US905414A - Metallic insulator-pin. - Google Patents

Description

0. G. ETTE.

METALLIG INSULATOB. PIN.

APPLIGATIOH Hmm 11110124, 1907.

905 ,414. Patented Dec. 1, 1908.

iyi

mn'm'/l UNITED STATES PATENT OFFICE.

CHARLES G. ETTE, OF ST. LOUIS, MISSOURI, ASSIGN OR TO ETTE INVESTMENT COMPANY, OF ST. LOUIS', MISSOURJ., A CORPORATION OF MISSO-URI.

-HETAILIC INSULATOMIN.

Specification of Letters Pabent.

Patented Dec. l, 1908.

To all 'whom fit may concem:

Be it known that I, CHARLES G. Errn, a Citizen of the United States, residin'g at St. Louis, Missouri, have invented ia certain new and useful Improvement in Metallic Insulator-Pins, of which the following is a full,`

clear, and exact description, such-as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation of an insulator pin constructed in accordance with my invention, said figure also showing in Section.

an insulator mounted on said pin; Fig. 2 is a side elevation of said pin taken at right angles to Fig 1; Fig; 3 is a longitudinal sectional view of the pin; Figz'll is an enlarged cross sectional view taken on the line 4 4 of Fig. 2;Fig.- 5 is a cross sectional view taken on the line 5 5 of Fig. 2; F ig. 6 is a cross sectional view takenon the line 6 6 of Fig;

i 3; and F ig."7 is a cross sectional view of a oneiece pin.

'T 's `invention relates to insulator pins; nanely, devices that are employed for supporting insulators such as are generally used n connection with electric wiring.

The main object of my invention isto provide'a metallicinsulator pin which is so constructed that the expansion of the metal from which the in is formed will not cause the insulator to break.

other object of my invention is to provide a metallc insulator pin having means of novel Construction for preventing the pin from turning or pulling out of the support in which itv s mounted. And still another object of my' invention is to provide a me- 'tallic insulator pin comprising a plurality of longitudinally extending slot l-is formed in' the screw-threaded portion of the pin so as to'produce two separate parts that can move nwardly orV toward each other when the metal in thepin expands and thus prevent breakage of the insulator which is usually formed of some fragile material such, for example, as glass or porcelain. The slot 1 in the pin provides for theexpansion of the pin in one direction, namely, in the direction indicated by the arrows a in Fig. 4, and' 'to provide for the exp'ansi'on of the pin in the opposite direction, as indicated by the arrows in said figure, form the screw threads 2 on the pin oval instead of round so that the coperating screw threads on the interior of the insulator will .bear closelyV on the threads of the pin at onlytwo points instead of completely around the pin. In V other words, I provide the pin with screwthreads of such shape that the insulator bea-rs snugly on only two sides of the pin and provide the pin with one ormone lon tudinally extending slots that permit t e portions of the pin which are 'snugly embraced by the insulator to move inwardly or toward each other when the metal in the pin expands.

o he pin is rovided at its lowe` end with a plurality of separated ribs havingtranfsversely extending serrations or teeth 3 'so that when the pn is driven into a. support C theseteeth or serrations will bite into the supportl and thus prevent the pin from drawing out or becoming; accidentall V displaced. By separating the' serrate' ribs from each' other I produce longitudinall)7 extending channels 4 which are filled by portions 4' of the support when the pin is in operative position, as shownin Fig. 5, so that itwill be impossible for the pin to rotate or turn in the support. This is a very desirable feature of an insulatorpin for during theoperation of applyingv the'insulator or removing it ,from the` pn, the in is Vsubjected to great torsional strainlwhch" tendsto make it turn or rotate in the support. I' prefer to form the serrated or toothed ribs 3 slightly tapered, as shown in Fig. 1, so as to prevent the pin from being driven too far nto the support. The pin" is hollowiandlis preferably formed in two sections 5 and 6 that' are provi' ed on their ,longitudinal edges with inter] king teeth Iwhich extend throughout the entireV lengthof the. unscrew-threaded portion of the pin, the longitudinal edges of said sections being spaced away from eachother lat the upper; end. of the pin to form the slots 1. The pin is formed of cast metaland the main .advantage of forming it in sections'is the low cost of manufacture.

The section 6 of the pin isprovided onits.

.one end with a plurality o interior with lugs 7 as shown in Figs. 3 and 6, which are 'embraced by'thel section 5 of the pins When said sections are placed ether, said lugs preventing one Section rom being moved transversely relatively to the other section'when'the sections are placed together preparatory to inserting the pin in the opening in the support C.v I also prefer to form'an opening 8 in the lower end of the pin, as shown in F ig. 3, so a s to prevent Water from collectin in the pin.

While I prefer to %orm the pinin sections, as previously described, it will, of course, be

understood that so far, as the screw-threaded portion and the serrated portion of the pin are concerned, it is immaterial whether the pin is formed in one 7 or in two sections, as shown 'in the other tigures of the drawing, for the two sections of the pin are placed together before the pin is inserted.

l-laving thus described my invention, what I claim as new and desire to s'ecnre by Letters Patent is:

1. A metallic insulator pin provided at one end With a longitudinally extending slot Which provides for the expansion of the pin in one direction, and screw-threads of approximately oval shape that are adapted to coperate With screW-'threads of substantially circular shape on an insulator and thus provide for the expanson of the pin inthe opposite direction; substantially as described.

2. A metallic insulator in provided at fpseparated parts which provide for' the expans'ion of the pin in one direction, and screw-threads of approximately oval shape that are adapted to coperate with screw-threads of substantiallly circular shape on an insulator and thns provide for the eXpans'ion-of the pin in the opposite direction; substantially as described.

3. A metallic insulator pin provided. at

piece, as shown in Fig.

one end with a pluralityof longitudinally extending slots which provide forthe expansion of the pin in one direction, and screw-threads of approximately oval shape that are adapted to coperate with screwthreads of substantially circular shape on an insulator and thus provide for the eX- pansion of the pin in the opposite direction; substantially as described.

4. A hollow insulator pin formed of metal and having a slot which providesforthe expansion of the pin in one' direction, and screw-threads of approximately oval shape that are adapted to coperate withscrewthreads of snbstantially circular shape on an insulatorvand thus provide for the expansion of the pin in the opposite direction; substantially as described. 1

5.. A cast metal insulator pin consisting of a plurality of sections that are provided on their longitudinal edges with interlocking teeth, and means independent of said teeth for preventing one Section from being moyed transversely of the other Section when they, are placed together; substantially as described.

6. A metal 'insulator pin .comprising a. plurality of sections provided on their longitndinal edges with interlocking teeth, and lugs on one seetion which are embraced by the other Section when said sections are placed together; substantially as described.

7. A hollow insulator pin formed of metal and consisting of two semi -cylindriealshaped sections that are providedl on their longitudinal edges with interlocking teeth; substantially as described. f

In testimony'whercof I hereunto affix my Signature in the presence of two witnesses, this nineteenth day of December 1907.'

CHARLES G. ETTE,

Witnesses:

EDJWARD SCHWIDDE, BERNARD J. BURRICHTER.

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