Modulating mechanism of venetian blind

Details Modulating mechanism of venetian blind Modulating mechanism of venetian blind

2000-11-06

2001-10-30

Purol, David M. (Department: 3634)

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

Reexamination Certificate

active

06308764

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a Venetian blind, and more particularly to a modulating mechanism of the Venetian blind.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a Venetian blind of the prior art comprises an upper rail
1
, a lower rail
2
, a plurality of cords
3
, and a plurality of slats
4
which are held by the cords
3
between the upper rail
1
and the lower rail
2
. The slats
4
are folded or unfolded by two pull cords in conjunction with an adjustment rod
5
which is used to actuate a modulating device
6
to set the slats
4
at any angle to regulate the light and the air passing through. The modulating device
6
is disposed in the upper rail
1
. In order to prevent the adjustment rod
5
from interfering the slats
4
, the worm rod
6
a
of the modulating device
6
is connected at one end of the adjustment rod
5
in such a way that the worm rod
6
a
is slantingly engaged with a worm gear
6
b
. As a result, the adjustment rod
5
and the slats
4
are separated by a distance.
The modulating device
6
of the prior art is defective in design in that the worm rod
6
a
is jutted out of the upper rail
1
such that the worm rod
6
a
is apt to interfere with the slats
4
located in proximity of the upper rail
1
at such time when the slats
4
are drawn up together to the top of the window. In addition, the modulating device
6
complicates the packaging of the Venetian blind. Moreover, the worm rod
6
a
is vulnerable to breakage in the course of transportation of the Venetian blind.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a Venetian blind modulating mechanism which does not complicate the packaging of the Venetian blind.
It is another objective of the present invention to provide a Venetian blind modulating mechanism comprising a worm rod which can be separated to avert damage in the course of transportation of the Venetian blind.
The modulating mechanism of the present invention comprises a housing in which a worm gear is pivoted such that the worm gear is engaged with one end of a worm shaft. The other end of the worm shaft is jutted out of the housing. The worm shaft is formed of a link member and an action member. The link member is engaged at one end with the worm gear and is connected at other end with one end of the action member. The other end of the action member is jutted out of the housing.


REFERENCES:
patent: 3921695 (1975-11-01), Debs
patent: 4507831 (1985-04-01), McClure
patent: 4875516 (1989-10-01), Marocco
patent: 4955248 (1990-09-01), Lindstrom
patent: 5002113 (1991-03-01), Georgopoulos
patent: 5092387 (1992-03-01), King et al.
patent: 5186229 (1993-02-01), Hsu
patent: 5396945 (1995-03-01), Meyer

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