EP0146816A2 - Plaque de cuisson électrique - Google Patents

Plaque de cuisson électrique Download PDF

Info

Publication number
EP0146816A2
EP0146816A2 EP84114451A EP84114451A EP0146816A2 EP 0146816 A2 EP0146816 A2 EP 0146816A2 EP 84114451 A EP84114451 A EP 84114451A EP 84114451 A EP84114451 A EP 84114451A EP 0146816 A2 EP0146816 A2 EP 0146816A2
Authority
EP
European Patent Office
Prior art keywords
heating ring
end cover
central
plate body
zone
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
EP84114451A
Other languages
German (de)
English (en)
Other versions
EP0146816A3 (en
EP0146816B1 (fr
Inventor
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 AT84114451T priority Critical patent/ATE54236T1/de
Publication of EP0146816A2 publication Critical patent/EP0146816A2/fr
Publication of EP0146816A3 publication Critical patent/EP0146816A3/de
Application granted granted Critical
Publication of EP0146816B1 publication Critical patent/EP0146816B1/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
    • 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 plate body and an end cover covering the lower side thereof at least in the region of a heating ring zone having a heating element, which lies against a heating ring flange of the plate body which delimits the heating ring zone on the inner circumference and separates it from a heating element-free central zone and with, for example, a screw trained, fastener is attached to the plate body, a downwardly projecting receptacle is provided in the region of the central zone on the underside of the plate body for the engagement of a threaded clamping member to be used when fastening the hotplate to a hob or the like.
  • the end cover is fitted onto a threaded mandrel projecting over the underside of the plate body and clamped against the underside of the plate body with a threaded nut screwed onto this threaded mandrel.
  • the one at the The underside of the plate body protruding section of the external thread mandrel serves as a receptacle for the engagement of a further nut, which is to be screwed onto the threaded mandrel by means of a bracket as a tensioning element when fastening the hotplate to a hob or the like.
  • the protruding threaded mandrel results in a relatively large one Overall height of the electric hotplate even before it is installed in the stove, which means that a lot of space is required when stacking the same or similar electric hotplates.
  • the above-mentioned threaded mandrel means that the electric hotplate is also relatively unwieldy during installation in a stove, and the threaded mandrel generally stands after installation relatively far down over the nut provided as a tendon.
  • the invention is based on the object of designing an electric hotplate of the type mentioned in such a way that the overall height of the electric hotplate can be reduced in a simple manner, in particular in the state prior to its installation in a stove or the like, and thus also achieves good stackability with little space requirement becomes.
  • the members for fastening the hotplate to the stove or the like should be able to be separated from the fastening of the end cover in such a way that there is a simple construction and in particular simple assembly, e.g. should be possible to loosen the end cover or remove it from the plate body when the electric hotplate is installed in a stove or the like. Without having to loosen the fastening of the plate body on the stove.
  • the object on which the invention is based is achieved in the case of an electric hotplate of the type mentioned at the outset according to the invention in that the end cover is fastened with at least two spaced-apart fastening members which act directly on the inner heating ring flange and in that the receptacle for the tendon is provided by an exposed one , threaded bore accessible from below is formed in a central eye of the plate body projecting above the underside of the central zone.
  • an internal thread is provided as a receptacle for the tendon to be used when attaching the hotplate to a hob or the like, which takes up a considerably lower overall height, for example in such a way that the middle eye does not protrude beyond the lowest level of the remaining plate body.
  • a nut is not necessarily required as a tendon, but head screws of suitable length and with any head shape for the respective application, as well as threaded bolts, can be used, whereby the length of the tendon and its material are only taken into account during installation, taking into account the installation conditions can be chosen. If the end cover is only fastened to the plate body by the fastening members and is sufficiently large in the area of the imaginary extension of the threaded hole, the end cover can also be loosened if the electric hotplate is in the installed state.
  • the inner heating ring flange expediently has two, in particular diametrically opposed, threaded bores for the engagement of two fastening screws, it preferably being thickened in the area of the threaded bores essentially exclusively radially inwards towards the central axis of the plate body, so that there is no additional for these eyes Space requirement results.
  • the contact surfaces against which the end cover rests on the inner heating ring flange in the area of the fastening members are at least approximately in the plane of the lower end face of the remaining inner heating ring flange projecting over the heating ring zone, so that the end cover with a simple design over the whole Circumferentially close to the inner heating ring flange.
  • these contact surfaces stand back from the end surface of the middle eye, which for example extends approximately to the level of the lower end face of an outer heating ring flange.
  • the head or the like is at least one fastening element as a counter-element for engaging an anti-rotation device of the hotplate formed over the hob or the like.
  • the fastening member has an elongated head, reaching almost to the lowest level of the plate body, such as a screw head, which expediently does not have the lowest level of the plate body protrudes.
