US1367341A - Electric heating unit - Google Patents

Electric heating unit Download PDF

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Publication number
US1367341A
US1367341A US262722A US26272218A US1367341A US 1367341 A US1367341 A US 1367341A US 262722 A US262722 A US 262722A US 26272218 A US26272218 A US 26272218A US 1367341 A US1367341 A US 1367341A
Authority
US
United States
Prior art keywords
sheath
resistance
tube
electric heating
helix
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 - Lifetime
Application number
US262722A
Other languages
English (en)
Inventor
Charles C Abbott
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.)
General Electric Co
Original Assignee
General Electric Co
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
Family has litigation
Priority to NL9276D priority Critical patent/NL9276C/xx
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22998739&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US1367341(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by General Electric Co filed Critical General Electric Co
Priority to US262722A priority patent/US1367341A/en
Priority to DEI20568D priority patent/DE383355C/de
Application granted granted Critical
Publication of US1367341A publication Critical patent/US1367341A/en
Priority to FR535632D priority patent/FR535632A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/16—Rigid-tube cables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing
    • Y10T29/49089—Filling with powdered insulation
    • Y10T29/49091—Filling with powdered insulation with direct compression of powdered insulation

Definitions

  • My invention relates to-elctric heating elements of the type in which a resistance conductor is inclosed' in a metallic sheath ducing such a resistance element is to locate a straight resistance conductor. which may be called the core wire. centrally of a metallic tube which is to form the sheath and fill the tube with an insulating powder. such as magnesia. so as to completely embed and properly center the core wire. The ends of the tube are then plugged, suitable provision being made for the ends of the core wire which extend beyond the tube. and the 'tube is subjected to a reducing process. The result of this operation is the reduction of both the sheath and the core wire, with the consequent compacting of the insulating material.
  • the arrangement is such that when the core wire is reduced to its desired size.
  • the insulating material is so thoroughly compacted that it becomes practically a unit with the core wire and may be drawn or rolled like a solid metal.
  • This element being supplied with the proper terminals, constitutcs an cilicient heating unit since it is exceedingly rugged and requires no insulat ing support, the core wire being well insulated and protected from mechanical injury.
  • Such a resistance element naturally has its limitations. since the space available for the heating element is not always suflicient to contain the length of conductor necessary to produ e the required resistance; This is particularly true where the element is to be used on a circuit of 220 v. or higher.
  • sheath wire having a helical or slllllOlls conductor instead of a straight core wire may be produced having all the advantages of the above described .straight conductor sheath wire in addition to advantages of its own.
  • the principal advantage of this form of unit liesin the fact that a much greater length of core wire may be contained 111 a given. space so that the unit is much more compact and self contained and is readily adapted to *the higher voltages. without occupying increased space.
  • advantages however, both from the standpoint of the manufacture and of the utility of the unit itself which are important.
  • One ofthese advantages arises from the fact that the core wire is not reduced in diameter by the reduction of the sheath.
  • the core wire Since the core wire is not drawn down, a of wire which is difficult to draw. but whlch may be more suitable, may be used. A greaterthickness' of insulating material which will give greater margin of safety to the electrical insulation may also be used since the core wire is not reduced, whereas in reducing straight core wire, it the thickness of the insulating material is above a certain maximum. the core wire ⁇ vill'not be drawn down properly. Furthermore the core wire retains its surface left by the drawing dies. and a smaller wire may be used than would be safe where it is drawn down in the tube. There are also certain other advantages. such as simplified terminal connections, greater latitude in thegrade and character of the metals used for the sheath.
  • a sinuous or helical resistance element is centrally located in a metallic sheath.
  • FIG. 1 is a sectional view of the resistance conductor mounted in a tube ready for filling
  • Fig. 2 is an end view of the same
  • Fig. 3 is aview of the filled tube partially broken away to show the terminals
  • F 1g. 4 is a view showin the unit re **d
  • Fig. 5 is a detail 0 the terminal-
  • I form a sinuous resistance element which is preferably in the form of a helix, the material being a high resistance material such as nickelchromium allo
  • This conductor is supported centrally of the tube 11 which may be of any desired metal capable of being drawn or swaged down.
  • the helix when wound may be a closed helix but, when it is supported in the tube, it is stretched so as to separate the turns and at the same. time the tension will tend to keep the helix in a central position.
  • the two ends of the helix are thus provided with terminal sup rts which are passed through holes in tin caps 15 and 16 which are fitted over the ends of the tube, the terminals being secured to the caps by set screws 17 and 18.
  • the wire is preferably under tension, as above inted out, and is supported so that the he ix will be kept in its proper central position.
  • the cap 15 is provided with a funnel 19 havin rforations 20 throu h which the insu ating material is pou into the tube.
  • the insulating material employed is one which has the quality of compacting into a solid mass and at the same time has high electrical insulatirig properties and high heat conductivity. agneslum oxid is a suitable material for this purpose.
  • the helix is not materially extended by drawing it out so asv to se pressing the helix. without-substantial movement of the helix with ref'eiehc'e to the surrounding insulation.
  • the insulating material is thus very thoroughly'compacted all around the helix. It is, therefore, ssible to determine very accurately just w at the resistance of the helix will be upon a given reduction, or to put it in another way, it is possible to determine just when a certain resistance is reached by measuring the length of the tube. When the tube is properly reduced, the sheath and insulating material are cut away so as to expose the terminal for some length, as shown in Fig. 4, and the unit is then ready for use.
  • Ain electric heating unit comprising a the-sheath to compact the insulating mate- 60 powdered heat refractory dense mass within saidsheathfand a helix resistance element embedded in said mass so as ,to readily conduct heat from the resistance element to the sheath.
  • An electric heating unit comprising a metallic sheath
  • An electric heating unit comprising a -metallic. sheath, powdered heat refractory -5. .An electric heating unit comprising a metallic sheath,
  • electric heating unit comprising a metallic sheatlf, Wdered heat refractory insulating" material compacted to a' hard dense mass within said sheath, a helical resistance element embedded in said mass so as to readily conduct heat from the resistance element to the sheath and terminal members secured to ,the ends of the element and pro- -jecting'from the sheath, said members havmg enlarged ends upon which the element is mo ted.
  • the method of forming a resistance unit' which. consists in mounting a sinuous resistance elementin a metallic sheath, fillingntihe space around the element with a heat re ctosy insulatingmaterial and reducing the-sheath sufficiently to thoroughly compact the insulating material around the resistance element.
  • an electric heating unit which consists in fitting terminal members intothe end of a helical resistance conductor and mounting the .same in a metallic sheath, filling the space around the element with a heat refractory insulating material and then compacting the material around the .element and terminal to fix them against displacement.
  • An electric heating unit comprising a metallic sheath, powdered heat refractory insulating, material compacted to a hard dense mass within said sheath, a helical resistance element embedded in said mass so as to. readily conduct heat from the resistance element to the sheath and terminal members inserted in the element and projecting from the sheath.

