AN ADJUSTABLE STRUCTURE FOR ADJUSTING THE ANGLE AND THE RISE AND FALL OF CURTAIN BLADES

STRUCTURE REGLABLE PERMETTANT DE REGLER L'ANGLE ET LA LEVEE ET LA CHUTE DE LAMES DE RIDEAU

English Abstract

An adjustable structure of a curtain for adjusting the angle of curtain blade comprises a winding tube disposed in an upper rail of a curtain, a pulling string for controlling the rise and fall of the curtain winds around the winding tube and is then passed through curtain blades. One end of the winding tube is disposed with a rubbing wheel for hanging the top end of a suspending string that is provided for insertion of the curtain blades. Thereby during the rise and fall of the curtain blades, the suspending string is pulled towards the rotating direction of the winding tube firstly, so that the angle of the curtain blades is adjusted.

French Abstract

Structure ajustable d'un store vénitien pour ajuster l'angle des lames du store comprenant un tube d'enroulement placé dans un rail supérieur du store, un cordon de tirage pour monter et descendre le store, qui s'enroule autour du tube d'enroulement pour ensuite passer à travers les lames du store. L'une des extrémités du tube d'enroulement est équipée d'une roulette de blocage pour suspendre l'extrémité supérieure d'un galon vertical servant à l'insertion des lames du store. Ainsi, pendant la montée et la descente des lames du store, le galon est incliné dans le sens de la rotation du tube d'enroulement d'abord, pour que l'angle des lames du store soit ajusté.

Claims

WHAT IS CLAIMED IS:


1. An adjustable structure for adjusting the angle and the rise
and fall of curtain blades, said structure comprising an upper rail
containing two winding tubes disposed adjacent the ends of the upper
rail, each winding tube having a rubbing wheel mounted at one end
thereof so as to rotate therewith and each rubbing wheel having a
suspending string wound thereon, the suspending strings being
movable to adjust the inclinations of the curtain blades, and the
structure also including a winder that is received in the upper rail and
is operable to effect movement of two pulling strings which are wound
on the two winding tubes and pass through a plurality of curtain
blades such that movement of the pulling strings controls the rise and
fall of the curtain blades, and wherein the diameter of each rubbing
wheel is greater than the diameter of the associated winding tube.


2. An adjustable structure as claimed in claim 1, wherein the
rise and fall of the pulling strings is controlled by a winder.


3. An adjustable structure as claimed in claim 1, wherein each
rubbing wheel and the winding tube are disposed in the upper rail and
are arranged for rotation about a common axis.


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4. An adjustable structure as claimed in claim 1, wherein each
rubbing wheel and the associated winding tube are disposed in the
upper rail and are arranged for rotation in the same direction.


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Description

CA 02555707 2008-10-02

AN ADJUSTABLE STRUCTURE FOR ADJUSTING THE ANGLE
AND THE RISE AND FALL OF CURTAIN BLADES

Field of the Invention

The present invention relates to an adjustable structure for
adjusting the angle and the rise and fall of curtain blades that
comprises a winding tube disposed in an upper rail of a curtain and a
pulling string for controlling the rise and fall of the curtain, the pulling
string being wound around the winding tube and then passed through
the curtain blades.

Description of the Prior Art

Most conventional curtains are used to shield the sunlight so
that, in addition to a structure for controlling the rise and fall of the
curtain, the curtain must have a facility for adjusting the angle of the
curtain blades, so as to adjust the indoor sunlight.

Therefore, the conventional curtain typically includes two
structures: one structure is for controlling the rise and fall of the
curtain blades, and the other structure is for adjusting the angle of the
curtain blades. After the curtain blades are adjusted to a suitable

position, the angle of the blades can be controlled by the control
structure. The density of the sunlight projected into the room can thus


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be adjusted, thereby attaining the purposes of shielding and lighting.
However, since those two structures are designed and produced
separately, the conventional curtain is difficult to assemble and is of
high cost.

The present invention has arisen to mitigate and/or obviate
the afore-described disadvantages.

SUMMARY OF THE INVENTION

According to the present invention there is provided an
adjustable structure for adjusting the angle and the rise and fall of
curtain blades, said structure comprising an upper rail containing two

winding tubes disposed adjacent the ends of the upper rail, each
winding tube having a rubbing wheel mounted at one end thereof so
as to rotate therewith and each rubbing wheel having a suspending
string wound thereon, the suspending strings being movable to adjust

the inclinations of the curtain blades, and the structure also including
a winder that is received in the upper rail and is operable to effect
movement of two pulling strings which are wound on the two winding
tubes and pass through a plurality of curtain blades such that
movement of the pulling strings controls the rise and fall of the curtain

blades, and wherein the diameter of each rubbing wheel is greater
than the diameter of the associated winding tube.

