EP2241821B1 - Methode de fabrication d'une grille de cuisson soudée, grille de cuisson fabriquée avec cette méthode et appareil de cuisson comprenant une telle grille - Google Patents

Methode de fabrication d'une grille de cuisson soudée, grille de cuisson fabriquée avec cette méthode et appareil de cuisson comprenant une telle grille Download PDF

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Publication number
EP2241821B1
EP2241821B1 EP10158838.2A EP10158838A EP2241821B1 EP 2241821 B1 EP2241821 B1 EP 2241821B1 EP 10158838 A EP10158838 A EP 10158838A EP 2241821 B1 EP2241821 B1 EP 2241821B1
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EP
European Patent Office
Prior art keywords
arm
grate
welded
bars
arms
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP10158838.2A
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German (de)
English (en)
Other versions
EP2241821A1 (fr
Inventor
Pietro Bartoccetti
Dino Bucci
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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Publication date
Application filed by Indesit Co SpA filed Critical Indesit Co SpA
Publication of EP2241821A1 publication Critical patent/EP2241821A1/fr
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Publication of EP2241821B1 publication Critical patent/EP2241821B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/107—Pan supports or grates therefor

Definitions

  • the present invention relates to a method for manufacturing a welded grate for cooktops, a grate manufactured in accordance with said method, and a cooking household appliance comprising such a grate.
  • Cooktop grates which are used as support bases for pans, comprise a frame, typically having a rectangular or square shape, from which one or more arms extend inwards in both the longitudinal and transversal directions, thus forming the pan support regions: the arms may terminate at a certain distance from each another, thereby leaving a central area empty, or else they may intersect.
  • Such grates are generally manufactured in two ways: by casting or by welding.
  • the former are typically made of cast iron and are installed on high-quality cooktops, since they are stronger and more expensive: these grates are typically manufactured as a monolithic cast iron piece which is cast into a mould having the desired shape.
  • flat-wire grates are typically made of a weldable metal material, such as steel or the like, and are installed on low-end cooktops because they imply lower production costs, since they are made out of metal bars welded together to form a grate.
  • the present invention specifically refers to the field of welded grates; for example, document WO2008/068585 comprises an embodiment regarding a welded grate.
  • the two bars will undergo different thermal expansion (due to the fact that they are placed at a different height above a heat source), which may cause the grate to warp or the above-mentioned cavities to grow larger.
  • the bars extend from one side to the other side of the frame, and in an intermediate position between the opposite bar ends a notch is made by chip removal machining, e.g. by milling; the bars are then overlapped and thus remain at the same height, thereby providing a level support for pans.
  • the chip removal operation for creating the notch is typically quite costly, and in this solution it has to be carried out on both bars in order to be able to arrange them at the same height relative to the frame.
  • welded grates are sometimes subjected to an enamelling process: in such a case, the cavities near the bar intersection point are so large that they cannot be coated or filled by the enamel, which instead penetrates into them, with the consequence that such cavities remain visible even on enamelled grates, resulting in the same problems already described (poor finishing and potential dirt accumulation).
  • the present invention aims at providing a method for manufacturing a welded grate for cooktops, as well as a grate manufactured in accordance with said method, which can overcome such drawbacks.
  • the object of the present invention consists of a method for manufacturing a welded grate for cooktops according to claim 1 appended hereto and a welded grate for cooktops according to claim 10.
  • the present invention is based upon the idea of providing a method for manufacturing a welded grate for cooktops, of the type comprising a frame from which at least two bars extend, thus forming a first and a second concurrent arms having a common intersection area, wherein the arms are arranged at the same height relative to the frame, and wherein one end portion of the first arm is welded to the second arm in the intersection area.
  • a grate manufactured in accordance with said method and a cooking household appliance, in particular a gas cooktop or a gas cooker, comprising such a grate.
  • Fig. 1 shows a grate 1 according to the present invention: it comprises a frame 2 from which longitudinal arms 3, 3' and transversal arms 5, 6, 5', 6', 5", 6" extend perpendicularly to one another.
  • the longitudinal arms 3, 3' are coupled to the transversal arms 5, 6 and 5', 6', respectively, thus defining two intersection areas 10 and 10', whereas in the central portion of the grate 1 the two transversal arms 5" and 6" are connected neither to each other nor to any longitudinal arm, thus defining a supportless area 4.
  • the underlying gas burners may be located in the intersection area and/or in the supportless area.
  • the frame 2 and the arms 3,3',5,5',5",6,6',6" are made from a bar of weldable metal material, such as iron, steel, stainless steel or the like, having a solid cross-section and any shape, e.g. square A, round B, rectangular C, rectangular with bevelled edges D, as shown in Fig. 2 , although more in general shapes other than those shown in Fig. 2 may also be used, e.g. polygonal or oval or elliptic.
  • the bars employed have cross-sections with one dimension greater than the other, e.g. rectangular with or without bevelled edges, like the cross-sections C and D shown in Fig. 2 , and are arranged in a manner such that the prevailing dimension is horizontal, i.e. parallel to the plane that contains the frame 2.
  • the frame 2 is manufactured by bending and welding a single bar or by welding together multiple bars to obtain the closed shape illustrated herein.
  • the longitudinal arm 3 consists of a bar bent in the manner of an "L" and coupled at its end 3B to the frame 2, while the other end 3A extends parallel to the plane that contains the frame 2 and is placed at the same height as the arm 6 relative to the frame 2, so that pans can be laid flat thereon.
