US269328A - Island - Google Patents

Description

PATENT OFFICE.

WILLIAM H. SAWYER, OF PROVIDENCE, RHODE ISLAND.

ELECTRICAL CONNECTING-CORD.

SPECIFICATION forming part of Letters Patent No. 269,328, dated December 19, 1882.

' Application filed August 23, 1882. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM H. SAWYER, a citizen of the United States, residing; at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Electrical Connecting-Cords; and I do declare the following to be a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

This invention relates to an improvement in that class of electrical conductors known as tinsel connecting-cords," and used for connetting telephones in circuit, making switchconnections, and for other similar purposes within doors. These connectingcords have heretofore been comppsed of around braid or twist of tinsel threads inclosed in a tubular trainer cotton, woole'u,' or other non-conduct- "ing fibrous material. Thdydia've great flexibility, for which they are chiefly valued, are

non-elastic, and answer very well for conducting high-tension magneto-electric currents, for which purpose they have been mainly employed, but are found to have too great resistance for general use in connecting up all kinds of electrical apparatus.

It is the object of my invention to provide a braided connecting-cord which shall have less resistance in proportion to size than those of the old style referred to, and be capable of usein conducting freely all kinds of electricalcurrents, while also being amply flexible, strong, and non-elastic.

The invention consists in an electric..l connecting-cord having a core composed of an assemblage of fine copper or other highly-flexible metallic wires inclosed in a tubular braid of tinsel threads, which braid may or may not be in turn inclosed in a tubular braid of nonconducting fibrous material. The central core of fine wires is the main conductor of the cord, and these wires are bound together by the tu: bular braid of tinsel threads, which, in addition to their function of binding the wires together, add to the conductivity of the cord. The wires prevent the braid from having the objectionable longitudinal elasticity which it would have if used alone. The outer tubular braided covering of non-conducting material will protect the tinsel, and also preventcrosses and short-circuitingsbould a cord come in contact with other conductors or another cord.

Itwill be understood that by tinsel thread is meant a thread of fibrous material wound spirally with a very thin and flexible strip or thread of metal.

In the drawings, Figure 1 is a piece of a connecting-cord constructed according to my invention, without the outer non-conducting braided covering. Fig. 2 is a view of a similar cord provided with an outer non-conducting braided covering. Fig. 3 is a longitudinal central section of the cord shown in Fig. 2.

The letter A indicates the central core, which is an assemblage of any convenient number of naked highly-flexible metallic wires, preferably copper, in contact with each other.

Bis the tinsel braid which incloses thecorewires, the tinsel being in contact with adjacent wires; and O is the outer non -conducting braided covering, which, as before intimated, may be omitted, but the use of which is preferable as a protector and insulator.

In use a connecting-cord will usually be provided at each end with a metallic tip, with which both the core of central wires and the tinsel braid will be electrically connected. Such tips may be applied in any well-known or convenient manner, forming no part of my invention.

that I claim is- 1. An electrical connecting-cord having a core composed ofan assemblage of fine highlyflexible metallic wires inclosed in a tubular braid of tinsel threads, substantially as described.

2. An electrical connecting-cord composed of the following parts, namely: a central core consisting of an assemblage of fine highly-flexible metallic wires, a tubular tinsel braid inclosing said core and in contact with adjacent wires thereof, and an outer braided covering of nonconducting fibrous material, all arranged as shown and described.

In testimony whereofI affix my signature in presence of two witnesses.

WILLIAM H. SAWYER. Witnesses:

GILMAN E. J OPP, Tnos. A. MILLETT.

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