FIELD OF THE INVENTION The present invention relates to the technical sector relating to external shutters of a building, in particular to shutter systems for screening and protecting an opening in a wall of a building, such as for example a window, a door or a door window. DESCRIPTION OF THE PRIOR ART

It is known, for the protection and screening of external shutters from sunlight, to have recourse to the installation of screening elements, known as shutters, located at doors, windows or door-windows of a building.

The screening elements with shutters most utilised are, for example, louver shutters made of wood, aluminium or other materials, constituted by a frame that bears a series of transversal slats, fixed or movable, or for example panel shutters, for complete screening against the light, which are usually made of wood, and which have a continuous screening surface, formed by a single panel or a series of planks flanked to one another.

Both the louver shutters and the panel shutters substantially consist of closable flaps that are hinged and rotatable about a vertical hinge axis to the jambs of an opening in a wall of a building, such as for example an opening of a door, a window or a door window.

Pairs of shutters, or even a single shutter, can usually be installed.

These shutters are provided with locks and bolts for blocking them to a wall or jamb of the opening or for blocking to another shutter. Each shutter is therefore rotatable, with respect to the jamb of the opening, according to a vertical hinge axis in order to be rotatable between a closed position of the opening or a part of the opening, and a series of open positions, so as to partially or totally open the opening or the part of opening, in which the shutter flap can be arranged and orientated with different angles with respect to the jamb. When placed in the closed position, the shutters constitute a closing and screening element of the opening as they block sunlight.

In the closed position, as well as having the screening function, shutters can also perform a protective anti-intrusion function.

However, this particular type of shutters, in particular louver shutters with fixed slats or panels, do not allow air circulation and passage between the inside and outside when they are placed in the closed position.

In order to arrange an air circulation or passage between the outside and inside, the shutters must be brought at least into a partial open position of the building, i.e. in the door, the window or the door window. By doing this, however, the anti-intrusion function of the shutters is lost.

To obviate this drawback, it is possible to proceed to the installation of special anti intrusion elements, such as bars, gratings, or gates, which are installed in the opening of the building between the shutter (i.e. between the louver shutters or panel shutters) and the fixture (door or window or door window). The bars and gratings can be directly fixed to the jambs of the opening or mounted rotatably on a frame which is then fixed to the jambs of the opening, while the gates are mounted on frames fixed to the jambs and can be opened and closed with a bellows-like movement.

The presence of bars, gratings or gates between the shutters and the fixtures can however be inconvenient in terms of both size and ease of use. In fact, in order to exit from a door, or a door window, or to look out of a window, as well as opening the shutters it is necessary to open the bars and gratings too, when they are mounted hinged to a frame that is fixed to the jambs of the opening, or are gates. This is not even possible in the case of bars or gratings which are fixed directly and rigidly to the jambs.

Further, the installation of these components between the shutters and the fixtures can also be expensive.

SUMMARY OF THE INVENTION The aim of the present invention is therefore to propose a shutter system for anti intrusion screening and protecting of an opening in a wall of a building, being for example an opening of a window, a door or a door window, able to obviate the above- cited drawbacks.

In particular, an aim of the present invention is to propose a shutter system which is configured and predisposed to provide a screening against sunlight and also enable, where required, air circulation and passage, guaranteeing at the same time an anti intrusion protection.

The above aims are attained by a shutter system according to the claims.

BRIEF DESCRIPTION OF THE DRAWINGS The characteristics of a preferred but not exclusive embodiment of the shutter system for anti-intrusion screening and protecting of an opening in a wall of a building, proposed by the present invention, will be set down in the following description, done with reference to the appended tables of drawings, in which:

- figure 1 illustrates, in a front view, the shutter system of the invention, installed in an opening of a building, such as for example in the illustrated case an opening of a door window; this figure represents a view from inside the building and with the shutter system in a first possible configuration in which it closes the opening, performing a screening of the sunlight and also forming an anti-intrusion protection;

- figure 2 illustrates the shutter system of figure 1 in a second further possible configuration, in which it enables at least partly opening the opening of the building, in order to allow air circulation or passage between the outside and the inside, and at the same time provides adequate anti-intrusion protection;

- figure 3 is a schematic perspective view of the shutter system of the invention in the configuration of figure 2;

- figure 4 illustrates the shutter system in the configuration of figure 2 but in a view from outside the building;

- figure 5 is a view from above of the shutter system in the configuration of figure 4. DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to the appended tables of drawings, reference numeral (100) denotes the shutter system for screening and protecting an opening (A) in a wall (AP) of a building, such as for example an opening of a window, a door or a door window, object of the present invention, in its entirety.

