US2406663A - Wire-transposing device - Google Patents

Description

-Al1g. 27, 1946. R CASE WIRE-TRANSPOSING DEVICE Filed April 6.,'.1944

2 Sheets-Sheet 1 Rogers Case y www 2Q? WM.

, M www INVENTOR Aug. 27,1946. R CASE 2,406,663

WIRE-TRANSPOS ING DEVICE Filed April 6, 1944 2 Sheets-Sheet 2 INVENTOR Patented Aug. 27, 1946 UNITED STATES PATENT OFFICE WIRE-TRANSPOSING DEVICE Rogers Case, Orange, N. J.

Application April 6, 1944, Serial No. 529,805

4 Claims. 1

This invention relates to a device for transposing the Wires of a communication line, and constitutes a specialized improvement over the transposition device disclosed in my co-pending application Serial No. 475,286, led February 9, 1943, issued August 29, 1944 as Patent No. 2,356,750 of which this constitutes a continuation-impart.

A problem encountered in the erection of communication lines adapted to convey messages by the carrier system, is that such system requires transposition oi the two paired line wires at definite minimum intervals throughout each section or division of the system. If, as is usual,

transposition brackets are mounted on the line poles which support between them reaches of the communication wires, it is necessary for satisfactory carrier communication that the poles be spaced no further than the required minimum distance. Such exact spacing of the poles is, in many localities, extremely diicult or even impossible. In converting from the phantom system to the carrier system, the problem is even greater because poles have already been set and some oi them are always set throughout any extended stretch of line in accommodation to local conditions rather than to proper spacing. Exact spacing under such circumstances, therefore, would require withdrawing poles which have already been set and replanting them in accordance with a requirement, which is of itself frequently difficult or impossible to meet.

The transposition device, or bracket, disclosed in my above-identied application, and which may be considered to be my standard form of bracket, consists of a single frame element freni each of the opposite sides of which project two insulators, the four insulators of the bracket being mounted in approximately rectangular arrangement, and the two insulators on each side of the frame, or base, element being arranged diagonally. The insulators may be of any suitable spool form and made of porcelain, glass, or other suitable insulating material.

A transposition bracket, such as that disclosed in my above-identied application, serves to transpose the line wires in such manner as to preserve equal length and weight of copper in the reaches extending on both sides of the transposition point, and is arranged to separate the two wires, which normally are uninsulated, a substantial distance in their mounting on the bracket.

The primary object of my present invention is to provide a transposition bracket which, While generally satisfactory to eiect the transposition under straight line arrangement of the line wires, whichV is most commonly encountered, serves approximately to equalize the reaches off two paired wires extending between poles under special circumstances; namely, when two poles are placed close together in a locality at which an abrupt change in the direction oi the line is made.

Another object of my invention is to provide for so doing by means of a transposition bracket which is simple and sturdy in its structure, and in which the arrangement of the insulators is such as to space Vthe wires substantially from each other in one plane when they are brought close together in another plane for transposition.

In eiecting this purpose, I place the insulators of the bracket in symmetrical arrangement with respect to the transverse central line of the bracket; with two of the cooperative insulators mounted on opposite sides of the base element of the bracket and widely spaced from each other along the base of the bracket, and with the other two insulators mounted on' opposite sides of the base close to the transverse central line of the bracket, and preferably in vertical axial alignment with each other in a position offset from a line passing through the axes of the first pair.

In the accompanying drawings illustrative of my invention:

Fig. 1 is a plan View of my transposition dei vice, or bracket, showing two line wires transw posed by the bracket.

Fig. II is a side elevational View of the bracket.

Fig. III is a cross-sectional View through the bracket taken in the plane of the section line III- III of Fig. I.

Fig. IV is a schematic view illustrating the use of a bracket as shown in Figs. I to III inelusive of the drawings.

Fig. V is a similar schematic view showing the same bracket reversed in its mounting on the line wires.

Fig. VI is a schematic view analogous in its general arrangement to the showing oi Fig. IV, but showing a slightly modied form of bracket.

