US1806170A - Bracket and dead-end insulator - Google Patents

Description

y 19, 1- s. w. LAW ETAL 1,806,170

BRACKET AND DEAD END INSULATOR Filed Aug. 22, 1927 gwvcntov 6 700%??? Za/W Wz'ZZmJEame Patented May 19, 1931 UNITED STATES PATENT :oFrlcE:

STANLEY W. LAW, OF MAI-ITOMEDI, AND WILLIAM J. 'EAMES, ST. PAUL, MINNE SOTA i BRACKET AND DEAD-END IN'S'U'LA'LOZR,

Application filed August 22, 1927. Serial No. 214,496. I

This invention relates to an insulator and bracket, particularly, although not exclusively, adapted for dead ending signal and telegraph wires.

It is our object to provide a novel, inexpensive and unusually eflicient insulator and supporting bracket of this class. The invention also includes certain novel features of construction which will be more fully pointed out in the following specification and claims.

Referring to the drawings, Figure 1 is a plan view of our improved insulator and bracket in the form adapted to support a double dead end; Fig. 2 is a side elevation of the same; Fig. 3 is an enlarged plan view of one of the bracket arms, one end being broken away; Fig. 4 is a side view of the same; Fig. 5 is a plan view of one of the insulators, separated from the bracket; Figs.

6 and 7 show modificationsof the device,

adapted to serve as single dead end insulators and Figs. 8 and 9 are plan and side views respectively of a suitable lock washer for the bracket bolts.

As illustrated, our device is primarily adapted to be secured to a cross arm 11 of the common or standard type in use upon signal and telegraph poles. A pair of bracket members 12 are arranged to be secured to 3 the supporting arm 11 by a pair of bolts 13. One of these bolts 13 is placed on each side of the arm 11 and extends through a perforation 14 in the bracket member 12. At each end of the bracket member 14 (shown in Figs. 1 to 4) an arm'15 projects and is formed with a ring 16 at its extremity. These rings are arranged in pairs and in spaced parallel relation to receive hubs or projections 17, which are formed integral with the insulator 18. Each insulator 18 has a projection 17 at each end and the wires to be supported and insulated are secured to the central or waist portions thereof between the supporting arms 15. Above and below the central portion of the insulator, annular flanges 19 are formed to project outward and downward. Thus, the flanges 17 form dry zones or areas 20 to protect against short circuits when the insulator is wet. An axial opening 21 extends longitudinally through the insulator. This axial opening is adapted to receive a bolt for suspendingother insulatorbrackets .if desired in a particular location or otherwise toreceive a supporting bolt. Theinsulators 18 are preferably formed from glazed porcelain. The bolts 13 are preferably of the carriage bolt type having square portions 15 fitting squareopenings 14 inthemembers 12 and providedwith nuts 22v on their threaded ends. These nuts may be locked in place by means of lock washers-23, each having a' fiange 24 at one edge, adapted to engage one of the members 12 and apair of ears 25 on the op-' posite edge, adapted to be bent'into engage, ment with the nut 22. As shown in- Fig. 6, the bracket for securing the insulator to the arm 11, may be formed from a single band of'metal 2 6 of U shape, secured in place by a single bolt 27 andhaving projecting arms for supporting the insulator, similar to the arms15. Otherwise, for use ,where a single insulator is required, one pair of the arms 15 may beomitted, as shown in Fig. 7.

,As will now be readily understood, the wires tobe insulated and supported are secured around the central portions ofthe in-; sulators 1;8, which are held at their upper and lower ends by-rings 1.6 encircling the projections 17. Obviously, by merelyloosening the nuts 22 on the bolts .13, the arms 13 maybe separated suflicientlyto permit insertion of theprojections- 17 into the rings 16. Thus, the operation of replacing insulatorsmay be accomplished quickly and easily. The wires are efficiently protected against short circuits by reason of the dry areas 20, both above and below the central part of theinsulator and between the same" and the supportingarms 15. By reason of the absence of. any conducting material ex tending through the insulator, the protec-j tion. is reatly increased. Thus,;ifjan insulator is roken, the supported wires are freed but not allowed to make contact with the brackets. If the insulator is broken to such an extent that the attached wires are dropped, the fact canbe readily detected and the necessary repair effected. By making the brackets from bracket members which are interchangeable or identical, the cost of the device is minimized and the work of installing and repairing the same is facilitated.

It will be evident that the flanges 19 forming the annular dry areas 20 greatly increase the efficiency of the device as compared with the common'type of spoolinsulator. I

Having described our invention what we claim as new and desire to protect by Letters 10 Patentis: p p 1. In an insulator of the class described, the combination with a bracket adapted to be secured to a support, a pair of rigid arms projecting from said bracket, portions of said arms disposed in spaced relation, means on said portions forengaging an insulator between them and an insulator formed to be supported at itsends by'saidengaging means and topositively interlock therewith, whereyfb by separation of the arms and insulator is prevented without breakage when'in use, said arrnsbeing without a connecting member exten-ding throughsaid insulator.

2. In an insulator of the classdescribed, 7 2B the combination with a bracket adapted to be secured to a support, a pair of rigid arms projecting from said bracket, portions of I saidfarms disposed in spaced relation and V having openings therein to support an insu- 313 lator, an insulator provided with projections on its ends, adapted to positively interlock with said openings to prevent separation of the insulator and arms without" breakage when in use and a protective flange on said 3'5*-insulator, adjacent to the inner side of each of said arms.

3. Inan insulator of the class described, the combination with a bracket formed from I two substantially parallel'and identical mem-' 4o bers adapted tobe secured to opposite sides of a support, a pair of bolts'connecting saidmembers adjacent to opposite sides of said support, and a rigid a'r'm' projecting from g each of said bracket members, the extremwines of said arms bingfdisposed in spaced, parallel relation, one above the other, and having openings to support an insulator, an: insulator formed with cylindrical projec-v t'ions on'its'npper and lower ends, adapted I y 50" to positively interlock with said openings,

said insulator'liaving a centralportion arranged for attachment to a wire and protective flanges on said insulator between said 7 arms and central portion, said flanges ex 55" tending'downwardto form annular dry areas between said arms-"and central portion of the insulator. n v In testimony whereof, we have hereunto signed ournames to thisspecification. STANLEY W. LAW.-

WILLIAM-: J EAMES.

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