DESCRIPTION TECHNICAL FIELD OF THE INVENTION

[001] The present invention relates to a window assembly having a wing that can be opened in the way "turn only", that is with a rotation about a vertical rotation axis up to 180 °with respect to the closed position, wherein the hinge elements defining the rotation axis are concealed, that is completely hidden from view.

BASIC TECHNIQUE OF THE INVENTION

[002] The known window assemblies comprise a fixed frame, formed by a plurality of sections defining a pair of uprights and a pair of crosspieces, adapted to be associated to the peripheral edges of an opening obtained in a wall.

[003] A wing, comprising at least a panel of transparent material, can be mounted to said fixed frame, and can be moved, thanks to activating means such as a handle, between a closed position, wherein it basically lies on the plane defined by the fixed frame, basically overlapping the opening, and a plurality of opening positions, wherein the wing is disconnected from said frame, so as to leave at least a portion of the opening free.

[004] Generally, the window assemblies used in building for housing open inwards, essentially in two opening ways: "turn only" and "tilt". According to the way called "turn only", the wing is caused to turn about a first vertical hinge axis, defined by two or more hinge elements arranged in correspondence of an upright of said frame; in this case, the wing is allowed a rotation up to about 180 ° with respect to the closed position, so that the same reaches the maximum opening position, placing itself basically on the plane defined by the frame.

[005] On the contrary, in the opening way called "tilt", the wing is caused to rotate about a horizontal axis, passing in correspondence of the lower crosspiece of the frame; in this case, it is allowed a rotation of about 20 ° controlled by the support arms, which prevent the wing detachment from the frame.

[006] In order to improve the overall appearance of the window, in particular in the closed position, and make the tampering of the same more difficult, the so called "concealed" hinge elements are used, as they are concealable within the uprights and the crosspieces of the frame and hidden by the wing. [007]However, these concealed hinge elements have a drawback: because of their positioning, they allow to obtain the "turn only" opening of the wing by an angle slightly greater than 90 ° with respect to the closed position, beyond which the wing abuts against the upright in correspondence of which the hinge elements are housed, making it impossible to reach the maximum opening position of the wing.

[008] This involves the disadvantage of not being able to use the whole span of the opening to which the window assembly is associated and moreover of having the wing bulk in the adjacent space. Furthermore, in some cases, there can be problems connected to safety, which make the use of this type of window assemblies inadvisable.

[009] Another problem that more and more often must be faced concerns the spreading of fires developing outside the building towards its inside. In fact in order to respect the thermal dispersion coefficients required by the current regulations, recently built and/or refurbished buildings have a covering layer, placed externally to the brickwork, in jargon called "overcoat" made of a high performing insulating material, very often inflammable, even though generally self-extinguishing; therefore, if a fire occurs in the vicinity of the building, the flames do not develop, but the fire itself tend to spread without developing the flames inside the "overcoat". Clearly, as soon as the flames come close to a fissure, for example formed in correspondence of a window assembly, they enter inside the building, damaging it even seriously.

[0010] It would therefore be desirable that the window assemblies had also a valid protection against fires, so as to avoid the spreading of fires inside the buildings where they are applied.

SUMMARY OF THE INVENTION

[0011] Main task of the object of the present invention is that of overcoming the drawbacks of the known art devising a window assembly wherein the hinge elements are concealed when the wing is in the closed position, but wherein it is possible to obtain both the "turn only" opening of the wing, with the rotation of the same up at least 180 ° with respect to the closed position, and the "tilt" opening.

[0012] In the field of the above described task, an object of the present invention is that of realizing a window assembly wherein the frame bulk is reduced, to the benefit of the glazing surface and consequently of the appearance, of the brightness and of the saving of the amount of materials used for its realization.

[0013] Another important object of the present invention is that of providing a window assembly that respects the strength and reliability requirements but at the same time that is practical, efficient and of a good appearance. [0014] An important object of the present invention is that of providing a window assembly which offers a good fire protection.

