EP0557744A1 - Interrupteur thermique - Google Patents

Interrupteur thermique Download PDF

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Publication number
EP0557744A1
EP0557744A1 EP93101598A EP93101598A EP0557744A1 EP 0557744 A1 EP0557744 A1 EP 0557744A1 EP 93101598 A EP93101598 A EP 93101598A EP 93101598 A EP93101598 A EP 93101598A EP 0557744 A1 EP0557744 A1 EP 0557744A1
Authority
EP
European Patent Office
Prior art keywords
switch according
leg
bent
switch
parts
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
EP93101598A
Other languages
German (de)
English (en)
Other versions
EP0557744B1 (fr
Inventor
Peter Hofsäss
Jens Radbruch
Günter Kruck
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.)
ERBENGEMEINSCHAFT PETER HOFSAESS
Original Assignee
ERBENGEMEINSCHAFT PETER HOFSAESS
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Filing date
Publication date
Application filed by ERBENGEMEINSCHAFT PETER HOFSAESS filed Critical ERBENGEMEINSCHAFT PETER HOFSAESS
Publication of EP0557744A1 publication Critical patent/EP0557744A1/fr
Application granted granted Critical
Publication of EP0557744B1 publication Critical patent/EP0557744B1/fr
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
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means

Definitions

  • the invention relates to a thermal switch with two attached to a support member connecting parts, one of which has a fixed contact, while the other high impedance with a switchable by a bimetallic movable contact, wherein the support member is a ceramic part, is connected.
  • the invention is based on so-called open thermal switches, which are installed for example in electric heaters, such as electric radiators, hair dryers or the like and should lead to a shutdown at excess temperature.
  • a clock ie, each turn on and off the device is prevented.
  • Such a clocking may occur if, due to a malfunction of the device, an excess temperature is generated, the temperature switch whose active switching element usually a bimetallic element is open, so that no further current flow takes place and a cooling can take place, through which the switch closes again, whereupon due to the malfunction of the device in turn an excess temperature occurs and opens the switch again.
  • a resistor parallel to the switch for example, thick-film resistors or PTC thermistors are known which are fixed to the switch, for example by clamping, by shrink sleeves or the like.
  • DE-A-32 31 136 shows a bimetallic switch with an insulating support member in which connection elements are fixed, for example by the plastic carrier material is injected around the connection elements. From the connection elements tongues are bent, which carry the fixed and the movable contact. Below the support member, a thick film resistor in the form of a flat conductive coated ceramic plate is arranged, which has rigid terminal lugs, which are soldered to the actual terminal lugs of the switch.
  • the switch also has a spring element carrying the movable contact button and a bimetallic disc which effects the switching operation.
  • the switch is elaborate. He is consuming in the production. It must be done by hand assembly operations. Moreover, it is unfavorable that the switch of a variety of different materials, namely next to the metal sheet of the terminal lugs of the actual switch made of plastic, ceramic, a conductive thick film consists. adversely is also that the bimetallic element is fixed both at its ends and in the middle, whereby its switching action is reduced and it may also be exposed to permanent forces that can change the switching point.
  • DE-A-35 39 425 shows a generic thermal switch.
  • a thin insulating ceramic plate is disposed between and soldered out of terminal lugs tines.
  • the ceramic plate is in turn metallized, on a terminal lug a spring element of the movable contact is fixed, while the other terminal lug is provided with the fixed contact button.
  • a plunger or bolt is fixed, for example, by a rivet of a bimetallic disc protrudes, which rests on the ceramic part.
  • the ceramic part is also metallized so that the metallization forms the high resistance parallel resistor for keeping the switch open after opening by the bimetallic element. This switch has only led to problems in practice. He could not be realized in practice.
  • the insulating ceramic plate must be additionally provided with a conductive coating. Also weakens the breakthrough, through which the bimetallic disc centering plunger protrudes, the already thin ceramic plate, so that it can easily break.
