DK146838B

DK146838B - ELECTRICAL CONNECTOR AND DEVICE BOXES

Info

Publication number: DK146838B
Application number: DK151378AA
Authority: DK
Inventors: Mats Arvidsson
Original assignee: Gustavsberg Ab
Priority date: 1977-04-12
Filing date: 1978-04-05
Publication date: 1984-01-16
Also published as: NO781264L; DK146838C; FI67972C; DK151378A; SE7704167L; FI67972B; FI780600A; NO151024B; SE405186B; NO151024C

Description

(19) DANMARK (fØ(19) DENMARK (ex

φ ns, FREMLÆGGELSESSKRIFT o i,146838 Bφ ns, PUBLICATION o i, 146838 B

DIREKTORATET FOR PATENT- OG VAREMÆRKEVÆSENETDIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Patentansøgning nr.: 1513/78 (51) Int.CI.3: H02G 3/14 (22) Indleveringsdag: OS apr 1978 (41) Alm. tilgængelig: 13 okt 1978 (44) Fremlagt: 16 jan 1984 (86) International ansøgning nr.:-(30) Prioritet: 12 apr 1977 SE 7704167 (71) Ansøger: AB ‘GUSTAVSBERG; S-513 00 Fristad, SE.(21) Patent Application No: 1513/78 (51) Int.CI.3: H02G 3/14 (22) Filing Date: OS Apr 1978 (41) Alm. available: 13 Oct 1978 (44) Submitted: 16 Jan 1984 (86) International Application No :-(30) Priority: 12 Apr 1977 SE 7704167 (71) Applicant: AB 'GUSTAVSBERG; S-513 00 Sanctuary, SE.

(72) Opfinder: Mats ‘Arvidsson; SE.(72) Inventor: Mats' Arvidsson; SEE.

(74) Fuldmægtig: Ingeniørfirmaet Lehmann & Ree__ (54) Elektriske koblings- og apparatdåser (57) Sammendrag:(74) Plenipotentiary: Lehmann & Ree__ Engineering Company (54) Electrical switchgear and appliance boxes (57) Summary:

Elektriske koblings- og apparatdåser fremstilles nu i reglen af støbt plast, idet dette dels er tilstrækkeligt stærkt materiale, dels er billigt, og dels endelig udgør et i og for sig udmærket isolationsmateriale. Forekomsten af uisolerede ledningsender inde i dåsen gør det imidlertid meget påkrævende, at al materiale, som kan komme __ i berøring med disse ledningsender, er godt isoleret. Dette gælder iElectrical switchgear and appliance boxes are now usually made of molded plastic, since this is both sufficiently strong material and partly inexpensive, and partly also an insulating material which is excellent in itself. However, the presence of uninsulated wire ends inside the can makes it very demanding that all material that may come into contact with these wire ends is well insulated. This is true in

Gu __ særlig høj grad for dåselåg og sokler til apparater, som f.eks. strøm-Gu __ especially high for cans and sockets for appliances, such as. power-

COCO

CO afbrydere, omkoblere, vægkontakter og lignende, hvilke daselag, hen- 00 CO holdsvis sokler af praktiske grunde i reglen fremstilles af metalplade, sædvanligvis stålplade. Disse dåselåg, henholdsvis sokler, fastgøres ^ nu også i reglen til dåsen ved, at en fastgørelsesring anbringes i et O spor eller mod en fals i det indre af dåsen nær dennes munding. Fast gørelsesringen er herunder forsynet med gevindhulla: til optagelse af fast- 2 146838 gørelsesskruer til dåselåget, henholdsvis soklen.CO switches, switches, wall switches and the like, which are layered, or CO sockets, respectively, for practical reasons, are usually made of sheet metal, usually steel sheet. These can covers, respectively, are also fastened to the can as a rule by placing a fastening ring in a 0 groove or against a crease in the interior of the can near its mouth. The fastening ring is provided with threaded holes below: for mounting fastening screws to the can lid and the base respectively.

