EP3511513B1

EP3511513B1 - Fabric roller blind

Info

Publication number: EP3511513B1
Application number: EP19150980.1A
Authority: EP
Inventors: Alberto PANIZZOLO
Original assignee: Dieffepiu Srl
Current assignee: Dieffepiu Srl
Priority date: 2018-01-12
Filing date: 2019-01-09
Publication date: 2020-11-04
Anticipated expiration: 2039-01-09
Also published as: IT201800000787A1; EP3511513A1; ES2842007T3; CN110029929A

Description

Field of application

The present invention regards a fabric roller blind according to the preamble of the independent claim number 1.
The present fabric roller blind is intended to be advantageously employed for adjustably closing provided openings of building walls, in particular for windows, for doors, per French windows and similar windows/doors/shutters.
The blind, object of the present invention, is therefore inserted in the industrial field of the production of windows/doors/shutters, i.e. also in the field of the production of fabrics for sun protection, in the field of mosquito netting or of similar applications.

State of the art

Blinds are known on the market for closing openings of windows/doors/shutters (such as windows, doors or French windows) provided with a rolling-shutter box, which is fixed to a building wall or to an upright that is lateral with respect to the opening to be closed and at its interior houses a roller on which a flexible cover fabric is susceptible of being wound and unwound.
The fabric usually has rectangular shape and is provided with a first lateral edge fixed to the roller and with a second lateral edge opposite the first lateral edge and fixed to a handle bar susceptible of being gripped by a user and aimed to stretch the fabric itself during a movement thereof along a horizontal direction.
In addition, the blind comprises two guides arranged horizontally along the corresponding upper and lower walls which define the opening and to which the handle bar is slidably constrained.
In particular, the handle bar comprises an aluminum section closed at the upper and lower ends by two terminations slidably coupled to the respective horizontal guides.
Normally, each of the upper and lower horizontal guides is generally obtained by means of an aluminum section fixed to the upper or lower wall which defines the opening. Each aluminum section of the two guides is provided with a longitudinal slit which is extended along the extension of the same section and which slidably houses at its interior the corresponding upper or lower terminal of the handle bar. The slits of the two guides face each other and delimit the two sides of the opening to be closed with the windable fabric.
The handle bar is movable by a user between an open position, in which it is side-by-side the rolling-shutter box with the fabric completely wound around the roller, so as to free the opening to be screened, and a closed position in which the handle bar is side-by-side the opposite lateral wall, with the fabric substantially completely unwound from the roller and placed to close the opening.
In operation, starting from the open position, the user grips the handle bar and drives it along the horizontal guides up to the desired position, e.g. up to the closed position, in which the fabric is placed to completely cover the opening.
During this movement, the upper and lower terminals of the handle bar respectively slide along the upper and lower guides.
The blinds of known type briefly described up to now have in practice proven that they do not lack drawbacks.
A first drawback of the blinds of known type lies in the fact that for the movement of the handle bar between the open position and the closed position, the handle bar may be gripped not exactly at the midpoint of its height but in a non-centered position, e.g. in proximity to one of the ends thereof. Such circumstance implies that the handle bar is more greatly moved along the guide closest to where the handle bar has been gripped by the user and to a lesser extent along the guide further away from where the handle bar has been gripped by the user.
This determines a non-alignment between the two ends of the handle bar, i.e. in other words there will be one end of the handle bar more advanced in the direction of its movement and one end more retreated in the direction of its movement. Such non-alignment of one end of the handle bar with respect to the other brings the fabric roller to be stretched in a non-uniform manner, forming bends that can in the long term also lead to the deterioration and hence also to the breakage of the fabric itself.
In addition, such non-alignment leads to an undesired deterioration of the terminals inserted in the horizontal guides due to the stresses to which they are continuously subjected. In addition, following such non-alignment, it can happen that the same terminals exit outward from the horizontal guides, requiring the intervention by a specialized technician.
In order to at least partially overcome such drawbacks of the abovementioned prior art, fabric roller blinds, also of known type, have been developed which are provided with means for aligning the terminals of the handle bar, which maintain the terminals thereof vertically aligned during the movement of the same handle bar between the open and closed positions.
Known from the patent EP 2530236 is an example of a fabric roller blind, which is provided with the main members and components indicated above and with alignment means housed in the handle bar. More in detail, the fabric roller is constituted by an anti-mosquito net, with substantially rectangular shape, which is fixed at a lateral end thereof to the take-up roller which is housed within the vertical rolling-shutter box and at the other end is fixed to the handle bar, which is susceptible of being gripped by a user in order to move the blind between the open and closed positions.
The fabric roller blind of known type described in this patent EP 2530236 comprises a guide chain composed of a plurality of elements pivoted to each other in succession and capable of rotating with respect to each other only in one rotation sense, so as to attain - when extended aligned in succession - a member that is rigid in the opposite rotation direction, susceptible of attaining a guide for the fabric. Such elements are housed within a corresponding vertical seat made within the handle bar when the blind is in open position. The chain is constrained at one end thereof to the rolling-shutter box in which the take-up roller is housed, while the other end is slidably inserted within the vertical seat of the handle bar.
When the blind is moved from the open position to the closed position, the guide chain is driven outside the vertical seat of the handle bar, being set on the lower wall (usually the floor or a windowsill) which delimits the opening to be screened, thus acting as lower guide for the fabric.
The guide chain, with the blind in closed position, therefore defines a horizontal rectilinear guide for the fabric, which allows retaining it in the spread-out position to close the opening to be screened.
Such fabric roller blind of known type also comprises, as stated, means for aligning the terminals of the handle bar in order to remedy their vertical non-alignment, or a different sliding in the horizontal direction of the two terminals, even if the handle bar is gripped and driven in proximity to one of the ends thereof.
In accordance with such blind of known type, the alignment means comprise an upper flexible element and an intermediate flexible element.
The upper flexible element consists of a flexible metal strap with curved section placed in proximity to upper rectilinear guide, fixed on one side to the vertical upright and fixed on the other side to the intermediate flexible element.
More in detail, the intermediate flexible element consists of a flexible metal strap, which is fixed on one side to the guide chain and on the other side is fixed to the upper flexible element by means of a movable carriage.
The upper flexible element and the intermediate flexible element are both fixed to the movable carriage and the latter is slidably inserted within a vertical rail made within the handle bar, substantially parallel to the vertical seat for the elements of the guide chain.
The upper flexible element and the intermediate flexible element are both susceptible of rotating around a transmission pulley pivoted within the handle bar around a horizontal rotation axis that is transverse to the lying plane of the fabric, with the handle bar in closed position. Upon rotating the transmission pulley, the movable carriage slides along the vertical rail made within the handle bar, allowing the handle bar itself to be moved between the open position and the closed position.
Such metal strap along with the guide chain, when extended during the opening of the handle bar, defines a rigid member in the sense that it does not allow the upper terminal to return backward, i.e. to remain back with respect to the lower terminal.
Also the blind of known type described in the document EP 2530236 and briefly described up to now has in practice shown that it does not lack drawbacks.
The main drawback lies in the fact that the means for aligning the blind of the above-described type are complex to make and install and consequently involve high production and installation costs.
A further drawback lies in the fact that the vertical rail in which the movable carriage - on which the upper and intermediate flexible elements are fixed - is slidably inserted considerably increases the total size of the handle bar, which is bulky and aesthetically not particularly agreeable.
A further drawback of the fabric roller blind of known type lies in the fact that the movable carriage moved within the vertical rail made within the handle bar is susceptible of being blocked and/or jammed within the vertical rail itself, due to possible non-alignments or an erroneous movement of the handle bar by the user.

