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Publication numberUS473713 A
Publication typeGrant
Publication dateApr 26, 1892
Filing dateJul 25, 1891
Publication numberUS 473713 A, US 473713A, US-A-473713, US473713 A, US473713A
InventorsHenry A. Rueter
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Covered electric wire
US 473713 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



N0. 473,713; Patented Apr. 26, 1892.

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SPECIFICATION forming part of Letters Patent NO. 473,713, dated April 26, 1892.

Application filed July 25, 1891. Serial No. 400,750. (No model) To 0. whom it may concern:

Be it known that I, HENRY A. RUETER, a citizen of the United States of America, residing at Boston, in the county of Suffolk and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Covering Wires, of which the following is a specification.

My invention is designed principally for the covering of wires which are to be used as elec trical conductors, although wires with myimproved covering are also useful and available for other purposes.

The invention includes an improved process of covering wires and an improved product. The product consists of a wire combined with a covering of parchmentized fiber having a spiral structure, and the improved method consists in Winding the fiber in strings or strips in a parchmentized and soft condition upon a moving wire.

In the practical working of my invention 1 may use apparatus substantially of the kind heretofore used for winding thread or cord upon cylindrical bodies, such as wires,whips, and the like.

An apparatus which may be used for the purpose is illustrated in the accompanying drawings, in which Figure 1 shows a vertical section of the machine. Fig. 2 is a sectional view showing a wire with the covering.

l-Ieretofore wires have been provided with an insulating-covering consisting of fibrous material wound spirally upon the wire and covered or saturated with some non-conducting material. Such coverings are practically double, and consist of a fibrous and a paraffine or gummy coating, which gives the proper continuity and density to the fiber.

My covering for the wire consists of a homogeneous solid integument as distinguished from a covering formed of layers or of saturated and cemented material, said integument being formed out of solid parchmentized fiber inclosing the wire. The form of vegetable fiber which I prefer to use in the manufacture of my improved covering is that of loose slightly-twisted cotton thread. This is subjected to the action of some parchmentizing material, such as sulphuric acid or chloride of zinc, (preferably the latter,) and while the fiber is in a soft and what is called gelatinous condition (the term having reference solely to its form or condition,) it is wound upon the wire either with or without the application of heat, and hardens thereon and becomes a homogeneous, solid, and closely-adhering covering, which is in a high degree nonconducting of electricity, and also to a high degree uninfiammable, while it is capable of being bent without fracture.

The most practical method of placing the fiber upon the wire is by winding it in a spiral direction about the wire. Then the material consolidates and hardens, while it becomes practically homogeneous, it still retains something of the spiral structure and is thereby rendered more flexible.

In the apparatus shown in the drawings convenient means are provided for applying the parchmentized fiber to the wire continuously as it is moved along.

In the drawings, A represents a hopper or funnel having a hole at the bottom for the passage of the wire B. Above the wire is a wheel C, carrying spools D, from which the threads'd run down through openings in the wheel to the wire 13, with which they are 0011- nected and upon which they are wound as the wheel C revolves. The wheel C is supported in a suitable frame, as E, which is of circular form and provided with rollers, upon which the wheel revolves. This frame E is supported in any suitable manner, and may be turned by a gear-wheel F, meshing with teeth on the periphery of the wheel C.

It will be understood that the wire is fed downward continuously and evenly. So far as the wheel carrying the spools and the mechanism for supporting and moving the wire are concerned, by means of which the threads are wound upon the wire, there is nothing new in the apparatus shown. The hopper or funnel and the pump are the only new features. In this hopper or funnel I pour a dilution of sulphuric acid or chloride of zinc or some equivalent chemical capable of partially dissolving or parchmentizing the fiber, so that the fiber is wet and softened as it is wound upon the fiber or directly thereafter. The hole in the bottom of the hopper A must be large enough to allow the free passage of the wire with its covering and necessarily permits the passage of the parchmentized liquid. This falls into a receptacle G, placed directly underneath the opening, and is returned to the hopper by means of the pump H, forcing the liquid up through the pipe h. Instead of the thread-cotton fiber I may use paper thread or paper strips, or any form of fiber in the proper stringy condition. The Wire after being covered is preferably drawn through a die or rollers to give it afinish, and the remaining acid may be removed by a bath of water or lime and water.

I claim as my invention 1. The hereinbefore-described method of

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2644029 *Jul 27, 1949Jun 30, 1953Connollys Blackley LtdNatural silk insulated electric conductor
US5217533 *Jul 8, 1991Jun 8, 1993The United States Of America As Represented By The Secretary Of The Air ForceCoating apparatus for continuous fibers
Cooperative ClassificationH01B7/02, Y10S118/19