Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2001-12-21
2003-05-13
Purol, David (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
Reexamination Certificate
active
06561253
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a tilt cord pulley for venetian blinds and includes two notches defined in an outer surface of the pulley so as to position the tilt cord.
BACKGROUND OF THE INVENTION
Convention venetian blinds as shown in
FIG. 1
include a head and a plurality of slats
20
and a bottom rail
16
are connected by wires
21
. The wires
21
are controlled by the head which includes a tilt rod
12
supported between two drums
13
and a pulley assembly
10
is located in an end of the head. The pulley assembly is shown in
FIGS. 2 and 3
and generally includes a pulley
15
which has two flanges
150
extending radially outward from two ends thereof and each flange
150
has a recess
151
defined therein. A driving rod
14
securely extends through a central hole
153
of the pulley
15
so as to drive the tilt rod
12
. A tilt cord
11
extends through a passage
154
in the pulley
15
and two ends of the tilt cord
11
respectively extend through the two recesses
151
and then wrap around the pulley
15
. When the user pulls either one of the two ends of the tilt cord
11
, the tilt rod
12
is rotated and change the angles of the slats
20
. However, the tilt cord
11
cannot be secured in the recesses
151
so that the tilt cord
11
could slip when being pulled and the shifted tilt cord
11
makes the tilt cord
11
loosen and cannot response the operation of the users. Although some manufacturers make a tie on the tilt cord
11
to prevent the slip of the tilt cord
11
from the recesses
151
, these ties are made by manual work and are time-consuming.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a tilt pulley for venetian blinds and the tilt pulley comprises a tubular body with two flanges extending radially outward from two ends of the body. Each of the two flanges has a recess defined therein, two notches defined in the body and respectively communicating with the two recesses. A central hole is defined centrally through the body and a passage is defined through the body.
The primary object of the present invention is to provide a tilt pulley for venetian blinds that has two notches communicating with two recesses in the flanges so as to secure the tilt cord which is not slip during pulling.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
REFERENCES:
patent: 3333905 (1967-08-01), Hennequin
patent: 3357270 (1967-12-01), Spangenberg
patent: 4484612 (1984-11-01), Vecchiarelli
patent: 5538068 (1996-07-01), Liu
patent: 5636677 (1997-06-01), Liu
patent: 5680892 (1997-10-01), Liu
Purol David
Rosenberg , Klein & Lee
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