ITUA20164083A1 - Double roller blind assembly. - Google Patents

Description

DOUBLE ROLLER ROLLING BLIND ASSEMBLY

The present invention relates to a double roller blind assembly.

More precisely, the present invention relates to the winding / unwinding mechanism of double roller blinds comprising two fabrics of different densities.

This type of awning is used as it allows you to vary, with a single roller shutter mechanism, the darkening capacity of the awning fabric according to your needs.

These blinds have a first lower roller and a second upper roller, each roller being fixed respectively to the lower and upper parts of an opening, such as a window. Two fabrics of a material of different density are coupled together in an integral way and are made to slide on said two rollers in such a way that by winding and unwinding the rollers, the fabrics are made to slide, to shield the opening with one of the two fabrics , depending on the intensity of the light to be shielded.

A problem with this type of curtain lies in the fact that since both rollers are fixed to the window, it is never possible to free the window compartment from the fabric.

The object of the present invention is to overcome the drawbacks of the known art described.

The object of the present invention is a roller blind assembly for shielding an area, said area comprising at least one edge, said assembly comprising a first fixed driving roller and a second driven roller movable with respect to said first roller, and a blind having two ends, each end of said curtain being respectively coupled to a respective roller, said curtain being able to slide between said first roller and said second roller in such a way as to be able to be almost totally wound on one or both of said rollers, said assembly further comprising means actuation means acting on said first roller to exert a winding / unwinding torque on said curtain to wind / unwind said curtain on said first roller, and return means acting on said second roller capable of exerting a return torque on said curtain for winding it onto said second roller, wherein said assembly is configured in such a way that, during u when said first roller is fixedly coupled to an edge of said area, and a removal force acts on said second roller to move said second roller away from said first roller, said assembly is able to pass between an unused position , in which said curtain is almost completely wound on said first roller and said second roller is arranged in proximity to said first roller in such a way as to leave said area free, and a position of use, in which said curtain screens said area, and in wherein said removal force and said return means are configured in such a way that: when said assembly is not in said position of use, the removal force acting on said second roller is greater than or equal to the forces resulting from said return torque so as to prevent the sliding of said curtain on said second roller; and when said assembly is in said position of use, said removal force is lower than the forces resulting from said return torque, so as to allow said curtain to slide on said second roller upon action of said actuation means.

In particular, according to the invention, said opening can comprise an upper edge and a lower edge, said assembly can be configured in such a way that, when said first roller is fixedly coupled to the upper edge of an opening, said assembly is able to pass between said position of non-use, and said position of use, in which said second roller rests on said lower edge of said opening, and the mass of said second roller and said return means can be configured in such a way that, when said assembly is not in said position of use, said weight force acting on said second roller is greater than or equal to the forces resulting from said return torque so as to prevent the sliding of said curtain on said second roller; and when said assembly is in said position of use, said weight force is lower than the forces resulting from said return torque, so as to allow said curtain to slide on said second roller upon action of said actuation means.

Still according to the invention, said return means can be a coaxial spring to said second roller, in particular a mechanical, air or gas spring, or said return means are motorized return means.

Further according to the invention, said second roller can comprise a counterweight capable of contributing to its mass, said counterweight having a mass based on the size and specific weight of said curtain to be rolled up.

Always according to the invention, said assembly can further comprise coupling means for removably coupling said second roller with said lower edge of said opening and acting with a coupling force on said second roller to keep said second roller coupled to said lower edge in said position of use, said coupling means being configured in such a way that when the actuation means are operated to wind said curtain onto said first roller and said assembly is in said position of use, the coupling force is less than the forces resulting from said winding torque to allow the lifting of said second roller from said lower edge.

Preferably according to the invention, said coupling means can be a pair of ferromagnetic elements exerting a magnetic coupling force on said second roller, in which a first ferromagnetic element is coupled to said second roller and the second ferromagnetic element is coupled to the lower edge of said opening.

Furthermore, according to the invention, said assembly can provide at said second roller a multiplied friction centrifugal deceleration system acting on said return means with a force opposite to the forces resulting from said return torque.

Still according to the invention, said curtain can comprise at least two portions arranged one after the other along the length of said curtain in such a way that by winding / unwinding the two rollers, when said assembly is in the position of use, one of said two portions completely cover said opening or both, partially, completely cover said opening.

Always according to the invention, said at least two portions of curtains can be in different materials and / or they can have a different decoration and / or they can have a different consistency depending on the required darkening or light shielding capacity, and / or they can be filtering and / or attenuating and / or occulting and / or obscuring and / or mosquito net type. In particular, according to the invention, said drive means can be a rope, a continuous chain, a winch or a gearmotor.

Preferably according to the invention, said assembly can provide an external casing with a support and containment function for one or both of said rollers.

Further according to the invention, said assembly can comprise a support element for each end of said second roller, each support element can be constrained in rotation to the respective end of said second roller, said support elements being able to rest on said edge lower than said opening when said assembly, during use, is in said position of use.

