EP2227818B1 - Thermal safety device - Google Patents

Thermal safety device Download PDF

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Publication number
EP2227818B1
EP2227818B1 EP09719749.5A EP09719749A EP2227818B1 EP 2227818 B1 EP2227818 B1 EP 2227818B1 EP 09719749 A EP09719749 A EP 09719749A EP 2227818 B1 EP2227818 B1 EP 2227818B1
Authority
EP
European Patent Office
Prior art keywords
lever
safety device
thermal safety
metal strip
contact
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
EP09719749.5A
Other languages
German (de)
French (fr)
Other versions
EP2227818A2 (en
Inventor
Peter Ireman
Lionnel Durand
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
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Filing date
Publication date
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Publication of EP2227818A2 publication Critical patent/EP2227818A2/en
Application granted granted Critical
Publication of EP2227818B1 publication Critical patent/EP2227818B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/36—Means for applying mechanical tension to fusible member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H01H2037/046—Bases; Housings; Mountings being soldered on the printed circuit to be protected
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
    • H01H2037/763—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts the spring being a blade spring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0275—Structural association with a printed circuit board

Definitions

  • the present invention relates to a thermal safety device for a heating element deposited on a substrate forming a heating subassembly included in particular in a household appliance.
  • EP 0654170 a temperature sensitive circuit breaker, intended to be fixed on a substrate, comprising a spring blade provided at each of its ends with a contact welded to a corresponding contact pad on the substrate. Between the two welded contacts, the spring blade comprises an arm consisting of a roof-shaped portion followed by a flat section.
  • the circuit breaker is activated by applying a pressure on the roof which generates a bending of the flat section and a lifting torque of the contact located next to the section.
  • the solder contact melts and the lifting torque causes a lateral displacement of the contact that opens the circuit.
  • the opening of the contact is generated by a low deformation of the roof, which imposes a very good control of the dimensions of the spring and the various parts putting pressure on the roof.
  • this type of circuit breaker requires significant contact spacing to accommodate the roof-shaped portion and the flat portion.
  • Document is also known WO 98/20510 a thermal safety device comprising a metal blade welded to a substrate between two contact pads.
  • the blade has a cantilever end which is mechanically stressed by a wall of a housing. During overheating at the contact pads, the welds melt and the stress exerted on the end of the blade causes the opening of the circuit by spacing the contact located opposite the end cantilevered.
  • this thermal safety device works only if the two welds of the pads melt simultaneously, which imposes the same thermal environment for each pad.
  • the metal blade with its end cantilever is long and therefore difficult to implement in a small footprint.
  • EP 0 562 438 A discloses a thermal safety device according to the preamble of claim 1.
  • the object of the present invention is to overcome the aforementioned drawbacks and to provide a thermal safety device which has high reliability and safe operation.
  • Another object of the invention is to provide a thermal safety device which is simple and economical to implement.
  • Another object of the invention is to provide a thermal safety device that is compact to be installed in a small footprint.
  • a thermal safety device intended to be fixed on a substrate comprising a fuse blade comprising a metal strip provided with a first contact zone electrically connected to a first pad on the substrate and also provided with at least one another contact zone capable of being welded to another pad on the substrate, the fuse blade also comprising a lever comprising a free end, not connected to the metal band, characterized in that the lever generates a tilting torque of the zone of welded contact, around at least one pivot point disposed between the two contact zones when pressing on the end of the lever.
  • the thermal safety device thus produced comprises a fuse blade whose shape is stable when soldered on the substrate and the device is then activated by pressing on the end of the lever.
  • the pivot point around which the tilting torque is generated by the lever is located between the two contact zones, which allows a compact construction of the device.
  • the support on the end of the lever is located outside the two contact zones.
  • This arrangement makes it possible to obtain a sufficiently long lever arm to guarantee, during an overheating of the device, a displacement of the zone of contact with the pad with an even greater margin of safety for electrical insulation.
  • the lever comprises two arms arranged laterally to the metal strip.
