DK173391B1

DK173391B1 - Coupling nut and method for making it

Info

Publication number: DK173391B1
Application number: DK112197A
Authority: DK
Inventors: Goeran Henningsson
Original assignee: Ikea Internat A S
Priority date: 1997-09-30
Filing date: 1997-09-30
Publication date: 2000-09-18
Also published as: DK112197A

Description

i DK 173391 B1in DK 173391 B1

Opfindelsen angår en koblingsmøtrik til brug sammen med en koblingsskrue med henblik på sammenføjning af to møbelplader, som er i hovedsagen vinkelrette på hinanden, idet koblingsmøtrikken er indlagt i en udsparing i en af de store sideflader på den ene møbelplade, og koblingsskruens skaft er ført vinkelret igennem den anden møbelplade fra 5 den ene af dennes store sideflader og ind gennem en i den første møbelplade værende kanal, der kommunicerer med den nævnte udsparing, og hvor et gevind på koblingsskruens skaft samvirker med et i forhold til koblingsmøtrikkens længdeakse tværgående gevindhul i koblingsmøtrikken, hvor koblingsmøtrikken er fremstillet ud fra et udstanset og opbukket metalpladeemne, og hvor to i hovedsagen til halvcylindrisk form bukkede 10 sideflige på metalpladeemnet danner en hul cylinderdel.The invention relates to a coupling nut for use with a coupling screw for joining two furniture plates which are substantially perpendicular to one another, the coupling nut being inserted in a recess in one of the large side surfaces of one furniture plate and the coupling screw shaft being perpendicular through the second furniture plate from one of its large lateral surfaces and through a channel in the first furniture plate communicating with said recess, and in which a thread on the coupling screw shaft cooperates with a transverse threaded hole in the coupling nut in relation to the longitudinal axis of the coupling nut, wherein the coupling nut is made from a punched and bumped metal plate blank, and wherein two generally semi-cylindrical forms 10 side tabs on the metal plate blank form a hollow cylinder member.

Fra SE 9301106 kendes en koblingsskrue af den indledningsvis nævnte art, hvor metalpladeemnet er forsynet med tre (eller flere) huller og er bukket til S-form (eller anden form), så at hullerne kommer til at ligge på linje. Hullerne danner tilsammen en tværgående, gennem hele koblingsmøtrikken forløbende åbning med tre (eller flere) diskrete 15 understøtningssteder for en pladeskrue. En ulempe ved denne koblingsmøtrik er, at forbindelsen mellem en pladeskrue og den tværgående åbning ikker er lige så sikker og stærk som forbindelsen mellem en skrue og et gevindhul, hvor skruens gevind er i indgreb med gevindhullets gevind over et forholdsvis stort areal.SE 9301106 discloses a coupling screw of the type mentioned initially, in which the metal plate blank is provided with three (or more) holes and is bent into an S-shape (or other shape) so that the holes are aligned. The holes together form a transverse opening extending through the entire coupling nut with three (or more) discrete support locations for a plate screw. A disadvantage of this coupling nut is that the connection between a plate screw and the transverse opening is not as secure and strong as the connection between a screw and a threaded hole, where the threads of the screw engage with the threaded holes over a relatively large area.

Formålet med opfindelsen er at anvise en koblingsmøtrik af den indledningsvis nævnte 20 art, med hvilken der i forhold til den kendte teknik kan opnås en stærkere og mere sikker forbindelse mellem koblingsmøtrikken og en tilhørende koblingsskrue.The object of the invention is to provide a coupling nut of the above mentioned type, with which a stronger and more secure connection between the coupling nut and an associated coupling screw can be obtained in relation to the prior art.

Koblingsmøtrikken ifølge opfindelsen er ejendommelig ved, at møtrikkens tværgående gevindhul findes i en fra metalpladeemnet udgående, ind mod møtrikkens midterakse rettet, åben rørdel. Herved opnås der en koblingsmøtrik, med hvilken der kan opnås en 25 stærkere og mere sikker forbindelse mellem koblingsmøtrikken og en tilhørende koblingsskrue, fordi de to sidstnævnte kan bringes i indgreb med hinanden over et forholdsvis stort gevindareal, som den åbne rørdel frembyder. Dette til forskel fra den kendte DK 173391 B1 2 teknik, hvor koblingsskruen kun kan bringes i indgreb med koblingsmøtrikken ved diskrete understøtningssteder.The coupling nut according to the invention is characterized in that the transverse threaded holes of the nut are located in an open pipe part directed from the metal plate blank, towards the middle axis of the nut. Hereby a coupling nut is obtained, with which a stronger and more secure connection can be obtained between the coupling nut and an associated coupling screw, because the latter two can be engaged with each other over a relatively large threaded area provided by the open pipe part. This is in contrast to the prior art DK 173391 B1 2 in which the coupling screw can only be engaged with the coupling nut at discrete support points.

