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  2. Sofa bed - Wikipedia

    en.wikipedia.org/wiki/Sofa_bed

    A couch unfolded into a bed. A sofa bed or sofa-bed (in the US often called a sofabed, hide-a-bed, bed-couch, sleeper-sofa, or pullout sofa) is a multifunctional furniture typically consisting of a sofa or couch that, underneath its seating cushions, hides a metal frame and thin mattress that can be unfolded or opened up to make a bed.

  3. Bed size - Wikipedia

    en.wikipedia.org/wiki/Bed_size

    Adjustable beds or electric adjustable bed sizes differ from the standard bed size. The length of these beds differ from a standard size due to the nature of the bed needing to bend. So they are 200 cm in length rather than 191 cm. King size and super king size are normally two 75 cm or two 90 cm adjacent beds.

  4. Moving sofa problem - Wikipedia

    en.wikipedia.org/wiki/Moving_sofa_problem

    The Hammersley sofa has area 2.2074 but is not the largest solution Gerver's sofa of area 2.2195 with 18 curve sections A telephone handset, a closer match than a sofa to Gerver's shape. A lower bound on the sofa constant can be proven by finding a specific shape of a high area and a path for moving it through the corner.

  5. Bed - Wikipedia

    en.wikipedia.org/wiki/Bed

    A sofabed ("pull-out" or "pull-out bed") is a folding bed that is stored inside a sofa. Sofa beds are also called "convertibles" and "hideaways." A state bed developed in Early Modern Europe from a hieratic canopy of state. A toddler bed is a small bed for young children.

  6. Polyform - Wikipedia

    en.wikipedia.org/wiki/Polyform

    Polyforms can also be considered in higher dimensions. In 3-dimensional space, basic polyhedra can be joined along congruent faces. Joining cubes in this way produces the polycubes, and joining tetrahedrons in this way produces the polytetrahedrons. 2-dimensional polyforms can also be folded out of the plane along their edges, in similar fashion to a net; in the case of polyominoes, this ...

  7. Davenport (sofa) - Wikipedia

    en.wikipedia.org/wiki/Davenport_(sofa)

    In the Tug Hill and Adirondack regions in New York, a davenport may refer primarily to a couch which, like a modern futon lounge, converts on pivoting hinges from a sofa to a bed. [ citation needed ] In other areas of North America, the word davenport is used for a futon -style sofa with storage under the seat area.

  8. Mattress - Wikipedia

    en.wikipedia.org/wiki/Mattress

    Studies suggest that adjustable-firmness beds are better for back pain. [26] Adjustable-firmness mattresses for medical use have special control mechanisms. In the 1990s self-adjusting air beds that automatically change their pressure periodically, or inflate and deflate several air chambers alternately, were introduced.

  9. IKEA Klippan - Wikipedia

    en.wikipedia.org/wiki/IKEA_Klippan

    Adjustments to the materials used in the sofa and the centralization of production methods allowed IKEA to reduce the price of the Klippan sofa by 40% since 1980. [4] In 2003, the Klippan was used as the standard sofa in a test to compare the British fire safety requirements against the Swedish and mainland European safety requirements.