EP0045007B1 - Elektrische Kochplatte mit einem Temperaturschalter - Google Patents

Elektrische Kochplatte mit einem Temperaturschalter Download PDF

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Publication number
EP0045007B1
EP0045007B1 EP81105537A EP81105537A EP0045007B1 EP 0045007 B1 EP0045007 B1 EP 0045007B1 EP 81105537 A EP81105537 A EP 81105537A EP 81105537 A EP81105537 A EP 81105537A EP 0045007 B1 EP0045007 B1 EP 0045007B1
Authority
EP
European Patent Office
Prior art keywords
snap
cooking plate
casing
action switch
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
Application number
EP81105537A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0045007A1 (de
Inventor
Karl Fischer
Felix Schreder
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
Priority to AT81105537T priority Critical patent/ATE7534T1/de
Publication of EP0045007A1 publication Critical patent/EP0045007A1/de
Application granted granted Critical
Publication of EP0045007B1 publication Critical patent/EP0045007B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/34—Means for transmitting heat thereto, e.g. capsule remote from contact member

Definitions

  • the invention relates to an electric hotplate with a temperature switch according to the preamble of claim 1.
  • the overheating protection switch inserted in the lower hotplate cover has a ceramic housing, in the interior of which a bimetal strip and a snap switch are arranged. It is supported with its housing on the underside of the hotplate and, in addition to its connection to the power supply and to hotplate fastenings for further hotplate connections, so that it simultaneously forms the connection leadthrough through the hotplate cover.
  • the fastenings are designed as openings in the housing.
  • DE-A-2735426 (& US-A-4153833) describes a temperature switch which simultaneously connects the connections, e.g. B. screw connections, the hotplate contains and is placed on the outside of the hotplate. A separate part is inserted into the cover for making the hotplate connections. An arched bimetal protrudes through the lower cover into the space below the hotplate and transfers its working movement to the switch in the housing by means of a push rod.
  • a circuit breaker which consists of a small hollow ceramic body into which a snap switch influenced by a bimetal strip is inserted. It is located in the unheated center of the hotplate. Bimetal strips and switches are located in the housing, which is attached to the underside of the hotplate.
  • the invention has for its object to provide a hotplate with a temperature switch, in which the responsiveness is improved and the thermal inertia is reduced with simple manufacture, so that the temperature switch responds faster and more accurately to a temperature rise and fall of the hotplate.
  • the temperature switch also forms the feed-through part with which, in addition to the connections connected to the switch, the other hotplate connections are also fixed and guided through the lower hotplate cover into the interior of the heated annular space of the hotplate.
  • the housing is preferably supported with a shoulder at the edge of an opening of the cover and stands on the underside of the hotplate with housing projections, which are preferably designed as relatively thin feet on both narrow sides of the housing. This creates a well-ventilated, free space in which the bimetal is arranged and thus exposed to radiant heat and convection.
  • the bimetal follows the temperature of the heating much better, so that it not only represents an overheating protection switch with a timer, as was the case with previous versions, but a real temperature switch. Due to the high thermal inertia and inertia of the switching behavior, previous overheating protection switches required so long to switch on again after the single switch-off that the hotplate was only operated with part of its power in normal operation and did not have sufficient power.
  • the structure of the switch is particularly simple according to the invention, since the housing is formed in two parts from a base part and a cover part, the space in the base part being arranged in the form of a laterally open recess which is closed by the cover part placed on the side.
  • the cover part can preferably have the housing projections resting on the underside of the hotplate. In this way, it is possible to fix the components of the switch and the bimetal by inserting them laterally into slots in the base part of the housing and to secure them by attaching the cover part.
  • the shape of the ceramic parts is very simple, which makes it easier to manufacture them from steatite.
  • the design of the switch means that the mass of the temperature switch housing, which is close to the heater and below the cover, can be kept low. This not only has the already explained advantage that the switch responds faster, but also ensures that when the hotplate is heated up, these parts heat up quickly and thus no cold condensation point is created at which condensation water can precipitate, which increases the leakage currents.
  • the switch which is preferably designed as a snap-action switch with a clamped spring tongue, is loaded in the normal on state by a contact pressure spring, and the transmission element is always held in a defined position, thereby preventing displacement or tilting becomes. Only when approached Chen the switch, the transmission member comes into engagement with the bimetallic snap mechanism and causes a shutdown, the forces of the bimetal and the biasing spring superimposed.
  • Fig. 1 shows a conventional hotplate 11 with a cast body, which has on its underside separated by ribs spiral grooves in which the heater 12 is arranged in an investment.
  • a heated annular space 19 into which a temperature switch 16 projects.
  • the housing 22 of the temperature switch protrudes through an opening of the cover 18 and is supported on it by shoulders 57.
  • the cover with the free ends of housing projections 49 presses it against the underside of the hotplate 50, ie. H. the underside of the heating in the heated annulus 19.
  • the temperature switch 16 is electrically connected by means of a terminating tab 28 to a connecting wire 14 which leads to a conventional connecting piece 17 which is attached to a mounting plate somewhat outside the hotplate.
  • a connection tab 35 shown in FIGS. 2 and 3 in the side of the temperature switch located in the interior 19 is connected to a heating resistor 12.