Presentation of the invention

In this situation, the problem underlying the present invention is to provide a fabric roller blind, which is structurally simple and inexpensive to make and install and which therefore has limited production and installation costs.
A further object of the present invention is to provide a fabric roller blind which is provided with a handle bar provided with a limited bulk, which is also aesthetically pleasing the eyes of the user.
A further object of the present invention is to provide a fabric roller blind which is entirely reliable in operation and does not involve risks of blocking and/or jamming. These objects are all attained by the fabric roller blind, object of the present invention.

Brief description of the drawings

The technical characteristics of the invention, according to the aforesaid objects, can be clearly seen in the contents of the below-reported claims and the advantages thereof will be more evident in the following detailed description, made with reference to the enclosed drawings which represent a merely exemplifying and non-limiting embodiment of the invention, in which:

figure 1 shows a front perspective view of the fabric roller blind, object of the present invention;
figure 2 shows a front perspective view of the fabric roller blind, object of the present invention, with some parts removed in order to better illustrate other parts;
figure 3 shows a detail of the fabric roller blind, object of the present invention, relative to an upper end of the handle bar and to a head portion of a lateral upright, with some parts removed in order to better illustrate other parts;

figure 4 shows a sectional perspective view of a detail of the blind illustrated in figure 1, relative to a handle bar and to alignment means contained at its interior;
figure 5 shows a detail of the fabric roller blind, object of the present invention, relative to elastic return means housed in the handle bar, with some parts removed in order to better illustrate other parts;
figure 6 shows a detail of the fabric roller blind, object of the present invention, relative to an upper end of the handle bar and to a head portion of a lateral upright, with some parts removed in order to better illustrate other parts;
figure 7 shows a detail of the fabric roller blind, object of the present invention, relative to elastic return means housed in the handle bar, with some parts removed in order to better illustrate other parts.

