US3840723A - Electric heating unit for drying hood - Google Patents

Electric heating unit for drying hood Download PDF

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Publication number
US3840723A
US3840723A US00269740A US26974072A US3840723A US 3840723 A US3840723 A US 3840723A US 00269740 A US00269740 A US 00269740A US 26974072 A US26974072 A US 26974072A US 3840723 A US3840723 A US 3840723A
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US
United States
Prior art keywords
heating
plates
heating unit
fan
heating element
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Expired - Lifetime
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US00269740A
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English (en)
Inventor
H Ohnmacht
K Meywald
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EICHENAUER F
EICHENAUER F DT
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EICHENAUER F
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Publication date
Application filed by EICHENAUER F filed Critical EICHENAUER F
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Publication of US3840723A publication Critical patent/US3840723A/en
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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/38—Arrangement of the electric heating means

Definitions

  • a heating unit for use in a drying hood cOmprises a radial flow fan surrounded by at least one annular [52] US. Cl 219/368, 34/99, 165/125, electric heating elemwt-
  • the heating element 219/364, 219/370, 219/376, 219/542, 338/302 prises a metallic supporting wire core having glass fila- [51 I (jl 05b 3 00, 45 20 33 244 3 04 mentary insulating material wound thereabout and a [58] Field of Search 219/366-371, thin heating wire wound about the insulating material- 2 9 374 37 3 59 4 3 53 3 5 5 57 400
  • the heating element is secured by a plurality of hold- 379 3 2 542 54g 551; 1 5 24 2 ing straps between a pair of annular plates of electri- 3 3 /3 2 305 315 317420 323425 332; cally insulating material spaced a short
  • the straps and electrical compo- 5 References Cited nents associated with the fan motor and heating ele- UNITED STATES PATENTS ments may all be secured to one of said plates.
  • the invention relates to a heating unit of the kind having a radial-flow fan with an annular air outlet surrounded by an annular heating element. Heating units of this kind are provided in drying hoods, e.g. for hair drying.
  • the tendency nowadays in the heating appliance art is towards constructional forms of ever smaller size, so as to make the appliances handy to use and to enable them to be stored without requiring a great deal of space.
  • the appliance housings are also generally made of plastics material which, as is shown, can only withstand a limited temperature. For this reason, in such appliances the heating power is reduced to an increasing extent so as to avoid damage to the housing. But reducing the overall size and the heating power give rise to conflicting requirements in regard to the construction of the heating unit.
  • the heating element consists of a helically coiled heating wire which surrounds the annular air outlet in annular manner.
  • a plurality of wire coils are arranged above one another'and adjacent one another within an annular chamber. Since the heating wire coils expand when heated, they tend to sag.
  • the heating wire coils In order to prevent the wire coils from contacting one another, they have to be supported at several places within the annular chamber, which is effected for example with the use of ceramic supports which guide and support the heating wire coil in holes.
  • These supporting ceramic plates constitute insertswhich are an obstacle to flow, and have a disadvantageous effect on the fan which is upstream of them and on the efficiency of the drying hood.
  • the invention has as its object to construct a heating unit of the aforementioned kind in such a manner that it is possible to reduce the heating power to suit practical requirements whilst at the same time making it possible to reduce the overall size without efficiency losses.
  • the heating element comprises a supporting core which has a thin heating wire wound about it and surrounds the air outlet ring in annular manner, the wirewound core being arranged between two plates of insu' lating material with small spacing, and being secured by means of a few holding straps.
  • the heating element constitutes a structure which is stable in itself, so that the diameter of the wire can be reduced to a minimum without thereby giving rise to a risk of short-circuiting. For this reason the flow duct can also be given a low height since the spacing of the insulating material plates need only be slightly greater than the diameter of the heating element. Finally, it is only necessary to provide a few holding straps constituting obstacles to flow, and these can moreover be made desirably narrow since they only fix the wire heating element in position but do not need to support it.
  • two such heating elements are provided concentrically with respect to one another. This does not add to the height of the flow duct although it does involve a widening which does not detrimentally affect anything else.
  • the holding straps are preferably provided in the form of narrow spring clips such that the annular heating element can be inserted into the clips.
  • the invention also provides the possibility that the holding straps, all connecting contacts, a temperature switch, and a resistance section providing a tapping for a fractionalhorsepower motor of the fan, are fixed to one of the insulating material plates. This gives a constructional form which is particularly advantageous from the assembly point of view, since almost all of the parts can be attached with rivets or eyes to a single plate.
  • a constructional form which is space-saving and advantageous as regards its dimensions is, moreover, ob tained if a holding strap made of metal at the same time forms a connection for the motor tapping.
