EP1517346B1 - Perfectionnement concernant la régulation thermique pour un élement électrique chauffant - Google Patents

Perfectionnement concernant la régulation thermique pour un élement électrique chauffant Download PDF

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Publication number
EP1517346B1
EP1517346B1 EP04028228A EP04028228A EP1517346B1 EP 1517346 B1 EP1517346 B1 EP 1517346B1 EP 04028228 A EP04028228 A EP 04028228A EP 04028228 A EP04028228 A EP 04028228A EP 1517346 B1 EP1517346 B1 EP 1517346B1
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EP
European Patent Office
Prior art keywords
sensor
conductor
thermal sensor
contact
fusible material
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EP04028228A
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German (de)
English (en)
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EP1517346A1 (fr
Inventor
Robert Andrew O'neill
John Anthony Howarth
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Otter Controls Ltd
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Otter Controls Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/002—Thermally-actuated switches combined with protective means

Definitions

  • This invention concerns improvements relating to thermal controls for electric heating elements and particularly, though not exclusively, concerns the arrangements that are disclosed in our British Patent Applications Nos. 9717144.1 filed 12 August 1997 and 9724382.8 filed 18 November 1997.
  • the contactstat thermal sensor comprises a dished disk bimetal which moves with a snap-action between oppositely dished configurations when the sensed temperature rises above a predetermined level, the bimetal movement being transferred by means of a push-rod to a pair of switch contacts.
  • the contactstat thermal sensor described in our British Patent Application No. 9724382.8 provides only a primary level of thermal protection, namely it has no facility for provision of a secondary or back-up level of protection to be operative in the vent, however unlikely, of failure of the primary protection, for example due to failure of the bimetal or welding together of the switch contacts.
  • EP 0014102 discloses a thermostat for insertion into a power supply line by means of terminals.
  • a switch including contacts and a flexible member which can flex about a fulcrum point is actuated according to ambient temperature, by means of a bimetallic disk acting through a pushrod.
  • features 24 and 26 are held in contact with each other by a further pushrod which is supported on a fusible block, in turn supported on a metal plate.
  • block melts, removing the support from pushrod, and this enables a spring to push the resilient element downwards so that it parts from the inner end of terminal 15 at 24, 26.
  • a contact thermal sensor comprising a sprung electrical conductor serving at opposite ends thereof as the moving contacts of first and second sets of switch contacts which, in use, are held in closed condition against the bias of said sprung electrical conductor, the first set of switch contacts being arranged to be held in closed condition by a bimetallic switch actuator which is adapted to allow the first contacts to open at a predetermined temperature, and the second set of switch contacts being arranged to be held in closed condition by a member of fusible material which is adapted to allow the second contacts to open at a temperature above the operating temperature of the bimetallic switch actuator, the arrangement being such that, in use of the sensor, in the event of failure of the bimetallic switch actuator to open the first set of switch contacts the second set of switch contacts can be opened in response to melting of said member of fusible material.
  • the primary switch contacts are comprised by a fixed contact and a movable contact at one end of a spring metal beam and the other end of the beam is held in electrical contact with an electrical terminal part of the contactstat by means of a rod formed of fusible thermoplastics materials, the beam being stressed over an abutment when the primary switch contacts are closed at one end of the beam and the other end contacts the electrical terminal part.
  • the push rod allows the said one end of the beam to resile from the fixed contact of the device and, if this fails to happen and the contacts at the said one end of the beam remain closed, the increasing temperature will cause the thermoplastics rod to soften thereby allowing the said other end of the beam to resile from the electrical terminal part.
  • the contactstat thermal sensor shown therein comprises an auto-resetting dished disk bimetal 1, a push-rod 2 and a pair of switch contacts 3 and 4, the contact 3 constituting the moving contact of the switch contacts and being affixed to one end of a spring-metal beam 5, and the contact 4 constituting the fixed contact of the switch and being affixed to a pressed metal terminal part 6 of the device.
  • a body part 7 of the contactstat is formed of a temperature resistant plastics or ceramics material and has a bore 8 which serves to accommodate the push-rod 2.
  • the disk bimetal 1 is accommodated on top of the body part 7 within a pressed metal cap 9, formed of copper or aluminium for example, which is adapted to be clenched onto the upper end of the body part 7.
  • the bimetal 1 sits under the cap 9 with its edge resting on the upper end of the push-rod 2 on one side of the bimetal disk and on a small projection 10 on the diametrically-opposite side of the disk.
