EP0235680A2 - Plaque de cuisson électrique - Google Patents

Plaque de cuisson électrique Download PDF

Info

Publication number
EP0235680A2
EP0235680A2 EP87102332A EP87102332A EP0235680A2 EP 0235680 A2 EP0235680 A2 EP 0235680A2 EP 87102332 A EP87102332 A EP 87102332A EP 87102332 A EP87102332 A EP 87102332A EP 0235680 A2 EP0235680 A2 EP 0235680A2
Authority
EP
European Patent Office
Prior art keywords
housing
hotplate
underside
temperature sensor
temperature limiter
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
EP87102332A
Other languages
German (de)
English (en)
Other versions
EP0235680A3 (en
EP0235680B1 (fr
Inventor
Robert Kicherer
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
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 EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT87102332T priority Critical patent/ATE76242T1/de
Publication of EP0235680A2 publication Critical patent/EP0235680A2/fr
Publication of EP0235680A3 publication Critical patent/EP0235680A3/de
Application granted granted Critical
Publication of EP0235680B1 publication Critical patent/EP0235680B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/70—Plates of cast metal

Definitions

  • the invention relates to an electric hotplate with a hotplate body which is provided on its underside facing away from the cooking surface with at least one heating resistor embedded in an insulating compound and with a temperature limiter which has a housing in the central zone of the hotplate body with a switch and an actuator acting thereon. Has rod-shaped temperature sensors protruding above the housing in the area of the heating resistor.
  • the housing of the temperature sensor of such electric hot plates provided as a base for the switch parts consists of an electrically insulating material which, due to the very high temperature loads, must also be of very high quality and is usually a ceramic material. This material is problematic in terms of shape and also expensive.
  • the housing of the temperature limiter is essentially closed except for the passage of the temperature sensor and of connecting lugs, with the mounting side of the housing usually being closed a flat cover which is fastened, for example, by a rivet.
  • this design of the temperature limiter is too expensive and the ventilation of the housing is too low. If the housing cover lies on the underside of the housing, it can fall down onto a cover on the underside of the hotplate body if it is damaged and interfere there.
  • the invention has for its object to provide an electric hotplate of the type mentioned, which ensures an improved and simplified manufacture of the temperature limiter.
  • the housing of the temperature limiter is open at the top and that this open side lies at a distance below the bottom of the hotplate body.
  • the housing of the temperature limiter therefore does not require a cover, so that it can be manufactured continuously and completely in one piece. Since its open side is at a distance from the hotplate body, it is well ventilated and no moisture can accumulate in the housing.
  • the housing can be made more compact by this design, so that it takes up less space.
  • the housing has protruding spacers, in particular frustoconical projections, with which it rests on the underside of the hotplate body.
  • the relatively long temperature sensor can also be aligned in a surprisingly simple manner the hotplate body can be achieved.
  • the exposed area of the housing can thereby be kept relatively large.
  • the underside of the hotplate body in cross-section in the area of the housing of the temperature limiter in particular from a downwardly projecting central pin to a downwardly projecting inner flange ring which limits the area of the heating resistor on the inner circumference, increases radially outwards, in which case at least one spacer closer to the temperature sensor is advantageously higher than at least one spacer further away from it, so that despite increasing contact surface of the hotplate body, an alignment of the housing or the temperature sensor parallel to its cooking surface is particularly easy is possible.
  • a particularly safe and wobble-free contact of the housing of the temperature limiter on the hotplate body can be achieved if at least three spacers are provided in a further embodiment of the invention, two of which are preferably located on either side of the inner end of the temperature sensor and one approximately in the extension of the temperature sensor.
  • the last-mentioned spacer ensures an exact alignment of the temperature sensor expediently protruding radially outwards with respect to the central axis of the hotplate body, which extends approximately over the entire annular zone, in which heating resistors are provided, for example, in grooves surrounding the central axis of the hotplate body and the lies between the inner flange ring and an outer flange ring of the hotplate body which projects further downward.