  • transversal arms are manufactured in the same way as the arm 3 described above.
  • intersection area 10 in which the transversal arms 5 and 6 are coupled to the longitudinal arm 3, since the intersection area 10' and more in general any intersection areas possibly provided will be constructed in the same manner.
  • the longitudinal arm 3 has two concave, substantially V-shaped, coupling profiles 35 and 36 formed on its body, with which the two end portions of both transversal arms 5 and 6 are matched at the same height, the latter having each a convex coupling profile 51 and 61 complementary to the shape of the concave coupling profiles 35 and 36, thus creating the intersection point 10.
  • the welding may be autogenous (welding in the strict sense of the word) or heterogeneous (brazing or braze welding): autogenous welding may be of the electrode, submerged-arc or resistance type, as will be described more in detail further on with reference to Figs. 5 to 8 ; heterogeneous welding may consist of a brazing or braze welding process: brazing is preferably a strong brazing using alloys having a high content of silver, brass or the like as a weld material, whereas braze welding uses brass or bronze or the like as a weld material, which melt at a higher temperature than the weld materials used in strong brazing.
  • concave coupling profiles 35 and 36 and the convex coupling profiles 51 and 61 may be created in different ways, e.g. by mechanical chip removal machining; it is however preferable to create such profiles through a simple shearing operation.
  • Shearing offers the advantage that it is an extremely economical process and, unlike chip removal machining (e.g. milling), which is notoriously more costly and complex, it does not affect too much the cost of the grate.
  • chip removal machining e.g. milling
  • edges of the coupling profiles 35,36,51,61 are so conceived as to include a portion inclined by about 45° relative to the corresponding bar on which they are made.
  • edge end of the bars 5 and 6 that abuts on the weld area includes a section which is parallel to the bar 3 to which said bars will be welded, said edge end being joined to the body of the respective bar 5 and 6 by two sections inclined by 45°, obtained by shearing.
  • the coupling profiles 35 and 36 have complementary shapes so conceived that the central area of the bar 3 on which they are obtained has a width of approx. 4 mm., thus avoiding to weaken the grate.
  • the coupling profiles 51 and 61 are provided each with a projection 52 and 62 in one piece with the bar that forms the arm 5 or 6, which projection is created during the shearing step for generating the coupling profile 51 and 61 by suitably shaping the bar itself and is intended for supplying at least some of the material used for the weld bead.
  • Fig. 6 there is shown that the arm 5 is approached to the arm 3 until the projection 52 comes in contact with the latter; a force in the approach direction and an electric potential difference are then applied to both arms 3 and 5 which, by Joule effect, cause the projection 52 and some of the surrounding material of the arms 3 and 5 to melt, thus welding them together in the prearranged position of the two arms 3 and 5.
  • a grate 1 as the one described above, which has no cavities in the intersection area 10, 10', or anyway only has cavities so small that they will not give rise to any of those problems suffered by the prior art; this is mainly due to two factors: firstly, the fact that at least one of the arms concurrent to the intersection point is butt welded (i.e. welded at one end) allows to reduce the machining tolerances normally expected for the notch along the bars of the welded grates according to the prior art; secondly, the force applied when approaching the two arms during the welding operation reduces even further any cavities which may form.
  • the dimensions of any cavities which may form are such that the paint or enamel layer will obstruct them completely, thereby eliminating the problem of dirt accumulating therein.
  • a further advantage of the grate 1 thus manufactured is that in the intersection area all concurrent arms 3, 5 and 6 lie in the same plane and therefore, when the grate 1 is installed on the cooktop in a manner such that the intersection area is located over one of the cooktop burners, all concurrent arms 3, 5 and 6 are placed at the same height relative to the fire, hence undergoing the same thermal expansion and leading to the advantage of preventing any deformation of the arms 3, 5 and 6, which may jeopardize the complanation of the pan support points or cause the grate to warp.
  • Figs. 9 and 10 there is shown a variant of the grate according to the present invention: in this solution, the intersection point is obtained by welding together four arms 50, 50', 60, 60', all consisting of weldable metal bars just like the arms 3, 5 and 6 previously described.
  • each concurrent arm has a respective convex coupling profile 510, 510', 610, 610', so that, when the arms are welded together, an intersection area is created similarly to the previous solution.
  • a projection-type resistance welding process may be used with the same advantages previously discussed: to this end, there may be a projection on each arm or, alternatively as shown in Fig. 10 , two arms 50, 50' may have each two projections 520, 620 and 520', 620' to be welded to two matching arms 60 and 60' lacking such projections.
  • the projections 52,62,520,620,520' and 620' will not be made of the same material as the bars, but of weld material, which melts at a lower temperature than the bar material.
  • transversal arms 5 and 6 and one longitudinal arm 3 are afferent to the intersection area 10
  • only one arm (5 or 6) is afferent thereto, even at angles other than those shown herein, e.g. in order to create grates having different shapes or intersection areas wherein the arms are not perpendicular or parallel to one another.
  • intersection points may be created by coupling one arm to another single arm, so as to create intersection points from which two or three arms extend, or, alternatively, more than three arms may be used, e.g. five, six or more arms coupled to one another.
  • the arms afferent to the intersection area extend in different directions neither perpendicular nor parallel to one another, so as to create grates wherein the intersection areas have any symmetry or shape.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Joining Of Corner Units Of Frames Or Wings (AREA)
  • Baking, Grill, Roasting (AREA)

