WO1999001603A1 - Household appliance with a stainless steel subassembly - Google Patents

Household appliance with a stainless steel subassembly Download PDF

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Publication number
WO1999001603A1
WO1999001603A1 PCT/EP1998/003515 EP9803515W WO9901603A1 WO 1999001603 A1 WO1999001603 A1 WO 1999001603A1 EP 9803515 W EP9803515 W EP 9803515W WO 9901603 A1 WO9901603 A1 WO 9901603A1
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WO
WIPO (PCT)
Prior art keywords
attachments
household appliance
main part
stainless steel
parts
Prior art date
Application number
PCT/EP1998/003515
Other languages
German (de)
French (fr)
Inventor
Abdolvahed Bestanpouri
Norbert Wargulski
Peter Setecki
Stephan Malcher
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to DE59802745T priority Critical patent/DE59802745D1/en
Priority to BR9810640-6A priority patent/BR9810640A/en
Priority to EP98937470A priority patent/EP0993518B1/en
Priority to AT98937470T priority patent/ATE209269T1/en
Publication of WO1999001603A1 publication Critical patent/WO1999001603A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • D06F37/10—Doors; Securing means therefor

Definitions

  • the invention relates to a household appliance with a multi-part assembly made of sweat-stabilized stainless steel, in particular a washing machine with a stainless steel washing drum that can be loaded on the jacket side, the drum lid of which has attached parts, such as hinges, hooks, etc., which are permanently attached.
  • Such a household appliance is known from DE 22 37 410 C3, although no sweat-stabilized stainless steel had to be used therein.
  • the drum lid of this washing machine which can be loaded on the jacket side, is made of stainless steel and contains attachments such as hinges, hooks, etc. These attachments are permanently attached to the main part, namely the drum cover, by riveting.
  • Such constructions of assemblies are too complex to manufacture.
  • the main part and the attachments require dimensionally accurate and congruent hole patterns; they have to be brought into a congruent position for fastening and require the attachment of several individual rivets, which are usually designed as tubular rivets. Then the immediate fastening process also requires a lot of force to set the rivet.
  • the object of the invention is to avoid complex connections, such as riveted connections, in a household appliance mentioned at the outset, without having to use higher-quality materials or accepting the risk of rusting in long-term operation.
  • this object is achieved in that the attachments are fastened to the main part of the assembly by laser welds.
  • Recent findings in the welding technology of laser welding allow localized welding on relatively thick sheet metal parts even with multiple layers. When used in household appliances, such welded joints result in very clean and durable joints that prevent intergranular corrosion even on stainless steel that is not of particularly high quality.
  • the invention can be further developed in that the laser weld seams are interrupted like a quilting seam. Such interruptions have proven to be particularly advantageous in that the welds are less susceptible to corrosion. It has been found that due to the stitch-like interruption of the weld seams, the individual weld seam sections form electrical potentials with one another which neutralize one another and thereby counteract corrosion. This effect is most evident when the laser welds are set in pairs. The least difficulties with regard to the formation of corrosion are also to be expected if the main part and the add-on parts consist of a uniform stainless steel alloy. This is the best way to ensure that the materials of the add-on parts and the main part merge homogeneously during laser welding.
  • the invention is developed further by means of embossments which correspond in the correct position on the main part and / or on the add-on parts with counter-embossments or recesses on the respective part to be connected. This is the easiest way to align and fix the parts to each other.
  • the embodiment of the invention can be improved in that the main part has embossments at the locations of the attachments, the surfaces of which are congruent with the surfaces of the attachments to be connected and which are as deep as the thickness of the attachments.
  • the attachments can be connected so that they are flush so that their surfaces are flush with the surface of the main part.
  • a particularly advantageous method for connecting attachments to a main part of a multi-part assembly made of weld-stabilized stainless steel of a household appliance, in particular a washing machine with a stainless steel laundry drum, whose drum cover has attached attachments, such as hinges, hooks, etc., which are permanently attached is characterized in that Add-on parts are temporarily mechanically fixed in their connecting position on the main part and are then inseparably fused to the material of the main part by the action of a laser beam at spatially limited locations.
  • the method according to the invention can be developed in a particularly advantageous manner in that the laser beam is guided along the seam line during the welding process and temporarily interrupted. This results in quilt-like welds of their own accord.
  • an inert protective gas is supplied in a particularly advantageous manner as the working gas.
  • Such an inert gas can be argon or helium. It prevents that
  • assemblies produced according to the invention become more stable in their connections; because it has been shown that there are no pronounced bulges of sheet metal parts welded according to the invention on the covers of washing machine that can be charged with the jacket during the spin cycle. Such effects have often resulted in contact by means of additional connecting means, for example hollow rivets, for touching the heating in the tub through parts of the drum shell, in particular the drum cover.
  • additional connecting means for example hollow rivets
  • a purity in the material used for such assemblies can be achieved, which is not possible with other connection technologies because additional connection means introduce other materials. This aspect is important for the separation of materials when disposing of products that are equipped with such assemblies.
  • the invention is explained below using an exemplary embodiment shown in the drawing.
  • the drawing shows a section of a jacket area 2 of a laundry drum 1 that can be loaded on the jacket side, in which a cover that allows access to the interior of the laundry drum is installed and sheared.
  • the lid is in two parts, has a so-called lower lid 3 with hooks 4 attached near its free end and a so-called upper lid 5 with eyelets 7 attached near the free edge 6. Since the lid parts 3 and 5 are narrower than the access opening in FIG Laundry drum 1, the edges 18 and 19 are at a distance from the attached edge strips 20 at the access opening. The cover parts can therefore pass through the access opening.
  • Hooks 4 and eyes 7 engage in the closed state of the lid 3, 5 and successfully counteract opening forces.
  • opening forces are achieved, on the one hand, by springs 9, which are built into the hinges 10 of the two cover parts 3 and 5, with which the cover parts are pivotally attached to the edges of the access opening for the laundry drum lying parallel to the drum axis.
  • lid opening forces are caused by items of laundry lying in the drum, which are exposed to a centrifugal force in particular when spinning.
  • catch hooks are attached to the upper sides of the cover parts 3 and 5, which catch on the edges of a filling shaft, not shown, when the laundry drum should rotate when the cover parts 3 and 5 are open.
  • the cover parts are the respective main parts; all together form the assemblies 3 to 8 and 11.
  • the jacket part 2 of the laundry drum 1 in turn forms a further main part, to which the fixed parts 12 of the hinges 10 are provided as add-on parts.
  • the jacket part 2 of the laundry drum 1 together with the lined cover parts 3 and 5 forms the parent
  • Both the hinge parts 11 and 12 as well as the other add-on parts (hooks 7 and 8) are connected to the respective main parts (drum shell part 2, cover parts 3, 5) by welded connections, which are indicated by short lines 13, 14.
  • the indicated weld seam sections 13 on the one hand and 14 on the other are in alignment with one another; the respective
  • weld seam sections 13 are parallel to the adjacent weld seam sections 14. Welding seam sections lying in parallel each form a potential pair, each between 15 and 20 mm in length, and allow equipotential bonding when applied with an electrolyte (eg a wash liquor). This arrangement advantageously avoids the formation of corrosion in the weld area.
  • an electrolyte eg a wash liquor.
  • This arrangement advantageously avoids the formation of corrosion in the weld area.
  • downward-facing embossments 16 are visible, which fit into corresponding, invisible recesses on the cover part 3.
  • the hooks 4 can be pre-fixed in the correct position before welding, without having to be specially positioned by external measures.
  • the cover parts At the locations of the catch hooks 8, which are connected to the cover part 3 or to the cover part 5, the cover parts have embossings 17, the surfaces of which are identical to the surfaces of the respective add-on parts 8. These embossments are as deep as the attachments are thick. As a result, the surfaces of the add-on parts align with the surfaces of the respective main parts (cover part).
  • part of the other add-on parts or all add-on parts can also be countersunk in such embossments.
  • the upper surfaces of the main and add-on parts visible in the drawing form the underside during the welding process. They are cooled during the welding process, ideally by putting on a water-cooled copper bar. This results in very smooth seam surfaces on the visible top of the main and add-on parts, which are even optically inconspicuous.