  • a central depression 11 in the centre of the cap 9 provides an abutment with the bimetallic disk 1 and can be adjusted by deformation of the cap to adjust the bimetal operation.
  • a second body part 12 of the contactstat is adapted to fit together with the first-mentioned body part 7 so as to capture the beam 5, the terminal part 6 and a further terminal part 13 between the two body parts.
  • the two terminal parts 6 and 13 have portions 14 and 15 respectively which, when the two body parts 7 and 12 are fitted together, extend outside of the contactstat body for making spring contact with terminal pads provided on a thick film heating element the temperature of which is to be controlled by the contactstat.
  • the cap 9 has a radial extension 16 which is designed to accommodate the upper end of a rod 17 of fusible material, a thermoplastics material for example, and an opening 18 is formed in the body part 7 for admitting the lower end of the rod 17 to the internal chamber that is defined when the body parts 7 and 12 are fitted together.
  • the lower end of the rod 17 abuts the end of spring-metal beam 5 opposite to the end which carries the moving switch contact 3, the beam 5 being upturned at the respective end 19 for ensuring positive location of the rod 17 with the respective beam end 19 and ensuring that only axial forces are exerted on the rod 17.
  • Locating lugs 20 are provided on the elongate edges of the beam 5 and co-operate with formations 21 provided in the body parts 7 and 12 to locate the beam appropriately when the contactstat is being assembled.
  • An upstand 22 on the body part 12 is provided for applying an upwards thrust at an appropriate time (as described hereinafter) to the beam 5 at a location closer to the end 19 thereof than to the other end which carries the moving contact 3 of the switch.
  • the movement of the bimetal would normally allow the moving contact 3 to spring away from the fixed contact 4 without disrupting the contact established between the other end 19 of the beam 5 and the formation 23 on terminal part 13.
  • the fusible rod 17 will soften or melt and the end 19 of the beam 5 will resile out of electrical contact with the formation 23 provided on terminal part 13. The fusible rod 17 thus provides a secondary or back-up protection level which is operative in the event that the primary protection provided by the bimetal 1 fails.
  • a formation 24 is provided on the lower body part 12 to enable the contactstat to be assembled with a carrier as described in our British Patent Application No. 9717144.1 abovementioned.
  • the upstand 22 may or may not, but need not, contact the beam 5 in the cold condition of the contactstat as shown in Figure 2, since in this condition the action of the fusible rod 17 on the end 19 of the beam 5 and the abutment of the beam 5 with the formation 23 upstanding from terminal part 13 will serve to stress the beam sufficiently to ensure proper operation of the primary contacts 3, 4.
  • the rod 17 softens or melts in the secondary protection mode of the contactstat and the beam begins to resile towards its normal flat condition, thereby breaking electrical contact between the end 19 of the beam and the formation 23, only the contact of the beam with the upstand 22 will give rise to a continuing force such that the beam 5 continues to resile and opens a safe electrical gap between the beam and the terminal part 13.
  • the upstand 22 does not contact the beam 5 in the cold condition of the contactstat, the forces between the end 19 of the beam and the formation 23 on the terminal part 13 will be optimized so that silver plating of these parts for better electrical contact may not be necessary.
  • the geometry of the described and illustrated arrangement is such that, in the cold condition of the contactstat, a high force is applied to the fusible rod 17 and a lower force is applied to the push-rod 2, reflecting the lower actuating force available from the bimetallic disk.
  • the advantage of this arrangement is that a very high force is available from a short, stiff spring, namely the part of beam 5 between formation 23 and beam end 19, to initiate deformation of the fusible rod 17 at the appropriate temperature.
  • the upstand 22 provides a lower force from a longer, more resilient spring, namely the part of beam 5 between formation 22 and beam end 19, to provide sufficient deformation of rod 17 to open a safe spacing between the beam 5 and the formation 23 on terminal part 13.
  • the fusible rod 17 is preferably formed of an electrically insulating thermoplastics material, since it is in contact with the current carrying beam 5, it could be formed of a suitable eutectic metal alloy material provided with an electrically-insulating cap. Furthermore, the fusible material rod 17 could be arranged such that, in use of the contactstat, the upper end of the rod 17 directly abuts the heating element rather than being captured within the cap extension 16.
  • the beam 5 would not be stressed in the free-standing condition of the contactstat, namely before it was fitted to a heating element, and would only be stressed when the contactstat was assembled with the heating element, such assembly causing the rod 17 to be driven axially inwardly of the contactstat so as to bend the end 19 of the beam 5 over the upstand 23 on terminal part 13.
