ES2726931T3 - Fabric roller blind - Google Patents

Abstract

Fabric roller blind (1), comprising: - a support structure (2) intended to be fixed to a load bearing element in which an opening (A) is made; - a pick-up roller (4) rotatably restricted to said support structure (2), which has a substantially horizontal axis of rotation (X), and intended to be located above said opening (A); - two lateral guides (7) extending parallel to each other and side by side along respective first extension directions (Y) substantially orthogonal to the axis of rotation (X) of said pickup roller (4), and intended to be fixed to said load bearing element along the respective sides of said opening (A); - a fabric (5) extending between an upper edge thereof fixed to said pickup roller (4) and a lower edge thereof, and capable of sliding between said lateral guides (7); - a lower bar (6), to which the lower edge of said fabric (5) is fixed and extending, along a second direction of extension (Z), parallel to the axis of rotation (X) of said pick-up roller (4), between its two lateral ends (14) slidably coupled to the corresponding lateral guides (7); - movement means mechanically connected to said collection roller (4) and adapted to rotate said collection roller (4) to move said fabric (5) between a retracted position, in which said fabric (5) is wound around said roller of collection (4), and an extended position, in which said fabric (5) is unwound at least partially from said collection roller (4) extended between said lateral guides (7) to cover at least part of said opening (TO); - at least one guide body (13), which is mechanically associated with a lateral end (14) of said lower bar (6) and is provided with a shaped track (15), intercepted by at least one blocking element ( 16) and provided with at least one inlet opening (15A) and at least one outlet opening (15B); - at least one oscillating rotor (17), located at the lower end of at least one of said lateral guides (7), is provided with a sliding element (17A) capable of sliding in a guided manner within the shaped track ( 15) of the guide body (13) of the side end (14) of said lower bar (6) for engaging and disengaging from said locking element (16) and, consequently, retaining and releasing said lower bar (6); said blind (1) being characterized by the fact that said shaped track (15) is provided with one or more steps (19) that descend in the direction of travel (V) from said inlet opening (15A) to said opening of output (15B) and in which the sliding element (17A) of said oscillating rotor (17) is capable of sliding in the lower part of said shaped track (15) in said direction of travel (V), overcoming said one or more steps (19) during the descent.

Description

DESCRIPTION

Fabric roller blind

Scope

The present invention relates to a fabric roller blind according to the preamble of independent claim number 1.

The present fabric roller blind is advantageously used to close openings in building walls, in particular windows, doors, windows, skylights and similar doors / windows / shutters.

The blind, object of the present invention, therefore belongs to the industrial field of the production of doors / windows / shutters, or also to the field of sunscreen fabrics production, in the field of mosquito nets or for similar applications.

Background

In the market there are known blinds to close the openings of doors / windows / shutters (such as windows, doors or windows) that have a roller shutter box that is fixed to a wall of a building or to a roof over the opening to be closed and it houses a roller inside in which a flexible fabric is susceptible to winding and unwinding.

The fabric generally has a rectangular shape and has an upper edge fixed to the roller and a lower edge fixed to a lower bar intended to pull the fabric itself.

In addition, the blind comprises two lateral guides arranged vertically along the corresponding sides of the opening, to which the lower bar is slidably restricted.

In particular, the lower bar comprises an aluminum section closed at the lateral ends by two lateral ends slidably coupled to the respective lateral guides.

Each lateral guide is obtained from a corresponding aluminum profile of rectangular section, internally hollow and having an internal side (opposite the internal side of the other lateral guide) on which there is formed a longitudinal groove in which it is inserted from Sliding way the corresponding side end of the bottom bar.

In addition, each lateral guide extends longitudinally between an upper end, fixed to the roller shutter box, and a lower end closed by a base end fixed to the ground at the lower edge of the opening. In operation, the roller of the blind can be driven, typically by a motor, to rotate and move the fabric between a collected position, in which the fabric is wound around the roller with the lower bar arranged in contact against the blind box roller, and an extended position, in which the fabric is unwound from the roller to close the opening and the bottom bar is arranged at the ends of the base placed at the lower ends of the side guides.

