EP0635992B1 - Heating element - Google Patents

Heating element Download PDF

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Publication number
EP0635992B1
EP0635992B1 EP94116116A EP94116116A EP0635992B1 EP 0635992 B1 EP0635992 B1 EP 0635992B1 EP 94116116 A EP94116116 A EP 94116116A EP 94116116 A EP94116116 A EP 94116116A EP 0635992 B1 EP0635992 B1 EP 0635992B1
Authority
EP
European Patent Office
Prior art keywords
connector
turns
heater element
heating element
heating
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
EP94116116A
Other languages
German (de)
French (fr)
Other versions
EP0635992A3 (en
EP0635992A2 (en
Inventor
Roger Eisenberg
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.)
SEB SA
Original Assignee
SEB SA
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 SEB SA filed Critical SEB SA
Priority to DE9007828U priority Critical patent/DE9007828U1/en
Publication of EP0635992A2 publication Critical patent/EP0635992A2/en
Publication of EP0635992A3 publication Critical patent/EP0635992A3/en
Application granted granted Critical
Publication of EP0635992B1 publication Critical patent/EP0635992B1/en
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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/04—Pins or blades for co-operation with sockets
    • H01R13/05—Resilient pins or blades
    • H01R13/052—Resilient pins or blades co-operating with sockets having a circular transverse section

Definitions

  • the present invention relates to a heating element and an electrical connector for a heating element comprising means for fixing it to one end of said element heating and to connect it to a power conductor electric.
  • Such heating elements are used in particular in toaster.
  • These heating elements generally include a bar or tube of electrically insulating material around from which is wound helically a resistive heating wire.
  • This resistive heating wire is brought to a very high temperature when supplied with electric current.
  • the object of the present invention is to create an element heater that meets the above conditions while being of an inexpensive manufacturing cost compatible with a very large series production.
  • this heating element is characterized in that the resistive heating wire comprises at minus one coil end fixed by welding to the connector, the coil end being wound helically.
  • the connector electric 1 for the heating element 2 consists of a cut metal sheet with slots 3, 4, 5, 6, 7 (see Figure 4). This cut sheet is rolled around an axis x-x '(see Figures 1 and 2) intended to correspond to that of the heating element 2.
  • slots 3, 4, 5, 6, 7, and the tongue 9 extend, before rolling the sheet perpendicular to the x-x 'axis around which the sheet the cut is then rolled.
  • the tongue part 9 is connected to part 8 having slots 3, 4, 5, 6, 7 by a tab 10 of which the width measured in the direction of the length of the tongue 8 is less than the height of the slots 3, 4, 5, 6, 7.
  • the dimensions of the cut sheet are such that when it is rolled around said axis x-x ', the opposite ends of tongue 9 and opposite tops slots 3, 4, 5, 6, 7 are almost in contact (see Figures 1 and 3).
  • the sheet from which the connector according to the invention is preferably made of metal or alloy good conductor of heat and electricity and having a certain elasticity such as brass.
  • FIG. 1 and 5 show that connector 1 is associated with an electrical power supply conductor by a cut metal blade 11 of the same kind as the connector 1.
  • This blade 11 has two tabs cut 12, 13, folded and curved towards each other so as to define substantially a surface therebetween cylindrical 14a (see FIG. 5) adapted to that defined by the rolled part 8 having the slots of the connector 1.
  • part 11a of the blade 11 adjacent to the two tabs 12, 13, has a curvature
  • the convexity is directed opposite the tongues 12, 13, and which substantially follows the curvature of these tongues 12, 13. So when part 8 of connector 1 is snapped between the tongues 12, 13, the profile thereof as well as part 11a of the blade located between these latter wife perfectly the cylindrical outline of part 8 of the connector.
  • the connector 1 is fixed to one of the ends 2a of a heating element 2 comprising a tube 14 electrically insulating material such as soapstone, around which a resistive wire is helically wound heating 15.
  • a cap 16 made of insulating material is fixed around the part 9 forming a tongue and the part with tight turns 15a of the resistive wire and partly around of part 8 presenting slots.
  • slots 3, 4, 5, 6, 7 of the game rolled 8 of the connector defining between them openings through which air can circulate.
  • This air circulation ensures cooling of the entire connector 1, so that it does not risk no overheating due to direct contact with the heating wire 15.
  • connector 1 is extremely simple since it is carried out by simple cutting and rolling of a metal sheet which are easily automated.
  • connector 1 on the element heater 2 is also simple and automatable, since simply consists of a nesting along the axis x-x '.
  • part 8 of the connector may not be rolled, and remain flat, such as after cutting.
  • the tongues 12 and 13, instead of being shaped like a lyre, are then shaped into jaws, the connector engaging between it according to the knife switch system.