  • connection to the heating resistors 12 follows in the usual way via connecting pins 13 protruding from the investment material, to which connecting lines 15 are welded. It can be seen that the temperature switch, in addition to its own electrical connections via the connecting lugs 28 and 35 for fixing and guiding the other connecting wires 15, has bushings 52 in the form of a plurality of openings or holes provided in the housing 22. The connecting wires 15 protrude through this, so that the temperature switch at the same time fulfills the task of an insulation bushing through the lower cover 18.
  • the structure of the temperature switch 16 is shown in detail in FIGS. 2 to 4, with FIG. 2 representing the open or switch-off position and FIG. The normal, closed switch-on position of the switch. It has a housing 22, the base part of which has an elongated inner laterally open recess 23. The housing 22 is closed on the upper side and laterally it is closed off by a cover part 48, the parts of which protrude beyond the base part form the housing projections 49 in the form of downwardly projecting feet arranged near the narrow sides of the housing.
  • the fixed contact 24 of a snap switch 62 is arranged on the central part of a flat component 25, the left end 26 (FIG. 2) of which is in a slot 27 which is open on one side and the outer end 28 which is bent at right angles extends through a slot 29 in the housing 22 to the outside .
  • the outer end 28 forms a connection tab.
  • the power supply to the movable contact 31 of the snap switch 62 takes place via an elongated snap switch carrier 30 which is bent several times approximately at right angles and whose part 32 is fixed in a continuous slot 33 by insertion.
  • the latter has a recess 34 approximately in its center, with which it is supported against the wall of the recess 23.
  • the outer end 35 of the component 30 also forms a connection tab.
  • a notch 37 is made, in which the cutting edge 38 of the snap switch lever 39 is mounted.
  • the end of the snap switch lever 39 assigned to the cutting edge 38 is conductively connected to the end of the snap switch carrier 30 via a soldered metallic strand 40.
  • a resilient tongue 41 is connected, which is biased such that it rests on the snap switch carrier 30 in the unloaded state.
  • the free end 42 of the tongue 41 is bent to form an acute angle, the free end of the snap switch spring 43 engaging in this acute angle.
  • a pin 45 inserted with play in a bore 44 of the housing 22 engages, the other end of which is acted upon by the bimetal strip 46. Due to the pretensioning of the tongue 41, it normally rests on the snap switch carrier 30.
  • a leaf spring 60 running parallel to the bimetal 46 with a trough receiving the pin 45, the latter is held in contact with the tongue 41, so that it always assumes a defined position and cannot tilt.
  • the bimetallic strip 46 is welded to the section of the snap switch carrier 30 lying outside the housing 22. 2 and 3, the narrowly hatched area represents the part of the bimetallic strip which has the greater coefficient of thermal expansion.
  • an adjusting screw 47 is used in the free end of the Bimetallic strip 46. It can be used to set the opening and closing temperature of the temperature switch 19.
  • the bimetallic strip 46 bends in such a way that its free end in FIG. 2 is pivoted upwards, this movement being transmitted through the pin 45 to the tongue 41 and thus to the right end of the snap switch spring 43.
  • the snap switch lever 39 snaps into the position shown in FIG. 2, in which the two contacts 24 and 31 are separated from one another and thus the circuit is open.
  • the cover part 48 covers the recess 23 of the base part and is fastened to it by means of fastening rivets 54 (FIGS. 2 and 3).
  • the leg-like housing projections 49 arranged on the cover part 48 together with a lower edge 55 of the cover part which projects slightly beyond the lower edge of the base part, create a space 61 in which the bimetal is well ventilated and thermally coupled to the heating, but is protected against contact , since it is live.
  • the protrusions fix the temperature switch 16 and ensure an exact distance of the bimetal from the heater, and they have a relatively small cross section in order to keep their thermal mass low. They also provide mechanical protection for the bimetal.
  • the bushings 52 already mentioned protrude through the cover part, so that the connecting wires 15 can be passed through the cover 18 without risk of contact with other conductive parts.
  • the temperature switch shown in FIG. 2 is the same as in FIG. 2 except for the following differences:
  • the snap switch carrier 30 leads with one end through a slot on the side facing away from the bimetal out of the housing, is thereby fixed and forms a connecting tongue 35 'for the Power supply.
  • the other end is also angled and lies in a slot, which is, however, within the housing.
  • the bimetal is essentially Z-shaped and riveted to the snap switch carrier 30 'with a shorter leg.
  • the leaf spring 60 ' has essentially the same Z shape as the bimetal, is also fastened to the snap switch carrier 30' and lies between the latter or the housing and the bimetal. At its end it has an opening through which a tapered pin of the rod-like transmission member 45 'projects. The other end of the transmission pin 45 'is offset in the same way and protrudes through an opening of a component attached to the resilient tongue 41', so that the transmission rod is fixed under pressure between the leaf spring 60 'and the resilient tongue 41', which it lead like a parallelogram. The leaf spring 60 'presses against the force of this resilient tongue or the snap spring tongue 43 and sets this under a pretension.
  • both forces add up, so that even larger switching forces of the snap switch 63 can be overcome without undue stress on the bimetal.
  • the non-positive parallelogram guidance eliminates any switching inaccuracies caused by the transmission pin not wobbling.
  • the bimetal is free of force during normal operation, i.e. when the hotplate is not overheated, and is therefore not exposed to any permanent load that could lead to bending.
  • the safe position of the transmission pin makes it easy to adjust the switch by moving an adjustment wedge between the adjustment screw 47 and the transmission pin 45 ', so that the desired switching temperature can be set with a small adjustment of the short adjustment screw.