  • the necessary connecting leads for the heating unit and also the resistance section can consist of metal strips which can be arranged in a particularly simple manner on the plate of insulating material.
  • FIG. 1 is an axial section through the upper part of a drying hood
  • FIG. 2 is a plan view of. the underside of a carrier plate ofa heating unit shown in FIG. I;
  • FIG. 3 is a section taken on III/III of FIG. 2.
  • FIG. 4 is a cross-section of the heating wire of this invention.
  • the drying hood which is shown in FIG. I is designed for hair drying. It comprises a housing made of plastics material which as a whole is given the reference numeral l and in which there is arranged a fractionalhorsepower motor 2 with a radial fan 3 in front of it.
  • the radial fan draws air in through apertures 4 and delivers it as shown by arrows 5 into an annular heating duct 6.
  • a heating element Arranged in the heating duct 6 is a heating element which as a whole is given the reference numeral 7.
  • the air heated by this heating element is deflected by a curtain 9 into a substantially axial direction indicated by arrows 8 and passes through apertures in the hood part 10 into the interior of the hair-drying hood.
  • the heating element designated as 7 in FIG. I is arranged between upper and lower plates 11, 12 of insulating material, as illustrated in FIG. 3.
  • the said element comprises a supporting core 13 consisting e.g. of steel wire, about which an insulating material 13, e.g. glass filament material, is spun, whereas the actual heating wire 14 is wound on this insulation.
  • the heating element 7 is arranged annularly about the air outlet ring of the fan 3, as FIG. 2 in conjunction with FIG. 1 shows.
  • the heating element 7 is fixed by a total of three holding straps 15 which are connected by eyes or rivets to the upper insulating material plate 11.
  • the heating unit is a switchable two-stage unit, in which the annular heating element 7 isan inner element and is surrounded concentrically by an outer annular heating element 18. This latter heating element 18 is constructed and held in the same way as the former 7.
  • Connecting contacts 19, 20 and 21 are also secured as eyelets to the upper insulating material plate 11.
  • This plate also carries an over-temperature switch 22.
  • a connecting lead, in the form of a metal strip 23, is also attached by eyelet means to the insulating material plate 11.
  • a resistance section is also provided as a motor tapping.
  • This motor tapping is provided in the form of a metal strip 24, and a connection to it is effected at one end by means of one of the holding straps, e.g. the holding strap 25.
  • the other end of the metal strip 24 is connected to an eyelet 25', similar to 19, 20 and 21, for connection to a fractional-horsepower motor.
  • a heating unit havinga housing, a radial-flow fan mounted in said housing, said fan being of the type having an axial air intake and providing radial air flow in an annular outlet path surrounding said fan, a heating element assembly and means for supporting said heating element'assembly in said housing with respect to said fan, the improvement comprising said heating element assembly including:
  • At least one annular support core arranged concentrically about said fan' in the annular outlet path, thin-heating wire wound about said at least one support core,
  • a plurality of holding straps secured to at least one of said two plates for holding said support core between said two plates.
  • a heating unit according to claim 1 wherein at least a second annular support core having a thin heating wire wound thereabout is held by a' second plurality of holding strapsbetween said two plates, said at least second support core being concentric with said at least one support coreL 3.
  • said plurality of holding straps are in the form of narrow spring clips.
  • a heating unit further comprising connecting contacts for connecting said thin heating wire to a source of electrical energy, a temperature switch connected between one of said connecting contacts and said source of electrical energy, and a por- 4 tion of said heating wire forming a resistance section to provide a motor tapping for a fractional horsepower motor for said fan.
  • a heating unit according to claim 5, wherein said plurality of holding straps, said connecting contacts, and said temperature switch are all connected to the same one of said two plates.
  • one of said plurality of holding straps is made of metal and provides an electrical connection for a motor tapping to said heating wire.
  • said at least one support core consists of a steel wire having an insulating material wound about said steel wire.
  • a heating unit for use in a drying hood comprising a housing having an air inlet,
  • a radial-flow fan mounted in said housing with respect'to said air inlet to provide air flow through an annular air outlet duct concentrically surrounding said fan
  • At least one heating element assembly arranged in V said housing for concentrically surrounding said fan, such that said air flow through said annular air outlet duct flows over said heating element assembly, wherein said at least one heating element assembly comprises a supporting core, a thin heating wire wound about said core, and two annular plates of insulating material mounted in said housing, said plates being separated by a smalldistance and said core being disposed between the two plates by a plurality of holding straps secured to at least one of said two plates, whereby said at least one heating element assembly provides reduced heating power in a compact structure.
  • a heating unit further comprising connecting contacts for connecting said thin heating wire to a source of electrical energy, a temperature switch connected between one of said connecting contacts and said source of electrical energy, and a portion of said heating wire forming a resistance .section to provide a motor tapping for a fractionalhorsepower motor for said fan.
  • a heating unit wherein said plurality of holding straps, said connecting contacts; and said temperature switch are all connected to the same one of said two plates.