  • the design according to the invention it is advantageously possible to cover the central zone of the hotplate without a cover, in particular if it is not provided with a so-called protector, i.e. an overheating safety switch, i.e. release.
  • a so-called protector i.e. an overheating safety switch, i.e. release.
  • the end cover has a central part covering the central zone, in particular provided with ventilation openings, which is recessed in the area of the threaded bore for the tendon and instead of surrounding the central eye on the circumference, preferably freely on the end face of the central eye is present.
  • This design is particularly suitable for protectingly accommodating a protector between the underside of the central zone and the central part of the end cover.
  • the middle part can be formed in one piece with the rest of the end cover in a simple manner.
  • the middle part of the end cover is formed by a component separate from the outer part, the two components overlapping one another at least in the region of the fastening members and being clamped with the same fastening members against the inner heating ring flange, so that both components with one and the same fastening members attached and secured against rotation about the central axis of the plate body.
  • the design according to the invention it is also possible to arrange an earthing lug between the head of a fastening element and the end cover for secure electrical earthing of the hotplate. Furthermore, a separate anti-rotation lock of the end cover relative to the plate body is not required.
  • the configuration of the heating ring zone of the plate body and thus the production of this heating ring zone are not influenced by the design according to the invention.
  • the end cover can be designed in a simple manner as a sheet metal cover and / or as a stamped part.
  • an electric hotplate which has a hotplate body 1 made of cast iron with an upper flat and closed cooking surface 2.
  • the unheated middle zone 3 is lowered so that an annular cooking surface is created.
  • the plate body 1 overlaps on its outer circumference via an upper case edge 4 made of sheet material of essentially U-shaped cross section, which is supported on the raised opening edge of the worktop of an electric cooker or hob.
  • the plate body 1 is provided on the underside with spirally extending ribs, which likewise form spiral grooves 6 between them, in which heating coils 7 lie in a ceramic investment material 8.
  • the radially innermost groove 6 with respect to the central axis 9 of the plate body 1 is delimited on its inner circumference by an inner heating ring flange 10, which over most of its circumference is similar in cross section to the ribs between the other grooves 6, but opposite these ribs has a greater height, such that its lower End face 11 is lower than the lower end faces of the ribs 12 lying in a common plane.
  • the inner heating ring flange 10 delimits the radiator-free closed central zone 3 on the outer circumference. In the case of the arrangement of a heat sensor, the plate body 1 is broken through in the area of the central zone 3 for receiving this heat sensor.
  • the radially outermost groove 6 is delimited on its outer circumference by an outer heating ring flange 13, which is located at a short distance adjacent to the largest circumference of the plate body 1 and is higher than the inner heating ring flange 10, in such a way that it is the lowest boundary plane of the plate body 1 or the Electric hotplate forms.
  • the inner heating ring flange 10 is thickened at two points diametrically opposite one another with respect to the central axis 9 at 14, these thickenings being created in that the cross section of the inner heating ring flange 10 is widened exclusively towards the central axis 9 in such a way that the outer flank of the heating ring flange forming the side surface of the associated innermost groove 6 also runs continuously in the region of the eyes 14, in the exemplary embodiment shown being circular or approximately cylindrical.
  • each eye 14 there is an internal thread 15 parallel to the central axis 9, which is formed by a threaded blind hole and is open on the underside of the heating ring flange 10.
  • the central zone 3 has on the underside a central eye 16 which is formed in one piece with the rest of the plate body 1 and lies in the central axis 9 and whose lower end surface 17 is at right angles to the central axis 9 extends to the level of the lower end face of the outer heating ring flange 13 or is only slightly upward relative to this.
  • a receptacle 18 for a tendon which does not belong to the hotplate before installation is in the form of a threaded bore which is designed as a blind hole and is open in the end face 17.
  • the receptacle 18 can be provided with an already cut thread or, when using a self-tapping screw, can be designed as a tensioning element as a smooth blind hole.
  • the underside of the heating ring zone 5 of the plate body 1 is essentially hermetically sealed with an annular end cover 20.
  • the end cover 20 for example made of sheet metal and profiled for stiffening in cross section, lies at a distance only below the underside of the heating ring zone 5 formed by the lower end faces of the ribs 12 and only projects with its material thickness down over the lower end face of the outer heating ring flange 13.
  • the diameter of the inner opening 19 of the end cover 20 corresponds approximately to the inner diameter of the inner heating ring flange 10 or the clear distance between the eyes 14.
  • the end cover 20 In the region of the inner heating ring flange 10, the end cover 20 has an inner flat annular flange edge 21, which on the lower end faces the eyes 14 and on the lower end face 11 of the rest of the heating ring flange 10 rests essentially over the entire surface. In the area of the outer circumference, the end cover 20 also has an outer annular flat flange edge 22 which is considerably narrower than the inner flange edge 21 and bears over the entire circumference on the lower end face of the outer heating ring flange 13. This outer flange edge can also be designed such that it lies adjacent to the inner flank of the heating ring flange 13 on the underside of the heating zone 5.
