US1043916A - Insulator. - Google Patents

Description

P. M. FARWELL.

IIIIIIII R.

1,043,9 1 6, Patented Nov. 12, 1912.

Y lllllll/ 1 UNITED srarirsjmraur OFFICE.

rami: M. FABWELL, or KANSAS criar, Missouri.

INSULATOB.

Specification of Letters Patent. i Patented Nov. '12,1912' f Application lied October 17, 1911. Serial No. 655,198.

T o all whom it lmay concern:

Be it known that I, FRANK M. FARWELL,

a citizen of the United States, residing at Kansas Cit-y, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Insulators, of which the following is a specification.

This invention relates to insulators of that class for use with outside telegraph andv reference is to be had to the accompanying drawing, in which- Figure 1, is a top plan view of the lower portion or base'vof an insulator embodying myinvention. 'Fig 2, is a central vertical section of the complete insulator taken on `the line II-II of Fig. 1, with a wire clamped in operative position. Fig. 3, is a side view of the Alower portion or base of theinsulator. Fig. 4, is a vertical section on the line IV-IV of Fig. 1'.

In the said drawing, 1 is a porcelain or analogous base provided with. an opening 2, and a communicating threaded bore 3, to respectively receive and en age the lower and upper or threaded portions of the customary pin, not shown, of the cross arm of a telegraph or telephone pole. The lower part 4 of the base is of substantially conical form and the upper part 5 also tapers upward slightly, and at the upper end is provided with a diametric slot or bifurcation 6, which is contracted in width at opposite sides of its center, as shown clearly in Fig. 1, the parts 7 of the upper portion 5 which form the sides of the contracted porl tions of the slot or bifurcation, being roundfor the purpose of tending to centralize a telegraph or telephone wire, 12 in the slot or bifurcation, and the slotted or bifurcated portion of the base is externally screw threaded as at 13. 1

14 is a cap of porcelain or analogous material which is internally threaded at 15 to engage the threads 13 of the base, and said cap is provided between its outer margins and sai threads and at ,the lower end of the latter, with a flange 16, which depends below the -outer margin of thev cap and is of rounded form in cross section as shown in Fig. 2, the said Bange when the cap is screwed its full distance on the base, l ing in a plane above that of the lower en s of the tapered surfaces 9 and said flange is of substantially greater diameter than the npper portion of the base so as to occupy a plane outward of said ortion of the base.

To secure a wire r iably in position by means of this insulator, the former is first slipped down into the slot or bifurcation 6 until it rests upon the boss 10. The cap is then screwed upon the upper end of the base until the flange 16 engages the wire. The

latter is then preferably bent downwardly upon the boss by any suitable means to substantially the position shown in Fig. 2, and then the cap is screwed downward until such movement is arrested by engagement with the upper extremity 'of the base, as by bending the wire in the manner explained and then screwing the cap down the former is notsubjected to a grinding or cutting action incidenty to the cap being pressed upon it and turned at the same time, though of course the bending of the wirefas explained may be accomplished by simply screwing the cap down and causing it to bend the wire as explained.

When the wire and cap occupy the position shown in Fig. 2, the former, it will be observed, is in contact with the insulator at three points only, namely, with the boss and withl the annular depending flange 16 at diametrically opposite sides of the boss.

With the parts thus arranged it will bev is provided with the daring mouths hereinbefore referred to, as without such Haring mouths the wire in such swaying movements would bev subject to abrasion by contact with comparatively sharp portions of the base.

In Fig. l the Wire is shown in dotted lines in a position to which it may sway in gusty weather. It will be observed by reference to Fig. 2, particularly, that the portion of the cap outward of the depending Harige 16, constitutes in effect a skirt 17 which shields the depending flange 16 and the wire at the points of contact With-said flange from the rain, snow and hail.

From the above description it will be apparent that I have produced an insulator embodying the features of advantage enumerated as desirable and I wish it to' be understood that while I have illustrated and described the preferred embodiment of the invention I do not desire to be restricted to the exact details of construction shown and described as obvious modications will suggest themselves to one 4skilled in the art.

1. An insulator comprising a base provided with a diametric bifurcation in its upper end and tapering upward from opposite sides at the bottom of said bifurcation and provided at the apex of said tapering surfaces with an upstandingr rounded boss; the slotted or bifurcated portion of the base being externally threaded,in combination with an internally threaded cap to receive the threaded slotted or bifurcated portion, and provided in a vertical plane between the threads and outer margins of the cap'with a depending rounded ange of greater diameter than the base at the bottom of said slot or bifurcation; the parts being so proportioned that the said flange shall occupy a horizontal plane above the lower ends of said tapered surfaces of the base.

2. In an insulator, a base provided with a diametric slot or bifurcation in its upper end and tapered upwardly from opposite sides at the bottom of said bifurcation and provided at the apex of said tapered surfaces with an upstanding rounded boss; the slotted or bifurcated portion being externally threaded.

3. In an insulator, a base having( in its upper end a diametric slot or bifurcation of greatest width at its center, the base at the bottom of the slot or bifurcation extending upward from opposite ends of the latter and formed at the apex of said surface and at the widest point of the slot or bifurcation with Aan upstandng rounded boss; the slotted or bifurcated portion of the boss being externally screw-threaded.

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

FRANK M. FARWELL.

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