EP0317822B1 - Grille-pain avec un dispositif de chauffage électrique - Google Patents

Grille-pain avec un dispositif de chauffage électrique Download PDF

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Publication number
EP0317822B1
EP0317822B1 EP88118611A EP88118611A EP0317822B1 EP 0317822 B1 EP0317822 B1 EP 0317822B1 EP 88118611 A EP88118611 A EP 88118611A EP 88118611 A EP88118611 A EP 88118611A EP 0317822 B1 EP0317822 B1 EP 0317822B1
Authority
EP
European Patent Office
Prior art keywords
insulating material
material carrier
center axis
heating
insulating body
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.)
Expired - Lifetime
Application number
EP88118611A
Other languages
German (de)
English (en)
Other versions
EP0317822A2 (fr
EP0317822A3 (en
Inventor
Andrea Hahnewald
Georg Möthrath
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.)
Braun GmbH
Original Assignee
Braun 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
Priority claimed from DE19873740298 external-priority patent/DE3740298C1/de
Priority claimed from DE19873740299 external-priority patent/DE3740299C1/de
Application filed by Braun GmbH filed Critical Braun GmbH
Priority to AT88118611T priority Critical patent/ATE84182T1/de
Publication of EP0317822A2 publication Critical patent/EP0317822A2/fr
Publication of EP0317822A3 publication Critical patent/EP0317822A3/de
Application granted granted Critical
Publication of EP0317822B1 publication Critical patent/EP0317822B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base

