Tent – canopy – umbrella – or cane – Umbrella – Nonsymmetrical – axially offset – or inclined canopy
Patent
1993-06-16
1994-10-18
Friedman, Carl D.
Tent, canopy, umbrella, or cane
Umbrella
Nonsymmetrical, axially offset, or inclined canopy
135 203, 135 22, A45B 1100
Patent
active
053559029
ABSTRACT:
An umbrella comprises a collapsible cover portion and a flexible loop member attached to the cover portion. A linkage mechanism attached to the flexible loop member at first, second and third equidistantly spaced points moves the first, second and third points together such that the loop member is folded onto itself to form a plurality of smaller overlapping loops when the umbrella is in a closed position, and moves the first, second and third points away from each other such that the overlapping loops expand when the umbrella is in an opened position.
REFERENCES:
patent: 2605778 (1952-08-01), Clapper
patent: 4312371 (1982-01-01), Koon
patent: 4347862 (1982-09-01), Secon
patent: 4360035 (1982-11-01), Dillman
patent: 4658843 (1987-04-01), Raymond
patent: 4815784 (1989-03-01), Zheng
C. H. Chiang, "Kinematics of Spherical Mechanism", pp. 248-251 and 350-352, Cambridge University Press 1988.
Thesis by Karen S. Schlangen, "Spherical Mechanisms: Conception Through Construction", pp. 1-50.
"Spherical trigonometry", Kinematics of Spherical Mechanisms by C. H. Chiang, Published by Cambridge University Press in 1988, pp. 350-352.
"Dimensional syntheses--function generation problems", Kinematics of Spherical Mechanism by C. H. Chiang, Published by Cambridge University Press in 1988, pp. 248-251.
Friedman Carl D.
Regents of the University of Minnesota
Wood Wynn E.
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