  • the housing of the temperature limiter preferably with rounded corner areas, resting against the inner circumference of the inner flange ring of the hotplate body.
  • the housing of the temperature limiter is also precisely fixed against radial movements relative to the hotplate body.
  • the associated spacers can also be located in these corner areas.
  • the housing of the temperature limiter receives a special, precisely defined system on the inner flange ring if the radius of curvature of the respective rounded corner area of the housing is less than half of its width measured in the longitudinal direction of the temperature sensor.
  • the open side of the housing of the temperature limiter is formed by a flat side of the housing and preferably forms its mounting opening for the switch used by this side, in particular a snap switch.
  • the open side also forms the mounting opening for the temperature sensor, so that all functional or working parts of the temperature limiter can be installed by simply plugging in from this open side.
  • the arrangement can be such that the assembled parts are secured essentially only by their internal stress and by the contact of the movable part of the temperature sensor on the snap switch with respect to the housing.
  • the design according to the invention is particularly suitable for those temperature limiters in which the temperature sensor is formed by an outer tube provided as an expansion tube and an inner rod arranged therein with a different, in particular very low, expansion coefficient.
  • the outer tube can be very securely on the Ge housing if a flange plate is fastened to its inner end with a molded sleeve, which preferably surrounds the inner end of the outer tube between an end collar and an upset flange ring.
  • thermocoupling of the temperature limiter to the hotplate can also be improved by the design according to the invention.
  • the temperature limiter is resiliently pressed against the underside of the hotplate body, a lower cover of the hotplate body preferably being a spring member which rests on the underside of the housing of the temperature limiter, such as a shaped spring clip or the like. having.
  • an electric hotplate 1 has a hotplate body 2 made of cast material, in particular circular, the flat top surface of which is provided with a recess 6 in the center forms the cooking surface 3 of the electric hotplate 1 and which is adjacent on its underside an outer flange ring 4 which extends approximately up to the cooking surface 3 has an outer flange ring 4 and, in the vicinity of the recess 6, has an inner flange ring 5 which projects less far downward.
  • heating resistors 9 are provided on the underside of the hotplate body, which are arranged in grooves which are curved spirally about the central axis 8 and are separated from one another by correspondingly spiraling webs and are embedded in an insulating compound.
  • the inner one The flange ring protrudes slightly downwards from the underside of the vertical webs and thus the insulating compound.
  • the underside of the hotplate body 3 is or the like with a cover 11 in the form of a flat metal cover. essentially closed, this cover 11 abutting the lower end face of the flange ring 4 and the underside of a central pin 12.
  • the central pin 12 provided in the central axis 8 delimits with the inner flange ring 5 an annular space provided within the heating resistors 9 on the underside of the hotplate body 2 and projects further downward from the flange ring, namely preferably as far as the outer flange ring 4.
  • the center pin 12 is provided with a threaded bore, with which the electric hotplate is fixed in the hob and the cover 11 can be stretched against the underside of the hotplate body 2.
  • Said annular space is delimited on the upper side by the approximately constant thickness of the bottom wall of the recess 6, which on the underside has a concave fillet that adjoins the circumferential surface of the central pin 12 and rises radially outwards at a few degrees, for example approximately 10 °, forms annular surface 13 which merges into the inner circumferential surface of the flange ring 5 via a corresponding concave fillet.
  • a temperature limiter 14 which has a housing 15 made of steatite in the said annular space and a rod which projects freely outwards and radially to the central axis 8 Migen temperature sensor 16, which lies at a short distance below the spiral webs of the hotplate body or the insulating material receiving the heating resistors 9 and has a constant distance from them over its length.
  • the temperature sensor 16 extends almost to the inner circumference of the outer flange ring 4 and can be arranged in a contactless manner with respect to the inner flange ring 5.
