WO2025099553A1

WO2025099553A1 - Concealed hinge

Info

Publication number: WO2025099553A1
Application number: PCT/IB2024/060865
Authority: WO
Inventors: Alberto TASSI
Original assignee: Anselmi et C SRL
Current assignee: Anselmi et C SRL
Priority date: 2023-11-06
Filing date: 2024-11-04
Publication date: 2025-05-15
Anticipated expiration: 2026-05-06

Abstract

Concealed hinge (1) of articulation of a door with respect to a fixed structure, preferably of a door with respect to a door jamb, said hinge comprising: - a first containment structure (10) configured to be inserted within a first cavity made in the door, a first insert (11) configured to be inserted and housed within said first containment structure (10), first fastening means (12) to bind said first insert (11) to the first containment structure (10), a second containment structure (20) configured to be inserted within a second cavity obtained in said fixed structure, a second insert (21) configured to be inserted and housed within said second containment structure (20), second fastening means (22) to bind said second insert (21) to the second containment structure (20), an articulation device (30) which connects said first insert (11) and said second insert (21) to each other to allow rotation of the door with respect to said fixed structure.

Description

CONCEALED HINGE.

TECHNICAL FIELD

The present invention concerns a concealed hinge for articulating two elements together and, in particular, for articulating a door (of a door, furniture or similar) to a jamb or to a fixed structure (of a door, furniture or similar).

The present invention also relates to a method of assembling/mounting a concealed hinge.

STATE OF THE ART

It is well known that hinges are made up of particular components used to articulate two elements together and, in this case, a door (of a wardrobe or a door) to a fixed structure or jamb (of a wardrobe or a door).

Among the hinges, the so-called "concealed" ones are also known, which on the one hand are invisible when the door is closed and on the other hand allow the door to rotate up to approximately 180°. In particular, they comprise two bodies that are connected to each other by a pair of arms which allow the rotation of one body with respect to the other and therefore of the door with respect to the jamb. Each of the two arms is articulated to the other in an area between the two ends and has one end articulated to one of the two hinge bodies and the other sliding along the other body, or articulated to it. Furthermore, the concealed hinges comprise two flanged containers or "cups", which are recessed respectively in the thickness of the door and in the jamb and which define a housing seat for the respective hinge bodies, which are connected to each other by the pair of articulated arms. Advantageously, furthermore, the well- known concealed hinges are also adjustable and, in particular, the adjustment of the hinge is generally obtained thanks to the relative mobility of each hinge body inside the respective cup.

Currently, each hinge body, which is generally made of metal, such as zinc alloy (zama) or aluminum, is fixed to the corresponding flanged container by means of one (or more) screws which, after passing through respective through holes made on the hinge body, are screwed into their respective seats, already internally threaded, which are made in the corresponding flanged container. In particular, in the case of a flanged container made of metal, the threading of the seats is specifically made on the hinge body by means of a specific and dedicated process which, inevitably, requires a certain execution time and an further cost. Furthermore, this entails, in the case of threading processing carried out in-line, the need to provide an automatic station dedicated to this process, and therefore a greater complexity of the automatic hinge assembly line; while, in the case of threading processing carried out off-line or externally, the handling of the piece or in any case appropriate logistics management is required. Furthermore, the internal threading of the seats to be obtained on the flanged container requires the use of lubricating oil, with the risk of dirtying the pieces and/or the line and thus generating quality problems during the finishing phase.

Furthermore, in the case of a flanged container made of plastic material, in order to define the internally threaded seat for screwing in a fastening screw, an further piece is used, for example a bushing or a nut made of metal material with an internally threaded hole, which is slotted in inside a special cavity made on the hinge body or comolded during the manufacturing phase. It is easy to realize how this involves further and dedicated working time, with an further cost and also with a greater complexity of the automatic assembly line or in any case of logistics management.

Furthermore, it should be considered that, depending on the material the cup is made of (i.e. whether it is made of metal or plastic), the assembly method changes, and therefore the corresponding automatic line to be used for assembling the hinges also changes, as well as the fastening screw to be used. In light of this, the hinge manufacturer must equip itself with two different automatic hinge assembly lines, or in any case with different work stations, depending on the material the flanged container of the hinges to be assembled is made of.

An example of a concealed hinge of a known type is described and illustrated in EP2172610.

OBJECTS OF THE INVENTION

The object of the invention is to propose a concealed hinge that allows to overcome, at least in part, the drawbacks of the known solutions.

Another object of the invention is to reduce the manufacturing and assembly costs of concealed hinges.

Another object of the invention is to propose a hinge that can be produced simply, quickly and at low cost.

Another object of the invention is to propose a hinge that can be assembled easily, quickly and at low cost.

Another object of the invention is to propose a hinge with a production cost significantly lower than similar traditional hinges.

Another object of the invention is to propose a hinge that can be assembled in the same way even in the case of containment structures made of different materials, for example metal or plastic. Another object of the invention is to propose a hinge that uses the same components for fastening each insert to the respective containment structure, even in the case of containment structures made of different materials, for example metal material or plastic material.

Another object of the invention is to propose a hinge that can be in any case manufactured or assembled on the same line, or in any case with the same work station or equipment, both in the case of containment structures made of metallic material and in the case of containment structures made of plastic material.

Another object of the invention is to propose a hinge that allows for a reduction in the number of processes required for the production of the hinge itself.

Another object of the invention is to propose a hinge that reduces/eliminates the risk of surface/aesthetic defects during the production phase of the hinge itself.

Another object of the invention is to propose a hinge that allows greater stability in fastening the insert to the corresponding containment structure, and in particular that reduces or eliminates play in fastening the insert to the corresponding containment structure.

Another object of the invention is to propose a hinge that, once installed in the jamb and in the door, is aesthetically pleasing when visible.

Another object of the invention is to propose a hinge that has an alternative characterisation, both in terms of construction and functionality, compared to traditional hinges.

Another object of the invention is to propose a method of assembling a concealed hinge that is particularly convenient from an economic point of view.

Another object of the invention is to propose a method of assembling a concealed hinge that is simple, quick and low cost.

Another object of the invention is to propose a method of assembling a concealed hinge that is substantially the same regardless of the materials used to make the containment structures.

