Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2000-11-16
2002-06-18
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
C160S17610P, C074S089280, C074S66500G, C074S42100R, C074S42100R, C049S118000, C049S362000
Reexamination Certificate
active
06405782
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to blinds for regulating the light and, more specifically, to a transmission system for a motor-driven blind, which is operated to move vertical slats toward the center area or two sides between the extended position and the extended position.
In order to eliminate the drawback of manual operation, various blinds with motor-driven transmission system have been disclosed.
FIGS. 1 and 2
illustrate a blind with a motor-driven transmission mechanism according to the prior art. As illustrated, the blind
10
comprises a first power drive
12
and a second power drive
23
reversely disposed at two ends of the top track
11
. The first power drive
12
comprises a motor
13
, a belt transmission mechanism
14
, an axle
15
coupled to the motor
13
through the belt transmission mechanism
14
, a transmission gear train
16
, a transmission shaft
17
coupled to the belt transmission mechanism
14
through the transmission gear train
16
, a worm
19
supported in carriers
18
and coupled to the transmission shaft
17
, and a worm gear
20
meshed with the worm
19
and driven by the worm
19
to rotate respective hooks
21
and the vertical slats
22
at the hooks
21
forwards/backwards within a limited angle. The second power drive
23
comprises a motor
24
, a belt transmission mechanism
25
, an axle
26
coupled to the motor
24
through the belt transmission mechanism
25
, a transmission gear train
27
, and a lead screw
28
inserted through the carriers
18
and threaded into a nut
29
in the first carrier and coupled to the belt transmission mechanism
25
through the transmission gear train
27
. Upon rotary motion of the lead screw
28
, the first carrier is caused to move along the lead screw
28
. The carriers
18
are coupled to one another by link means
30
, so that the carriers
18
are moved one after another in one direction to receive or extend out the vertical slats
22
upon rotary motion of the lead screw
28
. Therefore, when the motor
24
is turned in one direction, the slats
22
are extended out. On the contrary, when the motor
24
is turned in the reversed direction, the slats
22
are received together. This structure of the blind is functional. However, the slats
22
can only be moved from the left (right) side to the right (left) side to the extended or received position, i.e., the slats
22
cannot be moved from two sides toward the center area to the extended position, or from the center area toward the two sides to the received position. In a big scale blind, moving the slats between the received position and the extended position takes much time and consumes much power supply. Further, because the slats are moved in same direction, the motion of the slats is not symmetrical, i.e., the motion of the slats is not visually harmony.
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 transmission system for a motor-driven blind, which is operated to move vertical slats toward the center area or two sides between the extended position and the received position. According to one aspect of the present invention, the transmission system is installed in the track of a motor-driven blind and controlled to move vertical slats of the motor-driven blind between a received position and an extended position and to rotate the vertical slats in regulating the light after the vertical slats have been moved to the extended position. According to another aspect of the present invention, the transmission system includes a first power drive controlled to rotate the vertical slats to the desired angle through a transmission shaft and worm and worm gear sets, and a second power drive controlled to move the vertical slats from the ends of the track toward the middle or from the middle of the track toward the ends between the extended position and the received position through two reversed screws.
REFERENCES:
patent: 1355152 (1920-10-01), Laird
patent: 1748948 (1930-03-01), Gassen
patent: 2848045 (1958-08-01), Bennett
patent: 2853793 (1958-09-01), Ripp et al.
patent: 3003552 (1961-10-01), Eilenberger
patent: 3208507 (1965-09-01), Breen
patent: 3789905 (1974-02-01), Saito
patent: 4449564 (1984-05-01), Hansen et al.
patent: 4773464 (1988-09-01), Kobayashi
patent: 4878528 (1989-11-01), Kobayashi
patent: 5893236 (1999-04-01), Krbec et al.
patent: 6024156 (2000-02-01), Chu
patent: 6032416 (2000-03-01), Springer et al.
patent: 406300105 (1994-10-01), None
patent: 1821599 (1993-03-01), None
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