Claims (14)

  1. Procédé de fabrication d'une grille soudée (1) destinée à des tables de cuisson, dans lequel la grille compote au moins un cadre (2) à partir duquel au moins une première branche (5, 6, 5', 6' ; 50, 50') et une seconde branche (3, 3' ; 60, 60') s'étendent de façon essentiellement perpendiculaire l'une à l'autre, lesdites première (5, 6, 5', 6' ; 50, 50') et seconde branches (3, 3' ; 60, 60') ayant une zone d'intersection en commun (10, 10'),
    caractérisé en ce que
    le procédé comporte les étapes comprenant le fait de :
    - disposer lesdites première (5, 6, 5', 6' ; 50, 50') et seconde branches (3, 3' ; 60, 60') à la même hauteur par rapport au cadre (2) ;
    - souder une partie d'extrémité de la première branche (5, 6, 5', 6' ; 50, 50') à la seconde branche (3, 3' ; 60, 60') dans la zone d'intersection (10, 10'),
    dans lequel les barres formant les branches (3, 5, 6, 3', 5', 6', 3", 5" , 50, 50', 60, 60')présentent une section transversale s'étendant en présentant une dimension plus grande que l'autre, et sont disposées d'une manière telle que la plus grande dimension est parallèle au plan qui contient le cadre (2).
  2. Procédé selon la revendication 1, dans lequel un premier profil de couplage (51, 61, 510, 510') est réalisé préalablement sur la partie d'extrémité de la première branche (5, 6, 5', 6' ; 50, 50') et un second profil de couplage (35, 36, 610, 610') est réalisé préalablement sur le corps de la seconde branche (3, 3' ; 60, 60').
  3. Procédé selon la revendication 2, dans lequel les profils de couplage (35, 36, 51, 61, 510, 510', 610, 610') sont produits par cisaillement.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel les branches (3, 5, 6, 3', 5', 6', 3 " , 5" , 50, 50', 60, 60') sont constituées de barres de métal pouvant être soudé, et les branches (3, 5, 6, 3', 5', 6', 3 " , 5" , 50, 50', 60, 60') sont soudées dans la zone d'intersection (10, 10') au moyen d'une soudure autogène par résistance de type à bossages (52, 62, 520, 620, 520', 620').
  5. Procédé selon la revendication 4, dans lequel au moins l'un des profils de couplage (51, 61, 510, 510') comporte une partie en saillie (52, 62, 520, 620, 520', 620') formée en une pièce intégrée à la barre qui constitue la branche correspondante (5, 6, 50, 50').
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel au moins l'un des profils de couplage (51, 61, 510, 610, 510', 610') est convexe.
  7. Procédé selon l'une quelconque des revendications 2 à 6, dans lequel les premiers (51, 61) et seconds (35, 36) profils présentent des configurations complémentaires.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel chaque zone d'intersection (10, 10') est obtenue au moyen de trois barres (3, 5, 6) s'étendant à partir du cadre (2), l'une (3) desdites barres étant dotée d'au moins deux profils de couplage concaves (35, 36) coïncidant avec les parties d'extrémité des deux barres restantes (5, 6), lesquelles sont alignées l'une avec l'autre et sont dotées d'au moins des profils de couplage convexes respectifs (51, 61).
  9. Grille soudée (1) destinée à des tables de cuisson, caractérisée en ce que
    elle est fabriquée selon le procédé de l'une ou de plusieurs des revendications précédentes.