Another object of the invention is to propose a method of assembling a concealed hinge that requires the same components and the same equipment even in the case of containment structures made of different materials, for example metal material or plastic material.

SUMMARY OF THE INVENTION

All the objects mentioned herein, considered either individually or in any combination thereof, and others which will result from the following description are achieved, according to the invention, with a hinge according to claim 1 and with a method according to claim 27.

The present invention relates to a concealed hinge for articulating a door leaf with respect to said fixed structure, preferably of a door with respect to a jamb/door frame, said concealed hinge comprises:

- a first containment structure configured and intended to be inserted within a first cavity obtained in said door,

- a first insert configured to be inserted and housed within said first containment structure,

- first fastening means for binding said first insert to the first containment structure,

- a second containment structure configured and intended to be inserted within a second cavity created in the fixed structure,

- a second insert configured to be inserted and housed within said second containment structure,

- an articulation device connecting to each other said first insert and said second insert to allow rotation of the door with respect to said fixed structure,

- second fastening means for binding said second insert to the second containment structure, and characterized in that:

- in said first containment structure and/or in said second containment structure at least one unthreaded seat is obtained,

- said first fastening means and/or said second fastening means comprise at least one self-tapping screw,

- each self-tapping screw is configured to pass through said first insert and/or said second insert respectively and to be screwed into a corresponding said unthreaded seat obtained respectively in said first containment structure and/or in said second containment structure, to thereby respectively bind said first insert to the first containment structure and/or said second insert to the second containment structure.

The present invention also relates to a method of assembling a concealed hinge comprising:

- a first containment structure which is configured and intended to be inserted within a first cavity made in the door,

- a first insert configured to be inserted and housed within said first containment structure, - first fastening means of for binding said first insert to the first containment structure,

- an articulation device which connects said first insert and said second insert to each other to allow rotation of the door with respect to said fixed structure, and characterized in that:

- to bind said first insert to the first containment structure and/or said second insert to the second containment structure, a self-tapping screw is screwed which, after having passed through said first insert and/or said second insert respectively, it is screwed into a unthreaded seat obtained respectively in said first containment structure and/or in said second containment structure, thus creating by means of said self-tapping screw a corresponding thread in said seat.

DETAILED DESCRIPTION OF THE FIGURES

The present invention is further clarified below in some of its preferred examples of practical implementation reported for purely illustrative and non-limiting purposes with reference to the attached drawings, wherein:

Figure 1 shows an exploded perspective view of a hinge according to the invention in a first embodiment,

Figure 2 shows a view - according to a section plane X1 - Z1 - of the first containment structure of the hinge of Figure 1 with the first insert of the hinge of Figure 1 inserted/positioned within it,

Figure 3 shows the same view as Figure 2 following the application of the selftapping screws to bind the first insert to the first containment structure, figure 4 shows a view - according to a section plane X2 - Z2 - of only the second containment structure of the hinge of Figure 1 with the second insert of the hinge of Figure 1 inserted/positioned within it,

Figure 5 shows the same view as Figure 4 following the application of the selftapping screws to bind the second insert to the second containment structure,

Figure 6 shows an exploded perspective view of a hinge according to the invention in a second embodiment,

Figure 7 shows an exploded perspective view of a hinge according to the invention in a third embodiment, Figure 8 shows a perspective view of a self-tapping screw that can be used in the hinge according to the invention,

Figure 8A shows an enlarged detail of Fig. 8 corresponding to the self-tapping portion of the self-tapping screw shank.

DETAILED DESCRIPTION OF THE INVENTION AND OF SOME PREFERRED EMBODIMENTS

As can be seen from the figures, the present invention concerns a concealed hinge 1 for the articulation of a door with respect to said fixed structure, preferably - but not exclusively - of a door to a doorjamb.

The hinge 1 according to the invention comprises

- a first containment structure 10 configured to, and intended to, be inserted within a first cavity made in the door,

- a first insert 11 configured to be inserted and housed within said first containment structure 10,

- first fastening means 12 for binding said first insert 11 to the first containment structure 10,

- a second containment structure 20 configured to, and intended to, be inserted within a second cavity formed in said fixed structure,

- a second insert 21 configured to be inserted and housed within said second containment structure,

- second fastening means 22 for binding said second insert 21 to the second containment structure 20,

- an articulation device 30 which connects said first insert 11 and said second insert 21 to each other to allow rotation of the door with respect to said fixed structure, and wherein:

- in said first containment structure 10 and/or in said second containment structure 20 at least one unthreaded seat 40 is obtained,

- the first fastening means 12 and/or said second fastening means 22 comprise at least one self-tapping screw 50,

- each self-tapping screw 50 is configured to pass through said first insert 11 and/or said second insert 21 respectively and to be screwed into a corresponding said unthreaded seat 40 obtained respectively in said first containment structure 10 and/or in said second containment structure 20, to thus bind respectively said first insert 11 to the first containment structure 10 and/or said second insert 21 to the second containment structure 20. In particular, the hinge 1 is of the concealed type as it is invisible when the door is closed.

Preferably, the hinge 1 is of the type that allows rotation movements of the door up to approximately 180° with respect to the fixed structure.

It is specified that hereinafter the “closed” condition of hinge 1 (or of the door) means the condition wherein the door is closed and the two containment structures face each other. Instead, the “open” condition of hinge 1 (or of the door) means the condition wherein the two containment structures 10, 20 no longer face each other.

Furthermore, “opening the hinge or door” means rotating the door to make the hinge 1 go from the closed condition to the open condition. Correspondingly, “closing the hinge or door” means rotating the door to bring the hinge 1 back from the open condition to the closed condition.

Each self-tapping screw 50 is screwed into a corresponding unthreaded seat 40 which extends longitudinally along the direction of insertion/recessing of the first containment structure 10 and/or the second containment structure 20 within the respective slot.