Man har hidtil været af den opfattelse, at materialet til fastgørelsesringen ikke er uden betydning, thi hvis fastgørelsesringen er fremstillet af plast eller et lignende materiale, vil der sikkert blive opnået en god isolering, forudsat at man kan beskytte den i dåsen indtrængende ende af fastgørelsesskruerne mod.berøring med ledningerne, men på den anden side ville det i praksis have vist sig, at plast og lignende materialer normalt ikke har den styrke, som er nødvendig, idet gevindene let ville blive ødelagt, navnlig hvis fastgørelsesskruerne tilspændes med den styrke, som normalt anvendes ved indskruning af en skrue i et gevindhul i en del af metal. Man formodede, at dåselåget, henholdsvis apparatsoklen i så tilfælde ville løsne sig. Man har derfor hidtil været af den opfattelse, at anvendelsen af en fastgørelsesring af plast eller dermed sammenligneligt materiale ville være mindre tilfredsstillende. Det er også af denne grund blevet sædvanligt at fremstille fastgørelsesringen af metal, fortrinsvis udstanset af stål.It has hitherto been believed that the material for the attachment ring is not without significance, because if the attachment ring is made of plastic or a similar material, good insulation will surely be obtained, provided that the end of the can penetrating the fastening screws can be protected. against contact with the wires, but on the other hand, it would have been found in practice that plastics and similar materials would normally not have the strength required, the threads being easily damaged, especially if the fastening screws were tightened with the strength which usually used when screwing a screw into a threaded hole in a part of metal. In this case, it was assumed that the can lid or appliance base would come loose. It has therefore been considered so far that the use of a plastic or similar material attachment ring would be less satisfactory. For this reason, it has also become customary to manufacture the metal retaining ring, preferably stamped from steel.

Den foreliggende opfindelse hviler på undersøgelser, som havde til formål at fastslå, af hvilken grund en af plastmateriale fremstillet fastgørelsesring brister. Det har herunder vist sig, at den hidtil forfægtede, i det foregående forklarede opfattelse næppe er helt rigtig. Plast er nemlig ganske rigtigt i høj grad eftergivelig, men grunden til, at gevindindgrebet mellem en ring af plast og en deri indskruet skrue svigter, har imidlertid ikke i første række været, at gevindene som sådant gik i stykker, men gevindgrebet har snarere svigtet på grund af deformation i plastringen, hvorved gevindhullerne har udvidet sig og sædvanligvis har antaget en oval eller elliptisk eller lignende form under påvirkning af belastninger, som svækkede steder af plastringen udsættes for. Disse svækninger er fremkommet af den grund, at man nu af en fastgørelsesring kræver, at denne skal være forsynet med fikseringsanordninger overfor bevægelse i omkredsretningen i dåsen.The present invention rests on studies intended to establish why a fastener ring made of plastic material fails. It has been shown below that the previously contested opinion, which is previously explained, is hardly correct. Plastics are indeed very resilient, but the reason why the thread engagement between a plastic ring and a screw screwed into it has not been primarily that the threads as such have broken, but rather the thread grip has failed at due to deformation in the plastic ring, whereby the threaded holes have expanded and usually have assumed an oval or elliptical or similar shape under the influence of loads to which weakened places of the plastic ring are exposed. These weaknesses are the result of the fact that a fastening ring now requires it to be provided with fixing devices for circumferential movement in the can.

Disse fikseringsanordninger er nødvendige af den grund, at man ved trækning af de rør, som skal sluttes til dåsen, af praktiske grunde ikke kan trække rørene i en sådan stilling, at dåsen altid bliver orienteret på den med de forhåndenværende lokale omstændigheder forenelige måde. Disse lokale omstændigheder kan f.eks. bestå i ønsket om, at et i dåsen indsat apparat skal vende sit effektive organ (huller i en vægtilslutningskontakt, drejeknappen i en drejeknapafbryder ved apparatdåser, overklistrede tapeter ved låget til en koblingsdåse) i en bestemt retning. Apparatsoklen, henholdsvis dåselåget til en 3 146838 apparat- henholdsvis koblingsdåse fastgøres jo som nævnt i det foregående ved hjælp af skruer, som går gennem fastgørelsesringen, og for at sikre opfyldelsen af det nævnte krav skal fastgørelsesringen derfor dels være drejelig i dåsen, dels også være fikserbar i den indstillede stilling, således at en yderligere drejning af fastgørelsesringen ikke skal kunne fremkomme, efter at fastgørelsesskruerne er spændt til.These fixing devices are necessary because, for practical reasons, the tubes to be connected to the can cannot be pulled to the position in such a way that the can is always oriented in the manner compatible with the local conditions at hand. For example, these local circumstances consist in the desire for a device inserted in the can to turn its effective means (holes in a wall connection switch, the knob in a dial switch at device cans, over-pasted wallpaper at the lid to a switch box) in a particular direction. The device socket, respectively, the can lid of a device and coupling box, respectively, is fastened as mentioned above by means of screws passing through the fastening ring, and in order to ensure fulfillment of said requirement, the fastening ring must therefore be partly rotatable in the can as well as be fixable in the set position so that a further turning of the fastening ring should not occur after the fastening screws are tightened.