  • the end cover 20 is profiled twice in a meandering cross-section, this profiled zone being set back slightly upwards relative to the underside of the outer flange edge 22.
  • the inner flange edge 21 of the end cover 20 has a through opening for one fastening member 23 each, which in the exemplary embodiment shown is formed by a cap screw whose, for example, slotted cylinder head rests on the underside of the inner flange edge 21 and with which the end cover 20 is stretched against the underside of the plate body 1.
  • the inner opening 19 of the end cover 20 is several times larger in diameter or in width than the outer diameter of the central eye 16, so that the end cover 20 can also be removed at any time after loosening the fastening members 23, if the electric hotplate is installed in a stove or the like.
  • the end cover 20a has an otherwise identical design of the plate body 1 a, in contrast, a central part 25, which integrally merges with the other end cover 20 a over the inner flange edge 21 a.
  • the middle part 25 covers the middle zone 3a and the middle eye 16a on the underside, with its lower flat end wall resting against the lower end face 17a of the middle eye 16a.
  • a through opening 26 lying approximately in the central axis 9a of the receptacle 18a, the diameter or width of which is larger than the outside diameter of the receptacle 18a, that is to say the thread forming it, and smaller than the outside diameter of the middle eye 16a in the region of the through hole lower end surface 17a.
  • the fastening members 23a have elongated cylindrical heads 24a, the lower, slotted end faces of which extend approximately to the lowest level of the plate body 1a.
  • These heads 24a which can also be provided in the other embodiments according to the invention, can, like the heads 24, be provided for engaging an anti-rotation lock of the hotplate with respect to the hob or the like.
  • FIGS. 4 to 7 parts that correspond to one another have the same reference numerals as in FIGS. 1 to 3, but in FIGS. 4 to 6 with the index “b”, in FIG. 7 with “c” and in FIGS. 8 and 9 used with "d".
  • the end cover 20b is formed by two separate components 25b, 27, of which the outer component 27 covers the heating ring zone, while the inner component 25b is provided as a central part for covering the underside of the central zone 3b.
  • the central part 25b overlaps with flange projections 29 of an outer flange edge 28 projecting outwards, inner flange projections 21b of an inner flange edge 30 of the outer component 27 on the underside, the respective flange projections lying one above the other having substantially congruent through holes for the fastening members 23b and with these are stretched together against the undersides of the eyes 14.
  • the outer flange edge 28 of the middle part 25b is essentially flat in the form of an annular disk with a diameter which corresponds to the diameter of the lower end face of the inner heating king flange 10b and is almost congruent with this.
  • the inner flange edge 30 of the outer component 27 is angled upward in cross section in such a way that it engages over the inner heating ring flange 10b adjacent to its abutment on the inner circumferential surface, centering on its lower end face.
  • the flange edge 28 lies between the eyes 14b in an exciting manner on the underside of the flange edge 30.
  • the central part 25b is cross-shaped in the view according to FIG. 4, in such a way that there are large ventilation openings between the cross arms for ventilation of the underside of the central zone. Only two cross arms aligned with one another are fastened with the fastening members 23b, while the two other cross arms each form one of the flange edges 28 at their outer ends. Similarly, the central part 25 according to FIG. 3 can be broken through by cutouts or perforations for ventilation of the underside of the central zone 3a.
  • the central part 25 or 25b or the central part 25c according to FIG. 7 is provided in particular when a protector 31 is arranged on the underside of the central zone. This protector 31 is then clamped, for example, with the central part 25c against the underside of the central zone 3c.
  • the middle part 25c according to FIG. 7 has an outer ring part 32, which is closed over the circumference, and an inner ring part 33, which is evenly distributed over several parts in the embodiment shown Circumferentially distributed arm-like sections 34 are connected in one piece in such a way that relatively large openings for ventilation of the underside of the central zone remain free.
  • the central part 25c of the end cover has depressions 35 on the underside, which are suitable as counter-members for engaging an anti-rotation device for the hotplate relative to the hob or the like.
  • FIGS. 8 and 9 show an embodiment in which only an arm-like, somewhat resilient section 34d is provided in the form of a strip-shaped tab, which can be clamped via an opening 26d on the middle eye 16d by a bolt 48 with nut 49 from there protrudes radially outward on one side and connects integrally via an upward bend to the end cover 20 d, which is screwed onto the hotplate body 1 d via the screws 24 d, which are arranged symmetrically to section 34 d.
  • an upward-directed shape 50 is formed, which presses on a temperature limiter (protector) 31d or its switching head, which is arranged between the section and the hotplate body 1d in the region of the unheated central zone 3d, and fixes this under spring tension.
  • the temperature limiter is thereby pressed securely and with reproducible heat coupling to the hotplate body, the assembly is simple and the protector is well ventilated so that it is not exposed to heat build-up.
  • the end cover 20d is centered on the hotplate body 1d via an upward bend 51 of the end cover which engages in the inner edge 10d.