Furthermore, according to the invention, each of said support elements can have a substantially triangular shape, in which the apex is constrained in rotation to the respective end of said second roller and the two base ends are suitable, during use, to come into contact with the lower edge of said opening in said position of use.

Still according to the invention, said assembly can comprise at least one lever hinged in one of said ends of said second roller and said counterweight can be coupled to one end of said lever.

Preferably according to the invention, said assembly can comprise a third roller coupled to the second end of said lever and arranged in such a way as to come into contact with said curtain so as to accompany the winding / unwinding of said curtain. Still according to the invention, said assembly can comprise a lateral guide at each side of said first and second rollers, two further secondary rollers having the center of the respective axis misaligned with respect to the center of the axis of the first and second rollers and arranged in such a position as to come into contact with said curtain in such a way as to bring the lateral edges of said curtain housed in said lateral guides.

Further according to the invention, said assembly can comprise extensible articulated arms and further actuation means, said extensible articulated arms having one end coupled to said second roller, said assembly being configured in such a way that, during use when said articulated arms can have the second end fixedly coupled to said at least one edge and act on said second roller with a thrust force caused by said further actuation means which corresponds to said removal force, said curtain is able to pass from said position of non-use at said use position and vice versa, and said thrust force and return means, can be configured in such a way that when the awning is not in said use position, the thrust force is greater than or equal to the resulting forces from the return torque, so as to prevent sliding of the curtain on said second roller, to allow to cover the area to be shielded, and in such a way that when said assembly is in said position of use, the thrust force is lower than the forces resulting from said return torque, so as to allow the sliding of said curtain on said second roller upon action of said actuation means.

Still according to the invention, said area can provide a first side edge and a second side roller, said assembly can provide a third roller comprising further return means configured in such a way as to exert a return force on said second roller when said assembly is in said non-use position corresponding to said removal force, said assembly can be configured in such a way that in said non-used position said actuating means exert a winding torque on said curtain such that the resulting forces are greater than or equal at said return force, and in said position of use, the forces resulting from said return torque is greater than said return force.

Finally, according to the invention, said drive means can be equipped with a first motor or upper motor acting on said first roller and connected to a radio control unit, the second roller can comprise a second lower motor or motor connected to a receiving radio control unit , and may comprise an encoder, capable of detecting the position of the second roller when said assembly is in said position of use in order to act on said first and second motor to allow the winding of said curtain onto said second roller.

The invention will now be described for illustrative but not limitative purposes, with particular reference to the drawings of the attached figures, in which:

Figure 1 shows a sectional side view of the roller blind according to the invention in a first embodiment when it is in the position of use;

figure 2 shows a front view of the roller blind of figure 1;

Figure 3 shows a sectional side view of the roller blind according to the invention in a second embodiment when it is in the position of use;

Figure 4 shows a sectional side view of the roller blind according to the invention in a third embodiment when it is in the position of use;

Figure 5 shows a sectional side view of the roller blind according to the invention in a fourth embodiment when it is in the position of use;

Figure 6 shows a sectional side view of the roller blind according to the invention in a fifth embodiment when it is in the position of use;

Figures 7a and 7b show a detail of Figure 6 in two different positions of use;

Figure 8a shows a front view of the roller blind according to the invention when it is in the non-use position;

figure 8b shows a front view of the roller blind according to the invention when it is in use;

Figure 8c shows a front view of the roller blind according to the invention when it is in the position of use;

Figure 9 shows a front sectional view of a variant of the second roller of the roller blind according to the invention;

Figure 10 shows a side view of the roller blind according to the invention in a sixth embodiment;

Figure 11 shows a side sectional view of a coupling detail between the blind and the roller of the roller blind according to the invention;

Figure 12a shows a sectional side view of a seventh embodiment of the roller blind according to the invention;

figure 12b shows a sectional top view of a portion of the roller blind in figure 12a;

figure 12c shows a front view of a portion of the roller blind of figure 12a;

Figure 13a shows a sectional side view of an eighth embodiment of the roller blind according to the invention;

Figure 13b shows a sectional top view of a portion of the roller awning of Figure 13a;

figure 14 shows a side view of a variant of the roller blind of figure 13a;

Figure 15a shows a side view of a ninth embodiment of the roller blind according to the invention, in the non-use position;

figure 15b shows a side view of the roller blind of figure 15a, in the position of use; Figure 16a shows a top view of a tenth embodiment of the roller blind according to the invention, in the position of use;

figure 16b shows a front view of the roller blind of figure 16a;

Figure 16c shows a top view of the roller blind in figure 16a, in the non-use position;

Figures 17a and 17b show sectional front and side views of an eleventh embodiment of the roller blind according to the invention; And

Figure 18a shows a sectional side view of a further embodiment of the roller blind according to the invention in the non-use position;

Figure 18b shows a sectional side view of the roller blind of Figure 18a in the position of use; And

figure 18c shows a sectional front view of the roller blind of figure 18a.