  10. Grille soudée (1) destinée à des tables de cuisson, dans laquelle la grille (1) comporte au moins un cadre (2) à partir duquel au moins une première branche (5, 6, 5', 6' ; 50, 50') et une seconde branche (3, 3' ; 60, 60') s'étendent de façon essentiellement perpendiculaire l'une à l'autre, lesdites première (5, 6, 5', 6' ; 50, 50') et seconde (3, 3' ; 60, 60') branches ayant en commun une zone d'intersection (10, 10'),
    caractérisée en ce que
    lesdites première branche (5, 6, 5', 6' ; 50, 50') et seconde branche (3, 3' ; 60, 60') sont agencées à la même hauteur par rapport au cadre (2), une partie d'extrémité de la première branche (5, 6, 5', 6' ; 50, 50') étant soudée à la seconde branche (3, 3' ; 60, 60') dans ladite zone d'intersection (10, 10'), dans laquelle les barres constituant les branches (3, 5, 6, 3', 5', 6', 3", 5", 50, 50', 60, 60') possèdent une section transversale s'étendant en présentant une dimension plus grande que l'autre, et sont disposées d'une manière telle que la plus grande dimension est parallèle au plan qui contient le cadre (2).
  11. Grille soudée (1) selon la revendication 10, caractérisée en ce qu'elle comporte un premier profil de couplage (51, 61, 510, 510') qui est réalisé au préalable sur la partie d'extrémité de la première branche (5, 6, 5', 6' ; 50, 50') et un second profil de couplage (35, 36, 610, 610') qui est réalisé préalablement sur le corps de la seconde branche (3, 3' ; 60, 60'), lesdits profils de couplage (35, 36, 51, 61, 510, 510', 610, 610') en particulier étant produits par cisaillement et présentant des configurations complémentaires.
  12. Grille soudée (1) selon la revendication 11, caractérisée en ce que l'un au moins des profils de couplage (51, 61, 510, 510') possède une partie en saillie (52, 62, 520, 620, 520', 620') formée en une pièce intégrée à la barre qui constitue la branche correspondante (5, 6, 50, 50'), en particulier lesdites branches (3, 5, 6, 3', 5', 6', 3", 5", 50, 50', 60, 60') étant fabriquées à partir de barres de métal pouvant être soudées, et qui sont soudées dans la zone d'intersection (10, 10') au moyen d'une soudure autogène par résistance de type à bossages (52, 62, 520, 620, 520', 620').
  13. Grille soudée (1) selon l'une ou plusieurs des revendications 11 et 12, caractérisée en ce que chaque zone d'intersection (10, 10') est obtenue au moyen de trois barres (3, 5, 6) s'étendant à partir du cadre (2), l'une (3) desdites barres étant pourvue d'au moins deux profils de couplage concaves (35, 36) coïncidant avec les parties d'extrémité des deux barres restantes (5, 6), lesquelles sont alignées l'une avec l'autre et sont dotées d'au moins de profils de couplage convexes respectifs (51, 61).
  14. Appareil de cuisson ménager, en particulier plaque de cuisson à gaz ou cuisinière à gaz comportant au moins un brûleur à gaz,
    caractérisé en ce que
    il comprend une grille selon l'une ou plusieurs des revendications 9 à 13.
EP10158838.2A 2009-04-16 2010-03-31 Methode de fabrication d'une grille de cuisson soudée, grille de cuisson fabriquée avec cette méthode et appareil de cuisson comprenant une telle grille Not-in-force EP2241821B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO2009A000294A IT1394337B1 (it) 2009-04-16 2009-04-16 Metodo di fabbricazione di una griglia saldata per piani cottura, griglia realizzata secondo tale metodo ed elettrodomestico di cottura comprendente tale griglia

