Center of gravity adjustable bottom rail for window blind...

Details Center of gravity adjustable bottom rail for window blind... Center of gravity adjustable bottom rail for window blind...

2003-05-20

2004-07-06

Purol, David (Department: 3634)

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

C160S17810R

Reexamination Certificate

active

06758258

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to lifting window blinds (roll-up blinds, Venetian blinds) and, more specifically, to a center of gravity adjustable bottom rail for window blind. The invention relates to also to a window blind assembly having a center of gravity adjustable bottom rail.
2. Description of the Related Art
FIG. 7
shows a roller blind
90
according to the prior art. This structure of roller blind
90
comprises a barrel
91
fastened pivotally with the top of a window (not shown) in transverse direction, a bottom rail
92
arranged in parallel to and spaced below the barrel
91
, flexible slats
93
arranged in parallel between the barrel
91
and the bottom rail
91
, two thin covering sheets
95
respectively covering the slats
93
at front and back sides and connected between the barrel
91
and the bottom rail
92
to join the slats
93
. The covering sheets
95
soften the light passing through the window blind assembly
90
. The user can rotate the barrel
91
(manually or by a motor drive) to roll up the slats
93
and the covering sheets
95
around the periphery of the barrel
91
.
The aforesaid roller blind
90
is still not satisfactory in function. Because it is difficult to keep the tension of each covering sheet
95
(which is usually a piece of meshed fabric) in balance at left and right sides, the bottom rail
92
cannot be maintained in horizontal accurately. During fabrication and assembly process of the bottom rail
92
(which is comprised of an aluminum profile and two plastic end caps at two ends of the aluminum profile), it is difficult to have the gravity weight evenly distributed in all directions. When installed in the covering sheets
95
, the bottom rail
92
may not be maintained in horizontal accurately. When the bottom rail
92
lifted to a relatively higher position close to the barrel
91
, it stands in an oblique position sloping downwards toward one lateral side of the blind (see FIG.
8
), obstructing the sense of beauty of the roller blind
90
.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a center of gravity adjustment device, which is practical for use in a window blind assembly, such as a roll-up blind, lifting-type blind, etc., for enabling the user to adjust the center of gravity of the bottom rail to keep the bottom rail in horizontal.
It is another object of the present invention to provide a window blind assembly having a center of gravity adjustable bottom rail, which enables the user to adjust the center of gravity of the bottom rail, keeping the bottom rail in horizontal.
To achieve these objects of the present invention, a center of gravity adjustment device is installed in a bottom rail of a window blind assembly for adjusting the center of gravity of the bottom rail, comprising an adjustment wheel fastened rotatably with the bottom rail for rotating by a user, a rotating wheel fastened rotatably with the bottom rail and spaced from the adjustment wheel at a distance, a weight movable in the bottom rail between the adjustment wheel and the rotating wheel, and a cord member mounted around the adjustment wheel and the rotating wheel and fastened to the weight for moving the weight in said bottom rail between the adjustment wheel and the rotating wheel upon rotation of the adjustment wheel.


REFERENCES:
patent: 3280890 (1966-10-01), Preziosi
patent: 5176192 (1993-01-01), Judkins et al.
patent: 6412537 (2002-07-01), Voss et al.
patent: 6546989 (2003-04-01), Coleman et al.
patent: 6550522 (2003-04-01), Lennon et al.

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