EP0121005A1 - Thermische Schmelzsicherung - Google Patents

Thermische Schmelzsicherung Download PDF

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Publication number
EP0121005A1
EP0121005A1 EP83201358A EP83201358A EP0121005A1 EP 0121005 A1 EP0121005 A1 EP 0121005A1 EP 83201358 A EP83201358 A EP 83201358A EP 83201358 A EP83201358 A EP 83201358A EP 0121005 A1 EP0121005 A1 EP 0121005A1
Authority
EP
European Patent Office
Prior art keywords
lead wires
fusible alloy
coil spring
lead wire
thermal fuse
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Withdrawn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
EP83201358A
Other languages
English (en)
French (fr)
Inventor
Tasuku Okazaki
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0121005A1 publication Critical patent/EP0121005A1/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Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to thermal fuses or temperature responsive circuit breakers having high current-carrying capacity and a high fusing temperature.
  • thermal fuses of high fusing temperature type are available in two kinds, namely, one uses an organic substance in its temperature sensing region and the other uses an inorganic substance in the same region.
  • the former using an organic substance is kept in a hermetically sealed metallic case so as to avoid erroneous motion caused by decomposition, degradation and decrease of volume of temperature sensing substances due to high temperature.
  • Thermal fuses of this type have disadvantage in that when they are used on cyclical and continuous basis under the condition of ambient temperatures ranging from a normal temperature to 200°C, hermetical sealing becomes lost due to the difference in thermal expansion and thermal shrinking between materials of composing parts. This loss of hermetical sealing often causes erroneous motion of a thermal fuse.
  • the conventional thermal fuse of high temperature type is 250°C at the highest in fusing temperature.
  • the present invention has for its object to provide a thermal fuse having current-carrying capacity of 15 - 20A and voltage of 250V which works accurately at a fusing temperature within the range from 250 o C to 300°C.
  • a thermal fuse according to the present invention comprises two lead wires having a head and a flange (or a pin), one having a longer head and the other having a shorter head, opposite each other with a required space therebetween and an element which bridges the opposing two lead wires. Both end surfaces of the element and each lead wire are welded together by fusible alloy at their contact surface and a coil spring under tension is set between the lead wire on one side and the element. With this arrangement, upon fusing of fusible alloy due to the rise of ambient temperature, the element is moved towards one of the two lead wires by the coil spring, with the result that a circuit is opened.
  • each lead wire carries a flange (or.a pin) 1a, 2a at the outer circumference of the end portion thereof but the length between the flange 1a and an extreme end of the lead wire 1 or the length of a head portion lb is made longer than the length between the flange 2a and an extreme end of the lead wire 2 or the length of a head portion 2b so that a cylindrical element 3 to be explained later can be put on the head portion 1b.
  • the cylindrical and electrically conductive element 3 bridges the lead wire 1 and the lead wire 2.
  • Fusible alloy 4 and fusible alloy 5 are of the same fusing temperature, but use of fusible alloy 5 is small in quantity because one end of the element 3 is close to the flange 2a and use of fusible alloy 4 is much in quantity because the length between one end of the element 3 and the flange 1a is long.
  • a coil spring 6 is set between the element 3 and the lead wire 1.
  • One end of the coil spring 6 is hitched to the flange la and the other end is hitched to a part of the element 3.
  • the coil spring 6 should be engaged with and supported by the element 3 and the lead wire 1 in the tensioned state.
  • the tractive power of the coil spring should be such that it does not destroy the deposition power by fusible alloy before fusing.
  • a thermal fuse of high temperature type as mentioned above is used by connecting it to an electric circuit of an electric appliance. If current value larger than a predetermined load current (15 - 20A, for example) is reached and Joule heat generated exceeds the fusing temperature of fusible alloy or the ambient temperature reaches the level of a predetermined fusible alloy fusing temperature, fusible alloy at 4 and fusible alloy at 5 fuse at the same time or fusible alloy 5 at the lead wire 2 in a smaller quantity fuses a little earlier and upon fusing of fusible alloy 4 on the side of the lead wire 1, the element is moved abruptly towards the side of the lead wire 1 by the tractive power of the coil spring 6, as shown in Fig. 2, and an electric circuit is opened.
  • a predetermined load current 15 - 20A, for example
  • two lead wires each having a head and a flange, are opposed to each other, an element is bridged between the opposing two lead wires.
  • an element is bridged between the opposing two lead wires.
  • fusible alloy which fuses at a predetermined temperature
  • use of fusible alloy which is high in specific resistance is limited to the minimum quantity necessary for welding together the element and the lead wire which are low in resistance and therefore a thermal fuse of high load characteristic can be obtained.
  • the element is bridged in such a fashion that it is biassed to one of the two lead wires by the coil spring under stress, erroneous motion by the coil spring can be prevented.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
EP83201358A 1983-03-30 1983-09-23 Thermische Schmelzsicherung Withdrawn EP0121005A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56269/83 1983-03-30
JP5626983A JPS59180924A (ja) 1983-03-30 1983-03-30 温度ヒユ−ズ