  • the embodiment also includes a contact thermal sensor comprising a bimetallic actuator in the form of a dished disk bimetal which is movable with a snap action between oppositely dished configurations, the bimetallic actuator being arranged to operate a set of switch contacts in normal operation of the sensor, and wherein a member comprising fusible material is arranged to disrupt an electrical path through the sensor in the event that the primary protection afforded by the bimetal and the switch contacts fails to operate and the fusible material is subjected to a temperature above the normal operating temperature of the bimetal, characterized in that the set of switch contacts is arranged to be operated by means of a push rod responsive to movement of the periphery of the bimetal as it snaps between its oppositely dished configurations, the push rod co operating with one end of an elongate spring member which extends over an abutment serving to stress the spring member and at its other end co operates with said member comprising fusible material for determining the condition of said electrical path.
  • the senor comprises a sensor body provided with a thermally conductive metal cap, and the bimetal is captured between the cap and the sensor body, the cap being formed to define an abutment defining the position of the centre of the bimetal.
  • the cap is deformable for adjusting the position of said abutment.
  • the member comprises fusible material comprises a push rod which co operates with said other end of said elongate spring member to determine whether or not electrical contact is established between said elongate spring member and a conductor of the sensor.
  • the fusible material push rod operates to bend the spring member over an upstanding part of the said conductor.
  • the upstanding part of said conductor is closer to said other end of said spring member than to said one end thereof.
  • an upstand is provided in a body part of the sensor, said upstand serving as an abutment for interaction with said spring member in the disruption of said electrical path.
  • the member comprising fusible material is located outside of the periphery of said bimetal.
  • the embodiment provides a contact thermal sensor comprising a bimetallic actuator 1,2 arranged to operate a set of switch contacts in normal operation of the sensor, and wherein a member 17 comprising fusible material is arranged to disrupt an electrical path through the sensor in the event that the primary protection afforded by the bimetal 1 and the switch contacts fails to operate and the fusible material is subjected to a temperature above the normal operating temperature of the bimetal.
  • the bimetallic actuator preferably comprises a dished disk bimetal 1 which is movable with a snap action between oppositely dished configurations.
  • the set of switch contacts are arranged to be operated by means of a push rod 2 responsive to movement of the periphery of the bimetal 1 as it snaps between its oppositely dished configurations.
  • the senor comprises a sensor body 7 provided with a thermally conductive metal cap 9, and the bimetal 1 is captured between the cap and the sensor body, the cap being formed to define an abutment 11 defining the position of the centre of the bimetal.
  • the cap 9 is deformable for adjusting the position of said abutment 11.
  • the member 17 comprising fusible material comprises a push rod which serves to maintain electrical contact between a spring member 5 and a conductor 13 of the sensor.
  • the fusible material push rod 17 operates to bend the spring member 5 over an upstanding part 23 of the said conductor 13.
  • said spring member 5 is elongate and at one end thereof serves as the moving contact of the set of switch contacts associated with the bimetal 1 and at the opposite end thereof serves in co-operation with said fusible material rod 17.
  • the upstanding part 23 of said conductor 13 is closer to said opposite end of said spring member 5 than to said one end thereof.
  • an upstand 22 is provided in a body part of the sensor, said upstand serving as an abutment for interaction with said spring member 5 in the disruption of said electrical path.
  • the embodiment also provides a contact thermal sensor comprising a sprung electrical conductor 5 serving at opposite ends thereof as the moving contacts of first and second sets of switch contacts which are normally held in closed condition against the bias of said sprung electrical conductor, the first set of switch contacts being arranged to be held in closed condition by a bimetallic switch actuator 1,2 which is adapted to allow the first contacts to open at a predetermined temperature, and the second set of switch contacts being arranged to be held in closed condition by a member 17 of fusible material which is adapted to allow the second contacts to open at a temperature above the operating temperature of the bimetallic switch actuator, the arrangement being such that, in use of the sensor, in the event of failure of the bimetallic switch actuator to open the first set of switch contacts the second set of switch contacts can be opened in response to melting of said member of fusible material.
  • the electrical conductor is formed of spring metal and, in the cold condition of the sensor wherein both sets of contacts are closed, is bent over an abutment 23 by the action of the bimetallic switch actuator 1,2 at one end and the action of the member 17 of fusible material at an opposite end, the bending of the spring metal conductor providing the necessary spring force for operation of the two sets of switch contacts.

