Corner joint for door and window frames

Description

Technical field

[0001] The present invention relates to a corner joint for sections of door and window frames.

[0002] The joint in question is intended to be used mainly in the sector relating to the production of wooden door and window frames or accessories for door and window frames, in particular for rigidly fixing together two sections of a frame along the joining plane.

Background art

[0003] As is known, the frame of a door or window, which may or may not be associated with cladding mouldings made of metal or PVC, usually consists of several wooden sections the ends of which are fixed in pairs at the corners of the frame, by means of a corner joint provided with suitable connection means.

[0004] The sections thus assembled in the form of a surrounding frame may form either a casement, intended to be inset in a brickwork wall, or a leaf of a door or a window and, in this latter case, usually delimit a glazed surface.

[0005] The connection means mentioned above may be, in accordance with the known art, of various types and for example envisage providing on the joining face of a first section several shaped projections alternating with recesses which are able to mate with corresponding recesses and projections provided on the joining face of the other section.

[0006] The sections may be connected together at 90°, i.e. with a first section in contact laterally on the other one, or at 45°, i.e. with an inclined common face.

[0007] It is known, for example from the patents EP 370,334, FR 1,175,665, BE 903,745, US 1,793,185, US 4,183,187, GB 2,076,924, DE 29 27 942, to use connection means consisting of wedges or pins provided with widened portions, generally in the form of a dovetail, which can be inserted into seats formed on either side of the joining plane and provided with an undercut inside which the widened portions of the pins grip so as to retain rigidly together the two sections of the frame.

[0008] In greater detail, according to the teaching of EP 370 334, the pins are inserted transversely with respect the plane defined by the surrounding window or door frame, while according to the teaching of FR 1,175,665, the pins are inserted parallel to the plane of the surrounding window or door frame.

[0009] The joining face may be provided with further coupling or centring elements usually consisting of cylindrical pins and corresponding seats formed in the opposite faces of the two frame parts to be joined together.

[0010] The corner joints used hitherto, which use the connection means mentioned above, have in practice proved to have certain drawbacks.

[0011] One drawback consists in the poor seal provided by the connection means against water infiltration which, as is known, in the long term results in damage to the door or window.

[0012] Another drawback, which is common to all door and window frames, consists in the presence of the joining line between the sections which impairs the aesthetic appearance of the door or window.

[0013] To overcome the drawback mentioned above, in DE 20021743 U a sealing device for timber window frame is disclosed for sealing the joint between two frame sections connected at 90°.
This device comprises a joint element displaced between the two sections, and fixing elements, with which the joint element can be fixed to the frame sections. These fixing elements are placed in holes arranged on the joint element, for example in the form of dowels.

[0014] Nevertheless, this solution shows important drawbacks. In fact, this sealing device does not consent to obtain a strong grip of the frame sections, because it cannot prevent them to translate along the direction parallel to the insertion axis of the dowels.

[0015] That causes a release of the mechanical grip and a deformation of the window frame itself, which reduces its isolating properties and can damage the fixing elements.

[0016] Another drawback consists in the difficulty of centering the joint element on the frame sections and then inserting fixing elements.

Disclosure of the invention

[0017] In this situation, therefore, the object of the present invention is to eliminate the drawbacks of the prior art mentioned above, by providing a corner joint for sections of door and window frames, which ensures an optimum seal against atmospheric agents.

[0018] Another object of the present invention is to provide a corner joint which is able to fix rigidly together the sections of a door or window frame.

[0019] Another object of the present invention is to provide a corner joint which is operationally entirely effective and reliable.

[0020] A further object of the present invention is to provide a corner joint which is simple and inexpensive to manufacture.

[0021] A further object of the present invention is to provide a corner joint which is not aesthetically impaired by the presence of the line joining together the two faces of the sections of the door and window frames.