Publications (1)

Publication Number Publication Date
EP0121005A1 true EP0121005A1 (de) 1984-10-10

Family

ID=13022363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201358A Withdrawn EP0121005A1 (de) 1983-03-30 1983-09-23 Thermische Schmelzsicherung

Country Status (2)

Country Link
EP (1) EP0121005A1 (de)
JP (1) JPS59180924A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4424821A1 (de) * 1994-03-18 1995-09-21 Inter Control Koehler Hermann Doppeltemperatursicherung
DE19528100A1 (de) * 1995-08-01 1997-02-06 Inter Control Koehler Hermann Thermische Sicherung
CN1043494C (zh) * 1994-03-18 1999-05-26 英特尔控制赫尔曼科勒电气有限公司及两合公司 双重热保险装置
US5982270A (en) * 1998-12-03 1999-11-09 Shop Vac Corporation Thermal fuse
EP3644457A1 (de) * 2018-10-24 2020-04-29 Günther Spelsberg GmbH & Co. KG Elektrische verbindungsvorrichtung mit sicherungselement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06272831A (ja) * 1993-03-16 1994-09-27 Eiko Ono 焼却熔解炉

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1557911A (en) * 1976-04-15 1979-12-19 Matsushita Electric Ind Co Ltd Tamperature responsive current interrupter
US4356469A (en) * 1980-11-20 1982-10-26 Hilliard Dozier Electrical terminal with thermal interrupter
US4383236A (en) * 1981-12-28 1983-05-10 Mcgraw-Edison Company Heat limiters and method of manufacture

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57121119A (en) * 1981-01-19 1982-07-28 Matsushita Electric Ind Co Ltd Temperature fuse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1557911A (en) * 1976-04-15 1979-12-19 Matsushita Electric Ind Co Ltd Tamperature responsive current interrupter
US4356469A (en) * 1980-11-20 1982-10-26 Hilliard Dozier Electrical terminal with thermal interrupter
US4383236A (en) * 1981-12-28 1983-05-10 Mcgraw-Edison Company Heat limiters and method of manufacture

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4424821A1 (de) * 1994-03-18 1995-09-21 Inter Control Koehler Hermann Doppeltemperatursicherung
CN1043494C (zh) * 1994-03-18 1999-05-26 英特尔控制赫尔曼科勒电气有限公司及两合公司 双重热保险装置
DE19528100A1 (de) * 1995-08-01 1997-02-06 Inter Control Koehler Hermann Thermische Sicherung
WO1997005636A1 (de) * 1995-08-01 1997-02-13 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Thermische sicherung
DE19528100C2 (de) * 1995-08-01 1998-03-26 Inter Control Koehler Hermann Thermische Sicherung
US5982270A (en) * 1998-12-03 1999-11-09 Shop Vac Corporation Thermal fuse
FR2786924A1 (fr) * 1998-12-03 2000-06-09 Shop Vac Corp Fusible thermique
EP3644457A1 (de) * 2018-10-24 2020-04-29 Günther Spelsberg GmbH & Co. KG Elektrische verbindungsvorrichtung mit sicherungselement

Also Published As

Publication number Publication date
JPH0313693B2 (de) 1991-02-25
JPS59180924A (ja) 1984-10-15

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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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AK Designated contracting states

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Effective date: 19850228

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Effective date: 19860204

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18D Application deemed to be withdrawn

Effective date: 19860617