In particular, blinds are known in the market that have a locking mechanism adapted to automatically lock the bottom bar at the ends of the base when the fabric is placed in the extended position, and release the bottom bar from the ends of the base when it is necessary to rewind the fabric around the roller to place the fabric in the collected position.

In patent application EP 2631388 an example of a blind of known type is provided, provided with a locking mechanism of the lower bar.

According to said patent, the lower bar is fixed to the lower edge of the fabric and extends between two lateral ends thereof slidingly coupled to the corresponding lateral guides. The lateral ends are slidably restricted to the corresponding lateral guide and, in turn, are provided with a shaped guide. An elastically oscillating rotor is mounted on each of the base terminals of the corresponding lateral guides and is provided with a sliding element which, when the fabric is located in the extended position, is inserted into the shaped guide of the sliding element of the bottom bar to retain the fabric in the extended position. The shaped guide has a track that allows the oscillating rotor block the rise of the bar after a first descent of the latter and, consequently, release it in a second descent.

More in detail, in operation, when the fabric is disposed from the collected position to the extended position, the lower bar descends to the base terminals of the lateral guides and each oscillating rotor is inserted with its sliding element in the guide track conformed to a stop.

When the bar is released, the sliding element remains coupled to a locking wing of the shaped guide, blocking the rise of the lower bar.

To release the bottom bar from the base terminals, the same bar is actuated to rise, overcoming the resistance of the locking wing that is suitably mounted in an elastically flexible manner.

The roller blind of known type fabric described above has proven in practice that it is not without drawbacks. A drawback lies in the presence of an elastically flexible element that, over time, can break or bend, reducing its retention and, therefore, in the end can allow the lower bar to accidentally disengage, for example, after a burst of wind.

Also known are fabric roller blinds of a mosquito net, for example, of US Patent 6591889, said blinds comprising the general characteristics described above, which allow the conformed guide to be associated with the track associated no longer with the lower bar terminals, but to the base terminal and, instead, associate a horizontally sliding bar to the side terminal of the lower bar, along which it can slide several millimeters.

Also in this case, in operation, when the fabric is disposed of the position collected to the extended position, the lower bar descends to the base terminals of the lateral guides and each sliding bar is inserted with a sliding element thereof in the guide track shaped up to a stop.

When the bar is released, the sliding element of the bar remains coupled to a locking element of the shaped guide located to intercept the track to block the rise of the lower bar.

To release the lower bar from the base terminals, the same bar is operated to descend several centimeters, which allows the track to move the sliding element of the bar out of most of the blocking element, so that, during the Subsequent ascent, the sliding element can exit an exit opening of the track to release the lower bar and allow the fabric to wind up.

This known type of fabric roller blind also has several drawbacks.

A first drawback arises from the fact that the horizontally sliding slide bar moves several millimeters during the coupling and uncoupling stages with respect to the blocking element.

The friction of the bar when sliding should be low enough to allow horizontal sliding without blocking the vertical sliding of the lower bar. On the other hand, the friction itself should not be too low; otherwise, very small collisions in the approximation stages of the blocking element can break the coupling with the same blocking element, the sliding element being arranged directly towards the exit opening of the track. Finally, a third drawback in the roller blinds of known type of fabric described above lies in the excessive length of the vertical path that the lower bar must complete to allow the sliding element to travel along the track in the coupling and uncoupling stages with respect to the blocking element.

Presentation of the invention

In this situation, the underlying problem in the present invention is to provide a fabric roller blind fixed to a lower bar that allows the lower bar itself to be locked and unlocked in a simple and safe manner.