Abstract

Washing machines, in particular those that can be loaded through their casing, have hinged lids on their stainless steel washing drums (1). The object of the invention is to secure the fixed attachments of such drum lids, such as hinges (11, 12), hooks (7, 8), etc. on the main body of the drum lid in a more permanent and less costly manner than in the prior art. This object is achieved in that the attachments are secured to the main part of the subassembly by laser weld seams (13, 14).

Description

Haushaltgerät mit einer mehrteiligen Baugruppe aus EdelstahlHousehold appliance with a multi-part assembly made of stainless steel
Die Erfindung geht aus von einem Haushaltgerät mit einer mehrteiligen Baugruppe aus schweißstabilisiertem Edelstahl, insbesondere mantelseitig beschickbare Waschmaschine mit einer Edelstahl-Wäschetrommel, deren Trommeldeckel unlösbar befestigte Anbauteile, wie Scharniere, Haken etc. aufweist.The invention relates to a household appliance with a multi-part assembly made of sweat-stabilized stainless steel, in particular a washing machine with a stainless steel washing drum that can be loaded on the jacket side, the drum lid of which has attached parts, such as hinges, hooks, etc., which are permanently attached.
Ein derartiges Haushaltgerät ist aus der DE 22 37 410 C3 bekannt, wobei darin allerdings kein schweißstabilisierter Edelstahl verwendet werden mußte. Die Trommeldeckel dieser mantelseitig beschickbaren Waschmaschine bestehen aber aus Edelstahl und enthalten Anbauteile, wie Scharniere, Haken etc. Diese Anbauteile sind durch Hohlnietung am Hauptteil, nämlich dem Trommeldeckei, unlösbar befestigt. Derartige Konstruktionen von Baugruppen sind fertigungstechnisch zu aufwendig. Zum einen erfordern das Hauptteil und die Anbauteile maßhaltige und kongruente Lochbilder; sie müssen zum Befestigen in eine deckungsgleiche Position gebracht werden und erfordern das Anbringen von mehreren einzelnen Nieten, die zumeist als Rohrniete ausgebildet sind. Dann erfordert der unmittelbare Befestigungsvorgang auch einen hohen Kraft- einsatz zum Setzen der Niete.Such a household appliance is known from DE 22 37 410 C3, although no sweat-stabilized stainless steel had to be used therein. The drum lid of this washing machine, which can be loaded on the jacket side, is made of stainless steel and contains attachments such as hinges, hooks, etc. These attachments are permanently attached to the main part, namely the drum cover, by riveting. Such constructions of assemblies are too complex to manufacture. On the one hand, the main part and the attachments require dimensionally accurate and congruent hole patterns; they have to be brought into a congruent position for fastening and require the attachment of several individual rivets, which are usually designed as tubular rivets. Then the immediate fastening process also requires a lot of force to set the rivet.
Zur Vermeidung eines solchen hohen Fertigungsaufwandes hat man bereits die Verbindung von Anbauteilen am Hauptteil solcher Baugruppen durch Punkt-Schmelzschweißen realisiert. Dies erfordert jedoch den Einsatz von nichtferritischen schweißbaren Edelstahlen, die sich unter besonderen Bedingungen Punktschweißen lassen, ohne daß es innerhalb der Schweißpunkte zu interkristallinen Korrosionen kommt, die bei Dauerbelastung mit Wasser - wie es bei Waschmaschinen gegeben ist - den Ansatz von zellenartigem Rostfraß bedeutet, der sich schließlich auf alle übrigen Teile der Baugruppe und gegebenenfalls weiterer Edelstahlteile im Haushaltgerät ausbreiten kann.To avoid such a high manufacturing effort, the connection of attachments to the main part of such assemblies has already been realized by spot fusion welding. However, this requires the use of non-ferritic weldable stainless steels, which can be spot-welded under special conditions, without intercrystalline corrosion occurring within the weld spots, which means, with continuous exposure to water - as is the case with washing machines - the start of cell-like rusting, which can finally spread to all other parts of the assembly and possibly other stainless steel parts in the household appliance.