[0015] Not the least object of the present invention is that of providing a window assembly that achieves the above described task and objects with competitive production costs, so that its use is advantageous also from the financial point of view, and that can be obtained by means of the usual and known plants, machinery and equipment.

[0016] The above said task, the objects and advantages, as well as others which will become more apparent in the following description, are achieved by a window assembly as specified by claim 1 .

BRIEF DESCRIPTION OF FIGURES

[0017] The subsequent claims specify further characteristics of a window assembly according to the present invention which will be better described in the description of a particular but not excluding embodiment shown for exemplification only but not limited to in the appended drawings wherein:

- figure 1 shows a front view, from the inner side, of a window assembly according to the present invention wherein the wing is in the closed position;

- figures 2A and 2B are vertical sectional views of the respectively upper and lower hinge elements of a window assembly according to the present invention having the wing in the closed position;

- figure 3 is an enlarged view of the particular circled in figure 1 ;

- figures 4A and 4B are horizontal sectional views of a window assembly according to the present invention respectively in correspondence of the lower crosspiece and of the upper crosspiece having the wing in the closed position;

- figure 5 shows a front view, from the inner side, of a window assembly according to the present invention wherein the wing is arranged for the "turn only" opening;

- figure 6 is a vertical sectional view of an upper hinge element of a window assembly according to the present invention having the wing arranged for the "turn only" opening;

- figure 7 is an enlarged view of the particular circled in figure 5;

- figures 8a and 8B are horizontal sectional views of a window assembly according to the present invention respectively in correspondence of the lower crosspiece and of the upper crosspiece, having the wing in a complete "turn only" opening position; - figure 9 is a perspective view of a displacement mechanism in correspondence of the lower crosspiece of a window assembly according to the present invention having the wing in a "turn only" opening position;

- figure 10 shows a front view, from the inner side, of a window assembly according to the present invention wherein the wing is arranged for the "tilt" opening;

- figure 1 1 is a vertical sectional view of an upper hinge element of a window assembly according to the present invention having the wing arranged for the "tilt" opening;

- figure 12 is an enlarged view of the particular circled in figure 10;

figure 13 is a horizontal sectional view of a window assembly according to the present invention in correspondence of the upper crosspiece having the wing arranged for the "tilt" opening position;

- figure 14 is a perspective view of a displacement mechanism in correspondence of the upper crosspiece of a window assembly according to the present invention, having the wing arranged for the "tilt" opening position, and

- figure 15 is a vertical sectional view of a window assembly according to the present invention, when applied to a wall of a building.

DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION

[0018] With reference to the aforementioned figures, in particular to figure 1 , it is referred to as number 1 a window assembly according to the present invention, that is an assembly designated to close an opening Z made in a wall.

[0019] In the following description, terms such as "on", "under", "upper" "lower", "up", "down", "lateral", "vertical", "horizontal" or the like are referred to a window assembly 1 in its normal arrangement, that is in use, as shown in the appended figures.

[0020] Said window assembly 1 comprises a frame 2, composed of a plurality of sections suitably joined and that can be associated in a fixed way to the peripheral edges of said opening Z; preferably, the sections forming said frame 2 comprise a first and a second lateral upright 2A, 2B, arranged vertical and parallel, and a pair of crosspieces 2C, 2D, respectively upper and lower, both arranged horizontal and parallel.

[0021] A wing 3, comprising a panel 3A preferably formed by one or more sheets of transparent material such as glass, is associable to said frame 2 in order to removably close said opening Z. In case, said wing 3 can comprise an interfacing frame 4 that peripherally encloses said panel 3A; preferably, if said frame 3 is formed by at least a pair of sheets of transparent material facing each other to form at least an insulating chamber, said interfacing frame 4 can at least partially be housed in the panel 3A in correspondence of the peripheral edges of said insulating chamber. Preferably, in this case, the sheets forming said panel 3A can have a serigraphy in correspondence of the peripheral edges in order to obtain an aesthetic concealment of the frame 4.

