DK161481B

DK161481B - MICROWAVE OVEN WHERE OVEN SPACES AND SWEETS HAVE COMMON PAGES

Info

Publication number: DK161481B
Application number: DK543983A
Authority: DK
Inventors: Ronald W Millman
Original assignee: Litton Systems Inc
Priority date: 1982-11-29
Filing date: 1983-11-28
Publication date: 1991-07-08
Also published as: DK543983D0; HK59488A; EP0110364B1; KR840007169A; IE54739B1; AU576741B2; DK161481C; ZA838604B; IE832658L; AU2145483A; ATE25799T1; DE110364T1; CA1203580A; DK543983A; DE3370118D1; EP0110364A1

Abstract

A low-cost microwave oven construction wherein a single sheet of metal forms both the cooking cavity and the outer wrap. The cavity, components compartment (12), and front and back panels (16, 17) are joined by a continuous crimped seam to form a unitary oven construction.

Description

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DK 161481BDK 161481B

Denne opfindelse omhandler opbygningen af mikrobølgeovne, specielt opbygningen af ovnhulrummet og det ydre svøb. På grund af behovet for at begrænse mikrobølgefrekvensener-gien på en styrbar måde, indeholder næsten alle de hidtil 5 kendte mikrobølgeovne en adskilt kasseagtig del betegnet som tilberedningshulrummet eller simpelthen hulrummet. Hulrummet er fastgjort i en eller anden slags ramme, der rummer resten af de til ovnens funktion nødvendige dele, idet hele apparatet omsluttes af en dekorativ ydre skal, 10 kaldet et svøb.This invention relates to the construction of microwave ovens, in particular the construction of the oven cavity and the outer casing. Due to the need to limit the microwave frequency energy in a controllable manner, almost all the previously known microwave ovens contain a separate box-like portion referred to as the cooking cavity or simply the cavity. The cavity is fixed in some kind of frame which holds the rest of the parts needed for the operation of the furnace, the whole apparatus being enclosed by a decorative outer shell, called a shroud.

En mikrobølgeovn af denne art kendes fra US patentskrift nr. 4 192 431. På grund af den nævnte konstruktion er ovnen ganske voluminøs, og samlingen af den er temmelig 15 dyr.A microwave oven of this kind is known from U.S. Patent No. 4,192,431. Because of the aforementioned construction, the furnace is quite bulky and its assembly is rather 15 animals.

Da der er skarp konkurrence på markedet, er det nødven- . digt at fremstille mikrobølgeovne så økonomisk som muligt. En måde at frembringe en væsentlig fremstillingsbe-20 sparelse er ved at kombinere ovnhulrummet og det ydre svøb i et enkelt element. Den foreliggende opfindelse viser hvorledes en sådan kombination kan udføres, hvilket sammen med andre dele af opfindelsen frembringer en virkelig billig opbygning.As there is fierce competition in the market, it is necessary. poem to produce microwave ovens as economically as possible. One way to achieve significant manufacturing savings is by combining the furnace cavity and outer casing into a single element. The present invention shows how such a combination can be carried out, which together with other parts of the invention produces a really cheap structure.

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Den foreliggende opfindelse beskriver opbygningen af en mikrobølgeovn med et kombineret ovnhulrum og svøb. En enkelt tildannet metalplade foldes for at danne et ovnhulrum, der samtidig frembringer en sidevæg og hoveddelen af 30 top- og bundvæggene for det ydre svøb. En apparatdel tilføjes hulrummet for at tilføje den anden sidevæg og de resterende dele af svøbets top og bund. Hulrummet såvel som for- og bagpanelerne kan samles ved hjælp af krympning, hvorved man udelukker nødvendigheden af svejsning 35 eller andre fastgørelsesteknikker.The present invention describes the construction of a microwave oven with a combined oven cavity and wrapper. A single formed metal sheet is folded to form an oven cavity which simultaneously produces a side wall and the main portion of the top and bottom walls of the outer shell. An appliance part is added to the cavity to add the other side wall and the remaining portions of the top and bottom of the casing. The cavity as well as the front and rear panels can be assembled by shrinkage, eliminating the necessity of welding 35 or other fastening techniques.

