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Publication numberUS2432868 A
Publication typeGrant
Publication dateDec 16, 1947
Filing dateApr 4, 1944
Priority dateApr 4, 1944
Publication numberUS 2432868 A, US 2432868A, US-A-2432868, US2432868 A, US2432868A
InventorsEarl John A, Knittle Gale L
Original AssigneeWestern Electric Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of removing insulation
US 2432868 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Dec. 16, 1947. J. A. EARL Er AL.

METHOD oF REMovING INSULATION Filed April 4, 1944 WEA/Toes J A. Ene/ GTI.. KW7-r1.5 5V ,d-M7 l, @NORA/EY Patented Dec. 16, 1947 UNITED lSTATES PATENT v(')FFICE METHOD F REMOVING INSULATION Application April 4, 1944, Serial No. 529,554

3 Claims.

This invention relates to a method of removing insulation.

In the manufacture of electrical apparatus, it quite frequently becomes desirable to remove insulation from the ends of metallic conductors, thus to facilitate their attachment to various portions of the electrical apparatus. Heretofore, numerous methods have been proposed, such as mechanically stripping the insulation from the end of the wire, or burning it therefrom. When insulation such as enamel is the material to be removed and where a plurality of strands of wire are to have insulation removed from them, the complete removal of the insulation mechanically requires a great deal of skill and care and takes an appreciable length of time to prevent damage to the conductors. In the method where an open flame was used to burn the insulation from the' burned from the conductor and, since the cavity,

is substantially enclosed, the oxygen in the cavity Will be burned and there will be little chance of oxidation of the conductor while it is in the cavity. Immediately upon removal of the conductor from the cavity and before the conductor has sufficient time to oxidize to an appreciable extent, it is quenched in a conveniently located bath of trichlorethylene, which will cool the conductor to the point where its oxidation will be apprecably slowed down and which will thus prevent undue oxidation of the conductor.

A complete understanding of the invention may be had'by reference to the following detailed description when considered in conjunction with the accompanying drawing, wherein the single gure discloses an apparatus constructed in accordance with thev invention and which may be used in the practicing of the method of the present invention.

In the drawing, the apparatus is shown mounted upon a base I, which serves to support a suitable container 2 containing a, supply of trichlorethylene and a standard 3. suitably mounted adjacent the upper end of the standard 3 is a lava tube 4 having suitably fixed to its inner surface a sheet of mica 5, which may be applied in any suitable manner to the inner surface of the tube 4. One end of the tubular structure thus formed is closed by a plug 6 formed of .Alundum cement. A tubular metal element l, having one end closed, as shown at 8 and in engagement with the plug 6, is positioned in the center of the lava tube 4. The tubular element I has a layer of electrical insulation 9, which may be mica, applied to it and around the cylinder thus formed by the tubular element 'I` and its outside layer of insulation a resistance wire Ill is wound, most of the resistance being provided at the open end of the element 'I to supply more heat to the open end of the chamben than is necessary at the closed end thereof. A huantity of asbestos packing II is placed between the sheet of mica 5 and the windings of resistance wire Ill to supplyheat insulation whereby the heat generated by the resistance wire I9 will be retained in the apparatus and will thus reduce the amount of current necessary to heat the tubular element 1. The resistance wire I0 may be connected by suitable leads (not shown) to a rheostat I2, which is, in turn, connected to any suitable current supply.

In practicing the method of .the present in vention, the temperature in the closed end of the tube is raised to approximately 1500 F. to burn substantially all of the oxygen on the inside of the tube when an insulated conductor is inserted therein and since the tube is open at one end, it comprises, in eiiect, a small non-oxidizing furnace, the interior of which may be heated to a temperature sufcient to burn the insulation I3 from a conductor I4 when the conductor is inserted in the tube and held there for a short time. The surfaces of the conductor I4 will, in the course of burning the insulation I3 therefrom, be heated to incandescence. However, there will be practically no oxidation of the surface of the conductor so long as it is held in the tubular element 1. As soon as the insulation I3 on that portion of the conductor extending into the tubular element 'I has been burned therefrom, the conductor may be withdrawn from the tubular element I and quickly plunged into the trichlorethylene in the container 2. In this manner, the conductor will be quenched without exposing it to the atmosphere for a sufficiently long time to permit an excessive amount of oxidation of its surface and, hence,'the conductor may readily be connected to other conducting parts of an electrical apparatus and will form a good conductive connection therewith.