Med dette formål for øje har det vist sig nødvendigt at tilvejebringe en eller anden form for indgreb mellem fastgørelsesringen på den ene side og det spor, i hvilket fastgørelsesringen er indlagt, på den anden side. Dette indgreb skal have en sådan beskaffenhed, at det træder i funktion, når fastgørelsesskruerne spændes til, men ved ikke tilspændte fastgørelsesskruer skal indgrebet tillade drejning af fastgørelsesrinaen i dennes spor i indersiden af dåsevæggen.For this purpose, it has been found necessary to provide some form of engagement between the attachment ring on the one hand and the groove in which the attachment ring is inserted on the other hand. This engagement must be such that it becomes operative when the fastening screws are tightened, but by un-tightened fastening screws, the engagement must allow rotation of the fastening ring in its groove on the inside of the can wall.

Indgrebet tilvejebringes normalt ved hjælp af fremspring på den ene del og udsparinger i den anden del, og som er udformet på en sådan måde, at fremspringene er jævnt fordelt tæt efter hinanden på den førstnævnte del, og udsparingerne med samme deling er jævnt fordelt langs omkredsen af den anden del.The engagement is usually provided by means of projections on one part and recesses in the other part, which are formed in such a way that the projections are evenly distributed close to one another on the first part and the recesses with the same partition are evenly distributed along the circumference. of the second part.

Man har allerede foreslået en hel del forskellige radialt rettede profiler til henholdsvis udsparingerne og fremspringene. Det er imidlertid netop på grund af sådanne radialt rettede udsparinger, at de i det foregående nævnte svækninger i første række fremkommer.A number of different radially directed profiles have already been proposed for the recesses and projections, respectively. However, it is precisely because of such radially directed recesses that the aforementioned weaknesses appear in the first place.

I anden række vil deformationer af fastgørelsesringens skruehuller også kunne fremkomme i det tilfælde, at fremspringene er beliggende på fastgørelsesringen, hvis nemlig fastgørelsesringen udsættes for i omkredsretningen virkende kræfter.Secondly, deformations of the screw holes of the fastening ring may also occur in the case that the projections are located on the fastening ring, if the fastening ring is exposed to forces acting in the circumferential direction.

Man har også foreslået forskellige profiler for aksialt rettede fremspring og udsparinger, men disse har vist sig mindre effektive, idet ringen ofte kan udsættes for forskydninger i sporet, og disse forskydninger vil da kunne medføre et forringet indgreb mellem ringen og sporets overside.Various profiles for axially directed projections and recesses have also been proposed, but these have proved less effective, as the ring can often be exposed to displacements in the groove, and these displacements could then cause a deterioration of the ring and the upper side of the groove.

Man kan ganske vist uden større vanskelighed anbringe de aksiale fremspring på undersiden af den fals, som opadtil begrænser sporet, og de aksiale udsparinger på ringen, men det er også muligt, omend med et noget mere kompliceret værktøj, at anvende den omvendte disposition. Hvis nu udsparingerne er anbragt i fastgørelsesringe'ns materiale, så medfører de på den i det foregående angivne måde svækninger af fastgørelsesringen, som vil kunne foranledige den i det foregående nævnte deformation af en af plast fremstillet fastgørelsesring.Although the axial protuberances can be placed on the underside of the crease which upwards the groove and the axial recesses on the ring without much difficulty, it is also possible, albeit with a somewhat more complicated tool, to use the reverse disposition. If the recesses are now placed in the material of the fastening ring, then in the above-mentioned manner they cause weakening of the fastening ring, which may cause the aforementioned deformation of a plastic ring made in the foregoing.