Referring to figures 1 and 2, we see a first embodiment of the roller blind assembly according to the invention indicated with the numerical reference 1.

In the following, reference will be made to a roller blind 1 capable of shielding the light from openings 12 made in buildings, for example a window or a door. These openings 12 generally have an upper edge 13, a lower edge or threshold 14 and two lateral edges 15 (as shown specifically in Figures 9a - 9c).

The roller blind 1 comprises a first driving roller 2 to be fixed to the upper edge 13 of an opening 12, a second driven roller 3 movable with respect to said first roller 2, and a blind 4, having two ends each coupled to a respective roller 2 and 3, and able to slide between said first roller 2 and said second roller 3 so as to be able to be wound almost completely on one or both of said rollers 2 and 3.

The first fixed roller 2 can be contained or protected by an external casing 5, for example a containment box, as shown in the embodiment of figure 1 or it can be left exposed, as shown in the embodiments of figures 3 and 4 .

The curtain 4 preferably has a width and a length such as to be able to occupy the free surface of the opening or open compartment 12, such as for example a window or a door of a building, and preferably comprises at least two portions 41, 42 arranged one below. to the other along the length of said curtain 4 in such a way that by winding / unwinding the two rollers 2 and 3, one of said two portions 41, 42 completely covers said compartment 12 (as shown in Figures 9b and 9c) or both, in partially, completely cover said compartment 12 (as shown in Figure 2).

These at least two portions 41, 42 of curtain 4 are preferably in two or more different materials and / or can have a different decoration and / or can have a different consistency depending on the required darkening or light shielding capacity. These fabric portions can be of the filtering, attenuating, occulting or obscuring type.

In other embodiments, not shown, three or more curtain portions can be provided and therefore couplings of three or more fabrics of different material and / or consistency.

The roller blind 1 according to the invention also comprises actuation means 9 acting on said first roller 2 on said curtain 4 with a first winding twisting moment M2- or a first unwinding twisting moment M2 + to wind or unwind said blind 4 around said first roller 2, and return means 11 acting on said second roller 3 with a return torque M3 + acting on said curtain 4 to wind said curtain 4 around said second roller 2.

The roller blind 1 is able to switch between a position of non-use, in which the blind 4 is almost completely wound on the first roller 2 and the second roller 3 is arranged in proximity to the first roller 2 in such a way as to leave the opening 12 free, and a position of use, in which the curtain 4 screens the opening 12 and the second roller 3 is coupled to the lower edge 14 of the opening 12, and vice versa.

The mass of the second roller 3 and the return means 11 are configured in such a way that when the second roller 2 is not resting on the lower edge 14 of the opening 12, in other words when the roller blind 1 is not in the position of use, the weight force Fpagent on the second roller 3 is equal to or greater than the forces resulting from said return torque M3 + in such a way as to prevent the sliding (winding or unwinding) of the curtain 4 on the second roller 3, and in such a way that when the second roller 3 rests on the lower edge 14 of the opening 12, in other words when the roller blind 1 is in the position of use, the weight force F that acts on the second roller 3 is less than the resulting forces of said return torque M3 + so to allow said curtain 4 to slide (roll up or unwind) on said second roller 3 on command of the actuation means 9.

In fact, when the second roller 3 rests on said lower edge 14, the weight force Fpsi cancels counterbalanced by the resulting force exerted by the supporting surface, the lower edge 14, on the second roller 3.

The actuation means 9 of the first roller 3 can be a rope, a continuous chain, a winch or a gearmotor.

In the embodiments of figures 1 - 3, the return means 11 acting on said second roller 3 are a mechanical spring coaxial to the second roller 3 having a winding torque M3 + acting on said second roller 3. However, in other forms of embodiment said return means 11 can be an air spring, gas spring, or motor return means.

The second mobile roller 3 can have a metal profile 6 with the function of supporting and containing the curtain 4 when wound on said second roller 3. Therefore, when the curtain 4 is almost completely wound on the first roller 2, the second mobile roller 3 is raised, so as to leave free the volume of the compartment of the opening 12, for example of a glazed window.

In this position the coaxial spring 11 to the second roller 3 will be loaded due to the overall weight of the second roller 3.

However, this spring 11 will be free to return to the rest position as soon as the torsional effort generated by the unwinding of the curtain 4 ceases.

As shown in figures 8a - 8c, by activating the first roller 2 by means of the control means 9 so as to unwind the curtain 4 from the first roller 2, the second roller 3 will descend towards the lower part of the compartment 12, dragging the first portion 41 of fabric of the awning 4, so as to cover all the light of the compartment of the opening 12 to be shielded, until the second roller 3 lies in correspondence with the lower part or lower edge 14 of the compartment 12 (figure 8b), especially the sill of a window or the floor of a door.

When you want to further attenuate the light intensity passing through the opening 12, the second portion 42 of the curtain 4 will be lowered while continuing to act on the first roller 2 by means of the control means 9.