Another objective of the present invention is to provide a roller blind of fabric that is completely reliable in its operation and, in particular, capable of guaranteeing the correct retention of the lower bar also in the case of sudden movements thereof and that can transmit impulses to the components of the locking device. Another objective of the present invention is to provide a roller blind of fabric that is completely efficient in its operation and, in particular, can guarantee the correct locking and unlocking of the lower bar, keeping the vertical path of the lower bar limited during the given locking and unlocking operations.

Another objective of the present invention is to provide a roller blind of fabric that is structurally simple and economical to manufacture and install.

Brief description of the drawings

The technical characteristics of the invention, in accordance with the aforementioned objectives, can be clearly seen in the content of the following claims and their advantages will be clearer in the following detailed description, which is given with reference to the attached drawings, which represent a merely illustrative 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 perspective view of a detail of the blind illustrated in Figure 1, relative to a lateral guide and the corresponding lateral end of the lower bar, with some parts removed or transparent to better illustrate other parts;

- Figures 3A and 3B show two axonometric side views of a detail of the blind with respect to an oscillating rotor in two different positions, with some parts removed to better illustrate other parts;

- Figures 4a, b, c, d, e, f, g, h, i, l show 10 views of a detail of the blind with respect to a sliding element inserted in a shaped track of a guide body in different operating positions , with some parts removed to better illustrate other parts;

- Figure 5 shows a perspective view of a detail of the blind illustrated in Figure 1, relative to a guide body intended to be mounted at the ends of a lower bar of the blind;

- Figure 6 shows a perspective view of the guide body with an element, shown at the top, for coupling the oscillating rotor arranged just above a first step, with some parts removed to better illustrate other parts;

- Figure 7 shows a front view of the guide body with the element, shown at the top, for coupling the oscillating rotor arranged in contact beyond a first step and before a second step, with some parts removed to better illustrate other parts;

- Figure 8 shows a perspective view of the guide body with the element, shown at the top, for coupling the oscillating rotor arranged housed in the seat of a locking element after the second step, with some parts removed to better illustrate other parts;

- Figure 9 shows a perspective view of the guide body with the oscillating rotor coupling element, shown at the top, arranged in contact beyond the third step, with some parts removed to better illustrate other parts;

- Figure 10 shows a front view of the guide body with the oscillating rotor coupling element, shown at the top, disposed in its highest stop position against an end stop of the shaped track and the lowest stop position against the blocking element and with the travel between such positions of prominent stop, as well as with some parts removed to better illustrate other parts.

Detailed description of a preferred embodiment

With reference to the attached drawings, reference number 1 indicates, in general, the fabric roller blind, object of the present invention.

The shutter 1, in operation, can be used to adjust in an adjustable manner an opening A of a door / window / shutter, for example, of a window, a door or a window, formed in a loading element, such as a wall of a building or a cargo structure of any building.

According to the embodiment illustrated in Figure 1, the shutter 1 comprises a support structure 2 intended to be fixed on the load bearing element, in which the opening A is formed, and preferably comprising a roller shutter box 3 intended to be placed above the opening itself A.

Advantageously, the roller shutter box 3 comprises a hollow tubular body, in particular formed by extrusion of aluminum, which extends with a substantially horizontal axis between two opposite ends closed by two side covers, in particular made of plastic material.

The shutter 1 also comprises a pick-up roller 4 rotatably restricted to the support structure 2, advantageously housed inside the roller shutter box 3, and having a rotation axis X which is substantially horizontal.

Around the pick-up roller 4, a flexible fabric 5 is capable of winding and unwinding; said fabric preferably passes through a bottom groove of the roller shutter box 3. The fabric 5 may be intended to form a darkening screen, for example, replacing a roller blind, a shade screen to filter sunlight or to form a mosquito net. Generally, the fabric 5 may be intended to close the opening of a door / window / shutter to protect an internal area from the sun and / or wind and / or, more generally, from the atmospheric conditions of the outside environment.