In the drawings, reference letter A designates one wire of the pair forming a communication line, and reference letter B designates the other conductor wire' of the line. These wires are shown uninsulated, as is usual in conductor wires oi that sort. The bracket structure has a base, or frame element, designated generally by reference numeral I, which desirably is a flat steel or iron stamping of substantial thickness, but

which may be made of any other metal or other material formed in any suitable manner, provided, however, that it has in the bracket a stiffness and tensile strength closely approximating that oi a substantial steel stamping.

On the base are two wire-contacting and wiretraining insulators 2 and 3, which are spaced apart along the base and which project from opposite sides thereof. These insulators may be of any desired form to provide specialized insulatine conditions in the assembly, but are shown as spool-form insulators of the simplest structure, having wire-receiving grooves 4. They are mounted by insulator pins 5 which are shown as bolt-form. The spaced-apart wire-contacting and wire- training insulators 2 and 3 need not be rotatable on the base. Offset from the spacedapart insulators 2 and 3, there is a second pair of wire-contacting and wire-training insulators 6 and l, which are mounted to project on opposite sides of the base l. As shown in Figs. I to V inclusive, these insulators 6 and 'l are arranged in vertical axial alignment by their mounting on a common bolt-form insulator pin 8. The vertically aligned insulators 8 and 1 are, as shown, of the same simple spool-form as the spacedapart insulators 2 and 3, and similarly need not be rotatably mounted.

In their mounting, the insulators are relatively so placed that the substantially spaced-apart insulators 2 and 3 are equidistant from the vertically aligned pair of insulators 6 and 1, and the last-named pair of insulators is spaced from a line passing through the axes of the mutually spaced-apart insulators a distance equal to the standard or desired spacing between the line wires in their reaches from pole to pole. As shown, the insulators 2 and 3 have their adjacent surfaces at which the wires turn spaced approximately that distance. All the insulators, like those of my above-identified standard bracket, may be made of porcelain, glass, or any other suitable insulating material.

It being understood that the transportation bracket is supported wholly by the line wires and serves additionally as a spacer and tightener for them, it may be worked into transposing position on the wires by manipulation and lateral insertion. This may be done from a pole, and the bracket then may be pulled into accurate transposing position by means of a come-along, or the like means for pulling the bracket along the wire. Referring to the drawings, it will be seen that the wire A is brought into contact with the uppermost insulator 6 of the vertically aligned pair to lie in the wire-reeciving groove 4 thereof, and is also trained around that one of the spacedapart insulators, namely the insulator 2, which lies on the same side of the base l. Similarly, the line wire B, which, for distinction, is indicated in dot and dash lines in the drawings, is trained around the insulator I of the vertically aligned pair, and around that one of the spacedapart insulators, namely the insulator 3, which lies on the same side of the base I. Consideration will show that this may be done wholly by lateral insertion, without cutting and splicing the wires.

It will be seen that as so trained on the bracket, the two line wires are spaced vertically from each other by being brought into upper and lower levels. One wire being trained wholly by the insulators on one side of the base and the other being trained wholly by the insulators on the other side of the base, this spacing in the vertical dimension is substantial. The closest hori- Zontal approach of the wires to each other is at the vertically aligned insulators 6 and 1, in which region they are spaced in the vertical plane by their position in the grooves of the insulators, and are insulated positively from each other by the insulator bodies in the grooves of which they lie.

Assuming the particular condition for which the transposition bracket of my present invention has specic utility, we will assume that the wire B is the inner and shorter wire leading from a crossarm from which the paired wires extend at a substantial angle to the adjacent reach of the wires. In order, therefore, that the transposition be so made as to give approximately equal Weight and length in the individual reaches of the wires between poles, the surfaces of the two vertically aligned insulators are mounted in line with this wire B.

