US2199879A - Process for the manufacture of armored electric heating elements - Google Patents

Process for the manufacture of armored electric heating elements Download PDF

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Publication number
US2199879A
US2199879A US147151A US14715137A US2199879A US 2199879 A US2199879 A US 2199879A US 147151 A US147151 A US 147151A US 14715137 A US14715137 A US 14715137A US 2199879 A US2199879 A US 2199879A
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United States
Prior art keywords
core
insulating material
electric heating
manufacture
heating elements
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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
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US147151A
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English (en)
Inventor
Deroche Andre
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2199879A publication Critical patent/US2199879A/en
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
    • 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • the present invention relates to a process for the manufacture of armored electric heating elements comprising at least one helically wound conductor separated from an outside armoring by a layer of insulating material.
  • the subject of the present invention is a process obviating these drawbacks.
  • a metal core hardened by cold working is used, said metal having a low modulus of elasticity when annealed, so that it may be then considerably elongated by a rather small tension without breaking.
  • the said core is annealed after the compression of the insulating material and then elongated.
  • Figure 1 is a side view partly in section of an armored heating element with a core inserted therein;
  • Fig. 3 is a similar view after elongation of the' core.
  • a hard coldworked brass wire 2 is preferably used. It is introduced into the inside of a helically wound conductor wire I insulated from an outside armoring I by a layer of insulating material I.
  • This layer of material is for example a layer of mineral material such as alumina or magnesia.
  • This brass wire has an outside diameter equal to the inside diameter of the helix formed by the wound conductor wire.
  • the wire employed is very hard and can serve eflectlvcly for preventing any deformation of the Just prior to elongationhelically wound wire during the compression of the insulating material.
  • the reduction in cross section of the element which causes the compression of the insulating material is carried out for example, by ham- 5 mering.
  • the hardened cold-worked brass wire which serves as a core for the element during the compression of the insulating material has a length slightly greater than that of the element.
  • the element After compression, the element is raised to 'a temperature at least equal to the annealing temperature of'the brass employed.
  • the annealing temperature can be exceeded Without disadvantage.
  • the brass After annealing, the brass has a. low modulus ofelasticity and it is sufficient to pull on the two ends of the brass wire which project from the ends of the heating element, by means of pliers 5 for instance, in order to obtain a considerable elongation of the annealed brass wire. This 20 elongation is accompanied by a uniform reduction ofdiameter. over'the whole length of the brass wire. As a result of this the brass wire 2 may then readily be removed from the heating element which it has served to manufacture.
  • the space which it occupied may be filled with insulating material, forv example, by means of powdered alumina or magnesia.
  • the presence of this powder in the space occu- 30 pas by the core may have the effect of facilitating the bending of the heating element.
  • the process applies equally well to all the methods or manufacture of armored resistances, 4 for example those obtained by the conversion in situ of magnesium to its oxide, those where insulating material is introduced into the tube in the form of compressed pastilles (in this case the pastilles are reduced to powder by the reduction 45 in section), or those formed by a paste introduced into the tube.
  • a method for manufacturing an electric heating element comprising at least one helically wound conductor arranged inside a mass of insulating material enclosed in an outside armoring, said method consisting in introducing inside the helically 'wound conductor embedded in the insulating material a hard metal anvil-forming core 55 tively small tension without breaking after annealing at high temperature, transversally compressing the insulating material against the anvili'orming core, annealing the core, elongating the core alone, removing said core, and tilling the space occupied by it with insulating material.
  • a method ior manuiacturing an electric heating element comprising at least one helically wound conductor arranged inside a mass of insulating material enclosed in an outside armoring. said method consisting in introducing inside the helically wound conductor embedded in the insulating material a hard metal anvil-forming core capable of being considerably elongated by a relatively small tension without breaking after annealing at high temperature. hammering the insulating material against the anvil-forming core, annealing the core. elongating the core alone. removing said core, and iilling the space occupied by it with insulating material.
  • a method for manuiacturing an electric heating element comprising at least onahelieally capable oi being considerably elongated by a relawound conductor arranged inside a mass 0! insulating material enclosed in an outside armoring. said method consisting in introducing inside the heiically wound conductor embedded in the insulating material a brass anvil-forming core hardened by cold working, transversally compressing the insulating material against the anyiliorming core, annealing the core. elongating the core alone, removing said core. and filling the space occupied by it with insulating material.
  • a method for manufacturing an electric heating element comprising at least one helically wound conductor arranged inside a mass of insulating material enclosed in an outside armoring. said method consisting in introducing inside the helically wound conductor embedded in the insulating material. an anvil-forming core of a metal 01' high melting point. transversely compressing the insulating material against the anviliorming core. elongating the core alone. removing saidcore, andiillingthespaceoccupiedbyitwith insulating material.