Ifølge opfindelsen kan rørdelen være dannet ved hjælp af en fra metalpladeemnet optrukket, cylindrisk kop, i hvis bund der er lokket et hul, hvor hullets randdel efter lokningen 5 er rettet ud, så den ligger i forlængelse af koppens sidevæg. Herved opnås et solidt gevind.According to the invention, the pipe part can be formed by means of a cylindrical cup pulled up from the metal plate blank, in the bottom of which a hole is closed, the hole part of the hole after the closure 5 being aligned so that it is in extension of the side wall of the cup. This results in a solid thread.

Ifølge opfindelsen kan de to til halvcirkulær form bukkede sideflige - i den sidekant, der støder op til den anden sideflig - have en indskæring, idet de to indskæringer tilsammen fastlægger en åbning, der ligger ud for gevindhullet, og hvorigennem den nævnte kob-10 lingsskrue kan føres. Herved kan den samvirkende koblingsskrue iskrues fra to sider. Ligeledes kan koblingsskruen føres hele vejen gennem koblingsmøtrikken fra den ene side og ud på den anden side. Dette er især fordelagtigt, hvis koblingsskruen er så lang, at den, hvis gevindhullet var blindt, ikke ville kunne skrues helt ind, så at skruehovedet kommer til anlæg mod den anden møbelplade.According to the invention, the two to semi-circular shape curved side tabs - in the side edge adjacent to the other side tab - may have a notch, the two notches together defining an opening adjacent the threaded hole and through which said coupling screw can be led. This enables the cooperating coupling screw to be screwed from two sides. Likewise, the coupling screw can be passed all the way through the coupling nut from one side to the other. This is particularly advantageous if the coupling screw is so long that, if the threaded hole was blind, it would not be fully screwed in so that the screw head comes into contact with the second piece of furniture.

15 I en foretrukken udførelsesform form for koblingsmøtrikken ifølge opfindelsen har det ubukkede metalpladeemne en tykkelse på 1-1,8 mm, fortrinsvis 1,1-1,5 mm, især 1,3 mm. Herved kan metalpladeemnet udstanses og opbukkes uden problemer samtidig med, at der opnås en tilstrækkelig solid koblingsmøtrik.In a preferred embodiment of the coupling nut according to the invention, the unbaked metal plate blank has a thickness of 1-1.8 mm, preferably 1.1-1.5 mm, especially 1.3 mm. This allows the sheet metal blank to be punched and bumped without any problems while obtaining a sufficiently solid coupling nut.

Ifølge opfindelsen kan metalpladeemnet desuden have en i hovedsagen cirkulær lågflig, 20 som er således bukket, at den afslutter den ene ende af cylinderdelen, og hvor denne lågflig i hovedsagen på midten har en slids, med hvilken koblingsmøtrikken - efter anbringelse i den første møbelplade værende udsparing - ved hjælp af et værktøj, f.eks. en skruetrækker, kan drejes, så at gevindhullet kommer til at ligge ud for den første møbelplades kanal. Herved bliver sammenføjningen af de to møbelplader nemmere.In addition, according to the invention, the sheet metal blank can have a substantially circular lid tab 20 which is bent so as to terminate one end of the cylinder part and wherein this lid tab generally has a slot with which the coupling nut - after being placed in the first furniture sheet, recess - using a tool, e.g. a screwdriver can be rotated so that the threaded hole is positioned on the channel of the first piece of furniture. This makes the joining of the two pieces of furniture easier.

DK 173391 B1 3DK 173391 B1 3

Ifølge opfindelsen kan metalpladeemnets lågflig fremdeles have en indskæring, og metalpladeemnets to sideflige hver have et fremspring, der er bragt i låsende indgreb med den nævnte indskæring. Herved opnås en mere solid koblingsskrue.According to the invention, the metal tab blank lid can still have a notch, and the two side tabs of the metal plate blank each have a projection which is interlocked with said notch. This results in a more solid coupling screw.