The winding torque M3 + existing in the spring 11 will act on the second roller 3, wrapping the first portion 41 of the awning 4 around the second roller 3. When it is desired to obtain complete darkening of the opening 12, the second portion will continue to unwind 42 of curtain 4 from the first roller 2, while the first portion 41 of curtain 4 will wind again on the second roller 3.

At the end of the unwinding of the second portion 42 of the curtain 4, equal to the height of the compartment 12 to be shielded, the first portion 41 of the curtain 4 will be completely wrapped around the second roller 3 while the second portion 42 of the curtain 4 will cover the entire freed glass surface. from the previous portion 41 of curtain 4 (as shown in figure 8c).

It is also possible to have intermediate mixed positions of the two portions 41, 42 of the curtain 4 simultaneously on the window 12 simply by adjusting the upward or downward winding of the curtain on the rollers 2 and 3 as desired (as shown in Figure 2).

Inversely, to free the window 12 it will be necessary to act by means of the control means 9 on the first roller or upper roller 2 in such a way as to wind all the portions 41 and 42 of the blind on the first roller 2 also bringing the second roller 3 completely upwards. , freeing the window compartment 12 (as shown in figure 8a).

In this position the spring 11 will still be automatically pre-loaded.

The automatic maneuvering of the lower roller can also take place when the upper roller is motorized, by means of a motor controlled by radio pulses with power supply via wire incorporated in the fabrics or by means of electromagnetic waves according to the new technologies now in development.

Alternatively, as shown in Figures 18a - 18c, the upper roller 2 driving can be equipped with a first motor or upper motor 28 connected to a radio control unit 30. The upper motor 28 controls the descent of the lower roller 3. The second roller or roller also lower 3 is equipped with a second or lower motor 29 connected to a radio receiver 31.

By means of an encoder, in particular a radian reader, the position of the second roller 3 is detected when it reaches the lower edge 14 of the opening 12. At that point, continuing the maneuver, it starts at the same time as a radio pulse the lower motor 31 which will roll up the lower fabric of the awning 4 while the upper fabric descends.

The encoder will also read the arrival of the upper fabric at the threshold 14 and with a radio pulse it will stop the lower motor 31 at the same time as the upper motor 30.

Same philosophy for varying the two fabrics 41, 42 uphill. After rolling up the lower fabric and stopping the lower roller 3, the upper motor 30 will lift the lower roller 3 upwards, allowing the batteries 32 contained in the lower roller to be recharged, suitable for charging the lower motor 31.

Therefore in this case the removal force is given primarily by the battery-powered motor located in the lower roller.

The embodiment of the roller blind 1 according to the invention of Figure 4 differs from the embodiments described above in that it does not provide containment or covering elements for the rollers 2 and 3. Furthermore, it provides that the actuation means 9 is a motor acting on said first roller 2 and that the second roller 3 is equipped with a counterweight 7 capable of contributing to the mass of the second roller 3.

The mass of the counterweight 7 or of the second roller 3 is variable according to the size of the curtain 4 to be wound, the number of fabrics used for the curtain and their specific weight.

Figure 5 shows a further embodiment of the roller blind 1 according to the invention, which differs from the previous ones in that it further comprises coupling means for removably coupling said second roller 3 to said lower edge 14 of said opening 12 and able to exert a FC coupling force.

In the particular embodiment said coupling means are a pair of magnetic elements 8 and 10 exerting a magnetic force FC on said second roller 3, and can be a magnet and a ferromagnetic element or two magnets with different polarity.

A first magnetic element 8 is coupled to the second roller 3 and the second magnetic element 10 is fixed to the lower edge 14 of the compartment 12 to be shielded, for example the threshold of a window.

Therefore, when the second roller 3 is arranged in proximity to the lower edge 14 of the compartment 12, the second roller 3 is pushed by the magnetic force FC in coupling to the lower edge 14, advantageously preventing the second roller 3 from moving from its resting position. .

The magnetic force FC exerted by the pair of magnetic elements 8, 10 is in any case less than the possible resultant force exerted by the winding torque M2- acting on said curtain 4 by means of said actuation means 9 to wind said curtain 4 on said first roller 2 and at the same time to unwind it from said second roller 3, thus allowing the second roller 3 to be lifted from the threshold 14.

Figures 6 and 7a and 7b show a further embodiment of the roller blind 1 according to the invention, comprising magnetic coupling means like the previous embodiment.

The second roller 2 and the lower edge 14 of the compartment 12 are shaped in such a way as to allow the second roller 3 to slide diagonally with respect to the threshold 14.

In particular, the lower portion 17 of the second roller 3 has a wedge-shaped shape. The coupling means in the present embodiment are two pairs of magnetic elements 8, 10 and 18, 19, in which the first pair of magnetic elements 8, 10 has a greater magnetic power than the other 18, 19 and in which each element magnetic element 8 or 18 present on the second roller 3 can be combined with each magnetic element 10 or 19 present on the lower edge 14 of the opening 12 to exert the magnetic force FC on the second roller 3. When the second roller 3 descends towards the threshold 14 la l ' magnetic element 8 having a greater power than the second roller 3 is attracted by the magnetic element 10 having a greater power than the lower edge 14, creating an alignment between the first roller 2 and the second roller 3, as shown in Figures 6 and 7a - 7b.