Definitions

  • the invention relates to a toaster with an electric heating device and the mounting of heating conductors on an insulating material carrier of the electric heating device.
  • the overwhelming majority of the electric heating devices for bread toasters used today have an insulating material carrier on which heating conductor sections are attached on one or both sides.
  • a one-piece, wire-shaped or ribbon-shaped heating conductor is wound onto the insulating material carrier by various methods, a large number of heating conductor sections running over the insulating material carrier being produced.
  • Such a heating device which as a so-called external heating element has heating conductor sections only on its front side, is known, for example, from DE-A1- 25 20 023.
  • a holding strip made of insulating material is fastened to the front of the heating device by means of several eyelets, which runs in the middle of the insulating material carrier from bottom to top and which presses the heating conductor sections against the insulating material carrier.
  • an electric heating device for a toaster in which heating conductor sections are attached on both sides of the insulating material carrier.
  • Such heating devices are required as a so-called central heating for those bread toasters which have more than one input slot for the toast, for example a bread slice, since in these bread toasters one side of two bread slices lying next to one another is toasted by a heating device.
  • the heating device described in DE-A1- 25 13 580 is produced in that a one-piece heating conductor is carried out from front to back through a vertical slot located at the upper end of the insulating material carrier, the half length of which protrudes on both sides of the insulating material carrier. On both lateral boundaries of the insulating material carrier, a number of transverse slots are made at the same height. If the insulating material carrier is now rotated helically around its central axis, the heating conductor is wound around it, and the heating conductor runs as shown in the figure on page 11 of the above-mentioned document. The heating conductor sections cross each other - only separated by the insulating material carrier - on its central axis. In this known heating device, holding strips run on both sides of the insulating material carrier along the central axis and thus over the crossing points.
  • the purpose of attaching holding strips is to fix the heating conductor sections along the holding strip, which expand when heated and thus move both forward in the direction of the roasted material and also bend downward due to gravity, and thereby limit their change in position.
  • the bread toasters used today usually have a slot width of approximately 130 mm, which means that an insulating material carrier of approximately the same dimension is required. Such arrangements allow a freely hanging heating conductor length of about 60 mm each.
  • the heating conductor sections in the area of the holding strip and also beyond their width of about 6 to 12 mm do not reach the operating temperature of about 900 ° C. which is usual today, they only insufficiently brown the roasted material at. This results in the disadvantageous, characteristic browning picture with a wide, significantly less browned, vertical area in the middle of a slice of bread to be roasted.
  • the uneven browning of the toast which occurs as a result of the expansion-related changes in the position of the heating conductor sections is further increased if cool air is sucked in in the lower area of the electric toaster, which, for technical reasons, is concentrated in the lower center of the toasted food in terms of flow and equipment.
  • the cooling that occurs in the bread toaster due to the outside air entering the lower part of its housing due to the chimney effect, which exits when heated via the bread inlet and outlet slots, is particularly effective in the air inlet area, that is, in the lower area of the heating device.
  • the air flow therefore further delays the heating of the roast in this area.
  • the heating device would therefore have to provide more energy for the lower, central area of the roast.
  • the heating device known from DE-A1- 25 20 023 also has significantly closer heating conductor sections in its lower region in the vertical direction than in its upper region (cf. FIG. 1). This is supposed to be in vertical Non-homogeneous cooling direction are compensated so that the heating power actually acting on the roasted material (by radiation and heat conduction) is approximately homogeneous in the vertical direction. It follows that the known bread toaster heater, including the cooling effect, has a substantially homogeneous power density in the vertical direction, while when the heating conductor is fastened with a single holding strip running on the central axis of the insulating material carrier or with staples also lying on this axis in the horizontal direction there is a clearly inhomogeneous power density.
  • An advantageous embodiment of the invention is to design the holding elements - as already known per se from DE-A1- 25 20 023 - as continuous strips (claim 2), which can be attached in pairs and symmetrically to the central axis (claim 3).
  • a particularly effective compensation is achieved if the continuous holding strips in the upper and less strongly cooled area of the insulating material carrier are closer to the central axis than in the lower and more cooled area (claim 4).
  • the holding elements can - as is also known per se from DE-A1- 25 20 023 - also be designed as individual staples which grip around the heating conductor and are pressed into the insulating material carrier (claim 5).
  • a particularly effective compensation can be achieved if the holding elements for lowering the output of the heat conductor area in question are selectively installed in areas of particularly large power peaks in order to reduce the output there (claim 6).
  • the heating device 1 consists of an insulating support 2, in which heating conductor sections 3 are only attached to its front side.
  • the heating conductor sections 3 can be applied to the insulating material carrier 2, for example, by welding a heating conductor of the appropriate length to an electrical connecting lug 7 riveted to the insulating material carrier 2, then leading across the width of the insulating material carrier 2, the heating wire after being wrapped around one of the leads the protrusions 6 formed from the insulating material carrier 2, loops around the next protrusion 6 and finally welds the heating wire to a second electrical connecting lug 7 'and cuts off the protruding part thereof.
  • the second terminal lug 7 ' can, as shown in Fig. 1, also riveted to the front of the insulating substrate 2.
  • the heating conductor sections 3 are held down by two holding strips 4 running at a distance from the center axis X of the insulating material carrier 2.
  • the holding strips 4 in turn are firmly connected to the insulating material carrier 2 by two rivets 5.
  • This attachment of the retaining strips 4 produces the deflection profile shown in FIG. 2 when the heating conductor sections 3 are heated.
  • This deflection profile leads to the heating conductor sections 3 being closer to one to be roasted in the more cooled area directly around the central axis X.
  • Bread slice 9 lie and thus compensate for the cooling effect.
  • the heating conductor sections 3 are located further away from the bread slice 9 in a less-cooled area, which is also desirable in the sense of compensation.
  • the maximum deflection of the heating conductor sections 3 is smaller when held down by two holding strips 4 which are arranged at a distance from the center axis X, which leads to an adjustment of the degree of toasting on the bread slice 9 between the areas of maximum and minimum exposure to the heat output given off by the heating conductor sections 3 .
  • a still further approximation of the heat output acting on the bread slice 9 can be achieved in that the heating conductor sections 3 in the areas of maximum heat output acting on the bread slice 9 are punctually held down by staples which are pressed into the insulating material carrier 2.
  • the heating device shown in FIG. 3 has an insulating material carrier 11 with heat conductor sections 14 and 14 'attached thereon.
  • the heat conductor sections designated by reference numeral 14 are attached to the front of the insulating material carrier 11, while the heat conductor sections designated by 14 'run on the rear side thereof. It is therefore a so-called central heating of a bread toaster, in which 11 heat is to be given off on both sides of the insulating material carrier.
  • the heating device shown can be produced, for example, by the following known method: A one-piece heat conductor dimensioned in terms of its length is guided through a notch 13 in the insulating material carrier 11 such that a piece of the same length protrudes from the insulating material carrier 11 on the front and rear sides thereof.
  • the insulating material carrier 11 is rotated about its central axis X in the direction of rotation indicated by an arrow and simultaneously moved upwards.
  • the insulating material carrier 11 therefore carries out a helical movement about its central axis X.
  • the pitch of the screw is chosen so that the heating conductor runs through slots 12 made on the side of the insulating material carrier 11.
  • the insulating material carrier 11 is particularly thermally stressed locally. Therefore, according to the invention, the heating conductor sections 14, 14, 14, 14, 14, 14, which are necessary for limiting the thermal expansion and the bending caused by gravity, are held by two retaining strips 21 made of insulating material and running at a distance from the central axis X.
  • the two retaining strips 21, which are attached to the front and rear of the insulating material carrier 11, are fastened with rivets 18 and / or with staples 19 pressed into the insulating material carrier 11.
  • the heating conductor sections 14 and 14 ' are always pressed on only on one side of the insulating material carrier 11, as a result of which the latter only experiences local thermal loads on one side. This makes charring unlikely. However, even if the insulating material carrier 11 should still burn through at such a point, no electrical short circuit can occur, since the heating conductor sections 14 and 14 'are not opposite one another at the points of particular local thermal stress.
  • the areas of local thermal stress can be defined so far apart that the risk of the insulating material carrier 11 becoming burned through decreases even further.