Ifølge opfindelsen kan metalpladeemnet have to i hovedsagen rektangulære lågflige, som 5 er således bukket, at de tilsammen afslutter den ene ende af cylinderdelen, idet der dog mellem disse to lågflige - i hovedsagen på midten af den af lågfligene afsluttede endeflade af cylinderdelen - findes en spalte, med hvilken koblingsmøtrikken - efter at denne er blevet anbragt i den første møbelplades udsparing - ved hjælp af et værktøj, f.eks. en skruetrækker, kan drejes, så at gevindhullet kommer til at ligge ud for den første mø-10 belplades kanal.According to the invention, the metal plate blank may have two substantially rectangular cap tabs which are bent so as to terminate one end of the cylinder member together, however, between these two cap tabs - generally at the center of the end portion of the cylinder cap terminated by the cap tabs - a slot with which the coupling nut - after it has been placed in the recess of the first furniture plate - by means of a tool, e.g. a screwdriver can be rotated so that the threaded hole is adjacent to the channel of the first furniture plate.

Opfindelsen angår også en fremgangsmåde til fremstilling af førnævnte koblingsmøtrik, og hvor koblingsmøtrikken fremstilles ud fra et udstanset og opbukket metalpladeemne og forsynes med et tværgående gevindhul, hvorigennem en koblingsskrue kan føres med henblik på sammenføjning af to møbelplader, hvilken fremgangsmåde er ejendommelig 15 ved, at a) et metalpladeemne med sideflige og en lågflig med slids eller to lågflige udstanses fra et metalbånd med i hovedsagen samme bredde som den færdige koblingsmøtriks omkreds, idet dog metalpladeemnet på et lille sted stadig er sammenhængende med lignende metalpladeemner, 20 b) koppen optrækkes, c) et hul med mindre diameter end koppens indvendige diameter lokkes i bunden af koppen, d) hullets randdel rettes ud, så den ligger i forlængelse af koppens sidevæg, hvorved der dannes et rør, der er åbent i begge ender, DK 173391 B1 4 e) et gevind skæres indvendigt i røret, O metalpiadeemnet klippes fra rækken af metalpladeemner, g) metalpladeemnets to sideflige hver for sig bukkes til halvcylindrisk form, så at sidefligene tilsammen danner en hul cylinderformet del, 5 h) metalpladeemnets lågflig eller lågflige bukkes i hovedsagen 90° til lukning af den ene ende af den cylinderformede del.The invention also relates to a method of manufacturing the aforementioned coupling nut, wherein the coupling nut is made from a punched and bended metal plate blank and provided with a transverse threaded hole through which a coupling screw can be guided to join two furniture plates, the method being characterized by: a) a metal plate blank with side tabs and a lid tab with slots or two lid tabs are punched from a metal band of substantially the same width as the perimeter of the finished coupling nut, although in a small place the metal plate blank is still coherent with similar metal plate blank; d) a hole with a smaller diameter than the inside diameter of the cup is lured into the bottom of the cup; d) the edge portion of the hole is aligned so that it extends beyond the side wall of the cup, thereby forming a tube open at both ends; ) a thread is cut inside the tube, the O metal pad blank is cut from the row of metal plate g) the two side tabs of the metal plate blank are each bent into a semi-cylindrical shape so that the side tabs together form a hollow cylindrical part; 5) the metal plate blank or lid tabs are substantially bent 90 ° to close one end of the cylindrical part.

Denne fremgangsmåde har vist sig særlig hensigtsmæssig til fremstilling af koblings-møtrikker ifølge opfindelsen. En udformning af fremgangsmåden ifølge opfindelsen er ejendommelig ved den ændring, at rørets indvendige gevind først skæres efter, at de to 10 sideflige hver især er bukket til halvcylindrisk form. Herved undgås en risiko for, at gevindet deformeres efter skæringen på grund af bukningen.This method has proved particularly suitable for the production of coupling nuts according to the invention. An embodiment of the method according to the invention is characterized by the change that the internal threads of the pipe are not cut until the two 10 side tabs are each bent into semi-cylindrical shape. This avoids the risk of the thread deforming after the cutting due to the bending.