It is specified that hereinafter, height/depth means the development of the element (containment structure or insert) along the Z insertion direction of the same within the door or jamb, length means the development of the element (containment structure or insert) along an X direction which is perpendicular to Z and is parallel to the hinge axis, width means the development of the element (containment structure or insert) along a Y direction which is perpendicular to both Z and X. In particular, it is such that:

- the first containment body 10 and/or the first insert 11 develops in depth along the Z1 direction of insertion/recessing within the door, develops in length along a direction X1 which is perpendicular to Z1 and is parallel to the hinge articulation axis, and develops in width along a direction Y1 which is perpendicular to both Z1 and X1 ,

- the second containment body 20 and/or the second insert 21 develops in depth along the Z2 direction of insertion/recessing within the fixed structure (in particular the jamb), develops in length along a direction X2 which is perpendicular to Z2 and is parallel to the hinge axis, and develops in width along a direction Y2 which is perpendicular to both Z2 and X2.

Conveniently, the first containment structure 10 and/or the second containment structure 20 is/are (before screwing in said self-tapping screws 50) completely free of threads. Advantageously, this allows the pre-threading station/phase of the seats to be avoided during the production/assembly of the hinge 1.

Preferably, each self-tapping screw 50 is screwed into a corresponding unthreaded seat 40 which extends longitudinally along the depth direction, Z1 and Z2 respectively, of the corresponding containment bodies 10 and 20. In particular, each self-tapping screw 50 is screwed into a corresponding unthreaded seat 40 by rotating it on itself around an axis which extends longitudinally along the depth direction, Z1 and Z2 respectively, of the corresponding containment bodies 10 and 20.

Conveniently, in the closed condition, the first containment structure 10 and the second containment structure 20 define, in combination with each other, a chamber wherein the first insert 11 , the second insert 21 and the articulation device 30 are enclosed.

Preferably, the articulation device 30 comprises at least two arms 31 , 32 shaped like a rocker arm and associated with said inserts 11 , 21 so as to allow rotation of the door with respect to said fixed structure.

Preferably, the articulation device 30 is configured to be engaged - and in particular articulated - directly to the first insert 11 and the second insert 21 .

Preferably, the first containment structure 10 and/or the second containment structure 20 can be made of polymeric material, more preferably thermoplastic or plastic material, for example Nylon (PA6, PA66, PA12 and all their similar products) or acetal resin (POM and all their similar products), which can in turn be added in variable percentages with inserts (shaped like fibres or spheres) in glass, Kevlar or carbon.

For example, the two containment structures 10 and/or 20 can be made of plastic by molding, preferably in a thermoplastic resin based on polyarylamide (for example IXEF®). This material is particularly advantageous as it has high mechanical resistance characteristics (similar to those of metals) and, at the same time, allows to eliminate the need to carry out surface finishing processes on the molded product. For example, the final coloring of the hinge can be obtained simply by adding appropriate colorants inside the material before molding, thus avoiding the need to color the hinge components once they have been molded.

Preferably, the first containment structure 10 and/or the second containment structure 20 can be made of metallic material, even in metal alloy, more preferably in aluminium, bronze, brass or in light alloys, for example in zinc alloy (zama) or aluminium.

Preferably, the first containment structure 10 and/or the second containment structure 20 can be made by die-casting a metallic material or metallic alloy. Preferably, the first containment structure 10 and/or the second containment structure 20 can be made of folded sheet metal.

Preferably, the first insert 11 and/or the second insert 21 and/or the articulation device 30 can be made of polymeric material, more preferably thermoplastic or plastic material as for the containment structures 10/20, for example in Nylon (PA6, PA66, PA12 and all their similar products) or acetal resin (POM and all its similar products) or thermoplastic resin based on polyarylamide (for example IXEF®), which can in turn be added in variable percentages with inserts (shaped like fibres or spheres) in glass, Kevlar or carbon, or it can be in metallic material, even metal alloy, more preferably in aluminium, bronze, brass or in light alloys, for example in zinc alloy (zama) or aluminium.

Preferably, the articulation device 30 can be manufactured using metal injection molding technology (so-called “M.I.M." or “metal injection molding").

Preferably, the first insert 10 and/or the second insert 21 and/or the articulation device 30 can be made of die-cast metal or metal alloy or of folded sheet metal.

Conveniently, the same type (both in terms of material and conformation, and in particular of thread) of self-tapping screw 50 is configured to be screwed into a corresponding unthreaded seat 40 obtained in a first containment structure 10 and/or in a second containment structure 20 which can be made of polymeric material, in particular thermoplastic or plastic material, or even metallic material, even metal alloy. Advantageously, this allows the same self-tapping screws 50 to be used, and also the same machines and equipment, in order to screw said screws into the unthreaded seats 40 of support structures 10, 20 made of different materials.

Preferably, each self-tapping screw 50 comprises, along its own longitudinal development direction, a head 51 with an underlying shank 52 which is provided on its external surface, at least at its tip (which is opposite to the head), with a self-tapping portion 53, i.e. of the type which - when screwed into said unthreaded seat 40 - creates a thread on the side walls that delimit the seat itself. Conveniently, the self-tapping screw 50 can then be screwed and unscrewed inside the thread thus created inside the seat 40. Conveniently, screwing the self-tapping screw 50 inside the unthreaded seat 40 creates a thread inside said seat and the interference engagement of the screw itself within the corresponding seat.

Advantageously, this allows to eliminate or in any case reduce the play, and in particular lateral play, due to the inevitable tolerances that instead exist in the screw- nut type coupling provided in the known solutions. Preferably, each self-tapping screw 50 is provided, for the majority or the entire development of its shank 52, with said self-tapping portion 53. Ideally, the majority or the entire shank 52 of the screw 50 is self-tapping.

Preferably, the tip of the shank 52 (tip which is defined by the end opposite to that connecting to the head 51) of the self-tapping screw 50 may be truncated or conical. Preferably, the tip of the shank 52 may comprise a narrowing in section with respect to the remaining part of the shank.

Preferably, the self-tapping screw 50 is made of metal, for example 8.8 - 10.9 - 12.9 steel, but it can also be made of stainless steel or other known steels suitable for the production of screws, and it can also be made of plastic/thermoplastic materials, for example Nylon (PA6, PA66, PA12 and all their similar products) or acetal resin (POM and all its similar products) or thermoplastic resin based on polyarylamide (for example IXEF®), which can in turn be added in variable percentages with inserts (shaped like fibres or spheres) in glass, Kevlar or carbon.