4 1468384 146838

Ganske vist er også dåsen fremstillet af plast, men der er ikke nogen vanskelighed forbundet med at dimensionere den mellem dåsens munding og sporet værende fals på en sådan måde, at den tåler de forekommende påvirkninger, til trods for de eventuelt tilstedeværende svækninger.Admittedly, the can is also made of plastic, but there is no difficulty in sizing it between the mouth of the can and the groove in such a way that it can withstand the influences occurring, despite the possible weaknesses present.

Efter at grunden til, at indgrebet mellem fastgørelsesringen af plast og fastgørelsesskruerne svigter, er blevet klarlagt på denne måde, viste det sig også muligt at råde bod på denne ulempe. Afbødningsmidlet består i, at fremspringene såvel som udsparingerne tildeles en form, som er kileformet på en sådan måde, at den frembyder en komponent i radialretningen, en anden komponent i aksialretningen og en bund, som hælder i forhold til begge disse retninger. Uafhængigt af, om udsparingerne befinder sig i fastgørelsesringen eller i falsen ovenover sporet i dåsen, vil der på grund af den nævnte kileform altid findes materiale tilbage ovenover, henholdsvis under det kileformede spor langs hele den radiale bredde af fastgørelsesringen, henholdsvis falsen. Dette materiale vil derfor bidrage til fastgørelsesringens, henholdsvis falsens styrke og vil modvirke den i det foregående omtalte deformation.After the reason for the failure of the engagement between the plastic retaining ring and the fastening screws has been clarified in this way, it was also possible to remedy this disadvantage. The mitigation means is that the projections as well as the recesses are assigned a shape which is wedge shaped in such a way that it presents one component in the radial direction, another component in the axial direction and a bottom inclined relative to both these directions. Regardless of whether the recesses are in the attachment ring or in the crease above the groove in the can, due to said wedge shape, material will always be found above, respectively, below the wedge-shaped groove along the entire radial width of the fastening ring and the crease, respectively. This material will therefore contribute to the strength of the fastener ring and the seam respectively, and will counteract the deformation mentioned above.

Opfindelsen angår således en elektrisk koblings- og apparatdåse bestående af en cylindrisk dåsevæg og en dåsebund med et i nærheden af dåsens munding beliggende spor eller en sporet erstattende ansats til optagelse af en ring af plast for fastgørelse af et dåselåg eller en sokkel til et i dåsen optaget apparat ved hjælp af skruer, som går gennem gevindhuller i fastgørelsesringen eller i en med fastgørelsesringen samvirkende forstærkningsskive. Indgrebsorganer er anbragt mellem oversiden af fastgørelsesringen og undersiden af den øverste flanke til sporet i form af på en af disse dele anbragte fremspring med regelmæssig deling langs dåsens rundgående omkreds, og på den anden af delene anbragte udsparinger med samme deling.The invention thus relates to an electrical coupling and apparatus box consisting of a cylindrical can wall and a can bottom with a groove located near the mouth of the can or a groove replacer for receiving a ring of plastic for attaching a can lid or socket to a can in the can receiving apparatus by means of screws passing through threaded holes in the fastening ring or in a reinforcing disc cooperating with the fastening ring. Engaging means are disposed between the upper side of the attachment ring and the underside of the upper flank to the groove in the form of projections with regular splits arranged on one of these portions along the circumferential circumference of the can, and on the other of the parts recesses having the same pitch.

Opfindelsen er kendetegnet ved, at fremspringene, henholdsvis udsparingerne har et på en sådan måde kileformet profil, at de tilvejebringer en formkomponent i dåsens radiale retning og en formkomponent i dåsens aksiale retning, dog således at de kileformede udsparinger ikke går helt gennem ringen, henholdsvis den ovenover sporet værende fals.The invention is characterized in that the projections or recesses, respectively, have a wedge-shaped profile such that they provide a mold component in the radial direction of the can and a mold component in the axial direction of the can, however, so that the wedge-shaped recesses do not pass completely through the ring or the Above the track were folds.

