Tent – canopy – umbrella – or cane – Umbrella – Self-opening and closing
Patent
1974-06-21
1976-05-25
Murtagh, John E.
Tent, canopy, umbrella, or cane
Umbrella
Self-opening and closing
E04B 1347, A45F 116
Patent
active
039585883
ABSTRACT:
A tent-like structure, hereafter called a pavilion with a series of curved arches and a panel of flexible membranous material attached to each pair of arches and tensioned in both directions with the panels concavely curved in the direction of the spacing of the arches as well as convexly curved in the other direction to minimize flutter and vibration and to enhance its load-carrying capacity. The panels are attached to the arches by inserting beads on their edges into tunnels in the arches so that the panels may slide lengthwise of the arches to tension them lengthwise. The arches are mounted on rails to swing from recumbent to upright positions and to slide toward each other, to to facilitate assembly of (attach) the panels to the arches, and away from each other, to tension the panels transversely. To move the arches apart and tension the panels transversely, extensible struts, such as toggles or jack-screws, are provided between (each pair of) the arches. Alternate arches may be made larger or smaller than the other arches to enable inside struts to be used without interference with the panels. End closures, of the same general construction as the body of the shelter which may close the ends of the shelter or nest with the body of the shelter to open the ends, may also be provided. The concave transverse curvature may be imparted to the panels in the manner disclosed in the applicant's application, Ser. No. 93293, filed Nov. 17, 1971, or by preforming the panels with such curvature.
REFERENCES:
patent: 2802478 (1957-08-01), Fritsche
patent: 2828756 (1958-04-01), Worley
patent: 3215153 (1965-11-01), Huddle
patent: 3424179 (1969-01-01), Minot
patent: 3496686 (1970-02-01), Bird
patent: 3535834 (1970-10-01), Nichols
Murtagh John E.
Tension Structures Co.
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