  • This arrangement makes it possible to balance the forces generating the tilting torque of the welded contact zone.
  • each arm of the lever comprises stiffening means.
  • This arrangement makes it possible to avoid bending the arms of the lever in order to transmit the tilting torque to the welded contact zone.
  • the stiffening means of each arm of the lever are formed by a longitudinal fold.
  • the metal strip comprises at least two folds located between the pivot point and the first contact zone.
  • This arrangement makes it possible to create additional pivot points which amplify the opening of the contact zone.
  • the metal strip and the lever are formed in the same metal strip.
  • This arrangement makes it possible to produce the fuse blade of the thermal safety device in a simple and economical manner.
  • At least the welded contact zone is brazed by reflow.
  • This arrangement makes it possible to produce, in a single production phase, the fixing of all the components to be soldered on the substrate, such as electronic components, connection elements, etc.
  • the thermal safety device is incorporated in a heating base for a liquid heating device.
  • the thermal safety device comprises a fusible blade 20 fixed on a substrate 2 comprising a metal disk 3 of stainless steel provided with a screen-printed heating resistor 4 sandwiched between two layers of insulating enamels.
  • the outer enamel layer comprises lights in which contact pads are deposited.
  • the heating base comprises the female part of a removable connector composed of two feed pins 11, 12 welded to two contact pads 9, 10, an earth pin 13 connected directly to the metal disc 3 and an envelope plastic 15 capping the three pins 11, 12, 13.
  • the heating base also comprises heating resistance control means not shown in the figure.
  • the heating resistor 4 has an end provided with a hot pad 7 which remains, when the apparatus is heating, relatively hot because of the trace of the heating resistor track 4.
  • the supply pin 12 is connected to a track comprising an end provided with a cold pad 8 which remains relatively cold when the device heats.
  • the fuse blade 20 comprises a metal strip 21 comprising two ends each provided with a contact zone 22, 23 respectively welded to the hot pad 7 and the cold pad 8.
  • the fuse blade 20 thus electrically connects the heating resistor 4 to the pin 12 power supply.
  • the fuse blade 20 also comprises a lever 30 comprising two arms 34, 35 disposed laterally to the metal strip 21 and integral with the latter at the contact zone 22 welded to the hot pad 7.
  • the two arms 34, 35 of the lever 30 each comprise a first portion 32, 33 parallel to the metal strip 21 and a second inclined portion 38, 39.
  • the inclined portions 38, 39 meet to form an end 36 acting as a support zone.
  • the junction between the first portion 32, 33 and the second inclined portion 38, 39 defines a pivot point 37 about a transverse axis 42.
  • the metal strip 21 comprises between the pivot point 37 and the contact zone 23 welded to the cold pad 8, three successive folds 24, 25, 26 forming an inverted V.
  • Each arm 34, 35 of the lever 30 comprises in its inclined portion 38, 39 an outer edge provided with a longitudinal fold 40, 41 of reinforcement.
  • the fuse blade 20 has a stable shape to allow its welding on the substrate without particular holding means.
  • the plastic plug 15 of the connector is assembled on the supply pins 11, 12 and on the ground pin 13 ( figure 1 ).
  • the latter comprises a lateral protrusion 16 pivoting the arms 34, 35 of the lever 30 by pressing on the end 36 during the vertical assembly movement. This movement of the arms 34, 35 generates a tilting torque of the contact zone 22 welded to the hot pad 7 around the pivot point 37.
  • the temperature around the hot pad 7 reaches the fusion temperature of the solder ( figure 4 ).
  • the torque generated by the arms 34, 35 of the lever 30 tilts the contact zone 22 mainly around the pivot point 37, but this pivot point 37 can itself pivot around the three folds 24, 25, 26 of the metal strip. 21 to allow a displacement of the contact zone 22 relative to the hot pad 7 greater than three millimeters and thus cut the supply circuit of the heating resistor 4 and ensure electrical insulation.
  • the heating resistor 4 is positioned on the substrate 2 so that the other welds do not melt, in particular that of the cold pad 8 which holds the fuse blade 20 in place even after fusion of the solder at the hot pad 7.
  • the metal strip of the fuse blade may not include folds and be straight.
  • the lever arm can be attached to the metal strip by a welding type assembly means or crimping.
  • the lever can be cut in the center of the metal strip.
  • the free end of the lever is located between the pivot point and the contact area welded to the cold pad.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)

Description

La présente invention concerne un dispositif de sécurité thermique pour un élément chauffant déposé sur un substrat formant un sous ensemble chauffant inclus notamment dans un appareil électroménager.The present invention relates to a thermal safety device for a heating element deposited on a substrate forming a heating subassembly included in particular in a household appliance.

