US1302013A - Insulating material for electrical conductors. - Google Patents

Description

W. E. COOK. INSULATING MATERIAL FOR ELECTRICAL cowoucrons. APPLlCATlON FILED APR. 24. 1911.

j; ATTORNEYS.

TUNE @ATS PATENT OFFICE,

WILLIAM. E. COOK, OF NEW YORK, N. Y., ASSIGNOR TO INSULATION DEVELOPMENT CORPORATION, A CORPORATION OF NEW YORK.

INSULATING MATERIAL FOR ELECTRICAL CONDUCTORS.

Specification of Letters Patent.

Patented Apr 29, 1919..

Application filed' April 24, 1917. Serial No. 164,308.

To all whom it may concern Be it known that I, IVILLIAM E. Coon, a subject of the King of the United Kingdom of Great Britain and Ireland. residing at St. George, in the borough of Richmond, city of New York, county of Richmond, and State of New York, have invented certain new and useful Improvements in Insulating Material for Electrical Conductors, of which the following is a specification, reference being had therein to the accompanying drawings. which form a part thereof.

My invention relates to insulating material for electrical conductors, and more particularly to a matted, fibrous covering material for wires adapted after application to a wire to be saturated or impregnated with an asphaltum or other composition for waterproofing the covering and increasing its insulating efi'ect.

Heretofore conductor wires have been coated with a sliver of cotton which after being compacted and confined by a suitable braid has been passed through a bath of asphalt-um composition, as above described. This covering or wrapping of cotton sliver, is applied to a wire by mechanical means, and I have found, in actual practice, that the capacity of the machine is very much reduced and uniformity of the quality of the insulation throughout is made impossible by reason of the impossibility of increasing the speed of the machine because of the loose matting of the fibers of the sliver, and the tendency of the sliver to break, with a resultant loss of efiiciency even at fairly low speeds, or to attenuate, with a resultant variable thickness of the insulation.

IVith these conditions in mind, I have produced an insulating material which will retain therein all of the advantageous properties of av cotton sliver, that is its capability of quick absorption of the asphaltum composition, its ready compactibility about the wire while passing through the covering machine; and the adaptability of the overlapping edges of the spirally Wound material to mat, when compressed, to preserve continuity of the covering, and which in addition thereto, will permit an increase of the speed of the covering machine Without likelihood of the attenuation of the sliver or of its breakage.

I secure these results by embedding in the sliver, as it leaves the carding machine, a continuous strand of thread, cord or other non-conductive material which has been previously coated with a suitable adhesive so as to be firmly bonded to the sliver in a manner to prevent such sliver being gathered upon said strand with a resultant unching or accumulation of the sliverat different points of the insulation uponthe \VlIQ.

As this insulating material is being applied to a wire, all stresses resulting in a feeding movement of. the material, will be applied directly to this inclosed strand, thus permitting an increase in these stresses by an increased speed in the operation of the machine, to a point limited only by the strength of this strand. IVith insulating material made in accordance with my invention, the capacity of the covering machine may be increased eight or ten fold as compared with its speed when the insulating material is composed of a cotton sliver without the inclosed strand, bonded thereto.

The invention consists primarily in insulating material for electrical conductors consisting of a fibrous matted, absorbent body, consisting of a strip or ribbon folded longitudinally upon, and about, a relatively smaller continuous strand of non-conductive material and a binder between said body and said strand whereby movement of one relative to the other, as the material is being applied to a conductor is prevented; and in such other novel characteristics as are hereinafter set forth and described and more particularly pointed out in the claims hereto appended.

Referring to the drawings,

Figure 1 is a view of a short section of insulating material made in accordance with my invention, with the strand indicated in dotted lines; and

Fig. 2 is a section on the line 22 of Fig. 1.

Like letters refer to like views.

In the accompanying drawings an indicates a sliver formed of cotton, the fibers of which lie longitudinally of the sliver and are loosely mat-ted. Embedded in this mass of sliver bv having the opposite edges of the sliver foldct. upon each other, and about same, is a continuous strand 6 preferably parts in both consisting of fairly heavy cotton thread or cord. This strand is fed within the sliver, as the sliver leaves the carding machine, and before coming into engagement with the sliver, it is coated with a suitable adhesive having no particular characteristics which specially adapt it for this use, so that this strand will be firmly bonded to the sliver preparatory to the application of the material to-a wire.

By using the strand 7), it is possible to make covering material for the wire of a cotton sliver ribbon of sufficient width and thickness to provide an insulation for the wire of the desired thickness, and to premit the rapid covering of the wire therewith. Furthermore, by having the fibers very loosely matted, compaction of this mass about the wire is facilitated.

As the material is applied to the wire, the strand Z) will control the feeding movement of the material, thus effectively preventing the attenuation, or the breakage, of this sliver a. The application of this strand will not interfere in any way with the desired compaction of the sliver upon the wire, or have any substantial effect in modifying the absorptive properties of the sliver after it has been applied to the wire. In fact, in addition to facilitating the application of the material to the wire, this strand serves as a binding means for retaining the sliver upon the wire even after it has been saturated, or impregnated with an asphaltum composition, and will aid in compacting the fibrous material upon the wire as it is wrapped about same in the covering machine.

I have found it essential to embed this strand in loosely matted fibers and to bond it thereto in the manner above described.

Insulating material of the character herein described, while being capable of use in producing the ordinary insulated wire, having a braided covering, is particularly adapted for use with insulated wire in which this braid is dispensed with.

Having described the invention, what I Copies of this patent may smaller continuous he obtained for five cents each, by addressing isoaois claim as new and desire to have protected by Letters Patent is 1. Insulating material for electrical conductors consisting of a strip or ribbon having a fibrous, matted, absorbent body folded longitudinally thereof upon, and about. a relatively smaller continuous strand of flexible, non-conductive material and a binder between said body and said strand whereby movementof one relative to the other, as the material is being applied to a conductor, is prevented.

2. Insulating material for electrical conductors consisting of a strip or ribbon formed of cotton sliver folded longitudinally thereof upon and about and bonded to a relatively smaller continuous strand of flexible, non-conductive material.

3. Insulating material for electrical conductors consisting of a strip or ribbon of cotton sliver folded longitudinally thereof upon and about and bonded to a relatively strand of flexible, non conductive material, the fibers of said sliver at ending longitudinally of the strip or rib- 4. Insulating material for electrical conductors consisting of a strip or ribbon of cotton sliver, the edges of which are folded upon each other, and about a relatively smaller thread or cord, and an adhesive binder between said sliver and said thread or cord.

5. Insulating mate-rial for electrical conductors consisting of a strip or ribbon of cotton sliver, the edges of which are folded upon each other and about. a relatively smaller thread or cord, and an adhesive binder between said sliver and said thread or cord, the fibers of said sliver extending longitudinally of said thread or cord.

In witness whereof, I hereunto aflix my signature, in the presence of two subscribing witnesses, this 9th day of April 1917.

IVILIJIAM E. COOK. \Vitnesses:

BERTHE MUELLER. CLARICE FRANCK.

the Commissioner ct Patents,

Washington, 10. G.

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