US2156447A - Double cross-arm brace - Google Patents

Description

y 2, 1939- c. A. BOOKER ET AL ,447

DOUBLE CROSS-ARM BRACE Filed Nov. 8, 1957 f 1 76 07152 9 40 649/7214 .7500/ke7 Avd'rew 55ZZ&.

J" 42 MM Patented May 2, 1939 UNITED STATES PATENT OFFICE 2,156,447 DOUBLE CROSS-ARM BRAoE Application November 8, 1937, Serial No. 173,328

4 Claims.

This invention relates to pole and cross-arm constructions, as used in supporting transmission lines, distribution lines, or telephone or telegraph wires.

It is the general object of our invention to provide an improved double cross-arm brace for such purposes, so designed that it can be conveniently constructed from a single continuous piece of rolled steel rod.

Another important object of the invention is to provide a double cross-arm brace so designed that the surface thereof is free from corners, holes or other inequalities, thereby insuring a better and more uniform deposit of metal in galvanizing and reduced liability to rust.

Another very desirable characteristic of the invention is that it is so economical in the amount of metal used and in the manner of fabricating the same that our improved brace may be manu- 20 factured from such ferrous or non-ferrous metals and alloys or combinations thereof as will best resist corrosion, in regions near the seat or where galvanizing is not satisfactory.

A further object is to provide a double cross- 2 arm brace which requires no separate bolts or screws for attachment thereof to a cross arm. In a modified construction, no attaching devices whatever are required between the brace and the cross-arm.

30 Our invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention and certain 35 modifications thereof are shown in the drawing,

in which Fig. 1 is a front elevation of our improved cross-arm brace in operative position;

Fig. 2 is a plan view, looking in the direction of the arrow 2 in Fig. 1;

Fig. 3 is a sectional end elevation, taken along the line 33 in Fig. 1;

Fig. 4 is a partial sectional view, looking in the direction of the arrow 4 in Fig. 1;

Fig. 5 is a partial front elevation of a modified construction; and

Figs. 6 and '7 are similar fications.

Referring particularly to Figs. 1 to 4, we have shown a pole l? having a cross-arm C secured thereto by a lag screw or bolt 10, these parts being of the usual construction.

Our improved cross-arm brace B is shown as formed from a single continuous piece of relatively heavy round steel rod, and comprises two views of further modiarms l2 joined together by a loop or coil M, as

clearly shown in Fig. 4. This loop or coil is of such internal diameter as to freely admit a lag screw or clamping bolt [5 by which the brace may be secured to the pole P. The overlapping 5 portions of the arms l2 in the loop or coil [4 may be welded together to provide a more rigid construction if desired.

The outer ends of the arms l2 are offset as indicated at 16 and are threaded at their outer ends to receive clamping nuts H.

The parts are assembled as indicated in Figs. 1 to 3, with the offset portions l6 extending through horizontal holes in the cross arm C at opposite sides of the pole P. Washers I8 are preferably inserted under the nuts I! as shown in the drawing. Other suitable means for securing the offset portions IS in the cross-arm C may be substituted if desired.

From the foregoing description it will appear that we have provided an extremely simple double cross-arm brace which may be manufactured from ordinary round steel rod by a. few simple and inexpensive operations. This brace is not only low in cost of manufacture, but is highly satisfactory in use and extremely easy to install.

In Fig. 5 we have indicated a modified construction in which the outer end of each arm 20 of the double brace is offset to provide a horizontal shoulder 2i and is again offset to provide an upwardly extending end portion 22 adapted to be inserted in a hole 23 bored into the cross-arm C from the under side and extending only partially through the cross-arm.

The double brace thus constructed can be held in place by a single lag screw or clamping bolt, and each of the arms 20 is placed in compression by the load carried on the adjacent portion of the cross-arm.

In Fig. 6 we have shown a similar construction but with the end portion 3| of each arm 30 of the brace extending entirely through the crossarm C vertically and secured by a nut 32, threaded tothe upper end thereof. With this construction, each brace arm 30 is adapted to resist tension as well as compression.

In Fig. '7, we have shown an alternative construction in which the arms 40 are joined by a flat loop or bent portion 41, the sides of which are preferably welded together at 42.

Our improved cross-arm brace, while commonly made from steel rod, may be made of any other suitable metal or alloy and with or without a protective coating.

It is to be noted that no waste material whatever is produced in manufacturing our improved brace, so that more expensive metals can be economically used. Furthermore, the cross section of the brace is commonly uniform throughout its length including the threaded end portions, so that the labor cost of manufacture is correspondingly low. 7

Having thus described certain forms of our invention and the advantages thereof, we do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but What we claim is:

1. A double cross-arm brace comprising a single piece of metal rod, said brace having two brace arms connected by an integral bolt-receiving loop, and said brace arms having integral oiTset end portions extending into spaced openings in said cross-arm.

2. A double cross-arm brace comprising a single piece of metal rod, said brace having two brace arms connected by an integral bolt-receiving loop, and said brace arms having integral oflset end portions extending through spaced openings in said cross arm, and means to secure said end portions in said cross-arm.

3. A double cross-arm brace comprising a single piece of metal rod, said brace having diverging brace arms joined by a single-turn integral helical loop, and said brace arms having offset end portions extending into spaced openings in said cross-arm.

4. A double cross-arm brace comp-rising a single piece of metal rod, said brace having diverging brace arms joined by a single-turn integral helical loop, and said brace arms having offset end portions extending through spaced openings in said crossarm, and means to secure said end portions in said cross arm.

CLYDE A. BOOKER. ANDREW E. HILL.

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