EP0696811A1 - Verbesserte Sicherung eingebaut im Thermostaten eines Haushaltsgerätes - Google Patents

Verbesserte Sicherung eingebaut im Thermostaten eines Haushaltsgerätes Download PDF

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Publication number
EP0696811A1
EP0696811A1 EP95500119A EP95500119A EP0696811A1 EP 0696811 A1 EP0696811 A1 EP 0696811A1 EP 95500119 A EP95500119 A EP 95500119A EP 95500119 A EP95500119 A EP 95500119A EP 0696811 A1 EP0696811 A1 EP 0696811A1
Authority
EP
European Patent Office
Prior art keywords
terminal
thermostat
strip
box
fitted
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.)
Granted
Application number
EP95500119A
Other languages
English (en)
French (fr)
Other versions
EP0696811B1 (de
Inventor
Ignacio Ormaechea Laborda
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.)
Oficina de Investigacion Agrupada SA
Officina De Investigacion Agrupada SA
Original Assignee
Oficina de Investigacion Agrupada SA
Officina De Investigacion Agrupada 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 Oficina de Investigacion Agrupada SA, Officina De Investigacion Agrupada SA filed Critical Oficina de Investigacion Agrupada SA
Publication of EP0696811A1 publication Critical patent/EP0696811A1/de
Application granted granted Critical
Publication of EP0696811B1 publication Critical patent/EP0696811B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H37/002—Thermally-actuated switches combined with protective means
    • 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

  • the present invention relates to a safety fuse for home electrical appliances of all kinds, fitted at one of the available thermostat terminals in order that when the thermostat stops working properly, either because the connections are welded together or the bimetallic strip is deformed or otherwise whatsoever, and the temperature of the appliance rises alarmingly, the conductor joined to the thermostat through the fuse will be broken off by fusion of the latter.
  • such device In home electrical and appliances of any other kind whatsoever which require a safety thermal device, such device usually comprises a fuse mounted independently of the thermostat, i.e. connected to a terminal other than the thermostat terminals.
  • One such device which is the least used and known as the minimet, is mounted inside an insulating ceramic box having a fixing plate.
  • Devices of this kind work well but their high cost renders them rather unsuitable to be used in small appliances in which the end prices and hence profit margins are not very high.
  • the device that is currently used most is mounted inside a cylindrically-shaped metal cartridge. This device costs less than the above-mentioned device but is shorter-lived and is moreover inconvenient in that if not suitably insulated dielectric strength problems ensue.
  • the application of the system subject of the invention brings down the cost of the appliance and extends its life for it transmits the temperature at points that are far less critical than pure connection points.
  • the present invention lies in the use of a safety fuse mounted at one of the thermostat connections, which fuse comprises an insulating box and a conducting strip that is welded at one end to the connection by means of a material that melts at a suitable temperature, whereas the other end stays free and constitutes a fast connection.
  • the insulating box is made of a self-extinguishing material, is mounted directly on the thermostat terminal, and internally comprises two parallel channels that are respectively designed to house the two ends of the conducting strip.
  • the upper channel houses the thermostat terminal and one of the ends of said strip, and thus for the two to be connected, the strip end is bent until it contacts the terminal and is then welded with a material having a suitable melting point.
  • the lower channel houses the other end of the strip, that passes through the said channel to leave its end free for connection to be made as appropriate to the terminal used.
  • the strip end welded to the thermostat terminal is therefore live, housed inside the insulating material box, and so when the weld is worn down by action of the heat the strips comes off the terminal and its end folds up to contact with the roof of the insulating plastic box, moving back to its initial position and hence breaking off the passage of current through it, ensuring that the appliance is switched off forthwith.
  • Figure 1. Shows three views of a thermostat without the fuse subject of the invention.
  • Figure 2. Shows three views of a thermostat with the fuse subject of the invention fitted.
  • Figure 3. Shows two cross-sections of the fuse subject of the invention, where it can be seen with the contact made.
  • Figure 4.- Shows two cross-sections of the fuse subject of the invention, where it can be seen with the contact broken off.
  • the fuse subject of the invention is arranged at one of the thermostat terminals and comprises a conducting strip and an insulating member (3), forming a sort of hollow box, with a mid-wall (4) that defines two parallel channels inside the box (3), an upper (5) and a lower (6) channel, for the said strip to be housed.
  • This box (3) has a slot (9) designed to be fitted directly onto the terminal (2), the said terminal being arranged inside the upper channel (5) and slightly above the mid-wall (4), passing through the box (3) and ending (2) in an upwardly folded extension entwined about the box (3) locking it in such position.
  • the conducting strip (7) is arranged inside the box (3), folded, as shown in figure 3, to achieve a better spring effect between its ends, and thus it defines a short end (7') and a long end (7'') with longitudinal grooves to make up a fast coupling.
  • the long end (7'') of the strip (7) is housed in the lower channel (6) and passes through the same to leave its end free, thereby to allow an easy connection thereto.
  • the short end (7') of the strip (7) is arranged inside the upper channel (5) and locked to the terminal by means of a weld (8) having a suitable melting point, thereby allowing the passage of current when the thermostat makes connection between terminal (1) and terminal (2).

Landscapes

  • Fuses (AREA)
  • Thermally Actuated Switches (AREA)
EP19950500119 1994-08-12 1995-08-10 Verbesserte Sicherung eingebaut im Thermostaten eines Haushaltsgerätes Expired - Lifetime EP0696811B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9402202 1994-08-12
ES9402202 1994-08-12

Publications (2)

Publication Number Publication Date
EP0696811A1 true EP0696811A1 (de) 1996-02-14
EP0696811B1 EP0696811B1 (de) 1997-12-17

Family

ID=8287787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950500119 Expired - Lifetime EP0696811B1 (de) 1994-08-12 1995-08-10 Verbesserte Sicherung eingebaut im Thermostaten eines Haushaltsgerätes

Country Status (2)

Country Link
EP (1) EP0696811B1 (de)
DE (1) DE69501236T2 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611235A (en) * 1970-07-01 1971-10-05 American Thermostat Corp Thermostat with built-in circuit breaker
DE2339674A1 (de) * 1973-08-04 1975-02-20 Thermostat & Schaltgeraetebau Kombinierter temperaturregler mit schmelzmetallsicherung
GB1540088A (en) * 1977-04-04 1979-02-07 Beswick Ltd K Fusible power resistors
US4720759A (en) * 1986-05-15 1988-01-19 Tobu Electric Co., Ltd. Compact protector utilizing a bimetal and an excessive rise prevention portion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611235A (en) * 1970-07-01 1971-10-05 American Thermostat Corp Thermostat with built-in circuit breaker
DE2339674A1 (de) * 1973-08-04 1975-02-20 Thermostat & Schaltgeraetebau Kombinierter temperaturregler mit schmelzmetallsicherung
GB1540088A (en) * 1977-04-04 1979-02-07 Beswick Ltd K Fusible power resistors
US4720759A (en) * 1986-05-15 1988-01-19 Tobu Electric Co., Ltd. Compact protector utilizing a bimetal and an excessive rise prevention portion

Also Published As

Publication number Publication date
DE69501236D1 (de) 1998-01-29
EP0696811B1 (de) 1997-12-17
DE69501236T2 (de) 1998-04-30

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