EP0206868A1 - Thermischer Sicherungsschalter - Google Patents

Thermischer Sicherungsschalter Download PDF

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Publication number
EP0206868A1
EP0206868A1 EP86401127A EP86401127A EP0206868A1 EP 0206868 A1 EP0206868 A1 EP 0206868A1 EP 86401127 A EP86401127 A EP 86401127A EP 86401127 A EP86401127 A EP 86401127A EP 0206868 A1 EP0206868 A1 EP 0206868A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
heat
terminals
thermal circuit
movable member
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.)
Withdrawn
Application number
EP86401127A
Other languages
English (en)
French (fr)
Inventor
Pierre Schwob
Daniel Bontoux
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
Publication of EP0206868A1 publication Critical patent/EP0206868A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01H37/764—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet
    • H01H37/766—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet using a bridging contact
    • 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
    • H01H2037/768—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material characterised by the composition of the fusible material

Definitions

  • the present invention relates to a thermal circuit breaker and more particularly a thermal circuit breaker at a predetermined temperature to ensure the protection of electric household appliances, in particular irons.
  • This type of circuit breaker is not intended to act as a temperature regulation device for the household appliance in which it is mounted, but only to act as safety in the event that the regulation system has not worked and where the household appliance is therefore subjected to an abnormal rise in temperature.
  • the circuit breaker To perform its function, the circuit breaker must operate as soon as an unusual temperature is reached and before the device to be protected is damaged. For this it is necessary to ensure good thermal transmission between the heating element to be checked and the circuit breaker.
  • the circuit breaker is preferably in direct contact with the heating element to be checked.
  • the space available to put the circuit breaker in contact with the heating element is low due to the various accessories which surround the heating element and are necessary for the operation of the household appliance.
  • the heating element consists of the soleplate of the iron, a large part of which is made unavailable by the presence of the heating resistor, of the zone of formation of steam and of the contact zone with the regulating means.
  • circuit breaker be as miniaturized as possible.
  • circuit breaker In addition, and taking into account the cost imperatives, it is necessary that the structure of the circuit breaker is compatible with very large series mounting operations. fast especially by means of automatic machines.
  • British patent application 2 005 477 describes a rechargeable thermal circuit breaker with rotary contacts of relatively complex structure which is not compatible with very simple series mounting operations.
  • An object of the present invention is to provide a thermal circuit breaker which, while being sufficiently sensitive and miniaturized, keeps the household appliance on which it is mounted in service as long as the temperature of this appliance is not abnormal.
  • a thermal circuit breaker comprising a housing comprising at least one part of the housing which conducts heat, two terminals carried by an electrically insulating plug, and a movable element which conducts the electricity maintained in contact with each of the terminals by a part deformable by heat, itself in contact with the part of the housing which conducts heat, characterized in that it comprises a movable electrically insulating member, movable in translation, disposed between the movable element and the part deformable by heat, this movable member forming a separation between the part deformable by heat on the one hand and the terminals and the electrically conductive element on the other hand.
  • the heat-deformable part is without drawback produced in the form of a conductive pad, for example of a metal alloy having a precise melting temperature higher than the normal temperature of use of the device on which the circuit breaker is mounted and does not sublime at temperatures below the normal temperature for use.
  • the movable member forms a partition preventing the molten material from going up towards the terminals and from restoring the interrupted electrical circuit or from creating a grounding of the device.
  • the heat-deformable part is a fusible pad and the movable member comprises a punch part extending towards the fusible pad.
  • the part of the heat conducting casing comprises an annular partition extending towards the movable member and surrounding the fusible pad.
  • the volume of the wafer is reduced to the volume delimited by the annular partition and a thermal circuit breaker having a very low inertia is produced.
  • the plug has a peripheral groove and the housing is crimped in this groove.
  • the circuit breaker comprises a housing generally designated at 1 comprising a cylindrical side wall 2 and a bottom 3.
  • the housing 1 is made of a heat conductive material 1 and preferably in a single operation, for example by creep of a aluminum pellet.
  • the housing 1 is closed by a plug 4 crossed by electrical terminals 5 arranged side by side.
  • the plug 4 is made of an electrically insulating material, for example ceramic, and the terminals 5 are therefore electrically insulated from the case 1 which conducts heat.
  • the terminals 5 open on the one hand towards the outside of the circuit breaker where they can be connected to the electrical circuit of the heating appliance for which it is desired to ensure safety, and on the other hand towards the inside where they are electrically connected by an electrically conductive movable element 6 held in contact with each of the terminals 5 by an insulating movable member 7 supported by a part 8 deformable by heat in contact with the bottom 3 of the housing.
  • the part 8 which can be deformed by heat is for example a fusible disc made of a metal alloy based on lead, tin and bismuth.
