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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.
ASME HST-5 - Performance Standard for Air Chain Hoists; ASME HST-6 - Performance Standard for Air Wire Rope Hoists; ANSI Z535.4 - Product Safety Signs and Labels; NFPA 70 - National Electric Code; AISC - AISC manual of Steel Construction: Load and Resistance Factor Design; AISC - AISC manual of Steel Construction: Allowable Stress Design
A rigger or slinger is a skilled tradesperson who specializes in the assistance of manual mechanical advantage device comprising pulley, block and tackle or motorised such as a crane or derrick or chain hoists (chain fall) or capstan winch.
Manual crane from the late 19th century used for unloading small loads from ships at the Port of Barcelona, Spain A crane is a machine used to move materials both vertically and horizontally, utilizing a system of a boom , hoist , wire ropes or chains , and sheaves for lifting and relocating heavy objects within the swing of its boom.
SHANGHAI/BERLIN (Reuters) -Mercedes-Benz is betting on China's Momenta to help it win back market share in the world's biggest auto market, with plans for fresh investment and at least four future ...
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