  • the switching path of the bimetal disc is again limited by the central definition. Also, the spring action and thus the switching action of the movable contact bearing spring is affected by the rivet located on it.
  • the invention is therefore based on the object, while avoiding the disadvantages of the known switch to create an open self-holding switch, which consists of a few individual parts, itself is simple and manufacturing technology in a simple and largely automatable manner can be produced.
  • the stated object is achieved in a generic switch in that the connecting parts embrace the support member almost completely non-positively.
  • a simple automatic production of a simple switch is made possible. It achieves a reliable hold, without perforations or holes for fixing rivets or the like in the ceramic support member are required. Such breakthroughs are only consuming and hardly produced with the desired accuracy. They would continue to weaken the support.
  • the support member is a PTC thermistor.
  • the support member itself is designed as a PTC thermistor and carries as such the connection elements.
  • the support member preferably has the shape of a block or cuboid, which in particular is not too thin, but has a thickness which is not substantially less than half the width of the cuboid, preferably over half the dimension of the width of the cuboid.
  • the PTC thermistor itself assumes the supporting function without the risk of breakage or damage.
  • In concrete embodiment may be provided to determine the terminal lugs on the support PTC thermistor that tabs of the connecting parts almost completely embrace the support member. To further secure a preferred embodiment provides that the terminal lugs are soldered to the PTC thermistor.
  • a preferred development is characterized in that tabs formed by means of U-shaped punched-out lines are provided at least on one connecting part.
  • a leg of a connecting part is bent by 180 ° under another leg of the connecting part and holds a movable contact between the two parts, which is formed of bimetal or that at a connecting element, a leg 180 ° under another Leg is bent and between both legs, both a movable contact and a switching bimetallic element are fixed.
  • a bimetallic element acts on a spring carrying the movable contact button.
  • the bimetallic disc may be mounted centrally by either pressing with the center against the spring and is supported with its edge on a rigid abutment or vice versa, see the aforementioned embodiments before that the bimetallic element is fixed only on one side of the edge and causes the switching action with the diagonally opposite edge. This also avoids breakthroughs in the ceramic part for receiving central centering or fastening elements for the bimetal disc.
  • a further preferred embodiment provides that the bent tab is punched out by a U-punching from the leg, under which the leg was bent.
  • the thermal switch 1 has in the illustrated embodiment as a supporting part 2 a PTC thermistor in the form of a cuboid on the basis of barium titanate or solid solutions of barium titanite and strontium titanate with other additives.
  • connecting parts 3, 4 are fixed to the PTC thermistor 2.
  • the connecting parts 3, 4 are shown wound in detail in Figures 4 and 5.
  • the connecting part 4 carries a fixed contact 6, while the connecting part 3 holds in the illustrated embodiment, a movable contact 7, which is switchable by a likewise fixed to the connecting part 3 bimetallic element 8.
  • the bimetal element could in principle also be fixed, for example, with its center on a spring 11 of the movable contact 7 superior arm 11 (similar to the definition in DE-A-35 39 425), it is in the illustrated embodiment on one side (at 12 ) while projecting freely therefrom over its entire length.
  • the provided with reinforcing beads 10 arm 11 thus protects the sensitive switching mechanism 7, 8, 9, in particular when installing the switch in a device to be protected by him against contact, which could lead to a change in the switching characteristic.
  • the switch works in a conventional manner a self-holding switch. If the ambient temperature, be it externally or too high due to excessive current supply and heating of the conductive parts so that the switching temperature of the bimetallic element 8 is exceeded, it switches from its illustrated in Figure 1, a contact of the contacts 6 and 7th permitting low temperature position in its high temperature position, in which it lifts the movable contact 7 from the fixed contact 6. If so the low-resistance connection is interrupted via the contacts 6, 7, so there is a stronger current flow from the terminal lugs 13, 14 via the PTC thermistor 2, which is thereby heated and by its heat holds the bimetallic element 8 in its temperature position and thus via this the contacts 6, 7 in the open position.