  • the lengthwise rectangular case 15, which is flatter in side view compared to its width, lies approximately tangentially to the central pin 12 with its elongation, its upper side 17 parallel to the cooking surface 3 or to the temperature sensor 16 being a short distance below the surface 13 of the hotplate body 2 lies that between this side 17 and the surface 13 a gap widening in cross section to the flange ring 5 is formed.
  • the housing 15 has on its top in one piece with it, upwardly frustoconical protruding spacers 18, 19, which project to different extents from the upper side 17 and rest with their upper end faces on the surface 13 of the hotplate body 2.
  • the arrangement is expediently such that the housing 15 with its associated corner regions rests on the inner circumference 21 of the inner flange ring 5 on both sides of the temperature sensor 16.
  • these corner regions 20 are rounded with a quarter circle in the form of a radius of curvature which is smaller than half of the edge dimension of the housing 15 measured in the longitudinal direction of the temperature sensor 16.
  • the housing 15 On its side facing away from the temperature sensor 16, that is to say on the side facing the central pin 12, the housing 15 has the electrical connections for the temperature limiter 14 in the form of connecting lugs 22 which protrude beyond the associated side of the housing 15 and, for example, on both sides of the temperature sensor 16 placed axial plane the hotplate body 2 lie.
  • a spring member 23 which can be formed, for example, by a design which is formed in one piece with the cover 11 and projects upwards therefrom and the housing 15 against the surface 13 of the hotplate body 2 presses.
  • the housing 15 of the temperature limiter 14 is provided with a recess 24, which is essentially limited on all sides, for the completely recessed mounting of the switch parts of a snap switch 25, the shape of which is exclusively on the upper side 17 on it full remaining width open recess 24 is adapted.
  • the switch 25 has a snap contact 26 carried by a snap spring 27, to which a contact fixed to the housing is assigned as the mating contact 28.
  • the inner end of an inner rod 29 of the essentially cylindrical rod-shaped temperature sensor 16 acts on a pressure point of the snap spring 27.
  • the cylindrical inner rod 29 is arranged with little radial play in an outer tube 30 provided as an expansion tube of relatively high expansion coefficient, the inner end of which is fixed in position on the housing 15 is attached and the free end of which carries an adjusting member 31 in the form of an adjusting screw on which the associated outer end of the inner rod 29 is supported.
  • the inner end of the inner rod 29 projects from the inner end of the outer tube 30 and lies in a groove extending to the recess 24 in the upper side 17 of the housing 15.
  • the connecting lug 22 associated with the snap contact 26 is formed by a leg of a contact carrier, which in slot-shaped depressions of the housing 15 is inserted from its upper side 17.
  • the mating contact 28 with its multi-angled connecting lug 22 is inserted into a slot-shaped opening 15 from the upper side 17.
  • the outer tube 30 of the temperature sensor 16 has at the inner end an elongated rectangular flange plate 33 projecting on all sides over its outer circumference, which is penetrated by the outer tube 30 such that the outer tube 30 on the associated side of the flange plate 33 with one formed by its end , Outwardly shaped annular collar 34 abuts and is attached.
  • the flange plate 33 which can be curved in one or two planes in the relaxed state, engages with its longer ends in slots 35 of the housing 15, which connect on both sides to the side surfaces of the groove 32. In these slots 35, the flange plate 33 is secured by its resilient internal stress. Adjacent to the slots 35, the outer tube 33 of the temperature sensor 16 lies essentially without contact in the groove 32, in such a way that it projects freely over the associated longitudinal side of the housing 15 connecting the rounded corner regions 20.
  • Two spacers 18 of larger diameter and of substantially the same size are provided on either side of the temperature sensor 16 in the vicinity or in the area of a corner region 20, a spacer 18 directly adjoining the associated corner region 20 reaching approximately to the adjacent slot 35, while that another spacer 18 lies essentially between the adjacent slot 35 and the adjacent corner region 20.
  • the upper end faces of these two spacers 18 lie in a common plane perpendicular to the temperature sensor 16.
