US3870863A - Electrical heating element for bread toaster or the like - Google Patents

Electrical heating element for bread toaster or the like Download PDF

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Publication number
US3870863A
US3870863A US339915A US33991573A US3870863A US 3870863 A US3870863 A US 3870863A US 339915 A US339915 A US 339915A US 33991573 A US33991573 A US 33991573A US 3870863 A US3870863 A US 3870863A
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United States
Prior art keywords
spaced
insulating support
heating element
heating conductor
conductor
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Expired - Lifetime
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US339915A
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English (en)
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Helmut Ohnmacht
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Individual
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Individual
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/06—Roasters; Grills; Sandwich grills
    • A47J37/08—Bread-toasters
    • A47J37/0814—Bread-toasters with automatic bread ejection or timing means
    • 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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base

Definitions

  • the heating conductor consists of a wire wound on a core of low thermal expansion coefficient.
  • the conductor is carried by a frame including opposite support strips between which the conductor is strung in loops without intermediate support.
  • the core consists of twisted threads of mineral fiber.
  • the invention relates to a heating element for bread toasters or the like, having a support on which the heating conductor is arranged in a plurality of loops.
  • both known heating elements operate satisfactorily they both have the disadvantage of comparatively high material and manufacturing cost.
  • the material costs are considerably influenced by the fact that each heating element has an insulating plate appropriate to the toasting area.
  • the costs of the additional supporting strips of insulating material are determined by considerable punching work required at the insulating material panels and also by the fact tht up to the present time it has in practice not been possible to develop a winding machine for winding the heating consuctor wire which operates in a satisfactory manner with an acceptable cost level, for which reason hand winding is much cheaper even at the present day and even when producing large numbers of items.
  • the heating element comprises a heating conductor which consists of a heating conductor wire wound on a core having a low coefficient of thermal expansion and is strung out freely in a plurality of loops between two insulating conductor support strips situated opposite one another and forming part of a frame which supports the heating conductor and is adapted in its external dimensions to the food to be toasted.
  • the core of the heating conductor is preferably made of twisted threads consisting of mineral fibre, on which the heating conductor wire is helically wound.
  • a heating conductor constructed in this way can be made to extend in self-supporting manner over relatively considerable lengths without sagging when heated, since the core has only slight thermal expansion and the wound heating conductor wire will at the most be slightly increased in its coil diameter.
  • Heating conductor wires of any diameter can be used, more especially with the advantageous small diameter of the first mentioned conventional constructional form with the consequence of shortening the heating-up time. Owing to the properties of the heating conductor described, it is sufficient to support it simply by frame members so that the conventional plates can be omitted, likewise the central fixing strips of insulating material which have hitherto been provided, so that there is a considerable saving in material. Furthermore the use of eyelets or rivets to secure the heating conductor is no longer required, so that manufacturing costs can be reduced there also.
  • a further surprising advantage of the heating element provided by the invention is that in bread toasters having two toasting compartments only one central heating element is required, since owing to the frame-shaped 3 construction of the support the heating conductor radiates at the same time to both sides. This also means that for bread toasters having more than one toasting compartment all three heating elements areofthe same form, so that there is a simplification in manufacturing operations.
  • FIG. 1 is a view of a constructional form of heating element
  • the heating element which as a whole is given the reference numeral 1, comprises a frame 2 which is used as a support for a heating conductor 3.
  • This heating conductor 3 is shown in crosssection in FIG. 2. It comprises a core 4 which has a low coefficient of thermal expansion, and a heating conductor wire 5 wound helically on the said core.
  • the core in the illustrtaed constructional example, is formed of three strands 6 composed for example of mineral fiber material, which are twisted together. Owing to the low thermal expansion of the core, substantially the only modification in the heating conductor when heated is that the heating conductor wire 5 slightly increases in its diameter.
  • the heating conductor 3 is wound on the two lateral frame members used as conductor support strips 7-, as FIG. 1 shows.
  • These parallel frame members consist of an insulating material, for example being made of mica strips or the like. Instead of course it would be possible to use an insulating rod system or the like such as Ms tratedin FIG. 7. If mica strips are used, these can coma constructional form of prise notches or projections at their external sides to holds the individual loops of the winding in position.
  • FIG. 3. shows a diagrammatic section through a bread toaster with two toasting compartments.
  • the food to be toasted 12 for example slices of bread, are situated on supporting surfaces 13 which at the same time,.in known manner, eject the food when toasted.
  • a total of three heating elements are required, of which the two external heating elements 14 radiate only inwards, whereas the centralheating element ISradiates in both directions.
  • the heating elements 14, for example, can be wound only at one side with the heating conductor, whereas the central heating element 15 is wound, for example, all round.
  • the external heating elements l4'can have reflectors or heat insulating means 16 associated with them. These reflectors are not particularly'intended to reflect all the radiated heat arriving at them, but are rather intended to shield the housing from some of the heat.
  • FIGS. 4 to 6 show the electrical connection possibilities for a bread toaster with two toasting compartments.
  • FIG. 4 shows the ideal state where each heating element is designed for a voltage of 220'volts. There is no difference in the construction of the lateral heating elements 17 and the central heating element 18. The heating elements are connected in parallel to the mains voltage.
  • an open framework means for supporting a plurality of loops of said electric heating conductor said framework means consisting of two spaced insulating support means for supporting said plurality of loops, each of said two insulating support means having a first longitudinal dimension much greater than the width, and two spaced rigid connecting means for holding said two insulating support means in stationary spaced relationship, said two connecting means each having a second longitudinal dimension much greater than the width thereof, and each of said two insulating support means being fixed at respective opposite ends of each of said two spaced connecting means such that said two insulating support means are fixed apart from one another by a distance equal to said second longitudinal dimension of said two connecting means to form an open rectangular area without any structure therebetween, said electric heating conductor being only in contact with said two spaced insulating means of said open framework means and extending across said open framework means between said two spaced insulating means to radiate heat in both directions outwardly from the plane of the open area of said open framework means,
  • said two spaced connecting means include means for securing the heating element to a housing of a toaster.
  • each of said two insulating support means includes at least one notch and projection at an edge thereof to hold individual ones of said plurality of loops.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
US339915A 1972-03-11 1973-03-09 Electrical heating element for bread toaster or the like Expired - Lifetime US3870863A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2211911A DE2211911B2 (de) 1972-03-11 1972-03-11 Heizkörper für Brotröster

