US1196272A - Insulator-pin. - Google Patents

Description

C. L. PEIRCE, In.

INSULATOR PI'N.

APPLICATION FILED 050.18. 1912.

Patented Aug. 29,1916.

ED STATES PATENT OFFICE. if

' CHABLES'L. PEIRCE, JR... or PITTSBURGH, PENNSYLVANIA, ASSIGNOR OF-ONEHALF 'ro' HUBBARD sYLvAivm.

& CO., OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN- msnm'ronrrm.

Specification of Letters Patent. P t t 29 19 Application filed December 18, 1912. Serial No. 737,367.

- To'allwhom it mgayeconcem: I Be it known that I, C ARLES L. PIERCE, J n, --a citizen of the United States, residing in Pittsburgh, county'of Allegheny, andState of Pennsylvania, have invented certain new and useful Improvementsin Insulator- Pins, of which the following is a specification.

My invention relates to improvements in insulator pins, 7 and ivmore particularly to 10 pins for "carrying high-tension wires, and

which are necessarily of considerable height and subjected to severe stresses.

-While the principal object of my invention is to construct an 'insula'tor pin that will not break or bend under severe strains, and-which'will provide a rigid and durable structure, I furthermore seek to provide a pin fromv which an insulator may be read-- I ily'. removed, and one"embodying a structure 1116 parts of which are of minimum weight,

are readily set up, which may be packed ,for shipin'ent in a small space;

Still, a further-object of the invention is to provide a pin'with a-remoya'ble base, so

.25 that the same pin maybe used witlrbases of various required'shapes. Further advantages of the invention will be more specificallyreferred to inthed'e- 'scription and set forth in thedrawings, in which- V Figure 1 is an elevational view of my improved sectional pin with a part broken 'away and other parts in section; Fig. 2 is a detail sectional-view of theltop portion of .a modifiedform of pin. Fig, 3 is an elevational view'of what I term my single sectional pin with parts broken away and other parts in section. -Fig. 4 is a detailsectional view of the to'p portion of a fur- 40 flier-modified form of pin. l

Referring-now more particularly to the .drawing, a suitable bolt 4 having a threaded lower end 5 to which a nut 6 is applied, and a head orathreaded or corrugated up- 15 per end 7 constitutes the main means for securing'the pin to its support and the insulator to the pin. The insulator pin consists, in part, of a metallic shell or truss 8 which is shown in Fig. 3 as consisting of a single piece of sheet metal, which may be either 'drawn'or rolled into cone form or any other suitable shape so as to form a truss, and the upper smaller end of which is provided with threads or corrugations 9.

In the preferred form, the bolt is separably attached to the'shell to facilitate packing in a small. space for shipment, and to allow the. using of bolts of various lengths with the same shell-whenreqnired by supports of various thicknesses, but it may be welded or otherwise permanently attached thereto.

Obviously an insulator might be cemented or otherwise secured directly to the shell 8 at its corrugated end, and ample strength would be provided in the construction herein described so far,- but it is advisable to quake provision for quickly removing and replacing the nsulator in case of electrical orother injury thereto, and to provide for such removal and replacement separable thimbles adap'tedto hecemented into the insulator and to be screwed to the pin are advisable. Present types of pins having this sep;.rable thimble. feature are. weak atfthe trnss or shell, as either thetr'uss only or the securing bolt onl v extends into thethimble.

7 joint between the thimble and the-main Frequent breakages occur -at this.poi'r'it.- In

my structure, it. will be noticed that both the securing bolt and the shell extend into thethimble and the joint is thereby. reinforced. Because of the limited dimensions imposed .by general insulator design, this -feature is obtainable only by the use of a thimble with thin walls. I provide a thin walled thimble, and at the same time a thimble of the requisite strength-andductility by drawing the same. up from flat sheet metal and rolling corrugations therein which provide internal securing threads and corresponding exterior cement-retaining grooves.-