Der Erfindung liegt die Aufgabe zugrunde, bei einem eingangs erwähnten Haushaltgerät aufwen- dige Verbindungen, wie Nietverbindungen zu vermeiden, ohne dafür höherwertige Werkstoffe einsetzen zu müssen oder im Langzeitbetrieb die Gefahr von Rostfraß hinzunehmen.The object of the invention is to avoid complex connections, such as riveted connections, in a household appliance mentioned at the outset, without having to use higher-quality materials or accepting the risk of rusting in long-term operation.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Anbauteile am Hauptteil der Baugruppe durch Laserschweißnähte befestigt sind. Neuere Erkenntnisse in der Schweißtechnologie des Laserschweißens lassen örtlich begrenzte Schweißungen an verhältnismäßig dicken Blechteilen sogar mit mehreren Schichten zu. Bei Haushaltgeräten angewendet, ergeben solche Schweißverbindungen sehr saubere und haltbare Verbindungen, die interkristalline Korrosionen auch an nicht besonders hochwertigen Edelstäh- len vermeiden.According to the invention, this object is achieved in that the attachments are fastened to the main part of the assembly by laser welds. Recent findings in the welding technology of laser welding allow localized welding on relatively thick sheet metal parts even with multiple layers. When used in household appliances, such welded joints result in very clean and durable joints that prevent intergranular corrosion even on stainless steel that is not of particularly high quality.
In besonders vorteilhafter Weise kann die Erfindung dadurch weiter ausgestaltet werden, daß die Laserschweißnähte steppnahtartig unterbrochen sind. Solche Unterbrechungen haben sich als besonders vorteilhaft dafür erwiesen, daß die Schweißnähte dadurch weniger korrosionsanfällig sind. Man hat herausgefunden, daß durch die steppnahtartige Unterbrechung der Schweiß- nähte die einzelnen Schweißnahtabschnitte untereinander elektrische Potentiale bilden, die sich gegenseitig neutralisieren und dadurch einer Korrosion entgegenwirken. Am deutlichsten tritt dieser Effekt ein, wenn die Laserschweißnähte paarweise gesetzt sind. Auch sind die geringsten Schwierigkeiten hinsichtlich der Korrosionsbildung dann zu erwarten, wenn das Hauptteil und die Anbauteile aus einer einheitlichen Edelstahllegierung bestehen. Dadurch ist am ehesten gewähr- leistet, daß beim Laserschweißen die Werkstoffe der Anbauteile und des Hauptteils homogen verschmelzen.In a particularly advantageous manner, the invention can be further developed in that the laser weld seams are interrupted like a quilting seam. Such interruptions have proven to be particularly advantageous in that the welds are less susceptible to corrosion. It has been found that due to the stitch-like interruption of the weld seams, the individual weld seam sections form electrical potentials with one another which neutralize one another and thereby counteract corrosion. This effect is most evident when the laser welds are set in pairs. The least difficulties with regard to the formation of corrosion are also to be expected if the main part and the add-on parts consist of a uniform stainless steel alloy. This is the best way to ensure that the materials of the add-on parts and the main part merge homogeneously during laser welding.
Für die Fertigung der zu schweißenden Baugruppe ist es von besonderem Vorteil, wenn die Erfindung durch Prägungen weitergebildet wird, die am Hauptteil und/oder an den Anbauteilen mit Gegenprägungen oder -ausnehmungen am jeweiligen zu verbindenden Teil lagerichtig korres- pondieren. Dann ist nämlich die Ausrichtung und Fixierung der Teile zueinander am leichtesten zu bewerkstelligen.For the production of the assembly to be welded, it is particularly advantageous if the invention is developed further by means of embossments which correspond in the correct position on the main part and / or on the add-on parts with counter-embossments or recesses on the respective part to be connected. This is the easiest way to align and fix the parts to each other.
Für eine optisch glattere Ausbildung der Oberflächen an den Baugruppen und für die Verminderung der Gefahr, durch das Angreifen an solchen Flächen mit der Hand Verletzungen davonzutragen, ist die Ausgestaltung der Erfindung dadurch verbesserungsfähig, daß das Hauptteii an den Orten der Anbauteile Prägungen aufweist, deren Flächen mit den zu verbindenden Flächen der Anbauteile deckungsgleich sind und die so tief sind, wie das Dickenmaß der Anbauteile. Dadurch können die Anbauteile so versenkt verbunden sein, daß ihre Oberflächen bündig mit der Oberfläche des Hauptteils liegen.For an optically smoother design of the surfaces on the assemblies and for the reduction of the risk of being injured by gripping such surfaces by hand, the embodiment of the invention can be improved in that the main part has embossments at the locations of the attachments, the surfaces of which are congruent with the surfaces of the attachments to be connected and which are as deep as the thickness of the attachments. As a result, the attachments can be connected so that they are flush so that their surfaces are flush with the surface of the main part.