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  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Cookers (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Laminated Bodies (AREA)
  • Table Devices Or Equipment (AREA)
  • Electric Stoves And Ranges (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Push-Button Switches (AREA)
  • Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
  • Paper (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Shovels (AREA)
EP81105537A 1980-07-24 1981-07-15 Elektrische Kochplatte mit einem Temperaturschalter Expired EP0045007B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81105537T ATE7534T1 (de) 1980-07-24 1981-07-15 Elektrische kochplatte mit einem temperaturschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803027998 DE3027998A1 (de) 1980-07-24 1980-07-24 Elektrische kochplatte mit einem ueberhitzungsschutzschalter
DE3027998 1980-07-24

Publications (2)

Publication Number Publication Date
EP0045007A1 EP0045007A1 (de) 1982-02-03
EP0045007B1 true EP0045007B1 (de) 1984-05-16

Family

ID=6107967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105537A Expired EP0045007B1 (de) 1980-07-24 1981-07-15 Elektrische Kochplatte mit einem Temperaturschalter

Country Status (21)

Country Link
US (1) US4386263A (no)
EP (1) EP0045007B1 (no)
JP (1) JPS5935613B2 (no)
AT (1) ATE7534T1 (no)
AU (1) AU546489B2 (no)
CA (1) CA1173883A (no)
CH (1) CH654708A5 (no)
DE (2) DE3027998A1 (no)
DK (1) DK325881A (no)
ES (1) ES259627U (no)
FI (1) FI69739C (no)
FR (1) FR2487622A1 (no)
GB (1) GB2081514B (no)
GR (1) GR82313B (no)
HK (1) HK49385A (no)
IT (1) IT1137757B (no)
NO (1) NO153670C (no)
PH (1) PH17356A (no)
PT (1) PT73409B (no)
YU (1) YU40405B (no)
ZA (1) ZA815007B (no)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079483B1 (de) * 1981-11-10 1986-02-26 E.G.O. Elektro-Geräte Blanc u. Fischer Steuereinrichtung für Elektrokochplatte
DE3223417A1 (de) * 1982-06-23 1983-12-29 Karl 7519 Oberderdingen Fischer Elektrokochplatte
DE3226264A1 (de) * 1982-07-14 1984-01-19 Ego Elektro Blanc & Fischer Temperaturbegrenzer fuer elektroheiz- oder waermegeraete, insbesondere elektrokochplatten
DE8301364U1 (no) * 1982-07-07 1987-06-25 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
ZA834811B (en) * 1982-07-07 1984-03-28 Ego Elektro Blanc & Fischer Electric hotplate with a thermostat
DE3301219A1 (de) * 1983-01-15 1984-07-19 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochplatte
DE3315333A1 (de) * 1983-04-28 1984-10-31 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Kochgeraet mit mehreren elektrischen kochplatten
DE3425896A1 (de) * 1984-07-13 1986-01-23 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochplatte
DE3519035A1 (de) * 1985-05-25 1986-11-27 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektro-kochplatte
JPS62271386A (ja) * 1986-01-04 1987-11-25 カ−ル・ツワイス・ステイフツング ガラス−セラミツク系調理用レンジ
DE3617742A1 (de) * 1986-05-27 1987-12-03 Ego Elektro Blanc & Fischer Elektrokochplatte
DE8702227U1 (de) * 1987-02-13 1988-06-16 Pistor + Boss GmbH, 5880 Lüdenscheid Restwärmeanzeigevorrichtung
DE4004308A1 (de) * 1990-02-13 1991-08-14 Ego Elektro Blanc & Fischer Elektrokochplatte
DE4008830A1 (de) * 1990-03-20 1991-09-26 Ego Elektro Blanc & Fischer Elektrokochplatte
CN104465216B (zh) * 2014-12-10 2018-08-10 郭启强 一种密闭工作的压力行程开关
DE102021210399A1 (de) * 2021-09-20 2023-03-23 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für ein Kochfeld und Kochfeld mit einer solchen Heizeinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123059B (de) * 1958-12-24 1962-02-01 Karl Fischer Schutzschalter fuer elektrische Kochplatten
DE1615258A1 (de) * 1967-02-16 1970-07-23 Karl Fischer Elektrische Massekochplatte mit UEberhitzungsschutzschalter
DE2620004A1 (de) * 1976-05-06 1978-01-19 Karl Fischer Elektrokochplatte mit einem temperaturbegrenzer