Opfindelsen skal herefter forklares nærmere under henvisning til et par på tegningen viste udførelseseksempler, men det vil forstås, at opfindelsen ikke er begrænset til disse særlige udførelseseksempler, men at mange forskellige tilpasninger kan forekomme indenfor opfindelsens rammer. Det skal specielt påpeges,at fremspringe- e 146338 5 ne ved de viste udførelseseksempler er anbragt på falsens underside, men det vil være klart for fagmanden, at den modsatte disposition også er mulig. Grunden til den valgte disposition er, at denne kræver de simpleste støbeværktøjer, hvorimod den modsatte disposition kræver lidt mere komplicerede støbeværktøjer. Den er dog fuldt ud gennemførlig.The invention will then be explained in more detail with reference to a few embodiments shown in the drawing, but it will be understood that the invention is not limited to these particular embodiments, but that many different adaptations may occur within the scope of the invention. In particular, it should be pointed out that in the embodiments shown, the projections are arranged on the underside of the seam, but it will be clear to those skilled in the art that the opposite arrangement is also possible. The reason for the chosen disposition is that it requires the simplest casting tools, whereas the opposite disposition requires slightly more complicated casting tools. However, it is fully feasible.

På tegningen viser: fig. 1 et aksialsnit gennem en dåse, som er tilpasset en dåsering ifølge den ene af de i det foregående nævnte udførelsesformer, fig. 2 i forstørret målestok en del af fig. 1, som er omgivet med en cirkel II, fig. 3 et snit af den del af en fastgørelsesring, som er fremstillet af plast. Figuren viser denne del af fastgørelsesringen i en målestok, som svarer til den i fig. 2 anvendte, fig. 4 i forstørret målestok en del af fastgørelsesringen i fig. 3 set oppefra i retning af pilen IV i fig. 3. Ved konstruktionen ifølge fig. 3 og 4 er den kileformede udsparing i fastgørelsesringen anbragt ved dennes ydre omkreds, fig. 5 en lidt ændret udførelsesform for fastgørelsesringen, ved hvilken udsparingen har form som en kvart kugle og er anbragt ved fastgørelsesringens indre rundgående kant, og fig. 6 et til fig. 4 svarende billede set oppefra i retning af pilen VI i fig. 5 af en del af fastgørelsesringen ifølge fig. 5.In the drawing: FIG. 1 shows an axial section through a can adapted to a can ring according to one of the above mentioned embodiments; 2 is an enlarged scale of a portion of FIG. 1, which is surrounded by a circle II; 3 is a sectional view of the part of an attachment ring made of plastic. The figure shows this part of the attachment ring on a scale that corresponds to the one in fig. 2; FIG. 4 is an enlarged portion of the attachment ring of FIG. 3 from above in the direction of arrow IV in FIG. 3. In the construction according to FIG. 3 and 4, the wedge-shaped recess in the attachment ring is arranged at its outer circumference; 5 shows a slightly altered embodiment of the fastening ring, in which the recess has the shape of a quarter ball and is arranged at the inner circular edge of the fastening ring; and FIG. 6 is a view of FIG. 4 is a top view in the direction of arrow VI in FIG. 5 of a portion of the attachment ring of FIG. 5th

De viste dåser består på sædvanlig måde af en væg 10 og en bund 11. I dåsevæggen og/eller dåsebunden er der tilvejebragt et antal åbninger eller åbningsanvisninger i forbindelse med rørstudse for tilslutning af rør, som ankommer til, henholdsvis udgår fra dåsen. Der er på tegningen kun vist tre sådanne rørstudse 12,13 og 14, men det vil for enhver fagmand være klart, hvorledes sådanne rørstudse hensigtsmæssigt bør anbringes. Den viste dåse er desuden forsynet med fastgørelsesorganer for dåsens fastgørelse til et vægskelet, en forskalling til betonstøbning, et bjælkelag, et skeletværk eller lignende, f.eks. i form af parallelt med dåsens akse gående sømhuller 15 og 16 og/eller parallelt med dåsebunden gående sømhuller 17 og 18.The cans shown in the usual way consist of a wall 10 and a bottom 11. In the can wall and / or the bottom of the can a number of openings or opening instructions are provided in connection with pipe nozzles for connecting pipes arriving and leaving the can respectively. Only three such pipe nozzles 12, 13 and 14 are shown in the drawing, but it will be clear to those skilled in the art how such pipe nozzles should be conveniently placed. The can shown is further provided with fastening means for attaching the can to a wall skeleton, a formwork for concrete casting, a beam layer, a skeleton or the like, e.g. in the form of seam holes 15 and 16 running parallel to the axis of the can and / or parallel seam holes 17 and 18 running parallel to the can.