The shutter system (100) comprises a screen panel (1), which is hinged to a first jamb (A1) of the opening (A) according to a first vertical hinge axis (V) so as to be rotatable about the first vertical hinge axis (V) and movable between a first closed position (C), to close the opening (A), or a part of the opening (A), and open positions (O), to open the opening (A) or the part of the opening (A) in which in the open positions (O) the screen panel (1) can be positioned at various angles with respect to the first jamb (A1 ).

In the opening (A) of the wall (AP) of the building, in which a door is predisposed, a window, or a door window, according to the dimensions thereof, the screen panel of the shutter system of the invention can be installed singly, and then predisposed between the two jambs of the opening.

Alternatively, as for example illustrated by way of example in the figures, the screen panel (1) of the shutter system (100) can be installed in the opening together with a second screen panel (15).

In any case, the shutter system (100) of the invention is utilisable in both cases, i.e. with the screen panel (1) installed singly between the two jambs of the opening (A) or together with a second screen panel (15), which will be hinged to the second jamb of the opening (A).

The shutter system (100) further comprises a grating frame (2), comprising a first vertical side of frame (21) and a second vertical side of frame (22), parallel to the first side of frame (21), and a group of anti-intrusion elements (23) which are arranged transversally between the first vertical side of frame (21) and the second vertical side of frame (22).

In particular, the grating frame (2) is hinged with the first vertical side of frame (21) to the screen panel (1) according to a second vertical hinge axis (Z) in such a way that the grating frame (2) can rotate with respect to the screen panel (1) according to the second vertical hinge axis (Z).

In this way, the grating frame (2) can be positionable in a first non-operating position (P1), in which the grating frame (2) is neared to the screen panel (1) (see for example figure 1), and at least in a second operating position (P2) in which the grating frame (2) is rotated with respect to the screen panel (1) in such a way as to be arranged in an angled configuration with respect to the screen panel (1) (see for example figures 2 and 3). In the non-operating position (P1), the grating frame (2) is neared to the internal wall of the screen panel (1), i.e. to the wall of the screen panel (1) facing the inside of the building.

The shutter system (100) is also such that the grating frame (2) comprises a blocking device (3) which is borne by the second vertical side of frame (22) and which is configured and predisposed in such a way as to be able to block the grating frame (2) to a second screen panel (15) of the opening (A) (as in the case illustrated in the figures) or to a second jamb of the opening (A) (as in the other case previously described) once the grating frame (2) is positioned in one of the at least a second operating position (P2), angled with respect to the screen panel (1).

Owing to the special characteristics now described, the shutter system (100) of the present invention is such that, when the screen panel (1) is rotated with respect to the first jamb (A1) and positioned in an open position (O) with an angulation with respect to the first jamb (A1) in order to partly open the opening (A) or a part of the opening (A) to define an air passage space (S) (figure 2, figure 3, figure 4, figure 5), the grating frame (2) can be rotated and moved into the second operating position (P2) at an angle with respect to the screen panel (1) and blocked to the second screen panel (15) or to the second jamb of the opening (A) by means of the blocking device (3).

In this way, the grating frame (2) constitutes an anti-intrusion barrier at the air passage space (S) which is created between the screen panel (1), in the open position (O), and the second screen panel (15) or the second jamb of the opening (A).

Thus, every time it is desired to have air circulation or passage between the inside and outside, it is sufficient to open the screen panel (1) into an open position (O) by arranging it at a given angle with respect to the jamb (A1) of the opening, and then rotate the grating frame (2) about the second vertical hinge axis (Z) with respect to the screen panel (1) and move it into the operating position (P2) in which it is positioned at an angle with respect to the screen panel (1), and then block the grating frame (2) to the second screen panel (15) or to the second jamb of the opening (A) by means of the blocking device (3). The space (S) for air circulation and passage that is created between the screen panel (1), in the open position (O), and the second screen panel (15), or the second jamb of the opening (A) is thus occupied by the grating frame (2), which constitutes an anti intrusion barrier; therefore with the shutter system of the invention it is possible to have air circulation and passage between the inside and outside of the building in total safety, without having to proceed to the installation of bars, gratings or gates at the opening and in front of the door, window or door window.

The dimensions of the grating frame (2), in particular the width, can be specially chosen according to the degree of opening, in the angulation, which it is desired to have for the screen panel (1), i.e. the dimensions of the space for air circulation and passage that is desirable.

Further and other aspects of the shutter system of the invention are described in the following.

In the preferred though not exclusive embodiment illustrated in the figures of the drawings, the shutter system (100) can comprise a first plate (24), which is fixed in a first upper position above the screen panel (1) and a second plate (25), fixed in a second lower position beneath the screen panel (1) (visible for example in greater detail in figure 2).

