Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2000-11-06
2001-12-04
Purol, David M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
Reexamination Certificate
active
06325133
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
The Venetian blind is made of a number of slats that can be set together at any angle to regulate the light and the air to pass through, or be drawn up together to the top of the window by means of cords. The angle of the slats is adjusted by a modulating mechanism in conjunction with an adjustment rod.
As shown in
FIG. 1
, the conventional modulating mechanism is mounted in the upper rail of the Venetian blind such that the worm rod
2
is slantingly engaged with the gear
3
, so as to prevent the adjustment rod
1
from interfering the slats. The worm rod
2
is thus jutted out of the upper rail such that one end of the worm rod
2
is kept a distance away from the slats, thereby enabling the adjustment rod
1
and the slats to separate from one another. However, the portion of the worm rod
2
that is jutted out of the upper rail is apt to interfere with the slats located in proximity of the upper rail at the time when the slats are drawn up together to the top of the window. In addition, the worm rod
2
is vulnerable to breakage in the course of transportation of the Venetian blind. Moreover, the conventional modulating mechanism described above is apt to complicate the packaging of the Venetian blind.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide the Venetian blind with a slat-modulating mechanism which is free of the deficiencies of the conventional mechanism described above.
The mechanism of the present invention comprises a housing in which a gear is mounted pivotally such that the gear is meshed with one end of a worm shaft. The worm shaft is formed of a link member and an extension member which is connected end to end with the link member and projects out of the housing. The connecting of the extension member with the link member is attained by a connection set.
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
Browdy and Neimark
Industrial Technology Research Institute
Purol David M.
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