In this position the awning 4 will be free to slide on the second roller 3.

When it is desired to free the compartment of the window 12, by acting on the control means 9, the magnetic element 8 of greater power of the second roller 3 will detach from its counterpart 10 of the lower edge 14 and will couple to the second magnetic element 19 of lesser power. , repositioning the two rollers 2 and 3 on the same axis, and then detaching definitively. This will avoid abrupt detachment movements between the second roller 3 and the lower edge 14 of the compartment 12, as could happen in the embodiment described above.

Each of the embodiments described above in which an anchoring / fixing of the second roller 3 is provided to the lower edge 14 of the opening 12, have the problem that when the second roller 3 is uncoupled from the threshold 14 due to the force exerted by the actuation means 9 for winding the curtain 4 onto the first roller 2, the second roller 3 can make a violent upward movement.

To solve this problem, as shown in Figure 9, the second roller 3 can provide a centrifugal deceleration system 16 with multiplied friction acting on the return means 11, in particular on the spring 11, in such a way as to decelerate the reaction of the spring 11 when the second roller 3 is decoupled from the lower edge 14. In particular, to avoid that, when, during use, said second roller 3 is decoupled from said lower edge 14 of said opening 12, the winding force acting on said curtain 4 is too intense such as to cause a violent winding of the awning towards the first roller 2. Said centrifugal deceleration system 16 is particularly useful when there is not a sufficient weight on the lower roller 3 to counteract the moment of the spring 11.

In consideration of the continuous variation of the return torque M3 + of the return means 11, in particular of the preloaded spring 11, even if the greater weight is placed on the unwinding side of the curtain 4 in correspondence with the second roller 3, this will have a continuous rotary movement .

In order to ensure a secure support of the lower roller 3 at all times, two lateral support elements 24, in particular movable lateral feet 24, rotating by gravity, can be provided on the lateral heads of the second roller 3.

In fact, a support element 24 can be provided for each end of said second roller 3. Each support element 24 is constrained in rotation to the respective end of said second roller 3, and is able to come into contact with the lower edge 14 of the opening 12 when said assembly, during use, is in said position of use.

As shown in the embodiment of Figure 10, each of said support elements 24 can preferably have a substantially triangular shape, in which the apex is constrained in rotation to the respective end of said second roller 3 and the two base ends are adapted to , during use, to come into contact with the lower edge 14 of said opening 12 in said position of use, to give greater stability to the second roller 3.

As previously described, in order to contribute to the mass of said second roller 3, a counterweight 7 can be provided. In the embodiment of Figure 10, a lever 25 can be provided, hinged in one of said ends of said second roller 3 and said counterweight 7 is coupled to one end of said lever 25, free to rotate with respect to the constraint point, without interfering with the support of the support element 24 on the lower edge 14 of the opening 12. According to the diameter of the counterweight 7 and due to the characteristics of the spring 11, their distance with respect to the center of gravity, or constraint center of the lever, and the mass of the counterweight 7 can vary.

In order to oppose the rotation of the counterweight 7, a third roller 26 can be provided, coupled to the second end of the lever 25, and arranged above the second roller 3, in a position opposite to the direction of unwinding of the curtain 4. Said third roller 26 is arranged in a so as to come into contact with said curtain 4 so as to accompany the winding / unwinding of the curtain 4.

To ensure optimal operation of the assembly according to the invention, it would be advisable for the lower end of the curtain 4, in correspondence with the second roller 3, to unwind completely, so as to allow the lower roller 3 to rise, to prevent sliding. of the roller 3 with respect to the fabric of the curtain 4. It is therefore preferable that this lower end of the curtain 4 is solidly coupled to the second roller 3, as shown in the variant of figure 11, in which the lower end of the curtain 4 is shaped like a pocket suitable to house said second roller 3. Furthermore, a portion of said pocket is rigidly coupled to said second roller 3. For example, said second roller 3 can have a seat 27 suitable for housing a portion of said pocket and the assembly 1 can providing a locking element 28, for example a rubber, of a shape suitable for inserting into said seat 27 to lock said pocket in position. Alternatively, said pocket can be coupled to said second roller 3 by means of a fixing rivet.

Contrary to a traditional blackout system where the fabric is tensioned by a flat lower profile, in the embodiments shown in figures 12 - 14, the roller blind 1 according to the invention, in the blackout version, provides that the rollers 2 and 3 are contained in a respective containment element 5 and 6 of considerable size, lateral guides 29 are also provided which are able to partially cover the lateral edges of the awning 4, to prevent the external light from passing from said opening 12 towards the interior of the environment where the curtain is placed 1.

