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Herbert Everest was also physically disabled after surviving a mining accident in 1918. Everest complained to Jennings about the bulk of chairs available in the early 1930s, and in 1933, the pair designed and built a lightweight, collapsible model in Jennings' garage. [3] [1] The design was patented in October 1937. [4]
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Where an ultra-lightweight manual chair may weigh under 10 kg, the largest outdoor power-chairs may weigh 200 kg or more. Smaller power chairs often have four wheels, with front or rear wheel drive, but large outdoor designs commonly have six wheels, with small wheels at front and rear and somewhat larger powered wheels in the centre.
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Ultralight materials are solids with a density of less than 10 mg/cm 3, including silica aerogels, carbon nanotube aerogels, aerographite, metallic foams, polymeric foams, and metallic microlattices. The density of air is about 1.275 mg/cm 3 , which means that the air in the pores contributes significantly to the density of these materials in ...