[0022] Said wing 3 is movable, thanks to suitable operating members 99, such as a rotatable handle mounted integral to it, between a closed position, shown in figure 1 , wherein said wing 3 basically lies on the plane defined by the frame 2, so as to basically overlap said opening Z, and a plurality of opening positions, wherein said wing lies on different planes with respect to the one defined by the frame 2, leaving free at least one portion of said opening Z.

[0023] Support and hinge means 10 are provided so as to rotatably mount said wing 3 to said frame 2; they comprise at least a first and a second hinge element 10A, 10B respectively called lower and upper, both arranged in correspondence of a first upright 2A of the frame 2.

[0024] Said first and second hinge element 10A, 10B are advantageously formed by a respective first and second cylindrical seat 1 1 A, 1 1 B within which it can be inserted a corresponding first and second hinge pin 12A, 12B; in particular, said first and second hinge pin 12A, 12B extend along a basically vertical axis, defining a first hinge axis X-X about which said wing 3 can rotate in order to go from the closed position to a "turn only" opening position.

[0025] Advantageously, according to a particular characteristic of the invention, when said wing 3 is in a closed position, said first hinge axis X-X is basically aligned with the axis of said first upright 2A in correspondence of which said first and second hinge elements 10A, 10B are arranged, thus being not visible from the inner side of the opening Z.

[0026] According to a very advantageous characteristic of the invention, said window assembly 1 further comprises a displacement mechanism 100 through which, during the "turn only" opening phases of the wing 3, said first hinge axis X-X, defined by said first and said second hinge pin 12A, 12B, is made translate progressively from the initial position wherein it is basically aligned with the upright 2A of the frame 2 and, correspondingly, said wing 3 is in the closed position, to a displaced position with respect to the axis of said first upright 2A, wherein said hinge axis X-X is arranged beyond the plane defined by the frame 2, consequently allowing the rotation of the wing 3 at least up to 180 ° with respect to the closed position in order to obtain the "turn only" opening of the same, as shown in figures from 5 to 9.

[0027] Furthermore, said window assembly 1 allows the "tilt" opening of the wing 3, that is through a rotation about a second hinge axis Y-Y, extending substantially horizontally in correspondence of said lower crosspiece 2C, as shown in figures from 10 to 14.

[0028] In particular, the passage of the wing 3 from the closed position to the different opening positions, that is to the "turn only" and to the "tilt" opening, is carried out by means of the coordinated operation of said displacement mechanism 100 and of a selective locking mechanism 200 operated by the user through said handle 99.

[0029] Said displacement mechanism 100 comprises pairs of components, arranged symmetrically respectively in correspondence of the lower crosspiece 2C and of the upper crosspiece 2D of the frame 2. For simplicity, the following description is given with reference to figure 8A, wherein are shown the components of the displacement mechanism 100 arranged in correspondence of the lower crosspiece 2C; anyway, the same components are symmetrically provided in correspondence of the upper crosspiece 2D as well.

[0030] In particular, said displacement mechanism 100 preferably comprises a pair of first movement arms 104 and a pair of second movement arms 106, slidably movable along orthogonal directions and mutually connected through a pair of transmission members 105. Each of said pair of first movement arms 104 is operatively associated with said wing 3 through a respective connecting arm 101 , and each of said pair of second movement arms 106 is instead associated with an end portion 106B to the respective hinge pin 12A, 12B of said hinge elements 10A, 10B, and in its turn rotatably inserted within the corresponding cylindrical seat 1 1 A, 1 1 B.