  • the connecting part 4 is T-shaped.
  • a middle leg 21 forms the connecting lug 22 of the connecting element 4 and a bearing surface 23 for the PTC thermistor 2.
  • a T-bar 24 of the T-shaped connecting element 4 is at lines 26, 26a, 27, 27a each bent at 90 °, whereby side walls 28, 28a and cover parts 29, 29a are formed for the PTC thermistor 2.
  • the PTC thermistor 2 can be frictionally held by these by 90 ° along the lines 26, 26a, 27, 27a bent parts or walls 23, 28, 28a, 29, 29a.
  • the connection element 4 is soldered to the PTC thermistor in sections 23, 28, 28a, 29, 29a comprising the PTC thermistor 2.
  • connection element 3 is also made, like the connection element 4, of a flat material, with metal sheet.
  • connection element 4 In the wound-up, ie not bent state, which is shown in FIG. 4, it has the basic shape of a cross 41.
  • a first leg 42 of the cross 41 forms the arm 11 projecting over the switching elements (spring element 9 with movable contact, bimetallic element 8).
  • the arm or arm 43 opposite this is at 180 ° (FIG. 1) below the middle part 44 of the cross 41 and the legs 42 bent and forms a lower holding part for the switching elements - spring element 9 and bimetallic element 8.
  • These are clamped between it and a punched out of the leg 42 by a U-shaped punch 46 tab 47.
  • the tab 47 is for this purpose after bending the leg 42 against this downward (in the direction of the PTC thermistor 2 out), so as to define between it and the leg 42, the bimetallic element 8 and the spring element 9.
  • legs 51, 51 a From the central part 44 of the cross extending perpendicular to the legs 42, 43 respectively in opposite directions further legs 51, 51 a. These are bent at bending lines 52, 52a by 90 ° downwards. They continue to point at a greater distance than he at the distance of the bending line 27 and 26 or 26a and 27a - corresponding to the strength of the PTC thermistor 2 -, more bending lines 53, 53a, where the legs 51, 51a in the same direction at the bends 52, 52 a are bent over.
  • the bent legs 51, 51a include a rectangular contour.
  • the PTC thermistor 2 is enclosed and held by the connecting part 3 at a distance from the connecting part 4, with additional securing being provided also soldering between the connector 1 and the PTC thermistor 2 may be provided.
  • On the free leg 51a extends parallel to the tab 43, a connecting lug 61, on which the further contact to the switch according to the invention can be made.
  • the switch according to the invention consists of a few parts, namely the thermistor forming a supporting part 2, the connecting parts 3, 4, the bimetallic element 8, the spring element 9 and the contact buttons 7, 32nd The latter are firmly connected to the spring element 9 and the Artschlußteil 4 as welded or soldered.
  • the manufacture of the switch according to the invention also takes place in a simple and inexpensive manner and can be carried out fully automatically.
  • the connecting parts 3, 4 are punched out of sheets with the apparent from Figures 3, 4 contour.
  • the eyelets 30, 60 made on the connecting parts 22, 61 and the U-shaped punched-46, 54, 54a.
  • reinforcing beads 50 are embossed in the arm 11 and the leg 42 and the middle part 44 of the connecting part 3.
  • the bend of the leg 43 and also the bend continues at the bending lines 53, 53 a, 56, 56 a, 57, 57 a, as in the same way the bends on the bending lines 26, 26 a, 27, 27 a take place at the connection part 4.
  • the contact button 43 is mounted in a further step, while the connecting part 3, the switching elements - bimetallic element 8 and spring element 9 are fixed with contact button by inserted between the end of the leg 42 and the tab 47 and by bending the latter between this and the leg 42 are clamped, wherein a further additional security can be done by soldering. Finally, the pre-bent terminal parts 3, 4 are pushed over the support member 2 (PTC thermistor), with this further pressed non-positively and optionally additionally soldered.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Thermistors And Varistors (AREA)
  • Cookers (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Switches With Compound Operations (AREA)
EP93101598A 1992-02-28 1993-02-03 Interrupteur thermique Expired - Lifetime EP0557744B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4206157 1992-02-28
DE4206157A DE4206157A1 (de) 1992-02-28 1992-02-28 Thermoschalter