What is claimed is:

1. A method of removing heat destructible insulation from a conductor which comprises producing ameless heat in a confined but accessible space of suiiiciently high temperature to destroy said insulation when said insulation is in said space, and inserting the end of an insulated conductor into said space to `effect the deoxidation of the space and the destruction of the insulation by the reaction of the insulation with the oxygen in said space thereby to remove the insulation.

2. A method of removing heat destructible insulation from a conductor which comprises producing flamesless heat in a confined but accessible space of sufficiently high temperature to destroy said insulation when said insulation is in said space, inserting the end of an insulated conductor into said space to effect the deoxidation of the space and the destruction of the insulation by the reaction of the insulation with the oxygen in said space thereby to remove the insulation, and transferring said end of the conductor directly from said space into a non-oxidizing quench.

3. A method of removing heat destructible insulation from a conductor which comprises pro- REFERENCES CITED The following references iile of this patent:

UNITED STATES PATENTS are of record in the 20 Number Name Date 1,882,947 Rotherham Oct. 18, 1932 2,116,228 Akin May 3, 1938 496,208 Procunier Apr. 25, 1893 1,035,596 Johnson Aug. 13, 1912 25 1,481,065 Opperman Jan. 15, 1924 2,116,228 Akin, Jr. May 3, 1938 1,595,793

Levinger Aug. 10, 1926

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US1882947 *May 8, 1930Oct 18, 1932Du PontWire stripping machine
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2526650 *May 22, 1947Oct 24, 1950Gaibel HymanThermoplastic severing and fusing machine
US2595411 *Jul 24, 1946May 6, 1952Maurice Ripoche Christian AndrMethod of removing oxides, oils, and grease from an uncoated metal article
US2620286 *Sep 3, 1948Dec 2, 1952Shaw Morris RRemoving carbonaceous deposits from still tubes
US2671913 *May 6, 1948Mar 16, 1954Hoover CoMachine for removing insulation from the ends of wound armature wires
US2709666 *Apr 19, 1951May 31, 1955Hartford Nat Bank & Trust CoMethod of locally removing the insulation layer of enamelled wire
US2711775 *Jun 27, 1951Jun 28, 1955Raybestos Manhattan IncMethod and apparatus for debonding of brake linings
US2731372 *Jun 6, 1952Jan 17, 1956Hoover CoMethod of removing the insulation from the ends of assembled commutator wires
US2737945 *Nov 20, 1952Mar 13, 1956Frank J NussPaint brush cleaning device
US2751317 *Jun 3, 1950Jun 19, 1956Orme John AMethod of removing insulating coatings from wires
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US3175429 *Jul 20, 1961Mar 30, 1965Tool Tech CorpWire stripper
US3250643 *Sep 30, 1965May 10, 1966Gen ElectricMethod for decoating utilizing a heated fluidized bed
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US3748176 *Sep 3, 1971Jul 24, 1973Honeywell Inf SystemsThermo-reclaiming process of aluminum substrates for disks
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US4769903 *Aug 29, 1986Sep 13, 1988Automated Systems & Devices, Inc.Cord filler remover and method
US4821410 *Aug 7, 1987Apr 18, 1989Pierpoint James WElectrical cord filler removal apparatus and method
US4860441 *Oct 7, 1988Aug 29, 1989Automated Technology Systems, Inc.Electrical cord filler removal apparatus and method
US6196297 *May 21, 1999Mar 6, 2001Thermon Manufacturing CompanyPipe stand instrument heater and mounting system
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DE1064580B *Sep 4, 1958Sep 3, 1959Licentia GmbhVerfahren und Vorrichtung zum Abisolieren von duennen Draehten
U.S. Classification134/19, 219/521, 81/9.51, 134/30, 174/110.00R, 134/38, 219/221
International ClassificationH02G1/12
Cooperative ClassificationH02G1/1275
European ClassificationH02G1/12D