Preferably, the head 51 of the self-tapping screw can be cylindrical, hexagonal (or in any case prism-shaped), domed (round) or countersunk. Preferably, the head 51 of the self-tapping screw 50 can be provided with an engraving and recess for screwdrivers of various shapes, or for a hexagonal, Torx, Torx Plus or AutoSert system type of drive. Preferably, the self-tapping screw 50 can be provided with a washer prestamped with the head.

Preferably, each self-tapping screw 50 may be of the type that is produced and/or marketed by the EJOT company, for example under the trade names EVO PT®, DELTA PT® and/or ALtracs® Plus. Preferably, the self-tapping screw 50 may be of the type that is produced and/or marketed by the EJOT company for direct assembly in thermoplastic material or metals.

Preferably, each self-tapping screw 50 may have a head diameter 51 of approximately 5 - 10 mm, more preferably approximately 8 - 9 mm.

Preferably, each self-tapping screw 50 may have a nominal thread diameter of the shank 52 of approximately 4 - 8 mm, more preferably approximately 5 - 6 mm.

Preferably, each self-tapping screw 50 may have a shank 52 with a length of approximately 8 - 20 mm, more preferably approximately 11 - 16 mm.

Preferably, each self-tapping screw 50 may have a self-tapping portion 53 of length of about 8 - 20 mm, more preferably about 11 - 16 mm.

Preferably, each self-tapping screw 50 may have a thread pitch of approximately 1 - 2 mm, more preferably approximately 1.5 - 2 mm. Preferably, the tightening torque of each self-tapping screw 50 is greater than 2.5 Nm, more preferably it can be approximately 3 - 7 Nm, ideally it can be approximately 4.5 - 6.5 Nm. Advantageously, this allows the use of conventional industrial pneumatic screwdrivers.

Preferably, each self-tapping screw 50 is not of the metric type and, advantageously, this allows for significant cost savings resulting from the elimination of the machining required for the use of metric screws.

Preferably, each self-tapping screw 50 comprises a self-tapping portion 53 provided with a thread with an angle of a flank 55 (at the peak) less than 60°, preferably of about 20 - 35°, for example of about 33°. Conveniently, the two sides 54', 54" of the same flank 55 can have inclinations (defined with respect to the peak/top) that are different from each other, and for example the upstream side 54' has a lower inclination than the downstream side 54". In a possible embodiment, for example, the upstream side 54' has an inclination of about 11 ° while the downstream side 54" has an inclination of about 22°.

Advantageously, this allows for a reduction in stress in the radial direction. Preferably, the helix angle is configured to maximize the clamping force without compromising the strength of the contacting parts. Preferably, the thread pitch allows to reduce the insertion depths of the screw 50, resulting in a reduction in cost and space requirements.

Conveniently, in one possible embodiment, each self-tapping screw 50 may be self-drilling. Conveniently, in one possible embodiment, each self-tapping screw 50 may be self-threading.

Preferably, said first fastening means 12 of the first insert 11 to the first containment structure 10 comprise only self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in said first containment structure 10. In particular, in a possible embodiment illustrated in the figures, the first fastening means 12 comprise two self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in said first containment structure 10.

Preferably, said second fastening means 22 of the second insert 21 to the second containment structure 20 comprise only self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in said second containment structure 20. In particular, in a possible embodiment illustrated in the figures, the second fastening means 22 comprise two self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in said second containment structure 20.

Preferably, the first fastening means 12 of the first insert 11 to the first containment structure 10 consist exclusively of self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in the corresponding containment structure. In particular, to bind the first insert 11 to the first containment structure 10, exclusively self-tapping screws 50 are used.

More preferably, said first containment structure 10 is provided with exclusively unthreaded seats 40 and, in particular, at least two unthreaded seats 40 are provided, each of which is intended to receive a self-tapping screw 50. Ideally, said first containment structure 10 is completely free of threads, and in particular is free of threaded seats, threaded areas and threaded parts.

Preferably, the second fastening means 22 of the second insert 21 to the second containment structure 20 consist exclusively of self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in the corresponding containment structure. In particular, to bind the second insert 21 to the second containment structure 20, exclusively self-tapping screws 50 are used.

More preferably, said second containment structure 20 is provided with exclusively unthreaded seats 40 and, in particular, at least two unthreaded seats 40 are provided, each of which is intended to receive a self-tapping screw 50. Ideally, said second containment structure 20 is completely free of threads, and in particular is free of threaded seats, threaded areas and threaded parts.

Preferably, in one possible embodiment, the first containment structure 10 comprises at least one unthreaded seat 40 for a self-tapping screw 50, more preferably two unthreaded seats 40, and also the second containment structure 20 comprises at least one unthreaded seat 40 for a self-tapping screw 50, more preferably two unthreaded seats 40.

Preferably, in a possible embodiment, the first fastening means 12 comprise at least one self-tapping screw 50, preferably at least two self-tapping screws 50, and wherein also said second fastening means 22 comprise at least one self-tapping screw 50, preferably at least two self-tapping screws 50.

Ideally, in a possible embodiment illustrated in the figures, the first fastening means 12 consist of two self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in the corresponding containment structure, and the second fastening means 22 consist of two self-tapping screws 50, each of which is screwed into a corresponding unthreaded seat 40 obtained in the corresponding containment structure.

Preferably, each unthreaded seat 40 includes a cavity 41 , which may be blind or through, which is free of internal threads on the internal walls. More preferably, the walls of the cavity 41 are substantially smooth.

Preferably, said unthreaded seat 40 is defined by a unthreaded or pre-threaded cavity 41. Ideally, said cavity 41 has a substantially cylindrical shape. Ideally, said cavity 41 has the same cross-section (both in terms of shape and dimensions) along its longitudinal development corresponding to the depth direction, respectively Z1 for the first containment structure 10 and Z2 for the second containment structure. Conveniently, the cavity 41 of each unthreaded seat 40 has a depth extension equal to or less than the self-tapping portion 53 of the corresponding self-tapping screw 50.

Preferably, each unthreaded seat 40 is configured so that the corresponding self-tapping screw 50, while screwing into said unthreaded seat, engages by interference (interference fit) in that location.