Publications (2)

Publication Number Publication Date
EP0557744A1 true EP0557744A1 (fr) 1993-09-01
EP0557744B1 EP0557744B1 (fr) 1996-05-01

Family

ID=6452796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101598A Expired - Lifetime EP0557744B1 (fr) 1992-02-28 1993-02-03 Interrupteur thermique

Country Status (5)

Country Link
US (1) US5309131A (fr)
EP (1) EP0557744B1 (fr)
JP (1) JP2777042B2 (fr)
AT (1) ATE137602T1 (fr)
DE (2) DE4206157A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653777B1 (fr) * 1993-11-12 1998-03-04 Koninklijke Philips Electronics N.V. Lampe à décharge comprenant un interrupteur bimétallique et interrupteur bimétallique adapté à une lampe
EP0951041A2 (fr) * 1998-04-16 1999-10-20 Thermik Gerätebau GmbH Interrupteur à commande thermique

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19514853C2 (de) * 1995-04-26 1997-02-27 Marcel Hofsaes Temperaturwächter mit einem bei Übertemperatur schaltenden Bimetall-Schaltwerk
DE19546004C2 (de) * 1995-12-09 1998-01-15 Hofsaes Marcel Schalter mit einem bei Übertemperatur schaltenden Schaltwerk
US5828287A (en) * 1996-12-31 1998-10-27 Nilson; Bruce G. Automatic thermal shut-off switch
DE19727197C2 (de) * 1997-06-26 1999-10-21 Marcel Hofsaess Temperaturabhängiger Schalter mit Kontaktbrücke
US6191680B1 (en) * 1998-02-23 2001-02-20 HOFSäSS MARCEL Switch having a safety element
JPH11353992A (ja) * 1998-04-07 1999-12-24 Yamada Electric Mfg Co Ltd サーマルプロテクタ
DE19816807C2 (de) * 1998-04-16 2000-06-08 Thermik Geraetebau Gmbh Temperaturabhängiger Schalter
US5936510A (en) * 1998-05-22 1999-08-10 Portage Electric Products, Inc. Sealed case hold open thermostat
DE19827113C2 (de) * 1998-06-18 2001-11-29 Marcel Hofsaes Temperaturabhängiger Schalter mit Stromübertragungsglied
DE19833983A1 (de) * 1998-07-29 2000-02-03 Ego Elektro Geraetebau Gmbh Verfahren zur Herstellung eines elektrischen Schaltgeräts und elektrisches Schaltgerät
DE19847208C2 (de) * 1998-10-13 2002-05-16 Marcel Hofsaes Schalter mit einem Isolierstoffträger
DE19847209C2 (de) * 1998-10-13 2002-04-25 Marcel Hofsaes Schalter mit einem Isolierstoffträger
US6559752B1 (en) 1999-05-24 2003-05-06 Frank J. Sienkiewicz Creepless snap acting bimetallic switch having flexible contact members
JP3756700B2 (ja) * 1999-07-22 2006-03-15 ウチヤ・サーモスタット株式会社 サーマルプロテクタ
US6498559B1 (en) 2000-05-24 2002-12-24 Christopher Cornell Creepless snap acting bimetallic switch having step adjacent its bimetallic element
JP4471479B2 (ja) * 2000-10-13 2010-06-02 ウチヤ・サーモスタット株式会社 サーマルプロテクタ
JP2004014434A (ja) * 2002-06-11 2004-01-15 Uchiya Thermostat Kk 直流電流遮断スイッチ
WO2006082749A1 (fr) * 2005-02-02 2006-08-10 Uchiya Thermostat Co., Ltd. Thermostat
CN101288142B (zh) * 2005-10-14 2010-12-01 打矢恒温器株式会社 温度开关
US7800477B1 (en) 2007-03-20 2010-09-21 Thermtrol Corporation Thermal protector
DE112008003632B4 (de) * 2008-01-28 2023-04-06 Uchiya Thermostat Co., Ltd. Hitzeschutz
JP5174893B2 (ja) * 2008-04-10 2013-04-03 ウチヤ・サーモスタット株式会社 外部操作型サーマルプロテクタ
WO2009128535A1 (fr) * 2008-04-18 2009-10-22 タイコ エレクトロニクス レイケム株式会社 Dispositif de protection de circuit
CN103515145A (zh) * 2013-09-29 2014-01-15 扬州宝珠电器有限公司 过热过流延时复位保护器
CN103824728A (zh) * 2014-03-06 2014-05-28 东莞市凯恩电子科技有限公司 可控温保险管

