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  2. Box-spring - Wikipedia

    en.wikipedia.org/wiki/Box-spring

    Standard "high profile" box springs are 9 inches (23 cm) in height, whereas "low profile" box springs are between 5 and 5.5 inches (13 and 14 cm). Changing the thickness of the box spring and mattress requires revisions to the mattress and box spring coil stiffness. This is often why box springs and mattresses are matched and sold in pairs.

  3. List of disk drive form factors - Wikipedia

    en.wikipedia.org/wiki/List_of_disk_drive_form...

    8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the length of platters and read-write heads A newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD. IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators.

  4. Bed base - Wikipedia

    en.wikipedia.org/wiki/Bed_base

    This foundation, variously called a "no-flex", "low-flex" or zero-deflection unit, as well as an "ortho box", provides support similar to a platform foundation. [ clarification needed ] All-wood slat foundations, initially rare in the U.S., have become increasingly prevalent as U.S. mattress makers shifted to super-thick, one-sided mattresses ...

  5. Mattress - Wikipedia

    en.wikipedia.org/wiki/Mattress

    Two-sided, innerspring pillow-top mattress on box-spring foundation with a woven damask cover also called a mattress sheet. A mattress is a large, usually rectangular pad for supporting a person lying down, especially for sleeping. It is designed to be used as a bed, or on a bed frame as part of a bed.

  6. Belleville washer - Wikipedia

    en.wikipedia.org/wiki/Belleville_washer

    The load applied to the reduced-thickness spring to obtain a deflection equal to the 75% of the free height (of an unreduced spring) must be the same as for an unreduced spring. As the overall height is not reduced, springs with reduced thickness inevitably have an increased flank angle and a greater cone height than springs of the same nominal ...

  7. Mattress coil - Wikipedia

    en.wikipedia.org/wiki/Mattress_coil

    Marshall coils, also known as wrapped or encased coils or pocket springs, are thin-gauge, barrel-shaped, knotless coils individually encased in fabric pockets—normally a fabric from man-made, non-woven fiber. Some manufacturers pre-compress these coils, which makes the mattress firmer and allows for motion separation between the sides of the bed.