Preferably, the first insert 11 comprises at least one first passage 13 for the pass through of a corresponding self-tapping screw 50. In particular, said at least one first passage 13 is configured to allow the pass through of the shank 52 of a corresponding self-tapping screw 50 and to prevent the pass through of the head 51 of said screw. Preferably, said first passage 13 comprises at least one first through opening 13'. Preferably, said first passage 13 comprises two (or more) first through openings 13' facing each other and superimposed along the pass through direction of the selftapping screw. Preferably, said at least one first through opening 13' has a crosssection with a closed profile. Preferably, said at least one first through opening 13' can have a cross-section with a laterally open profile, for example with a substantially “C” or “U” shaped profile.

Preferably, two first through openings 13' can be superimposed to and spaced apart from each other so that the head 51 of a self-tapping screw 50 can be inserted laterally between them.

Preferably, the second insert 21 comprises at least one second passage 23 for the pass through of a corresponding self-tapping screw 50. In particular, said at least one second passage 23 is configured to allow the pass through of the shank 52 of a corresponding self-tapping screw 50 and to prevent the pass through of the head 51 of said screw. Preferably, said second passage 23 comprises a second through opening 23'. Preferably, said first second through opening 23' has a cross-section with a closed profile. Preferably, said second through opening 23' can have a cross-section with a closed and slotted profile.

Preferably, each self-tapping screw 50 is screwed into a corresponding unthreaded seat 40 obtained in the first containment structure 10 until the head 51 of the self-tapping screw abuts the upper/external area of the first insert 11 which surrounds each first passage 13 of said first insert which is crossed by the shank 52 of the screw itself.

Preferably, each self-tapping screw 50 is screwed into a corresponding unthreaded seat 40 obtained in the second containment structure 20 until the head 51 of the self-tapping screw abuts the upper/external area of the second insert 21 which surrounds each second passage 23 of said second insert which is crossed by the shank 52 of the screw itself.

Preferably, each self-tapping screw 50 - when screwed into said unthreaded seat 40 - is completely housed inside the first and/or second containment structure 10, 20.

Preferably, the first insert 11 can be made in a single piece or in multiple pieces configured to be mechanically associated with each other so as to define said first insert to be inserted and bound in the first containment structure.

Preferably, the second insert 21 can be made in a single piece or in multiple pieces configured to be mechanically associated with each other so as to define said second insert to be inserted and bound in the second containment structure.

Preferably, the position of the first insert 11 is adjustable within the first containment structure 10.

Preferably, the position of the second insert 21 is adjustable within the second containment structure 20.

Preferably, said first containment structure 10 and/or said second containment structure 20 can be made in a single piece.

Conveniently, in a possible embodiment, the containment structures 10, 20 comprise respectively two flanged containers, both preferably cup-shaped, which are recessed into the thickness of the door and the jamb respectively, and two corresponding inserts which are housed - and preferably adjustable - within the respective flanged containers. In particular, the first flanged container is configured and intended to be inserted inside a first recess obtained in the door, while the second flanged container is configured and intended to be inserted inside a second recess obtained in the fixed structure. Preferably, each containment structure 10, 20 comprises two terminal flanges 80' and 80" separated from each other, along the direction of their respective length (i.e. X1 and X2 respectively), by a depressed portion 81 (which is in fact depressed with respect to the level of the terminal flanges) and which is configured to house, at least in part, the corresponding insert 11 , 21. In particular, the depressed portion 81 comprises a bottom which, along the respective direction of the depth in the direction of the recess (i.e. Z1 and Z2 respectively), is located (at one or more levels) below said two terminal flanges 80' and 80".

Preferably, each unthreaded seat 40 is formed on a bottom area of said depressed portion 81. More preferably, the depressed portion 81 may comprise a bottom with a first area 83 and with at least one second area 84', 84", wherein the first area is located at a greater depth than the second area. Preferably, the depressed portion 81 comprises two second areas 84' and 84", which are located at substantially the same depth, and which are separated from each other by a first area 83 which is located at a greater depth than that of said second areas. Preferably, each second area 84' and 84" is provided at a respective terminal flange 80' and 80". In essence, in a possible embodiment, each second bottom area 84', 84" of the depressed portion 81 acts as a step connection between a respective terminal flange 80', 80" and the first bottom area 83 of the depressed portion 81.

Preferably, said unthreaded seat 40 is obtained at said second bottom area 84', 84" of the depressed portion 81. Preferably, in each of said second bottom areas 84' and 84" of the depressed portion 81 a corresponding unthreaded seat 40 is obtained for screwing in a self-tapping screw 50.

Preferably, the two terminal flanges 80', 80" - which are positioned on opposite sides of the depressed portion 81 along the length direction of the respective containment structure 10, 20 - are intended to interact with and/or house fastening means (not shown) of the corresponding containment structure to the door and the jamb respectively. Preferably, the terminal flanges 80', 80" have a substantially flat development.

Preferably, each containment structure 10, 20 may comprise two walls 85' and 85", opposite to each other and spaced along the width direction of the corresponding container.

Preferably, the depressed portion 81 of the containment structures 10, 20 can have a substantially parallelepiped shape. Preferably, the depressed portion 81 is obtained at the center of the corresponding containment structure 10, 20. Preferably, the containment structures 10, 20 - and more preferably the two flanged containers that define said structures - can have substantially the same shape.

Conveniently, the inserts 11 , 21 are configured to engage, directly or indirectly, part of the articulation device 30.

Preferably, each insert 11 , 21 comprises two sides 90' and 90" opposite/facing each other and spaced along the corresponding length direction (i.e. along X1 and X2 respectively). Conveniently, in a possible embodiment, the two sides 90' and 90" can be connected to each other by at least one wall and, in particular, by a side wall 91 that extends along a plane defined in the length and depth directions and/or by a bottom wall 92 that extends along a plane defined in the length and width directions. Conveniently, said side wall 91 and/or said bottom wall 92 can be made in a single piece with the sides 90', 90" or can be mechanically associated with the latter.

Conveniently, on the external side of each of the two sides 90', 90" of the first insert 11 , a first appendix 15 can be provided wherein said at least one first passage 13 is obtained for the pass through of a corresponding self-tapping screw 50.