The fabric 5, depending on its different applications, can be made of natural or synthetic material and can be in the form of a mesh or have a continuous surface of the darkening, filtering or transparent type.

The fabric 5 has a preferably rectangular shape and has, in a manner known per se to the person skilled in the art, an upper edge fixed to the collection roller and a lower edge fixed to a lower bar 6 arranged parallel to the collection roller 4 and intended to pull the fabric 5.

The shutter 1 also comprises two lateral guides 7 that extend parallel to each other and side by side, between which the fabric 5 is able to slide following its winding and unwinding around the pickup roller 4.

More in detail, each lateral guide 7 extends longitudinally according to a respective first extension direction Y, preferably vertical and substantially orthogonal to the axis of rotation X of the pick-up roller 4, between an upper end 8 thereof, preferably arranged in the roller shutter box 3, and an opposite lower end 9 intended to be arranged on the lower edge of the opening A, for example, on the floor or on a windowsill.

The two lateral guides 7 are designed to be arranged along the corresponding sides of the opening A and to be fixed to the load bearing element (in which the opening A itself is formed), for example, by means of anchoring screws .

Advantageously, each lateral guide 7 is preferably formed by extruded metal sections, in particular aluminum, and has a substantially C-shaped cross section.

In particular, each lateral guide 7 has an open side 10, arranged in front of the open side 10 of the other lateral guide 7, and on which a longitudinal groove 11 is formed in which the lower bar 6 is slidably restrained.

The lower bar 6 of the blind 1, fixed to the lower edge of the fabric 5, extends longitudinally along a second extension direction Z parallel to the axis of rotation X of the pick-up roller 4, between its two coupled side ends 14 slidingly to the respective lateral guides 7.

In particular, the lower bar 6 is internally hollow and preferably comprises a central body 6 ', for example, constituted by an extruded aluminum metal section, at whose ends the lateral ends 14 are mechanically mounted.

The latter are preferably made of plastic material, and are positioned to laterally close the central body 6 'of the lower bar 6.

In particular, each side end 14 of the lower bar 6 has an enlarged base part 14 ', mechanically associated with the side end of the central body 6', and a connecting part 140 extending so as to project from the part of base 14 'towards the corresponding lateral guide 7 and slidably inserted in the longitudinal groove 11 of the latter.

The blind 1 also comprises movement means (not illustrated in the attached figures) mechanically connected to the pickup roller 4 and adapted to rotate the latter in order to move the fabric 5 between a collected position, in which the fabric 5 is wound around the pickup roller 4, and an extended position, in which the fabric 5 is unwound from the pickup roller 4 to at least partially close the opening A.

In particular, when the fabric 5 is in the collected position, the lower bar 6 preferably rests against the roller shutter box 3 and, when the fabric 5 is in the extended position, the lower bar 6 is placed at the ends bottom 9 of the side guides 7 with the fabric 5 unwound for the substantially total closure of the opening A.

Therefore, the fabric 5 is guided completely in its winding and unwinding following the rotation of the pick-up roller 4, with its side edges advantageously coupled to the rails (not illustrated) located within the side guides 7, and with the bottom edge fixed to the lower bar 6 coupled, in turn, to the lateral guides 7.

In particular, during the movement of the fabric 5, the lower bar 6 keeps the fabric 5 itself stretched and moves, being horizontal, with its lateral ends 14 coupled to the lateral guides 7.

Preferably, the movement means mentioned above are of the manual type and comprise, in a completely conventional manner, a winding spring connected to the pick-up roller 4 and housed together with the latter within the roller shutter box 3 of the blind 1. The unwinding of the fabric 5 will occur by manually exceeding the elastic reaction force of the spring mentioned above.

For the purposes of the present invention, the movement means can be obtained in a different way, in a way that is in itself completely conventional, with a motor housed inside the pickup roller 4, advantageously at one end thereof.

