US1640828A - Metal cross arm for supporting electric conductors - Google Patents

Description

. 1,640,828 Aug. 30, 1927. L'IH- HARDIN METAL CROSS ARM FOR SUPPORTING ELECTRIC CONDUCTORS Filed March 10, 1925 2 Sheets-$heet 1 Q I/VVE/V Toff L. /7. Hav ng/44 1,640,828 Aug- H. HARDIN METAL CROSS ARM FOR SUPPORTING ELECTRIC GONDUCTORS Filed March 10, 1925 2 Sheets-Sheet 2 firm/MEX Patented Aug. 30, 192 7. I p UNITED STATES.

LEWIS HAMIL ON mmnm, or CHARLOTTE, NORTH CAROLINA," AssIenon To,

SOUTHERN ELECTRICAL EQUIPMENT (30., A CORPOR KTION OF NORTH CAROLINA.

METAL CROSS ARM FOR SUPPORTING ELECTRIC CONDUGTORS.

Application filed March 10, 1925. Serial 'No. 14,562.

The'object of my invention is to provide an improved metal cross-arm for supporting high power wires; to provide a crossarm which is easy to assemble; which has provision for an overhead ground wlre; which provides improvedmeans for ad ustment; which is adapted for use on lrregular or crooked poles; and to provide a crossarm which can be manufactured at a relatively small' cost without requiring machining or diflicult bending. It isalso an object of my invention to provide a crossarm which can be assembled by use of bolts and need not be shop-assembled beforeshipment, thus reducing transportation costs. I attain these and other objects of my invention by the'device illustrated in the accompanying drawings, in 'which- Figure 1 is a front view of a smgle crossarm assembly constructed in accordance with my invention;

Fig. 2 is a side or edge view of same;

Fig. 3 is a top plan view of same;

Fig. l is a front view of a double crOssarm assembly constructed in accordance with my invention;

Fig. 5 is a-side or edge plan view of the double cross-arm assembly illustrated in Fig. 4; and.

Fig. 6 is a top plan view of the double cross-arm assembly.

Like numerals and characters indicate like parts in each of the severalviews.

Referring to the accompanying drawmgs, I provide a metal cross-arm 2 fastened to pole 1 by bolt 6 and braced by a V-shaped brace 3, the ends of which are fastened by bolts 4 to the cross-arm while its'central portion is fastened by bolt or spike 5 to the pole 1. Cross-arm 2 carries insulators 7 which are adjustably fastened to it as by bolt 8.

I provide an upper cross-arm 9 to which an insulator is adjustably bolted by bolt 8, the arm 9 being fastened to pole 1 by bolt 10. I provide a bayonet 13 fastened to upper cross-arm 9 by bolt 12 and having an inwardly slanting section, the lower end of which is fastened to the pole by spike 1 1-. A ground wire A is suitably secured to the lower end of the bayonet 13.

The cross-arm 9 has the portion 15 thereof between the pole 1 and the bayonet 13 bent in a slanting direction, as shown in Fig. 3 so that its end will engage and can be upper cross-arms 9 carrying a similar v tion.

fastenedto bayonet 13by the bolt 12. Bay- 7 onet 13 carries a Belcher clamp on itsupper end,-as shown. Referring to Figs. 4-6 there 1s illustrated a double cross-armassembly for which I use a plurality of cross-arms 2 and a plurality of braces.3 mounted on op-. posite sides ofthe pole and connected by a plate 20 which is bolted to. one of the cross 7 to the c1'0ss-arm supporting it. I also proporting it. I also provide a plurality of plate 20 fastened in place by bolts 8.

I also provide an angle plate 17 fastened by bolts 19 to the ends 15 of cross-arms 9 by i 7 bolt 18 to the bayonet 13, as shown in Figs.

Cross-arms'9 which engage bolts 19 a are slotted at 22, so as'to allow adjustments H along with slot 16, for bolt 12 for horizontal adjustment of bayonet 13. m

It will be noted that the cross-arms .9 are .vide a plurality of upper cross-arms suparranged in a pair, one on each side of the pole, and that each side of the; pole, and that each arm is adjustably secured to the bayonet 13 by bolt 12 which engages in the slot 16 in cross-arm 9, as shown in Fig. 4:. A similar adjustment may be provided for the single cross-arm assembly.

The manner of mounting the cross-arms on the pole will be apparent from the foregoing description and the accompanying drawings. A single cross-arm assembly, as shown in Fig. 1, may be readily converted into a double cross-arm assembly by the addition of the small plates 20 and 17, of which only three are required, the other standard members requiringno change in construc- The device is well adapted for use on poles that are crooked or irregular in shape as the slot 16 in cross-arm 9 permits of horizontal adjustment of the bayonet 13 to the point where it will best fit on the part of thepole 1 used. No templates are re quired for drilling mounting holes in the pole and the cross-arm is easy to assemble. The relative position of the assembly with regard to the top of the pole is not fixed. The device may be used on any voltage and spacing and has provision for an overhead ground wire. It is assembled by the use of bolts and spikes and does not need to be shop-assembled before shipment. It can be bledin the field. This tends to reduce transportation costs substantially. The device is fabricated entirely from commercial steel sections of stock sizes and no machining or difficult bending is required. The manufaoturing cost over that of similar devices previously patented is thereby reduced.

What I claim is:

1. A horizontal upper cross arm adapted to be fastened to a pole, said arm being adapted to carry an insulator and having the end distant from the insulator bent laterally beyond the point where the arm is bolted to the pole, a bayonet to an intermediate portion of which the bent end of the cross arm is bolted, said bayonet hav ing the portion below the cross arm bent inwardly toward the pole, the end being adapted to be fastened to the pole.

2. A horizontal upper cross arm adapted to be fastened to a pole, said arm carrying an insulator at one end, and having the op posite portion bent laterally beyond the point where the arm is bolted to the pole, an upwardly extending bayonet to an intermediate portion of which the laterally bent end of the cross arm is adjustably bolted for adjustment longitudinally of the cross arm, said bayonet having the portion below the cross arm bent inwardly toward the pole, the end being adapted to be fastened to the pole.

3. In a double cross-arm assembly, the combination of a pair of upper cross-arms lying in the same horizontal plane and adapted to be fastened to opposite sides of a pole, a bayonet to which one end of each of the cross-arms is adjustably at tached, the bayonet having its lower end lying in a plane parallel with the pole and adapted to be fastened thereto.

4. In a double cross-arm assembly, the combination of a pair of cross-arms lying in the same horizontal plane and adapted to be fastened to opposite sides of the pole, a bayonet to which one of the cross-arms is attached, the bayonet being adapted to be fastened at its lower end to the pole, and an angle plate extending between the crossarms and adapted to be bolted to the bayonet and to each of the cross-arms.

5. In a double cross-arm assembly, the combination of a pair of cross-arms lying in the same horizontal plane and adapted to be bolted to a pole, a plate supported on the cross-arms and bolted to one of them, a pair of insulators mounted on the plate one of said insulators being bolted both to the plate and to one of the cross-arms, the cross-arms having their other ends bent in a slanting direction towards each other, an angularly bent bayonet adapted to be fastened at its lower end to the pole, the crossarms having a horizontal slot, the bayonet being adjustably fastened to the aforesaid bracing plate extending from one cross-arm to the other and to which both the crossarms and the bayonet are fastened.

LEWIS HAMILTON I-IARDIN.

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