On connaît du document EP 0654170 un coupe circuit sensible à la température, destiné à être fixé sur un substrat, comportant une lame ressort munie à chacune de ses extrémités d'un contact soudé à un plot de contact correspondant sur le substrat. Entre les deux contacts soudés, la lame ressort comprend un bras constitué d'une partie en forme de toit suivie d'un tronçon plat. Le coupe circuit est activé en appliquant une pression sur le toit qui génère un cintrage du tronçon plat et un couple de soulèvement du contact situé à côté du tronçon. Lors d'une surchauffe du substrat, la brasure du contact fond et le couple de soulèvement provoque un déplacement latéral du contact qui ouvre le circuit. Toutefois, l'ouverture du contact est générée par une faible déformation du toit, ce qui impose une très bonne maîtrise des dimensions du ressort et des différentes pièces mettant en pression le toit. De plus, ce type de coupe circuit nécessite un espacement des contacts important pour loger la partie en forme de toit et le tronçon plat.Document is known EP 0654170 a temperature sensitive circuit breaker, intended to be fixed on a substrate, comprising a spring blade provided at each of its ends with a contact welded to a corresponding contact pad on the substrate. Between the two welded contacts, the spring blade comprises an arm consisting of a roof-shaped portion followed by a flat section. The circuit breaker is activated by applying a pressure on the roof which generates a bending of the flat section and a lifting torque of the contact located next to the section. During overheating of the substrate, the solder contact melts and the lifting torque causes a lateral displacement of the contact that opens the circuit. However, the opening of the contact is generated by a low deformation of the roof, which imposes a very good control of the dimensions of the spring and the various parts putting pressure on the roof. In addition, this type of circuit breaker requires significant contact spacing to accommodate the roof-shaped portion and the flat portion.

On connaît également du document WO 98/20510 un dispositif de sécurité thermique comprenant une lame métallique soudée sur un substrat entre deux plots de contact. La lame présente une extrémité en porte à faux qui est mise sous contrainte mécanique par une paroi d'un boîtier. Lors d'une surchauffe au niveau des plots de contact, les soudures fondent et la contrainte exercée sur l'extrémité de la lame provoque l'ouverture du circuit par écartement du contact situé à l'opposé de l'extrémité en porte à faux. Toutefois, ce dispositif de sécurité thermique fonctionne uniquement si les deux soudures des plots fondent simultanément, ce qui impose le même environnement thermique pour chaque plot. De plus, la lame métallique munie de son extrémité en porte à faux est longue et donc difficile à implanter dans un encombrement réduit.Document is also known WO 98/20510 a thermal safety device comprising a metal blade welded to a substrate between two contact pads. The blade has a cantilever end which is mechanically stressed by a wall of a housing. During overheating at the contact pads, the welds melt and the stress exerted on the end of the blade causes the opening of the circuit by spacing the contact located opposite the end cantilevered. However, this thermal safety device works only if the two welds of the pads melt simultaneously, which imposes the same thermal environment for each pad. In addition, the metal blade with its end cantilever is long and therefore difficult to implement in a small footprint.

Le document " EP 0 562 438 A " décrit un dispositif de sécurité thermique selon le préambule de la revendication 1.The document " EP 0 562 438 A "discloses a thermal safety device according to the preamble of claim 1.

Le but de la présente invention est de remédier aux inconvénients précités et de proposer un dispositif de sécurité thermique qui présente une grande fiabilité et un fonctionnement sûr.The object of the present invention is to overcome the aforementioned drawbacks and to provide a thermal safety device which has high reliability and safe operation.

Un autre but de l'invention est de proposer un dispositif de sécurité thermique qui soit simple et économique à mettre en oeuvre.Another object of the invention is to provide a thermal safety device which is simple and economical to implement.

Un autre but de l'invention est de proposer un dispositif de sécurité thermique qui soit compact pour être installé dans un encombrement réduit.Another object of the invention is to provide a thermal safety device that is compact to be installed in a small footprint.