Landscapes

  • Electric Stoves And Ranges (AREA)

Claims (6)

  1. Grille-pain comportant au moins une ouverture d'entrée d'air située sur le côté dessous de son enceinte, au moins une fente pour l'introduction et l'enlèvement d'un produit à griller, et au moins un dispositif chauffant électrique (1) qui est agencé à l'intérieur de l'enceinte et qui est constitué par un support en matière isolante (2, 11) avec un axe médian (X), support sur unou deux côtés duquel sont agencées des portions de conducteur chauffant (3, 14, 14') appliquées contre lui par des éléments de maintien (4, 21), ledit dispositif étant refroidi par un courant d'air qui entre par l'ouverture d'entrée d'air puis passe principalement par la région de l'axe médian (X) du support en matière isolante (2) et ressort finalement par la fente, les éléments de maintien (4, 21) étant disposés à une distance telle de l'axe médian (X) qu'ils se trouvent sensiblement hors du domaine d'action du courant d'air.
  2. Grille-pain selon revendication 1, caractérisé
    par le fait que les éléments de maintien ont la forme de barrettes continues (4, 21) disposées par paires, symétriquement par rapport à l'axe médian.
  3. Grille-pain selon revendication 2, caractérisé
    par le fait que les éléments de maintien s'étendent parallèlement à l'axe médian (X) du support en matière isolante (2, 11).
  4. Grille-pain selon revendication 2, caractérisé
    par le fait que dans la région du bord du corps isolant (2, 11) tourné vers la fente, les éléments de maintien (4, 21) sont plus proches de l'axe médian dudit corps isolant qu'ils ne le sont dans la région du bord tourné vers l'ouverture d'entrée d'air.
  5. Grille-pain selon revendication 1, caractérisé
    par le fait que les éléments de maintien sont réalisés en tant qu'agrafes ou attaches individuelles qui retiennent les portions de conducteur chauffant (3, 14, 14' ) en les chevauchant et sont enfoncées dans le corps en matière isolante (2, 11).
  6. Grille-pain selon revendication 5, caractérisé
    par le fait que la répartition des agrafes sur le support en matière isolante (2, 11) est telle qu'elles se situent dans des régions ou une réduction de la puissance thermique délivrée par les portions de conducteur chauffant correspondantes (3, 14, 14' ) est particulièrement souhaitable.
EP88118611A 1987-11-27 1988-11-09 Grille-pain avec un dispositif de chauffage électrique Expired - Lifetime EP0317822B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88118611T ATE84182T1 (de) 1987-11-27 1988-11-09 Brotroester mit einer elektrischen heizvorrichtung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3740299 1987-11-27
DE19873740298 DE3740298C1 (en) 1987-11-27 1987-11-27 Electric heating device for a toaster
DE3740298 1987-11-27
DE19873740299 DE3740299C1 (en) 1987-11-27 1987-11-27 Electric heating device for a toaster

Publications (3)

Publication Number Publication Date
EP0317822A2 EP0317822A2 (fr) 1989-05-31
EP0317822A3 EP0317822A3 (en) 1989-07-26
EP0317822B1 true EP0317822B1 (fr) 1992-12-30

Family

ID=25862238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118611A Expired - Lifetime EP0317822B1 (fr) 1987-11-27 1988-11-09 Grille-pain avec un dispositif de chauffage électrique

Country Status (3)

Country Link
US (1) US4918294A (fr)
EP (1) EP0317822B1 (fr)
DE (1) DE3877155D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2318960A (en) * 1996-11-01 1998-05-06 Dualit Ltd Heating element and frame member
GB2373159B (en) * 1998-06-08 2002-10-23 Dualit Ltd Electric cooking and toasting apparatus and electric elements therefor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520023A1 (de) * 1975-05-06 1976-11-18 Licentia Gmbh Flachheizkoerper fuer brotroester

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE86950C (fr) *
US1624893A (en) * 1925-11-30 1927-04-12 John E Marsden Electric bread toaster
US2659799A (en) * 1950-09-20 1953-11-17 Mcgraw Electric Co Electric heating element
US3392663A (en) * 1965-10-22 1968-07-16 Sunbeam Corp Toaster
DE2513580C2 (de) * 1975-03-27 1983-07-28 Westfälische Kupfer- und Messingwerke AG, vorm. Caspar Noell, 5880 Lüdenscheid Heizeinheit für einen Toaster
DE2527131B2 (de) * 1975-06-18 1979-03-08 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Flachheizkörper fur elektrische Haushaltsgeräte, z.B. Toaster
DE2542944A1 (de) * 1975-09-26 1977-03-31 Westfael Kupfer & Messing Flachheizelement
DE7634006U1 (de) * 1976-10-28 1978-04-20 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Flachheizkoerper fuer einen elektrischen brotroester oder einen toaster

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520023A1 (de) * 1975-05-06 1976-11-18 Licentia Gmbh Flachheizkoerper fuer brotroester

Also Published As

Publication number Publication date
US4918294A (en) 1990-04-17
DE3877155D1 (de) 1993-02-11
EP0317822A2 (fr) 1989-05-31
EP0317822A3 (en) 1989-07-26

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