This use of the bracket is shown in Figs. IV, V, and VI of the drawings, in each of which the wire B is the shorter length of wire extended between two crossarms 9 and I0, one of which 9 is at less than a right angle to the direction of the reach of paired wires; and A is the longer wire of the pair, In the arrangement of Figs. IV and V, both the vertically aligned insualtors 6 and 1 of the bracket C lie in the line, or individual reach, which normally would be composed wholly of the shorter wire B. The training of the wires A and B around the insulators is as previously disclosed with reference to Figs. I, II, and III. The substantially spaced-apart insulators 2 and 3 lie in the line which normally would be composed wholly of the longer wire A. There being no wire extended directly between the insulators 2 and 3, there is subtracted from that initially longer reach a length of wire equal to the distance between the points on these insulators at which the wires A and B are turned away from and brought into line. If we assume that the angularly disposed crossarm 9 is at an angle of from about 45 to the crossarm I0, this deletion of wire from the longer reach causes the actual wire in the two reaches closely to approach equality, with the dimensioning of the bracket as shown. If the angularity of crossarm 9 be moderately greater or less than 45 (the same relative dimensions of the bracket being retained) equality in the length of wire in the two individual reaches still will be approximated. For angles much less than 45, a bracket in which the insulators 2 and 3 are mounted closer together may be used, and for angles much greater than 45, a bracket having those insulators spaced further apart is desirable.

In the modied bracket of Fig. VI, designated D, the two insulators Ea and 'la are mounted on opposite sides of the base I, and close to the transverse center line of the bracket in symmetrical relation thereto. The spacing between the axes of these insulators 5a and 1d is so close as compared with the spacing between the axes of the insulators 2a and 3d of this modiied bracket, that the lengths of wire extended between them and the insulators 2d and 3a lie at a substantial angle to the transverse center line of the bracket. That is, the wire A is, as shown in Fig. VI, trained around the insulator 2a, which is the upper member of the pair of widely spaced insulators, and over the nearest insulator 6a of the closely spaced pair, which insulator also projects from the upper side of the base. Similarly, the wire B carries on below insulator 6a to insulator la of the closely spaced pair and from it is trained around the inescasas sulator 3a, which is the insulator of .the widely spaced pair which lies closest to it, 'and also projects from the under side of the base. It will be seen in Fig. VI that although each of the wires is extended between the nearest insulators o'f the two pairs, without crossing the wires, the lengths of wire extended between the insulators lie at a substantial angle to the transverse center line of the bracket, because of the relatively great difference in the symmetrical spacing of the insulators composed of the two pairs with respect to the transverse center line of the bracket. Although this angularity is not so great as when the insulators are brought directly into the transverse centerline, it is as shown adequate firmly to engage the bracket in the line.

The modified bracket of Fig. VI thus illustrates that a moderate symmetrical separation of the insulators oi one pair from the vertically aligned arrangement of Figs. I to III inclusive is permissible. When arranged as shown, it suitably may be used when the dimensions of the bracket are altered by increased spacing of the more widely spaced insulators in accommodation to an inequality in the length of the reaches caused by an angularty of one cross-arm substantially greater than a 45 angle with a perpendicular to the line. This modified form of bracket presents advantage in its physical balance, but requires a more extended width of the base structure on which to mount the closer insulators than if they both are brought directly into the transverse center line of the bracket.

It will be clear that either form of my transposition bracket will serve the paired wires of a communication line in the absence of any change in direction, by placing the brackets in closely spaced relation in the line and by reversing the mounted position of adjacent brackets, For this purpose, however, it is to be considered in measure less desirable than my standard form of transposition bracket, for the reason that (even in the mcdiiied form of Fig. VI) the physical strain on the bracket caused by the pull of the wires is not so well balanced as in my previous structure, and because a greater number of brackets desirably is used.

The transposition bracket as so far described may be used satisfactorily provided the insulator pins are made of high-carbon heat-treated steel to sustain the pull of the wires. Desirably, however, the insulators are, as shown, reinforcingly supported as by bracing straps. Each such strap H is Shown in the drawings as an angular member having a pe forate foot Ila, which extends over the top of its associated insulator t0 lie under the head of the insulator pin; and a perforate foot i ib, which is secured to the base I as by riveting. It will be noted that the several straps II extend opposite those surfaces of their associated insulators which contact the line wires, so that they do not interfere with the positioning of the bracket, and do oppose the pressure of the wires on the insulators. The provision of the described braking straps is equally desirable in the modiiied form of bracket shown in Fig, VI as in the preferred form shown in Figs. I to III inclusive.