[0031] Each of said pair of first movement arms 104 is preferably formed by an elongated rigid body, preferably having a reduced thickness, that is flat, slidably housed within a guide groove 13 extending superficially on the respective crosspiece 2C, 2D. Each of said pair of first movement arms 104 comprises a first end portion 104A associable to a guide pin 102 slidably inserted within a respective blind opening 103, preferably eyelet-like, obtained on the respective crosspiece 2C, 2D, and a second end portion 104B provided with a first engaging toothing 104C.

[0032] Each of said pair of transmission members 105 comprises on the contrary a toothed wheel, secured in a freely rotatably way on the corresponding crosspiece 2C, 2D about a vertical axis, and provided with a circumferential toothing 105A arranged along the peripheral edge, adapted to engage the first engaging toothing 104C of the corresponding first movement arm 104.

[0033] Also each of said pair of second movement arms 106 comprises an elongated rigid body, preferably having a reduced thickness, and is substantially arranged orthogonal with respect to the corresponding first movement arm 104. Furthermore it is laterally provided with a second engaging toothing 106A, adapted to engage the circumferential toothing 105A of the respective transmission member 105.

[0034] Said displacement mechanism 100 can further comprise a first support arm 107, associable through a first end portion 107A to said first lower hinge pin 12A and through the opposite end portion 107B being rigidly secured to said first upright 2A of said frame 2. Said first support arm 107 is preferably formed by an elongated element, having a reduced thickness, and is preferably made of a rather rigid and resistant material, such as steel, capable of supporting the weight of the wing 3, in particular when the latter is in the "turn only" opening position.

[0035] Furthermore, advantageously, said displacement mechanism 100 comprises a second support arm 108, having a first end portion 108A connected to said upper hinge pin 12B and the opposite end portion 108B articulated, through a slidable pin in an eyelet-like groove, to a portion of said interfacing frame 4 of the wing 3 arranged in correspondence of the upper crosspiece 2D. This second support arm 108, preferably formed by an elongated element, having a reduced thickness, preferably made of a rather rigid and resistant material such as steel, is capable of supporting the wing 3 when the latter is in the "tilt" opening position.

[0036] Said pair of first movement arms 104 is operatively associated with said wing 3 through a pair of connecting arms 101 , each one formed by a rigid elongated rod; in particular, in correspondence of the lower crosspiece 2C, said connecting arm 101 can be connected with a first end portion 101 A to a first pin 33, fixed to a block, protruding with respect to the peripheral edge of the wing 3 in the vicinities of said first upright 2A, and with the opposite end portion 101 B being, this one as well, hinged to said guide pin 102.

[0037] Conversely, in correspondence of the upper crosspiece 2D, said connecting arm 101 is associated with a first end portion 101 A to said second support arm 108 through a second pin 34, as it can be seen in figures 4B and 8B, and through the opposite end portion 101 B is hinged to said guide pin 102. [0038] Said selective locking mechanism 200 instead comprises a first and a second transmission rod 20A, 20B both movable simultaneously along opposite directions and accommodated in a first sliding cavity 30 obtained within said interfacing frame.

[0039] Said first and second rod 20A, 20B are basically formed of spring steel sheets and thus, by means of suitable and known transmission means arranged in correspondence of the 90 ° connecting portions of said interfacing frame 4, transmit the motion imposed by the handle 99 basically to the whole perimeter of the frame 4.

[0040] As it can be seen for example in figure 1 shown by a dashed line, said first transmission rod 20A extends from the handle 99, by which it is operated, towards the upper area of the interfacing frame 4, and is operatively connected to said second cylindrical seat 1 1 B of said upper hinge element 10B.

[0041] Said second transmission rod 20B, it too shown by a dashed line in figure 1 , on the contrary extends from the handle 99 towards the lower area of the interfacing frame 4, and it is operatively connected to a tip 31 , slidably accommodated in a second cavity provided within said interfacing frame 4 and parallel to said first cavity 30, suitable to be inserted within a corresponding seat 32 obtained in the lower crosspiece 2C of the frame 2 in order to obtain the "tilt" opening of the wing 3, as later described with greater detail.