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During the rotation of the winding tubes, the suspending strings
are moved such that, when the blades are risen or fallen slightly, the
angles between the blades are changed, and there will appear a dead
point after the blades are brought into contact with each other. The

curtain blades will thus be maintained in a skewed position during the
rise and fall of the curtain. After the curtain blades have been adjusted
to a predetermined position, the user can slightly reverse the curtain
blades until the angle of the blades meets the needs of the user.

The winding tubes and the rubbing wheels are disposed in the
upper rail, so that the adjustable structure is easy to operate, of low
cost, and has a nice appearance.

The present invention will become more obvious from the
following description when taken in connection with the accompanying
drawings, which show, for purpose of illustrations only, the preferred
embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view of an adjustable structure for
adjusting the angle and the rise and fall of curtain blades in
accordance with the present invention;

Fig. 2 i s a detail perspective view of part of the structure
shown in Figure 1;

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Fig. 3 is an operational view of the adjustable structure of
Figure 1;

Fig. 4 is another operational view of the adjustable structure of
Figure 1;

Fig. 5 is a perspective view showing rotation of the curtain
blades of the adjustable structure of Figure 1; and

Fig. 6 is a vertical sectional view of the adjustable structure of
Figure 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An adjustable structure of a curtain for adjusting the angle and
the rise and fall of curtain blades in accordance with the present
invention comprises two winding tubes 3 disposed in an upper rail 1 of
a curtain 10, and a pulling string 21 for controlling the rise and fall of
the curtain wound around each of the winding tubes 3 and then

passed through the curtain blades 4 (as shown in Figs. 1 and 2). One
end of each winding tube 3 is provided with a rubbing wheel 31 for
hanging the top ends of two suspending strings 5 that are provided for
controlling the inclination of the curtain blades 4. Thereby, during the
rise and fall of the curtain blades 4, the suspending strings 5 are

pulled towards the rotating direction of the winding tubes 3 firstly, so
that the angles of the curtain blades 4 can be adjusted.

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Since the winding tubes 3 serve as guiding wheels when the
pulling strings 21 pull the curtain blades 4, the winding tube 3 will be
rotated by pulling on the pulling strings 21 and the positions of the
pulling strings 21 are controlled by a winder 2. Since one end of each

winding tube 3 is provided with a rubbing wheel 31, such that each
rubbing wheel 31 rotates along with the associated winding tube 3,
the suspending strings 5 hung on the rubbing wheels 31 will also be
rotated along with the winding tubes 3. However, there will appear a
dead point after the angles of the curtain blades 4 connected beneath

the suspending strings 5 are adjusted to such an extent that the
curtain blades 4 are brought into contact with each other (as shown in
Figs. 3 and 4), and the curtain blades 4 will be maintained in a skewed
position during the rise and fall of the curtain.

After the curtain blades 4 are adjusted to a predetermined
position, the curtain blades 4 can be rotated to the horizontal position
and finally adjusted to an inwardly-skewed position, and thus the
angle of the curtain blades 4 can be controlled easily. The user can
slightly reverse the curtain blades 4, since the rotation angle of the
suspending string 5 is adjusted by the rubbing wheel 31 (as shown in
the drawings).

By such arrangement, the rise and fall motion and the angle-
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adjustment of the curtain blades 4 can be achieved simultaneously.
Therefore, the curtain 10 is easy to operate, of low cost, and has a
nice appearance.

The rubbing wheel 31 rotates along with the winding tube 3,
and not limited to being coaxial with the winding tube 3. The rubbing
wheel 31 is a little bigger than the winding tube 3, i.e. has a greater
diameter than the winding tube 3, thus obtaining a bigger friction
between the suspending string 5 and the rubbing wheel 31. In
addition, the direction of the rubbing wheel 31 can be reversed to that

of the winding tube 3 (for example, the winding tube 3 and the rubbing
wheel 31 may be connected by a gear).

While we have shown and described various embodiments in
accordance with the present invention, it should be clear to those
skilled in the art that further embodiments may be made without
departing from the scope of the present invention.

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Representative Drawing