To simplify the assembly 1, a single-wall guide 29 equipped with a light sealing brush will be used on which the fabric of the curtain 4 will adhere continuously, induced in said guide 29 by two rollers, one upper 30 and one lower 31 , which affect the variation in diameter of the control rollers 2 and 3.

In other words, the assembly 1 according to the invention, in the darkening version, can comprise a lateral guide 29 in correspondence with each side of said rollers 2 and 3, two further secondary rollers 30 and 31 having the center of the respective axis misaligned with respect to at the center of the axis of the main rollers 2 and 3 and arranged in such a position as to come into contact with said curtain 4 in such a way as to bring the edges of said curtain 4 into said lateral guides 29 to obscure the light that could possibly pass laterally from said opening 12.

The embodiments of figures 12 and 13 vary in the configuration of the containment element 6 of the second roller 3. In the embodiment of figure 14, the support element 24 coupled to the second roller 3 is also provided.

The containment element 6 or box has the conformation with greater weight towards the side where it must contrast the moment of the return spring and has the possibility of varying this weight with the addition of heavy metal profiles.

The same principle can be applied to obtain a roll-up curtain in which the curtain 4 has a first portion 41 in mosquito net fabric and the second portion 42 in fabric that obscures or filters in sunlight, as shown in figures 17a and 17b. Contrary to the use often by means of a spring, this type must necessarily have the maneuver from the upper axis by means of a rope, chain, winch, motor.

Referring to figures 15a and 15b, a different embodiment of the roller blind according to the invention is observed, always indicated with the numerical reference 1.

In the present embodiment, the roller awning 1 is of the type with extendable articulated arms 32, for covering and protecting an area to be covered, such as a terrace, a patio or an external portion of a garden.

Also in this case the curtain 1 provides two rollers 2 and 3 and a curtain 4 capable of winding / unwinding between said rollers 2 and 3. In this embodiment, the removal force acting on said second roller 3 to move it away from said first roller 2, to bring the awning from the position of non-use (figure 15a) to the position of use (figure 15b), is exerted by said articulated arms 32 which exert a thrust force Fss on said second roller 3. The thrust force Fs is caused by further actuation means, mechanical or motorized, acting on said arms 32 in opening / closing.

Therefore, said thrust force Fs and the return means 11, in particular the spring 11 acting on the curtain 4 in said second roller 3, are configured in such a way that when the curtain 1 is not in said position of use, the thrust force The agent on said second roller 3 is greater than or equal to the forces resulting from the return torque M3 + of the return means 11 so as to prevent the curtain 4 from sliding on said second roller 3, to allow the area to be shielded to be covered, and in such a way that when said assembly 1 is in said position of use, the thrust force Fsagente on said second roller 3 is lower than the forces resulting from said return torque M3 +, so as to allow the sliding of said curtain 4 on said second roller 3 upon action of said actuation means 9.

In the case in question, the position of use does not necessarily correspond to the total opening of the arms 32, but also the partial opening of the arms 32 to cover a smaller area.

The solution according to the present embodiment advantageously allows to have different fabrics for the tent 4, for example one of the permeable filtering type for the summer season and one waterproofed for the winter season.

In the specific case, therefore, the action of the mass of the second roller in the embodiment of figures 1 - 9 in contrast to the spring is replaced by the thrust force from the expandable and rigid arms.

Still the solution according to the present invention can also be applied to roller blinds for skylights, as shown for the embodiment of figures 16a - 16c.

In the present embodiment, the roller blind 2 comprises in addition to the two rollers 2 and 3, a third roller 33, said rollers 2, 3 and 33 have their axes parallel and arranged transversely to the opening / closing direction of the awning 4 for covering an opening 12 of a skylight.

The first fixed driving roller 2 is driven by drive means 9, such as a chain, winch or motor. The second movable roller 3, driven by the first roller 2, provides for return means, in particular a spring 11. The curtain 4 is wound and runs in winding / unwinding on the two rollers 2 and 3. The function of the pulling force between the two rollers 2 and 3 is unwound in this case by a third roller 33 comprising further return means 34, in particular a spring, configured in such a way as to exert a return force Fr on said second roller 3 when said assembly 1 is in said position of I do not use. The spring 34 is loaded to the maximum when the curtain 4 is completely wound on the first roller 2, drawing the second roller 3 towards it by exerting said return force Fr.

In the non-use position, the actuation means 9 exert a winding torque M2- on said curtain 4 such as to be higher than said return force Fr so that only when the curtain 4 is unwound the second roller 2 is recalled towards the third roller 3.

In the position of use, i.e. when the second roller 3 is near the third roller 33, the return means 11 of the second roller 3 are fully loaded so that the return torque M3 + is higher than the return torque M33 + of the means for returning the third roller 33.

Variant: axis 2 has a limit switch that allows it to start and load axis 3.

