EP0557744B1 - Thermoschalter - Google Patents
Thermoschalter Download PDFInfo
- Publication number
- EP0557744B1 EP0557744B1 EP93101598A EP93101598A EP0557744B1 EP 0557744 B1 EP0557744 B1 EP 0557744B1 EP 93101598 A EP93101598 A EP 93101598A EP 93101598 A EP93101598 A EP 93101598A EP 0557744 B1 EP0557744 B1 EP 0557744B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leg
- switch according
- bent
- movable contact
- switch
- 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.)
- Expired - Lifetime
Links
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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 present invention relates to a self-holding thermal switch with two non-positively attached connecting parts to a support part, one of which has a fixed contact, while the other is connected to a movable contact switchable by a bimetal element, the fixed contact, the movable contact and the bimetal element forming a switching mechanism ,
- the support part is a ceramic part, and a heating resistor is electrically connected in parallel to the switching mechanism.
- Such a self-holding thermal switch is known from DE-A-35 39 425.
- the invention is based on so-called open thermal switches, which are installed, for example, in electrical heating devices, such as electrical radiators, hair dryers or the like, and are said to lead to a shutdown in the event of excess temperature.
- electrical heating devices such as electrical radiators, hair dryers or the like
- clocking ie switching the device on and off again, is prevented.
- Such clocking can occur if, as a result of a malfunction of the device, an overtemperature arises, which usually affects the temperature switch and its active switching element is a bimetallic element, opens so that no further current flow takes place and cooling can take place, through which the switch closes again, whereupon an overtemperature occurs again due to the malfunction of the device and the switch opens again.
- a resistor in parallel with the switch. Thick film resistors or PTC thermistors are known here, which are fixed to the switch, for example by clamping, by shrink sleeves or the like.
- DE-A-32 31 136 shows a bimetal switch with an insulating support part, in which connection elements are fixed, for example by the plastic support material being injection molded around the connection elements. Tongues are bent from the connecting elements, which carry the fixed and the movable contact.
- a thick-film resistor in the form of a flat, conductively coated ceramic plate is arranged below the supporting part and has rigid connecting lugs which are soldered to the actual connecting lugs of the switch.
- the switch naturally also has a spring element carrying the movable contact button and a bimetallic disc which effects the switching process.
- the switch is complex. It is complex to manufacture. Assembly processes must be carried out by hand.
- the switch consists of a variety of different materials, namely in addition to the metal sheet of the terminal lugs of the actual switch made of plastic, ceramic, a conductive thick layer.
- the bimetallic element is fixed both at its ends and in the center, which reduces its switching action and it can also be exposed to permanent forces which can change the switching point.
- DE-A-35 39 425 shows a generic thermal switch.
- a thin insulating ceramic plate is arranged between tines bent out of connecting lugs and soldered to them.
- the ceramic plate is in turn metallized, a spring element of the movable contact is fixed to a connecting lug, while the other connecting lug is provided with the fixed contact button.
- a plunger or bolt is fixed in the middle of the spring element, for example by means of a rivet which projects through a bimetallic disc 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 bimetal element. In practice, this switch only caused problems. It could not be realized in practice.
- thermal switch with a corresponding switching mechanism
- the two connection parts are connected to one another by two bolts which run parallel to one another and are electrically connected in parallel with the switching mechanism.
- One or both of the two bolts are said to be made of PTC thermistor material, and on the other hand, it is expressly mentioned in this US patent that one of the two bolts can be made of an insulating material in order to ensure that the thermal switch is held mechanically.
- the two connecting parts When assembling the known thermal switch, the two connecting parts must be adjusted by moving the bolt so that the switching mechanism switches reliably.
- the invention is therefore based on the object, while avoiding the disadvantages of the known switches, of creating an open, self-holding switch which consists of a few individual parts, is itself of simple design and can be produced in a simple and largely automated manner in terms of production technology.
- the support part is a block-shaped or cuboid-shaped PTC thermistor, which the connection parts each grip almost completely in a non-positive manner.
- the support part is itself designed as a PTC thermistor and as such carries the connection elements.
- the supporting part has the shape of a block or cuboid, which in particular is not too thin, but has a thickness that is not substantially less than half the width of the cuboid, preferably above half the dimension of the width of the cuboid.
- the PTC thermistor itself takes over the supporting function without the risk of breakage or damage.
- a preferred embodiment provides that the connecting straps are soldered to the PTC thermistor.
- a preferred development is characterized in that tabs formed by at least one connecting part are provided by U-shaped punched lines.
- one leg of a connecting part is bent by 180 ° under another leg of the connecting part and holds a movable contact made of bimetal between the two parts, or that on one connecting element one leg is 180 ° below another Leg is bent and both a movable contact and a switching bimetallic element are fixed between the two legs.
- the active element, the bimetal element thus carries the movable contact button itself, while in the latter embodiment, a bimetal element acts on a spring carrying the movable contact button.
- a preferred development for fixing the corresponding parts provides for jamming of movable contact and, if necessary, bimetallic element against the leg bent by 180 ° by means of a bent tab, wherein additional soldering can optionally be provided.