Conveniently, on the external side of each of the two sides 90', 90" of the second insert 21 , a second appendix 25 can be provided wherein said at least one second passage 23 is obtained for the pass through of a corresponding self-tapping screw 50.

Preferably, when the insert 11 , 21 is inserted inside the corresponding containment structure 10, 20, the corresponding appendix 15, 25 of the insert abuts at the bottom of a respective second zone 84', 84" at the bottom of the depressed portion 81 , while at the top (always according to the direction of the depth) it is located below or substantially flush with the level of the respective terminal flange 80', 80".

Advantageously, for

Conveniently, the two containment structures 10, 20 can have any shape of traditional type.

Conveniently, the two inserts 11 , 21 can have any shape of traditional type.

Conveniently, each insert 11 , 21 is housed within the corresponding containment structure 10, 20 and is movable with respect to the latter for adjustment of the position of the hinge.

Advantageously, in order to adjust the position of at least one of the two inserts 11 and 21 along the width direction, the hinge 1 can be provided with a mechanism such as the one described and illustrated for example in EP3130732.

In one possible embodiment, one of the two containment structures may have a greater length and a smaller width than the other containment structure. In one possible embodiment, one of the two containment structures may have a smaller height/depth than the other containment structure. In another possible embodiment, the two containment structures may have substantially the same dimensions in terms of width and depth, and preferably also of length.

Furthermore, in a possible embodiment, on the terminal flanges 80', 80" of each of the two containment structures 10, 20 further holes are made, respectively 86' and 86", for the pass through of screws (not shown) for the stable fastening of the containment structures 10, 20 inside the respective recess. Conveniently, in a possible embodiment, on the terminal flanges 80' and 80" of the first containment structure 10 further holes 86' are made which are slotted and can be passed through by screws for the stable fastening of the first containment structure 10 inside the respective recess made in the door. These further holes 86' which are slotted develop along the direction X1 and allow the position of the first containment structure 10 to be adjusted within the built in recess made in the door and therefore to adjust the door along this direction. On the terminal flanges 80' and 80" of the second containment structure 20 intended to be recessed into the jamb, further holes 86" are made, which are substantially circular and can be passed through by screws for the stable fastening of the second containment structure 20 inside the respective built in recess made in the jamb.

Furthermore, on the terminal flanges 80', 80" of each of the two containment structures 10, 20, recessed sections 87 can be obtained for the interlocking coupling of the teeth of cover plates. Conveniently, the plates have a thickness such that, once applied, they are flush with the respective surfaces of the door and the jamb.

As stated, the connection between the two inserts 11 and 21 can be obtained in a traditional way by means of an articulation device 30 with at least two arms 31 , 32, preferably shaped like a rocker arm. In a possible embodiment, the articulation device 30 can comprise three arms, shaped like a rocker arm, of which a first arm 31 is central and two second arms 32 are external; preferably, the two external arms 32 between which the first central arm 31 is inserted, can be connected to each other by a common section and thus define a fork shape. Conveniently, the arms 31 and 32 can be a single lever or two or more levers articulated to each other.

Preferably, in a possible embodiment illustrated for example in figure 1 , the first arm 31 is a double lever, and in particular comprises a first lever 3T which is articulated with one end to the first insert 11 at a pin, is articulated with the central portion to the other arm 32 at a common pin, and with the other end is articulated to a second lever 31" which in turn is articulated to the second insert 21. Correspondingly, the second arm 32 is articulated with one end to the second insert 21 at a pin, is articulated with the central portion to the first lever 3T of the first arm 31 at the common pin, and slides with the other end along a guide obtained in the first insert 11 . Conveniently, to perform the articulation of the door with respect to the jamb, in the transition from the closed to the open configuration, the arms 31 and 32 of the hinge 2 rotate around their respective articulation pins, and around the common articulation pin, and the articulation angle defined between the two levers 31 ' and 31" of the first arm 31 varies while the nonarticulated end of the second arm 32 slides along the guide of the first insert 11 .

Preferably, in possible embodiments illustrated for example in figures 6 and 7, the first arm 31 is articulated with one end to the first insert 11 at a pin, is articulated with the central portion to the other arm 32 at a common pin, and is slidable with the other end along a guide obtained in the second insert 21 . Correspondingly, the second arm 32 is articulated with one end to the second insert 21 at a pin, is articulated with the central portion to the other arm 31 at the common pin, and is slidable with the other end along a guide obtained in the first insert 11 . To perform the articulation of the door with respect to the jamb, in the transition from the closed to the open configuration, the arms 31 and 32 of the hinge 1 rotate around the respective articulation pins, and around the common articulation pin, as well as the respective non-articulated ends slide along the respective guides. Preferably, in one possible embodiment, the guide can have a profile such that during the opening and closing phase of the door, it is subjected to a particular composite movement, which avoids interference with the edge of the side of the jamb.

Conveniently, in a possible embodiment not shown here, the containment structures 10, 20 can be made of sheet metal as described and illustrated for example in 1020150006061 and EP3362623.

Conveniently, in a possible embodiment not shown here, the inserts 11 , 21 and/or the articulation device 30 can be made of sheet metal as described and illustrated for example in 1020150006061 and EP3362623.

Preferably, in a possible embodiment (see for example Fig. 7), said first containment structure 10 and/or said second containment structure 20 can be made from multiple pieces, and - in particular - can comprise at least a first piece 70' and at least a second piece 70" which are connected to each other by at least one further selftapping screw 60.

Preferably, said first 10 and/or second containment structure 20 comprises a first piece 70' wherein at least one further unthreaded seat 45 is obtained and said hinge 1 comprises at least one further self-tapping screw 60 which is configured to pass through a second piece 70" of said containment structure 10, 20 and then be screwed into a corresponding further unthreaded seat 45 obtained in said first piece 70', to thus bind said two pieces 70', 70" of the same containment structure together. Conveniently, said further unthreaded seat 45 has the same characteristics as said unthreaded seat 40. Conveniently, said further self-tapping screw 60 has the same characteristics as said self-tapping screw 50. In a possible embodiment such as that illustrated in Figure 7, two second pieces 70" are provided, substantially shaped like a plate with a rounded external edge, each of which is crossed by two further self-tapping screws 60 which are configured and intended to be screwed into corresponding further unthreaded seats 45 obtained in the flanged end portions of a first piece 70', which is centrally shaped like a cup, to thus define a substantially flat terminal flange of said second containment structure 20.

