Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Patent
1989-09-21
1990-04-17
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
160177, 464 40, E06B 926
Patent
active
049171682
ABSTRACT:
A venetian blind includes a superposed series of horizontal slats suspended one above another, a bottom rail disposed below the slats, and two angle-controlling devices disposed at two end portions of the series of slats. Each of the angle-controlling devices includes a rotatable pulley disposed above the slats and provided with an annular groove, two tilting cords respectively connected to two sides of each of the slats, and a coiled spring sleeved tightly on the pulley within the annular groove which has two ends to which the top ends of the tilting cords are respectively fastened. The bottom rail is attached to the bottom ends of the tilting cords. When the pulleys are rotated to a predetermined position, one end of each of the springs is moved radially outward due to the downward pull of the bottom rail, so that the springs are loosened from the pulleys.
REFERENCES:
patent: 3156295 (1964-11-01), Vecchiarelli et al.
patent: 3180400 (1965-04-01), Rau
patent: 3893554 (1975-07-01), Wason
patent: 4200135 (1980-04-01), Hennequin
patent: 4676292 (1987-06-01), Valle et al.
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