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  • Resistance Heating (AREA)
US262722A 1918-11-15 1918-11-15 Electric heating unit Expired - Lifetime US1367341A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL9276D NL9276C (fr) 1918-11-15
US262722A US1367341A (en) 1918-11-15 1918-11-15 Electric heating unit
DEI20568D DE383355C (de) 1918-11-15 1920-07-11 Verfahren zur Herstellung einer elektrischen Heizeinheit der Manteldrahttype
FR535632D FR535632A (fr) 1918-11-15 1921-05-18 Perfectionnements aux éléments électriques de chauffage et à leurs procédés de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US262722A US1367341A (en) 1918-11-15 1918-11-15 Electric heating unit

Publications (1)

Publication Number Publication Date
US1367341A true US1367341A (en) 1921-02-01

Family

ID=22998739

Family Applications (1)

Application Number Title Priority Date Filing Date
US262722A Expired - Lifetime US1367341A (en) 1918-11-15 1918-11-15 Electric heating unit

Country Status (4)

Country Link
US (1) US1367341A (fr)
DE (1) DE383355C (fr)
FR (1) FR535632A (fr)
NL (1) NL9276C (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456343A (en) * 1944-12-06 1948-12-14 Tuttle & Kift Inc Electric heater and method of making same
US2637755A (en) * 1950-02-16 1953-05-05 Harold N Ipsen Electric heating apparatus
US2809223A (en) * 1955-09-26 1957-10-08 Lindberg Eng Co Terminal for heating furnaces
US2816200A (en) * 1954-12-15 1957-12-10 Int Nickel Co Electrical heating unit
US2854556A (en) * 1954-07-26 1958-09-30 Wiegand Co Edwin L Sheathed electric heater and method of making the same
US2927299A (en) * 1954-05-20 1960-03-01 Fredrick L Lefebvre Heater tube mounting
US2995646A (en) * 1959-02-26 1961-08-08 Arthur W Kawalle Removable type electric heating element
US3263275A (en) * 1963-07-22 1966-08-02 Thiokol Chemical Corp Apparatus for casting small solid propellant rocket motors for testing purposes
DE1291427B (de) * 1963-09-09 1969-03-27 Proctor Silex Corp Elektrisches Buegeleisen
US5644835A (en) * 1996-08-20 1997-07-08 Mold-Masters Limited Heating element method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942884C (de) * 1944-04-21 1956-05-09 Siemens Ag Verfahren zur Herstellung einer elektrischen Heizeinheit der Manteldrahttype
DE949071C (de) * 1950-10-19 1956-09-13 British Insulated Callenders Isolierte elektrische Leiter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456343A (en) * 1944-12-06 1948-12-14 Tuttle & Kift Inc Electric heater and method of making same
US2637755A (en) * 1950-02-16 1953-05-05 Harold N Ipsen Electric heating apparatus
US2927299A (en) * 1954-05-20 1960-03-01 Fredrick L Lefebvre Heater tube mounting
US2854556A (en) * 1954-07-26 1958-09-30 Wiegand Co Edwin L Sheathed electric heater and method of making the same
US2816200A (en) * 1954-12-15 1957-12-10 Int Nickel Co Electrical heating unit
US2809223A (en) * 1955-09-26 1957-10-08 Lindberg Eng Co Terminal for heating furnaces
US2995646A (en) * 1959-02-26 1961-08-08 Arthur W Kawalle Removable type electric heating element
US3263275A (en) * 1963-07-22 1966-08-02 Thiokol Chemical Corp Apparatus for casting small solid propellant rocket motors for testing purposes
DE1291427B (de) * 1963-09-09 1969-03-27 Proctor Silex Corp Elektrisches Buegeleisen
US5644835A (en) * 1996-08-20 1997-07-08 Mold-Masters Limited Heating element method

Also Published As

Publication number Publication date
DE383355C (de) 1923-10-12
FR535632A (fr) 1922-04-19
NL9276C (fr)

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