The shutter object of the invention then comprises at least one guide body 13 mechanically associated with a side end 14 of the lower bar 6 (and preferably two guide bodies 13 associated with the two corresponding side ends 14).

Each guide body 13 defines a shaped track 15, delimited by a lower part and by a guide profile described in detail with reference to the individual sections.

The shaped track 15 is intercepted by at least one locking element 16, which projects advantageously from the bottom and preferably conformed with a concavity directed at least partially upwards to define a seating for a sliding element 17A described in detail below.

The shaped track 15 is also provided with at least one inlet opening 15A and at least one outlet opening 15B capable of being traversed by the sliding element 17A. The shutter 1 also comprises at least one oscillating rotor 17, which is disposed at the lower end of at least one of the side guides 7 and, preferably, rotatably coupled to at least one base terminal 18 mounted on the end of the side guide 7. More in detail, the oscillating rotor is provided with a coupling part 17A capable of sliding in a guided manner within the shaped track 15 of the guide body of the side end 14 of the lower bar 6, to engage and disengage the locking element 16 and, therefore, retaining and releasing the lower bar 6.

In accordance with the idea underlying the present invention, the shaped track 15 is provided with one or more steps 19 that descend in the direction of travel from the inlet opening 15A to the outlet opening 15B and the sliding element 17A of the rotor Oscillating 17 is capable of sliding in the lower part of the shaped track 15 in its direction of travel, overcoming the step 19 or the steps 19 if there is more than one.

It is obvious that it should be understood that the sliding element 17A is capable of sliding in the lower part of the track 15 even only in sections close to the steps 19 and not necessarily in the entire path of the track 15.

Thanks to the aforementioned invention, therefore, the sliding element 17A and, therefore, the oscillating rotor 17, is restricted once it has entered the formed track 15 to follow the entire path to exit the same track, ensuring the correct blocking and release of the same sliding element 17A with respect to the guide body 13.

In other words, it is not possible to jump from one position to another of the shaped track 15, since the steps 19 prevent such position breaks that act for safety reasons in case of non-return of the sliding element 17A.

More in detail, each oscillating rotor 17 is rotatably coupled to the corresponding base terminal 18 by means of a pin 170 integral with the same oscillating rotor 17 and advantageously inserted into two through holes formed in two projections protruding from the base terminal 18.

The oscillating rotor 17 is preferably constituted by a small elongated bar, which is supported transversely and projecting fixed thereto, at a first free end, the sliding element 17A and, at the second restricted end, the pin 170.

Preferably, the oscillating rotor 17 is made of a plastic material and is formed by a single body, both with its sliding element 17A and with its pin 170.

The sliding element 17A advantageously has a prismatic shape, for example, with a triangular base. In order to keep the sliding element 17A in contact against the lower part of the shaped track 15, at least in the steps 19, the oscillating rotor is held pressed by elastically flexible means in a transverse direction relative to its plane of rotation.

Said means are obtained by the transverse elasticity of the oscillating rotor 17 which, as indicated advantageously, is in the form of a bar, and is capable of bending elastically transversely with respect to the plane of rotation of the oscillating rotor, overcoming the corresponding stage 19 .

Otherwise, according to a different embodiment of the invention, not illustrated in detail since it is easy for the person skilled in the art to understand, the oscillating rotor 17 is pushed elastically transversely with respect to the plane of rotation of the rotor by a spring mounted between the same oscillating rotor 17 and the base terminal 18 and, for example, coaxially mounted around the pin 170.

Once the step 19 has been overcome, the oscillating rotor 17 is pushed by the elastically flexible means towards the bottom of the shaped track 15 located beyond the step, to meet the ascent of the step as an insurmountable restriction with respect to the movements in the opposite direction to the path of the formed track 15.

The connecting parts 140 of the lateral ends 14 mounted at the ends of the central body 6 'of the lower bar 6 slide vertically in the lateral guides 7, being conveniently sized in their interior due to two first sliding parts 140', 140 "( see figure 2) that slide on the inner faces of the side guides 7.