The operation of this variant, instead of playing between the difference in moment M3 <M33, acts by block: when the first roller 2 has completely wrapped the first portion of fabric 41 on the second roller 3, a limit switch intervenes which blocks the rotation of the axis, therefore the second roller 3 is forced to follow the fabric towards the first roller 2, while loading the third roller 33.

The principle according to the present invention can conveniently be applied to other types of roller blinds, such as, for example, vertical and horizontal interior blinds, mosquito nets, drop or arm awnings.

The roller blind 1 according to the invention advantageously allows to use a single blind with different characteristics.

In addition, with a single mechanism, it allows you to completely free the window compartment when the curtain is not needed.

Furthermore, it advantageously allows to reduce the overall dimensions necessary for the installation of filtering / blackout curtains in combination.

In the foregoing, the preferred embodiments have been described and variants of the present invention have been suggested, but it is to be understood that those skilled in the art will be able to make modifications and changes without thereby departing from the relative scope of protection, as defined by the claims attached.

Claims (19)

CLAIMS 1. Assembly (1) of roller blind (4) for shielding an area (12), said area (12) comprising at least one edge (13), said assembly (1) comprising a first fixed driving roller (2) and a second driven roller (3) movable with respect to said first roller (2), and a curtain (4) having two ends, each end of said curtain (4) being respectively coupled to a respective roller (2, 3), said curtain ( 4) being able to slide between said first roller (2) and said second roller (3) in such a way as to be able to be almost totally wound on one or both of said rollers (2, 3), said assembly (1) further comprising actuation means (9) acting on said first roller (2) to exert a winding / unwinding torque (M2-, M2 +) on said curtain (4) to wind / unwind said curtain (4) on said first roller (2 ), and return means (11) acting on said second roller (3) capable of exerting a return torque (M3 +) on said curtain (4) to wind la on said second roller (3), wherein said assembly (1) is configured in such a way that, during use when said first roller (2) is fixedly coupled to an edge (13) of said area (12 ), and a removal force (Fp; Fs; Fr) acts on said second roller (3) to move said second roller (3) away from said first roller (2), said assembly (1) is able to pass between a position of non-use, in which said curtain (4) is almost completely wound on said first roller (2) and said second roller (3) is arranged in proximity to said first roller (2) in such a way as to leave said area (12) free, and a position of use, in which said curtain (4) screens said area (12), and in which said removal force (Fp; Fs; Fr) and said return means (11) are configured in such a way that: when said assembly (1) is not in said position of use, the removal force (Fp; Fs; Fr) acting on said second roller (3) is greater than or equal to the forces resulting from said return torque (M3 +) so as to prevent the sliding of said curtain (4 ) on said second roller (3); and when said assembly (1) is in said position of use, said removal force (Fp; Fs; Fr) is lower than the forces resulting from said return torque (M3 +), so as to allow the sliding of said curtain ( 4) on said second roller (3) upon action of said actuation means (9). Assembly (1) according to the preceding claim, characterized in that said opening (12) comprises an upper edge (13) and a lower edge (14), in that said assembly (1) is configured in such a way that, when said first roller (2) is fixedly coupled to the upper edge (13) of an opening (12), said assembly (1) is able to pass between said position of non-use, and said position of use, in wherein said second roller (3) rests on said lower edge (14) of said opening (12), and in that the mass of said second roller (3) and said return means (11) are configured in such a way that , when said assembly (1) is not in said position of use, said weight force (Fp) acting on said second roller (3) is greater than or equal to the forces resulting from said return torque (M3 +) so as to prevent the sliding of said curtain (4) on said second roller (3); and when said assembly (1) is in said position of use, said weight force (Fp) is lower than the forces resulting from said return torque (M3 +), so as to allow the sliding of said curtain (4) on said second roller (3) upon action of said actuation means (9). 3. Assembly (1) according to the preceding claim, characterized in that said return means (11) are a spring coaxial to said second roller (3), in particular a mechanical, air or gas spring, or said return means they are motorized return means. 4. Assembly (1) according to any one of the preceding claims, characterized in that said second roller (3) comprises a counterweight (7) capable of contributing to its mass, said counterweight (7) having a mass based on the size and to the specific weight of said curtain (4) to be rolled up. 5. Assembly (1) according to any one of the preceding claims, characterized in that it further comprises coupling means (8, 10; 18, 19;) for removably coupling said second roller (3) with said lower edge (14) of said opening (12) and acting with a coupling force (FC) on said second roller (3) to keep said second roller (3) coupled to said lower edge (14) in said position of use, said coupling means (8, 10; 18, 19;) being configured in such a way that when the actuation means (9) are operated to wind said curtain (4) onto said first roller (2) and said assembly (1) is in said position of use, the coupling force (FC) is less than the forces resulting from said winding torque (M2-) to allow the lifting of said second roller (3) from said lower edge (14). 6. Assembly (1) according to the preceding claim, characterized in that said coupling means are a pair of ferromagnetic elements (8, 10; 18, 19) exerting a magnetic coupling force (FC) on said second roller (3) , in which a first ferromagnetic element (8; 18) is coupled to said second roller (3) and the second ferromagnetic element (10; 19) is coupled to the lower edge (14) of said opening (12). 