  • the movable conductive element 6 is a metal plate in the form of a cup disposed opposite the terminals 5 and on which springs 9 and 10 act in an antagonistic manner, the spring 9 being disposed at- above the cup 6 and the spring 10 below the cup 6.
  • the cup 6 has a rim 11 and a bottom 12 connected by a side wall.
  • the spring 10 is a cylindrical helical spring with a diameter substantially equal to that of the flange 11 and the spring 9 is a cylindrical helical spring whose diameter is close to the diameter of the disc 12 forming the bottom of the cup so that, during assembly, the springs 9 and 10 and the cup 6 are automatically centered with respect to each other.
  • the spring 10 is dimensioned to exert, when compressed, a force greater than that of the spring 9 and thus maintain the flange 11 against the terminals 5 in order to close the electrical circuit between these terminals.
  • the movable member 7 also made of insulating material, for example ceramic, has at its lower part a punch part 13 extending towards the deformable pad 8.
  • the bottom 3 of the housing 1 has an annular partition 14 extending towards the movable member 7 and surrounding the deformable patch 8.
  • the plug 4 also includes a peripheral groove 15 located at a distance d from the upper face of the plug 4.
  • the circuit breaker assembly according to the invention is preferably carried out upside down, that is to say that the plug 4 is placed on a reference surface, then the spring 9, the cup 6 are successively stacked, the spring 10, the movable member 7 and the housing 1 in which the pad 8 has been previously put in place. It can then be seen that the case 1 engages more or less on the plug 4 as a function of the height of the movable member 7 and of the thickness of the pad 8 which varies a little according to manufacturing tolerances. An automatic crimping can nevertheless be easily carried out, the only constraint for this operation being the constancy of the distance d between the external face of the plug 4 and the groove 15.
  • the parts are in the position shown on the left half of Figure 1, that is to say that the cup 6 provides electrical contact between the terminals 5, these being also isolated from the housing by the plug 4 and the movable member 7.
  • the terminals 5 are arranged in a cavity 16 of the plug 4 and the movable member 7 comprises a cavity 17 opposite the cavity 16, a surface portion 18 of the member mobile 7 being in contact with the plug 4.
  • the circuit breaker can be arranged without damage in a highly charged atmosphere, for example near the steam formation chamber of an electric iron.
  • the chip 8 melts and the movable member 7 sinks into the molten material under the action of the springs 9 and 10.
  • the spring 10 expands until the force exerted by it on the cup 6 becomes less to the force exerted by the spring 9, which then separates the cup 6 from the terminals 5 and opens the electrical circuit between these terminals.
  • the molten material of the pellet 8 can flow freely in the cavity 19 surrounding the lower part of the movable member 7.
  • the movable member 7 may present with the side wall of the housing 1 a clearance 20 which, in the case of a conductive fusible material, must however be sufficiently weak to create a flow resistance preventing the conductive fusible material from flowing to the terminals 5 and to restore the electrical circuit between that -this.
  • FIG. 2 illustrates a second embodiment of the circuit breaker according to the invention.
  • the circuit breaker comprises a box 1 comprising a side wall 2 and a bottom 3, and closed by a plug 4 in which are arranged terminals 5 passing through the plug 4.
  • the element mobile conductor 6 is this time a helical spring of which at least one turn 6a has a diameter different from the others and is arranged with respect to the terminals 5 to be in contact with the latter before the pellet 8 heats up and is spaced apart from minus one of them when this pellet heats up.
  • the spring 6 is substantially frustoconical in the rest position.
  • the helical spring 6 has its end of larger diameter facing the plug 4 and inserted into an annular groove 21 made on the underside of the plug 4, and its end of small diameter resting on the surface upper part of the movable member 7 and kept centered on it by a circular shoulder 22.
  • the circuit breaker is mounted in a cylindrical cavity 23 of a sole 24 of an iron and is held in place in this cavity by a washer 25 fixed to the upper part of the sole 24 by a pin 26 formed on the upper surface of the sole 24 nearby of the cavity 23 and whose head is crushed on the washer 25, so that the edge of the washer 25 overhangs the upper part of the circuit breaker and thus keeps the bottom 3 of the housing 1 in contact with the bottom of the cavity 23 .
  • the movable member 7 also includes an annular wall part 27 surrounding the lower part of the plug.
  • the wall part 27 forms, with the opposite part of the plug 4, a baffle which additionally prevents the molten fuse material from rising up towards the terminals 5.
  • FIG. 3 illustrates a third embodiment comprising, as in the first embodiment, a movable conductive element 6 formed by a metal plate urged in the direction of opening of the contact by a helical spring 9.
  • the metal plate 6 is directly supported by the movable member 7 and the spring-10 antagonistic to the spring 9 is disposed below the movable member 7.
  • the spring 10 relaxes in the melted fusible material and causes a small displacement. of this molten material which thus remains completely contained in the annular wall 14.
  • the pellet 8 which can be deformed by heat can be replaced by a bimetallic strip or a metal coil with shape memory.
  • the seal between the plug 4 and the housing 1 can be obtained by using a plug made of slightly deformable organic material forced into the housing at the time of assembly.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Thermally Actuated Switches (AREA)
EP86401127A 1985-06-14 1986-05-28 Thermischer Sicherungsschalter Withdrawn EP0206868A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8509030 1985-06-14
FR8509030A FR2583568A1 (fr) 1985-06-14 1985-06-14 Coupe-circuit thermique.