The guide bodies 13 of the lateral ends 14 of the lower bar 6 are advantageously slidably movable with respect to the central body 6 'of the lower bar 6 and with respect to the connecting parts 140 of the same lateral ends 14, preferably for a travel of less than one centimeter, to compensate for misalignment along the lateral guideways 7. For this purpose, the guide bodies 13 are provided with an appendix 13 'in the form of an elongated bar which is inserted into a groove 13 "made in the central body 6'of the lower bar 6. Advantageously, each guide body 13 is slidably coupled with respect to the superimposed connecting part 140 due to a coupling of its sliding appendix 130 in a track 130 'formed at a lower edge of the connecting part 140.

In turn, the guide body 13 is slidably mounted on the corresponding lateral end 14 along an axis parallel to the extension of the lower bar 6 to always remain perfectly centered with respect to the lateral guides 7 on which it slides advantageously due to two second sliding parts 130 ', 130 "(see Figure 2).

For this purpose, the guide body 13 is advantageously provided with a rod 1300, which is slidingly inserted in a guided manner to fit inside a through hole formed in the base part 14 'of the side end 14 of the bottom bar 6.

In accordance with the preferred embodiment of the invention illustrated in the accompanying figures, the shaped track 15 of the guide body 13 comprises three sections 151, 152 and 153 in succession in the direction of travel V by the sliding element 17A. The first section 151 is delimited by a first lower part 151A and a first upper guide profile 151B. The latter has an end portion 151B 'having an orientation directed towards an end stop 20 and provided with at least a first vertical component 151BV facing down and with a first horizontal component 151BO, oriented in a first direction directed in accordance with the direction of travel of the shaped track 15.

The shaped track 15 then comprises, in addition to the end stop 20 located at the end of the first section 151, also the locking element 16, arranged substantially below the end stop 20.

The first section 151 of the shaped track 15 is indicated with a continuous line in Figure 5 and provides an initial ascent part in relation to the coupling element 17A to the end stop 20 and a final descent part in relation to the element of coupling 17A from the end stop 20 to the locking element 16.

The second section 152 of the shaped track 15 is, in turn, delimited by at least a second lower part 152A and at least a second upper guide profile 152B. The latter has at least a second vertical component 152BV oriented downwards, and a second horizontal component 152BO oriented in the first direction specified above.

More in detail, the end stop 20 is advantageously formed, in the case of the attached figures, by a face of the second upper guide profile 152B of the second section 152.

The third section 153 of the shaped track 15 is, in turn, delimited by at least a third lower part 153A and at least a third guide profile 153B. The latter has, in a final section thereof, 153B ', at least a third vertical component 153BV facing upwards, and a second horizontal component 153BO oriented in a second horizontal direction opposite the first horizontal direction specified above. The blocking element 16 is partially directed upwards or in an opposite direction to the end part 151B 'of the first upper guide profile 151B of the first section 151 of the shaped track and opposite to the second upper guide profile 152B of the second section 152 of the formed track 15.

The blocking element 16 also has a transfer guide profile 16B provided with a fourth vertical component 16BV facing upwards, and a fourth horizontal component 16BO oriented in the first direction specified above.

In this way, the coupling element 17A, which moves due to the horizontal components of the track guide profiles, bounces first at the final part 151B 'of the first upper guide profile 151B of the first section 151, then in the transfer guide the profile 16B of the blocking element 16 and then in the upper guide profile 152b of the second section 152.

Preferably, at least one first step 19A is provided in the first lower part 151A of the first section 151. More particularly, said first step 19A is arranged slightly higher than the blocking element 16 (intercepted by the coupling element 17A at the initial part of the relative rise of the first section 151 to the end stop 20), in order to prevent, during the coupling step of the lower bar 6, that the sliding element 17A of the oscillating rotor 17 enters the first section 151 in a direction opposite to that of the feed V of the shaped track 15 and does not go towards the end stop 20 of the first section 151.