Nær dåsens munding 19 er der tilvejebragt en skråt rettet flanke 20 for at lette indskydningen af fastgørelsesringen. Under denne flanke 6 146838 20 findes det egentlige ringoptagende spor 21. Sporet 21 er fortrinsvis fremstillet i tilslutning til dåsens støbning af plast. Sporet 21 har i dette tilfælde et i hovedsagen paralleltrapezformet tværsnit, således at det har en hældende flanke 22, en cylindrisk del 23 og en i modsat retning hældende flanke 24, jfr. fig. 2.Near the mouth 19 of the can, an inclined flank 20 is provided to facilitate the insertion of the attachment ring. Beneath this flank 6 is the actual ring-receiving groove 21. The groove 21 is preferably made in connection with the plastic molding of the can. In this case, the groove 21 has a substantially parallel trapezoidal cross-section such that it has an inclined edge 22, a cylindrical portion 23 and an opposite slope 24, cf. FIG. 2nd

Hensigten er, at man ved hjælp af den hældende flanke 20 skal kunne indskyde fastgørelsesringen i en i det mindste til at begynde med tilnærmelsesvis diagonalretning i dåsen, således at fastgørelsesringen på et punkt langs sin omkreds kommer til at ligge i sporet 21, samt at man derefter skal løfte den nederste del af fastgørelsesringen op under glidning over flanken 24, således at fastgørelsesringen i sin helhed kommer til at ligge i sporet 21. Den cylindriske del 23 skal herunder naturligvis have en sådan udstrækning i aksial retning, at fastgørelsesringen har spillerum i sporet i aksial retning, da indgrebet ellers ikke vil kunne etableres og påny ophæves mellem fastgørelsesringen og sporets flanke 22. Også et vist radialt spillerum er imidlertid uundgåeligt i praksis.It is intended that by means of the inclined flank 20 it should be possible to insert the attachment ring at least initially with approximately diagonal direction in the can, so that the attachment ring at a point along its circumference lies in the groove 21, and then the lower part of the attachment ring must be raised while sliding over the flank 24, so that the attachment ring as a whole will lie in the groove 21. The cylindrical part 23 must, of course, have such an axial extension that the attachment ring has clearance in the groove. in the axial direction, since otherwise the intervention will not be able to be established and resumed between the attachment ring and the edge of the groove 22. However, some radial clearance is also inevitable in practice.

Sporets flanke 22 er her vist hældende, men det er ikke uomgængeligt nødvendigt for opfindelsen, at den hælder. Den kan derfor også være plan og ligge i et plan, som er parallelt med dåsemundingen 19's plan.The flank 22 of the groove is shown inclined here, but it is not indispensable for the invention to incline. It can therefore also be planar and lie in a plane parallel to the plane of the can orifice 19.

Ved den viste udførelsesform for opfindelsen er udsparingerne 26 således tilvejebragt i fastgørelsesringen, og fremspringene 27 er anbragt på sporet 21's flanke 22, men den modsatte disposition kan også forekomme. I fig. 3 er der, således som nævnt i det foregående, vist et snit gennem fastgørelsesringen, og denne ring er betegnet med 25. I dens yderkant er der tilvejebragt udsparinger med kileform 26 for samvirkning med fremspring 27 på flanken 22. På passende steder langs fastgørelsesringen 25's omkreds er der tilvejebragt fortykkelser 28, hvorigennem der er tilvejebragt huller 28' til optagelse af fastgørelsesskruerne. Under de fortykkede dele strækker der sig en beskyttelseskappe 29 nedefter for at forhindre direkte berøring mellem skruen og de i dåsens indre værende elektriske ledninger.Thus, in the illustrated embodiment of the invention, the recesses 26 are provided in the attachment ring and the projections 27 are arranged on the flank 22 of the groove 21, but the opposite arrangement may also occur. In FIG. 3, as mentioned above, a section through the attachment ring is shown, and this ring is indicated by 25. At its outer edge, recesses with wedge shape 26 are provided for cooperating with projections 27 on the flank 22. At suitable locations along the attachment ring 25 perimeter, thickening 28 is provided through which holes 28 'are provided for receiving the fastening screws. Underneath the thickened parts, a protective cap 29 extends downwardly to prevent direct contact between the screw and the electrical wires located inside the can.