Landscapes

  • Resistance Heating (AREA)
  • Finger-Pressure Massage (AREA)
  • Insulated Conductors (AREA)
  • Catching Or Destruction (AREA)
US147151A 1936-06-12 1937-06-08 Process for the manufacture of armored electric heating elements Expired - Lifetime US2199879A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE416030T 1936-06-12

Publications (1)

Publication Number Publication Date
US2199879A true US2199879A (en) 1940-05-07

Family

ID=3870378

Family Applications (1)

Application Number Title Priority Date Filing Date
US147151A Expired - Lifetime US2199879A (en) 1936-06-12 1937-06-08 Process for the manufacture of armored electric heating elements

Country Status (7)

Country Link
US (1) US2199879A (fr)
BE (1) BE416030A (fr)
CH (1) CH207185A (fr)
DE (1) DE666662C (fr)
FR (1) FR822667A (fr)
GB (2) GB481243A (fr)
NL (1) NL44964C (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485496A (en) * 1944-06-19 1949-10-18 Stewart Warner Corp Electrical igniter
US2538873A (en) * 1942-11-14 1951-01-23 Hartford Nat Bank & Trust Co Electric discharge tube
US2542656A (en) * 1941-01-31 1951-02-20 Hartford Nat Bank & Trust Co Indirectly heated cathode
US2880298A (en) * 1958-06-02 1959-03-31 Gen Electric Electric heating units
US2880297A (en) * 1955-06-22 1959-03-31 Gen Electric Electric heating units
US2928170A (en) * 1953-04-16 1960-03-15 James A Mclaughlin Method for making form ties
US3007236A (en) * 1956-02-27 1961-11-07 Gen Electric Methods of making electric heating units
US3100331A (en) * 1960-02-01 1963-08-13 Specialties Dev Corp Method of making articles composed of resistance material
US3153696A (en) * 1956-03-12 1964-10-20 Schlumberger Well Surv Corp Methods for processing cables
US3182384A (en) * 1960-12-27 1965-05-11 Industrial Res Prod Inc Method of making self-supporting coils and mandrel therefor
US3193906A (en) * 1960-03-04 1965-07-13 Donald J Belknap Method of making microminiature incandescent lamps
US3206704A (en) * 1961-02-21 1965-09-14 Dale Electronics Electrical resistor
US3238489A (en) * 1962-06-11 1966-03-01 Dale Electronics Electrical resistor
US3813771A (en) * 1973-07-02 1974-06-04 Gen Electric Method of producing electrical resistance heaters, and the improved heater products
US3839786A (en) * 1972-12-04 1974-10-08 Chase Shawmut Co Process for manufacturing high-voltage fuse

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542656A (en) * 1941-01-31 1951-02-20 Hartford Nat Bank & Trust Co Indirectly heated cathode
US2538873A (en) * 1942-11-14 1951-01-23 Hartford Nat Bank & Trust Co Electric discharge tube
US2485496A (en) * 1944-06-19 1949-10-18 Stewart Warner Corp Electrical igniter
US2928170A (en) * 1953-04-16 1960-03-15 James A Mclaughlin Method for making form ties
US2880297A (en) * 1955-06-22 1959-03-31 Gen Electric Electric heating units
US3007236A (en) * 1956-02-27 1961-11-07 Gen Electric Methods of making electric heating units
US3153696A (en) * 1956-03-12 1964-10-20 Schlumberger Well Surv Corp Methods for processing cables
US2880298A (en) * 1958-06-02 1959-03-31 Gen Electric Electric heating units
US3100331A (en) * 1960-02-01 1963-08-13 Specialties Dev Corp Method of making articles composed of resistance material
US3193906A (en) * 1960-03-04 1965-07-13 Donald J Belknap Method of making microminiature incandescent lamps
US3182384A (en) * 1960-12-27 1965-05-11 Industrial Res Prod Inc Method of making self-supporting coils and mandrel therefor
US3206704A (en) * 1961-02-21 1965-09-14 Dale Electronics Electrical resistor
US3238489A (en) * 1962-06-11 1966-03-01 Dale Electronics Electrical resistor
US3839786A (en) * 1972-12-04 1974-10-08 Chase Shawmut Co Process for manufacturing high-voltage fuse
US3813771A (en) * 1973-07-02 1974-06-04 Gen Electric Method of producing electrical resistance heaters, and the improved heater products

Also Published As

Publication number Publication date
NL44964C (fr) 1939-01-16
FR822667A (fr) 1938-01-05
GB487662A (en) 1938-06-23
GB481243A (en) 1938-03-08
BE416030A (fr) 1936-07-31
CH207185A (fr) 1939-10-15
DE666662C (de) 1938-10-25

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