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  2. Hardpan - Wikipedia

    en.wikipedia.org/wiki/Hardpan

    In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water. Some hardpans are formed by deposits in the soil that fuse ...

  3. Motorized wheelchair - Wikipedia

    en.wikipedia.org/wiki/Motorized_wheelchair

    This can take one of three forms: integrated with the hub of hand-propelled wheels, so that any force on the pushrims is magnified by the drive system, or mounted under the wheelchair and controlled as for a powerchair, but with the motive force either transmitted to the main wheels via a friction drive system, or delivered directly through an ...

  4. Invalid carriage - Wikipedia

    en.wikipedia.org/wiki/Invalid_carriage

    Fritz Fend, a former technical officer with the Luftwaffe, also designed a three-wheel invalid carriage in 1948. The first version was unpowered, with the single wheel situated at the front. His powered version had a 38cc Victoria two-stroke engine, with a chain-driven single rear wheel; the two wheels at the front were used for steering. This ...

  5. Mecanum wheel - Wikipedia

    en.wikipedia.org/wiki/Mecanum_wheel

    A Mecanum wheel is an omnidirectional wheel design for a land-based vehicle to move in any direction. It is sometimes called the Swedish wheel or Ilon wheel after its inventor, Bengt Erland Ilon (1923–2008), [ 1 ] who conceived of the concept while working as an engineer with the Swedish company Mecanum AB, and patented it in the United ...

  6. Why are shopping carts always broken? - AOL

    www.aol.com/why-shopping-carts-always-broken...

    In a perfect world where carts were handled gently and utilized only indoors, the standard five-inch polyurethane shopping cart wheel could last between six and eight years, said Alvar Diaz, vice ...

  7. Crank (mechanism) - Wikipedia

    en.wikipedia.org/wiki/Crank_(mechanism)

    The 82.5 cm (32 inches) long piece has fitted to one end a 15 cm (6 inches) long bronze handle, the other handle being lost. [ 32 ] [ 31 ] An true iron crank about 40 cm (16 inches) long was excavated, along with a pair of shattered mill-stones of 50 to 65 cm (20 to 26 inches) diameter and diverse iron items, in Aschheim , close to Munich .

  8. Heywood-Wakefield Company - Wikipedia

    en.wikipedia.org/wiki/Heywood-Wakefield_Company

    The merged entity stayed abreast of wicker furniture trends by hiring designers such as Paul Frankl and Donald Deskey during the 1920s. [7] The 1920s saw the company move into installing seating in movie palaces. [9] Its furniture was exhibited at the 1933 Century of Progress exhibition and at the 1964 New York World's Fair. [10]

  9. Morris chair - Wikipedia

    en.wikipedia.org/wiki/Morris_chair

    Morris chairs feature a seat with a reclining back and moderately high armrests, which give the chair an old-style appearance. The characteristic feature of a Morris chair is a hinged back, set between two un-upholstered arms, with the reclining angle adjusted through a row of pegs, holes or notches in each arm.