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22

Opfindelsen skal nu beskrives nærmere under henvisning til tegningen, hvor fig. 1 er et eksploderet perspektivisk billede, der viser 5 mikrobølgeovnens opbygning ifølge den foreliggende opfindelse, fig. 2 er et perspektivisk billede af den samlede ovn, 10 fig. 3 er et forstørret delvist snit efter linien 3-3 fra fig. 2, der viser en del af krympesømmen, og fig. 4 er et forstørret tværsnit af krympesømmen vist i fig. 3.The invention will now be described in more detail with reference to the drawing, in which fig. 1 is an exploded perspective view showing the structure of the microwave oven of the present invention; 2 is a perspective view of the assembled furnace; FIG. 3 is an enlarged partial sectional view taken on line 3-3 of FIG. 2 showing part of the shrinkage seam; and FIG. 4 is an enlarged cross-section of the shrink seam shown in FIG. Third

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Idet der nu henvises til tegningen, skal en foretrukken udførelsesform af opfindelsen beskrives. Ovnhulrummet 10 er dannet ud af et enkelt fladt metalstykke 1, der er tildannet og foldet således, at der dannes ét i hovedsa-20 gen kasseformet hulrum. Hulrummet 10 indeholder den øvre væg 20, sidevæggen 21, bundvæggen 22 og sidevægsdelene 23 og 24 hver med flangerne 18 og 19. Efter foldning bliver sidevægsdelene 23 og 24 samlet langs med kanten 26 ved hjælp af en krympesøm, hvorved sidevægsdelene foldes over 25 hinanden således, at der dannes en sikker foldesøm af den type, der vises i figurerne 3 og 4. Der forefindes en åbning 25 i “sidevægsdelen 24, og over denne åbning er der fastgjort en bølgeleder 15.Referring now to the drawings, a preferred embodiment of the invention will be described. The furnace cavity 10 is formed from a single flat metal piece 1 which is formed and folded to form one substantially box-shaped cavity. The cavity 10 contains the upper wall 20, the sidewall 21, the bottom wall 22, and the sidewall portions 23 and 24 each with the flanges 18 and 19. After folding, the sidewall portions 23 and 24 are joined along the edge 26 by a shrink seam whereby the sidewall portions fold over each other thus. that a secure folding seam of the type shown in FIGS. 3 and 4. is formed. An opening 25 is provided in the "sidewall portion 24, and over this opening a waveguide 15 is attached.

30 Et apparat 12 bestående af et i hovedsagen "u"-formet metalstykke 2 med en adgangsdel og flangerne 13 og 14 fastgøres til hulrumsdelen 10 ved punktsvejsning langs med flangerne 13 og 14. Bagsidepanelet 17 og forsidepanelet 16 fastgøres nu til hulrummet (apparatrumsenheden). For-35 sidepanelet 16 punktsvejses først til flangerne 18. Bagsidepanelet 17 punktsvejses først til flangerne 19. Der dannes nu en krympesøm langs hele forpanelet 16's omkredsAn apparatus 12 consisting of a generally "u" shaped metal piece 2 with an access portion and the flanges 13 and 14 are secured to the cavity portion 10 by spot welding along the flanges 13 and 14. The back panel 17 and the front panel 16 are now attached to the cavity (apparatus unit). The front 35 side panel 16 is first spot welded to the flanges 18. The rear side panel 17 is first spot welded to the flanges 19. A shrinkage stitch is now formed along the entire circumference of the front panel 16