The present invention also relates to a method of assembly of a concealed hinge 1 comprising:

- a first containment structure 10 which is configured and intended to be inserted within a first cavity made in the door,

- a second containment structure 20 configured and intended to be inserted within a second cavity created in the fixed structure,

- a second insert 21 configured to be inserted and housed within said second containment structure 20,

- an articulation device 30 which connects said first insert 11 and said second insert 21 to each other to allow rotation of the door with respect to said fixed structure.

Said method of assembly is characterised in that to bind said first insert 11 to the first containment structure 10 and/or said second insert 21 to the second containment structure 20, a self-tapping screw 50 is screwed which, after having passed through said first insert 11 and/or said second insert 21 respectively, is screwed into a unthreaded seat 40 obtained respectively in said first containment structure 10 and/or in said second containment structure 20, thus creating by means of said selftapping screw 50 a corresponding thread in said seat 40.

Preferably, said first containment structure 10 and/or said second containment structure 20 are completely free of threads or threaded seats. Preferably, said method provides for the use of only self-tapping screws 50 to bind said first insert 11 to the first containment structure 10 and said second insert 21 to the second containment structure 20.

Preferably, said method involves screwing self-tapping screws 50 of the same type (both in terms of material and shape, and in particular of threading) into corresponding unthreaded seats 40 obtained in containment structures 10, 20 made of polymeric material, more preferably in thermoplastic or plastic material, and also in containment structures 10, 20 made of metallic material, even in metallic alloy.

Advantageously, this allows the machine which is designed to apply said at least one self-tapping screw 50 to be equipped and configured in a unique way - and independently of the material of the containment structure - so that, after having passed through the respective insert 11 , 21 , the self-tapping screw is screwed into an unthreaded seat 40 obtained in the respective containment structure 10, 20, thus creating a corresponding thread in said seat by means of said self-tapping screw.

From what has been said, it is clear that the concealed hinge according to the invention is much more advantageous than traditional concealed hinges, since, while obtaining substantially similar performance, it has significantly lower production costs and this mainly derives from the fact that it is not necessary to obtain any pre-threading in the containment structures of the hinge itself, thus avoiding the work phase required to carry out the threading process. In particular, the solution according to the invention avoids having to provide a pre-threading machine or station in the automatic line or having to handle the piece, or manage it from a logistical point of view, in the case of pre-threading carried out off-line.

The solution according to the invention can be implemented in traditional systems, with the advantage, however, of eliminating the pre-threading phase/station (carried out in line or externally), as provided in traditional solutions, of each seat which is obtained in the containment structure to receive - through a screw-nut type coupling - a corresponding screw for binding each insert to the respective containment structure. In particular, even if the pre-threading phase/station (carried out in line or externally) of each seat is eliminated, the remaining machinery and equipment remain the same as in traditional systems, and also the tightening torque for the self-tapping screw remains substantially the same as foreseen for the screw-nut coupling.

Conveniently, the same type of self-tapping screw can be used for containment structures made of different materials, and in particular both for containment structures made of polymeric material (in particular thermoplastic or plastic material) and for containment structures made of metallic material. Advantageously, this allows the machine/work station to be equipped in the same/unique way, without having to introduce variations or adaptations depending on the material of the containment structure.

Advantageously, the absence of pre-threads reduces the time needed to prepare the molds with which the hinges are made. Furthermore, by avoiding the pre-threading of the seats, the use of oil or lubricant is avoided, which could dirty the piece and generate problems during the finishing phase. In this way, the realization of the hinge is also more eco-sustainable and simplifies the process of cleaning the components.

Furthermore, advantageously, the solution according to the invention - wherein the self-tapping screw engages/screws by interference into an unthreaded seat obtained in the support structure - allows for a more stable engagement and hold of said self-tapping screw within said seat, thus eliminating the typical play of the screw- nut coupling provided in traditional solutions.

The present invention has been illustrated and described in some of its preferred embodiments, but it is understood that executive variations may be made, without however departing from the scope of protection of the present patent for industrial invention.

Claims

C L A I M S

1. Concealed hinge (1) of articulation of a door with respect to a fixed structure, preferably of a door with respect to a door jamb, said hinge comprising:

- a first containment structure (10) configured to be inserted within a first cavity made in the door,

- a first insert (11) configured to be inserted and housed within said first containment structure (10),

- first fastening means (12) to bind said first insert (11) to the first containment structure (10),

- a second containment structure (20) configured to be inserted within a second cavity obtained in said fixed structure,

- a second insert (21) configured to be inserted and housed within said second containment structure (20),

- second fastening means (22) to bind said second insert (21) to the second containment structure (20),

- an articulation device (30) which connects said first insert (11) and said second insert (21) to each other to allow rotation of the door with respect to said fixed structure, and characterized in that:

- in said first containment structure (10) and/or in said second containment structure (20) at least one unthreaded seat (40) is obtained,

- the first fastening means (12) and/or said second fastening means (22) comprise at least one self-tapping screw (50),

- each self-tapping screw (50) is configured to pass through said first insert (11 ) and/or said second insert (21) respectively and to be screwed into a corresponding said unthreaded seat (40) obtained respectively in said first containment structure (10) and/or in said second containment structure (20), to thus respectively bind said first insert (11) to the first containment structure (10) and/or said second insert (21) to the second containment structure (20).

2. Hinge according to claim 1 , wherein said first containment structure (10) and/or said second containment structure (20) is made of polymeric material, preferably plastic, more preferably a thermoplastic material.

3. Hinge according to claim 1 , wherein said first containment structure (10) and/or said second containment structure (20) is made of metallic material, even of metallic alloy.

4. Hinge according to one or more of the preceding claims, wherein each selftapping screw (50) is screwed into a corresponding unthreaded seat (40) which extends longitudinally along the direction of insertion/recessing of the first containment structure (10) and/or of the second containment structure (20) within the respective recess.