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427945A (en) * 1942-12-05 1947-09-23 Westinghouse Electric Corp Electric hot plate with vesseltemperature control
DE1127007B (de) * 1958-03-28 1962-04-05 Karl Fischer Elektrisch beheizte Masse-Schnellkochplatte
AT214543B (no) * 1958-12-24 1961-04-10 Fischer Karl
NL296506A (no) * 1963-08-09 1965-05-10
CA959523A (en) * 1971-02-11 1974-12-17 Herbert T. Hazleton Bi-stable thermal relay
DE2343834A1 (de) * 1973-08-30 1975-04-10 Ego Elektro Blanc & Fischer Tamperaturbegrenzer
DE2422624C3 (de) * 1974-05-10 1978-05-11 Karl 7519 Oberderdingen Fischer Temperaturbegrenzer
DE2442873C2 (de) * 1974-09-06 1985-02-07 Karl 7519 Oberderdingen Fischer Leistungssteuergerät für Elektrokoch- oder wärmegeräte
US4135081A (en) * 1974-05-10 1979-01-16 Karl Fischer Electric cooking plate with a temperature limiter
DE2735426C3 (de) * 1977-08-05 1981-01-08 E.G.O. Elektro-Geraete Ag, Zug (Schweiz) Elektrokochplatte mit einem Temperaturbegrenzer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123059B (de) * 1958-12-24 1962-02-01 Karl Fischer Schutzschalter fuer elektrische Kochplatten
DE1615258A1 (de) * 1967-02-16 1970-07-23 Karl Fischer Elektrische Massekochplatte mit UEberhitzungsschutzschalter
DE2620004A1 (de) * 1976-05-06 1978-01-19 Karl Fischer Elektrokochplatte mit einem temperaturbegrenzer

Also Published As

Publication number Publication date
GR82313B (no) 1984-12-13
GB2081514B (en) 1984-09-26
PT73409A (de) 1981-08-01
US4386263A (en) 1983-05-31
FR2487622B3 (no) 1982-10-01
YU181981A (en) 1983-12-31
YU40405B (en) 1985-12-31
CA1173883A (en) 1984-09-04
FI69739B (fi) 1985-11-29
IT1137757B (it) 1986-09-10
NO812515L (no) 1982-01-25
JPS5752427A (en) 1982-03-27
DK325881A (da) 1982-01-25
PH17356A (en) 1984-08-01
DE3027998A1 (de) 1982-02-25
ATE7534T1 (de) 1984-06-15
GB2081514A (en) 1982-02-17
DE3163635D1 (en) 1984-06-20
ES259627U (es) 1982-03-16
PT73409B (en) 1982-08-25
CH654708A5 (de) 1986-02-28
IT8123100A0 (it) 1981-07-23
AU546489B2 (en) 1985-09-05
HK49385A (en) 1985-07-05
EP0045007A1 (de) 1982-02-03
NO153670B (no) 1986-01-20
AU7305381A (en) 1982-01-28
NO153670C (no) 1986-04-30
ZA815007B (en) 1982-07-28
FI812309L (fi) 1982-01-25
FI69739C (fi) 1986-03-10
FR2487622A1 (fr) 1982-01-29
JPS5935613B2 (ja) 1984-08-29

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