Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2000-02-18
2001-04-10
Purol, David M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
Reexamination Certificate
active
06213188
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a control device, more particularly to a cord control device for a Venetian blind to control raising and lowering of the slats.
DESCRIPTION OF THE RELATED ART
Referring to
FIG. 1
, a conventional Venetian blind includes an elongated housing
1
, a horizontally disposed shaft
2
journalled in the housing
1
, a plurality of slats
5
suspended one above another from the housing
1
, a bottom rail
7
disposed below the slats
5
, a pair of pulleys
3
provided on two end portions of the shaft
2
, a cord control unit
8
provided at one end of the housing
1
, and two pairs of tilting cords
4
. Each of the tilting cords
4
is disposed at a longitudinal side of each of the slats
5
, and has a top end secured to one of the pulleys
3
and a bottom end secured to the bottom rail
7
so that rotation of the shaft
2
can cause the tilting cords
4
to move up and down in order to tilt the slats
5
. Each of the slats
5
has two end portions, each of which is formed with a through hole (
5
a
). Each of two pull cords
6
has a first end passing through the vertically aligned through holes (
5
a
) formed in the slats
5
and secured to the bottom rail
7
, and a second end passing through the housing
1
and the cord control unit
8
and extending out of the housing
1
.
Referring to
FIG. 2
, the cord control unit
8
is shown to include a stationary roller (
8
a
) and a movable pinion (
8
b
). The pull cords
6
pass between the stationary roller (
8
a
) and the movable pinion (
8
b
), and are operable to move the movable pinion (
8
b
) toward the stationary roller (
8
a
) so as to lock the pull cords
6
and so as to position the slats
5
, or away from the stationary roller (
8
a
) so as to release the pull cords
6
and to permit raising or lowering of the slats
5
.
The aforesaid conventional Venetian blind achieves the purposes of raising and lowering the slats
5
. However, the cord control unit
8
has to be mounted at one end of the top housing
1
, thereby restricting the moving space of the pull cords
6
with respect to the side wall adjacent to said end of the top housing
1
and resulting in inconvenience when operating the pull cords
6
.
Furthermore, in case the horizontal length of the top housing
1
in the conventional Venetian blind is over sized and does not correspond to the size of a window to which the blind is applied, the top housing
1
has to be cut short. However, the top housing
1
cannot be cut short at two ends thereof in order to achieve the required length due to the presence of the cord control unit
8
at one of the ends thereof.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a cord control device which is adapted be mounted in a Venetian blind and which is clear of the aforesaid disadvantages that result from the use of the conventional Venetian blind.
Accordingly, the cord control device of the present invention is used in a Venetian blind which includes an elongated horizontal top housing, a plurality of horizontal slats suspended downwardly from the top housing one above another, a bottom rail disposed below the slats, a pair of pulleys disposed spacedly in the top housing, and at least one first control cord and at least one second control cord. Each of the control cords passes through the top housing and through the slats, and has a first end portion fastened to the bottom rail, and a second end portion which extends out of the top housing. The cord control device includes a hollow mounting seat adapted to be mounted removably in the top housing between the pulleys, and having a bottom end, a top end, a roller-mounting space between the top and bottom ends, and an elongated rack disposed in the roller-mounting space. A pair of stationary rollers are journalled in the roller-mounting space one above the other proximate to the elongated rack. The first control cord is adapted to pass slidably over a lower one of the stationary rollers while the second control cord is adapted to pass slidably over and between the stationary rollers. A movable pinion is disposed movably in the roller-mounting space, and is adapted to be passed slidably over by the second end portions of the first and second control cords. The pinion is movable to a first position by virtue of swinging action of the first and second control cords in a first direction, where the control cords can slide over the pinion to permit raising and lowering of the slats, and a second position by virtue of swinging action of the first and second control cords in a second direction opposite to the first direction, where the pinion is clamped between the rack and one of the stationary rollers so that the control cords are adapted to be clamped between the pinion and the respective one of the stationary rollers, thereby preventing raising and lowering of the slats. A stop unit is provided to prevent removal of the pinion from the roller-mounting space in the mounting seat.
REFERENCES:
patent: 2357911 (1944-09-01), Schaefer
patent: 2493186 (1950-01-01), Delgaudio
patent: 2594637 (1952-04-01), Gertzon
patent: 3952789 (1976-04-01), Marotto
patent: 4180118 (1979-12-01), Vecchiarelli
patent: 4245688 (1981-01-01), Vecchiarelli
patent: 4327797 (1982-05-01), Nakajima et al.
patent: 4463791 (1984-08-01), McClure
patent: 4667723 (1987-05-01), Spangenberg
patent: 4945970 (1990-08-01), Marocco
patent: 4947921 (1990-08-01), Chun-cheng
Ladas & Parry
Purol David M.
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