Til forstærkning af plastringens gevind kan man udforme det egentlige skruehul 28' fritgående gennem plastringen og under plastringen og eventuelt indfældet i denne lægge en lille skive af metal 30, hvis hul 31 er forsynet med indvendigt gevind svarende til skruegængerne.To reinforce the threads of the plastic ring, the actual screw hole 28 'can be formed freely through the plastic ring and under the plastic ring and optionally inserted into it a small disc 30 of metal 30, whose hole 31 is provided with an internal thread corresponding to the screw threads.

Det vil nu tydeligt forstås, at selv om der i plastringen 25 er vist en forsænkning 32 til skruehovedet, kræves en sådan forsænkning ikke. Den har kun til formål at optage skruehovedet, så længe 7 146838 dåsen ikke er monteret med sokkel eller dåselåg fastgjort til dåsen, men når soklen, henholdsvis dåselåget fastgøres, vil skruens hoved naturligvis komme til at hvile mod oversiden af soklen, henholdsvis af dåselåget. Uafhængigt af, om gevindene er tilvejebragt i plastringen 25 eller i en forstærkningsskive 30, vil fastgørelsesringen 25 ved tilspænding af fastgørelsesskruen blive trukket opefter, således at der tilvejebringes et indgreb mellem udsparingerne 26 og tænderne 27. Herefter kan soklen til apparatenhedén,.. henholdsvis dåselåget ikke drejes. Disse dele vil derfor vedvarende indtage de stillinger, som de er blevet tildelt ved drejning af fastgørelsesringen 25 før deres fastskruning.It will now be readily understood that although a recess 32 for the screw head is shown in the plastic ring 25, such recess is not required. It is only intended to receive the screw head as long as the can is not mounted with a socket or can lid attached to the can, but when the socket or can lid is attached, the screw head will naturally rest against the top of the socket or can lid respectively. Regardless of whether the threads are provided in the plastic ring 25 or in a reinforcing disk 30, the fastening ring 25 will be pulled upwards by tightening the fastening screw, so that an engagement is provided between the recesses 26 and the teeth 27. The cap of the device unit, respectively, can then be closed. do not turn. These parts will therefore permanently occupy the positions assigned to them by turning the attachment ring 25 prior to their fastening.

Ved konstruktionen ifølge fig. 5 og 6 er fremspringene, henholdsvis udsparingerne udformet med et profil, som her er betegnet som kvartkugleformet. Det er naturligvis ikke nødvendigt,at den kvarte kugle har et profil svarende til en fjerdedel af en kugle, idet den lige så godt kan have form som en fjerdedel af en ellipsoide, en ovaloide eller et lignende legeme. Udsparingen 33 er i dette tilfælde tilvejebragt i den i det valgte eksempel plane overside af sporet 21, medens fremspringene 34 er tilvejebragt på oversiden af fastgørelsesringen 25.In the construction of FIG. 5 and 6, the projections and recesses respectively are formed with a profile, which is referred to here as quarter-shaped. Of course, it is not necessary for the quarter ball to have a profile corresponding to a quarter of a ball, as it may be as good as a quarter of an ellipsoid, ovaloid or similar body. In this case, the recess 33 is provided in the flat top face of the groove 21 in the selected example, while the projections 34 are provided on the upper side of the fastening ring 25.

