US617062A - Insulating-arm - Google Patents

Description

No. M2062. Patented Jan. 3, |899. J. n. TALlAFEnRo.

INSULATIN` ARM.

(Application fled June 18, 1898.1

(No Model.)

Wa'n/esses l 70' rm: mms ams co. moromwo., msnmsvow u c UNITED STATES PATENT EEICE.

.IOHN D. TALIAFERRO, OF LOUDON, TENNESSEE.

INSULATING-ARIVI.

SPECIFICATION forming part of Letters Patent No. 617,062, dated January 3, 1899.

Application tiled June 18,1898. Serial No. 6.83,837. (No model.)

To (LZ/Z whom it may concern:

Be it knownthat I, JOHN D. TALIAEEREO, a citizen of the United States, residing at Loudon, in the county of Loudon and State of Tennessee, have invented certain new and useful Improvements in Insulating-Arms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine.

This invention relates to insulating-sup ports for electric conductors; and the object is 4to provide an improved construction of arm adapted for use on telegraph-poles or in other locations, which arm will not only be equipped with wire -holding insulators at suitable distances apart, but will also provide for insulation in the event of the Wires becoming` displaced from suoli insulation.

To this end the invention consists in certain novel features of construction and combinations of parts recited in the appended claims and preferred forms ot' embodiment of which are shown in the accompanying drawings, forming part of this specification.

Ot said drawings, Figure 1 represents a cross-arm constructed in accordance with my invention and applied to a telegraph-pole. Fig. 2 represents in longitudinal section, on an enlarged scale, that portion of the crossarm on one side of the pole, together with a portion of the pole. Figs. 3 and 4 are crosssections taken on lines III III and IV IV of Fig. 2. illustrating a modiiication.

In the accompanying drawings the reference-letter a designates a round metal rod which forms the core of the arin and which may occupya hole made transversely through the telegrapli-pole as shown in Fig. 2, or it may have a flattened central portion a', as shown in Fig. 5, bolted against one side of the pole, or it may be suited in some other way tor attachment to an appropriate support.

.Vhere the arm is for application to a telegraph-pole, it is made to extend on both sides of the same, and the rod is screw-threaded at each end, as shown at a2, to receive nuts b, for a purpose hereinafter explained.

Insulators are strung along the rod, and

Fig. 5 is a view similar to Fig. 1,

each insulator comprises a glass annulus c, circumferentially grooved, as shown at c', and beveled on each side of the grooves, and a bushing d, ot wood or other suitable mate rial, exteriorly screw threaded to engage screw-threads in the bore of the glass annu lus. These insulators are spaced apart and kept separate by means of glass sleeves e embracing the rod7 and similar sleeves c surn round the rod between the telegraph-pole an d the insulators nearest thereto. The nuts Z) applied to the ends of the rod bear against the outermost insulators and clamp all the insulators and sleeves together. The wires are engaged with the grooves ot the insulators and tie-wires are employed in the ordinary Way; but, as is well known, the tie-wires sometimes work loose and allow the electric conducting-wires to slip from their places. With my construction the arm is completely insulated and displacement of the wires cannot result disastrously, for the spacingsleeves c and c' are ot insulating material and will afford a bearing-surface for the wires in the event of their disengagement from the grooves ot the insulators.

The compactness and practicability ot the entire structure here shown will be noted and the fact that it is susceptible of ready adaptation to diilierent needs.

While I have mentioned glass as the material of which the spacingsleeves and grooved insulating-annuli are composed, it is to be understood that other insulating material may be used. Moreover, the invention may be embodied in structures differing more orless from those shown in the accompanying drawings without involving a departure from the spirit and scope of the invention.

The grooved insulators may be made with out wooden bushings, and the arm may be braced by a bracket-piece underneath if found preferable to making the center rod large enough to dispense with any such additionalV support.

In Ficb 5 washers of vulcanized rubber, are shown interposed between the sleeves and the insulators, and similar washers may be introduced between the post and sleeves, and one may well be interposed between the clampingnnnt and the end insulator, especially where the latter has no wooden bush-V ing. rlhe short sleeves fo (shown in Fig. 5) between the innermost insulators and the ilattened portion of t-he rod may be advantageouslymade of vulcanized rubber the same as the washers a'.

Having thus fully described my invention, what I Claim as new, and desire to secure by Letters Patent of the United States, is-

l. An insulating-arm eornprisinga horizontal supporting rod or eore of metal, annular insulators strung upon the saine and having encircling wire holding grooves, spacingsleeves of insulating material surrounding the rod between said annular insulators, and means for holding latter and the sleeves together on the rod.

2. An insulating-arm comprising a metal supporting rod or eore, annular insulators strung upon said rod and having wooden bushings, and spacing-sleeves of insulating material covering the rod between said annular insulators.

3. An insulating cross-arm for telegraphpoles, comprising a metal rod for engagement with the pole, sleeves of insulating material strung along said rod, annular insulators applied to the latter between the sleeves, and means for Clam ping the sleeves and insulators together on each side of the pole.

Ll. The combination of a pole having a transverse opening through it, a metal rod passing through said opening and having screwthreads at its ends, insulators strung upon said rod, spacing-sleeves of insulating material covering the rod between the insulators and between the innermost ones of the latter and the pole, and nuts applied to the ends of the rod and clamping the sleeves and insulators together.

In testimony whereof I aiiix my signature in presence of two witnesses.

IOIIN D. TALIAFERRO.

Titnesses S. H. HENDERSON, A. S. HENDERSON.

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