Super-shortened multiple-fold umbrella
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United States of America Patent
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Issued Date -
Jul 13, 2006
app pub date -
Jan 7, 2005
filing date -
Jan 7, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A multiple-fold umbrella includes a telescopic central shaft having seven tubes telescopically coupled with one another, with an outermost tube having no (or zero) concave portion formed on the outermost tube, and with an innermost tube having six concave portions circumferentially formed on the innermost tube, each concave portion recessed in the tube centripetally about a longitudinal axis of the shaft and defining a central angle of sixty degrees, and the tubes gradationally increasing the number of the concave portions from the outermost tube towards the innermost tube to define an air chamber between a concave portion of an inner tube and a circular periphery of an outer tube neighboring to the inner tube for a smooth slidable coupling of every two neighboring tubes.
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