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121 замкнутый цикл
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122 Koepe, Friedrich
SUBJECT AREA: Mining and extraction technology[br]b. 1 July 1835 Bergkamen, Westphalia, Germanyd. 12 September 1922 Bochum, Germany[br]German mining engineer, inventor of the friction winder for shaft hoisting.[br]After attending the School of Mines at Bochum, from 1862 he worked as an overseer in the coal-mining district of Ibbenbüren until he joined a mining company in the Ruhr area. There, as head of the machine shop, he was mainly concerned with sinking new shafts. In 1873 he became the Technical Director of the Hannover mine, near Bochum, which belonged to Krupp. When the shaft hoisting was to be extended to a lower level Koepe conceived the idea of applying a friction winder to the hoist instead of a drum, in order to save weight and costs. His method involved the use of an endless rope to which the cages were fixed without a safety catch. The rope passed over pulleys instead of coiling and uncoiling on a drum, and he consequently proposed to have the motor erected on top of the shaft rather than beside it, as had been the practice until then.Koepe's innovation turned out to be highly effective for hoisting heavy loads from deep shafts and was still popular in many countries in the 1990s, although the Krupp company did not accept it for a long time. He had severe personal problems with the company, and as Krupp refused to have his system patented he had to take it out in his own name in 1877. However, Krupp did not pay for the extension of the patent, nor did they pass the dossiers over to him, so the patent expired two years later. It was not until 1888 that a hoisting engine equipped with a friction winder was erected for the first time in a head gear, above the new Hannover II shaft. The following year Koepe left the Krupp company and settled as a freelance consulting engineer in Bochum; he was successful in having his system introduced by other mining companies. Ironi-cally, in 1948 the world's first four-rope winding, based on his system, was installed at the Hannover mine.[br]Further ReadingFor detailed biographical information and an assessment of his technological achievements see: H.Arnold and W.Kroker, 1977, "100 Jahre Schachtförderung nach dem System Koepe", Der Anschnitt 29:235–42.F.Lange, 1952, Die Vierseilförderung, Essen.WK -
123 Sickels, Frederick Ellsworth
[br]b. 20 September 1819 Gloucester County, New Jersey, USAd. 8 March 1895 Kansas City, Missouri, USA[br]American inventor of a steam-inlet cut-off valve mechanism for engines and steam steering apparatus for ships.[br]Sickels was educated in New York City, where his father was a practising physician. As he showed mechanical aptitude, at the age of 16 he joined the Harlem Railroad as a rod man, and a year later became a machinist in the Allaire Works in New York, studying physics and mechanics in his spare time. He perfected his cut-off mechanism for drop valves in 1841 and patented it the following year. The liberating mechanism allowed the valve to fall quickly onto its seat and so eliminated "wire-drawing" of the steam, and Sickels arranged a dashpot to prevent the valve hitting the seat violently. Through further improvements patented in 1843 and 1845, he gained a considerable fortune, but he subsequently lost it through fighting patent infringements because his valve gear was copied extensively.In 1846 he turned his attention to using a steam engine to assist the steering in ships. He filed a patent application in 1849 and completed a machine in 1854, but he could not find any ship owner willing to try it until 1858, when it was fitted to the August. A patent was granted in 1860, but as no American ship owners showed interest Sickels went to England, where he obtained three British patents; once again, however, he found no interest. He returned to the United States in 1867 and continued his fruitless efforts until he was financially ruined. He patented improved compound engines in 1875 and also contributed improvements in sinking pneumatic piles. He turned to civil engineering and engaged in railway and bridge construction in the west. In about 1890 he was made Consulting Engineer to the National Water Works Company of New York and in 1891 became Chief Engineer of its operations at Kansas City.[br]Further ReadingDictionary of American Biography, 1935, Vol. XVII, New York: C.Scribner's Sons. C.T.Porter, 1908, Engineering Reminiscences, reprinted 1985, Bradley, Ill.: Lindsay Publications (comments on his cut-off valve gear).H.G.Conway, 1955–6, "Some notes on the origins of mechanical servo systems", Transactions of the Newcomen Society 29 (comments on his steam steering apparatus).RLHBiographical history of technology > Sickels, Frederick Ellsworth
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