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3 og hele bagpanelet 17's omkreds, således at for- og bagpanelerne krympes til hulrumselementet 10 og apparatrummet 12. Efter denne krympning fås en mikrobølgeovn med et udseende som vist i fig. 2. Detaljer af krympesømmene er 5 vist i fig. 3 og 4. Efter at de elektroniske dele og andre dele, der er nødvendige for ovnens funktion, er blevet samlet i apparatrummet 12, anbringes der et adgangspanel (ikke vist) over apparatrummet 12 således, at dette lukkes. Adgangspanelet kan fastgøres ved hjælp af 10 pillesikre fastgøringsanordninger. En mikrobølgeovndør (ikke vist) bliver da fastgjort til forpanelet 16 således, at ovnens opbygning afsluttes.3 and the entire circumference of the rear panel 17 so that the front and rear panels are shrunk to the cavity element 10 and the apparatus space 12. After this shrinkage, a microwave oven with an appearance as shown in FIG. 2. Details of the shrink seams are shown in FIG. 3 and 4. After the electronic parts and other parts necessary for the operation of the furnace have been assembled in the apparatus space 12, an access panel (not shown) is placed over the apparatus space 12 so that it is closed. The access panel can be secured using 10 pill-proof fasteners. A microwave oven door (not shown) is then attached to the front panel 16 so that the furnace construction is completed.

Den metalplade af hvilken hulrumselementet 10 er dannet 15 kan overfladebehandles og udsmykkes som ønsket. Den udvendige side af den øvre del 20 og sidevæggen 21 kan da males i en eller anden farve eller dækkes med imiteret træ. Den indvendige side af den samme øvre væg 20 og sidevæg 21 såvel som bundvæggen 22 kan males i en anden 20 farve såsom hvid for at udgøre det indvendige af ovnhulrummet. Imidlertid er det vigtigt at bemærke, at ovnhulrummet og det ydre svøb begge fremkommer af den samme enkelte metalplade, og at der ikke er noget adskilt hulrum og/eller svøb. Det udvendige af apparathulrummet 12 fær-25 diggøres naturligvis på samme måde som den udvendige del af hulrumselementet 10.The metal sheet from which the cavity element 10 is formed can be surface treated and embellished as desired. The outer side of the upper part 20 and the side wall 21 can then be painted in some color or covered with imitation wood. The inner side of the same upper wall 20 and side wall 21 as well as the bottom wall 22 may be painted in another 20 color such as white to form the interior of the furnace cavity. However, it is important to note that the furnace cavity and the outer casing both appear from the same single metal plate and that there is no separate cavity and / or casing. The exterior of the apparatus cavity 12 is, of course, completed in the same manner as the exterior portion of the cavity element 10.

Den beskrevne opbygning frembringer en meget enkel ombygning af en mikrobølgeovn, indeholdende et meget lille an-30 tal dele. Anvendelsen af en fælles hulrumsvæg og ydre svøb reducerer mængden af anvendte materialer i ovnen og gør, at konstruktionen bliver meget simpel. Anvendelsen af krympeteknikker til at samle delene begrænser i meget høj grad anvendelsen af arbejdskraft ved samlingen i for-35 hold til tidligere kendte konstruktioner.The described structure produces a very simple conversion of a microwave oven containing a very small number of parts. The use of a common cavity wall and outer shell reduces the amount of materials used in the furnace and makes the construction very simple. The use of shrinkage techniques to assemble the parts greatly limits the use of labor in the assembly in relation to prior art designs.

Claims

Microwave oven with combined oven cavity and wrapper, characterized in that it comprises: (a) a first formed metal plate (1) folded to form a box-like cavity (10) with open ends, (10) a second formed metal plate (2) attached to one side wall of said cavity (10) such that an apparatus cavity (12), 15 (c) forms a first panel (16) covering both the cavity (10) and and (d) a second panel (17) covering both the cavity (10) 20 and the apparatus cavity (12) so as to provide an oven baking sheet, (e) the first and the second panel (16 and 17) is affixed to the cavity (10) and the apparatus cavity (12) with a continuous shrinkage seam so as to provide an overall unit, whereby the first metal plate (1) forms both the interior walls (20- 24) and parts of the outer casing around the stove. 30

Unit according to claim 1, characterized in that the ends of the first metal plate (1) are assembled along a shrunk seam. 35