Cordless window blind structure

Details Cordless window blind structure Cordless window blind structure

2011-07-26

2011-07-26

Johnson, Blair M. (Department: 3634)

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

C160S17810R, C160S084040

Reexamination Certificate

active

07984745

ABSTRACT:
A cordless window blind structure is provided. A movable seat having a pulley block and a cord-winding assembly is disposed within a head rail of the cordless blind. The pulley block is connected to a lift cord wound through a first positioning element, so as to control the opening and closing of a blind body. And the cord-winding assembly has a cord winder attached to one end of a retrieving cord and a torsion spring. The other end of the retrieving cord is fastened either on the head rail, the movable seat, a second positioning element, or an end cap. The structure of the second positioning element is resembled to the first positioning element. By taking one end of the retrieving cord as a pivot, the movable seat moves laterally therealong the head rail by a restoring force generated through the torsion spring.

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patent: 5477904 (1995-12-01), Yang
patent: 7398815 (2008-07-01), Liang
patent: 7487817 (2009-02-01), Liang
patent: 2006/0137830 (2006-06-01), Lin
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patent: 2007/0272364 (2007-11-01), Liang
patent: 2007/0284060 (2007-12-01), Liang
patent: 2008/0289774 (2008-11-01), Ying
patent: 2009/0159219 (2009-06-01), Wen et al.

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