Publications (1)

Publication Number Publication Date
US3870863A true US3870863A (en) 1975-03-11

Family

ID=5838673

Family Applications (1)

Application Number Title Priority Date Filing Date
US339915A Expired - Lifetime US3870863A (en) 1972-03-11 1973-03-09 Electrical heating element for bread toaster or the like

Country Status (6)

Country Link
US (1) US3870863A (xx)
DE (1) DE2211911B2 (xx)
ES (1) ES412526A1 (xx)
FR (1) FR2175783B1 (xx)
GB (1) GB1421592A (xx)
IT (1) IT977522B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213033A (en) * 1977-06-13 1980-07-15 Bosch-Siemens Hausgerate Gmbh Electric toaster
US6297477B1 (en) * 1998-06-08 2001-10-02 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
US6417492B1 (en) * 1998-12-02 2002-07-09 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
US20040262299A1 (en) * 2003-06-30 2004-12-30 Daewoo Electronics Corporation Microwave oven with a toaster and method for controlling a heater of the toaster
US20070241166A1 (en) * 2006-04-14 2007-10-18 Steven Yue Carbon fiber heating plate device
US20120068809A1 (en) * 2010-09-20 2012-03-22 Keith Allen Spalding Fractional amp fuse and bridge element assembly therefor
WO2015138845A1 (en) * 2014-03-14 2015-09-17 Spectrum Brands, Inc. Rapid-toasting toaster
CN109480447A (zh) * 2019-01-04 2019-03-19 深圳市奋达科技股份有限公司 一种风筒发热架及风筒发热架的装配方法
CN110353527A (zh) * 2019-06-26 2019-10-22 黄润添 一种多士炉单面加热云母板发热丝绕线方式

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2658284C2 (de) * 1976-12-22 1985-04-25 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Elektrischer Brotröster
DE3100169A1 (de) * 1981-01-07 1982-08-05 Braun Ag, 6000 Frankfurt Fuer einen haartrockner geeignetes elektrisches drahtheizelement
FR2851405B1 (fr) 2003-02-19 2005-05-13 Seb Sa Element chauffant et grille-pain electrique a isolation thermique

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416481A (en) * 1920-02-18 1922-05-16 Longoria Antonio Electric heating pad
US1519176A (en) * 1923-01-22 1924-12-16 Thomas Edison Jackson Toaster
US1733023A (en) * 1928-03-31 1929-10-22 Kremenezky Johann Adjustable high ohmic resistance and method of manufacturing same
US2251697A (en) * 1938-06-29 1941-08-05 North American Electric Applia Heating pad and a process for making same
US2451839A (en) * 1944-02-15 1948-10-19 Tenaplas Ltd Electrical conductor
US2462607A (en) * 1945-03-01 1949-02-22 Donald W Browne Heating element
US2493542A (en) * 1947-07-29 1950-01-03 Mcgraw Electric Co Electric heating unit
US2581212A (en) * 1949-05-04 1952-01-01 Gen Electric Electrically heated fabric
US2706767A (en) * 1953-05-26 1955-04-19 Packchanian Ardzroony Arthur Heating attachment for toilet seats
US2747072A (en) * 1953-09-11 1956-05-22 Proctor Electric Co Toaster heating unit
US2847931A (en) * 1953-09-11 1958-08-19 Proctor Electric Co Bread toasters
US3002075A (en) * 1958-08-04 1961-09-26 Knapp Monarch Co Heating element for toaster
US3173123A (en) * 1962-09-26 1965-03-09 Achner Martin Electric heating apparatus
US3205341A (en) * 1962-03-05 1965-09-07 Electrothermal Eng Ltd Flexible electric heating device
US3461274A (en) * 1965-10-22 1969-08-12 Sunbeam Corp Electric food toaster

