Flexible or portable closure – partition – or panel – Pleating type – With power operating means
Reexamination Certificate
2000-01-04
2001-09-04
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Pleating type
With power operating means
C160S084060, C160S265000, C160S370230
Reexamination Certificate
active
06283191
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a motorized window blind, more particularly to a motorized window blind which has telescopically fitted tubes driven by a motor to extend and retract a blind screen.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional window blind
1
is shown to include a mounting frame
11
, and a blind screen
10
which has a mounted end secured on the mounting frame
11
, a liftable end
12
, and an intermediate portion with a plurality of sheet portions
101
. Right and left guiding threads
111
,
112
have ends which are connected to a spring
13
received in the mounting frame
11
, and weave through the sheet portions
101
via holes
113
formed therein. The other end of the left guiding thread
111
passes through a left friction member
14
, and then extends along the liftable end
12
to enter a right friction member
15
so as to be fixed on a right fixing member
17
. Likewise, the other end of the right guiding thread
112
passes through the right friction member
15
, and then extends along the liftable end
12
to enter the left friction member
14
so as to be fixed on a left fixing member
16
. By means of the friction of the friction members
14
,
15
, the liftable end
12
can be moved manually to extend and retract the blind screen
10
, and can be maintained at a predetermined level.
However, when the conventional window blind
1
is mounted on a relatively high window, the moving operation of the liftable end
12
is difficult to conduct.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a motorized window blind which can be operated conveniently.
According to this invention, the motorized window blind includes a mounting frame with right and left bracket parts spaced apart from each other in a longitudinal direction, and a blind screen. The blind screen includes a mounted end mounted on the mounting frame and including first right and left side portions respectively proximate to the right and left bracket parts, a liftable end opposite to the mounted end in a transverse direction relative to the longitudinal direction and including second right and left side portions opposite to each other in the longitudinal direction, and a flexible intermediate portion interposed between the mounted and liftable ends. A motor has an output shaft and is mounted in the vicinity of the mounting frame. A drive transmitting member has a distal end, and is driven by the output shaft to move the distal end in the transverse direction between retracted and extended positions where the distal end is proximate and distal to the mounting frame, respectively. A plurality of tubes are telescopically fitted to each other. The tubes are disposed between the first right and left side portions, and extend in the transverse direction. The tubes include a tail end fixedly mounted relative to the mounting frame, and a lead end opposite to the tail end in the transverse direction and disposed to associate the liftable end with the distal end to move the liftable end when the lead end is driven by the distal end.
REFERENCES:
patent: 1272958 (1918-07-01), Hunt
patent: 5172745 (1992-12-01), Wang
patent: 5813450 (1998-09-01), Yang
patent: 2594480 (1987-09-01), None
Johnson Blair M.
Mechant & Gould P.C.
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