US1690392A - Insulator pin - Google Patents

Description

A. O. AUSTIN INSULATOR PIN Nov. 6; 1928.

Original Filed May 12, 1920 Wit,

04 44 M jigs;

Patented Nov. 6, 1928.

ARTHUR O. AUSTIN, OF BARBERTOH, OHIO; ASSIGNOR TO AMERICAN NARROW FABRIC GOHPANY, or womns'rnn, misssonnsn'r'rs, A CORPORATION or masssonusn'rrs.

INQULATOR PIN.

Original application filed lay 1a, 1920,

This invention relates to pins for support= ing insulators for various electrical conduc tors, and has for its object the provision oi devices of the class named which shall be of improved construction and operation.

p The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawings and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawingsg p Fig. 1 is-an elevation ofone embodiment of theinvention with parts in section;

Fig. 2 is an elevation with parts in section of a slightly different formof the invention; and

Fig. 3 is a similar view of another modification of the invention; V

This is adivision of application, Serial No. 380,826, filed May 12, 1920, Patent Number 1,657,340, dated January 24, 1928.. v

Insulators for electrical conductors are supported in a variety of ways, one of the common means being by theuse of pins carried by the supporting structure andbearm the insulator fitted over the end thereof; uch pins are used for supporting insulators on metal and wooden arms andpole tops and also on various constructions other than regular line wire supports. A pin to meet the requirements to which it is subjected must have the necessary mechanical strength to withstand the stresses brought upon it and should not materially lower the fiashover voltage of the insulator or otherwise diminish,

the electrical etliclency of the insulator. The cost of manufacture should be kept as low as possible and the pin should provide the required strength without setting up undue stress in the fragile material of the insulator The pin should also be. V p I bar stock without the loss of material.

which it carries.

adaptable to various conditions which arisein line construction and other electrical installations where insulators are used, and it is also desirable that the pins should be so designed that a large variety can bemade from as small a variety of stock as possible.

From the various embodiments ofthe invention shown in the drawin s, it will be apparent that the small body iameter of pins constructed in accordance with this invention permits developing the. maximum flashover voltage value of the insulator since the Serial No 380,826; A Divided and this application filed March 25, 1926. serial No. 97,187.

surface of the body at a maximum distance from the lower edge of the insulator itself.

It will also be seen that the supporting base and the body portion of the insulator pin are made in separate parts which permits the use of a base having sufficient area so that the cross-arm upon which the base. rests will not be crushed under bending moment. The can sti'uctio'n permits of a balanced arrangement and the same time does not sacrifice the electrical properties of the insulator. In pins having a small base formed integrally with the pin, the bending moment upon the pin forces the edge of the base into contact with the upper face of thesupporting structure so that where the structure is made of wood,

the fibres are crushed at the edge of the base,

permitting the pin to lean to one side and loosening the connection with the support. It is impractical to form a pin with an integral base of sufllcient area to overcome "this diliiculty, for the reason thatif the pin is out from apiece of stock of large diameter the wasteis too great to justify a sufficient oil pa-nse of base, and if it is undertaken to up set or swage a small r piece of stock to form the base, it is impossible to expand the mat-erial a suflici'ent amount to give a baseof the required extent- Such operation also tends to formlaps or flaws in the metaL Wherethe base is formed separately from the pin and is provided with means to hold the tw'origidly together, when the pin is installed, the base may be made of any desired extent and shape and pins maybe standardized sothat uie same,

pins may be used with a large" variety of sup, citing bases. A pin ma be secured to the ase by means of, a. tapeied end fitting in j a tapered socket and the ta ermay be so proportioned that the pins may be readily made with aswaging-machine from straightv No finishing operation is necessary other than the swagi'ng process in order to obtain a good fit for the base, The taper should be such 7 that the pin will not tend t'O' lift out of the base when a bending moment is applied. and

at the same time the ta er should preferabl be such that the pin wil not bend in the sma 1 sections, th smaller portion of the pin being reinforced by the base. When the bas'e'an body are assembled they are held togetheriso that they will work as aunitary structure and the main, body of the pin may be made -shell is tapered, as shown at straight section or given a taper which will give uniform.strength for the bending moment, or it may be made in stepped diameters, t desired. i

The insulator may be secured to thepin'in a large variety of ways, depending upon conditions. In some cases a lead tip may be cast or pressed on the pin which will form a cushn between the hard metal and the porcelain. The upper portion of the pin may, some conditions, be provided with a roughened surface, or with resilient flanges or projections, toreduce the danger of cracking the insulator under expansion and contraction of temperature changes. Another method of securing the insulator to the top of the pin 18 to provide theend ot'the pinfwith large or small. threads which can be adapted to 'a fhimble of sheet material threaded into the insulator. In thisconstruction the threaded parts may be cone-shaped and, the insulator may be tightened down firmly and afterwards the wire groove in the insulator may be properly alined by turning the pin relative to its supporting basef The thimbles, however, instead of being cone-shaped may be cylindrical, so that they can be turned upon the pins to aline the wire grooves-without looseningthe insulator on the pin." Where this arrangement is made, the pin can be'rigidly attached to the supporting base. Under most conditions, however, thepin and base will be separable which will permit combinations of vaious forms of pins with different kinds of bases so that the proper arrangement may be secured for a large variety of conditions.

In Fig. 1 a composite pin isshown comprising a central rod 51 having an outer strengthening tubular shell 52 surrounding the rod.