[0042] Said transmission rods 20A, 20B are moreover provided with a plurality of locking pins 90, suitable to cooperate selectively with a corresponding plurality of closure assemblies 80 to retain said wing 3 in a closed position or to allow the opening of the same.

[0043] Said plurality of closure assemblies 80 comprises a plurality of abutment plates 81 , mounted in correspondence of edge portions of said interfacing frame 4 and communicating with said first cavity 30 wherein said transmission rods 20A, 20B are slidably accommodated, each of said abutment plates 81 being provided with a through opening 82 facing a corresponding seat belonging to a plurality of engaging seats 21 obtained on the sections forming said frame 2, and a groove 83, provided on the surface of the plate 81 adjacent to the opening 82.

[0044] In particular, each of said plurality of locking pins 90 is slidably associated, for example about a fulcrum 90B positioned at one of its edges, to said transmission rods

20A, 20B and it is arranged so that its free end portion 90A is adapted to selectively cooperate with said through opening 82 obtained on a corresponding abutment plate 81 to switch between a first configuration, wherein it is protruding from the edges of said interfacing frame 4 and at least partially housed in the respective plurality of engaging seats 21 to retain the wing 3 in the closed position, and at least a second configuration wherein it is retracted with respect to the edges of said interfacing frame 4 to allow the opening of said wing 3.

[0045] Advantageously, the passage between said first configuration and said second configuration of said locking pins 90 occurs by means of a roto-translation movement due to the dragging movement imposed by the sliding movement of the corresponding transmission rods 20A, 20B.

[0046] As it is apparent, the fact of being provided with a selective locking mechanism 200 wherein the locking pins 90 are "concealed" in the interfacing frame 4 of the wing 3, as they are retractable within it, allows to reduce the bulk of the frame 2 to a minimum.

[0047] The coordinated operation of said displacement mechanism 100 and of said selective locking mechanism 200, operated by the user through said handle 99, allows to switch the wing 3 between a closed position and an opening position, as detailed hereinunder.

[0048] Initially, when said wing 3 is in the closed position (figure 1 ), that is it is lying in abutment on said frame 2, possibly against suitable seals, said first hinge axis X-X is in the initial position, that is basically lying on the plane defined by said frame 2, in correspondence of said first upright 2A. In this position, the handle 99 acquires a first position, wherein it is preferably arranged vertically, with an operating end portion 99A facing downward.

[0049] Said connecting arms 101 , said pair of first movement arms 104 and said second pair of movement arms 106 are housed in correspondence of the respective upper 2D or lower 2C crosspiece, as it can be seen respectively in figures 2A, 4A and 2B, 4B.

[0050] Furthermore, as shown in figure 3, said locking pins 90 are arranged according to a first configuration, that is so as to be inserted in the openings 82 of the respective abutment plates 81 , having the free end portion 90A protruding beyond the edge of said interfacing frame 4 and therefore housed within the respective seat of said plurality of engaging seats 21 provided in the frame 2.

[0051] Holding the operating end portion 99A of the handle 99, the user actuates the selective locking mechanism 200 to allow the opening of the wing. By a rotation of about 90 °, the user moves the handle 99 to a basically horizontal position, thus actuating, by means of known and conventional gearings, the movement into opposed directions of said first and second transmission rod 20A, 20B. In particular, said first rod 20A will undergo a first movement shown by the arrows F1 of figure 1 , and said second rod 20B a movement shown by the arrows F2, thus acquiring the position shown in figure 5 wherein the wing 3 is arranged for the "turn only" opening.

[0052] In their translation movement inside said first cavity 30, said rods 20A, 20B drag with them said locking pins 90 which, being associated to the same about a fulcrum 90B, make a roto-translation movement so as their respective free end portion 90A exits the corresponding engaging seat 21 , acquiring said second configuration, that is retracting within the edge of the interfacing frame 4 of the wing 3 and basically being flush with the opening 82 of the corresponding abutment plate 81 (figure 7).

