SE452680B

SE452680B - Fixture for electrical installation box cover

Info

Publication number: SE452680B
Application number: SE8304712A
Authority: SE
Inventors: B S Kardefeldt; E S Eriksson
Original assignee: Thorsman & Co Ab
Priority date: 1983-08-31
Filing date: 1983-08-31
Publication date: 1987-12-07
Also published as: FI843294A; FI76649B; FI843294A0; NO160170C; FI76649C; SE8304712L; NO843458L; NO160170B; SE8304712D0

Abstract

The box cover comprises a plate (7) and at least two fixation components (8) diametrically opposed on its underside which, in the cover fitted position project into the box opening and connect to a fixture ring located internally. The fixation components (8) comprise two or more pref. individually sprung tongues, each provided with at least one stop tooth (9), of which at least one tooth per fixture engages at the rear of the fixture ring in the cover installed position. Alternatively, the fixture components can comprise arms (8) on which are individually sprung tongues with projecting stop teeth (9). (Provisional Basic advised week 85/16)

Description

15 20 25 452 680 erhålles genom att lockets spärrarmar fjädrar mot dosans insida. Det har emellertid visat sig att det tryck spärrarmarna utöver avtar med tiden till följd av s k kallflytning i plastmaterialet. Efter nägra år kan looken med lätthet avlägsnas utan användande av verktyg. 452 680 is obtained by the locking arms of the lid springing against the inside of the box. However, it has been found that the additional pressure of the locking arms decreases with time as a result of so-called cold flow in the plastic material. After a few years, the look can be easily removed without the use of tools.

REDOGÖRELSE FÖR UPPFINNINGEN Föreliggande uppfinning har till ändamål att anvisa ett helt i plast utfört täcklock, vid vilket de ovan påtalade nackdelarna är eliminerade och som därmed uppfyller i gällande bestämmelser ställda krav pà täcklock. Detta ändamål uppnås enligt uppfinningen genom att täcklocket givits de i efter- följande patentkrav angivna kännetecknen.DISCLOSURE OF THE INVENTION The object of the present invention is to provide a cover made entirely of plastic, in which the above-mentioned disadvantages are eliminated and which thus meet the requirements for cover covers set in the current regulations. This object is achieved according to the invention by giving the cover the characteristics specified in the following claims.

F IGURBESKRIVNING Ett utföringsexempel av uppfinningsföremalet skall i det följande beskrivas under hänvisning till bifogade ritning, i vilken fig. l visar i genomskärning en i en skivvägg infälld och med täcklock enligt uppfinningen försedd installations- dosa. Fig. 2 visar locket separat sett från sidan, fig. 3 visar locket i en vy A-A enligt fig. 2 och fig.4 visar en uppförstorad detalj av en spärrtand i ett tvärsnitt efter linjen B-B i fig. 2. Fig. 5 slutligen visar locket sett rakt underifrån.DESCRIPTION OF THE DESCRIPTION An embodiment of the object of the invention will be described in the following with reference to the accompanying drawing, in which Fig. 1 shows in cross section an installation box recessed in a disc wall and provided with a cover according to the invention. Fig. 2 shows the lid separately seen from the side, Fig. 3 shows the lid in a view AA according to Fig. 2 and Fig. 4 shows an enlarged detail of a ratchet tooth in a cross section along the line BB in Fig. 2. Fig. 5 finally shows the lid seen straight from below.

FÖREDRAGEN UTFÖRINGSFORM Fig. l visar i genomskärning en i en skivvägg 12 infälld och med ett täcklock 1 försedd dosa 2. Dosan omfattar ett hölje 3 i form av en i ena änden öppen cylinder samt en i ett ej visat spar runt höljets insida intill dess öppning vridbart anordnad fästring 6, vars mot dosbotten li vända baksida bildar ett plan parallellt med planet genom botten 4. Dosan är vidare försedd med stutsar 5 för anslutning av installationsrör.PREFERRED EMBODIMENT Fig. 1 shows in cross section a box 2 recessed in a disc wall 12 and provided with a cover lid 1. The box comprises a housing 3 in the form of a cylinder open at one end and a groove (not shown) around the inside of the housing next to its opening. rotatably arranged fastening ring 6, the rear side of which faces the dose base 1, forms a plane parallel to the plane through the bottom 4. The box is further provided with sockets 5 for connecting installation pipes.

