US 1018754 A
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. FORD POST.
APPLIGATIONVI'ILED NOV. 5,1910.
Patented Feb. 27, 1912.
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UNIED STATES PATENT OFFICE.
ARTHUR W. FORD, OF QUINCY, MASSACHUSETTS, ASSIGNOR TO HENRY T. P. BATES, OF QUINCY, MASSACHUSETTS.
Specification of Letters Patent.
Patented Feb. 27, 1912.
To all whom it may concern:
Be it known t-hat I, ARTHUR WV. FORD, a citizen of the United States, residing at Quincy, in the county of Norfolk and Commonwealth of Massachusetts, have invented cert-ain new and useful Improvements in Posts, of which the following is a specification.
In the construction of posts for the support of electric wires and the like, and par ticularly for the support of trolley wires, it is customary to build up the same from different sizes of metal pipes, in order that the same may have the taper required for the sake of appearance and economy in material. These sections of tubing are secured together in several ways, as by shrinking them together, threading one within the next larger, etc., but these are all open to various objections, such as expense, deterioration from rust, insufficient strength, and danger from short-circuiting.
The object of this invention is the construction of a built-up post which shall be free from all such objections.
Referring to the drawings forming part of this specification, Figure 1 is a vertical section of a post made in accordance with my invention. Fig. 2 is a similar section but on a larger scale, of a part of the post in the process of construction. Fig. 3 is a similar view to that in Fig. 2 but illustrating a further step in the process. Fig.
4 is a cross section on the dotted line X--X in Fig. 3.
As shown in Fig. 1, the different sections of pipe or tubing are substantially different in diameter, so that there will be considerable space between the inner surface of one section and the outer surface of the section introduced therein. The desired number of sections havin been determined, as the three illustrated 1n Fig. 1, the largest section 1 is suitably supported in a preferably vertical position, with its lower end closed, as by resting on a flat surface 2, it is filled with concrete or other lapidescent material 3 up to the point 4, usually from eigh teen inches to two feet from its top, as indicated in Fig. 2. The next smaller section of pipe 5 is then inserted within the empty upper part of the pipe 1, suitably supported in line with the latter and concentric therewith, its lower edge embedding itself more or less into the concrete below. This pipe 5 and the annular space between it and the pipe 1 is next filled with concrete; said annular space being topped with a conical water-shed 6 preferablyoverhanging the top edge of the pipe 1, as shown in Fig. 3. For such overhang 7, a suitable removable mold 9 is needed. The pipe section 5 being thus filled to within afoot or two from its top, athird section of tubing 10 is similarly introduced therein; the joint similarly provided with a water-shed, and
'itself lled with concrete. InY the same way,
any desired number of other sections may be added until the post is built upto the desired height. For trolley wires, the three sections illustrated are usually su'flicient, but for telegraph and electric light wires larger and more numerous sections are needed. For high electric light towers, four of these posts may be employed, but of course each being composed of larger and more numerous sections. It is evident that the sections of tubing may be of any desired shape, either circular as in Fig. 4, or oval, square, etc.
A post thus formed, being thus reinforced with concrete, cement or the like, is manifestly stronger and more rigid than a metal post of the same thickness of shell. Its joints are also much stronger than those threaded together, inasmuch as in the latter much of the width of metal is cut through by the screw-threads, while in the concreted joint, the joint is the strongest part of the post. The tensile strength is also great, an important feature where the posts are designed for towers; as it is a well known fact that a metal rod will itself tear apart before it can be pulled out from a mass of concrete within which it is embedded for a sufficient distance. Further, the inner surfaces of the tubular sections being all protected from oxidation by the concrete, while their outer surfaces are all accessible for painting, these posts can be kept from rusting for an indefinite length of time.
The former types of built-up metal posts being jointed directly one to the other section, were perfect conductors of electricity, but since in my post the sections are insulated one from the other by concrete, any current communicated to the topmost section cannot reach the lower ones. Hence my form of post will remove vthe danger of electrocuting people contacting with the same, and Will also reduce to practically zero any of the leakages of current too Small to be noticed. By having the watershed at the joints, and especially by the overhang thereof, any possible leakage of current during wet Weather is prevented.
In economy, these posts are striking, since there is no skilled labor expended in the construction, simply the Work of supporting the sections in position and filling them with the cement or concrete. This Work may be done either at a factory or on the ground Where they are to be used. Since pipe and tubing are only rolled about twenty feet in length, four sections are usually needed for a seventy-five foot pole.
For electric light poles, a central space is provided for the passage of the Wires; such space being produced by means of centrally located tubes of paper or the like, as shown at 12 in Fig. 4.
Vhat I claim as my invention and for which I desire Letters Patent is as follows, to Wit;-
1. A built up post comprising sections of metallic tubing of different diameters, a section of smaller diameter being inserted for a limited distance Within a section of larger diameter, and lapidescent material binding said sections together, said limited distance being sufticient to enable said united sections to effectively resist flexure and tension.
2. A built up post comprising sections of metallic tubing of dierent diameters, a section of smaller diameter being inserted for a limited distance Within a section of larger diameter, and lapidescent material filling said sections and binding the same together, said limited distance being suiiicient to enable said vunited' sections to effectively resist fleXure and tension.
3. A built up post comprising sections of metallic tubing of different diameters, a section of smaller diameter being inserted for a limited distance Within a section of larger diameter, and concrete filling said sections and the space between the smaller and larger sections, said limited distance being suiiicient to enable the concrete to resist any flexure and tension Which may be applied to the united sections.
In testimony that I claim the foregoing invention, I have hereunto set my hand this 8d day of November, 1910.
ARTHUR WV. FORD.
H. L. WHITTLESEY, BEATRICE M. MoRAsH.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.