Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
1999-10-27
2001-01-23
Purol, David M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
C160S115000
Reexamination Certificate
active
06176290
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a Venetian blind, and more particularly to an improved device for adjusting the slats of the Venetian blind.
BACKGROUND OF THE INVENTION
The U.S. Pat. No. 4,621,672 issued to this inventor of the present invention discloses a horizontal Venetian blind comprising a plurality of upper slats and lower slats, whose bevels are separately controlled. The Venetian blind is provided with two sets of mechanisms to control the upper group of slats and the lower group of slats. The device comprises a movable stem 36 which is fastened at the top end thereof with the spring plate 40, and at the bottom end thereof with a hand operated lever 43. The movable stem 36 is provided with a gear 37 which is engaged with the internal gear 34
a
of the worm 34 for driving the worm wheel 32. At the time of the downward pulling, the gear 37 is engaged with the gear 35
a
of the worm rod 35 for driving the worm wheel 33. The worm wheels 32 and 33 are coupled with two shafts 21 and 22, which can be driven to turn at will. Such a prior art device as described above can not be produced in quantity at a low cost.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a Venetian blind with a device for adjusting slats of the Venetian blind in multiple steps. The device can be economically made in quantity.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a device comprising an upper rail which is provided at one end thereof with a seat. An upper worm rod and a lower worm rod are coaxially pivoted in the seat such that the two worm rods are engaged with an upper worm wheel and a lower worm wheel, which are coupled with two cross shafts. A movable stem has an upper segment which is located in the seat such that the upper segment is engageable with the center holes of the two worm rods, and that the lower segment is connected with a control lever. The seat is further provided with a coil spring which is fitted over the movable stem such that the bottom end of the coil spring urges the seat, and that the top end of the coil spring urges the movable stem. The movable stem is provided with a driving portion. The center holes of the upper worm rod and the lower worm rod are provided with a retaining portion in which the driving portion of the movable stem is retained at the time when the movable stem is located at the upper stop point. When the movable stem is pulled downward by an external force, the driving portion of the movable stem is retained in the retaining hole of the lower worm rod. When the movable stem is relieved of the external force exerting thereon, the movable stem is forced by the coil spring to return to the upper stop point.
REFERENCES:
patent: 4621672 (1986-11-01), Hsu
patent: 4657061 (1987-04-01), Meier
patent: 4869308 (1989-09-01), Chang
patent: 5119868 (1992-06-01), Werner
Browdy and Neimark
Ching Feng Blinds Ind Co., Ltd.
Purol David M.
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