Ein besonders vorteilhaftes Verfahren zum Verbinden von Anbauteilen mit einem Hauptteil einer mehrteiligen Baugruppe aus schweißstabiiisiertem Edelstahl eines Haushaltgerätes, insbesondere einer mantelbeschickbaren Waschmaschine mit einer Edelstahl-Wäschetrommel, deren Trommeldeckel unlösbar befestigte Anbauteile, wie Scharniere, Haken etc. aufweist, ist dadurch gekennzeichnet, daß die Anbauteile in ihrer Verbindungsposition am Hauptteil vorübergehend mechanisch fixiert und dann durch Einwirken eines Laserstrahls an räumlich eng begrenzten Orten unlösbar mit dem Werkstoff des Hauptteils verschmolzen werden. Das erfindungsgemäße Verfahren kann in besonders vorteilhafter Weise dadurch weitergebildet sein, daß der Laserstrahl während des Schweißvorganges entlang der Nahtlinie geführt und zeitweilig unterbrochen wird. Dadurch ergeben sich steppnahtartige Schweißnähte von selbst.A particularly advantageous method for connecting attachments to a main part of a multi-part assembly made of weld-stabilized stainless steel of a household appliance, in particular a washing machine with a stainless steel laundry drum, whose drum cover has attached attachments, such as hinges, hooks, etc., which are permanently attached, is characterized in that Add-on parts are temporarily mechanically fixed in their connecting position on the main part and are then inseparably fused to the material of the main part by the action of a laser beam at spatially limited locations. The method according to the invention can be developed in a particularly advantageous manner in that the laser beam is guided along the seam line during the welding process and temporarily interrupted. This results in quilt-like welds of their own accord.
Während des Schweißvorgangs wird als Arbeitsgas in besonders vorteilhafter Weise ein inertes Schutzgas zugeführt. Ein solches Schutzgas kann Argon oder Helium sein. Es verhindert dasDuring the welding process, an inert protective gas is supplied in a particularly advantageous manner as the working gas. Such an inert gas can be argon or helium. It prevents that
Anlaufen der Schweißnaht.Start of the weld.
Wenn während des Schweißvorganges die Nahtunterseite gekühlt wird, kann am ehesten eine saubere Nahtfläche erwartet werden. Die Naht ist dann an der gekühlten Oberfläche kaum noch zu erkennen. Als besonders vorteilhaft hat sich die Kühlung durch Anlegen einer wassergekühl- ten Kupferschiene erwiesen. Hierdurch ist die Kühlung so feinfühlig steuerbar, daß die Nahtoberfläche optimal konditioniert wird.If the underside of the seam is cooled during the welding process, a clean seam surface can most likely be expected. The seam can then hardly be recognized on the cooled surface. Cooling by applying a water-cooled copper bar has proven to be particularly advantageous. As a result, the cooling can be controlled so sensitively that the seam surface is optimally conditioned.
Insgesamt ergeben sich durch einzelne Merkmale der vorstehend beschriebenen Erfindungsmerkmale folgende Vorteile:Overall, the following advantages result from individual features of the inventive features described above:
Durch die geringere Wärmeeinwirkung beim Schweißen mittels Laserstrahlen als beim Wider- Standsschweißen laufen die Schweißnahtoberflächen nicht farbig an. Daher entsteht keine äußere Korrosion. Neben der Vermeidung von Korrosionsschäden entsteht eine nach der erfindungsgemäßen Methode hergestellte Baugruppe, die weniger technisch anmutet als Baugruppen gemäß dem Stand der Technik, die durch Nietverbindungen zusammengesetzt sind. Die erfindungsgemäße Laserschweißtechnik erfordert geringere Materialkosten, weil trotz der Ver- wendung von höherwertigem Edelstahl (schweißstabilisiert) eine Vielzahl von zusätzlichen Verbindungsmitteln wegfällt. Da zusätzliche Verbindungsmittel außerdem einen hohen Einsatz an Handarbeit erfordern, können durch Anwendung der erfindungsgemäßen Laserschweißtechnik die Fertigungskosten für derartige Baugruppen minimiert werden. Weiterhin werden nach der Erfindung hergestellte Baugruppen stabiler in ihren Verbindungen; weil sich erwiesen hat, daß stärkere Auswölbungen von erfindungsgemäß geschweißten Blechteilen an Deckeln von mantel- beschickbaren Waschmaschinen beim Schleudern ausbleiben. Derartige Effekte haben beim Verbinden durch zusätzliche Verbindungsmittel, z.B. Hohlniete, häufig zum Berühren der Heizung im Laugenbehälter durch Teile des Trommelmantels, insbesondere der Trommeldeckel, geführt. Schließlich kann durch Anwendung der erfindungsgemäßen Laserschweißtechnik eine Reinheit im verwendeten Werkstoff für derartige Baugruppen erzielt werden, die mit anderen Verbindungstechniken nicht möglich ist, weil zusätzliche Verbindungsmittel andere Werkstoffe einbringen. Dieser Aspekt ist wichtig für die Trennung der Materialien bei der Entsorgung von Produkten, die mit solchen Baugruppen ausgestattet sind. Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels ist die Erfindung nachstehend erläutert.Due to the lower heat exposure when welding with laser beams than with resistance welding, the weld seam surfaces do not tarnish. Therefore there is no external corrosion. In addition to the avoidance of corrosion damage, an assembly is produced using the method according to the invention that appears less technical than assemblies according to the prior art, which are composed by riveted connections. The laser welding technology according to the invention requires lower material costs because, despite the use of higher quality stainless steel (weld stabilized), a large number of additional connecting means are eliminated. Since additional connecting means also require a great deal of manual work, the production costs for such assemblies can be minimized by using the laser welding technology according to the invention. Furthermore, assemblies produced according to the invention become more stable in their connections; because it has been shown that there are no pronounced bulges of sheet metal parts welded according to the invention on the covers of washing machine that can be charged with the jacket during the spin cycle. Such effects have often resulted in contact by means of additional connecting means, for example hollow rivets, for touching the heating in the tub through parts of the drum shell, in particular the drum cover. Finally, by using the laser welding technology according to the invention, a purity in the material used for such assemblies can be achieved, which is not possible with other connection technologies because additional connection means introduce other materials. This aspect is important for the separation of materials when disposing of products that are equipped with such assemblies. The invention is explained below using an exemplary embodiment shown in the drawing.
In der Zeichnung ist eine Partie eines Mantelbereiches 2 von einer mantelseitigen beschickbaren Wäschetrommel 1 dargestellt, in der ein den Zugang zum Innenraum der Wäschetrommel er- möglichender Deckel eingebaut und schamiert sind. Der Deckel ist zweiteilig, hat einen sogenannten Unterdeckel 3 mit in der Nähe seines freien Endes angebrachten Haken 4 und einen sogenannten Oberdeckel 5 mit in der Nähe der freien Kante 6 angebrachten Ösen 7. Da die Deckelteile 3 und 5 schmaler sind als die Zugangsöffnung in der Wäschetrommel 1 , haben die Ränder 18 und 19 von den aufgesteckten Randleisten 20 an der Zugangsöffnung einen Abstand. Die Deckelteile können daher durch die Zugangsöffnung durchtauchen.The drawing shows a section of a jacket area 2 of a laundry drum 1 that can be loaded on the jacket side, in which a cover that allows access to the interior of the laundry drum is installed and sheared. The lid is in two parts, has a so-called lower lid 3 with hooks 4 attached near its free end and a so-called upper lid 5 with eyelets 7 attached near the free edge 6. Since the lid parts 3 and 5 are narrower than the access opening in FIG Laundry drum 1, the edges 18 and 19 are at a distance from the attached edge strips 20 at the access opening. The cover parts can therefore pass through the access opening.
Haken 4 und Ösen 7 greifen im geschlossenen Zustand des Deckels 3, 5 ineinander und wirken Öffnungskräften erfolgreich entgegen. Solche Öffnungskräfte werden einerseits durch Federn 9 erzielt, die in den Scharnieren 10 der beiden Deckelteile 3 und 5 eingebaut sind, mit denen die Deckelteile schwenkbeweglich an den parallel zur Trommelachse liegenden Rändern der Zu- gangsöffnung für die Wäschetrommel befestigt sind. Andererseits werden solche Deckel-Öffnungskräfte von in der Trommel liegenden Wäschestücken bewirkt, die insbesondere beim Schleudern einer Zentrifugalkraft ausgesetzt sind. Außerdem sind an den Oberseiten der Dek- kelteile 3 und 5 noch Fanghaken angebracht, die sich an nicht dargestellten Rändern eines Einfüllschachtes festsetzen, wenn die Wäschetrommel sich bei offenen Deckelteilen 3 und 5 drehen sollte.Hooks 4 and eyes 7 engage in the closed state of the lid 3, 5 and successfully counteract opening forces. Such opening forces are achieved, on the one hand, by springs 9, which are built into the hinges 10 of the two cover parts 3 and 5, with which the cover parts are pivotally attached to the edges of the access opening for the laundry drum lying parallel to the drum axis. On the other hand, such lid opening forces are caused by items of laundry lying in the drum, which are exposed to a centrifugal force in particular when spinning. In addition, catch hooks are attached to the upper sides of the cover parts 3 and 5, which catch on the edges of a filling shaft, not shown, when the laundry drum should rotate when the cover parts 3 and 5 are open.