Landscapes

  • Resistance Heating (AREA)

Description

La présente invention concerne un élément chauffant et un connecteur électrique pour élément chauffant comprenant des moyens pour le fixer à une extrémité dudit élément chauffant et pour le connecter à un conducteur d'alimentation électrique.The present invention relates to a heating element and an electrical connector for a heating element comprising means for fixing it to one end of said element heating and to connect it to a power conductor electric.

De tels éléments chauffants équipent notamment des grille-pain.Such heating elements are used in particular in toaster.

Ces éléments chauffants comprennent généralement un barreau ou tube en matière électriquement isolante autour duquel est enroulé hélicoïdalement un fil résistif chauffant.These heating elements generally include a bar or tube of electrically insulating material around from which is wound helically a resistive heating wire.

Ce fil résistif chauffant est porté à une très haute température lorsqu'il est alimenté en courant électrique.This resistive heating wire is brought to a very high temperature when supplied with electric current.

Le raccordement mécanique et électrique entre l'extrémité de l'élément chauffant et le conducteur d'alimentation électrique pose des difficultés techniques du fait précisément de la haute température à laquelle est portée le fil résistif chauffant.The mechanical and electrical connection between the end of the heating element and the conductor power supply poses technical difficulties made precisely from the high temperature at which is carried the resistive heating wire.

Il faut en effet que ce raccordement résiste à cette haute température, de sorte que la liaison mécanique et électrique avec l'élément chauffant reste intacte, même après une multitude de cycles de chauffage et de refroidissement.This connection must indeed resist this high temperature, so the mechanical connection and electric with the heating element remains intact even after a multitude of heating and cooling cycles.

Le but de la présente invention est de créer un élément chauffant qui remplisse les conditions ci-dessus tout en étant d'un coût de fabrication peu onéreux compatible avec une production en très grande série.The object of the present invention is to create an element heater that meets the above conditions while being of an inexpensive manufacturing cost compatible with a very large series production.

Suivant l'invention, cet élément chauffant est caractérisé en ce que le fil résistif chauffant comporte au moins une extrémité à spires fixée par soudage sur le connecteur, l'extrémité à spires étant enroulée hélicoïdalement.According to the invention, this heating element is characterized in that the resistive heating wire comprises at minus one coil end fixed by welding to the connector, the coil end being wound helically.

D'autres particularités et avantages de l'invention apparaítront encore dans la description ci-après, aux dessins annexés donnés à titre d'exemples non limitatifs :

  • La figure 1 est une vue en perspective d'un connecteur électrique selon l'invention et du conducteur électrique qui lui est associé.
  • La figure 2 est une vue de côté du connecteur.
  • La figure 3 est une vue en bout selon la flèche F de la figure 2.
  • La figure 4 est une vue en plan de la feuille métallique découpée plane à partir de laquelle est réalisé le connecteur.
  • La figure 5 est une vue suivant l'axe du connecteur fixé à la lame conductrice.
  • La figure 6 est une vue en coupe longitudinale partielle d'un élément chauffant auquel est fixé le connecteur.
Other features and advantages of the invention will become apparent in the description below, in the accompanying drawings given by way of non-limiting examples:
  • Figure 1 is a perspective view of an electrical connector according to the invention and the electrical conductor associated therewith.
  • Figure 2 is a side view of the connector.
  • FIG. 3 is an end view along arrow F of FIG. 2.
  • Figure 4 is a plan view of the planar cut metal sheet from which the connector is made.
  • Figure 5 is a view along the axis of the connector attached to the conductive strip.
  • Figure 6 is a partial longitudinal sectional view of a heating element to which the connector is attached.

Dans la réalisation des figures annexées, le connecteur électrique 1 pour l'élément chauffant 2 est constitué d'une feuille de métal découpée présentant des créneaux 3, 4, 5, 6, 7 (voir figure 4). Cette feuille découpée est roulée autour d'un axe x-x' (voir figures 1 et 2) destiné à correspondre à celui de l'élément chauffant 2.In the embodiment of the appended figures, the connector electric 1 for the heating element 2 consists of a cut metal sheet with slots 3, 4, 5, 6, 7 (see Figure 4). This cut sheet is rolled around an axis x-x '(see Figures 1 and 2) intended to correspond to that of the heating element 2.

