The primary function of extension springs, also known as tension springs, is to allow an outside force to create “tension”, then use energy to pull components back together. Conversely, Compression Springs are designed to keep components apart. To simplify it a bit, compression springs are those coiled things that you may see in a broken chair or torn mattress.
Extension springs can be used in a wide range of industries, including rail, agriculture, oil, and gas. Extension springs are also popular in the medical industry and are used in stretchers and surgical lights.
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