Endelig kan ifølge opfindelsen koblingsmøtrikken fremstilles ved, at metalpladeemnet under sin udstansning får udstanset fremspring på sidefligene samt en indskæring i lågsidens periferi, hvorefter lågfligen under bukningen bringes til låsende indgreb med 15 sidefligene, ved at lågdelens indskæring føres ned over de nævnte fremspring.Finally, according to the invention, the coupling nut can be made by punching out the metal plate blank during its punching, as well as a cut-out in the lower side periphery, after which the lid tab during the bending is brought into locking engagement with the side tabs by sliding the cut-off of the cover part over the said cut-outs.

Opfindelsen forklares nedenfor under henvisning til tegningen, hvor fig. 1 viser en koblingsmøtrik ifølge opfindelsen i en første udførelsesform, set i perspektiv, fig. 2 et tværsnit gennem en sammenføjning af to møbelplader, hvor koblingsmøtrikken 20 ifølge opfindelsen er indlagt i en udsparing i den ene møbelplade, og den samvirkende koblingsskrue er ført vinkelret gennem den anden møbelplade, DK 173391 B1 5 fig. 3 et antal udstansede metalpladeemner ifølge opfindelsen, set fra oven, fig. 4 et tværsnit gennem en i metalpladeemnet tildannet kop, hvori der er lokket et hul, fig. 5 samme, idet hullets randdel er blevet rettet ud, så at den ligger i forlængelse af koppens sidevæg, hvorefter den således dannede rørdel er blevet forsynet med et indven-5 digt gevind, fig. 6 et metalpladeemne som i fig. 3, idet to sideflige hver især er bukket til halvcirkulær form, set i perspektiv, fig. 7 et antal udstansede metalpladeemner ifølge en anden udførelsesform for opfindelsen, set fra oven, og 10 fig. 8 en koblingsmøtrik ifølge opfindelsen i en anden udførelsesform, set i perspektiv.The invention is explained below with reference to the drawing, in which fig. 1 is a perspective view of a coupling nut according to the invention in a first embodiment; FIG. 2 is a cross-section through a joint of two furniture plates, where the coupling nut 20 according to the invention is inserted into a recess in one furniture plate and the cooperating coupling screw is passed perpendicularly through the other furniture plate, FIG. 3 is a plan view of a plurality of punched metal sheet blanks according to the invention; FIG. 4 is a cross-section through a cup formed in the metal plate blank in which a hole is closed; FIG. 5 is the same, with the rim portion of the hole being straightened so as to be in extension of the side wall of the cup, after which the tube portion thus formed has been provided with an internal thread; FIG. 6 is a metal plate blank as in FIG. 3, with two side tabs each bent into semi-circular shape, seen in perspective; 7 is a top view of a plurality of punched metal sheet blanks according to another embodiment of the invention; and FIG. 8 is a perspective view of a coupling nut according to the invention in another embodiment.

Den i fig. 1 viste koblingsmøtrik 1 kan som vist i fig. 2 bruges sammen med en koblingsskrue 33 ved sammenføjning af to møbelplader 31, 32, som er i hovedsagen vinkelrette på hinanden. Koblingsmøtrikken er indlagt i en udsparing 30 i en første møbelplade 31, og koblingsskruens 33 skaft er ført vinkelret igennem den anden møbelplade 32 og 15 videre ind igennem en i den første møbelplade 31 værende kanal 34 og videre ind i indgreb med koblingsmøtrikken 1.The FIG. 1, as shown in FIG. 2 is used with a coupling screw 33 by joining two furniture plates 31, 32 which are generally perpendicular to each other. The coupling nut is inserted into a recess 30 in a first furniture plate 31, and the shaft of the coupling screw 33 is passed perpendicularly through the second furniture plate 32 and 15 further through a channel 34 present in the first furniture plate 31 and further into engagement with the coupling nut 1.

I fig. 3 ses en række sammenhængende metalpladeemner efter udstansning fra et metalbånd med bredden b. Hvert metalpladeemne består i hovedsagen af to sideflige 2, 3 og en i hovedsagen cirkulær lågflig 8. Sidefligene 2, 3 har hver især en halvcirkelformet 20 indskæring 2b, 3b og et rektangulært fremspring 2c, 3c. Lågfligen 8 er forsynet med en aflang slids 8a og en i hovedsagen rektangulær indskæring 8b. Hvert metalpladeemne har på midten en optrukket, cylindrisk kop 10.1 bunden af denne kop 10 er der lokket et hul 5.In FIG. 3, a series of continuous metal plate blanks is seen after being cut from a metal band of width b. Each metal plate blank consists essentially of two side tabs 2, 3 and a substantially circular lid tab 8. Side tabs 2, 3 each have a semi-circular 20 notch 2b, 3b and rectangular projection 2c, 3c. The cover tab 8 is provided with an oblong slot 8a and a generally rectangular cut-out 8b. Each metal plate blank has a raised cylindrical cup 10.1 in the middle of the bottom of this cup 10, a hole 5 is closed.