Brief description of the drawings

[0022] The technical features of the invention, in accordance with the abovementioned objects, may be clearly understood from the contents of the claims indicated below and the advantages thereof will emerge more clearly from the detailed description which follows, provided with reference to the accompanying drawings, which show a purely exemplary and non-limiting embodiment in which:

• Figure 1 shows a plan view of a first side of the two sections joined together by means of the corner joint according to the present invention;
• Figure 2 shows a plan view of a second side of the two sections joined together by means of the corner joint according to the present invention;
• Figure 3 shows a perspective view of the two sections joined together by means of the corner joint according to the present invention;
• Figure 4 shows an axonometric view of a first embodiment of a corner joint according to the invention;
• Figures 5a, 5b and 5c show, respectively, a perspective view, a front view and a side view of a detail of the joint according to Figure 4 consisting of first example of a corner connection;
• Figure 6 shows an axonometric view of a second embodiment of a corner joint according to the invention;
• Figures 7a, 7b show, respectively, a front view and a side view of a detail of the joint according to Figure 6 consisting of a second example of a corner connection;
• Figure 8 shows an axonometric view of a third embodiment of a corner joint according to the invention;
• Figures 9a, 9b show, respectively, a front view and side view of a detail of the joint according to Figure 8 consisting of a third example of a corner connection;
• Figure 10 shows an axonometric view of a fourth embodiment of a corner joint according to the invention;
• Figures 11a, 11b show, respectively, a front view and a side view of a detail of the joint according to Figure 10 consisting of a fourth example of a corner connection;
• Figure 12 shows an axonometric view of a fifth embodiment of the corner joint according to the invention;
• Figures 13a, 13b show, respectively, a front view and a side view of a detail of the joint according to Figure 12, consisting of a fifth example of a corner connection.

Detailed description

[0023] With reference to the attached drawings, 1 denotes overall the corner joint for sections of door and window frames according to the invention. This joint is intended for the assembly of wooden sections of any type and any shape in order to form wooden door and window frames suitable in particular for cladding with aluminium or PVC mouldings.

[0024] The corner joint 1 comprises in a manner conventional per se a first and a second section, indicated by 2 and 3, which are usually joined together in accordance with the known art by means of fixing means 4 along the respective joining faces 2', 3' of the sections.

[0025] The frame which is thus obtained usually has the form of a quadrangular surrounding frame formed by two uprights and two crosspieces which define a plane of lie. This plane is that in which the door or window frame is arranged and comprises an inner side and an outer side.

[0026] The fixing means 4 comprise a pair of first openings 5, 6 which are formed in opposite positions on the two faces 2', 3' of the two sections 2, 3 so as to form a seat 7 which extends on either side of the joining plane of the sections and which is able to receive a pin 8 which is shaped so as to match the seat 7 and positioned so as to connect together the said sections 2, 3.

[0027] In accordance with the idea forming the basis of the present invention, the joint 1 also comprises a connection element 9 which is arranged between the two sections 2, 3 along the joining plane and has second openings 10 positioned opposite and as a continuation of the first openings 2, 3.

[0028] The number of pairs of first openings 5, 6 (and corresponding second openings 10) and the type of fixing means 4 associated with the said first openings 5, 6 for fastening together the two sections 2, 3 may vary depending on the constructional requirements of the frame.

[0029] Some preferred embodiments of fixing means 4 will be described below.

[0030] The connection element 9 mentioned above substantially consists of a plate which is preferably made of plastic material and which is shaped in the manner of the profile of the joining faces 2', 3', except for the area occupied by the second openings 10.

[0031] The connection element 9 has a first portion 11, which is preferably made of rigid plastic material, such as for example a high-strength ABS synthetic resin, having a perimetral edge 12 able to remain visible along an outer peripheral section thereof, once the frame is completely prepared and assembled.

[0032] The example according to Figures 1-3 relates to the frame of a leaf having a first side F1 (Figure 2) intended to receive a cladding with aluminium sections, able to face the external environment, and a second side F2 (Figure 1) intended to face the inside of the building.

[0033] The edge 12 of the connection element will therefore in this case be advantageously visible in the side F2 of the frame.

[0034] Preferably, the connection element has a second portion 13 which forms one piece with the first portion and is for example obtained by means of co-moulding and which is resiliently yielding under the compressive force exerted by the fixing means 4. In this way, the resilient reaction of this second portion allows the sealing effect between the two sections 2, 3 between which the element 9 is arranged to be increased.

[0035] Advantageously, the first portion extends over the entire area of the connection element forming the support core on which the second portion is co-moulded.

[0036] In Figures 4, 6, 8, 10 and 12 five examples of fixing means 4 are shown.

[0037] In accordance with the first example of Figures 4, 5a and 5b, the connection element 9 has, fixed thereon, two pairs of cylindrical pins 14 which project from its faces 15, 16 in opposite directions so as to be inserted with grip inside corresponding blind holes 17 formed in the faces of the two sections 2, 3.