Landscapes

  • Cookers (AREA)
  • Electric Stoves And Ranges (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Table Devices Or Equipment (AREA)
  • Insulated Conductors (AREA)
  • Baking, Grill, Roasting (AREA)
  • Resistance Heating (AREA)
  • Glass Compositions (AREA)
  • Surgical Instruments (AREA)
EP84114451A 1983-12-03 1984-11-29 Plaque de cuisson électrique Expired - Lifetime EP0146816B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114451T ATE54236T1 (de) 1983-12-03 1984-11-29 Elektrokochplatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19838334727U DE8334727U1 (de) 1983-12-03 1983-12-03 Elektrokochplatte
DE8334727U 1983-12-03

Publications (3)

Publication Number Publication Date
EP0146816A2 true EP0146816A2 (fr) 1985-07-03
EP0146816A3 EP0146816A3 (en) 1986-04-30
EP0146816B1 EP0146816B1 (fr) 1990-06-27

Family

ID=6759507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114451A Expired - Lifetime EP0146816B1 (fr) 1983-12-03 1984-11-29 Plaque de cuisson électrique

Country Status (5)

Country Link
EP (1) EP0146816B1 (fr)
AT (1) ATE54236T1 (fr)
DE (2) DE8334727U1 (fr)
ES (1) ES283113Y (fr)
YU (1) YU45911B (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR879795A (fr) * 1942-02-28 1943-03-04 Cie Parisienne De Distrib D El Perfectionnements aux foyers de cuisson électriques
DE7612737U1 (de) * 1975-04-25 1976-10-14 Fischer, Karl, 7519 Oberderdingen Elektrokochplatte

Also Published As

Publication number Publication date
DE8334727U1 (de) 1984-04-19
ES283113Y (es) 1986-09-01
YU205084A (en) 1986-10-31
EP0146816A3 (en) 1986-04-30
EP0146816B1 (fr) 1990-06-27
DE3482616D1 (de) 1990-08-02
ES283113U (es) 1986-02-01
YU45911B (sh) 1992-09-07
ATE54236T1 (de) 1990-07-15

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