DK 173391 B1 6 I fig. 4 ses et snit gennem koppen 5 efter linien IV-IV i fig. 3. Efter at hullet 5 er blevet lokket i bunden af koppen 10, rettes hullets randdel 6 ud, så at den kommer til at ligge i forlængelse af koppens sidevæg.DK 173391 B1 6 In fig. 4 shows a section through the cup 5 along the line IV-IV in FIG. 3. After the hole 5 has been closed at the bottom of the cup 10, align the edge portion 6 of the hole so that it will lie in extension of the side wall of the cup.

I fig. 5 ses koppen 10 fra fig. 4, efter at randdelen 6 er rettet ud, og efter at der er skåret 5 et gevind 11.In FIG. 5, the cup 10 of FIG. 4, after the rim portion 6 is straightened and after cutting 5 a thread 11.

I fig. 6 ses et metalpladeemne, hvor sidefligene 2,3 hver især er bukket til halvcirkulær form, så at de tilsammen danner en hul cylinderdel.In FIG. 6, a metal plate blank is seen in which the side tabs 2,3 are each bent into a semi-circular shape so that they together form a hollow cylinder part.

I fig. 7 ses en række metalpladeemner svarende til dem, der er vist i fig. 3, men i en anden udførelsesform. I denne udførelsesform er den i hovedsagen cirkulære lågflig 8 10 fra fig. 3 blevet erstattet af to i hovedsagen rektangulære lågflige 18a, 18b.In FIG. 7, a series of metal plate blanks similar to those shown in FIG. 3, but in another embodiment. In this embodiment, the substantially circular lid tab 8 of FIG. 3 has been replaced by two substantially rectangular lid tabs 18a, 18b.

I den i fig. 8 viste anden udførelsesform for koblingsmøtrikken ifølge opfindelsen er koblingsmøtrikken dannet ud fra et metalpladeemne ifølge fig. 7. De to lågflige 18a, 18b er bukket, så at de tilsammen afslutter den ene ende af den hule cylinderdel. Efter bukning af disse to lågflige vil der være en spalte 19 mellem dem, med hvilken 15 koblingsmøtrikken - efter anbringelse i udsparingen i den ene møbelplade - ved hjælp af et værktøj, f.eks. en skruetrækker, kan drejes, så at gevindhullet 9 kommer til at ligge ud for den første plades 31 kanal 34.In the embodiment shown in FIG. 8 shows the second embodiment of the coupling nut according to the invention, the coupling nut is formed from a metal plate blank according to FIG. 7. The two lid tabs 18a, 18b are bent so that together they terminate one end of the hollow cylinder portion. After bending these two cover tabs, there will be a slot 19 between them, with which the coupling nut - after being placed in the recess in the one piece of furniture - with the aid of a tool, e.g. a screwdriver can be turned so that the threaded hole 9 is adjacent to the channel 34 of the first plate 31.

Opfindelsen er ikke begrænset til de ovenfor nævnte udførelsesformer. For eksempel kan de to lågflige 18a, 18b på koblingsmøtrikken i fig. 8 være forsynet med fremspring, der 20 er i indgreb med udskæringer i sidefligene. Omvendt kan sidefligene være forsynet med fremspring, der er i indgreb med indskæringer i lågfligene 18a, 18b. I begge tilfælde opnås en stærkere koblingsmøtrik.The invention is not limited to the above mentioned embodiments. For example, the two cover tabs 18a, 18b on the coupling nut of FIG. 8 be provided with projections 20 which engage cut-outs in the side tabs. Conversely, the side tabs may be provided with projections which engage the notches in the cover tabs 18a, 18b. In both cases, a stronger coupling nut is obtained.

