US2113489A - Bracket for wire - Google Patents

Description

April 5, 1938. Q Q NECK I $113,489

BRACKET FOR WIRE Filed March 12, 1936 M y I Patented Apr. 5, 1938 UNITED STATES BRACKET FOR WIRE Gustav 0. Neck, Nossebro, Sweden Application March 12, 1936, Serial No. 68,536

In Sweden May 10, 1935 i 2 Claims.

- This invention relates to high tension electric mains and especially to such electric aerial mains which are supported by a series of poles some of which are provided with means for staying of the :3 line. More specifically this invention relates to the brackets which serve to clamp the conductor with an appropriate tension on such stay poles. Such brackets as hitherto manufactured usually are made of malleable cast-iron or of some metal 10 alloys such as gun metal or the like, but experience has shown such materials to be unsatisfactory for sustaining the heavy strains to which the brackets are subjected.

The object of this invention is to provide for brackets of the class mentioned which are extraordinarily resistant to heavy strains so that they do not break or twist especially when they are subjected to the stresses exerted during the stretching of the conductor while mounting.

Another object of this invention is a process for the manufacture of such brackets of malleable steel which will be very cheap and convenient so that the malleable brackets can be readily completed in a few stages for a price not exceeding :25 that one for cast brackets.

In carrying the invention into effect I take a steel plate and heat it to a proper forging heat, whereupon the blank is treated in a forging press in one or several stages until it has attained the desired shape. During this forging process certain portions of the blank are subjected to special treatments so as to render them capable of resisting the stresses to which they are subjected.

The accompanying. drawing illustrates an ap- 5 proved embodiment of the invention, in which,

Figure 1 is a sectional elevation view of the improved bracket with a wire clamped there- Figure 2 is a cross section on the line II in Figure 1,

Figure 3 shows the upper portion of the bracket in direction of the arrow in Figure 1,

Figure 4 is a longitudinal section of the por- 45 tion shown in Figure 3 taken on the line II-II in Figure 3,

Figure 5 is a partially broken elevation view of the bracket showing the attachment of a suspension link, and

50 Figure 6 is a horizontal view of a portion of the bracket.

Figure 5 is drawn on a smaller scale than are the other figures.

In a known way the bracket is composed of 55 two parts, namely, a channel shaped shoe I and a T shaped clamping member 3 adapted to be attached to the shoe 1 by means of U-shaped bolts 4 or the like with the web of the T positioned in the channel of the shoe piece thereby firmly clamping a wire 12 against the bottom of the '5 channel (see Figures 1 and 2). By means of a link 2 and a bolt 10 going through a hole H in the web 6 of the bracket the latter is suspended movably on one of the poles for the electric main (see Figure 5). 10 To facilitate the manufacture of the bracket, especially the shoe 1, of malleable iron it is indispensable that the shoe is given as plain and simple configuration as possible so that it can be forged from a flat plate. To this end the shoe l when completed is given a cross sectionof substantially the shape of the letter U with a channel-like upwardly arched bottom 5 (see Figure 2). The inner side of each of the two webs 6 of the U serves as an outer side sup-port for one of the 2 two suspension links 2, while the outer side of the arched bottom 5 serves as support for the curved portions of the U-shaped fastening bolts 4 of the clamping member 3.

The two parallel suspension links 2 pass each through a slot 8 in that portion of the bottom of the U-section which is disposed between the arched channel bottom 5 and the adjacent side web 6 of the shoe. The bottom edge 9 of said slot 8 (Figure 3) serves as an abutment for the underside of the respective link 2 so as to limit the swingings of the bracket in relation to the links (Figure 5). In order to increase the supporting surface of said bottom 9, the material of the shoe is increased in thickness at this point as clearly 5 visible in Figure 4. The side supporting of the links 2 is improved by reducing the width of the shoe in the region of the slots 8 as illustrated in Figure 3, whereby the two links 2 are caused to substantially contact with the inner sides of the webs 6 and thus prevented from lateral movements.

To insure reliable fastening of the wire l2 between the bottom of the central channel in shoe l and the edge of the web of T clamping member 3, the operative edge of said web is corrugated as is also the cooperating portion of said channel bottom, so that the corrugations of said two parts interfit (Figure 1).

The tail end of member 3 in a known way is shaped as a bent guide for the wire l2 as indicated at I3.

Having thus described how the bracket is designed, I will explain the manufacture thereof,

especially as it concerns the shoe I. This is accomplished by heating the blank to forging heat and subjecting it to successive forgings in a strong press.

In the first stage the central channel 5 is forged from the fiat blank plate, whereupon the U-shape is completed. Now the curved upper end M of the blank is bent some degrees on a rather large radius, and in the same process those portions of the side webs 6 of the U section which are disposed within the region of said curve are given a somewhat larger width or height than the height of the webs of the remaining portion of the shoe. During the bending of the curved end l4 the material at the adjacent portions of the webs 6 is thickened and by flattening these portions, the width of the Webs is increased as shown in Fig. 1. This widening is increased by the simultaneous compressing of the U-section to the size illustrated in Figure 3. Further, the webs 6 are subjected to a stretching force when cooled so that the material attains a greater hardness than it has in the arched central channel 5. The advantage of that will be that those portions of the shoe l namely, the webs 6 which, when in use, are subjected to substantially bending stresses, are given an increased strength simultaneously as the central channel 5 against which the wire I2 is clamped by the clamping member 3, remain sufficiently soft so as to assist said clamping effect.

Having shaped the shoe as above described, the slots 8 are forged out, being initially formed of a length less than in the finished product. Thereafter pressure is exerted on the bottom edge 9 of the slot in the longitudinal direction thereof until the slot has obtained its desired length. The compression of the material by this pressing force acts to increase the width of the bottom 9 as mentioned above and illustrated in Figure 4, simultaneously as the hardness of the material is increased as a result of the compression. Thus, this part will be more capable of withstanding the heavy pressures on it from the suspension links 2 during the stretching of the main l2.

Finally the corrugations in the bottom of the central channel 5 are forged out and the holes for the various bolts drilled.

Having thus described my improved method and bracket, what I claim is:

1. A bracket formed of malleable steel for overhead electric conductors comprising a shoe member and a clamping member cooperating with said shoe member to clamp the conductor therebetween, said shoe member being substantially U-shaped in cross section and having an arched central channel in the bottom thereof, links pivotally connected to said shoe and adapted to suspend the bracket on a pole, the bottom of said U-shapecl shoe member on each side of the arched central channel having slots therein for the passage of said links, the inner side surfaces of the webs of said shoe member serving as side supports for said links.

2. A bracket as claimed in claim 1 having the width of the U-cross section of the shoe member reduced within the region of said slots for the suspension links whereby the inner sides of the webs of said shoe are disposed to serve as side supports for said links.

GUSTAV C. NECK.

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