As insulatorpins are largely used. on

wood supports, it is desirable that a broadhase be provided upon which the shell 5 may rest. Itis also desirable to reinforce the lower edge of the shell 8 against spreading under severe strains, and also to retain the bolt 4 in the center of the shell to secure the'full benefit of the trussconstruct-ion. As the wood supports upon which insulator pins are used aremade both with fiat and convex upper surfaces and of various widths according to the character of the construction, it is essential that insulator pins befurnished with various forms and sizes of bases. To obviate the necessity of 'gral connectin carrying stocks of complete pins of each de sired form, I provide a removable base so that by carrying extra bases only the pins may be assembled to fit the desired support. A further important object of the removable base is to facilitate the packing of all the parts of these pins in a minimum of space. A large number of bolts may be packed in one case without waste space. A large number of shells may be nested one within the other into a small space and the bases will likewise pack closelytogether; allowing the packing of a dozen pins of my design within the space required for three or four pins of usual present types. This feature is of immense importance because of these insulator pins being largely used in unsettled country where transportation is a. difiicult problem. To this end, therefore, I make the base 13 separate from the shell 8, and pro vide the same with a retaining annular groove 30, formed by the corrugations 14 and 29, in which groove the lower end of the shell 8 rests. The inner corrugation 14 is higher than the outer corrugation 29 to prevent water seeping into the interior of the shell and running down the bolt hole 17 in the support'lfi thereby tending to decay and otherwise injure, the support: In Fig. 1 the base 13 is'shown adapted for a support with flat top; In Fig. 3 the base 13 shown is for a support with a convex lt is obvious that when desirable, intemeans between the lower end ofithe shel 8 and the base 13 may be provided. I

The securing of the'shell to its support will. be readily understood by merely stat ng that when the parts are assembled, by turn ing upon the nut 6, the upper end of the bolt will. be drawn toward the support, thus firmly and rigidly locking the shell upon the base 13.

The sizes of insulators vary according to the voltage for which thy are designed. In-

sulator pins are therefore also made in various sizes. In Fig. 1, I show a sectional structure whereby pins of various lengths may hc assembled by using 1, 2 or 3 shell units. It is obvious thatwith this structure, a smaller investment in stock will serve to meet the possible demands for pins of different lengths thanwould be required if a stock of complete pins of each size had to be carried. I Yet in this structure none of the essential. features of strength, lightness, and facility of packing are lost. In this structure, Fig. 1, the top section 19 is provided with a threaded or corrugated interior for attachment to the bolt 4, while themiddle section 20 and the lower section 21 are each slightly reduced in diameter at their closed upper ends, forming annular shoulders 22 and 23 upon which the lower edges of the construction, which I deem within the scope of my invention, wherein the bolt 4 is provided with an enlarged threaded or corrugated end 24, the lower edge of which forms a shoulder 25 that engages the upper edge of the shell 8. \Vhere a bolt of this construction'is employed the upper end of the shell 8 is open and the parts are so proportioned that the shoulder 25 rests upon the upper edge of the smaller end of shell 8 and thus when the bolt is drawn by-the nut 6 the shell will be forced against the base plate 13. In I this modified form the thimble .26 is pro vided with suflicient threads or corrugations 27 so as to engage the threads or corrugations on the end 24 and the skirt 28 is made somewhat longer than the skirt 12 in order to provide a greater bearing surface to re sist the strain. 7 V

In Fig. 4 the bolt 4 is the same-as shown in Fig. 2 with the corrugations onth'e end of the bolt omitted. Corrugations or threads 31 are formedon the shell 8 and complementary corrugations or threads 32 are formed on the lower end'of the skirt 28 and the two parts may be secured, together. by either screwing or cementing- It is obvious that there are many other ways of securing the shell to the bolt, and, therefore, without confining myself to the particular details of construction herein shown,-

I claim:

1. An insulator supporting pin structure comprising a metal truss. a bolt extending throu h the truss and threaded at its upper end, t e upper end 'of the truss cooperating with the threaded end of the bolt to lock the bolt against downward movement in the truss, and an insulator supporting thimble surrounding the threaded section of'the bolt and the upper end of the truss.

2. An nsulator supporting pin structure comprising a hollow truss adapted to rest on a support, a bolt extending through the truss receiving the upper end of the bolt and the truss, said bolt having interlockingengagement with said truss to be held against downward movement therein independently of said thimble, said thimble when ap lied intimately surrounding said interloc ing connection.

l. uptwflln pin strmiww- 121 tmt a bolt, and A, ug fin; upper and of w i 50% having interlocking upper cud of the truss inst dcmm'nrd wow 1,! the thimble, said

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