Detailed description of a preferred embodiment

With reference to the enclosed drawings, reference number 1 overall indicates the fabric roller blind, object of the present invention.
The blind 1 is operatively employable for adjustably closing an opening A of a window/door/shutter, e.g. a window, a door or a French door, made in a load-bearing structure such as the building wall of a building.
In accordance with the embodiment illustrated in the enclosed figure 1, the fabric roller blind, object of the present invention, comprises a support frame 2 provided with at least one lateral upright 3 and intended to be fixed to the load-bearing structure in which the opening A is made, which is advantageously defined at least between two lateral walls, an upper wall and a lower wall.
The support frame 2 can be fixed to the load-bearing structure at the opening by embedding it within the masonry or wooden section, or fixed with front mounting on the internal or external face of the building wall in which the opening is made. Preferably, the lateral upright 3 of the support frame 2 comprises a rolling-shutter box 39 intended to be laterally positioned with respect to the opening A to be screened. Advantageously, the rolling-shutter box 39 comprises a hollow tubular body, in particular obtained with an aluminum extrusion, which is extended with substantially vertical axis between two opposite upper and lower ends.
The blind 1 also comprises at least one take-up roller 4 having a substantially vertical rotation axis X and rotatably connected to the lateral upright 3 of the support frame 2 and preferably housed within the rolling-shutter box 39.
The blind 1, object of the present, invention also comprises at least one fabric 5, which preferably has rectangular shape and is extended between a first lateral edge thereof fixed to the take-up roller 4 and a second lateral edge thereof opposite the first lateral edge.
The fabric 5 can be intended for making a shading screen, e.g. in substitution of a rolling shutter, of a brise soleil screen for filtering the solar light or for making a mosquito netting. Generally, the fabric 5 can be dedicated to closing the opening of a window/door/shutter in order to protect an internal area from the sun and/or from the wind and/or, more generally, from the atmospheric conditions of the outside environment.
The fabric 5, as a function of its different applications, can be made of synthetic or natural material fabric and can have the shape of a mesh in order to prevent the entrance of insects or have a continuous surface of shading, filtering or transparent type.
The fabric 5 wound around the take-up roller 4 advantageously passes through a vertical slit which is made on a lateral wall of the rolling-shutter box 3 which is directed towards the opening A.
The blind 1 according to the invention also comprises at least one handle bar 6, to which the second lateral edge of the fabric 5 is fixed. Such handle bar 6 is advantageously extended along an extension axis Z substantially parallel to the rotation axis X of the take-up roller 4 between a lower terminal 40 and an upper terminal 18. Advantageously, the handle bar 6 is made with a hollow tubular body, in particular obtained with an aluminum extrusion.
The handle bar 6 is internally provided with at least one vertical seat, in particular made within the aluminum extrusion, and is extended along the extension axis Z starting from the lower terminal 40.
The handle bar 6 is movable between at least one open position, in which the handle bar 6 is placed in a proximal position with respect to the take-up roller 4 at least partially freeing the opening A of the fabric 5, and at least one closed position, in which the handle bar 6 is placed in a distal position with respect to the take-up roller 4 with the fabric 5 at least partially covering the opening A.
A second lateral upright 41 is advantageously provided, arranged on a lateral wall which defines the opening A, in a position facing the lateral upright 21 with the rolling-shutter box 3 associated therewith.
The handle bar 6 is mechanically associated with such second lateral upright 41 when it reaches closed position. Such second lateral upright 41 advantageously also arranges locking/unlocking means (not illustrated in the enclosed figures) for stopping the handle bar 6 in closed position or for releasing it so as to allow the return thereof in open position.
The blind 1 also comprises at least one guide chain 7 susceptible of being extended below the fabric 5, so as to guide the lower edge of the fabric 5 itself during the movement of the handle bar 6 between the open position and the closed position.
The guide chain 7 is movable between a retracted position, in which it is housed within the vertical seat of the handle bar 6 with the handle bar 6 in open position, and an extended position in which it is unwound below the fabric 5 with the handle bar 6 in closed position.