5. Hinge according to one or more of the preceding claims, wherein each unthreaded seat (40) comprises a cavity (41 ), blind or through, which is free of internal thread on the internal walls.

6. Hinge according to one or more of the preceding claims, wherein:

- the first insert (11 ) comprises at least a first passage (13) which is configured to allow the pass through of the shank (52) of a corresponding self-tapping screw (50) and to prevent the pass through of the head (51 ) of said screw, and/or

- the second insert (21 ) comprises at least one second passage (23) which is configured to allow the pass through of the shank (52) of a corresponding selftapping screw (50) and to prevent the pass through of the head (51 ) of said screw.

7. Hinge according to one or more of the preceding claims, wherein:

- said first containment structure (10) comprises at least one unthreaded seat (40) for a self-tapping screw (50), and

- said second containment structure (20) comprises at least one unthreaded seat (40) for a self-tapping screw (50).

8. Hinge according to one or more of the preceding claims, wherein:

- said first containment structure (10) comprises two unthreaded seats (40) each intended to receive a self-tapping screw (50)

- said second containment structure (20) comprises two unthreaded seats (40) each intended to receive a self-tapping screw (50).

9. Hinge according to one or more of the preceding claims, wherein in said first containment structure (10) exclusively unthreaded seats (40) are obtained.

10. Hinge according to one or more of the preceding claims, wherein said first containment structure (10) is completely free of threads.

11 . Hinge according to one or more of the preceding claims, wherein in said second containment structure (20) exclusively unthreaded seats (40) are obtained.

12. Hinge according to one or more of the preceding claims, wherein said second containment structure (20) is completely free of threads.

13. Hinge according to one or more of the preceding claims, wherein said first fastening means (12) comprise at least one self-tapping screw (50), preferably at least two self-tapping screws (50), and wherein said second fastening means (22) also comprise at least one self-tapping screw (50), preferably at least two self-tapping screws (50).

14. Hinge according to one or more of the preceding claims, wherein said first fastening means (12) consist of at least one self-tapping screw (50).

15. Hinge according to one or more of the preceding claims, wherein said second fastening means (22) consist of at least one self-tapping screw (50).

16. Hinge according to one or more of the preceding claims, wherein said first fastening means (12) consist of two self-tapping screws (50) and wherein said second fastening means (22) consist of two self-tapping screws (50).

17. Hinge according to one or more of the preceding claims, wherein the position of the first insert (11) is adjustable within the first containment structure (10) and/or the position of the second insert (21) is adjustable within the second containment structure (20).

18. Hinge according to one or more of the preceding claims, wherein each containment structure (10, 20) comprises two terminal flanges (80' and 80") separated from each other by a depressed portion (81) provided with a bottom which is located at a lower depth than that of said terminal flanges and which is configured to house, at least in part, the corresponding insert (11 , 21), and wherein said unthreaded seat (40) is obtained on a bottom area (84', 84") of said depressed portion (81).

19. Hinge according to one or more of the preceding claims, wherein each selftapping screw (50) comprises, along its own longitudinal development direction, a head (51) with an underlying shank (52) which is provided on its external surface, at least at its tip which is opposite to the head (51), with a self-tapping portion (53).

20. Hinge according to one or more of the preceding claims, wherein each selftapping screw (50) comprises a self-tapping portion (53) provided with a thread with a flank angle (55) lower than 60°, preferably approximately 20 - 35°.

21. Hinge according to one or more of the preceding claims, wherein each selftapping screw (50) comprises a self-tapping portion (53) wherein the two sides (54', 54") of the same flank (55) of said self-tapping portion (53) have inclinations that are different from each other.

22. Hinge according to one or more of the preceding claims, wherein each selftapping screw (50) is self-drilling or self-threading.

23. Hinge according to one or more of the preceding claims, wherein each selftapping screw (50), when screwed into said unthreaded seat (40), is completely housed inside the respective first and/or second containment structure (10, 20).

24. Hinge according to one or more of the preceding claims, wherein: - said first containment structure (10) and/or second containment structure (20) comprises a first piece (70') wherein at least one further unthreaded seat (45) is obtained,

- comprises at least one further self-tapping screw (60) which is configured to pass through a second piece (70") of said containment structure (10, 20) and then be screwed into a corresponding further unthreaded seat (45) obtained in said first piece (70'), to thus bind said two pieces (70', 70") of the same containment structure together.

25. Hinge according to one or more of the preceding claims, wherein following the greater or lesser screwing of the self-tapping screws (50) inside the respective unthreaded seats (40) obtained in the respective containment structures (10, 20), the position along the depth direction of each insert (11 , 21) inside the respective containment structure (10, 20) is adjusted.

26. Hinge according to one or more of the preceding claims, wherein the tightening torque of each self-tapping screw (50) is greater than 2.5 Nm, preferably it is approximately 3 - 7 Nm.

27. Method of assembly of a concealed hinge (1), said hinge (1) comprising:

- a first containment structure (10) which is configured and intended to be inserted within a first recess made in the door,

- a second containment structure (20) configured and intended to be inserted within a second recess created in the fixed structure,

- an articulation device (30) which connects said first insert (11) and said second insert (21) to each other to allow rotation of the door with respect to said fixed structure, said method is characterised in that to bind said first insert (11) to the first containment structure (10) and/or said second insert (21) to the second containment structure (20) a self-tapping screw (50) is screwed which, after having passed through said first insert (11) and/or said second insert (21) respectively, it is screwed into an unthreaded seat (40) obtained respectively in said first containment structure (10) and/or in said second containment structure (20), thus creating by means of said self-tapping screw (50) a corresponding thread in said seat (40).

28. Method according to the previous claim, wherein, in the case of a first containment structure (10) and/or said second containment structure (20) made of polymeric material and in the case of a first containment structure (10) and/or said second containment structure (20) made of metallic material, even metal alloy, selftapping screws (50) of the same type are screwed into corresponding unthreaded seats (40) obtained in said first containment structure (10) and/or in said second containment structure (20).

29. Method according to one or more of claims 27 or 28, wherein to bind said first insert (11) to the first containment structure (10) and to bind said second insert (20) to the second containment structure (20) only self-tapping screws (50) are used and, in particular, self-tapping screws (50) of the same type are used.