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For example, on loose or uneven ground oversize wheels are a great advantage; solid or puncture-proof foam filled tires may be used where punctures could deflate pneumatic tires. A rule of thumb is that the toe or nose of the truck should be at least one-third of the length of the load. Hand trucks are sometimes used as baggage carts by porters ...
The first idea for rubber-tyred railway vehicles was the work of Scotsman Robert William Thomson, the original inventor of the pneumatic tyre.In his patent of 1846 [2] he describes his 'Aerial Wheels' as being equally suitable for, "the ground or rail or track on which they run". [3]
Firestone Tire and Rubber Company is an American tire company founded by Harvey S. Firestone (1868–1938) in 1900 initially to supply solid rubber side-wire tires [2] for fire apparatus, [3] and later, pneumatic tires for wagons, buggies, and other forms of wheeled transportation common in the era.
Pneumatic tires also have a much lower rolling resistance than solid tires. Because the internal air pressure acts in all directions, a pneumatic tire is able to "absorb" bumps in the road as it rolls over them without experiencing a reaction force opposite to the direction of travel, as is the case with a solid (or foam-filled) tire. [26]
The wheel was barely used for transportation, with the exception of Ethiopia and Somalia in Sub-Saharan Africa well into the 19th century. [45] [44] Three spoked wheels on an antique tricycle. The spoked wheel was in continued use without major modification until the 1870s, when wire-spoked wheels and pneumatic tires were invented. [46]
Wheels and tires Wheel type - disc; Tire type - pneumatic, chamber; Tire size - 425/85 R21 (1260x425-533P) Platform Platform onboard, with metal folding sides; Internal dimensions, mm - 6100x2320; Board height, mm - 500; General characteristics Maximum speed, km/h - 90; Angle overcome. lifting, % not less than — 60 (31º)
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