Automatic umbrella having wind-resistant buffer effect
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United States of America Patent
Stats
-
Aug 3, 1993
Grant Date -
N/A
app pub date -
Sep 21, 1992
filing date -
Sep 21, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic umbrella includes: a central shaft, a plurality of ribs secured with an umbrella cloth and pivotally secured to the central shaft, an umbrella-opening spring, an umbrella-closing spring, and a control device having a resilient retainer slidably held within an elongate slot formed in the central shaft, whereby upon an acting of a wind pressure on the umbrella cloth to lower the umbrella ribs and the resilient retainer, the elongate slot formed in the central shaft provides a buffer for allowing a downward movement of the resilient retainer and a folding of the umbrella ribs to temporarily reduce a wind-catching area of the umbrella cloth to decrease a total wind force acting on the umbrella for a lighter holding of the umbrella especially under a strong wind.
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