[0038] These cylindrical pins 14, in addition to increasing the mechanical grip between the two sections 2 and 3, have the function of facilitating relative centring thereof and therefore may be advantageously maintained also in all the following examples.

[0039] The expression "cylindrical" is understood as meaning the shape of any solid form which has a side surface with parallel generatrix lines, even though not delimiting the cylinder commonly known as a straight cylinder.

[0040] In greater detail, in accordance with the first example of embodiment, each first opening 5, 6 is shaped in the manner of a groove, which extends in a direction X parallel to the joining face of the section 2, 3 from its outer perimeter and extends inside the said section 2, 3 from its face with a widened portion able to define an undercut 18.

[0041] The seat 7 obtained from the grooves 5, 6 thus formed receives a correspondingly shaped pin 8 with solid flanges 19 which widen in the form of a wedge from the middle section so as to be gripped in the undercuts 18 of the grooves 5,6 and thus keep the sections 2, 3 joined together.

[0042] In the first example of the accompanying figures, three pins 8 are envisaged. Obviously a different number of pins 8 may be envisaged without thereby departing from the scope of protection of the present patent.

[0043] Moreover, in accordance with this first example, the pins 8 are inserted in seats 7 which extend in directions X transverse to the plane of lie of the frame.

[0044] Alternatively, the joint 1 according to the second example of embodiment shown in Figures 6, 7a and 7b is provided with a single pin 8 which is inserted inside the seat 7 parallel to the plane of lie in a direction indicated by X'.

[0045] Advantageously, insertion is performed from the outside of the frame towards the inside. In both the examples of embodiment described, the seats are blind and do not affect the side of the section opposite to the starting side from which they extend.

[0046] In accordance with the third embodiment shown in Figures 8, 9a and 9b, the ends 8' and 8 " of the pin 8 are arranged inside transverse holes 20 formed in internally hollow and threaded cylindrical bushes 21 inserted inside channels 22 formed in the respective sections 2, 3. The said ends 8' and 8" of the pin 8 are provided with elongated eyelets 23 in the direction of extension of the pins 8. These eyelets 23 are situated at a relative distance from each other able to ensure that their engagement with suitable grub screws 24, screwed into the internal thread of the bushes 21, forces the pin 8 to move the two sections 2, 3 towards each other.

[0047] In accordance with the fourth embodiment shown in Figures 10, 11a and 11b, the pin 8 has the form of a circular ring and is inserted inside annular grooves 5,6 formed by means coring on the joining faces of the sections and defining a pair of cylindrical shapes 25.

[0048] It is envisaged using a screw 26 arranged to pass through the cylindrical shapes 25 so as to join mechanically together the sections 2, 3 already constrained by the pin 8.

[0049] In accordance with the fifth embodiment shown in Figures 12, 13a and 13b, the pin 8 is provided internally with a through-cavity 27 which tapers from the ends towards the middle section so as to define a double conicity.

[0050] The abovementioned cavity 27 is passed through by a screw 28 and by a nut screw 29, which both have an elongated shape, which are inserted inside holes formed in the respective sections 2, 3 and which, mating with each other, force with the head 30 the pin 8 to expand its grip inside the seat 8, thereby mechanically retaining and fastening together the two sections 2, 3.

[0051] The invention thus conceived therefore achieves the predefined objects.

[0052] Obviously, it may assume, in its practical embodiment, also forms and configurations different from that illustrated above, without thereby departing from the present scope of protection as defined in the claims.

Claims

1. Corner joint (1) for sections of door and window frames, comprising:

- a first (2) and a second (3) section which can be joined together to form a frame, along respective joining faces (2', 3') divided by a joining plane and united by means of fixing means (4) which envisage that said joining faces (2', 3') have, formed in them, in opposite positions first openings (5, 6) able to form a seat (7) which extends on either side of the joining plane and which comprise at least one pin (8) able to engage inside said seat (7) so as to fix said sections (2, 3) together;

- at least one connection element (9) arranged between said first (2) and second (3) section along said joining plane, having at least one first portion (11) with a visible edge (12) on one side (F2) of said frame;

characterized in that each said first opening (5, 6) is shaped in the form of a groove extending in a direction (X) parallel to the joining face (2', 3') from its outer perimeter and extending inside said section (2, 3) with at least one widened portion able to define at least one undercut (18); said seat (7) obtained by the grooves of the opposite faces (2', 3') being able to receive said pin (8) which is shaped so as to match said seat (7) and is able to join together said sections (2, 3), gripping by means of its widened flanges (19) inside the undercuts (18) of said grooves; and that said connection element (9):

