Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Patent
1990-12-17
1992-07-28
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
160170, E06B 930
Patent
active
051333996
ABSTRACT:
An improved blind unit or shade having no pull cord for raising and lowering the blind members of the blind unit. The lower rail is movable upwardly from the lowermost position thereof when an upwardly directed force is applied to cord structure coupled with the blind members and the lower rail. When the lower rail moves progressively upwardly or downwardly with reference to the head rail above the blind members, the lower rail supports a progressively greater or lesser number of blind members. A variable, upwardly directed force is applied to the cord structure with the force being substantially equivalent at all times to the combined weights of the lower rail and the blind members supported on the lower rail when the lower rail is above its lowermost operative position. The force applying means, in one embodiment includes at least one conical member coupled to a constant force spring. In another embodiment, the force applying means includes a variable force leaf spring.
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Hiller Jeffrey H.
Hiller Stephen S.
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