In stage performances, when a safety stage light manual hoist is required to frequently lift audio equipment weighing around 50 kilograms, each time the chain is stressed and stretched, the "chain shoulder" part can, by virtue of its uniform curvature, smoothly transmit the pulling force from the heavy object to the entire chain link, enabling all parts of the chain to share the load together. This is like multiple people lifting a heavy object together, where each person bears a relatively balanced amount of force, which can effectively reduce the fatigue damage to local metals caused by repeatedly bearing excessive stress. Conversely, if the curvature of the "chain shoulder" is uneven, a small section may bear stress far exceeding its bearing capacity, just like a person bearing a weight far beyond their own limit alone, which can easily "break down" due to overwork.
To put it more vividly, such uniform curvature allows the transmission of stress in the chain to be like a smooth river, where the water flow (stress) flows naturally along the river channel (chain shoulder arc), steady and orderly; while the stress concentration points formed by sudden changes in curvature are like reefs in the river channel. When the water flow hits the reefs, it will huge waves (stress peaks). Long-term impact will continuously erode the river channel (metal material), and eventually lead to the collapse of the river channel (chain breakage). It is precisely this meticulous attention to the processing technology of the "chain shoulder" that provides a solid guarantee for the safe and reliable operation of the safety stage light manual hoist, enabling it to maintain stable performance in frequent stage operations.
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