The rod and shell each forms a reinforcement for the other and thetwo co-operate toform an exceedinglystrongpin. The shell 52 is pressed into shapev from a straight tubular memberand atthe same time secured in place upon the central r0d51. The compression of the tubular member to form a taper will, of course, cause a gradual thickening of the wall of the pin from the top of the base portion to the, top of the pin, as shown in the drawing. Depressions 53 may be previously .formedin therod 51 at the points of contact "between therod and the shell, so that the metal of the shell will be forced into the de pressions during theformingoperation and thusinsure firm connection between the rod and the outer shell. The lower end of the 54, for engaging atapered socket member 59 and the ends of the rod 51 are threaded, as shown at 55 and 56, for connection with means for securing the pin on its support and with means for securing the insulator upon the pin, respectively. v

In Fig. 2 a pinis shown similar to that illustrated in Fig. 1, except that a portion of under member liavin shape and tapered to fit a socketmember 85 formed on'a base 86. An internal reinforcing sleeve 87 is arranged within the tubular member 84 to strengthen the pin adjacent the base and to provide material for a threaded openingfor receiving the threaded end of a bolt 88. lVhere the lower ends of the pins are threaded for receiving the threaded ends of standard bolts, it will be apparent that the pins may be secured to various sizes of crossarms by merely substituting bolts of different standard lengths.

I claim:

1. An insulator pin comprising a tubular member having a hodyportion tapered towards its upper end, an oppositely tapered base portion and a support for said tubular member having a tapered socket therein for receiving said tapered base portion and hav-' ing a flange extending radially from said base portion, the opening in said body portion being also tapered toward the upper end of said pin.

2. An insulator pin comprising a tubular member having an elongated body portion tapered toward its upper end, the opening in said body portion being also tapered toward theupper end, a shorter oppositely tapered base portion, a supporting base having a tapered socket therein for receiving said base portion, and a reinforcing member disposed within said base portion,

the opening in said ,body member being larger than said reinforcing member at the junctionof said body 1 and base portions.

3. An insulator pin comprising a tubular 0 the opposite ends thereof. swaged-lnwart ly to provide an upwardly tapering elongated body portion and a lower oppositely tapered base portion with the maximumdiameter of said pin at a point adjacent the top of said base portion, the walls of said tubular member being gradually thickened from the point of maximum diameter toward the top of said pin, and a support for said tubular member having a tapered socket therein for receiving said tapered base portion and having a flange extending radially from said base portion.

4. An insulator pin comprising a tubular member having an elongated upper body portion tapered inwardly toward the top thereof, abase portion tapered inwardly toward the bottom thereof, and a reinforcement disposedwithin said base portion and tightly held in place therein by the walls of said base portion, said walls being spaced away from said reinforcement between the ends of said pin. 7

5. An insulator pin comprising a tubular member having a central reinforcing rod extending therethrough, said tubular member being fixedly secured to said rod against relative longitudinal movement of said rod and ber being spaced from said rod intermediate the ends of said tubular member but tapered inwardly to engage said rods at opposite ends of said tubular member, the upper tapered end of said tubular member being longer than the lower tapered end thereof.

8. An insulator pin comprising a tubular member having a reinforcing rod extending therethrough, said tubular member being spaced outwardly from said rod intermediate the ends thereof but tapered inwardly to engage said rod at opposite ends of said tubular member, and a supporting base engaging the lower tapered end of said tubular member, said rod being extended beyond said tubular member at the opposite ends thereof.

9. An insulator pin comprising a tubular member having a reinforcing rod extending therethrough, said tubular member being tapered inwardly toward the opposite ends thereof, a supporting base for receiving the lower tapered end of said tubular member, and having the upper extremity thereof substantially registering with the maximum diameter of said tubular member, said tubular member being spaced outwardly from said rod at the point of maximum diameter of said tubular member.

10. An insulator pin comprising a tubular member having a reinforcing rod extending theret-hrough, said rod having irregularities on the surface thereof adjacent opposite ends of said tubular member, said tubular member being swaged inwardly to engage said rod and to conform to the irregularities on the surface thereof to provide firm connectionbetween said tubular member and rod at opposite ends of said tubular member, said tubular member being spaced outwardly from said rod intermediate the points of connection with said rod and being gradually tapered toward the opposite ends of said tubular member from an intermediate point. 11. An insulator pm comprising a tubular member having a reinforcing rod extending thercthrough, said. tubular member being,

spaced outwardly from said rod at apoint between the ends of said tubular member and gradually tapered toward said tubular memer at opposite sides of said point and closely engaging said rod at the ends of said tubular member, said rod being extended beyond said tubular member, and a supporting base having a socket receiving the lower tapered end of said tubular member.

In testimony whereof I have signed my name to this specification on this 20th day of March, A. D. 1926.

ARTHUR o. AUSTIN.

CERTIFICATE OF CORRECTION.

Patent No. 1,690,392. Granted November 6, 1928, to

ARTHUR 0. AUSTIN.

It is hereby certified that the above numbered patent was erroneously issued to "American Narrow Fabric Company, of Worcester, Massachusetts, a corporation of Massachusetts, whereas said patent should have been issued to "The Ohio Brass Company, of Mansfield, Ohio, a corporation of New Jersey", said corporation being assignee by mesne assignments of the entire interest in said invention, as shown by the records of assignments in this office; and that the said Letters Patent should be read-with this correction therein that the same may conform to the record of the casein the Patent Office.

Signed and sealed this 11th day of Decemher' AaD.1.928.

M, J. Moore, (Seal) Acting Commissioner of Patents

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