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  • Thermally Actuated Switches (AREA)

Claims (20)

  1. Capteur thermique à contact comprenant un conducteur électrique à ressort (5) servant à ses extrémités opposées de contacts mobiles de premier et deuxième ensembles de contacts de commutation qui, en utilisation, sont maintenus dans un état fermé dans lequel ils s'opposent à la poussée exercée par ledit conducteur électrique à ressort, le premier ensemble de contacts de commutation étant agencé de façon à être maintenu à l'état fermé par un actionneur de commutation bimétallique (1, 2) qui permet l'ouverture des premiers contacts à une température prédéterminée, et le deuxième ensemble de contacts de commutation étant agencé de façon à être maintenu à l'état fermé par un élément (7) en matériau fusible qui permet l'ouverture des deuxièmes contacts à une température supérieure à la température de fonctionnement de l'actionneur de commutation bimétallique, l'arrangement étant tel que, lorsque le capteur est en utilisation et que l'actionneur de commutation bimétallique ne parvient pas à ouvrir le premier ensemble de contacts de commutation, le deuxième ensemble de contacts de commutation peut être ouvert en réponse à la fusion dudit élément en matériau fusible.
  2. Capteur thermique à contact selon la revendication 1, dans lequel ledit actionneur de commutation bimétallique comprend un disque de bimétal bombé (1) qui est mobile par une action d'encliquetage entre des configurations bombées opposées et un poussoir (2) sensible au mouvement de la périphérie du bimétal pour déterminer la position d'un contact mobile (3) dudit premier ensemble de contacts de commutation.
  3. Capteur thermique à contact selon la revendication 2, dans lequel l'élément (17) en matériau fusible est placé à l'extérieur de la périphérie dudit bimétal (1).
  4. Capteur thermique à contact selon la revendication 1, 2 ou 3, dans lequel le conducteur électrique (5) est formé à partir d'un métal pour ressort et, lorsque le capteur est dans un état froid dans lequel les deux ensembles de contacts sont fermés, le conducteur électrique est incurvé sur une butée (23) sous l'action de l'actionneur de commutation bimétallique à une extrémité et sous l'action de l'élément en matériau fusible à une extrémité opposée, l'incurvation du conducteur en métal pour ressort exerçant la tension de ressort nécessaire pour commander les deux ensembles de contacts de commutation.
  5. Capteur thermique à contact selon la revendication 1, dans lequel ledit conducteur électrique à ressort comprend un conducteur électrique allongé (5) en métal pour ressort dont une extrémité comprend un premier contact mobile (3) qui est maintenu, de façon à s'opposer à la poussée élastique exercée par ledit conducteur en contact avec un premier contact fixe (4), par l'actionneur de commutation bimétallique (1, 2) qui est mobile de façon à permettre l'ouverture des premiers contacts à une température prédéterminée lorsque le conducteur se détend à la suite du mouvement de l'actionneur bimétallique, et dont l'autre extrémité (19) comprend un deuxième contact mobile qui est maintenu, de façon à s'opposer à la tension de ressort exercée par ledit conducteur en contact avec un deuxième contact fixe (23), par l'élément (17) en matériau fusible qui est prévu pour se ramollir ou fondre à une température supérieure à la température de fonctionnement de l'actionneur de commutation bimétallique de manière à permettre au conducteur de se détendre et d'ouvrir les deuxièmes contacts, l'arrangement étant tel que, lorsque le capteur est en utilisation et que l'actionneur de commutation bimétallique ne parvient pas à ouvrir le premier ensemble de contacts de commutation, le deuxième ensemble de contacts de commutation peut être ouvert en réponse à la fusion dudit élément en matériau fusible.
  6. Capteur thermique à contact selon la revendication 5, dans lequel ledit conducteur électrique (5) en métal pour ressort est reçu à l'intérieur d'un corps de capteur (7), électriquement isolant, sans être fixé au audit corps, et l'action de l'actionneur de commutation bimétallique (1, 2) à ladite une extrémité dudit conducteur et de l'élément (17) en matériau fusible à ladite autre extrémité sert à contraindre le conducteur, au moins lorsque le capteur est en utilisation.
  7. Capteur thermique à contact selon la revendication 6, dans lequel l'action de l'actionneur de commutation bimétallique (1, 2) et de l'élément (17) en matériau fusible aux extrémités opposées du conducteur électrique (5) en métal pour ressort sert à incurver le conducteur sur une butée (23).
  8. Capteur thermique à contact selon la revendication 7, dans lequel l'arrangement est tel que la tension de ressort, qui est exercée par le conducteur électrique incurvé (5) en métal pour ressort pour s'opposer à l'élément en matériau fusible, est supérieure à la force exercée pour s'opposer à l'actionneur de commutation bimétallique.
