Wednesday, October 14, 2009

Portable wind turbine for charging batteries

United States Patent 4324985
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Abstract:In a wind turbine assembly incorporating a diffuser, the diffuser includes an articulated duct formed of a set of members, such as the sectors of a conic section, which are pivotable about axes in a plane normal to the turbine axis. To permit an enlargement or contraction of the articulated duct, the members are joined by flexible gussets or, alternatively, are configured for overlapping. Springs offset from the pivoting axes are attached to the members to provide a bistable attitude thereto. In response to high winds, the spring forces are overcome by the wind forces on the articulated duct to allow the members to pivot inwardly reducing the effective wind capture area of the diffuser. The diffuser is further fabricated with slots between sections of duct to enlarge the effective area swept by the turbine blades for increased power availability from the turbine.
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www.inspeed.comUS Patent References:
/0984599.html
Pichault - February, 1911 - 0984599

/1181988.html
Breitung - May, 1916 - 1181988

Windmill
Gentry - August, 1923 - 1465602

Fluid motor
Bonetto - July, 1928 - 1677745

/1876595.html
Beldimano - September, 1932 - 1876595



Inventors:Oman, Richard A. (Huntington, NY)
Application Number:06/167170 Publication Date:04/13/1982 Filing Date:07/09/1980 View Patent Images:Download PDF 4324985 PDF help Export Citation:Click for automatic bibliography generation Assignee:Grumman Aerospace Corp. (Bethpage, NY)
Primary Class:290/55 Other Classes:440/8, 415/4.300, 415/151 International Classes:F03D1/04; F03D7/02; F03D1/00; F03D7/00; F03D7/04; F03D1/04 Field of Search:415/2A, 415/3A, 415/4A, 440/8, 440/37, 60/694, 60/695, 290/55 US Patent References:2018888 Windmill October, 1935 Francis 415/2
2055012 Wind electric plant September, 1936 Jacobs 290/55
3447741 FAIRED PROPELLER WITH DIFFUSER June, 1969 Havette et al. 49/291
3883750 Method and apparatus for generating power from wind currents May, 1975 Uzzell 290/55
4021135 Wind turbine May, 1977 Pedersen et al. 72/470
4073516 Wind driven power plant February, 1978 Kling 290/55
4075500 Variable

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