- is a plate having second openings (10) positioned in correspondence of said first opposite openings (5, 6) so as to connect together said first opposite openings (5, 6), and shaped in the manner of the profile of the joining faces (2', 3'), except for the area occupied by the second openings (10);

- and comprises at least two cylindrical pins (14) projecting from its two faces (15, 16) in opposite directions and able to be inserted with mechanical grip inside corresponding blind holes (17) formed in the joining faces (2', 3') of the two sections (2, 3) in a position corresponding to that of the cylindrical pins (14).

2. Corner joint (1) for sections of door and window frames according to claim 1, characterized in that said connection element (9) has at least one second resiliently yielding portion (13) able to be compressed along the joint so as to increase the seal between said sections (2, 3).

3. Corner joint (1) for sections of door and window frames according to Claims 2, characterized in that said connection element (9) is made of plastic material by means of co-moulding of said two portions (11, 13), the first one (11) of which being more rigid than the second one (13).

4. Corner joint (1) for sections of door and window frames according to claim 1, characterized in that said pin (8) is inserted transversely with respect to the plane of lie of said frames.

5. Corner joint (1) for sections of door and window frames according to claim 1, characterized in that said pin (8) is inserted parallel to the plane of lie of said frame.

6. Corner joint (1) for sections of door and window frames according to claim 1, characterized in that said pin (8) is provided internally with a through-cavity (27) having at least one conicity, which cavity (27) is passed through by a screw (28) and by a nut screw (29) which are inserted inside holes formed in the respective sections (2, 3) and which, joining together, force said pin (8) to grip inside said seat (7).

7. Corner joint (1) for sections of door and window frames according to claim 1, characterized in that the ends (8', 8") of said pin (8) are arranged inside transverse holes (20) of bushes (21) which are inserted inside channels (22) formed in the respective sections (2, 3) and are provided with elongated eyelets (23) able to receive grub screws (24) engaging inside said bushes (21) so as to force the pin (8) to move the two sections (2, 3) axially towards each other.

8. Corner joint (1) for sections of door and window frames according to claim 1, characterized in that said pin (8) has the form of a circular ring and is inserted inside annular grooves formed by means of coring on said joining faces (2', 3') delimiting a pair of cylindrical shapes (25), a screw (26) being provided so as to pass through the cylindrical shapes (25) so as to force gripping of said sections (2, 3).

Ansprüche

1. Eckverbindung (1) für Tür- und Fensterprofile, umfassend:

- ein erstes (2) und ein zweites (3) Profil, die zum Bilden eines Rahmens an jeweiligen Verbindungsflächen (2', 3'), die durch eine Verbindungsebene getrennt und durch Befestigungsmittel (4), die vorsehen, dass in den Verbindungsflächen (2', 3') in gegenüberliegenden Positionen erste Öffnungen (5, 6) ausgebildet sind, die dazu geeignet sind, einen Sitz (7) zu bilden, der sich rittlings über der Verbindungsebene erstreckt, und die mindestens einen Stift (8) umfassen, der fähig ist, in den Sitz (7) einzugreifen, um die Profile (2, 3) aneinander zu befestigen, vereint sind, miteinander verbunden werden können;

- mindestens ein zwischen das erste (2) und zweite (3) Profil auf Höhe der Verbindungsebene eingefügtes Verbindungselement (9), das mindestens einen ersten Abschnitt (11) mit einem von einer Oberfläche (F 2) des Rahmens sichtbaren Rand (12) aufweist;

dadurch gekennzeichnet,
dass jede erste Öffnung (5, 6) mit der Form einer Nut geformt ist, die sich entlang einer zur Verbindungsfläche (2', 3') parallelen Richtung (X) ausgehend von ihrem äußeren Umfang erstreckt und im Innern des Profils (2, 3) mit mindestens einem aufgeweiteten Abschnitt verläuft, der geeignet ist, mindestens einen Hinterschnitt (18) zu definieren; wobei der durch die Nuten der gegenüberliegenden Flächen (2', 3') erhaltene Sitz (7) geeignet ist, den in Bezug auf den Sitz (7) gegengeformten Stift (8) aufzunehmen, der fähig ist, die Profile (2, 3) zu verbinden, indem er mit Hilfe seiner erweiterten Schenkel (19) an den Hinterschnitten (18) der Nuten angreift;
und dass das besagte Verbindungselement (9):