Für die Anbauteile (Haken 4 und Fanghaken 8) und die beweglichen Teile 11 der Scharniere 10 sind die Deckelteile der jeweilige Hauptteil; alle zusammen bilden die Baugruppe 3 bis 8 und 11. Der Mantelteil 2 der Wäschetrommel 1 bildet seinerseits ein weiteres Hauptteil, an das als Anbauteile die festen Teile 12 der Scharniere 10 versehen sind. Schließlich bildet das Mantelteil 2 der Wäschetrommel 1 zusammen mit den schamierten Deckelteilen 3 und 5 die übergeordneteFor the add-on parts (hook 4 and catch hook 8) and the movable parts 11 of the hinges 10, the cover parts are the respective main parts; all together form the assemblies 3 to 8 and 11. The jacket part 2 of the laundry drum 1 in turn forms a further main part, to which the fixed parts 12 of the hinges 10 are provided as add-on parts. Finally, the jacket part 2 of the laundry drum 1 together with the lined cover parts 3 and 5 forms the parent
Baugruppe.Assembly.
Sowohl die Scharnierteile 11 und 12 wie die übrigen Anbauteile (Haken 7 und 8) sind durch Schweißverbindungen, die durch kurze Linien 13, 14 angedeutet sind, mit den jeweiligen Hauptteilen (Trommelmantelteil 2, Deckelteile 3, 5) verbunden. Die angedeuteten Schweißnahtab- schnitte 13 einerseits und 14 andererseits liegen miteinander in einer Flucht; die jeweiligenBoth the hinge parts 11 and 12 as well as the other add-on parts (hooks 7 and 8) are connected to the respective main parts (drum shell part 2, cover parts 3, 5) by welded connections, which are indicated by short lines 13, 14. The indicated weld seam sections 13 on the one hand and 14 on the other are in alignment with one another; the respective
Schweißnahtabschnitte 13 liegen anderersseits zu den benachbarten Schweißnahtabschnitten 14 parallel. Jeweils parallel liegende Schweißnahtabschnitte bilden ein Potentialpaar von jeweils zwischen 15 und 20 mm Länge und erlauben bei Beaufschlagung mit einem Elektrolyten (z.B. einer Waschlauge) einen Potentialausgleich. Diese Anordnung vermeidet vorteilhafterweise Korrosionsbildung im Schweißnahtbereich. An der Fußplatte 15 der Haken 4 sind nach unten weisende Prägungen 16 sichtbar, die in entsprechende, nicht sichtbare Ausnehmungen am Deckelteil 3 passen. Dadurch lassen sich die Haken 4 vor dem Verschweißen lagerichtig vorfixieren, ohne durch äußere Maßnahmen besonders positioniert werden zu müssen. An den Orten der Fanghaken 8, die am Deckelteil 3 bzw. am Deckelteil 5 verbunden sind, weisen die Deckelteile Prägungen 17 auf, deren Flächen dek- kungsgleich mit den Flächen der jeweiligen Anbauteile 8 sind. Diese Prägungen sind so tief, wie die Anbauteile dick sind. Dadurch bilden die Oberflächen der Anbauteile eine Flucht mit den Flächen der jeweiligen Hauptteile (Deckelteil). Zusätzlich zu den hier in Prägungen 17 versenkten Fanghaken 8 können auch ein Teil der anderen Anbauteile oder alle Anbauteile in solchen Prä- gungen versenkt sein.On the other hand, weld seam sections 13 are parallel to the adjacent weld seam sections 14. Welding seam sections lying in parallel each form a potential pair, each between 15 and 20 mm in length, and allow equipotential bonding when applied with an electrolyte (eg a wash liquor). This arrangement advantageously avoids the formation of corrosion in the weld area. On the base plate 15 of the hooks 4, downward-facing embossments 16 are visible, which fit into corresponding, invisible recesses on the cover part 3. As a result, the hooks 4 can be pre-fixed in the correct position before welding, without having to be specially positioned by external measures. At the locations of the catch hooks 8, which are connected to the cover part 3 or to the cover part 5, the cover parts have embossings 17, the surfaces of which are identical to the surfaces of the respective add-on parts 8. These embossments are as deep as the attachments are thick. As a result, the surfaces of the add-on parts align with the surfaces of the respective main parts (cover part). In addition to the catch hooks 8 sunk here in embossings 17, part of the other add-on parts or all add-on parts can also be countersunk in such embossments.
Die in der Zeichnung sichtbaren oberen Flächen der Haupt- und Anbauteile bilden während des Schweißvorganges die Unterseite. Sie werden während des Schweißvorganges gekühlt, und zwar am besten durch Anlegen einer wassergekühlten Kupferschiene. Dadurch erzielt man auf der sichtbaren Oberseite der Haupt- und Anbauteile sehr glatte Nahtoberflächen, die sogar op- tisch unauffällig sind. The upper surfaces of the main and add-on parts visible in the drawing form the underside during the welding process. They are cooled during the welding process, ideally by putting on a water-cooled copper bar. This results in very smooth seam surfaces on the visible top of the main and add-on parts, which are even optically inconspicuous.