In accordance with the preferred embodiment illustrated in the enclosed figures, the guide chain 7 comprises a plurality of aligned guide elements 42 that are mechanically connected to each other.
More in detail, each guide element 42 of the guide chain 7 is on one side provided with at least one pin and on the other side is provided with at least one recess, shaped for containing the corresponding pin of an adjacent guide element 42. In this manner, each guide element 42 is rotatably connected to two adjacent guide elements 42.
In this manner, the guide chain 7 is movable in a flexible manner from the retracted position to the extended position.
Advantageously, the guide chain 7 - in extended position below the fabric 5 - constitutes a base for the fabric 5 itself, since each guide element 42 is abutted against the bottom wall which delimits the opening and connected to at least one and in particular two contiguous guide elements 42.
The guide chain 7 is extended preferably between a seventh end fixed to the lateral upright 3 of the support frame 2 at the bottom wall which delimits the opening A and an eighth end 44 slidably inserted within the vertical seat made in the handle bar 6.
In accordance with the preferred embodiment illustrated in the enclosed figures, the support frame 2 of the blind 1, object of the present invention, comprises a guide edge 45 intended to be fixed on the lower wall which defines the opening A and adapted to guide the guide chain 7 while it is set on the lower wall in its movement from the retracted position to the extended position, i.e. during the movement of the handle bar 6 from the open position to the closed position.
In operation, so as to screen the opening A with the fabric 5, the user moves the handle bar 6 of the blind 1 in order to bring it from the open position to the closed position. The guide chain 7, which initially is housed within the vertical seat made in the handle bar 6, slides within the latter and is set on the bottom wall which delimits the opening A to be screened, along the guide edge 45 arranged on the bottom wall.
In the same manner, in order to free the opening A of the fabric 5, the user moves the handle bar 6 in order to bring it from the closed position to the open position. In this situation, the guide chain 7, constrained on one side to the upright 3 of the support frame 2, is thrust to slide in the seat made in the handle bar 6.
Advantageously, the handle bar 6 comprises a shaped slide placed at its lower terminal 40 shaped to accompany the guide chain 7 during its movement entering into and exiting from the vertical seat made in the handle bar 6.
The blind 1 according to the invention also comprises at least one upper flexible belt 9 extended with a first end 14 mechanically connected to the lateral upright 3 of the fixed frame 2 and a second end 15 opposite the first end and susceptible of being unwound above the fabric 5.
The blind 1 also comprises at least one intermediate flexible belt 10 extended between a third end 16 connected to the second end 15 of the upper flexible belt 9 and a fourth end 17 connected to the guide chain 7.
More in detail, the fourth end 17 is connected to the eighth end 44 of the guide chain 7. According to the idea underlying the present invention, the blind 1 also comprises at least one reel 11 having a substantially horizontal second rotation axis Y, rotatably connected to the handle bar 6 at its upper terminal 18.
The upper flexible belt 9 and the intermediate flexible belt 10 are susceptible of being wound around the reel 11 in a common winding direction.
In addition, according to the idea underlying the present invention, the blind 1 comprises elastic return means 12 mechanically associated with the reel 11 and configured for forcing the winding of the upper flexible belt 9 and of the intermediate flexible belt 10.
Advantageously, the upper flexible belt 9 and the intermediate flexible belt are made of flexible metal material.
Advantageously, the upper flexible belt and the intermediate flexible belt are provided with a curved transverse section, so as to maintain them rectilinear when the handle bar 6 is placed in its closed position.
In accordance with the preferred embodiment of the present invention illustrated in the enclosed figures, the elastic return means 12 comprise a spiral spring 13 housed within the reel 11.
Advantageously, the reel 11 comprises a cylindrical wall 23 which is provided with an annular wall 24 extended around the second rotation axis Y and defining at its interior a housing chamber 25 with substantially cylindrical shape. The spiral spring 13 of the elastic return means 12 is housed within the housing chamber 25 of the reel 11.
The annular wall 24 defines, outside the housing chamber 25, a winding surface 48 around which the aforesaid upper flexible belt 9 and intermediate flexible belt 10 are wound when the handle bar 6 is moved from the closed position to the open position. Preferably, the winding surface 48 is provided with a curved transverse section, i.e. provided with a convexity provided in a substantially central position with respect to its transverse extension which is extended over the entire annular extension of the winding surface 48 itself.
