US1251097A - Strain-insulator. - Google Patents

Description

40 Fig. 1;

' To all whom it may concern:

UNITED STATES PATENT 0 JOHN M. PECK, 0F VICTOR, YORK, ASSIGNOR TOTHE LOGKE INSULATOR MFG. 60.;

, or vrqron, new YonK, A conro'na'rron or new YORK.

sraam-msonaron.

I Specification of Letters Patent.

Patented no... 25, 1am.

'Applicatio'n'flled January 25, 1917-. fSerialNo. M4346.

Be .it known that I, JOHN Victor, in the county of Ontario and State of New York, have invented certain new and useful Improvements in Strain-Insulators; and I do hereby .declare the following to be a full, clear, and exact description of the same, reference being hadto the accompanylng drawings, forming a part of this specifi-' cation, and to the reference-numerals marked thereon. Y

My invention relates to insulators of the type employed for supporting high tension and heavy electric conductors which frequently require being suspended by a series of insulating units attached one to the other and commonly known as strain insulators, and it is my objectto afi'ord an eflicient construction that can be'manufactured and assembled at a reasonable cost. A further purpose is to utilize the fewest possible number of parts and also to so connect the insulating material with the Connecting members as n t to weaken the insulating material and to impart maximum strength and resisting force to the unit as a whole. To these and other ends the invention consistsin certain improvements and combinations of parts all as will be hereinaftermore fully described,

the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a sectional view with the parts in ele vationshowing the application of my invention to a well-known type of strain in-.

sulator, with the parts in the initial assemshown in Fig. 6, and the cap can then be elevated until the locking rods 12 engage the Fig. 6 is a sectional view on the line 6 6 of Fig. 3.

Similar reference characters 1n the several figures indicate the same parts.

In the construction shown in the drawings, which it will be understood are intended merely to illustrate'a possible embodiment of the invention in ra'ctical .form,

there isshown a usual form of insulating section or portion including the skirt portion M. PEoK, 'of- 1 and. the upper or bodyportion 2 which latter is hollow and provided interiorly and carried by the insulating portion and pro vided withthe' eye by which it is connected to the ad acent insulating unit, the cap 6 and the rod or pin 8, constituting the two connecting members, usually formed of metal and aflording means for tying or connecting to the adjacent insulating units disposed above and below the one shown. The cap 6, according to my present lnvention is provided at its lower edge with an internal annular locking groove or channel 9 and adacent thereto immediately above 1s a sec ondary groove 10, largerand of greater diameter. The cap is also provided with openings 11 to permit access from the exterior to within the secondary groove 10. In the assembling of the cap upon the body of the insulating. section I employ two or, more curved rods 12 formed. of stiff metal, and

groove 10, substantially in the manner shown in .Fig. 5. \Vith the locking rods 12 thus arranged in the grooves 10. th'e'cap is placed upon the insulating section in the these are positioned withinth'e secondary position shownin Fig. 1. Any suitable instrument is then inserted through the, openings 11 to force the locking rods into the groove 1- until they assume the position groove 9 in the manner shown in Fig. 2. In order to hold the parts in this position and relatively fixed, I employ retaining means in the form of threaded pins- 13 which are inserted through suitable threaded openings in the cap, and brought into engagement with the locking rods 12, or any other retaining 111II1S,f01 holding the rods in this relation. Preferably, the rods are so proportioned that. when in final adjusted position they form a continuous ring, as shown in Fig. 6, with their adjacent ends in contact with each other and of the same diameter as the groove 4;, and thus a continuous and uninterrupted line of contact is had betw'ien. the metal cap and the body portion of the insulating material, and the strain upon the insulating material is equally distributed throughout the same. This adds greatly to the strength and durability of the strucbeen referred to as'B, and is provided with a locking groove 2 into shown in Figs. 2 and.

tion of tension to the pin 8, it is withdrawn locking shoulder or groove 14 and adjacent thereto a secondary groove or channel '15 which is deeper and of less diameter. The locking member employed in this particular relation .is in the form of a spring or split v ring 16 which is of such size that when in normal or uncontracted position, it fits closely in the groove?) and is immovable therefrom. In the assembling of. the pin 8, the locking ring. 16 is positioned in the groove 15 as shown in Fig. 4; and is contracted. by engagement with the inner wall 17 of the insulating section. The pin, with the locking rin thus contracted, is forced inwardly -unt1l the ring reaches the annular which'it expands, as

4. Upon the applicauntil the locking groove or shoulder is engages the ring 16, as shown in Fig. 2, and the parts are held permanently in this relation.

The structure shown and described may be modified without departing from the invention, and I intend cove-ring by this application any changes or different forms com ing within the purpose of my improvement and the scope of the appended claims.

I claim as my invention:

1. In a strain insulator, the combination with a section of insulating material having an annular locking groove, of a metallic connecting member having an annular locking groove adapted to be alined with the aforesaid groove and a secondary groove or channel adjacent. to the locking groove on the connecting member, and a stificurved looking rod adapted to be positioned in the secondary groove of the connecting member during the assembling operation and, when finally positioned, to cooperate with the recess formed by the locking grooves on the insulating section and connecting member to hold them against relative separating movement.

2. In a strain insulator, the combination with a' section of insulating material having .anannular locking groove, of a metallic connecting member having an annular locking groove adapted to be alined with the aforesaid groove and a secondary groove or 'channel adjacent to the locking groove on the connecting member, and a stiff curved locking rod fixedly held in'the groove of the insulating section and cooperating with the groove of the connecting member so as to prevent removal of the latter.

3. In a strain insulator, the combination with a section of insulating material having an annular locking groove, of a metallic connecting member having an annular looking. groove adapted to be alined with the aforesaid groove and a'secondar-y groove or channel adjacent to the locking groove on the connecting member, and a series of stiff curved locking rods adapted to be positioned in the secondary groove of the connecting. .member during the assembllng operation and, when finally positioned, to cooperate with the recess formed by the locking grooves during the assembling operation and, when finally positioned, to cooperate with the recess formed by the lockinggrooves on the insulating section and connecting meniber and acting to retain them against relative separating movement, and retaining means carried by the connecting member and en- I gaging the locking rods to retain them in the grooves of the insulating section.

5. In a strain insulator, the combination with a section of insulating material having an annular locking groove, of a metallic cap having a locking groove at its lower edge and a secondary groove adjacent to the locking groove, a plurality of locking rods adapted to groove during assembling and to cooperate with the recess formed by the locking grooves when finally positioned, and retaining pins carried by the cap and engaging said locking rods to prevent their removal from the 110 groove of the insulating section.

JOHN M. PECK.

be positioned in the secondary

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