More in detail, due to the first step 19A, even if the sliding element 17A has not reached the end stop 20, if the lower bar 6 retracts upwards and if the sliding element 17A has gone beyond the first step 19A, then the First step 19A forces the sliding element 17A to advance towards the end stop 20, since it can no longer return to the inlet opening 15A.

The shaped track 15 is also preferably provided with a second step 19B disposed substantially at the bottom of the shaped track 15 between the end stop 20 and the locking element 16 (intercepted by the coupling element 17A at the relative end part of the lowering of the first section 151 of the blocking element 16), to prevent the sliding element 17A- which descends from the lower bar 6 which rises - returns to the inlet opening 15A.

In addition, the shaped track 15 is also provided with a third step 19C disposed substantially in the lower third part of the third section 153, to prevent, during lowering of the lower bar 6, that the sliding member of the oscillating rotor moves towards the outlet opening 15B instead of inlet opening 15A.

Said third step 19C is arranged in particular at the outlet opening 15B of the shaped track 15.

The rotation movement of the oscillating rotor 17 requires a very small force, which is applied in a position that is distal from the axis of rotation X of the pin 170 of the oscillating rotor 17 and with an insignificant rotation friction.

It follows that the inclined surfaces of the guide profiles of the sections of the shaped track 15, to move the sliding element 17A of the oscillating rotor 17, can have an inclination greater than the conventional 45 ° used in the coupling / decoupling devices of known conventional blinds.

The result is that the vertical path H (see Figure 10) of the lower bar 6 necessary for coupling coupling is reduced (in the present case H is between 3 and 6 mm and preferably is approximately 4.5 mm).

Therefore, advantageously, the first upper guide profile 151B of the first section 151 of the shaped track 15 is inclined with respect to the vertical with an angle A greater than 45 ° to reduce the vertical travel of the locking element.

Preferably, also the second upper guide profile 152B of the second section 152 of the shaped track 15 is inclined with respect to the vertical with an angle B greater than 45 °, even in order to reduce the vertical path of the blocking element.

The first section 151 of the shaped track 15 is provided with an introduction slide 25 associated with the inlet opening 17A and capable of transporting the sliding element 17A of the oscillating rotor 17 towards the opening 15A. Said slide 25 guides the sliding element towards the inlet opening 15A of the shaped track 15 also forcing it transversely to the plane of rotation of the same oscillating rotor 17, being inclined for this purpose with respect to the plane of rotation of the oscillating rotor 17.

In operation, the blind 1 described so far mainly with respect to the structure, allows the lower bar 6 to be locked and unlocked at the lower end of the lateral guides 7 due to the coupling and disengagement of the oscillating rotors 17 with respect to the bodies of guide 13.

In Figures 4a-4l (which lack illustrations of the steps for simplicity in the representation), the sequence of rotation movements of the oscillating rotor 17 is indicated. Initially, this is introduced into the entrance opening 15A of the shaped track due to an inclined introduction profile 40.

Claims (10)