In this manner, the upper flexible belt 9 and the intermediate flexible belt 10 wound around the winding surface 48, both provided with curved transverse section, are supported by the reel 11 for their entire lower surface, avoiding the risk of crushing them and ruining the transverse section thereof during the winding around the reel 11 itself.
Preferably, the cylindrical body 23 of the reel 11 also comprises two lateral walls 46 with substantially circular form and placed as a lateral closure of the housing chamber 25, defining it together with the annular wall 24.
The lateral walls 46 perimetrically terminate with two annular sides 47 which projectingly protrude at the edges of the annular wall 24.
The annular sides 47 are opposite each other and together enclose a winding area in order to allow the winding of the upper flexible belt 9 and of the intermediate flexible belt 10 around the reel 11 in a secure manner, avoiding the risk of a non-alignment of the flexible belts 9, 10 with respect to the reel 11.
In accordance with the preferred embodiment illustrated in the enclosed figures, the upper terminal 18 of the handle bar 6 comprises a cover casing 27 provided with at least one containment wall 28 arranged along a plane substantially transverse to the second rotation axis Y and a pin 26, which protrudes in projection from the containment wall 28 within the housing chamber 25 of the reel 11, in which the reel 11 is susceptible of rotating around the pin 26.
More in detail, at least one lateral wall 46 and preferably both the lateral walls 46 are each provided with a through window crossed by the pin 26 of the cover casing 27. The windows made on the lateral walls 46 are aligned with each other along the second rotation axis Y and provided in a position substantially central with respect to the circular extension of the lateral walls 46 themselves.
In this manner, the pin 26 also acts as a mechanical support for the reel 11, which is maintained in a raised position by the pin 26 itself.
In addition, the pin 26 crosses the housing chamber 25 in a substantially central position.
Advantageously, the spiral spring 13 of the elastic return means 12 comprises a third flexible belt having a first transverse extension D and wound as a spiral around the pin 26 of the cover casing 27 and is extended between a fifth end 29 mechanically associated with the pin 26 and a sixth end 30 passing through a passage opening 31 made on the cylindrical wall 24 of the reel 11.
Advantageously, the sixth end 29 of the spiral spring 13 of the elastic return means 12 is mechanically connected to the second end 15 of the upper flexible belt 9 and to the third end 16 of the intermediate flexible belt 10.
In this manner, the spiral spring 13 forces the upper flexible belt 9 and the intermediate flexible belt 10 to be wound around the reel 11 and also forces them to be taut when the handle bar 6 is in closed position and the flexible belts 9, 10 are unwound on the reel 11.
In accordance with the preferred embodiment illustrated in the enclosed figures, the intermediate flexible belt 10 is susceptible of sliding within the vertical seat made in the handle bar 6.
More in detail, the intermediate flexible belt 10, whose fourth end 17 of the intermediate flexible belt 10 is connected to the eighth end 44 of the guide chain 7, is unwound within the aforesaid vertical seat when the handle bar is moved into its closed position. In accordance with the preferred embodiment illustrated in the enclosed figures, the second end 15 of the upper flexible belt 9 is provided with a first through hole 19 and the third end 16 of the intermediate flexible belt 10 is provided with a second through hole 22 aligned with the first through hole 19 of the upper flexible belt 9.
In addition, the sixth end 30 is provided with a coupling portion 20 arranged to cross the first through hole 19 and the second through hole 22 in order to mechanically connect the second end 15 of the upper flexible belt 9 and the third end 16 of the intermediate flexible belt 10 to the sixth end 30 of the spiral spring 13.
Advantageously, the coupling portion 20 of the sixth end 30 of the spiral spring 13 comprises a connection section 32 having a second transverse extension D1 smaller than the first transverse extension D and arranged to cross the first through hole 19 of the second end 15 of the upper flexible belt 9 and the second through hole 22 of the third end 16 of the intermediate flexible belt 10.
In addition, the blocking section 33 is advantageously provided with two wings 21 defining, together with the connection section 32, two undercut recesses 33 arranged to block the sixth end 30 of the spiral spring 13 against the second end 15 defining the first through hole 19 and against the third end 16 defining the second through hole 22.
In accordance with the preferred embodiment illustrated in the enclosed figures, the first through hole 19 and the second through hole 22 have substantially triangular form.
