US2024831A - Insulator - Google Patents

Description

E. M. MEYER INSULATOR Filed June 2, 1935 2 Sheets-Sheet l E. M; RVJEYER Deco 317 1935a INSULATOR Patented Dec. 17, 1935 IN SULATOR Edwin M. Meyer, Parkersburg, W. Va., assignor to Porcelain Products, Inc., Findlay, Ohio Application June 2, 1933, Serial No. 674,093

6 Claims.

The invention to which this description relates consists in electrical insulators of the type in which a spool or knob of porcelain or other insulating material is held rigidly in place by a holder which is in the form of a screw-eye, bolt or the like. Such devices are used to hold the running part or an end of a wire conductor insulated or not. Under circumstances where this conductor is at the so-called dead end of a length there is considerable strain imposed upon the device due to the.weight of the conductor and the tension with which it is fastened.

Insulators of this type are usually fastened to cross-arms, posts, walls or the like by means of position of the screw-eye.

wood screw-threads forming part of the device or a screw-threaded bolt and a cooperating nut.

Due to the tension imposed upon such an insulator there is a marked tendency for the loop of the screw-eye to open under the tension to the point where the porcelain spool itself may drop out of the loop. One of the objects of my invention is to provide means for preventing the loop from opening under any operating condition. By the use of my design it has been found that the fixture will sustain several times the normal amount of tension required to open up the loops of ordinary screw-eyes and in fact permits me to utilize the maximum strength of the porcelain spool which will itself break before the screweye fails.

Another object of my invention is to provide the improved means by which the ends of the loops of the screw-eye are held together without v possibility of disengagement. 35

It is an object of my invention to provide greater stability, increased mechanical strength and resistance to a pull at right angles to the axis of the screw by the use of an extended metal base. This base is a special form of the holding means for the ends of the loops of the screw-eye and combines the holding means with a base plate. In this way the base plate may be nailed into its final position on the support to prevent rotation and thus determine the angular This will prevent the latter from working loose from the support. At the same time added reinforcement against lateral stresses in all directions is insured.

A further object of my invention is to utilize a large portion of the circular extent of the loop of the screw-eye as a bearing surface for the porcelain spool and convert the tension to a large extent into a pull or force longitudinally of the rod of which the screw-eye is formed. In other words, the ends of the loop of the screweye are given directions tangential to the generally circular form of the bearing groove of the porcelain spool and thus minimize lateral stress on the material of the screw-eye.

Among the objects of my invention is the establishment of contact between the porcelain spool and the screw-eye so that there can be no relative rotation and thus there is avoided any possibility of the spool being turned during use under the influence of wind, swaying trees or the like which might otherwise cause objectionable creaking noise or wear.

The above and other objects of my invention will be apparent from the following description of the preferred embodiment of the invention as illustrated on the accompanying drawings in which Fig. l is a side elevation of the screw-eye insulator;

Fig. 2 is an end elevation of the same, partly in section;

Fig. 3 is a perspective view of the fastening and holding link;

Fig. 4 is a longitudinal section of a modified form of the invention;

Fig. 5 is a side elevation of the invention applied with an extended base-plate;

Fig. 6 is an end elevation thereof;

Fig. 7 is a top view thereof and Fig. 8 is a perspective view of the improved form of base.

By way of illustrating the invention and showing one of the forms which it may take, I have shown in the drawings a porcelain spool 5. This spool is made of glazed porcelain and given a form in which there is a flaring axial passageway 6 through which the service wire may be strung. Passageway 6 is flared at both ends as indicated in dotted lines in Fig. 2 so that the Wire may be passed through and back upon itself to form a loop extending in any direction from the spool and without subjecting the wire to sharp edges which might cause wear or the destruction of insulation.

The mid-portion l of the spool is in the form of a groove which in Figs. 1 and 2 is illustrated as a true circle extending peripherally around the opening of the passageway 5 and equidistant therefrom. On each side of the groove 7 are end flanges 8, 8. These flanges may be of any convenient form although for purposes of improved electrical insulation they have been shown in Fig. 2 as having two spaced heads 9, 9.

One of the end flanges 8, 8 is split or transversely notched to form a recess Ill. While this out a relatively large circular area andis transmitted by the angular ends i l and 1 5- directly open ends 11, ll.

'shank 52 while the opposite end i5 is brought back adjacent and parallel to the shank. The middle portion of the loop 53 is circular and conforms in final position with the middle portion I of the spool 5. The end portions 14 and is in meeting form substantially a right angle so that the pull on these ends is tangential tothe circular parts of the loop. and spool and practically axially of these looped portions.

A link I6 is formed of metal and has opposite ends H which are bent inwardly as shown in Fig. 3. The link it? is applied to the. ends of the loop in its position around the spool 5 and thus holds these loop ends firmly in contact against separation.