1. Fabric roller blind (1), comprising: - a support structure (2) intended to be fixed to a load bearing element in which an opening (A) is made; - a pick-up roller (4) rotatably restricted to said support structure (2), which has a substantially horizontal axis of rotation (X), and intended to be located above said opening (A); - two lateral guides (7) extending parallel to each other and side by side along respective first extension directions (Y) substantially orthogonal to the axis of rotation (X) of said pickup roller (4), and intended to be fixed to said load bearing element along the respective sides of said opening (A); - a fabric (5) extending between an upper edge thereof fixed to said pickup roller (4) and a lower edge thereof, and capable of sliding between said lateral guides (7); - a lower bar (6), to which the lower edge of said fabric (5) is fixed and extending, along a second direction of extension (Z), parallel to the axis of rotation (X) of said pick-up roller (4), between its two lateral ends (14) slidably coupled to the corresponding lateral guides (7); - movement means mechanically connected to said collection roller (4) and adapted to rotate said collection roller (4) to move said fabric (5) between a retracted position, in which said fabric (5) is wound around said roller of collection (4), and an extended position, in which said fabric (5) is unwound at least partially from said collection roller (4) extended between said lateral guides (7) to cover at least part of said opening (TO); - at least one guide body (13), which is mechanically associated with a lateral end (14) of said lower bar (6) and is provided with a shaped track (15), intercepted by at least one blocking element ( 16) and provided with at least one inlet opening (15A) and at least one outlet opening (15B); - at least one oscillating rotor (17), located at the lower end of at least one of said lateral guides (7), is provided with a sliding element (17A) capable of sliding in a guided manner within the shaped track ( 15) of the guide body (13) of the side end (14) of said lower bar (6) for engaging and disengaging from said locking element (16) and, consequently, retaining and releasing said lower bar (6); said blind (1) being characterized by the fact that said shaped track (15) is provided with one or more steps (19) that descend in the direction of travel (V) from said inlet opening (15A) to said opening of output (15B) and in which the sliding element (17A) of said oscillating rotor (17) is capable of sliding in the lower part of said shaped track (15) in said direction of travel (V), overcoming said one or more steps (19) during the descent. 2. Shutter according to claim 1, characterized in that said oscillating rotor (17) is pushed elastically against the bottom of said shaped track (15), transversely with respect to the plane of rotation of said rotor by elastically flexible means in said step (19). 3. Blind according to claim 1, characterized in that said oscillating rotor (17) bends elastically towards the bottom of said shaped track (15) transversely with respect to the plane of rotation of said oscillating rotor (17), by exerting an elastic pressure against the lower part of said track at least in said step (19). 4. Blind according to any of the preceding claims, characterized in that said lower bar (6) comprises a central body (6 ') and the guide body (13) of said at least one lateral end (14 ) of said lower bar (6) is slidably mounted in said central part (6 '), to compensate for misalignments of the lateral guides (7). 5. Blind according to any of the preceding claims, characterized in that the shaped track (15) of said guide body (13) comprises at least a first section (151) delimited by at least a first lower part (151A) and at least a first upper guide profile (151B) having at least a first vertical component (151BV) facing down; at least one end stop (20) placed at the end of said first section (151); at least one locking element (16) disposed substantially below said end stop (20); at least a second section (152) delimited by at least a second lower part (152a) and at least a second upper guide profile (152B) having at least a second downward oriented component (152BV), so at least a third section (153) delimited by at least a third lower part (153A) and at least a third lower guide profile (153B); said shaped track (15) being provided with at least a first step (19A) disposed in the first lower part (151A) of said first section (151). 6. Shutter according to claim 5, characterized in that said shaped track (15) is provided with at least a second step (19B) disposed substantially at the bottom of said shaped track (15) between said stop end (20) and said locking element (16). 7. Blind according to claim 6, characterized in that said shaped track (15) is provided with at least a third step (19C) disposed substantially in the lower third of said third section (153). 8. Blind according to claim 5, characterized in that the first upper guide profile (151B) of the first section (151) of said shaped track (15) is inclined with respect to the vertical one angle (A) greater than 45 °. 9. Blind according to claim 5, characterized in that the second upper guide profile (152B) of the second section (152) of said shaped track (15) is inclined with respect to the vertical one angle (b) greater than 45 °. 10. Blinds according to any one of the preceding claims, characterized in that said shaped track (15) is provided with an introduction slide (25) associated with said inlet opening (15A) and capable of transporting the element sliding (17A) of said oscillating rotor (17) towards said inlet opening (15A) forcing it transversely with respect to the rotation plane of said oscillating rotor itself (17).