Tent – canopy – umbrella – or cane – Umbrella – Self-opening and closing
Patent
1975-07-21
1977-07-12
Schroeder, Werner H.
Tent, canopy, umbrella, or cane
Umbrella
Self-opening and closing
135 3E, 135 14D, 135 15CF, 135DIG1, A45F 112, A45F 116
Patent
active
040347729
ABSTRACT:
A vaulted membrane shelter comprising a multiplicity of vertical arches with curved bights, spaced apart, mounted on a base forming a frame that supports a flexible highly tensioned roof membrane operatively attached to the arches and curved concavely inward between them sufficiently to enhance its live roof load carrying capacity, to oppose arch deflection thereby increasing stability and to form a roof of double curvature to prevent membrane vibration and flutter. The membrane being tensioned longitudinally by arch separation movement which, in turn, tensions it transversely by slightly decreasing its inward curvature. Sufficient inward membrane curvature controls arch deflection within the elastic limits of membrane, similar to the way bicycle wheel spokes control deflection of the rim.
REFERENCES:
patent: 2225972 (1940-12-01), Brogren
patent: 2797696 (1957-07-01), Fritsche
patent: 2802478 (1957-08-01), Fritsche
patent: 2806477 (1957-09-01), Fritsche
patent: 2986150 (1961-05-01), Torian
patent: 3240217 (1966-03-01), Bird et al.
patent: 3496686 (1970-02-01), Bird
patent: 3534750 (1970-10-01), Kolozsvary
patent: 3563257 (1971-02-01), Cummins
patent: 3811454 (1974-05-01), Huddle
patent: 3961638 (1976-06-01), Huddle
Berman Conrad L.
Schroeder Werner H.
Tension Structures Co.
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