  • the third spacer 19, which is substantially smaller in diameter, lies essentially in an axial plane of the temperature sensor 16 and with respect to the spacers 18 on the other side of the recess 24 between the connecting lugs 22, such that this spacer is also outside the recess 24 or directly is provided adjacent to this.
  • the flange plate 33a has a tubular sleeve 36 formed in one piece with it, the length of which is only about half the diameter and which closely surrounds the inner end of the outer tube 30a.
  • the outer tube 30a With a distance from the end collar 34a adapted to the length of the sleeve 36, the outer tube 30a has an annular collar projecting over its outer circumference approximately by the wall thickness of the sleeve 36 and formed in one piece with it, which is formed by an upset flange ring 37, in the area of which the Wall of the outer tube 30a in the manner of a fold is U-shaped twice on top of each other.
  • the flange plate 33a is curved about an axis lying transversely to its longitudinal direction in such a way that it lies directly adjacent to the sleeve 36 on the boundary edges adjoining the groove 32a of the side surfaces of the slots 35a closer to the outer end of the temperature sensor 16a.
  • the flange plate is at least in the region of its ends at a right angle or parallel to it. Axis lying in the longitudinal direction is curved in such a way that it only rests on the opposite sides of the slots 35a with its corner regions.
  • FIGS. 5 and 6 the same reference numerals are used for corresponding parts as in FIGS. 1 and 2, but with the index "b".
  • temperature limiter 14b in particular its switch housing which bears against the underside of hotplate body 2b with spacers 18b, 19b, is exposed to very good ventilation, so that heat build-up in the area of the switch housing is completely avoided can, while the temperature sensor 16b is arranged well covered between the cover 11b and the underside of the hotplate body 2b.
  • the cover 11b has in the center an opening 39, approximately circular in the embodiment shown, in the form of an opening, from the edge region of which a tongue-shaped spring element 23b, which is approximately radial to the central pin 12b and protrudes in one piece with the cover 11b, projects.
  • This spring member 23b only extends to the central pin 12b, rests on the underside thereof, is penetrated by the threaded bolt 38 inserted in the central pin 12b and is tensioned against the underside of the central pin by a nut screwed onto the threaded bolt 38.
  • the spring member 23b lying essentially parallel to the underside of the switch housing of the temperature limiter 14b at a short distance from this underside approximately in the plane of the lower end face of the outer flange ring 4b passes at its radially outer end via an approximately right-angled offset into the delimitation of the opening 39, this offset being located immediately adjacent to the side of the switch housing from which the temperature sensor 16b protrudes outwards.
  • the width of the spring member 23b is substantially smaller than the longitudinal extent of the housing 15b of the temperature limiter 14b measured parallel thereto, the spring member 23b lying approximately in the middle of this longitudinal extent.
  • the cover 11b forms an approximately closed annular groove around the central axis 8b by channel-shaped embossing, the bottom wall of this annular groove being supported on the lower end face of the inner flange ring 5b.
  • a radial slot 42 is provided, the width and depth of which are in each case the same or only slightly greater than the diameter of the temperature sensor 16b, so that the relatively short section directly adjoining the housing 15b laterally and in the Height center can engage in this slot 42.
  • the housing 15b of the temperature limiter 14b is covered exclusively by the spring member 23b, while it is completely exposed on both sides of this spring member 23b and extends approximately to the limit of the opening 39.
  • the cover 11b is additionally fixed with respect to the hotplate body 2b, except in the area of the central pin 12b.
  • two screws 40 diametrically opposite each other on both sides of the spring member 23b are provided directly adjacent to the delimitation of the opening 39, which are screwed from below into corresponding threaded bores of eye-like widenings of the inner flange ring 5b.
  • the tab-shaped spring member 23b carries between its ends an upwardly projecting cam 41 in the form of an expression which essentially forms the only contact of the spring member 23b on the underside of the housing 15b of the temperature limiter 14b.
  • the cam 41 is expediently arranged in the region of a switch button of the temperature limiter 14b, so that it presses against it and fixes it under resilient pretension. The As a result, the temperature limiter is pressed securely onto the hotplate body 2b with reproducible heat coupling, and assembly is simple.