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Publication Number Publication Date
EP2241821A1 EP2241821A1 (fr) 2010-10-20
EP2241821B1 true EP2241821B1 (fr) 2017-01-11

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EP10158838.2A Not-in-force EP2241821B1 (fr) 2009-04-16 2010-03-31 Methode de fabrication d'une grille de cuisson soudée, grille de cuisson fabriquée avec cette méthode et appareil de cuisson comprenant une telle grille

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EP (1) EP2241821B1 (fr)
IT (1) IT1394337B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2657614B1 (fr) * 2012-04-25 2016-12-07 BSH Hausgeräte GmbH Dispositif de cuisson avec support de poêle
US20160348923A1 (en) * 2015-05-29 2016-12-01 Electrolux Home Products, Inc. Grate fingers in flue path
WO2021167543A1 (fr) * 2020-02-17 2021-08-26 Mamur Teknoloji Sistemleri San. A.S. Support de casserole pour plaque de cuisson à gaz

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068585A2 (fr) * 2006-12-05 2008-06-12 Indesit Company S.P.A. Table de cuisson comprenant des éléments de support fabriqués spécialement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594215A (en) * 1947-10-01 1952-04-22 Perfection Stove Co Stove top grate
USD493065S1 (en) * 2002-10-25 2004-07-20 Maytag Corporation Wire grate for a cooking appliance
ITMO20060309A1 (it) * 2006-10-03 2008-04-04 Angelo Grandi Cucine Spa Struttura di supporto

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068585A2 (fr) * 2006-12-05 2008-06-12 Indesit Company S.P.A. Table de cuisson comprenant des éléments de support fabriqués spécialement

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ITTO20090294A1 (it) 2010-10-17
EP2241821A1 (fr) 2010-10-20
IT1394337B1 (it) 2012-06-06

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