In this case, the first vertical side of frame (21) of the grating frame (2) is hinged to the first plate (24) and to the second plate (25) according to the second vertical hinge axis (Z) by means of hinges (26) or pivots (26). For the purpose of facilitating the blocking of the grating frame (2) to the second screen panel (15), or to the second jamb of the opening (A), when the grating frame (2) is rotated into the second operating position (P2) with respect to the screen panel (1), open in the open position (O), the blocking device (3) is advantageously mounted on an upright member (4) which is hinged rotatably about a vertical axis at the second vertical side of frame (22).

In this way, the blocking device (3), owing to the possibility of rotation of the upright (4) with respect to the second side of the frame (22), can be orientated and rotated in such a way as to enable the hooking thereof to the second screen panel or the second jamb.

In a preferred but not exclusive aspect, the blocking device (3) can comprise a locking and blocking element (31), for example of a lever or cylinder type, destined to couple with a suitable abutment element present in the second screen panel (15) or in the second jamb (not illustrated in detail).

The blocking device (3) can also comprise at least a rod (32, 34), which is arranged with a first part internal of the upright member (4) and connected to the locking and blocking element (31), and which comprises a second part, externally of the upright member (4), which is provided with a hook (33, 35).

The at least a rod (32, 34) is vertically translatable with respect to the upright (4) between a raised position and a lowered position, when the locking and blocking element (31) is activated to block the screen panel (1) to a second screen panel (15) or to a second jamb of the opening (A) in such a way that the hook (33, 35) can couple to a bolt (not illustrated in the figures) present in the second screen panel (15) or to an abutment present in the second jamb of the opening (A).

In the figures, the blocking device (3) comprises two rods, an upper rod (32) and a lower rod (34), both provided at the relative ends of hooks (33, 35).

According to the preferred embodiment illustrated in the figures, the anti-intrusion elements (23) comprise a series of rods or cylindrical bars arranged parallel to one another between the first vertical side of frame (21) and the second vertical side of frame (22) of the grating frame (2).

For example, they can be arranged horizontally, as illustrated in the figures, or vertically.

In a possible further embodiment (not illustrated), the anti-intrusion elements (23) comprise a series of rods or cylindrical bars which are arranged reciprocally intertwined to form a grid structure between the first vertical side of frame (21) and the second vertical side of frame (22) of the grating frame (2).

In a particularly advantageous aspect, not illustrated in detail in the figures, the first vertical side of frame (21) and the second vertical side of frame (22) of the grating frame (2) can be made telescopic or the grating frame (2) can comprise at least an auxiliary grating frame, for example arranged superiorly or inferiorly, which can be mounted slidably on the first vertical side of frame (21) and the second vertical side of frame (22) in such a way as to be positioned superiorly in a raised position, or inferiorly in a lowered position, with respect to the grating frame (2), when the grating frame (2) is rotated into the second operating position (P2) with respect to the screen panel (1) so as to be arranged in an angled configuration with respect to the screen panel (1).

In this way, the grating frame (2) can have a smallest-volume configuration, when placed in the first non-operating position (P1) neared to the screen panel (1), then pass to a maximum-volume configuration, and therefore a maximum occupation of the air circulation and passage space (S), when rotated into the second operating position (P2) at an angle with respect to the open screen panel (1).

Other ways can be included of bringing the grating frame (2) from a minimum-volume configuration to a maximum-volume configuration (in height) all falling within the scope of the present invention.

The shutter system (100) can preferably comprise removable blocking elements (not illustrated in the figures) which are predisposed on the screen panel (1) and positioned in such a way as to removably block the grating frame (2) to the screen panel (1) when the grating frame (2) is positioned in the first non-operating position (P1) against the screen panel (1).

In this way, there is no risk that the grating frame (2) can rotate autonomously with respect to the screen panel when it is not desired to use it.

The screen panel (1) can be constituted by a louver shutter, made of wood or aluminium or other materials, with fixed or movable slats, or by a panel shutter, made of wood or aluminium or other materials.

In a further aspect, the shutter system (100) can comprise a group (6) of arms (61, 62) hinged to one another (see for example figure 5 in particular) and which are hinged, on one side, to the upper part of the grating frame (2) and, on the other side, to the screen panel (1) in such a way as to occupy the upper part of the space (S) which is created between the screen panel (1) and the grating frame (2) when the screen panel (1) is moved into the open position (O) with respect to the first jamb (A1) and the grating frame (2) is rotated into the second operating position (P2).

As well as giving a greater stability to the grating frame (2) during the rotation from the first non-operating position (P1) to the second operating position (P2), the group (6) of hinged arms also occupies an upper portion of the air circulation and passage space (S), thus constituting a further anti-intrusion element.