On voit notamment sur les figures 1 à 4, que la partie 8 de la feuille présentant des créneaux 3, 4, 5, 6, 7, est prolongée par une partie en forme de languette 9 roulée autour de l'axe x-x' précité et destiné à coiffer l'extrémité 2a de l'élément chauffant 2, comme indiqué sur la figure 6.We see in particular in Figures 1 to 4, that the part 8 of the sheet having slots 3, 4, 5, 6, 7, is extended by a rolled tongue-shaped portion 9 around the aforementioned axis x-x 'and intended to cover the end 2a of the heating element 2, as shown in FIG. 6.

Comme indiqué sur la figure 4, les créneaux 3, 4, 5, 6, 7, et la languette 9 s'étendent, avant roulage de la feuille perpendiculairement à l'axe x-x' autour duquel la feuille découpée est ensuite roulée. As shown in Figure 4, slots 3, 4, 5, 6, 7, and the tongue 9 extend, before rolling the sheet perpendicular to the x-x 'axis around which the sheet the cut is then rolled.

On voit également notamment sur cette figure 4 que la partie formant languette 9 est reliée à la partie 8 présentant des créneaux 3, 4, 5, 6, 7 par une patte 10 dont la largeur mesurée dans la direction de la longueur de la languette 8 est inférieure à la hauteur des créneaux 3, 4, 5, 6, 7.We also see in particular in this figure 4 that the tongue part 9 is connected to part 8 having slots 3, 4, 5, 6, 7 by a tab 10 of which the width measured in the direction of the length of the tongue 8 is less than the height of the slots 3, 4, 5, 6, 7.

Par ailleurs, les dimensions de la feuille découpée sont telles que lorsqu'elle est roulée autour dudit axe x-x', les extrémités opposées de la languette 9 et les sommets opposés des créneaux 3, 4, 5, 6, 7 sont presque en contact (voir les figures 1 et 3).Furthermore, the dimensions of the cut sheet are such that when it is rolled around said axis x-x ', the opposite ends of tongue 9 and opposite tops slots 3, 4, 5, 6, 7 are almost in contact (see Figures 1 and 3).

La feuille à partir de laquelle est réalisé le connecteur selon l'invention est de préférence en métal ou alliage bon conducteur de la chaleur et de l'électricité et ayant une certaine élasticité tel que le laiton.The sheet from which the connector according to the invention is preferably made of metal or alloy good conductor of heat and electricity and having a certain elasticity such as brass.

Les figures 1 et 5 montrent que le connecteur 1 est associé à un conducteur d'alimentation électrique constitué par une lame métallique découpée 11 de même nature que le connecteur 1. Cette lame 11 présente deux languettes découpées 12, 13, repliées et recourbées l'une vers l'autre de façon à définir entre-elles une surface sensiblement cylindrique 14a (voir figure 5) adaptée à celle définie par la partie roulée 8 présentant les créneaux du connecteur 1.Figures 1 and 5 show that connector 1 is associated with an electrical power supply conductor by a cut metal blade 11 of the same kind as the connector 1. This blade 11 has two tabs cut 12, 13, folded and curved towards each other so as to define substantially a surface therebetween cylindrical 14a (see FIG. 5) adapted to that defined by the rolled part 8 having the slots of the connector 1.

On voit également sur les figures 1 et 5 que les extrémités des languettes 12, 13, présentent une partie repliée vers l'extérieur 12a, 13a de façon à faciliter la fixation de la partie 8 présentant les créneaux du connecteur 1, par emboítement de celle-ci entre les deux languettes 12, 13 dans le sens de la flèche F, représentée sur la figure 1.We also see in Figures 1 and 5 that the ends of the tongues 12, 13, have a part folded outwards 12a, 13a so as to facilitate fixing of part 8 presenting the slots of the connector 1, by fitting it between the two tongues 12, 13 in the direction of arrow F, shown in FIG. 1.

Cette forme est connue sous le nom de "lyre".This form is known as "lyre".

Par ailleurs, la partie 11a de la lame 11 adjacente aux deux languettes 12, 13, présente une courbure dont la convexité est dirigée à l'opposé des languettes 12, 13, et qui suit sensiblement la courbure de ces languettes 12, 13. Ainsi, lorsque la partie 8 du connecteur 1 est encliquetée entre les languettes 12, 13, le profil de celles-ci ainsi que la partie 11a de la lame située entre ces dernières épouse parfaitement le contour cylindrique de la partie 8 du connecteur.Furthermore, the part 11a of the blade 11 adjacent to the two tabs 12, 13, has a curvature, the convexity is directed opposite the tongues 12, 13, and which substantially follows the curvature of these tongues 12, 13. So when part 8 of connector 1 is snapped between the tongues 12, 13, the profile thereof as well as part 11a of the blade located between these latter wives perfectly the cylindrical outline of part 8 of the connector.