[0053] Contextually, the movement of said first transmission rod 20A involves the ensuing movement of the cylindrical seat 1 1 B of said upper hinge element 10B, which involves a partial exit from the respective hinge pin 12B, as shown in figure 6.

[0054] At this point, the wing 3 is then arranged to switch from the closed position to the "turn only" opening position. The user can therefore rotate the wing 3 about said first hinge axis X-X; this movement causes the activation of said displacement mechanism 100, in particular through the connecting arm 101 arranged in correspondence of the lower crosspiece 2C, which is articulated at the first pin 33 protruding from the peripheral edge of the wing 3 through its first end portion 101 A.

[0055] The connecting arm 101 arranged in correspondence of the upper crosspiece 2D follows the movement of the wing 3 thanks to the second pin 34 through which it is associated to said second support arm 108.

[0056] The guide pins 102 associated to the second end portion 101 B of each of said pair of connecting elements 101 are caused to translate within the corresponding eyelet-like opening 103 obtained in the respective crosspiece 2C, 2D, that in turn provokes a corresponding translation, within the grooves 13, of said pair of first movement arms 104.

[0057] Since the toothing 104C of each of said pair of first movement arms 104 engages the circumferential toothing 105A of the respective transmission member 105, their translation movement drags the latter rotating about its own vertical axis.

[0058] Contextually, the circumferential toothing 105A of the transmission member 105 engages the respective toothing 106A of each of said pair of second movement arms 106, and provokes its corresponding movement from a position wherein it is retracted in the plane defined by the frame 2, to a position wherein at least its end portion 106B, connected to the respective hinge pin 12A, 12B, is protruding with respect to the plane defined by the frame 2. [0059] Said first hinge axis X-X, defined by said hinge pins 12A, 12B, is then progressively made translate from a position wherein it basically lies in the plane of the frame 2 to a displaced position, wherein it is arranged beyond the plane defined by the frame 2, thus allowing the "turn only" opening of the wing 3, as shown in figures 8 and 9, until it reaches the position of complete opening.

[0060] When the wing 3 is "turn only" opened as explained above, the weight of the same wing 3 is basically discharged on the end portion 106B of the arm belonging to said pair of second movement arms 106 positioned in correspondence of the lower crosspiece 2C, which protrudes overhanging, as shown in figure 9.

[0061] Advantageously, when said wing 3 is moved from the closed position to a "turn only" opening position, said first support arm 107 bends laterally, allowing the movement/displacement of said first hinge axis X-X, but at the same time it supports the weight of the wing 3 and thus avoids that the same is discharged on the displacement mechanism 200, damaging it or anyhow greatly straining the element that make it up.

[0062] On the contrary, in order to obtain the "tilt" opening of the wing 3, it is necessary to bring the wing back to a closed position. Subsequently, holding the operating end portion 99A of said handle 99 and giving the same a further rotation by 90 ° with respect to the position shown in figure 5, the user makes the wing ready for a "tilt" opening, that is with a rotation about a second hinge axis Y-Y, basically extending horizontally in correspondence of said lower crosspiece 2C, as shown in figure 10.

[0063] The movement of the handle 99 provokes a further sliding movement in opposite directions, of said first and second transmission rod 20A, 20B within the first cavity 30, which consequently drag with themselves said plurality of locking pins 90 articulated to them, so that their free end portions 90A place themselves within said grooves 83 of said abutment plates 81 , as shown in figure 7. In this configuration, said locking pins 90 are therefore retracted within the interfacing frame 4 of the wing 3, not interfering then in the handling operations of the same wing 3.

[0064] Furthermore, the translation movement of said first transmission rod 20A involves the consequent movement of the cylindrical seat 1 1 B of said upper hinge element 10B to which it is connected, involving its complete exit from the corresponding hinge pin 12B, as shown in figure 1 1 .