Det i fig. 2 separat visade locket som är utfört i elastiskt material, före- trädesvis plast, omfattar en plan täckskiva 7 och pa dess ena sida, undersidan, anordnade fästorgan 8, som sträcker vinkelrätt ut fran täckskivan 7 och som är utformade att i lockets monterade läge skjuta in i och ansluta 'till fästringen 6. 10 15 20 25 30 4520680 Det visade utföringsexemplet innefattar tva diametralt motsatt anordnade fästorgan i form av fästarmar 8 med sex pa respektive fästarm 8 anordnade individuellt fjädrande tungor med i riktning mot lockperiferien utskjutande spärrtänder 9. Tungorna, som är placerade i individuella urtag i respektive fästarm, utgar fran fëstarmens fria ände och är anordnade sa att spärrtändernas mot täckskivan vända och med denna parallella anliggningsytor 10 är belägna pa olika avstånd fran täckskivan. Var och en av spärrtänderna omfattar vidare en snedställd glidyta ll, som vid införandet av fästarmarna i dosöppningen bringar tungorna med spärrtänderna 9 att fjädra in mot lockets centrum.The lid shown separately in Fig. 2, which is made of elastic material, preferably plastic, comprises a flat cover plate 7 and on its one side, the underside, arranged fastening means 8, which extend perpendicularly out from the cover plate 7 and which are designed to the mounted position of the cover slides into and connects to the fastening ring 6. The embodiment shown comprises two diametrically opposite fastening means in the form of fastening arms 8 with six individually resilient tongues arranged on each fastening arm 8 with locking teeth projecting in the direction of the lid periphery. 9. The tongues, which are placed in individual recesses in each mounting arm, emanate from the free end of the mounting arm and are arranged so that the locking teeth face the cover plate and with this parallel abutment surfaces 10 are located at different distances from the cover plate. Each of the locking teeth further comprises an inclined sliding surface 11, which upon insertion of the fastening arms into the dose opening causes the tongues with the locking teeth 9 to spring towards the center of the lid.

När locket l anbringas över öppningen pa dosan 2 förs fästarmarna 8 ned i öppningen till dess att täckskivan 7 stöder mot en väggskiva 12 bakom vilken dosan 2 är anbringad. Spärrtänderna 9 trycks in mot lockets l centrum genom respektive urtag i fästarmarna 8 när de passerar fästringen 6 genom den lutande glidytans ll tryck mot fästringen 6 och fjädrar ut igen pa ringens 6 baksida da de passerat denna. De spärrtänder9 som inte passerar fästringenó förblir intryckta i respektive urtag i fästarmarna 8. Den plana anliggningsytan 10 pa den fria spärrtand som befinner sig närmast fästringen 6 anligger mot dennas baksida och utgör en spärr för lockets l utdragning med den maximala kraft som anges i gällande bestämmelser.When the lid 1 is fitted over the opening on the box 2, the fastening arms 8 are lowered into the opening until the cover plate 7 abuts against a wall plate 12 behind which the box 2 is fitted. The ratchet teeth 9 are pressed towards the center of the cover 1 through respective recesses in the fastening arms 8 when they pass the fastening ring 6 through the pressure of the inclined sliding surface 11 against the fastening ring 6 and spring out again on the back of the ring 6 when they have passed it. The locking teeth 9 which do not pass the fastening ring remain pressed into the respective recesses in the fastening arms 8. The flat abutment surface 10 of the free locking tooth which is closest to the fastening ring abuts against its back and forms a barrier for the extension of the lid with the maximum force specified in current regulations. .

För att möjliggöra lockets demontering är täckskivan utförd som ett membran med en runt täckskivans periferi pa dess undersida löpande kant 13. Om man med ett verktyg, exempelvis en skruvmejsel, som pressas in mellan lock- kanten 13 och väggen 12 bänder upp locket, böjs genom täckplattans 7 elastiska deformation fästarmarna 8 mot lockets centrum och spärrtëndernas 9 ingrepp bakom fästringen 6 släpper eller försvagas, sa att locket kan lyftas bort.To enable the cover to be disassembled, the cover plate is designed as a membrane with a circumferential edge 13 running around the underside of the cover plate on its underside. If a tool, for example a screwdriver, which is pressed in between the lid edge 13 and the wall 12 the elastic deformation of the cover plate 7 the fastening arms 8 towards the center of the lid and the engagement of the locking teeth 9 behind the fastening ring 6 release or weaken, so that the lid can be lifted off.