  9. Capteur thermique à contact selon la revendication 8, dans lequel la différence entre la tension de ressort exercée par le conducteur électrique (5) en métal pour ressort pour s'opposer à l'actionneur de commutation bimétallique (1, 2) et celle qu'il exerce pour s'opposer à l'élément (17) en matériau fusible est obtenue en plaçant ladite butée (23) plus loin de ladite une extrémité du conducteur que de ladite autre extrémité de celui-ci.
  10. Capteur thermique à contact selon la revendication 7, 8 ou 9, dans lequel ladite butée (23) est constituée comme étant une partie dudit deuxième contact fixe.
  11. Capteur thermique à contact selon l'une quelconque des revendications 5 à 10, dans lequel l'élément en matériau fusible comprend un poussoir (17) agissant sur ladite autre extrémité dudit conducteur électrique (5) en métal pour ressort.
  12. Capteur thermique à contact selon la revendication 11, dans lequel ledit poussoir fusible (17) est agencé de telle sorte que, lorsque le capteur est utilisé avec un élément chauffant, une portion d'extrémité d'un poussoir bute directement contre l'élément chauffant et la juxtaposition du capteur et de l'élément chauffant provoque l'introduction du poussoir dans le capteur de manière à contraindre ledit conducteur électrique (5) en métal pour ressort.
  13. Capteur thermique à contact selon l'une quelconque des revendications 5 à 12, dans lequel un élément saillant (22) est placé dans une partie du corps du capteur, ledit élément saillant servant de butée pour l'interaction avec le conducteur électrique en métal pour ressort pendant l'ouverture dudit deuxième ensemble de contacts de commutation.
  14. Capteur thermique à contact selon la revendication 13, dans lequel l'arrangement est tel que ledit élément saillant (22) est espacé du conducteur électrique (5) en métal pour ressort lorsque le capteur est à l'état normal, et devient actif seulement en réponse à l'action dudit élément (17) en matériau fusible pour ouvrir ledit deuxième ensemble de contacts de commutation.
  15. Capteur thermique à contact selon l'une quelconque des revendications 5 à 14, dans lequel le capteur comprend une partie de corps de capteur (7) dotée d'un capuchon métallique (9) thermiquement conducteur, et un bimétal (1) de l'actionneur de commutation bimétallique est emprisonné entre le capuchon et la partie de corps de capteur, le capuchon étant formé de façon à définir une butée (1) avec l'actionneur de commutation bimétallique.
  16. Capteur thermique à contact selon la revendication 15, dans lequel le capuchon (9) est déformable de manière à régler la position de ladite butée (11) afin de régler le fonctionnement de l'actionneur bimétallique.
  17. Capteur thermique à contact selon la revendication 1, ledit capteur thermique comprenant une partie de corps (7) emprisonnant à l'intérieur des première et deuxième parties formant bornes électriques (16, 13) espacées l'une de l'autre, ledit conducteur électrique à ressort (5) reliant entre elles lesdites parties formant bornes électriques espacées l'une de l'autre, ledit conducteur électrique à ressort étant maintenu de façon à s'opposer à sa tension de ressort à une extrémité au moyen de l'actionneur de commutation bimétallique (1, 2) agissant par l'intermédiaire d'un poussoir (2) et à son autre extrémité au moyen de l'élément (17) en matériau fusible, l'arrangement étant tel que le fonctionnement de l'actionneur de commutation bimétallique (1, 2) à une température prédéterminée peut libérer ladite une extrémité de l'élément de pontage du contact électrique avec ladite première partie formant borne électrique (6) et, lorsqu'un tel mécanisme est en panne, la fusion dudit élément (17) en matériau fusible à une température supérieure à ladite température prédéterminée peut libérer l'autre extrémité de l'élément de pontage du contact électrique avec ladite deuxième partie formant borne électrique (13).
  18. Capteur thermique à contact selon la revendication 17, dans lequel le poussoir (2) fonctionnant à une extrémité de l'élément de pontage et l'élément (17) en matériau fusible fonctionnant à l'autre extrémité de l'élément de pontage incurve l'élément de pontage sur une butée (23) en s'opposant à sa propre élasticité.
  19. Capteur thermique à contact selon la revendication 18, dans lequel ladite butée (23) est constituée comme étant une partie de la deuxième pièce formant borne électrique (13).
  20. Capteur thermique à contact selon la revendication 18 ou 19, dans lequel ladite butée (23) n'est pas espacée uniformément entre les extrémités opposées de l'élément de pontage de sorte qu'un plus grande force élastique est exercée sur l'un des éléments parmi le poussoir (2) et l'élément (17) en matériau fusible que sur l'autre de ces éléments.
EP04028228A 1998-04-14 1999-04-14 Perfectionnement concernant la régulation thermique pour un élement électrique chauffant Expired - Lifetime EP1517346B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9807924 1998-04-14
GB9807924A GB2338110B (en) 1998-04-14 1998-04-14 Improvements relating to thermal controls for electric heating elements
EP99915934A EP1072048B1 (fr) 1998-04-14 1999-04-14 Ameliorations relatives aux commandes de temperature d'elements chauffants electriques

