Rib structure of umbrellas
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United States of America Patent
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May 12, 2015
Grant Date -
Nov 29, 2012
app pub date -
Nov 29, 2011
filing date -
Dec 2, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
In order to provide a rib structure of an umbrella, which has superior appearance without receiving unnecessary structural pressure and can contribute to the development of the industry by motivating consumers to buy, this invention features the rib structure of an umbrella which is formed with multiple ribs wherein the length of specific ribs is different from the length of other specific ribs, cloth is stretched onto the above mentioned ribs thereby changing forms of the umbrella and when the above mentioned cloth is put between the above mentioned ribs and adjacent ribs, the cloth does not expand and contract in the direction of the length of said ribs, but is expandable and contractible in any direction with the exception of the direction of the length of said ribs.
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