Genom spärrtändernas 9 placering pa olika avstand fran täckskivan 7 kan locket bringas att fästa vid olika tjocka fästringar 6 saväl som vid pa olika djup under väggskivan 12 anordnade dosor 2. Den av nivaskillnaden mellan tändernas an- liggningsytor 10 förorsakade diskontinuiteten överbryggas av täckplattans ~ elasticitet. Skulle, när täckplattans kant anbringats mot' väggen, inget lämpligt tandingrepp erhallas bakom fästringen 6, kan den membranliknande täckplattan bringas att fjädra ner tills ett tandingrepp, som ger önskad vägganslutning erhalles. Täckplattans fjädringsbarhet motsvarar en tanddelning och uppfin- 452 680 ningsföremàlets anslutning till en dosa omgivande vägg är därmed inte stegvis utan kontinuerligt inställbar.By placing the locking teeth 9 at different distances from the cover plate 7, the lid can be made to attach to different thick fastening rings 6 as well as to boxes 2 arranged at different depths under the wall plate 12. The discontinuity caused by the level difference between the abutment surfaces 10 of the teeth is bridged by the cover plate elasticity. Should, when the edge of the cover plate is applied to the wall, no suitable tooth engagement be obtained behind the fastening ring 6, the membrane-like cover plate can be caused to spring down until a tooth engagement which gives the desired wall connection is obtained. The resilience of the cover plate corresponds to a tooth pitch and the connection of the object of the invention to a box surrounding wall is thus not stepwise but continuously adjustable.

Genom att man pa ett applicerat lock inte utnyttjar fjädringen i tungorna till de i ingrepp med fästringen 6 varande spärrtänderna 9 elimineras vid täcklocket enligt uppfinningen risken för kallflytning i materialet och därmed även risken för lossnande lock. Vidare medger spärrtändernas 9 relativt långa anliggnings- yta 10 att fästringens 6 inre öppning kan fä variera inom ett relativt stort intervall.By not utilizing the suspension in the tongues of the locking teeth 9 in engagement with the fastening ring 6 on an applied cover, the risk of cold flow in the material and thus also the risk of loosening cover is eliminated at the cover cover according to the invention. Furthermore, the relatively long abutment surface 10 of the ratchet teeth 9 allows the inner opening of the fastening ring 6 to vary within a relatively large range.

Claims

452 eso PATENTKRAV

Cover cover with fastening means, preferably for electrical installation boxes with an inner fastening ring (6) or equivalent arranged near the dose opening, which cover comprises a cover plate (7) and at least two fastening diametrically opposite fastening means (8) on the underside of the cover plate (7) mounted position slide into the dose opening and connect to the fastening ring (6), characterized in that the respective fastening means (8) comprise two or more preferably individually resilient tongues, each provided with at least one locking tooth (9) and of which at least one locking tooth (9) belonging to each fastening member (8) is intended to engage behind the fastening ring (6) in the mounted position of the lid.

Z. Cover cap according to claim 1, characterized in that the fastening means comprise fastening arms (8) with tongues arranged individually thereon and provided with projecting locking teeth (9).

Cover cap according to claims 1-2, characterized in that the locking teeth (9) are provided with abutment surfaces (10) facing the cover plate (7), the abutment surfaces of the locking teeth (9) within the respective fastening means (8) being arranged on different distance from the cover plate (7).

Cover cover according to claims 1-3, characterized in that the abutment surface (10) of each locking tooth (9) is flat and parallel to the plane through the cover plate (7).

Cover cap according to claims 1-4, characterized in that the locking teeth (9) assigned individually resiliently and the tongues arranged in recesses start from the free end of each fastening arm.

Cover cover according to claims 1-5, characterized by a circumferential edge (13) arranged around the cover plate (7) on its underside, through which the cover plate (7) in the mounted position of the cover (1) lies free from the substrate and can be brought to spring to adjust the engagement of the locking teeth (9) behind the fastening ring (6).