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP99915934A Division EP1072048B1 (fr) 1998-04-14 1999-04-14 Ameliorations relatives aux commandes de temperature d'elements chauffants electriques

Publications (2)

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EP1517346A1 EP1517346A1 (fr) 2005-03-23
EP1517346B1 true EP1517346B1 (fr) 2006-12-06

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EP99915934A Expired - Lifetime EP1072048B1 (fr) 1998-04-14 1999-04-14 Ameliorations relatives aux commandes de temperature d'elements chauffants electriques
EP04028228A Expired - Lifetime EP1517346B1 (fr) 1998-04-14 1999-04-14 Perfectionnement concernant la régulation thermique pour un élement électrique chauffant

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EP99915934A Expired - Lifetime EP1072048B1 (fr) 1998-04-14 1999-04-14 Ameliorations relatives aux commandes de temperature d'elements chauffants electriques

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EP (2) EP1072048B1 (fr)
CN (1) CN1134807C (fr)
AU (1) AU3435499A (fr)
DE (2) DE69928517T2 (fr)
GB (2) GB2338110B (fr)
HK (1) HK1038829A1 (fr)
WO (1) WO1999053513A1 (fr)

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GB2382465B (en) * 2001-11-14 2005-07-13 Otter Controls Ltd Improvements relating to thermally-responsive switches
CN1186703C (zh) * 2002-01-14 2005-01-26 邵志成 温控器、电连接器及电热水器具
CN100356652C (zh) * 2005-09-26 2007-12-19 常熟市天银机电有限公司 单相交流电机的过载保护器
DE102007017366B3 (de) * 2007-04-12 2008-09-18 Cherry Gmbh Elektrischer Schalter
CN102969199B (zh) * 2012-11-26 2015-01-28 佛山市天朋温控器有限公司 突跳式温控器
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EP0271345A3 (fr) * 1986-12-12 1988-09-07 Texas Instruments Incorporated Thermostat miniature ajustable avec protection intégrée de sur température
DE3735334A1 (de) * 1987-10-19 1989-04-27 Thermostat & Schaltgeraetebau Thermisch gesteuerte elektrische schalteinrichtung
GB8807563D0 (en) * 1988-03-30 1988-05-05 Strix Ltd Electric immersion heaters
FR2656952B1 (fr) * 1990-01-05 1995-04-14 Seb Sa Coupe-circuit integre a un thermostat pour appareil electrique.
GB9105111D0 (en) * 1991-03-11 1991-04-24 Otter Controls Ltd Improvements relating to thermally-responsive switches

Also Published As

Publication number Publication date
GB2373926B (en) 2002-11-13
GB9807924D0 (en) 1998-06-10
CN1304539A (zh) 2001-07-18
GB2373926A (en) 2002-10-02
DE69934338T2 (de) 2007-06-28
GB2338110A (en) 1999-12-08
GB0216281D0 (en) 2002-08-21
DE69928517D1 (de) 2005-12-29
EP1517346A1 (fr) 2005-03-23
GB2338110B (en) 2002-08-28
EP1072048A1 (fr) 2001-01-31
DE69934338D1 (de) 2007-01-18
WO1999053513A1 (fr) 1999-10-21
HK1038829A1 (zh) 2002-03-28
AU3435499A (en) 1999-11-01
CN1134807C (zh) 2004-01-14
DE69928517T2 (de) 2006-08-10
EP1072048B1 (fr) 2005-11-23

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