria, Virginia, an affluent, high-cost Washington, D.C., suburb. “My mother was 92, and we knew we had to have her live with us, as she could not ...
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 ...
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