Ces buts sont atteints avec un dispositif de sécurité thermique destiné à être fixé sur un substrat comprenant une lame fusible comportant une bande métallique munie d'une première zone de contact reliée électriquement à un premier plot sur le substrat et munie également d'au moins une autre zone de contact apte à être soudée avec un autre plot sur le substrat, la lame fusible comportant également un levier comprenant une extrémité libre, non reliée à la bande métallique, caractérisé en ce que le levier génère un couple de basculement de la zone de contact soudée, autour d'au moins un point de pivotement disposé entre les deux zones de contact lors d'un appui sur l'extrémité du levier.These objects are achieved with a thermal safety device intended to be fixed on a substrate comprising a fuse blade comprising a metal strip provided with a first contact zone electrically connected to a first pad on the substrate and also provided with at least one another contact zone capable of being welded to another pad on the substrate, the fuse blade also comprising a lever comprising a free end, not connected to the metal band, characterized in that the lever generates a tilting torque of the zone of welded contact, around at least one pivot point disposed between the two contact zones when pressing on the end of the lever.

Le dispositif de sécurité thermique ainsi réalisé comporte une lame fusible dont la forme est stable lors de sa soudure sur le substrat et le dispositif est activé ensuite par un appui sur l'extrémité du levier. Selon l'invention, le point de pivotement autour duquel le couple de basculement est généré par le levier, est situé entre les deux zones de contact, ce qui permet une construction compacte du dispositif.The thermal safety device thus produced comprises a fuse blade whose shape is stable when soldered on the substrate and the device is then activated by pressing on the end of the lever. According to the invention, the pivot point around which the tilting torque is generated by the lever, is located between the two contact zones, which allows a compact construction of the device.

Avantageusement, l'appui sur l'extrémité du levier est situé à l'extérieur des deux zones de contact.Advantageously, the support on the end of the lever is located outside the two contact zones.

Cette disposition permet d'obtenir un bras de levier suffisamment long pour garantir lors d'une surchauffe du dispositif, un déplacement de la zone de contact par rapport au plot avec une marge de sécurité encore plus importante pour une isolation électrique.This arrangement makes it possible to obtain a sufficiently long lever arm to guarantee, during an overheating of the device, a displacement of the zone of contact with the pad with an even greater margin of safety for electrical insulation.

De préférence, le levier comporte deux bras disposés latéralement à la bande métallique.Preferably, the lever comprises two arms arranged laterally to the metal strip.

Cette disposition permet d'équilibrer les efforts générant le couple de basculement de la zone de contact soudée.This arrangement makes it possible to balance the forces generating the tilting torque of the welded contact zone.

Avantageusement, chaque bras du levier comporte des moyens de rigidification.Advantageously, each arm of the lever comprises stiffening means.

Cette disposition permet d'éviter la flexion des bras du levier pour transmettre le couple de basculement à la zone de contact soudée.This arrangement makes it possible to avoid bending the arms of the lever in order to transmit the tilting torque to the welded contact zone.

De préférence, les moyens de rigidification de chaque bras du levier sont formés par un pli longitudinal.Preferably, the stiffening means of each arm of the lever are formed by a longitudinal fold.

Cette disposition permet de réaliser une rigidification des bras de levier de manière simple et économique sans ajouter de pièces.This arrangement makes it possible to stiffen the lever arms simply and economically without adding parts.

Avantageusement, la bande métallique comporte au moins deux plis situés entre le point de pivotement et la première zone de contact.Advantageously, the metal strip comprises at least two folds located between the pivot point and the first contact zone.

Cette disposition permet de créer des points de pivotement supplémentaires qui amplifient l'ouverture de la zone de contact.This arrangement makes it possible to create additional pivot points which amplify the opening of the contact zone.

De préférence, la bande métallique et le levier sont formés dans un même feuillard métallique.Preferably, the metal strip and the lever are formed in the same metal strip.

Cette disposition permet de réaliser la lame fusible du dispositif de sécurité thermique de manière simple et économique.This arrangement makes it possible to produce the fuse blade of the thermal safety device in a simple and economical manner.

Avantageusement, au moins la zone de contact soudée est brasée par refusion.Advantageously, at least the welded contact zone is brazed by reflow.

Cette disposition permet de réaliser en une seule phase de production la fixation de tous les composants devant être soudés sur le substrat du type composants électroniques, éléments de connexion, ...This arrangement makes it possible to produce, in a single production phase, the fixing of all the components to be soldered on the substrate, such as electronic components, connection elements, etc.