Claims

A coupling nut (1) for use with a coupling screw (33) for joining two furniture plates (31, 32) which are substantially perpendicular to each other, the coupling nut (1) being inserted into a recess (30) in one of the large side surfaces of one furniture plate (31), and the shaft of the coupling screw (33) is passed perpendicularly through the other furniture plate (32) from one of its large side surfaces and through a channel (31) located in the first furniture plate (31). 34) communicating with said recess (30) and wherein a thread on the shaft of the coupling screw (33) cooperates with a transverse threaded hole (9) of the coupling nut (9) in the coupling nut, in which the coupling nut (1) is made from a punched and folded metal plate blank, wherein two substantially cylindrical lateral tabs (2,3) on the metal plate blank form a hollow cylinder member, characterized in that the nut's transverse threaded hole (9) is provided in a metal plate blank protruding nth, towards the center axis of the nut, 15 open pipe portion (4).

Coupling nut (1) according to claim 1, characterized in that the pipe part (4) is formed by means of a cylindrical cup (10) drawn from the metal plate blank, in the bottom of which a hole (5) is closed, the edge part of the hole ( 6) after the closure is straightened so that the latter is in extension of the side wall of the cup.

Coupling nut (1) according to claim 1 or 2, characterized in that the two side tabs (2, 3) - bent in the side edge (2a, 3a) adjacent to the other side tab - have a notch (2, 3) - 2b, 3b) and that the two notches together define an opening (7) which is opposite the threaded hole (9) and through which said coupling screw (33) can be passed. 8 DK 173391 B1

Coupling nut (1) according to one or more of claims 1-3, characterized in that the unbaked metal plate blank has a thickness of 1-1.8 mm, preferably 1.1-1.5 mm, especially 1.3 mm.

Coupling nut according to one or more of claims 1-4, characterized in that the metal sheet member has a substantially circular lid tab (8) which is bent so that it terminates one end of the cylinder part and this lid tab (8) generally in the middle has a slot (8a) with which the coupling nut (1) - after being placed in the recess in the first furniture plate - can be turned by means of a tool, for example a screwdriver, so that the threaded hole (9) will be adjacent to channel 10 (34) of the first piece of furniture.

Coupling nut (1) according to claim 5, characterized in that the lid tab (8) of the metal plate blank has a notch (8b) and that the two side tabs (2, 3) of the metal plate blank each have a protrusion (2c, 3c) locking engagement with said notch (8b).

Coupling nut according to one of claims 1-4, characterized in that the metal plate member has two substantially rectangular cover tabs (18a, 18b) which are bent so that they together end one end of the cylinder part, but between these lid tabs (18a, 18b) - substantially on the middle of the end surface of the cylinder part completed by the lid tabs - are provided with a slot (19) through which the coupling nut (1) - after being inserted in the first furniture plate (31) recess (30) - using a tool, e.g. a screwdriver 20 can be turned so that the threaded hole (9) is adjacent to the channel (34) of the first furniture plate (31).

A method of manufacturing a coupling nut according to one or more of claims 5-7, wherein the coupling nut is manufactured from a punched and bended metal plate blank and provided with a transverse threaded hole through which a coupling screw can be guided to join two furniture plates, characterized in that 'DK 173391 B1 9 (a) a metal plate blank with two side tabs and a lid tab with slot or two lid tabs is punched from a metal band of substantially the same width (b) as the circumference of the finished coupling nut, with the metal plate blank in a small place, however; (3d) is still associated with similar metal plate blank, 5 b) a cup (10) is pulled into the metal plate blank, c) a hole (5) smaller in diameter than the inside diameter of the cup (10) is lured into the bottom of the cup, (d) the rim portion of the hole ( 6) straightens so that it is in extension of the side wall of the cup, thereby forming a tube (4) open at both ends; 10) cutting a thread (11) inside the tube; (f) the metal plate blank is cut from the row of metal plate blank; (g) the two side tabs (2, 3) of the metal plate blank are each bent into a semi-cylindrical shape so that the side tabs together form a hollow cylindrical portion, and h) the metal tab blank (8) or lid tabs ( 18a, 18b) are substantially bent 90 ° to 15 closure of one end of the cylindrical portion.

Method for making a coupling nut according to claim 8, characterized in that the internal threads (11) of the pipe are not cut until the two side tabs (2, 3) are each bent to form half cylinders.

Method according to claim 8 or 9 for the production of a coupling nut according to claim 20 6, characterized in that the metal plate blank during its punching is stamped with projections (2c, 3c) on the side tabs and a cut in the periphery (8b) of the cover (8b), and The lid tab (8) is then brought into locking engagement with the side tabs (2, 3) during the bending by passing the cut-off tab (8) down over said projections (2c, 3c). 5