- the bimetallic disc can also be mounted in the center, either by pressing against the spring with the center and with its edge being supported on a rigid abutment, or vice versa, see the aforementioned configurations before that the bimetallic element is only fixed on one side at the edge and causes the switching effect with the diagonally opposite edge. This also avoids openings in the ceramic part to accommodate central centering or fastening elements for the bimetallic disc.
- a further preferred embodiment provides that the bent tab is punched out of the leg under which the leg was bent by a U-punching.
- the thermal switch 1 has, as a supporting part 2, a PTC thermistor in the form of a cuboid based on barium titanate or solid solutions of barium titanite and strontium titanate with further additives.
- connecting parts 3, 4 are fixed on the PTC thermistor 2.
- the connecting parts 3, 4 are shown wound up in detail in FIGS. 4 and 5.
- the connecting part 4 carries a fixed contact 6, while the connecting part 3 in the exemplary embodiment shown holds a movable contact 7 which can be switched by a bimetallic element 8 likewise fixed on the connecting part 3.
- the bimetallic element could in principle also be fixed, for example, with its center point to an arm 11 projecting over a spring element 9 of the movable contact 7 (similar to the fixing in DE-A-35 39 425), in the exemplary embodiment shown it is on one side (at 12 ), while it projects freely from there over its entire length.
- the arm 11 provided with reinforcing beads 10 thus protects the sensitive switching mechanism 7, 8, 9, in particular when the switch is installed in a device to be protected by it, against contact which could lead to a change in the switching characteristic.
- the switch works in a manner known per se of a self-holding switch. If the ambient temperature, be it external, be it so high due to excessive power supply and heating of the conductive parts that the switching temperature of the bimetallic element 8 is exceeded, this switches from the contact 6 and 7 shown in FIG. 1 permitting low temperature position in its high temperature position, in which it lifts the movable contact 7 from the fixed contact 6. If the low-resistance connection via the contacts 6, 7 is interrupted in this way, there is a greater current flow from the connecting straps 13, 14 via the PTC thermistor 2, which is heated thereby and through its heat keeps the bimetallic element 8 in its temperature position and thus 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 support surface 23 for the PTC thermistor 2.
- a T-web 24 of the T-shaped connecting element 4 is bent at 90 ° at lines 26, 26a, 27, 27a, whereby side walls 28, 28a and cover parts 29, 29a for the PTC thermistor 2 are formed.
- the PTC thermistor 2 can be held by these parts or walls 23, 28, 28a, 29, 29a which are bent 90 ° along the lines 26, 26a, 27, 27a.
- the connecting element 4 is soldered to the PTC thermistor in the sections 23, 28, 28a, 29, 29a comprising the PTC thermistor 2.
- tabs 31, 31a are formed which extend parallel to the central T-leg 21 and which, after the connecting element 4 has been bent, come to lie parallel to one another in the manner described.
- a contact button 32 is fixed (welded) as a fixed contact 6.
- connection element 3 also consists, like the connection element 4, of a flat material with a metal sheet. In the coiled, 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 above the switching elements (spring element 9 with movable contact, bimetal element 8).
- the leg or arm 43 opposite this is 180 ° (FIG. 1) under the central part 44 of the cross 41 and the leg 42 bent and forms a lower holding part for the switching elements - spring element 9 and bimetallic element 8. These are held clampingly between it and a tab 47 punched out of the leg 42 by a U-shaped punching 46. For additional securing, soldering can be provided.
- the flap 47 is for this purpose after bending the leg 42 against it downwards (bent towards the PTC thermistor 2), so as to fix the bimetallic element 8 and the spring element 9 between it and the leg 42.
- Further legs 51, 51a extend from the middle part 44 of the cross perpendicular to the legs 42, 43 in opposite directions. At bending lines 52, 52a, these are bent downwards by 90 °. They also have further bending lines 53, 53a at a greater distance than the distance of the bending line 27 and 26 or 26a and 27a - corresponding to the thickness of the PTC thermistor 2 - at which the legs 51, 51a in the same direction contribute to the bends 52, 52a are bent. In this way, the bent legs 51, 51a enclose a rectangular contour.
- U-shaped punchings 54, 54a are located at a distance from the bending lines 53, 53a, by means of which tabs 57, 57a which are connected to the legs 51, 51a and which are also formed around the bending lines 56, 56a are formed in the case of bending lines 56, 56a.
- 56a are bent in the same direction and even at 58, 58a - at a distance from the bending lines 56, 56a, which corresponds to just half the width of the PTC thermistor 2 - are again bent in opposite directions, so that the free ends 59, 59a of the tabs 57, 57a are parallel abut each other.
- the free ends 59, 59a can optionally be welded together.
- the PTC thermistor 2 is gripped and held by the connecting part 3 at a distance from the connecting part 4, with additional securing soldering between the connection part 1 and the PTC thermistor 2 can also be provided.
- On the free leg 51a extends parallel to the tab 43, a connecting tab 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 from the PTC thermistor 2 forming a supporting part, the connecting parts 3, 4, the bimetallic element 8, the spring element 9 and the contact buttons 7, 32.