Publications (1)

Publication Number Publication Date
EP0206868A1 true EP0206868A1 (de) 1986-12-30

Family

ID=9320243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401127A Withdrawn EP0206868A1 (de) 1985-06-14 1986-05-28 Thermischer Sicherungsschalter

Country Status (6)

Country Link
US (1) US4673909A (de)
EP (1) EP0206868A1 (de)
JP (1) JPS61288334A (de)
CA (1) CA1247173A (de)
ES (1) ES8708092A1 (de)
FR (1) FR2583568A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995022159A1 (de) * 1994-02-10 1995-08-17 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische sicherung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2993933B1 (ja) * 1998-06-23 1999-12-27 東洋システム株式会社 温度ヒューズ機能付き導電接触ピン
US5982270A (en) * 1998-12-03 1999-11-09 Shop Vac Corporation Thermal fuse
JP4499680B2 (ja) * 2005-03-30 2010-07-07 三星エスディアイ株式会社 円筒形リチウムイオン二次電池
KR100696783B1 (ko) * 2005-05-03 2007-03-19 삼성에스디아이 주식회사 원통형 리튬 이차전지
DE102005060965B4 (de) * 2005-06-28 2007-08-16 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische Sicherung mit Verfahren zu ihrer Herstellung
DE102006040661A1 (de) * 2006-08-30 2008-03-13 Robert Bosch Gmbh Strom-Überlastschutz eines Bürstenapparates

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB963064A (en) * 1960-09-13 1964-07-08 Filtron Company Inc Improvements in or relating to thermally responsive circuit breakers
GB2005477A (en) * 1977-10-08 1979-04-19 Nifco Inc Resettable thermal cut-off fuse
FR2428908A1 (fr) * 1978-06-15 1980-01-11 Inter Control Koehler Hermann Coupe-circuit thermique a materiau fusible
US4186366A (en) * 1978-10-20 1980-01-29 Illinois Tool Works Inc. Radial lead thermal cut-off device
US4383236A (en) * 1981-12-28 1983-05-10 Mcgraw-Edison Company Heat limiters and method of manufacture
US4408178A (en) * 1982-07-12 1983-10-04 The Singer Company Thermostatic switch

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291945A (en) * 1965-03-04 1966-12-13 Micro Devices Corp Thermal switch having temperature sensitive pellet and movable contact
JPS5535807B2 (de) * 1972-03-09 1980-09-17
US4126845A (en) * 1976-04-15 1978-11-21 Matsushita Electric Industrial Co., Ltd. Temperature responsive current interrupter
US4145654A (en) * 1977-07-21 1979-03-20 Minnesota Mining And Manufacturing Company Thermal switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB963064A (en) * 1960-09-13 1964-07-08 Filtron Company Inc Improvements in or relating to thermally responsive circuit breakers
GB2005477A (en) * 1977-10-08 1979-04-19 Nifco Inc Resettable thermal cut-off fuse
FR2428908A1 (fr) * 1978-06-15 1980-01-11 Inter Control Koehler Hermann Coupe-circuit thermique a materiau fusible
US4186366A (en) * 1978-10-20 1980-01-29 Illinois Tool Works Inc. Radial lead thermal cut-off device
US4383236A (en) * 1981-12-28 1983-05-10 Mcgraw-Edison Company Heat limiters and method of manufacture
US4408178A (en) * 1982-07-12 1983-10-04 The Singer Company Thermostatic switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995022159A1 (de) * 1994-02-10 1995-08-17 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische sicherung

Also Published As

Publication number Publication date
FR2583568A1 (fr) 1986-12-19
JPS61288334A (ja) 1986-12-18
CA1247173A (en) 1988-12-20
US4673909A (en) 1987-06-16
ES8708092A1 (es) 1987-09-01
ES556021A0 (es) 1987-09-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19890922

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Inventor name: SCHWOB, PIERRE

Inventor name: BONTOUX, DANIEL