As illustrated in Figs. 2 and 3 the link It is provided with aing it at the sideopposite-the The lug 18 has a lateral extension l.9 which conforms in position and extent to the recess iii in the spool 5-. When the link It isapplied tothe screw-eye, the detent i9 is within the recess [9- and thus prevents relative rotation of the screw-eye and spool.

In order to'prevent accidental removal of the link I6 or the disengagement of detent Hi from the recess Hi I have shown the free end of the loopto be bent laterally to'form the-end- 20-.

In the modification shown in Fig. 4* the spool 5 has the opening ti and the end flanges 8 as already described. The middle portion is circular for substantially three-fourths of its periphcry but the remainder is formed with an enlargement 2i which isboundedby intersecting faces substantially tangential to the inner wall of the: groove 7.

This enlargement conforms quiteclosely with the axial relation between the ends 14 and I5 of loop l3. against accidental separation.

The insulator is assembled in any convenient manner with.the link it; holding the ends of the integral loop together; Either by: reason of detent l'l or enlargement 2+ the spool is prevented from relative rotation. The link- "5- is prevented from sliding'movement by the lateral bend 20..

The tension on the loop is applied throughand evenly to shank l2. In this manner the screw-eye will hold without deformation uptothe full extent of the compression which the porcelain spool will sustain without fracture.

. The porcelain spool is prevented from rotating in the screw-eye by the design thus described.

The form of the device as illustrated in Fig. 4- is capable of further development in respect to the link I6. Figs. 5 to 8 inclusive where the link I6 becomes a split collar 2|. This collar is ovalin crosssection as shown in Fig; 8 and one end of the ovalis split to form the open ends 11, IT. The ends H are sufficiently short in extent so, that during assembly they may be swaged' or bent inwardly so that they meet and provide a close fit around the ends M and I5 of the loop of Link I6 holdsthe ends ofthe loop' This has been illustrated in the screw-eye 13. The extent of movement and the flt is illustrated in Fig. 5. In like manner it will be evident that the height of the ends H, I? is sufiicient to extend substantially for the full distance between the outwardly turned end 26 and the bends in the loop ends l4 and I5.

The oval collar 2| forms the upstanding central part of a circular base-plate .22. This base-plate is made of sheet metal stamped or otherwise formed into final shape. portion of this. plate is dished or flared over the greater part of its circumference to form sloping shoulders 23which merge in the base and the collar 2|.

The central 1o The remaining portion of the base is rela- 15 tively flat? and has an upstanding flange 24 which. completes the oval of the original form of the collar 2|. This flange is sufiiciently deep approximately to extend over the width of the end. 20; 20

The flange 24 is separated from. the ends I], I? by an openslot 25. The width of the slot is in a sense dependent upon the height of the' flange and is essentialonly to insure that the flange be large enough to prevent turningrof'zg. the end 28 and also to permit: the ends IT, IT

to clear' the upper edge of'the end 20 in their closing movement.

This .form of the". invention is assembled as already indicated with the shank ll andiend 201dbeing inserted from above into the oval opening ofthe collar 2|- until. the end 2011s beneath the ends H; I? and opposite. the flange 2 The ends I1; I"! are bent inwardly to meet tightly around the ends f4; and 15' of] the loop. 35,;

and thus prevent the latter from movement. lengthwise.

The insulator is usedlinl theusuali manner by drawing up the screw end I2 into the support untili contacted by the base-plate; 22.. driven into the. notch 26' of the plate. will prevent further angular movement. of the plate. and. insulator. Thescrew-eye and" insulator are: held in final. position without. the possibility of working loose. accidentally or changing. their-45.

angular position.

While the. preferred. form of my inventionihas.

been described and.- illustrated for. purposes of illustration, still. any changes in. details and;

vention as defined in the following; claims.

What I claim is: 1. An insulator comprising: a spool having: an axial wire-receiving passageway and parallelLend;

flanges, one of. saidflanges. having a. recess; a

holding member around; the spool, and a; detent. carried by the holding member and. engaging. within saidrecess.

2'. An insulator comprising: a spool having:

axial wire-receiving passageway and parallelend flanges, one: of said flanges having a recess, a 75 A naill 40..

' parts may be made within the scope of them -50,

axial wire-receiving. passageway and. parallelr'e'nd: g

screw-eye having a loop around the spool, the ends of said loop meeting at a point eccentric to said loop proper, means carried by the meeting ends of the loop for fastening them together, and a detent on said fastening means for engaging said recess.

5. An insulator comprising a spool having an axial wire-receiving passageway and parallel end flanges, one of said flanges having a recess, a

10 screw-eye having a loop around the spool, a link around the ends of the loop and a detent on the link for engaging said recess.

6. An insulator comprising a spool having an axial wire-receiving passageway and parallel end flanges, one of said flanges having a recess, a screw-eye having a loop around the spool, a link around the ends of the loop, one end of the loop being bent laterally adjacent the link, and a detent on the link for engaging said recess.

EDWIN M. MEYER.

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