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4703298A (en) * 1986-11-04 1987-10-27 Texas Instruments Incorporated Thermostat with ceramic mounting pins of resistive material
EP0272696A2 (fr) * 1986-12-24 1988-06-29 INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG Interrupteur à bilame
EP0373350A2 (fr) * 1988-12-12 1990-06-20 INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG Elément de construction pour l'emploi comme résistance chauffante et dispositif de régulation de la température

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US3322920A (en) * 1963-09-09 1967-05-30 Therm O Disc Inc Thermostatic control having magnified movement of snap member
JPS54140977A (en) * 1978-04-26 1979-11-01 Matsushita Electric Works Ltd Thermoswitch
DE3231136C2 (de) * 1982-08-21 1984-08-23 Limitor AG, 8022 Zürich Bimetallschutzschalter
DE3319227A1 (de) * 1983-05-27 1984-11-29 Microtherm Gmbh, 7530 Pforzheim Thermoschalter
JPS603862A (ja) * 1983-06-22 1985-01-10 Seiko Instr & Electronics Ltd 二次電池
US4610025A (en) * 1984-06-22 1986-09-02 Champollion Incorporated Cryptographic analysis system
DE3539425A1 (de) * 1985-11-07 1987-05-14 Limitor Ag Thermobimetallschalter
JPS62222529A (ja) * 1986-03-25 1987-09-30 松下電工株式会社 サ−モスイツチ
DE3711666A1 (de) * 1987-04-07 1988-10-27 Hofsass P Temperaturschalter
JPH0834075B2 (ja) * 1988-03-29 1996-03-29 東部電気株式会社 サーマルスイッチ
JPH02126336U (fr) * 1989-01-17 1990-10-18
DE9004941U1 (de) * 1990-05-01 1991-05-29 Hofsäss, Peter, 75181 Pforzheim Halter zum Befestigen eines Temperaturschalters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4703298A (en) * 1986-11-04 1987-10-27 Texas Instruments Incorporated Thermostat with ceramic mounting pins of resistive material
EP0272696A2 (fr) * 1986-12-24 1988-06-29 INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG Interrupteur à bilame
EP0373350A2 (fr) * 1988-12-12 1990-06-20 INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG Elément de construction pour l'emploi comme résistance chauffante et dispositif de régulation de la température

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653777B1 (fr) * 1993-11-12 1998-03-04 Koninklijke Philips Electronics N.V. Lampe à décharge comprenant un interrupteur bimétallique et interrupteur bimétallique adapté à une lampe
EP0951041A2 (fr) * 1998-04-16 1999-10-20 Thermik Gerätebau GmbH Interrupteur à commande thermique
EP0951041A3 (fr) * 1998-04-16 2000-08-02 Thermik Gerätebau GmbH Interrupteur à commande thermique

Also Published As

Publication number Publication date
DE4206157A1 (de) 1993-09-16
EP0557744B1 (fr) 1996-05-01
ATE137602T1 (de) 1996-05-15
JPH06295650A (ja) 1994-10-21
DE59302405D1 (de) 1996-06-05
JP2777042B2 (ja) 1998-07-16
US5309131A (en) 1994-05-03

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