Landscapes

  • Resistance Heating (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Drying Of Solid Materials (AREA)
  • Cleaning And Drying Hair (AREA)
US00269740A 1971-09-04 1972-07-07 Electric heating unit for drying hood Expired - Lifetime US3840723A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2144361A DE2144361C3 (de) 1971-09-04 1971-09-04 Trockenhaube

Publications (1)

Publication Number Publication Date
US3840723A true US3840723A (en) 1974-10-08

Family

ID=5818661

Family Applications (1)

Application Number Title Priority Date Filing Date
US00269740A Expired - Lifetime US3840723A (en) 1971-09-04 1972-07-07 Electric heating unit for drying hood

Country Status (6)

Country Link
US (1) US3840723A (enrdf_load_stackoverflow)
JP (1) JPS5115899B2 (enrdf_load_stackoverflow)
DE (1) DE2144361C3 (enrdf_load_stackoverflow)
FR (1) FR2150704B1 (enrdf_load_stackoverflow)
GB (1) GB1396418A (enrdf_load_stackoverflow)
IT (1) IT962179B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999305A (en) * 1974-03-05 1976-12-28 U.S. Philips Corporation Hair-drying hood
US20080229480A1 (en) * 2007-03-21 2008-09-25 Rose Hardwick Heat deflector for use with a hood-type hair dryer

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2419051A1 (de) * 1974-04-20 1975-11-06 Eichenauer Fa Fritz Heizkoerper fuer trockenhauben
JPS5198784U (enrdf_load_stackoverflow) * 1975-01-31 1976-08-07
JPS5198785U (enrdf_load_stackoverflow) * 1975-01-31 1976-08-07
JPS55175Y2 (enrdf_load_stackoverflow) * 1975-02-03 1980-01-07
JPS55176Y2 (enrdf_load_stackoverflow) * 1975-02-03 1980-01-07
JPS5198774U (enrdf_load_stackoverflow) * 1975-02-03 1976-08-07
JPS55174Y2 (enrdf_load_stackoverflow) * 1975-02-03 1980-01-07
JPS5198779U (enrdf_load_stackoverflow) * 1975-02-03 1976-08-07
JPS5645525Y2 (enrdf_load_stackoverflow) * 1975-02-03 1981-10-24
JPS55166Y2 (enrdf_load_stackoverflow) * 1975-02-03 1980-01-07
JPS5645528Y2 (enrdf_load_stackoverflow) * 1975-02-05 1981-10-24
JPS51101287U (enrdf_load_stackoverflow) * 1975-02-07 1976-08-13
JPS55169Y2 (enrdf_load_stackoverflow) * 1975-02-07 1980-01-07
JPS51101286U (enrdf_load_stackoverflow) * 1975-02-07 1976-08-13
JPS55170Y2 (enrdf_load_stackoverflow) * 1975-02-07 1980-01-07
IL46779A (en) * 1975-03-09 1977-08-31 Glucksman D Electric air-heating element
JPS51126776U (enrdf_load_stackoverflow) * 1975-03-19 1976-10-14
JPS5645526Y2 (enrdf_load_stackoverflow) * 1975-03-19 1981-10-24
JPS55172Y2 (enrdf_load_stackoverflow) * 1975-03-19 1980-01-07
DE2645939C3 (de) * 1976-10-12 1985-08-01 Fa. Friedrich Würth, 7000 Stuttgart Elektrische Heizwendel mit Fangseele sowie Verfahren zu ihrer Herstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999305A (en) * 1974-03-05 1976-12-28 U.S. Philips Corporation Hair-drying hood
US20080229480A1 (en) * 2007-03-21 2008-09-25 Rose Hardwick Heat deflector for use with a hood-type hair dryer

Also Published As

Publication number Publication date
FR2150704A1 (enrdf_load_stackoverflow) 1973-04-13
DE2144361C3 (de) 1980-04-10
GB1396418A (en) 1975-06-04
JPS49116632A (enrdf_load_stackoverflow) 1974-11-07
DE2144361B2 (de) 1979-07-12
DE2144361A1 (de) 1973-03-08
FR2150704B1 (enrdf_load_stackoverflow) 1977-01-14
IT962179B (it) 1973-12-20
JPS5115899B2 (enrdf_load_stackoverflow) 1976-05-20

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