In order to act as a mechanical abutment for the elastic force exerted by the spiral spring 13 of the elastic return means 12, the pin 26 of the cover casing 27 is provided with a groove 34 in which the fifth end 29 of the spiral spring 13 itself is inserted.
In accordance with a second embodiment not illustrated in the enclosed figures, the elastic return means 12 comprise at least one first section of the upper flexible belt 9, extended starting from the second end 15 and a second section of the intermediate flexible belt 10 extended starting from the third end 16.
Such first and second section of the upper flexible belt and of the intermediate flexible belt 9, 10 are wound on each other according to a concordant rotation sense around the pin 26.
In accordance with this second embodiment, the upper flexible belt and the intermediate flexible belt 9, 10 are made of elastic metal material, such as in particular harmonic steel.
Advantageously, the lateral upright 3 comprises connection means 35 arranged at a head portion 36 of the lateral upright 3 adapted to mechanically connect the first end 14 of the upper flexible belt 9 to the lateral upright 3.
More in detail, the first end 14 of the upper flexible belt 9 is provided with a third through hole 38 and the connection means 35 of the lateral upright 3 comprise a tooth 37 fixed to the lateral upright 3, extended along an axis substantially parallel to the rotation axis X of the take-up roller 4 and inserted within the third through hole 38 of the first end 14 of said upper flexible belt 9.
In order to adjust the tensioning of the upper flexible belt 9, the connection means 35 comprise a worm screw 49 housed within the head portion 36 of the lateral upright 3 and extended along a substantially horizontal direction.
Such worm screw 49 is advantageously provided with a head accessible from outside and bearing, mounted thereon, the tooth 37 of the connection means 35.
Preferably, the tooth 37 is provided with a threaded through hole, wound around the worm screw 49 by means of shape coupling of screw-nut screw type.
In operation, the user in order to vary the tensioning of the upper flexible belt, acts on the head accessible from outside of the worn screw 49 of the connection means 35 in order to move the tooth 37 along the linear extension of the worm screw itself.
The tooth 37, being mechanically constrained with the third through hole 38 of the upper flexible belt 9, drives the latter along a substantially horizontal direction, varying its tensioning with respect to the reel 11, at which its second end 15 is fixed.
In accordance with a further embodiment not illustrated in the enclosed figures, the support frame 2 of the blind 1, object of the present invention, comprises two facing lateral uprights 3 that are intended to be fixed, each to a respective lateral wall of the structure that defines the opening A.
In accordance with such embodiment, the blind 1 comprises two take-up rollers 4, each arranged at the corresponding lateral upright 3, at the sides of the opening A, two fabrics 5 and two handle bars 6.
Each fabric 5 is extended between a corresponding first lateral edge fixed to the corresponding take-up roller 4 and a second lateral edge fixed to a corresponding handle bar 6.
Advantageously, each handle bar 6 in accordance with this further embodiment is movable between an at least one open position, in which the handle bar 6 is placed in a proximal position with respect to the corresponding take-up roller 4, laterally with respect to the opening A at least partially freeing the latter of the fabric 5, and at least one closed position, in which the handle bar 6 itself is placed in a distal position with respect to the corresponding take-up roller 4, in a substantially central position with respect to the horizontal extension of the opening A.
In closed position, the two handle bars 6 of the blind 1 face each other in a substantially middle position with respect to the horizontal extension of the opening A, at least partially screening the latter with the two respective fabrics 5.
Preferably, so as to completely screen the opening A, the two handle bars 6 in closed position are in contact with each other.
In operation, in accordance with this further embodiment, the user grips both handle bars 6 (simultaneously or first one and then the other) in order to move them between the respective open and closed positions.
Otherwise, the user can move only one handle bar 6 in order to only screen one portion of the opening A.
The finding thus conceived therefore attains the pre-established objects.
In particular, the blind, object of the present invention, is structurally simple and inexpensive to make and to install since, during mounting, it is sufficient to connect the second end 15 of the upper flexible belt 9 and the third end 16 of the intermediate flexible belt 10 to the sixth end 10 of the spiral spring 13 of the elastic return means 12.

