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Between 1905 and 1947, Coopersmith filed over 30 patents for mechanical parts of sofa beds, mattresses, and mattress manufacturing machinery. In 1925, he took out a patent for the sofa bed, the precursor of the modern-day pullout sofa. William Lawrence Murphy took out a patent for making "In-A-Dor bed", which is known as a "Murphy bed" today ...
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.
Size Dimensions Notes Inches Centimeters Half Queen or Split Queen 30 × 79.5 76 × 202 For adjustable Queen size beds where each half moves independently. Half California King or Split California King 36 × 83.5 91 × 212 For adjustable California King size beds where each half moves independently. Short Queen or RV Queen 60 × 75 152 × 191
The area thus obtained is referred to as the sofa constant. The exact value of the sofa constant is an open problem. The leading solution, by Joseph L. Gerver, has a value of approximately 2.2195. In November 2024, Jineon Baek posted an arXiv preprint claiming that Gerver's value is optimal, which if true, would solve the moving sofa problem. [2]
To conserve space, some sofas double as beds in the form of sofa beds, daybeds, or futons. A Kubus sofa by Josef Hoffmann (1910) A furniture set consisting of a sofa with two matching chairs [17] is known as a "chesterfield suite" [18] or "living-room suite". [19] In the UK, the word chesterfield was used to refer to any couch in the 1900s. A ...
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