[0065] The translation movement of said second transmission rod 20B involves instead the exit of said tip 31 with respect to the interfacing frame 4 of the wing 3, which engages itself in the seat 32 obtained in the lower crosspiece 2C, in the area underneath the handle 99. [0066] At this point, therefore, the wing 3 takes the configuration shown in figure 10, being arranged for the "tilt" opening; in fact, it is free to rotate about said second hinge axis Y-Y, also thanks to the fact that the end portion 106B of the lower arm of said second pair of movement arms 106 is advantageously provided with a support seat having a basically semispherical shape, adapted to cooperate with the head, suitably shaped, of said lower hinge pin 12A to allow that rotation of the wing 3.

[0067] As it can be seen in figures 13 and 14, the movement of the "tilt" opening of the wing 3 is controlled by said second support arm 108, which limits its rotation about said second hinge axis Y-Y. During the movement of the "tilt" opening the connecting arm 101 arranged in correspondence of the upper crosspiece 2D, though being connected to the second support arm 108 through the pin 34, rotates of a moderate degree that anyway does not impress any movement to the displacement mechanism 100, which remains in a resting position.

[0068] In figure 15 it is shown a vertical section of the window assembly 1 according to the invention when it is applied to an opening obtained in a partition wall between the inside I and the outside E of a building comprising, besides the brickwork, a covering outer layer working as thermal insulation, in jargon known as "overcoat", previously described.

[0069] Advantageously, the outer sheet of the wing 3 is made of fireproof glass that, thanks to resistance properties to high temperatures of the material, prevents the flames from being spread from the outside towards the inside of the building.

[0070] Furthermore, preferably, in order to keep the panes of the wing 3 on the interfacing frame 4 and in order to mount the frame 2 on the brickwork, peripherally to the window assembly 1 are used suitable locking elements 55, made of steel, associated to a plurality of thermal expandable gaskets 56, made of a material adapted to dilate due to the high temperatures developing in a fire, so as to seal the possible fissures in the window assembly 1 , thus preventing the flames from spreading from the outside to the inside of the building.

[0071] In conclusion, from the foregoing it is therefore apparent that the present invention achieves the objects and advantages set forth. In fact, it has been devised a window assembly 1 wherein the hinge elements are concealed when the wing is in the closed position, but wherein it is allowed to obtain both the "turn only" opening, wherein the wing can rotate at least up to 180 ° with respect to the closed position, and the "tilt" opening as well. [0072] Furthermore, in a window assembly 1 according to the present invention, thanks to the presence of a selective locking mechanism 200 as described above, the bulk of the frame 2 and of the interfacing frame 4 of the wing 3 is reduced with respect to the solutions of the known art, to the benefit of the glazing surface and consequently of the appearance of the brightness and of saving the amount of materials to use for its realization.

[0073] Therefore, thanks to the reduced use of materials in favor of the glazing surface, and to a careful study of the properties of the materials used in the assembling and to the adoption of a series of technical devices as in the foregoing, said window assembly 1 further offers a good fire protection.

[0074] Furthermore, when said wing 3 is in the closed position, the locking pins 90 of said selective locking mechanism 200 can protrude more than the double with respect to the closing means of the known art, thus increasing the protection against burglary of the window assembly 1 .

[0075] Advantageously, a window assembly according to the invention is carefully designed in order to be particularly strong for example thanks to the first support arm 107 which discharges the displacement mechanism 100 from the weight of the wing 3, ensuring a long lifetime of the components and an optimal ease of the opening movements.

[0076] Of course the present invention is susceptible of a great number of applications, changes or modifications without exiting its protection field as set forth in the appended claims. Furthermore the materials and equipment used to realize the present invention, as well as the forms and sizes of the single components, can be the most suitable depending on the specific requirements.