Claims

Patentansprüche claims
1. Haushaltgerät mit einer mehrteiligen Baugruppe aus schweißstabilisiertem Edelstahl, insbesondere mantelseitig beschickbare Waschmaschine mit einer Edelstahl-Wäsche- trommel, deren Trommeldeckel lösbar befestigte Anbauteile, wie Scharniere, Haken etc. aufweist, dadurch gekennzeichnet, daß die Anbauteile (4, 8,10, 15) am Hauptteil (2, 3, 5) der Baugruppe durch Laserschweißnähte (13, 14) befestigt sind.1. Household appliance with a multi-part assembly made of sweat-stabilized stainless steel, in particular a washing machine with a stainless steel washing drum that can be loaded on the jacket side, the drum cover of which has detachably attached attachments, such as hinges, hooks, etc., characterized in that the attachments (4, 8, 10, 15) are attached to the main part (2, 3, 5) of the assembly by laser weld seams (13, 14).
2. Haushaitgerät nach Anspruch 1 , dadurch gekennzeichnet, daß die Laserschweiß- nähte (13, 14) steppnahtartig unterbrochen sind.2. Household appliance according to claim 1, characterized in that the laser welding seams (13, 14) are interrupted like a quilting seam.
3. Haushaltgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß Laserschweißnähte ( 13, 14) paarweise gesetzt sind.3. Household appliance according to claim 1 or 2, characterized in that laser welds (13, 14) are set in pairs.
4. Haushaltgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das4. Household appliance according to one of claims 1 to 4, characterized in that the
Hauptteil (2, 3, 5) und die Anbauteile (4, 8, 10, 15) aus einer einheitlichen Edelstahllegierung bestehen.The main part (2, 3, 5) and the add-on parts (4, 8, 10, 15) consist of a uniform stainless steel alloy.
5. Haushaltgerät nach Anspruch 4, dadurch gekennzeichnet, daß das Hauptteil (2, 3, 5) und/oder die Anbauteile (4, 8, 10, 15) Prägungen (16) aufweisen, die mit Gegenprägungen oder -ausnehmungen am jeweiligen zu verbindenden Teil lagerichtig korrespondieren.5. Household appliance according to claim 4, characterized in that the main part (2, 3, 5) and / or the add-on parts (4, 8, 10, 15) have embossments (16) which are to be connected to counter-embossments or recesses on the respective Part correspond in the correct position.
6. Haushaltgerät nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß das Haupt- teil (3, 5) an den Orten der Anbauteile (8) Prägungen (17) aufweist, deren Kontaktflächen mit den zu verbindenden Kontaktflächen der Anbauteile (8) deckungsgleich sind und die so tief sind, wie das Dickenmaß der Anbauteile (8). 6. Household appliance according to claim 4 or 5, characterized in that the main part (3, 5) at the locations of the attachments (8) has embossments (17), the contact surfaces of which are congruent with the contact surfaces of the attachments (8) to be connected and which are as deep as the thickness of the attachments (8).
. Verfahren zum Verbinden von Anbauteilen mit einem Hauptteil einer mehrteiligen Baugruppe aus schweißstabilisiertem Edelstahl eines Haushaltgerätes nach einem der Ansprüche 1 bis 6, insbesondere einer mantelseitig beschickbaren Waschmaschine mit einer Edelstahl-Wäschetrommel, deren Trommeldeckel unlösbar befestigte Anbauteile, wie Scharniere, Haken etc. aufweist, dadurch gekennzeichnet, daß die Anbauteile (4,. A method for connecting attachments to a main part of a multi-part assembly made of sweat-stabilized stainless steel of a household appliance according to one of claims 1 to 6, in particular a washing machine that can be loaded on the jacket side with a stainless steel laundry drum, the drum lid of which has attachments, such as hinges, hooks, etc., permanently attached characterized in that the attachments (4,
8, 10, 15) in ihrer Verbindungsposition am Hauptteil (2, 3, 5) vorübergehend mechanisch fixiert und dann durch Einwirken eines Laserstrahls an räumlich eng begrenzten Orten unlösbar mit dem Werkstoff des Hauptteils verschmolzen werden.8, 10, 15) are temporarily mechanically fixed in their connecting position on the main part (2, 3, 5) and then inseparably fused to the material of the main part by the action of a laser beam at spatially limited locations.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß der Laserstrahl während des Schweißvorganges entlang der Nahtlinie geführt und zeitweilig unterbrochen wird.8. The method according to claim 7, characterized in that the laser beam is guided and temporarily interrupted during the welding process along the seam line.
9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß während des9. The method according to claim 7 or 8, characterized in that during the
Schweißvorgangs als Arbeitsgas ein inertes Schutzgas zugeführt wird.An inert shielding gas is supplied as the working gas during the welding process.
10. Verfahren nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß während des Schweißvorganges die Nahtunterseite gekühlt wird.10. The method according to any one of claims 7 to 9, characterized in that the underside of the seam is cooled during the welding process.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Kühlung durch Anle 11. The method according to claim 10, characterized in that the cooling by Anle
PCT/EP1998/003515 1997-07-02 1998-06-10 Household appliance with a stainless steel subassembly WO1999001603A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59802745T DE59802745D1 (en) 1997-07-02 1998-06-10 HOUSEHOLD APPLIANCE WITH A MULTI-PIECE ASSEMBLY OF STAINLESS STEEL
BR9810640-6A BR9810640A (en) 1997-07-02 1998-06-10 Home appliance with a group of construction of several stainless steel parts
EP98937470A EP0993518B1 (en) 1997-07-02 1998-06-10 Household appliance with a stainless steel subassembly
AT98937470T ATE209269T1 (en) 1997-07-02 1998-06-10 HOUSEHOLD APPLIANCE WITH A MULTIPLE ASSEMBLY MADE OF STAINLESS STEEL