L'invention sera mieux comprise à l'étude du mode de réalisation pris à titre nullement limitatif et illustré dans les figures annexées dans lesquelles :

  • La figure 1 illustre une vue en perspective d'un dispositif de sécurité thermique activé selon un mode particulier de réalisation de l'invention.
  • La figure 2 illustre une vue en perspective d'une lame fusible du dispositif de sécurité thermique de la figure 1.
  • La figure 3 illustre une vue en perspective du dispositif de sécurité thermique de la figure 1 dont la lame fusible est soudée sur un substrat avant l'appui sur le levier.
  • La figure 4 illustre une vue en perspective du dispositif de sécurité thermique de la figure 1 après fusion du contact soudé.
The invention will be better understood from the study of the embodiment taken in no way limiting and illustrated in the accompanying figures in which:
  • The figure 1 illustrates a perspective view of an activated thermal safety device according to a particular embodiment of the invention.
  • The figure 2 illustrates a perspective view of a fuse blade of the thermal safety device of the figure 1 .
  • The figure 3 illustrates a perspective view of the thermal safety device of the figure 1 whose fuse blade is welded to a substrate before pressing on the lever.
  • The figure 4 illustrates a perspective view of the thermal safety device of the figure 1 after fusion of the soldered contact.

Comme visible sur la figure 1, le dispositif de sécurité thermique est incorporé dans un fond chauffant pour un appareil de chauffage de liquides. Le dispositif de sécurité thermique comprend une lame fusible 20 fixée sur un substrat 2 comportant un disque métallique 3 en acier inoxydable muni d'une résistance chauffante 4 sérigraphiée prise entre deux couches d'émaux isolants. La couche d'émail externe comprend des lumières dans lesquelles sont déposés des plots de contact. Le fond chauffant comporte la partie femelle d'un connecteur amovible composée de deux broches d'alimentation 11, 12 soudées sur deux plots de contacts 9, 10, d'une broche de terre 13 reliée directement au disque métallique 3 et d'une enveloppe plastique 15 coiffant les trois broches 11, 12, 13. Le fond chauffant comporte également des moyens de régulation de la chauffe de la résistance non représentés sur la figure.As visible on the figure 1 , the thermal safety device is incorporated in a heating base for a liquid heating device. The thermal safety device comprises a fusible blade 20 fixed on a substrate 2 comprising a metal disk 3 of stainless steel provided with a screen-printed heating resistor 4 sandwiched between two layers of insulating enamels. The outer enamel layer comprises lights in which contact pads are deposited. The heating base comprises the female part of a removable connector composed of two feed pins 11, 12 welded to two contact pads 9, 10, an earth pin 13 connected directly to the metal disc 3 and an envelope plastic 15 capping the three pins 11, 12, 13. The heating base also comprises heating resistance control means not shown in the figure.

La résistance chauffante 4 comporte une extrémité munie d'un plot chaud 7 qui reste, lorsque l'appareil chauffe, relativement chaud du fait du tracé de la piste de la résistance chauffante 4. La broche d'alimentation 12 est connectée à une piste comprenant une extrémité munie d'un plot froid 8 qui reste relativement froid lorsque l'appareil chauffe.The heating resistor 4 has an end provided with a hot pad 7 which remains, when the apparatus is heating, relatively hot because of the trace of the heating resistor track 4. The supply pin 12 is connected to a track comprising an end provided with a cold pad 8 which remains relatively cold when the device heats.

Tel que visible sur la figure 2, la lame fusible 20 comporte une bande métallique 21 comprenant deux extrémités munies chacune d'une zone de contact 22, 23 soudée respectivement au plot chaud 7 et au plot froid 8. La lame fusible 20 relie donc électriquement la résistance chauffante 4 à la broche d'alimentation 12.As visible on the figure 2 , the fuse blade 20 comprises a metal strip 21 comprising two ends each provided with a contact zone 22, 23 respectively welded to the hot pad 7 and the cold pad 8. The fuse blade 20 thus electrically connects the heating resistor 4 to the pin 12 power supply.

La lame fusible 20 comporte également un levier 30 comprenant deux bras 34, 35 disposés latéralement à la bande métallique 21 et solidaires de cette dernière au niveau de la zone de contact 22 soudée au plot chaud 7. Les deux bras 34, 35 du levier 30 comprennent chacun une première partie 32, 33 parallèle à la bande métallique 21 puis une deuxième partie inclinée 38, 39. Les parties inclinées 38, 39 se rejoignent pour former une extrémité 36 faisant office de zone d'appui. La jonction entre la première partie 32, 33 et la deuxième partie inclinée 38, 39 définit un point de pivotement 37 autour d'un axe transversal 42.The fuse blade 20 also comprises a lever 30 comprising two arms 34, 35 disposed laterally to the metal strip 21 and integral with the latter at the contact zone 22 welded to the hot pad 7. The two arms 34, 35 of the lever 30 each comprise a first portion 32, 33 parallel to the metal strip 21 and a second inclined portion 38, 39. The inclined portions 38, 39 meet to form an end 36 acting as a support zone. The junction between the first portion 32, 33 and the second inclined portion 38, 39 defines a pivot point 37 about a transverse axis 42.

