Super-shortened multiple-fold umbrella shaft
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United States of America Patent
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Issued Date -
Oct 6, 2005
app pub date -
Mar 31, 2004
filing date -
Mar 31, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A multiple-fold umbrella shaft includes: a plurality of tubes gradually increasing diameter from the innermost tube to the outermost tube, and telescopically engageable with one another about a longitudinal axis of the shaft; each tube having a plurality of reinforcing ribs longitudinally formed, evenly distributed and radially recessed in a cylindrical tubular surface of each tube, with any two neighboring reinforcing ribs defining a central angle about the longitudinal axis of the shaft, which is equal to any other central angle defined between any other two neighboring reinforcing ribs; whereby upon assembling of the plurality of tubes to form a multiple-fold umbrella shaft, an inner tube has its plural reinforcing ribs slidably engageable with plural reinforcing ribs of an outer tube disposed about the inner tube for preventing from twisting, vibration, deformation or damage of the umbrella shaft.
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