Window covering with constant lifting cord friction

Details Window covering with constant lifting cord friction Window covering with constant lifting cord friction

2008-03-07

2010-10-26

Johnson, Blair M. (Department: 3634)

Flexible or portable closure, partition, or panel

Pleating type

With preformed pleats

C160S16810R, C160S17300V, C160S178200

Reexamination Certificate

active

07819166

ABSTRACT:
A window covering includes an at least partially light occluding layer that can be attached to a lintel at an upper end and with a bottom rail at a lower end that can be moved to selectively cover the window. Cords are fixed to the upper end of the layer and extend past the bottom rail. The bottom rail includes a friction module which applies sufficient friction to the cords to keep the bottom rail fixed to the cords unless additional forces are applied to the bottom rail to move the rail. A pair of engagement surfaces are spring biased against the cords to apply friction forces. A lever acts on the springs to adjust for variations in friction forces so that the bottom rail remains horizontal. The bottom rail is formed of a closable structure with a cap hinged to a base for ease in forming the bottom rail.

REFERENCES:
patent: 6443207 (2002-09-01), Cheng et al.
patent: 6845801 (2005-01-01), Hsu
patent: 7198087 (2007-04-01), Hsu
patent: 7373965 (2008-05-01), Cheng
patent: 7562689 (2009-07-01), Militello et al.
patent: 2005/0274466 (2005-12-01), Hsu
patent: 2006/0237144 (2006-10-01), Cheng
patent: 2009/0223642 (2009-09-01), Militello et al.

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