US2613913A - Strain carrier for twin strings of insulators - Google Patents

Description

Oct. 14, 1952 D. c. HUBBARD 2,613,913

STRAIN CARRIER FOR TWIN STRINGS OF' INSULATORS Filed Jan. 5, 1950 2 SHEETS- SHEET l 88 l Z709' 69 l 15| 1 i l5 20` I` 83 I@ nf Oct. 14, 1952 D. c. HUBBARD 2,613,913

STRAIN CARRIER FOR TWIN STRINGS OF' INSULATORS Filed Jan. 5, 195o 2 SHEETS- SHEET 2 90-F af IN VEN TOR.

Patented 'Oct 14, 1952 STRAIN CARRIER FOR TWIN STRINGSv F INS'ULATORS' David Charlesjlinbbard, Centralia, Mo.. assignor to A.: B. Chancey Company, Genti-alia, Mo., a.y corporation of Missouri Application-January 5, 1950,l Serial No. 136,995

17 Claims.

The present Ainvention relatesto strain carriers. for twin strings. of insulators, and is particularlyl concerned with the provision of.' an improved tool adapted` tol relieve thev strain from one of the strings of dead end insulatorsl where twolstringsare mounted in parallel and attached to line yoke place.

One of the objects of the invention is the pro-v vision. of an improved tool which provides a maxi--V mum insulation becausey theV metallic tightening mechanism; is located outside or beyond the torque arms or lever arms, leaving the full length of the wooden insulating members between the lever arms available as insulation..

Another object of' the. invention is. the provision of.` anL improved tool` construction which includes parallel tension boardsso thatl the same existing torquearmsj, which` are designed for yoke plates and that are now employed on working de-energized lines may be used with the present tools.

y Another object is to provide animproved strain carrier whichis adjustable` in length for the vari.- ance in numberv of. insulating units or variance in the: dimensions of thehardwarezemployed; and in which. the adjustments are, readily made by merely vremoving one eye nut.

Another object of'v the. invention is the provision of; an improved. tool in which the wooden tension members are reinforced at the hinge jointv and, prevented from spreading, even though the wooden member splits or becomes checked, and in which` the operating, jackr isY positioned close to the operator..

Another object of the invention is the provision. of an improved strain carrier which is applicable to different types of yoke plates by employingany adapter.

AV further object of thel invention is the provision of an improved strain carrier in which the force applying element is so arranged that it exerts a push on the tilting lever instead ofv a pull, therebyy eliminating metallic parts on the` wood. and insulators between the two lever arms and increasingv the insulationv over the devices which exertA a pull; on the levers byfhaving metallic parts between the two tilting levers.

Referring to the drawings, of whichthere Vare twosheets.,

Fig. 1 isa top plan view of the present strain carrier applied to a twin insulator installation and in position to relieve the strain on the right hand stri-ng of insulators;

, Fig. 2 .is a fragmentary elevational View, taken from the4 right of Fig. 1;

Fig 3 is a fragmentary plan View like Fig. l,A

2. showing' they use of the same tilting: lever cna-a.- diferent type of yoke, without. the adapter.;

Fig. 4 is a fragmentary sectional view,v taken on the plane of the line 4-4. of Fig. 1lookngin ythe direction of the. arrows and on. a. larger scale;v

Fig. 5. is a similar fragmentaryfsectionalvievn taken on the plane of the line 5-5 of Fig. 1 1001i.-- ing in the drectionof. the arrows;y l,

Fig. G is a; fragmentary sectional View, takenon the plane-of theline 6.--6 of Fig. 1,v looking in theI directionof the arrows.;

Fig. '7 is a view in perspective of the. adapter byL means of which the same tilting lever which., is usedy on solid ilat yokes in Fig. 3, may be applied tothe different type ot yoke, as shown in Fig. l..

Reierring'to Figs. 1 .and 2,. the present strain. carrier is. intended to be used forr relieving/chel strain on one of a pair ofstrings of insulators* such` as the two strings indicated atgIIland` kl (Fig. l), each4 ofwhich is comprised of aplural-ity of similar insulators I2.

The ends of these strings are pivotally. mounted onvthe two yokes I3 and I4 by means of the bolts or rivets` I5 pivotallyA mounted in thelugsfy t6., The yokes in question are usuallyl provided with a pair of centrally located pivot flangesl 'I and I8v at the apex of the triangularl yoke, these flanges being provided with a through bolt I9 for secure-ay ment of the chain link 20.

Two types of yokes areemployed, such as 'that shown at I3 in Fig. 1, infwhich the yoke has a pair of triangularl openings 2|'. 22 and the yoke- 23-of Fig. 3, which comprises a iiat triangular plate with rounded corners.

The present tilting levers are applicable to both types of yokes; and since the yoke 23 is simplest, it will be described first. Yoke 23 has apertures.' atA its two lower corners (Fig. 3) for receivingjthe stub bolts 24, 25, which pass through the parallel anges of the insulator supporting xture 2G, and` are secured by cotter pins.