Desirably, for purposes of lightness and economy but not essentially, the base l of the bracket is so cut away that it is of an approximate E- shape, with the spaced- apart insulators 2 and 3 mounted on the base portion la of the EL with relatively short legs ib and lc arranged to mount the bracing straps li; and with a longer central leg ld carrying the vertically aligned insulators 6 tf and l and providing anchorage for their bracing straps. In the modification of Fig. VI, the central leg (d is made of increased width, to permit the slight horizontalr spacing of the insulators 6a and la.

Having described a specific embodiment of a transposition bracket in accordance with my invention, it is to be understood that the invention herein is not to be strictly limited t0 the specific structural ils as shown and described, but that changes in structure and arrangement coming within the bounds of the appended claims may be made without departing from the invention as deiined therein.

I claim as my invention:

1. A transposition bracket for mounting on paired line wires comprising a rigid insulatorcarrying base, and two pairs of wire-contacting and wire-training insulators mounted on said base with the insulators of each pair arranged symmetrically with respect to the transverse center line of the base to project oppositely from the plane of the base; the insulators of one said pair being widely spaced from the transverse center line of the bracket, and the insulators of the other pair being mounted in vertical alignment in the transverse center line of the bracket, so that with the bracket mounted by lateral insertion across the line to transpose the wires thereof the widely spaced pair of insulators lies in one reach of the line and the vertically aligned pair lies in the other reach thereof with the two line wires transposed by the training of each on two insulators which project from the same side of the base.

2. A transposition bracket for mounting on paired line wires comprising a rigid insulator.

carrying base, and two pairs of wire-contacting and wire-training insulators mounted on said base with the insulators of each pair arranged symmetrically with respect to the transverse cens ter line of the base to project oppositely from the plane of the base; the insulators of one said pair being widely spaced from the transverse center line of the bracket, and the insulators of the other pair being mounted each `at least so close to the transverse center line of the bracket that with the bracket mounted by lateral insertion across the line with the widely spaced pair of insulators in one reach of the line and the other pair in the other reach thereof and with the two line wires transposed by the training of each on two insulators which project from the same side of the base, the wires extended in uncrossed relation between the insulators lie at substantial angles to the transverse center line of th bracket.

3. A transposition bracket for mounting on paired line wires comprising a rigid insulatorcarrying base, two pairs of wire-contacting and wire-training insulators mounted on said base with the insulators of each pair arranged symmetrically with respect t0 the transverse center line of the base to project oppositely from the plane of the base; the insulators of one said pair being widely spaced from the transverse center line of the bracket, and the insulators of the other pair being mounted in vertical alignment in the transverse center line of the bracket, so that with the bracket mounted by lateral insertion across the line to transpose the wires thereof the widely spaced pair of insulators lies in one lreach of the line and the vertically aligned pair lies in the other reach thereof with the two line wires transposed by the training of each on two insulators which project from the same side of the base, and bracing members organized with the said insulators in mounted position to resist the thrust of the line Wires thereagainst.

4. A transposition bracket for mounting on paired line wires comprising a rigid insulatorcarrying base, two pairs of wire-contacting and Wire-training insulators mounted on said base with the insulators of each pair arranged symmetrically with respect to the transverse center line of the base to project oppositely from the plane of the base; the insulators of one said pair being Widely spaced from the transverse center line of the bracket, and the insulators of the other pair being mounted each at least so close to the transverse center line lof the bracket that with the bracket mounted by lateral insertion across the line with the Widely spaced pair of insulators in one reach of the line and the other pair in the other reach thereof and with the two line wires transposed by the training of each on two insulators which project from the same side of the base, the Wires extended in uncrossed relation between the insulators lie at substantial angles to the transverse center line of the bracket, and bracing members organized with the said insulators in mounted position to resist the thrust of the line wires thereagainst.

ROGERS CASE.

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