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قديم 10-31-2013, 06:45 PM
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15- الإطارات الهوائية جان دنلوب إنجليزي 1888م

- مجهول الطفولة ولا يعرف عنه شيء سوى انه ولد في عائلة فلاحين.

جون بويد دنلوب

(بالإنجليزية: John Boyd Dunlop) (ولد 23 أكتوبر 1921 توفي 5 فبراير 1840) كان مخترع اسكتلندي. وكان واحدا من مؤسسي شركة دنلوب للإطارات المطاطية التي تحمل اسمه.
في عام 1887، طور أول إطار بتكنولوجيا الغازات المنضغطة لدراجة ثلاثية العجلات لابنه، اختبرها، وحصل على براءة اختراع في 7 ديسمبر 1888.
صورة دنلوب تظهر اليوم على ورقة عملة 10 جنيه استرليني التي يصدرها البنك الشمالي والتي هي قيد التداول في أيرلندا الشمالية.[1]
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Dunlop the reputed inventor of the pneumatic tyre was born in 1840 to a farming family in Dreghorn. Dreghorn was a mining village situated in North Ayrshire, it lies just a few miles east of the royal burgh of Irvine. Contrary to popular belief, Dunlop did not invent the pneumatic tyre, it was actually invented by Robert William Thomson, another Scot


John B. Dunlop was born in Aryshire, Scotland. After completing his schooling, Dunlop practiced as a veterinary surgeon first in Edinburgh, Scotland, andthen in Belfast, Ireland. In 1887 Dunlop was asked by his young son to thinkof some way to make the boy's tricycle ride more comfortably on Belfast's cobblestone streets. Dunlop began experimenting with improvements to the tricycle's solid rubber tires. He cut up an old garden hose, made it into a tube, pumped it up with air, and fitted it to the rear wheels of his son's tricycle.Dunlop had reinvented the pneumatic tire, which, unknown to Dunlop, had firstbeen invented by Robert Thomson in 1845.



Dunlop tested and patented his pneumatic tire in Great Britain in 1888, and secured a U.S. patent in 1890. An Irish industrialist named W. H. Du Cros became interested in Dunlop's invention after a cyclist won a Belfast race with his pneumatic-tired bicycle. Du Cros organized a company with Dunlop, which became the Dunlop Rubber Company, eventually a worldwide concern.



Dunlop did not profit greatly from his invention. He sold his patent and interest in the company to Du Cros in 1896 and retired to Dublin, where his onlybusiness activity until his death there in 1921 was an interest in a draperyfirm.



After its introduction in 1888, Dunlop's pneumatic tires became standard equipment for bicycles since they so well absorbed the direct road shock that bicyclists experienced. The same year as Dunlop's patent, the first automobile was produced by Karl Benz of Mannheim, Germany. The availability of Dunlop's new tires led to experiments by others to produce a thicker-tread tire for motor vehicles, and in 1895 Michelin's first automobile tire appeared. With thegrowing popularity of the automobile after 1900, the demand for increasinglydurable rubber compounds for both bicycles and autos became enormous. Dunlop's invention gave rise to two major industries.

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