Tent – canopy – umbrella – or cane – Umbrella – Self-opening and closing
Patent
1992-09-21
1993-08-03
Chilcot, Jr., Richard E.
Tent, canopy, umbrella, or cane
Umbrella
Self-opening and closing
135 2533, 135 2541, 135 28, 135 38, A45B 2514
Patent
active
052320049
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.
REFERENCES:
patent: 3074419 (1963-01-01), Foltis et al.
patent: 3625236 (1971-12-01), Hayano
patent: 3729012 (1973-04-01), Weber
patent: 3746025 (1973-07-01), Murata
patent: 3828805 (1974-08-01), Thur
patent: 4548222 (1985-10-01), Day
patent: 4860776 (1989-08-01), McQuain
patent: 4989625 (1991-02-01), Wu
patent: 5125426 (1992-06-01), Wu et al.
patent: 5144969 (1992-09-01), Chou et al.
Chilcot Jr. Richard E.
Mai Lan M.
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