- the latter are firmly connected to the spring element 9 or the art-fitting part 4 how welded or soldered.
- the switch according to the invention is also produced in a simple and inexpensive manner and can be carried out fully automatically.
- the connecting parts 3, 4 are punched out of sheet metal with the contour shown in FIGS. 3, 4.
- the eyelets 30, 60 on the connecting parts 22, 61 and the U-shaped punchings 46, 54, 54a are made.
- reinforcing beads 50 are stamped into the arm 11 or the leg 42 and the middle part 44 of the connecting part 3.
- the bending of the leg 43 and the bending at the bending lines 53, 53a, 56, 56a, 57, 57a continue, as in the same way the bending at the bending lines 26, 26a, 27, 27a at the connecting part 4.
- the contact button 43 is attached in a further step, while on the connecting part 3 the switching elements - bimetallic element 8 and spring element 9 are fixed with the contact button, by inserting them between the end of the leg 42 and the tab 47 and by bending the latter between this and the leg 42 are clamped, while still a additional securing can be done by soldering. Finally, the pre-bent connecting parts 3, 4 are pushed over the supporting part 2 (PTC thermistor), continue to be non-positively pressed with this and optionally additionally soldered.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4206157A DE4206157A1 (de) | 1992-02-28 | 1992-02-28 | Thermoschalter |
DE4206157 | 1992-02-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0557744A1 EP0557744A1 (de) | 1993-09-01 |
EP0557744B1 true EP0557744B1 (de) | 1996-05-01 |
Family
ID=6452796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93101598A Expired - Lifetime EP0557744B1 (de) | 1992-02-28 | 1993-02-03 | Thermoschalter |
Country Status (5)
Country | Link |
---|---|
US (1) | US5309131A (ja) |
EP (1) | EP0557744B1 (ja) |
JP (1) | JP2777042B2 (ja) |
AT (1) | ATE137602T1 (ja) |
DE (2) | DE4206157A1 (ja) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1007770A3 (nl) * | 1993-11-12 | 1995-10-17 | Philips Electronics Nv | Ontladingslamp voorzien van bimetaalschakelaar en bimetaalschakelaar geschikt voor een lamp. |
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 |
DE19816809C2 (de) * | 1998-04-16 | 2001-10-18 | 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 |
DE19847209C2 (de) * | 1998-10-13 | 2002-04-25 | Marcel Hofsaes | Schalter mit einem Isolierstoffträger |
DE19847208C2 (de) * | 1998-10-13 | 2002-05-16 | 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 |
US7659805B2 (en) * | 2005-02-02 | 2010-02-09 | Uchiya Thermostat Co., Ltd. | Thermostat |
WO2007043238A1 (ja) * | 2005-10-14 | 2007-04-19 | Uchiya Thermostat Co., Ltd. | 温度スイッチ |
US7800477B1 (en) | 2007-03-20 | 2010-09-21 | Thermtrol Corporation | Thermal protector |
WO2009095961A1 (ja) * | 2008-01-28 | 2009-08-06 | Uchiya Thermostat Co., Ltd. | サーマルプロテクタ |
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 |
JP5300840B2 (ja) * | 2008-04-18 | 2013-09-25 | タイコエレクトロニクスジャパン合同会社 | 回路保護デバイス |
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 |
Family Cites Families (15)
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 |
DE8223614U1 (de) * | 1982-08-21 | 1985-05-09 | 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 |
US4703298A (en) * | 1986-11-04 | 1987-10-27 | Texas Instruments Incorporated | Thermostat with ceramic mounting pins of resistive material |
DE3644514A1 (de) * | 1986-12-24 | 1988-07-07 | Inter Control Koehler Hermann | Bimetallschalter |
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 |
EP0373350A3 (de) * | 1988-12-12 | 1992-02-05 | INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG | Bauteil, insbesondere für den Einsatz als Heizwiderstand sowie Temperaturregelvorrichtung |
JPH02126336U (ja) * | 1989-01-17 | 1990-10-18 | ||
DE9004941U1 (ja) * | 1990-05-01 | 1991-05-29 | Hofsaess, Peter, 7530 Pforzheim, De |
-
1992
- 1992-02-28 DE DE4206157A patent/DE4206157A1/de not_active Withdrawn
-
1993
- 1993-02-03 DE DE59302405T patent/DE59302405D1/de not_active Expired - Fee Related
- 1993-02-03 AT AT93101598T patent/ATE137602T1/de not_active IP Right Cessation
- 1993-02-03 EP EP93101598A patent/EP0557744B1/de not_active Expired - Lifetime
- 1993-02-25 JP JP5036475A patent/JP2777042B2/ja not_active Expired - Fee Related
- 1993-03-01 US US08/024,458 patent/US5309131A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5309131A (en) | 1994-05-03 |
DE4206157A1 (de) | 1993-09-16 |
ATE137602T1 (de) | 1996-05-15 |
DE59302405D1 (de) | 1996-06-05 |
JP2777042B2 (ja) | 1998-07-16 |
JPH06295650A (ja) | 1994-10-21 |
EP0557744A1 (de) | 1993-09-01 |
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