Landscapes

  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Electric Stoves And Ranges (AREA)
  • General Induction Heating (AREA)
  • Massaging Devices (AREA)
  • Thermally Actuated Switches (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Table Devices Or Equipment (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP87102332A 1986-03-01 1987-02-19 Plaque de cuisson électrique Expired - Lifetime EP0235680B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87102332T ATE76242T1 (de) 1986-03-01 1987-02-19 Elektrokochplatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606794 1986-03-01
DE19863606794 DE3606794A1 (de) 1986-03-01 1986-03-01 Elektrokochplatte

Publications (3)

Publication Number Publication Date
EP0235680A2 true EP0235680A2 (fr) 1987-09-09
EP0235680A3 EP0235680A3 (en) 1988-03-02
EP0235680B1 EP0235680B1 (fr) 1992-05-13

Family

ID=6295315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102332A Expired - Lifetime EP0235680B1 (fr) 1986-03-01 1987-02-19 Plaque de cuisson électrique

Country Status (8)

Country Link
US (1) US4754123A (fr)
EP (1) EP0235680B1 (fr)
JP (1) JPS62208590A (fr)
AT (1) ATE76242T1 (fr)
AU (1) AU598795B2 (fr)
DE (2) DE3606794A1 (fr)
ES (1) ES2032764T3 (fr)
YU (1) YU30287A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338285A1 (fr) * 1988-04-20 1989-10-25 E.G.O. Elektro-Geräte Blanc u. Fischer Plaque de cuisson électrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018212094A1 (de) * 2018-07-19 2020-01-23 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für ein Kochfeld und Kochfeld

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8103514U1 (de) * 1981-06-25 Fischer, Karl, 7519 Oberderdingen Temperaturempfindlicher Schalter, insbesondere für eine Signaleinrichtung an Kochgeräten
EP0100861A2 (fr) * 1982-07-07 1984-02-22 E.G.O. Elektro-Geräte Blanc u. Fischer Réchaud électrique comportant un disjoncteur de protection de température

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU515663B2 (en) * 1974-05-10 1981-04-16 Karl Fischer Temperature limiter
US4135081A (en) * 1974-05-10 1979-01-16 Karl Fischer Electric cooking plate with a temperature limiter
FR2369674A1 (fr) * 1977-12-13 1978-05-26 Snipeliski Jacques Perfectionnements aux dispositifs d'interrupteurs thermostatiques
DE2901801A1 (de) * 1979-01-18 1980-07-31 Ego Regeltech Temperaturmelder zur anzeige des temperaturzustandes einer glaskeramikkochflaeche
DD156060A3 (de) * 1981-02-04 1982-07-28 Horst Hase Schutzvorrichtung vor uebertemperatur bei elektrisch beheizten geschlossenen kochplatten
ZA834811B (en) * 1982-07-07 1984-03-28 Ego Elektro Blanc & Fischer Electric hotplate with a thermostat
DE3301689A1 (de) * 1983-01-20 1984-07-26 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochplatte
DE3410442A1 (de) * 1983-09-17 1985-09-26 Ego Elektro Blanc & Fischer Temperaturfuehler, insbesondere fuer einen temperaturbegrenzer fuer eine glaskeramik-kocheinheit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8103514U1 (de) * 1981-06-25 Fischer, Karl, 7519 Oberderdingen Temperaturempfindlicher Schalter, insbesondere für eine Signaleinrichtung an Kochgeräten
EP0100861A2 (fr) * 1982-07-07 1984-02-22 E.G.O. Elektro-Geräte Blanc u. Fischer Réchaud électrique comportant un disjoncteur de protection de température

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338285A1 (fr) * 1988-04-20 1989-10-25 E.G.O. Elektro-Geräte Blanc u. Fischer Plaque de cuisson électrique

Also Published As

Publication number Publication date
AU598795B2 (en) 1990-07-05
ATE76242T1 (de) 1992-05-15
AU6956587A (en) 1987-09-03
ES2032764T3 (es) 1993-03-01
US4754123A (en) 1988-06-28
DE3778930D1 (de) 1992-06-17
YU30287A (en) 1989-04-30
EP0235680A3 (en) 1988-03-02
DE3606794A1 (de) 1987-09-03
EP0235680B1 (fr) 1992-05-13
JPS62208590A (ja) 1987-09-12

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