US2634313A - Line wire transposition bracket - Google Patents

Description

A ril 7, 1953 F. e. RIDGERS 2,634,313

LINE WIRE TRANSPOSITIQN BRACKET Filed April 21, 1951 2 swam-swam 1 INVENTOR ATT Y April 7, 1953 F. G. RiDGERS 2,634,313

LINE WIRE TRANSPOSITION BRACKET Filed April 21, 1951 2 SHEETS-SHEET 2 latented Apr. 7, 1953 LINE WIRE TRANSPOSITION BRACKET Frederick G. Ridgers, Hamilton, Ontario, Canada,

assignor to N. Slater Company Limited, Hamilton, Ontario, Canada Application April 21, 1951, Serial No. 222,186

1 Claim.

My invention relates to a transposition bracket for communication lines.

The principal object of the invention is to provide an improved transposition bracket, mainly in that it will better resist deformation than do other known brackets.

Another object of the invention is to provide a transposition bracket which will be as strong as, though lighter than other known brackets.

In the drawings, wherein is shown the preferred form of my invention,

Figure 1 is a top plan view;

Figure 2 is a side elevation of Figure 1;

Figure 3 is a section on line 3--3 in Figure 1;

Figure 4 is an end elevation of Figure 1;

Figure 5 is a perspective view; and,

Figure 6 is another perspective view showin the application of the bracket.

Referring now by numerals to the drawings, 3 shows the transposition bracket in general in Figures 5 and 6. The bracket is adapted to support four insulators S. As is well known, such a bracket is secured to a pole cross-arm C where two wires of a line are to be crossed over. So crossing the two wires is known as transposition.

Where the two wires cross, a certain minimum distance must be provided between them, and such selected distance must not be varied. The bracket must therefore be rigid, so that it will not be bent or deformed, as otherwise the selected horizontal spacing between the two wires or the clearance or distance between them where they cross, will vary with the variations in the line tension.

The clearance between the two wires, where they cross, is determined by the vertical position of the two insulators, to which one line WI is attached, relatively to the vertical position of the other two insulators to which the other line W2 is attached. Accordingly, the practice has been to provide portions of the bracket so formed as to provide mounts or perches for the support of the pins, mounting the insulators, in their required relative elevations or levels.

The bracket B, aforesaid, is preferably formed from a substantially rectangular fiat steel plate or blank 10 having a middle portion H preferably provided with a substantially central elongate aperture l2 to prevent excessive accumulation of snow. The plate is adapted to rest upon the cross-arm, to which it is secured by bolts through holes Hi.

The diagonally opposite corners of the plate are formed with raised or stepped-up portions [5, while the other two corners are formed with lowered or stepped-down portions 16. Anchored to and vertically supported by these portions or pin mounts l5-i6 are conventional metal pins P, holes 14 being provided to locate and receive the pins.

The portions 15 are stepped up by bending the corresponding corners of the plate first upwardly as at l8, and then horizontally, that is, in a plane parallel with the plane of the plate. These riser portions or webs l8, by which the plate merges with the portions 16 and which are substantially ogee shaped in cross-section, in effect act as ribs tending to resist deformation of the bracket.

As is known, the resultant pull on any one pin is not at right angles to the cross-arm, nor parallel therewith, but an angle less than to the cross-arm. This may be best explained by reference to Figure 1 wherein the line Ti and T2 represent the direction of the opposite pulls on the pin, and the line B, the direction of the resultant stress (the angles 11-11 are equal), this stress being in a plane bearing an angle to the general vertical plane of the web 18. While the portion 15, outwardly of the rib it, tends to distort, the web on the other hand prevents any substantial distortion of either the portion IE or the plate inwardly of the web.

The two lower portions or pin mounts it are formed by bending the plate downwardly as at 20, and then horizontally or in a plane parallel with the plane of the plate, the portion 20 also serving as a strengthening rib. Obviously, the explanation applying to the pin mounts l5 and Webs l8 similarly applies to the stepped-down pin mounts I6 and webs 20.

The end edges defining the central aperture l2 are curled downwardly, in effect to provide a transverse rib 22 which serves to resist bending or deformation of the plate transversely of the longitudinal axis of the plate.

What I claim is:

A transposition bracket pressed from a sub stantially rectangular fiat metal blank and comprising, a middle portion presenting a substantially flat face adapted to be laid upon a crossarm, said middle portion having a substantially rectangular aperture, and substantially triangular shaped corner portions oifset from the plane of said fiat face and forming supports for insulator pins, those of said corner portions disposed diagonally opposite each other constituting pairs, each said pair lying on opposite sides of the plane of said flat face, and at least two of the edges defining the aperture being curled to provide ribs.

FREDERICK G. RIDGERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,840,362 Hunter et al Jan. 12, 1932 1,840,740 Ramsey Jan. 12, 1932 2,170,006 Brandt Aug. 22, 1939

Images