US1214830A - Moisture-proof switchboard-cord. - Google Patents

Description

W. L. RUNZEL.

MOISTURE PROOF SWITCHBOARD CORD.

APPLICATION FILED MAY 24. 1915.

1,214,830. Patented Feb. 6,1917.

w: New: PETERS CO1.PHOTO-LIYNOHWASHYNGTUN. 11c.

UNITED STATES PATENT OFFICE".

WILLIAM L. RUNZEL, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO RUNZEL-LENZ ELECTRIC MIEG. 00., OF CHICAGO, ILLINOIS.

MOISTURE-PROOF SWITCHBOARD-CORD.

To all whom it may concern:

Be it known that I, WILLIAM L. RUNZEL, a citizen of the United States, residing at Chicago, "in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Moisture-Proof Switchboard-Cords, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification. I

My invention relates to flexible switch board cords and has for its object the provision of an improved interconnecting cord of this character which is moisture proof.

Under a great many conditions of operation of telephone switchboards it is found that the dampness in the atmosphere causes short circuits or partial short circuits between the conductors of the switchboard cords and thus creates considerable 'difliculty such as the improper transmission of the voice currents between two connected telephone instruments. To avoid the diificulties referred to the problem is thus presented of rendering a flexible switchboard cord moisture proof. I have devised a construction and arrangement of the various elements entering into the manufacture of a flexible switchboard cord by virtue of which this moisture proof quality is obtained. The cord is not only moisture proof when first produced, but retains its moisture proof qualities even under the severe conditions imposed upon it due to its flexible character.

I will describe one form of cord which may be constructed in accordance with my invention by referring to the accompanying drawing in which.

Figure 1 is a side elevation of a cord partly unwrapped showing the wrappings in the relation which they bear to each other in my improved structure, and Fig. 2 is an enlarged sectional view on line a-a of Fig. 1.

My improved cord construction as herein disclosed consists in the building up of a flexible moisture proof cord by superposing a plurality of layers of material each having its peculiar function. i

The core of the cord consists of a plurality of preferably longitudinally extending copper tinsel conductors 1. About this is wrapped a helical steel conductor 2 in elec- Patented Feb. 6, 1917.

Application filed May 24, 1915. Serial No. 30,057.

trical contact with the copper tinsel, both together forming the inner conductor. About this inner conductor formed of the parts 1 and 2, I wrap acovering 3 of silk, linen, cotton, wool, or material of that nature, having therequisite'insulating characteristics, and-this insulating covering of the inner conductor maybe in the form of wraps or braids as is found most serviceable.

' About this insulating shell 3; I "arrange 'a second conductor of the cord which consists of tinsel 4 preferably braided about the insulating covering 3. A helical steel conductor 5 then surrounds the tinsel conductor 4, being in electrical contact therewith and the two together forming the second conductor of the cord. The cord thus consists of two conductors as shown. In the event of the requirement of three or more conductors, the construction above described can be re peated and in practice I have built up cords of more than two conductors following the lines above laid out. Herein however I am describing merely a two conductor cord as that will be sufficient to illustrate my invention. About the steel cord-5 with its associated tinsel 4 I then arrange a wrapping of insulating material 6which may be silk, cotton, wool, or linen,-or similar material, but which in the particular cord under consideration consists of silk, which is treated with an impregnating wax or moisture proofing material of suitable characteristics so as to resist moisture. About this moisture proof wrapping I then provide an outer or external braid or covering which is customary and which may either be of silk, cotton, or linen or similar material as the occasion may demand. The ends of the cord may then be provided with suitable terminals if desired or the conductors may be brought out without terminal attachments to fit the requirements of various connecting devices to which the cord may be attached.

I have found that the particular arrangement of the moisture proof wrapping in the manner shown in the drawing about the second conductor retains its moisture proof characteristics even under the severe conditions imposed by the flexible character of the cord when in use.

From the above description the nature of my invention will be readily clear to those that modifications may readily be made within: the scope of the appended claims without departlng from the spirit ofiny invention.

Having-however thus described" one form Which my invention may take, W-liatl claim as new and desire to secure by Letters Patent is:

1.,A flexible switchboard cord consisting ing. protectingi covering about" said wrapping;.thereby v forming; a' pliable and flexible multiple conductingcordu 4 c opiea "on thii patent may be obtained tor 2. A flexible switchboard cord consisting of a flexible inner conductor adapted to form part of" an electric circuit, a concentric fieX- ible outer'cond'uctor adapted'to form part of an electric circuit, said conductors being concentric and helically wound, insulation between said conductors, a layer of insulating material impregnated with a moisture proof compoundsurrounding said OlltQFCOl'ldllCtOI, and a flexibleinsulating protecting covering about said moisture proof layer, thereby forming a pliable: andi fieX-iblemultiple con ducting' co rd: 7

In Witness whereof, I hereunto subscribe my name this-5th day of May, A. D, 1915..

. WILLIAML. RUNZ'EL.

Witnesses:

- HnzEnA-I. J'oNEs, MAX W. ZABEL.

five cents each,. by.- addressing the Commissioner cilia-tents, Washington, D. 0.

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