Static structures (e.g. – buildings) – Barrier or major section mounted for in situ repositioning;...
Patent
1991-06-03
1994-02-08
Friedman, Carl D.
Static structures (e.g., buildings)
Barrier or major section mounted for in situ repositioning;...
135102, 135109, 135117, 160 581, 49324, E04B 1346
Patent
active
052839931
ABSTRACT:
A door system for a stressed fabric structure comprising a stationary arched anchor beam, the ends of which are supported on the base at one end of the structure, a plurality of movable arched beams of similar size and shape on the side of the anchor beam away from the structure and having supporting ends pivotally secured at the ends of the anchor beam, the movable beams to pivot along the same radial path about common pivot points at the ends, between raised, open position adjacent to the anchor beam and closed position in which the beams are spaced progressively from the anchor beam to the structure base. Fabric panels are secured to and extend between each of the anchor beam and its adjacent movable beam and adjacent pairs of movable beams so as to be under similar tension when the beams are in closed position. Hydraulic pistons or other mechanical arrangements are provided simultaneously to move the movable beams to open or closed positions and maintain them as required in said open or closed positions or positions intermediate thereto.
REFERENCES:
patent: 1257535 (1918-02-01), Sampson
patent: 2806477 (1957-09-01), Fritsche
patent: 3161231 (1964-12-01), Dawson et al.
patent: 3820553 (1974-06-01), Huddle
patent: 4886083 (1989-12-01), Gamache
patent: 5121765 (1992-06-01), MacMorris, Jr.
Friedman Carl D.
Hand Francis C.
Mai Lan M.
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