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19728196.6 1997-07-02
DE19728196A DE19728196A1 (en) 1997-07-02 1997-07-02 Household appliance with a multi-part assembly made of stainless steel

Publications (1)

Publication Number Publication Date
WO1999001603A1 true WO1999001603A1 (en) 1999-01-14

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PCT/EP1998/003515 WO1999001603A1 (en) 1997-07-02 1998-06-10 Household appliance with a stainless steel subassembly

Country Status (9)

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EP (1) EP0993518B1 (en)
CN (1) CN1261934A (en)
AT (1) ATE209269T1 (en)
BR (1) BR9810640A (en)
DE (2) DE19728196A1 (en)
ES (1) ES2168781T3 (en)
RU (1) RU2176696C2 (en)
TR (1) TR199903250T2 (en)
WO (1) WO1999001603A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10006975B4 (en) * 2000-02-16 2004-08-12 BSH Bosch und Siemens Hausgeräte GmbH Washing drum for a washing machine
DE102006044283A1 (en) * 2006-09-20 2008-04-03 BSH Bosch und Siemens Hausgeräte GmbH Set comprising a domestic appliance and an accessory
ITTO20070344A1 (en) * 2007-05-16 2008-11-17 Indesit Co Spa WASHING MACHINE LOADED FROM HIGH, IN PARTICULAR A WASHING MACHINE, AND ITS OPERATING METHOD

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2237410A1 (en) * 1972-07-27 1974-02-07 Siemens Elektrogeraete Gmbh TWO-PIECE DRUM COVER FOR A CLOTHED DRUM WASHING MACHINE
GB1532556A (en) * 1975-02-18 1978-11-15 Blomberg Werke Kg Drum for washing machines tumbler driers or the like rotary drum laundry apparatus
EP0234243A1 (en) * 1986-02-27 1987-09-02 Zeltron Istituto Zanussi Per L'elettronica S.P.A. Method for manufacturing a tub for a laundry washing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2237410A1 (en) * 1972-07-27 1974-02-07 Siemens Elektrogeraete Gmbh TWO-PIECE DRUM COVER FOR A CLOTHED DRUM WASHING MACHINE
GB1532556A (en) * 1975-02-18 1978-11-15 Blomberg Werke Kg Drum for washing machines tumbler driers or the like rotary drum laundry apparatus
EP0234243A1 (en) * 1986-02-27 1987-09-02 Zeltron Istituto Zanussi Per L'elettronica S.P.A. Method for manufacturing a tub for a laundry washing machine

Also Published As

Publication number Publication date
RU2176696C2 (en) 2001-12-10
DE19728196A1 (en) 1999-01-07
CN1261934A (en) 2000-08-02
EP0993518B1 (en) 2001-11-21
TR199903250T2 (en) 2000-11-21
ATE209269T1 (en) 2001-12-15
BR9810640A (en) 2000-08-01
ES2168781T3 (en) 2002-06-16
DE59802745D1 (en) 2002-02-21
EP0993518A1 (en) 2000-04-19

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