7. Assembly (1) according to any one of the preceding claims, characterized in that it provides in correspondence with said second roller (3) a multiplied friction centrifugal deceleration system (16) acting on said return means (11) with a force opposite to the forces resulting from said recall torque (M3 +). 8. Assembly (1) according to any one of the preceding claims, characterized in that said curtain (4) comprises at least two portions (41, 42) arranged one after the other along the length of said curtain (4) in such a way that by winding / unwinding the two rollers (2 and 3), when said assembly (1) is in the position of use, one of said two portions (41, 42) completely covers said opening (12) or both, partially, cover completely said opening (12). 9. Assembly (1) according to the preceding claim, characterized in that said at least two portions (41, 42) of curtain (4) are made of different materials and / or have a different decoration and / or have a different consistency depending on the ability to obscure or shield the light required, and / or are of the filtering and / or attenuating and / or occulting and / or obscuring and / or mosquito net type. 10. Assembly (1) according to any one of the preceding claims, characterized in that said actuation means (9) are a rope, a continuous chain, a winch or a gearmotor. 11. Assembly (1) according to any one of the preceding claims, characterized in that it provides an external casing (5, 6) with the function of supporting and containing for one or both of said rollers (2, 3). Assembly (1) according to any one of the preceding claims, characterized in that it comprises a support element (24) for each end of said second roller (3), in that each support element (24) is constrained in rotation at the respective end of said second roller (3), said support elements (24) being able to rest on said lower edge (14) of said opening (12) when said assembly (1), during use, is in said position of use. Assembly (1) according to the preceding claim, characterized in that each of said support elements (24) has a substantially triangular shape, in which the apex is constrained in rotation to the respective end of said second roller (3) and the two base ends are able, during use, to come into contact with the lower edge (14) of said opening (12) in said position of use. 14. Assembly (1) according to claim 12 or 13, when dependent on claim 4, characterized in that it comprises at least one lever (25) hinged in one of said ends of said second roller (3) and in that said counterweight ( 7) is coupled to one end of said lever (25). 15. Assembly (1) according to the preceding claim, characterized in that it comprises a third roller (26) coupled to the second end of said lever (25) and arranged in such a way as to come into contact with said curtain (4) so as to accompany the winding / unwinding of said curtain (4). 16. Assembly (1) according to any one of the preceding claims, characterized in that it comprises a lateral guide (29) at each side of said first and second rollers (2, 3), two further secondary rollers (30, 31) having the center of the respective axis misaligned with respect to the center of the axis of the first and second rollers (2, 3) and arranged in such a position as to come into contact with said curtain (4) in such a way as to bring the lateral edges of said curtain (4) housed in said lateral guides (29). 17. Assembly (1) according to claim 1, characterized in that it comprises extensible articulated arms (32) and further actuation means, said extensible articulated arms (32) having one end coupled to said second roller (3), said assembly (1) being configured in such a way that, during use when said articulated arms (32) have the second end fixedly coupled to said at least one edge (3) and act on said second roller (3) with a force of thrust (Fs) caused by said further actuation means which corresponds to said removal force, said curtain is able to pass from said position of non-use to said position of use and vice versa, and by the fact that said thrust force (Fs ) and the return means (11), are configured in such a way that when the curtain (1) is not in said position of use, the thrust force (Fs) is greater than or equal to the forces resulting from the return torque (M3 + ), in mod or to prevent the sliding of the curtain (4) on said second roller (3), to allow the covering of the area to be shielded, and in such a way that when said assembly (1) is in said position of use, the thrust force (Fs) is lower than the forces resulting from said return torque (M3 +), so as to allow the sliding of said curtain (4) on said second roller (3) upon action of said actuation means (9). 18. Assembly (1) according to any one of the preceding claims, characterized in that said area (12) provides a first lateral edge (13) and a second lateral roller (14), in that it provides a third roller (33) comprising further return means (34) configured in such a way as to exert a return force (Fr) on said second roller (3) when said assembly (1) is in said non-use position corresponding to said removal force, by the fact of be configured in such a way that in said non-use position said actuation means (9) exert a winding torque (M2-) on said curtain (4) such that the resulting forces are greater than or equal to said return force ( Fr), and in said position of use, the forces resulting from said return torque (M3 +) is greater than said return force (Fr). 19. Assembly (1) according to any one of the preceding claims, characterized in that said actuation means (9) are equipped with a first motor or upper motor (28) acting on said first roller (2) and connected to a radio control unit (30), by the fact that the second roller (3) comprises a second motor or lower motor (29) connected to a receiving radio control unit (31), and by the fact that it comprises an encoder, capable of detecting the position of the second roller (3) when said assembly (1) is in said position of use in order to act on said first (28) and second motor (29) to allow the winding of said curtain (4) on said second roller (3).