Tent – canopy – umbrella – or cane – Umbrella – Self-opening and closing
Patent
1992-03-30
1993-12-07
Friedman, Carl D.
Tent, canopy, umbrella, or cane
Umbrella
Self-opening and closing
135 22, 135 23, 135 251, 135 203, A45B 2514
Patent
active
052675831
ABSTRACT:
An automatic umbrella with multiple folds particularly of triple folds includes: a central shaft device having an upper, a middle, and a lower tubular shaft telescopically engageable with one another and having a grip formed on a lower portion of the central shaft device, a controller formed in the grip for controlling an opening or closing of the umbrella, a rib assembly pivotally secured to the central shaft device for supporting an umbrella cloth on the rib assembly, an extending spring retained within the central shaft device for extending the shaft and the umbrella when opening the umbrella, and a plurality of retraction restoring springs secured on the rib assembly for retracting the rib assembly for closing the umbrella, in which the extending spring is jacketed on an upper sleeve fixed in the upper tubular shaft and jacketed in a middle sleeve secured on the middle tubular shaft of the central shaft device so as to prevent any frictional contacting of the coiled extending spring with an inside wall of the central shaft device for noise prevention and for a smooth opening and closing operation of the umbrella having multiple folds.
REFERENCES:
patent: 1091895 (1914-03-01), Schaaf
patent: 3003508 (1961-10-01), Bremshey
patent: 3672382 (1972-06-01), Sato
patent: 3756258 (1973-09-01), Yoshihara
patent: 4534374 (1985-08-01), Day
patent: 4823821 (1989-04-01), Day
patent: 4936332 (1990-06-01), Wu
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patent: 5060684 (1991-10-01), Wu
patent: 5078165 (1992-01-01), Wu
patent: 5125426 (1992-06-01), Wu et al.
patent: 5144969 (1992-09-01), Chou et al.
patent: 5161562 (1992-10-01), Wu
patent: 5178174 (1993-01-01), Wu
Canfield Robert
Friedman Carl D.
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