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1712010A (en) * 1923-10-29 1929-05-07 Howard E Somes Unit electrical heater
FR867427A (fr) * 1940-10-08 1941-10-27 élément chauffant pour radiateurs électriques
DE2043318A1 (de) * 1970-09-01 1972-03-16 Eichenauer Fa Fritz Heizkörper für Brotröster

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416481A (en) * 1920-02-18 1922-05-16 Longoria Antonio Electric heating pad
US1519176A (en) * 1923-01-22 1924-12-16 Thomas Edison Jackson Toaster
US1733023A (en) * 1928-03-31 1929-10-22 Kremenezky Johann Adjustable high ohmic resistance and method of manufacturing same
US2251697A (en) * 1938-06-29 1941-08-05 North American Electric Applia Heating pad and a process for making same
US2451839A (en) * 1944-02-15 1948-10-19 Tenaplas Ltd Electrical conductor
US2462607A (en) * 1945-03-01 1949-02-22 Donald W Browne Heating element
US2493542A (en) * 1947-07-29 1950-01-03 Mcgraw Electric Co Electric heating unit
US2581212A (en) * 1949-05-04 1952-01-01 Gen Electric Electrically heated fabric
US2706767A (en) * 1953-05-26 1955-04-19 Packchanian Ardzroony Arthur Heating attachment for toilet seats
US2747072A (en) * 1953-09-11 1956-05-22 Proctor Electric Co Toaster heating unit
US2847931A (en) * 1953-09-11 1958-08-19 Proctor Electric Co Bread toasters
US3002075A (en) * 1958-08-04 1961-09-26 Knapp Monarch Co Heating element for toaster
US3205341A (en) * 1962-03-05 1965-09-07 Electrothermal Eng Ltd Flexible electric heating device
US3173123A (en) * 1962-09-26 1965-03-09 Achner Martin Electric heating apparatus
US3461274A (en) * 1965-10-22 1969-08-12 Sunbeam Corp Electric food toaster

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213033A (en) * 1977-06-13 1980-07-15 Bosch-Siemens Hausgerate Gmbh Electric toaster
US6297477B1 (en) * 1998-06-08 2001-10-02 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
US6417492B1 (en) * 1998-12-02 2002-07-09 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
US20080041846A1 (en) * 2003-06-30 2008-02-21 Daewoo Electronics Corporation Microwave oven with a toaster and method for controlling a heater of the toaster
EP1493366A3 (en) * 2003-06-30 2005-06-15 Daewoo Electronics Corporation Microwave oven with a toaster and a method for controlling a heater of the toaster
US7041948B2 (en) 2003-06-30 2006-05-09 Daewoo Electronics Corporation Microwave oven with a toaster and method for controlling a heater of the toaster
US20060151482A1 (en) * 2003-06-30 2006-07-13 Daewoo Electronics Corporation Microwave oven with a toaster and method for controlling a heater of the toaster
US20040262299A1 (en) * 2003-06-30 2004-12-30 Daewoo Electronics Corporation Microwave oven with a toaster and method for controlling a heater of the toaster
US20070241166A1 (en) * 2006-04-14 2007-10-18 Steven Yue Carbon fiber heating plate device
US8629750B2 (en) * 2010-09-20 2014-01-14 Cooper Technologies Company Fractional amp fuse and bridge element assembly therefor
US20120068809A1 (en) * 2010-09-20 2012-03-22 Keith Allen Spalding Fractional amp fuse and bridge element assembly therefor
WO2015138845A1 (en) * 2014-03-14 2015-09-17 Spectrum Brands, Inc. Rapid-toasting toaster
CN106231965A (zh) * 2014-03-14 2016-12-14 品谱公司 快速烘烤多士炉
CN106231965B (zh) * 2014-03-14 2020-05-08 品谱公司 快速烘烤多士炉
CN109480447A (zh) * 2019-01-04 2019-03-19 深圳市奋达科技股份有限公司 一种风筒发热架及风筒发热架的装配方法
CN109480447B (zh) * 2019-01-04 2024-04-02 深圳市奋达科技股份有限公司 一种风筒发热架及风筒发热架的装配方法
CN110353527A (zh) * 2019-06-26 2019-10-22 黄润添 一种多士炉单面加热云母板发热丝绕线方式
CN110353527B (zh) * 2019-06-26 2022-09-09 广东科荣电器有限公司 一种多士炉单面加热云母板发热丝绕线方式

Also Published As

Publication number Publication date
IT977522B (it) 1974-09-20
ES412526A1 (es) 1976-05-16
DE2211911B2 (de) 1979-02-01
DE2211911A1 (de) 1973-09-27
FR2175783B1 (xx) 1977-12-30
FR2175783A1 (xx) 1973-10-26
GB1421592A (en) 1976-01-21

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