La bande métallique 21 comporte entre le point de pivotement 37 et la zone de contact 23 soudée au plot froid 8, trois plis 24, 25, 26 successifs formant un V inversé.The metal strip 21 comprises between the pivot point 37 and the contact zone 23 welded to the cold pad 8, three successive folds 24, 25, 26 forming an inverted V.

Chaque bras 34, 35 du levier 30 comprend dans sa partie inclinée 38, 39 un bord externe muni d'un pli longitudinal 40, 41 de renfort.Each arm 34, 35 of the lever 30 comprises in its inclined portion 38, 39 an outer edge provided with a longitudinal fold 40, 41 of reinforcement.

Tel que visible sur la figure 3, la lame fusible 20 a une forme stable pour permettre sa soudure sur le substrat sans moyens de maintien particulier.As visible on the figure 3 , the fuse blade 20 has a stable shape to allow its welding on the substrate without particular holding means.

Toutes les soudures des broches d'alimentations 11, 12 et des zones de contact 22, 23 de la lame fusible 20 sont réalisées par refusion lors d'une même opération de fabrication.All welds of the power supply pins 11, 12 and the contact zones 22, 23 of the fuse blade 20 are made by reflow during the same manufacturing operation.

Après soudure, on assemble sur les broches d'alimentation 11, 12 et sur la broche de terre 13 l'enveloppe plastique 15 du connecteur (figure 1). Celui ci comporte une excroissance latérale 16 venant faire pivoter les bras 34, 35 du levier 30 par pression sur l'extrémité 36 lors du mouvement vertical d'assemblage. Ce mouvement des bras 34, 35 génère un couple de basculement de la zone de contact 22 soudée au plot chaud 7 autour du point de pivotement 37. Une fois l'enveloppe plastique 15 du connecteur assemblée, le dispositif de sécurité thermique est activé.After soldering, the plastic plug 15 of the connector is assembled on the supply pins 11, 12 and on the ground pin 13 ( figure 1 ). The latter comprises a lateral protrusion 16 pivoting the arms 34, 35 of the lever 30 by pressing on the end 36 during the vertical assembly movement. This movement of the arms 34, 35 generates a tilting torque of the contact zone 22 welded to the hot pad 7 around the pivot point 37. Once the plastic envelope 15 of the assembled connector, the thermal safety device is activated.

En fonctionnement, en cas de défaillance des moyens de régulation de la chauffe de la résistance chauffante 4, la température autour du plot chaud 7 atteint la température de fusion de la soudure (figure 4). Le couple généré par les bras 34, 35 du levier 30 fait basculer la zone de contact 22 principalement autour du point de pivotement 37 mais ce point de pivotement 37 peut lui-même pivoter autour des trois plis 24, 25, 26 de la bande métallique 21 pour permettre un déplacement de la zone de contact 22 par rapport au plot chaud 7 supérieur à trois millimètres et ainsi couper le circuit d'alimentation de la résistance chauffante 4 et garantir une isolation électrique. La résistance chauffante 4 est positionnée sur le substrat 2 de manière à ce que les autres soudures ne fondent pas, en particulier celle du plot froid 8 qui maintient la lame fusible 20 en place même après fusion de la soudure au niveau du plot chaud 7.In operation, in the event of failure of the means for regulating the heating of the heating resistor 4, the temperature around the hot pad 7 reaches the fusion temperature of the solder ( figure 4 ). The torque generated by the arms 34, 35 of the lever 30 tilts the contact zone 22 mainly around the pivot point 37, but this pivot point 37 can itself pivot around the three folds 24, 25, 26 of the metal strip. 21 to allow a displacement of the contact zone 22 relative to the hot pad 7 greater than three millimeters and thus cut the supply circuit of the heating resistor 4 and ensure electrical insulation. The heating resistor 4 is positioned on the substrate 2 so that the other welds do not melt, in particular that of the cold pad 8 which holds the fuse blade 20 in place even after fusion of the solder at the hot pad 7.