- eine Platte ist, die zweite Öffnungen (10) aufweist, die in Entsprechung mit den gegengeformten ersten Öffnungen (5, 6) zum Verbinden der ersten gegengeformten Öffnungen (5, 6) angeordnet sind, und, mit Ausnahme der von den zweiten Öffnungen (10) belegten Fläche, gemäß dem Profil der Verbindungsflächen (2', 3') geformt ist;

- und mindestens zwei aus seinen Oberflächen (15, 16) in entgegengesetzte Richtungen herausragende zylindrische Stifte (14) umfasst, die fähig sind, sich mit mechanischem Eingriff in übereinstimmende Sacklöcher (17) einzufügen, die in den Verbindungsflächen (2', 3') der zwei Profile (2, 3) in einer den zylindrischen Stiften (14) entsprechenden Position ausgebildet sind.

2. Eckverbindung (1) für Tür- und Fensterprofile nach Anspruch 1, dadurch gekennzeichnet, dass das Verbindungselement (9) mindestens einen zweiten elastisch nachgiebigen Abschnitt (13) aufweist, der fähig ist, in der Verbindung zusammengepresst zu werden, um die Abdichtung der besagten Profile (2, 3) zu erhöhen.

3. Eckverbindung (1) für Tür- und Fensterprofile nach Anspruch 2, dadurch gekennzeichnet, dass das Verbindungselement (9) aus Plastikmaterial mittels Anformen der zwei Abschnitte (11, 13) ausgebildet ist, von denen der erste (11) steifer als der zweite (13) ist.

4. Eckverbindung (1) für Tür- und Fensterprofile nach Anspruch 1, dadurch gekennzeichnet, dass der Stift (8) quer zur Lageebene des Rahmens eingefügt ist.

5. Eckverbindung (1) für Tür- und Fensterprofile nach Anspruch 1, dadurch gekennzeichnet, dass der Stift (8) parallel zur Lageebene des Rahmens eingefügt ist.

6. Eckverbindung für Tür- und Fensterprofile nach Anspruch 1, dadurch gekennzeichnet, dass der Stift (8) innen mit einer durchgehenden Aushöhlung (27) mit mindestens einer Konizität versehen ist, wobei die Aushöhlung (27) von einer Schraube (28) und einer Schraubenmutter (29), die in in den jeweiligen Profilen (2, 3) ausgebildete Löcher eingesetzt sind, durchquert wird, die, indem sie sich miteinander verbinden, den Eingriff des Stifts (8) in den Sitz (7) erzwingen.

7. Eckverbindung (1) für Tür- und Fensterprofile nach Anspruch 1, dadurch gekennzeichnet, dass die Enden (8', 8") des Stifts (8) in Querlöchern (20) von Buchsen (21), die in in den jeweiligen Profilen (2, 3) ausgebildete Kanäle (22) eingesetzt sind, angeordnet und mit Langlöchern (23) versehen sind, die geeignet sind, Gewindestifte (24) aufzunehmen, die in die Buchsen (21) eingreifen, um den Stift (8) zu zwingen, die zwei Profile (2, 3) axial aneinander zu rücken.

8. Eckverbindung (1) für Tür- und Fensterprofile nach Anspruch 1,
dadurch gekennzeichnet, dass der Stift (8) die Form eines kreisrunden Rings aufweist und in durch Kernbohren in den Verbindungsflächen (2', 3') ausgebildete ringförmige Nuten eingesetzt ist, die ein Paar zylindrischer Gebilde (25) begrenzen; wobei eine Schraube (26) derart vorgesehen ist, dass sie die zylindrischen Gebilde (25) durchquert, um den Zusammenhalt der Profile (2, 3) zu erzwingen.