Sur la figure 6, le connecteur 1 est fixé à l'une des extrémités 2a d'un élément chauffant 2 comprenant un tube 14 en matière électriquement isolante telle que de la stéatite, autour duquel est enroulé hélicoïdalement un fil résistif chauffant 15.In FIG. 6, the connector 1 is fixed to one of the ends 2a of a heating element 2 comprising a tube 14 electrically insulating material such as soapstone, around which a resistive wire is helically wound heating 15.

On voit sur cette figure, que la partie formant languette 9 roulée autour de l'axe x-x' est emboítée sur l'extrémité 2a du tube 14 et que le fil résistif 15 est enroulé autour de la partie 9 formant languette selon des spires 15a plus serrées que sur le reste du tube 14. Cette extrémité à spires resserrées 15a du fil résistif 15 est fixée sur la partie 9 par soudage.We see in this figure, that the part forming tab 9 rolled around the axis x-x 'is fitted on the end 2a of the tube 14 and that the resistive wire 15 is wrapped around part 9 forming a tab according to turns 15a tighter than on the rest of tube 14. This end with tight turns 15a of the resistive wire 15 is fixed on part 9 by welding.

Par ailleurs, un capuchon 16 en matière isolante est fixé autour de la partie 9 formant languette et de la partie à spires resserrées 15a du fil résistif et en partie autour de la partie 8 présentant des créneaux.Furthermore, a cap 16 made of insulating material is fixed around the part 9 forming a tongue and the part with tight turns 15a of the resistive wire and partly around of part 8 presenting slots.

Les principaux avantages techniques du connecteur électrique que l'on vient de décrire sont les suivants :The main technical advantages of the connector that we have just described are the following:

Tout d'abord, les créneaux 3, 4, 5, 6, 7 de la partie roulée 8 du connecteur définissant entre eux des ouvertures par lesquelles l'air peut circuler.First, slots 3, 4, 5, 6, 7 of the game rolled 8 of the connector defining between them openings through which air can circulate.

Cette circulation d'air assure un refroidissement de l'ensemble du connecteur 1, de sorte que celui-ci ne risque pas de s'échauffer excessivement du fit de son contact direct avec le fil chauffant 15. This air circulation ensures cooling of the entire connector 1, so that it does not risk no overheating due to direct contact with the heating wire 15.

Par ailleurs, grâce à ce refroidissement les dilatations et contractions thermiques subies par le connecteur 1 à la suite d'une multitude de cycles d'échauffement et de refroidissement ne risquent pas d'affecter les propriétés mécaniques de connecteur de sorte qu'une parfaite liaison mécanique et une excellente liaison électrique entre le connecteur 1 et le fil chauffant 15 sont maintenues pendant une très longue durée de service.Furthermore, thanks to this cooling, the expansions and thermal contractions undergone by connector 1 at the following a multitude of heating cycles and cooling will not affect the properties connector mechanics so that a perfect bond mechanical and an excellent electrical connection between the connector 1 and the heating wire 15 are maintained for a very long service life.

D'une part, la fabrication du connecteur 1 est extrêmement simple puisqu'elle est réalisée par simple découpage et roulage d'une feuille métallique qui sont aisément automatisables.On the one hand, the manufacture of connector 1 is extremely simple since it is carried out by simple cutting and rolling of a metal sheet which are easily automated.

En outre, le montage du connecteur 1 sur l'élément chauffant 2 est également simple et automatisable, puisqu'il consiste simplement en un emboítement suivant l'axe x-x'.In addition, the mounting of connector 1 on the element heater 2 is also simple and automatable, since simply consists of a nesting along the axis x-x '.

Bien entendu, l'invention n'est pas limitée à l'exemple de réalisation que l'on vient de décrire et on peut apporter à celui-ci de nombreuses modifications sans sortir du cadre de l'invention.Of course, the invention is not limited to the example of realization that we just described and we can bring many modifications to it without going outside the framework of the invention.

C'est ainsi que la partie 8 du connecteur peut ne pas être roulée, et rester plate, telle qu'issue du découpage. Les languettes 12 et 13, au lieu d'être conformées en lyre, sont alors conformées en mâchoires, le connecteur s'engageant entre celle-ci selon le système des interrupteurs à couteaux.This is how part 8 of the connector may not be rolled, and remain flat, such as after cutting. The tongues 12 and 13, instead of being shaped like a lyre, are then shaped into jaws, the connector engaging between it according to the knife switch system.

