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2. Mattress coil - Wikipedia

   en.wikipedia.org/wiki/Mattress_coil

   Mattress coils, also known as mattress springs, are coil springs used in a mattress. Coils are primarily used in the core (support layer) of innerspring mattresses , which is their original use. In recent years, small "micro-coils" are being used in the upholstery (comfort layer) of mattresses, primarily with a coil core ("coil-on-coil ...

3. Coil spring - Wikipedia

   en.wikipedia.org/wiki/Coil_spring

   Metal coil springs are made by winding a wire around a shaped former – a cylinder is used to form cylindrical coil springs. Illustration of various arc springs and arc spring systems (systems consisting of inner and outer arc springs). Coil springs for vehicles are typically made of hardened steel. A machine called an auto-coiler takes spring ...

4. Marshall coil - Wikipedia

   en.wikipedia.org/wiki/Marshall_coil

   Marshall produced pre-compressed cylindrical coil springs, each sewn inside an individual cotton fabric pocket, which provided uplifting support on its own. When fitted together, the coils became an independent suspension system that contoured to each person's form and weight, providing unsurpassed support and comfort.

5. Upholstery coil springs - Wikipedia

   en.wikipedia.org/wiki/Upholstery_Coil_Springs

   Upholstery spring. Upholstery coil springs are an important part of most modern upholstery.The consumer usually never sees the construction features of an upholstered piece. . The overall quality of the materials and construction dictate the comfort level of an upholstered piece and its ability to satisfy the consumer over the long t

6. End-face mechanical seal - Wikipedia

   en.wikipedia.org/wiki/End-face_mechanical_seal

   Many different types of springs are used, including: relatively large single coil springs, multiple sets of small coil springs, and wave springs. A formed or welded metal bellows can also act as the spring. Corrosion, clogging and movement are major considerations when selecting a spring design.

7. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   Helical coil springs designed for tension A heavy-duty coil spring designed for compression and tension The English longbow – a simple but very powerful spring made of yew, measuring 2 m (6 ft 7 in) long, with a 470 N (105 lbf) draw weight, with each limb functionally a cantilever spring. Force (F) vs extension (s).