Revendications

1. jonction angulaire (1) pour profilés de menuiseries, comportant:

- un premier (2) et un second (3) profilé pouvant être jointés entre eux pour la formation d'un cadre, à niveau de leurs faces de raccordement respectives (2', 3') séparées par un plan de jonction, et reliées par des moyens de fixation (4), qui prévoient que sur les faces de raccordement (2', 3') susdites soient obtenues dans des positions opposées des premières ouvertures (5, 6) aptes à réaliser un siège (7) qui se développe à cheval sur le plan de jonction, et lesquels incluent au moins une goupille (8) susceptible de s'engager dans le siège (7) susdit pour fixer les profilés (2, 3) susdits entre eux;

- au moins un élément de raccordement (9) interposé entre les premier (2) et second (3) profilés susdits, à niveau du plan de jonction susdit, muni d'au moins une première portion (11) avec son bord à vue (12) depuis une face (F2) du cadre susdit ;

caractérisée en ce que
chaque première ouverture (5, 6) susdite est façonnée en forme de rainure s'étendant le long d'un sens (X) parallèle par rapport à la face de raccordement (2' , 3') à partir de son périmètre extérieur et se développant à l'intérieur du profilé (2, 3) susdit avec au moins une portion élargie apte à définir au moins une contre-dépouille (18) ; le siège (7) susdit obtenu des rainures des faces opposées (2', 3') étant apte à abriter la goupille (8) susdite contre-façonnée par rapport au siège (7) susdit susceptible de raccorder les profilés (2, 3) susdits, en ayant prise par ses ailes élargies (19) sur les contre-dépouilles (18) des rainures susdites ;
et que l'élément de raccordement (9) susdit :

- est une plaque munie de secondes ouvertures (10) positionnées à niveau des premières ouvertures opposées (5, 6) susdites raccordant les premières ouvertures opposées (5, 6) susdites et façonnée selon le profilé des faces de raccordement (2', 3'), à l'exception de la zone occupée par les secondes ouvertures (10) ;

- et comporte au moins deux goupilles cylindriques (14) saillant de ses faces (15, 16) dans des sens opposés susceptibles de s'introduire par prise mécanique à l'intérieur de trous borgnes homologues (17) obtenus dans les faces de raccordement (2', 3') des deux profilés (2, 3) dans une position correspondant aux goupilles cylindriques (14).

2. jonction angulaire (1) pour profilés de menuiseries selon la revendication 1, caractérisée en ce que l'élément de raccordement (9) susdit est muni d'au moins une seconde portion élastiquement mouvante (13) susceptible d'être comprimée dans la jonction pour améliorer la tenue des profilés (2, 3) susdits.

3. jonction angulaire (1) pour profilés de menuiseries selon la revendication 2, caractérisée en ce que l'élément de raccordement (9) susdit est formé en matière plastique par co-estampage des deux portions (11, 13) susdites, dont la première (11) étant plus rigide que la seconde (13).

4. jonction angulaire (1) pour profilés de menuiseries selon la revendication 1, caractérisée en ce que la goupille (8) susdite est introduite transversalement par rapport au sol de la taille du cadre susdit.

5. jonction angulaire (1) pour profilés de menuiseries selon la revendication 1, caractérisée en ce que la goupille (8) susdite est introduite parallèlement par rapport au sol de la taille du cadre susdit.

6. jonction angulaire pour profilés de menuiseries selon la revendication 1, caractérisée en ce que la goupille (8) susdite est intérieurement munie d'une cavité passante (27) avec au moins une conicité, la cavité (27) susdite étant traversée par une vis (28) et par une vis femelle (29) introduites dans des trous obtenus de leurs profilés respectifs (2, 3), lesquelles, par leur emmanchement, forcent la goupille (8) susdite en prise sur le siège (7) susdit.

7. jonction angulaire (1) pour profilés de menuiseries selon la revendication 1, caractérisée en ce que les extrémités (8', 8") de la goupille (8) susdite sont agencées à l'intérieur de trous transversaux (20) de buses (21) introduites dans des canaux (22) obtenus sur leurs profilés respectifs (2, 3) et qu'elles sont munies de fentes allongées (23) aptes à recevoir des grains (24) engagés dans les buses (21) susdites pour forcer la goupille (8) à approcher axialement les deux profilés (2, 3).

8. jonction angulaire (1) pour profilés de menuiseries selon la revendication 1, caractérisée en ce que la goupille (8) susdite est en forme d'anneau circulaire et qu'elle est introduite dans des rainures annulaires obtenues par carottage sur les faces de raccordement (2', 3') susdites délimitant un couple de figures cylindriques (25) ; une vis (26) étant prévue pour passer à travers les figures cylindriques (25), en vue de forcer en tenue les profilés (2, 3) susdits.

Drawing