Claims

Fabric roller blind (1), which comprises:
- a support frame (2) provided with at least one lateral upright (3) and intended to be fixed to a load-bearing structure in which an opening (A) is made, which is defined at least between two lateral walls, an upper wall and a lower wall;

- at least one first take-up roller (4) having a substantially vertical first rotation axis (X) rotatably connected to said lateral upright (3) of said support frame (2);

- at least one fabric (5) extended between a first lateral edge thereof fixed to said take-up roller (4) and a second lateral edge thereof opposite said first lateral edge;

- at least one handle bar (6), which is fixed to the second lateral edge of said fabric (5), said handle bar (6) extended along an extension axis (Z) substantially parallel to the first rotation axis (X) of said take-up roller (4), internally provided with at least one vertical seat and movable between:
- at least one open position, in which said handle bar (6) is placed in a proximal position with respect to said take-up roller (4), at least partially freeing said opening (A) of said fabric (5), and

- at least one closed position, in which said handle bar (6) is placed in a distal position with respect to said take-up roller (4) with said fabric (5) at least partially covering said opening (A);

- at least one guide chain (7) susceptible of being extended below said fabric (5) and movable between a retracted position, in which it is housed within said vertical seat of said handle bar (6) with said handle bar (6) in open position and an extended position in which it is unwound below the fabric (5) with said handle bar (6) in closed position;

- at least one upper flexible belt (9) extended between a first end (14) mechanically connected to said lateral upright (3) of said fixed frame (2) and a second end (15) opposite the first end and susceptible of being unwound above said fabric (5);