Claims (4)

  1. A heater element (2), in particular for a toaster, comprising a tube (14) made of electrically insulating material about which a heating resistive wire (15) is wound, and at least one electrical connector (1) fixed to the ends (2a) of the heater element (2) and welded to said heating resistive wire (15),
    said heater element being characterized in that the heating resistive wire (15) includes at least one end with turns (15a) which is fixed by welding onto the connector (1), the end with turns being wound helically thereabout.
  2. A heater element according to claim 1, characterized in that the end with turns (15a) which is fixed by welding includes turns (15a) that are closer together than over the remainder of the tube (14).
  3. A heater element according to claim 2, characterized in that the connector (1) includes a tongue-forming portion (9) about which the end having closer-together turns (15a) is wound and welded.
  4. An element according to claim 3, characterized in that the tongue (9) is engaged on the end (2a) of the heater element (2).
EP94116116A 1989-01-27 1990-01-24 Heating element Expired - Lifetime EP0635992B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9007828U DE9007828U1 (en) 1989-01-27 1990-01-24 Heating element

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8901017 1989-01-27
FR8901017A FR2642573B1 (en) 1989-01-27 1989-01-27 ELECTRICAL CONNECTOR FOR HEATING ELEMENT
EP19900400211 EP0380417B1 (en) 1989-01-27 1990-01-24 Electrical connector for a heating element

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP19900400211 Division EP0380417B1 (en) 1989-01-27 1990-01-24 Electrical connector for a heating element
EP90400211.0 Division 1990-01-24

Publications (3)

Publication Number Publication Date
EP0635992A2 EP0635992A2 (en) 1995-01-25
EP0635992A3 EP0635992A3 (en) 1995-09-20
EP0635992B1 true EP0635992B1 (en) 1998-10-14

Family

ID=9378170

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19900400211 Expired - Lifetime EP0380417B1 (en) 1989-01-27 1990-01-24 Electrical connector for a heating element
EP94116116A Expired - Lifetime EP0635992B1 (en) 1989-01-27 1990-01-24 Heating element

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19900400211 Expired - Lifetime EP0380417B1 (en) 1989-01-27 1990-01-24 Electrical connector for a heating element

Country Status (4)

Country Link
EP (2) EP0380417B1 (en)
DE (3) DE69032705T2 (en)
ES (2) ES2097714T3 (en)
FR (1) FR2642573B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903961A1 (en) * 1989-02-10 1990-08-16 Wuerth Friedrich Fa HEATING ELEMENT
FR2720917B1 (en) * 1994-06-08 1996-07-26 Seb Sa Mobile heating element for electric cooking appliance.
EP2626647B1 (en) 2011-03-30 2014-06-11 Eberspächer catem GmbH & Co. KG Method for producing a plate element comprising a circuit board

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR403305A (en) * 1908-09-15 1909-10-30 Charles Orme Bastian Improvements in methods and devices used to transform electrical energy into heat energy
US1538972A (en) * 1925-02-17 1925-05-26 Conradty Ottmar Electric heater
GB759946A (en) * 1954-03-09 1956-10-24 Emi Ltd Improvements in or relating to electric resistance heating elements
US3300621A (en) * 1964-04-22 1967-01-24 Fischer Karl Electric hotplate and method of making same
GB1267151A (en) * 1970-01-20 1972-03-15
DE7634006U1 (en) * 1976-10-28 1978-04-20 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart FLAT RADIATOR FOR AN ELECTRIC BREAD ROESTER OR TOASTER
FR2592264B1 (en) * 1985-09-27 1989-06-02 Chauffe Eau Cie Indle HEATING RESISTANCE DEVICE WITH QUICK CONNECTION SYSTEM, AND APPARATUS PROVIDED WITH SUCH APPARATUS
DE3903961A1 (en) * 1989-02-10 1990-08-16 Wuerth Friedrich Fa HEATING ELEMENT

Also Published As

Publication number Publication date
EP0635992A3 (en) 1995-09-20
DE69018843D1 (en) 1995-06-01
EP0380417A1 (en) 1990-08-01
DE635992T1 (en) 1997-06-26
EP0635992A2 (en) 1995-01-25
ES2072994T3 (en) 1995-08-01
FR2642573B1 (en) 1993-09-17
ES2097714T3 (en) 1998-12-16
DE69018843T2 (en) 1995-12-07
DE69032705D1 (en) 1998-11-19
ES2097714T1 (en) 1997-04-16
EP0380417B1 (en) 1995-04-26
DE69032705T2 (en) 1999-04-22
FR2642573A1 (en) 1990-08-03

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