US1266711A - Strain-insulator. - Google Patents

Description

B. A. PLIMPTONI STRAIN INSULATOR.

APPLICAHON FILED JAN.25. I917.

1 ,266,7 1 1 Patented May 21, 1918.

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. AFPLIC .25.1917. v 1 ,266,71 1. Patented May 21,1918.

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STRAIN-INSULATOR.

Specification of Letters latent.

Patented May 21, 1948.

Application filed January 25, 1917. Serial in. 144,347.

To all whom it may concern:

Be it known that T, BENTLEY A. PLIMP- TON, of Victor, in the county of Ontario and State of New York, have invented certain new and useful Improvements in Strainl nsula-tors; and I do hereby declare the following to'be a full, clear, and exact description of the same, reference being had to the accompanying drawin s, forming a part of this specification, an to the reference characters marked thereon.

The invention has for its object to improve the structure of strain insulators, more particularly with a view to affording a cementless connection between a metal cap, stud or connecting member, and the insulating portion or member of the usual type of strain insulating unit. A-further object of the invention is to afford a connection that will be sufliciently strong to withstand any of the strains to which such an insulator is usually subjected, also to entirely eliminate the use of cement in joining a cap, stud or connecting member, and the insulating portion, and further to pro vide an economical construction that can be v readily made'and assembled without eXces sive cost. To these and other ends the invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a side elevation of an insulator constructed in accordance with my invention;

Fig. 2 is an enlarged sideview showing the metal cap in section, about to be assembled on the'insulating unit;

Fi 3.is a sectional view showing the position of the parts after the cap is locked Fig. 4 is a horizontal sectional view on the line t e or Fig. 3;

Fig. 5 is a vertical sectional view taken centrally of the'insulator, and

Fig. 6 is a horizontal sectional view on the line 6 of Fig. 5.

' Similar reference characters throughout the several'views indicate the same parts.

According to the'construction herein disclosed, which'illustrates a possible embodiment for carrying out my invention, there is shown a usual type of straininsulator embodying a metal cap 1 and an insulating portion or member which includes the flaring portion or skirt 2 and the head or top portion 3. The top portion?! has formed thereon what I have termed a thread, indicated by 4 and extending partially around .the insulating unit and terminating at its The cap 1 is provided at its lower portion with an inturned flange 6 and carries a locking member having one end in fiXed relation and the other end in movable relation therewith to permit separation of the ends, and threading the locking member on the insulating portion. Vith this in view I preferably employ a split ring designated by 7. One end of the said ring has an outwardly extending projection or lug 8 which engages an opening or recess 9 in the cap, while the other end of the ring is movable so as to permit the parts to assume the rela tive position shown in Fig. 2, where the free end of the locking member is engaging the upper side of the thread 4 and the fixed end lies between the opposite ends of the thread 4 and is aboutto pass under the shoulder 5. This is the first position that is assumed when the cap is assembled upon the insulating portion and by turning the cap to the right from the position shown in Fig. 2, the locking member is carried with it until itis entirely under the thread 4 and locked in place by the shoulder 5. After this relative positioning of the parts is accomplished it is practically impossible to remove the cap from the insulating portion except by breaking one'of the parts. When the locking member is in locked relation, it rests upon the flange 6 and is located between it and the lower edge of the thread 4, as shown clearly in Fig. 3.

In the usual operation of devices of this character, it is common to employ several insulators which are interconnected and support a conductor, for which purpose the cap 1 carries a lug or extension 10 having an opening 11 that receives a pin 12 cooperating with a connecting member 13 on the adjacent insulator unit. Each insulating portion is formed hollow to receive a stud 'or connecting member 13, the same being also hollow as shown in Fig. 5, and provided with the openings 14 in whichthe pin 12 is located. It is necessary to retain the connecting member or sleeve 13 within the hollow portion of the insulating portion and to this end the latter is provided with a shoulder 15 which receives a plurality of locking devices and thereby prevents the connecting member 13 from being withdrawn. The

connecting member or sleeve 13 is provided 'with a series of openings 16 within which are, located the locking devices 17 These latter are in the form of blocks which are freely movable in the openings and are provided with'inclined or beveled surfaces 18 to engage the shoulder 15 aforesaid. The locking devices 17 are prevented from withdrawal away from the locking shoulder by means of a sleeve or thimble 19 located within the connecting member and held in place by any suitable retaining means. In assembling the parts just described, the connecting member is first inserted within the hollow portion of the insulator, and the lockingdevices 17 are then inserted in the ment with said shoulder I 20 therewithin,

I portion having a thread 1 in a locking shoulder,

connecting member and forced through the openings 16 by' any. suitable instrument or tool for the purpose, un'til theyengage the shoulder 15. The thimble or sleeve 19is then dropped or positionedwithin the connecting member with its outer surface engaging the inner ends of the locking devices 17. The thimble 19 is held in lace'preferably by inserting a cement filling material as shown in Fig. 5.

I claim as my invention: 1. The combination with an insulating portion having a thread thereon terminating of a cap cooperating insulating and carrywithdrawal from the locking la tter.

of a cap at ing a'locking member having one end in fixed relation and the other end in movable relation with the cap to permit the locking member to be threaded upon theinsulating portion and to lockingly engage under said thread. I

4. The combination with an insulating portion having a thread thereon terminating in a shoulder, of a cap secured upon the insulating portion and carrying a locking member in the form of a split ring having one end in fixed relation and its opposite end in movable relation with the cap to permit threading the locking member upon the insulating portion and bringing it into locked relation with said shoulder.

5. The combination with an insulating portion having a locking shoulder extending partially therearound, of a cap secured upon nheinsulating portion and carrying a lock- 111g member in the form of a split ring, one end of which engagesa recess in the cap while the opposite end is freelymovable to upon the insulating portion by initially placing the free end of the locking member beneath said shoulder'andturning the cap until the entire'locking member is disposed beneath the shoulder.' I

6. The combination with a hollow insulating portion having alocking shoulder therewithin, of a hollow connecting member arranged within the insulating portion and having a, plurality 'of openings, of locking devices movable within said openin gs and having engagement with the aforesaid locking shoulder, retaining means engaging the locking devicesto prevent their shoulder, and

permit the locking member to bethreaded a plurality a cementitious filling medium within the connecting member engaging the retaining means and preventing withdrawal of the 7. The combination with an insulating portion having a locking shoulder extending partially thereai'ound, of a cap secured upon the insulating portion and carrying a mov-' able locking member adapted to be brought into locking relation with'the shoulder by turning the cap on the insulating portion.

I BENTLEY A. rninrrorif I

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