I kraft af denne konstruktion opnår man betydelige fordele, af hvilke der i første række skal nævnes følgende: Såfremt fastgørelsesringen har spillerum i aksial retning i sporet, sker der en orientering ved hjælp af den skrå flanke i udsparingerne, henholdsvis på fremspringene. En forbedret indglidning af fremspringene i udsparingerne sker ved hjælp af den kileform, som henholdsvis udsparingerne og fremspringene er tildelt,på en sådan måde, at hvis et fremspring tilfældigvis skulle komme til at ligge an mod et sted midt mellem to udsparinger, fremtvinges der en forskydning i omkredsretningen. Da udsparingerne er tilvejebragt i den af plast fremstillede fastgørelsesring, forekommer der i denne ring ikke nogen gennemgående svækning i forbindelse med udsparingerne, og man behøver heller ikke at frygte nogen deformation af plastringen med deraf følgende svigten, hvad angår gevindforbindelsen.By virtue of this construction, considerable advantages are obtained, of which the first must be mentioned: If the fastening ring has clearance in the axial direction in the groove, an orientation is made by means of the inclined edge of the recesses and the projections, respectively. Improved sliding of the projections into the recesses is effected by the wedge shape assigned to the recesses and the projections, respectively, in such a way that if a projection should accidentally touch a spot in the middle between two recesses, a displacement is forced in the circumferential direction. Since the recesses are provided in the plastic retaining ring, there is no continuous weakening in this ring in connection with the recesses, nor is there any need to fear any deformation of the plastic ring with the resulting failure in the thread connection.

Det er endvidere klart, at der ikke fremkommer nogen forskel, hvad angår virkningen af de nævnte dele, såfremt man i stedet for den på tegningen viste udformning tilvejebringer fremspringene på den af plast fremstillede fastgørelsesring og tilvejebringer udsparingerne i kanten af sporet 21's flanke 22. Denne flanke bør imidlertid herunder fortrinsvis være plan.Furthermore, it is clear that no difference will be apparent in the effect of the said parts if, instead of the design shown in the drawing, the projections are provided on the plastic retaining ring and provide the recesses at the edge of the flank of the groove 21. however, the flank should preferably be planar including.

8 1468388 146838

Afhængigt af fastgørelsesringens radiale bredde kan fremspringene og udsparingerne således være tilvejebragt enten ved den indre eller den ydre omkreds. Den mindste forringelse af fastgørelsesringens styrke opnår man, hvis udsparingerne, henholdsvis fremspringene findes på denne rings inderside.Thus, depending on the radial width of the attachment ring, the projections and recesses may be provided either at the inner or outer circumference. The slightest deterioration of the strength of the fastening ring is obtained if the recesses and the projections are respectively on the inside of this ring.

Claims

146838 9 Patent Claims.

An electrical coupling and apparatus box, consisting of a cylindrical can wall (10) and a can bottom (11) with a groove (21) located adjacent to the mouth of the can (19) or a corresponding abutment for receiving a ring (25) ) of plastic for attaching a can lid or socket to an apparatus received in the can by means of screws passing through threaded holes in the fastening ring (25) or in a reinforcing disc cooperating with the fastening ring, and where between the upper side of the fastening ring (25) 10 and the underside of the upper flange (22) of the groove (21) is provided with engagement means in the form of projections (27) arranged on one of these portions with regular dividing along the circumferential circumference of the can and in the other of the parts recesses (26) having the same partition, characterized in that the projections, respectively the recesses (27, 26), have a wedge shaped profile in such a way that they provide a mold component in the radial direction of the can and a mold component in the axial axis of the can. However, the wedge-shaped recesses do not pass completely through the ring (25) or the fold (21) above the groove, respectively. 20

A can according to claim 1, characterized in that the projections or recesses, respectively, are formed as quarter balls or similar rotating bodies.

Box according to claim 1 or 2, characterized in that the recesses (26) are provided in the fastening ring (25) 25 at a depth which is only a fraction of the total thickness of the fastening ring (25).

Box according to claim 3, characterized in that the recesses (26) are provided at the outer edge of the fastening ring (25). 30

5. A box according to one or more of claims 1-3, characterized in that the recesses are provided on the inner edge of the fastening ring (25).

A can according to one or more of claims 1-3, characterized in that the projections are provided on the attachment ring (25) preferably on its inner edge and that the flank (22) facing the groove (21) faces the attachment ring (21). 25) top side, is planar and has recesses corresponding to the projections.