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments ou par substitution d'équivalents techniques, sans sortir pour autant du domaine de protection de l'invention.Of course, the invention is not limited to the embodiment described and illustrated which has been given by way of example. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Ainsi, la bande métallique de la lame fusible peut ne pas comporter de plis et être rectiligne.Thus, the metal strip of the fuse blade may not include folds and be straight.

Dans une variante de réalisation, le bras de levier peut être rapporté sur la bande métallique par un moyen d'assemblage du type soudure ou sertissage.In an alternative embodiment, the lever arm can be attached to the metal strip by a welding type assembly means or crimping.

Dans une autre variante de réalisation, le levier peut être découpé au centre de la bande métallique. Dans ce cas, l'extrémité libre du levier est située entre le point de pivotement et la zone de contact soudée au plot froid.In another alternative embodiment, the lever can be cut in the center of the metal strip. In this case, the free end of the lever is located between the pivot point and the contact area welded to the cold pad.

Claims (8)

  1. Thermal safety device for attachment to a substrate (2) comprising a fusible strip (20) having a metal strip (21) provided with a first contact area (23) electrically connected to a first pad (8) on the substrate (2) and also provided with at least another contact area (22) adapted to be soldered with another pad (7) on the substrate (2), said fusible strip (20) also having a lever (30) comprising a free end (36), not connected to the metal strip (21), characterised in that the lever (30) generates a tilting moment of the soldered contact area (22) around at least one pivot point (37) arranged between the two contact areas (22, 23) when the end (36) of the lever (30) is pressed.
  2. Thermal safety device according to claim 1, characterised in that the end (36) of the lever (30) is pressed outside the two contact areas (22, 23).
  3. Thermal safety device according to claim 1 or 2, characterised in that the lever (30) comprises two arms (34, 35) arranged laterally with respect to the metal strip (21).
  4. Thermal safety device according to claim 3, characterised in that each arm (34, 35) of the lever (30) comprises stiffening means (40, 41).
  5. Thermal safety device according to claim 4, characterised in that the stiffening means of each arm (34, 35) of the lever (30) are formed by a longitudinal fold (40, 41).
  6. Thermal safety device according to one of claims 1 to 5, characterised in that the metal strip (21) has at least two folds (24, 25, 26) located between the pivot point (37) and the first contact area (23).
  7. Thermal safety device according to one of claims 1 to 6, characterised in that the metal strip (21) and the lever (30) are formed in a single metal strip.
  8. Thermal safety device according to one of claims 1 to 7, characterised in that at least the contact area (22) is soldered by reflow.
EP09719749.5A 2008-01-10 2009-01-06 Thermal safety device Not-in-force EP2227818B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0800136A FR2926394B1 (en) 2008-01-10 2008-01-10 THERMAL SAFETY DEVICE
PCT/FR2009/000004 WO2009112658A2 (en) 2008-01-10 2009-01-06 Thermal safety device

Publications (2)

Publication Number Publication Date
EP2227818A2 EP2227818A2 (en) 2010-09-15
EP2227818B1 true EP2227818B1 (en) 2014-08-20

Family

ID=39846598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09719749.5A Not-in-force EP2227818B1 (en) 2008-01-10 2009-01-06 Thermal safety device

Country Status (5)

Country Link
US (1) US20100277268A1 (en)
EP (1) EP2227818B1 (en)
CN (1) CN101911237B (en)
FR (1) FR2926394B1 (en)
WO (1) WO2009112658A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2919250B1 (en) * 2014-03-12 2017-06-28 BITRON S.p.A. Safety connecting device and apparatus including such a device
CN105869951B (en) * 2016-06-17 2018-07-03 佛山市格来德小家电有限公司 A kind of anti-dry kettle coupler of band fusing

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Also Published As

Publication number Publication date
EP2227818A2 (en) 2010-09-15
WO2009112658A2 (en) 2009-09-17
FR2926394A1 (en) 2009-07-17
US20100277268A1 (en) 2010-11-04
CN101911237A (en) 2010-12-08
CN101911237B (en) 2013-03-20
FR2926394B1 (en) 2010-01-22
WO2009112658A3 (en) 2009-11-05

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