- at least one intermediate flexible belt (10) extended between a third end (16) connected to the second end (15) of said upper flexible belt (9) and a fourth end (17) connected to said guide chain (7);
said blind being characterized in that it also comprises:
- at least one reel (11) having a substantially horizontal second rotation axis (Y), rotatably connected to said handle bar (6) at an upper terminal (18);
said upper flexible belt (9) and said intermediate flexible belt (10) being susceptible of being wound around said reel (11) in a common winding direction;

- elastic return means (12) mechanically associated with said reel (11) and configured for forcing the winding of said upper flexible belt (9) and of said intermediate flexible belt (10).
Fabric roller blind (1) according to claim 1, characterized in that said elastic return means (12) comprise a spiral spring (13) housed within said reel (11).
Fabric roller blind (1) according to claim 2, characterized in that said reel (11) comprises a cylindrical body (23) which is provided with an annular wall (24) extended around the second rotation axis (Y) and defining at its interior a housing chamber (25) with substantially cylindrical shape;
said spiral spring (13) of said elastic return means (12) being housed within said housing chamber (25) of said reel (11).
Fabric roller blind (1) according to claim 3, characterized in that said upper terminal (18) of said handle bar comprises a cover casing (27) provided with:
- at least one containment wall (28) arranged along a plane substantially transverse to the second rotation axis (Y);

- a pin (26), which protrudes in projection from said containment wall (28) within said housing chamber (25) of said reel (11); said reel (11) being susceptible of rotating around said pin (26).
Fabric roller blind (1) according to claim 4, characterized in that said spiral spring (13) of said elastic return means (12) comprises a flexible belt having a first transverse extension (D) and wound as a spiral around said pin (26) of said cover casing (27) and is extended between a fifth end (29) mechanically associated with said pin (26) and a sixth end (30) passing through a passage opening (31) made on the cylindrical wall (24) of said reel (11).
Fabric roller blind (1) according to claim 5, characterized in that said second end (15) of said upper flexible belt (9) is provided with a first through hole (19) and said third end (16) of said intermediate flexible belt (10) is provided with a second through hole (22) aligned with said first through hole (19) of said upper flexible belt (9);
said sixth end (30) being provided with a coupling portion (20) arranged to cross through said first through hole (19) and said second through hole (22) in order to mechanically connect the second end (15) of said upper flexible belt (9) and the third end (16) of said intermediate flexible belt (10) to the sixth end (30) of said spiral spring (13).
Fabric roller blind (1) according to claim 6, characterized in that said coupling portion (20) of said sixth end (30) of said spiral spring (13) comprises:
- a connection section (32) having a second transverse extension (D1) smaller than the first transverse extension (D) and arranged to cross through said first through hole (19) of the second end (15) of said upper flexible belt (9) and said second through hole (22) of the third end (16) of said intermediate flexible belt (10);

- a blocking section (33) provided with two wings (21) defining, with said connection section (32), two undercut recesses (33) arranged to block the sixth end (30) of said spiral spring (13) against the second end (15) defining said first through hole (19) and against the third end (16) defining said second through hole (22).
Fabric roller blind (1) according to claim 5, characterized in that said pin (26) of said cover casing (27) is provided with a groove (34) in which the fifth end (29) of said spiral spring (13) is inserted.
Fabric roller blind (1) according to any one of the preceding claims, characterized in that said lateral upright (3) comprises connection means (35) arranged at a head portion (36) of said lateral upright (3) adapted to mechanically connect the first end (14) of said upper flexible belt (9) to the lateral upright (3).
Fabric roller blind (1) according to claim 9, characterized in that the first end (14) of said upper flexible belt (9) is provided with a third through hole (38) and in that said connection means (35) of said lateral upright (3) comprise a tooth (37) fixed to said lateral upright (3) and extended along an axis substantially parallel to the rotation axis (X) of said take-up roller (4) and inserted within said third through hole (38) of the first end (14) of said upper flexible belt (9).