The tilting levers in Fig. 1 are indicated'in their entireties by the numbers 28 and 29, and they are identical in construction, For exampla in Fig. 3 the tilting lever 28v is applied to the Yoke. 23.' The tilting lever 28 comprises an elongated" metal casting which tapers in width towardits actuating endV 30. At. thatend it is provided with, a tubular formation 3I,` serving as a bearing by means of its throughbore 32..

The tilting lever 2S may have its tapered .por-f tion formed by a central web 33bounded by the two reinforcing border flanges y34 and3.5.' Thisk construction. makes theleverlighter inweig'ht. and stronger. Aty its left end in Fig. 3 the tilting lever 28 has a laterally turned end portion 36 which may be substantially triangular, ending in an apex 31.

The laterally turned end portion 36 comprises a pair of flanges 38 and 39 (Fig. 5) separated by a rectangular slot 40. The slot 40 is wide enough to receive the flat plate 23; and the tilting lever 28 or 29 is suitably thickened, as indicated by the oisets 4I at the end, so that there may be suicient body left when the slot 40 is enlarged to receive the yoke I3.

The base 42 of the slot 40 (Fig. 5) extends along a diagonal line, as again indicated at 42 in Fig. 3, so that it may fit against the diagonal edge 43 of the yoke 23. The lever 28 is adapted to bear down against the edge 43 of the yoke 23 by means of the base 42 of the slot.

At the triangular point 31 of the laterally turned end 36 of the lever 28 there is formed a kind of tubular enlargement 44 which has a through bore 45 for receiving the cylindrical body 46 of an eye bolt 41. This eye bolt bears against the lower (Fig. 3) straight edge 48 of the yoke 23.

The right and left hand portions of the yoke 23 taper toward the bolt 25; and the tilting lever 28 would slip ofi the tapered part of the yoke 23 were it not for the fact that the insulator iixture 26 has rounded attaching flanges 49. The tilting lever 28 has its border ilange 35 curved at 50 on each of the legs 38 and 39 to bear against the round attaching ilanges 49 of the insulator string xtures 26.

Thusv the xtures 26 keep the tilting levers 28 from passing oi the tapered ends of the yokes 23. The slot 48 is of uniform width between the anges 38 and 33 from the base 42 to a pair of diagonal shoulders I and 52 (Fig. 5) beyond which the laterally turned portion 3S of the lever has a Wider slot, indicated by the number 53. This wider slot 53 is wide enough to pass the border ilanges of the thicker yoke I3 of the type shown in Fig. l.

Referring to Fig. l, the yoke in this case has a thin web 54 surrounding each of the triangular apertures 2| and 22; and the web 54 is surrounded by the substantially triangular border flange 55. The border ilange 55 extends diagonally downward in Fig. l on the top of the yoke I3, and is adapted to fit against the two shoulders 5I and 52 (Fig. 5 of the lever 28 in Fig. l).

lThe laterally turned end portion 35 of this lever then extends down across the triangular aperture 22; and the cylindrical body of the eye bolt 41 passes through the triangular aperture 22 and fits in the rounded corner of aperture 22 in Fig. 1.

The two flanges 38 and 39 of the tilting levers 28 or 29 are provided with laterally projecting bosses 56 (Fig. 3) with through bores 51. This through bore 51 is adapted to receive a screw bolt 58 (Fig. l) which is provided with a suitable head and nut, and the screw bolt 58 supports an adapter of the type shown at 59 in Fig. '1.

This adapter 59 may consist of a relatively small diamond shaped metal member, which may be in the form of a flat plate, or which may be cast with a border ange 60 and web 6I. In either event, the adapter 59 nts in the slot 4I); and its upper flat surface 62 ts against the base 42 of the slot 48. The opposed fiat surface 63 of the adapter bears against the diagonal edge 84 of the yoke I3 when the adapter is used. The adapter is held in place by the through bolt 58, which passes through an aperture 65 at the upper left corner of the adapter 59 in Fig. 7.

- The tilting levers 28 or 29 have their border 75 4 flanges provided with enlargements 66 with a through aperture 61 at a point which is within the boundaries of the insulators I2 so that aperture 61 may support an eye bolt 88 having an eye 69 large enough to receive a wooden rod 10 serving as part of an insulator cradle.

Another similar enlargement 1I is formed on the outer surface or edge of the rounded laterally extending portion 36 provided with an aperture 12 for receiving another similar eye bolt 13. The eye bolt 13 carries the second rod, which forms an insulator cradle; and the two parallel rods 18 are supported by eye bolts from the two tilting levers 28, 29.

Thus the mechanism supports the insulator after its strain has been relieved; and while the ends of the insulator string are being attached or detached from the yoke.

At its free end each tilting lever 28 and 29 is engaged by the wooden tension arms 14, 15 by means of suitable pivot assemblies 16, 11. The tension arms may be of suitable length to cover the complete range of insulator string lengths; and various tension arms may be used interchangeably with the tilting levers or torque arms 28, 29.

Each tension arm consists of an elongated ilat strip or" well dried tough wood coated with a suitable layer of insulating varnish; and the strips are preferably rectangular in cross section, flat, and relatively wide as compared to their thickness.

At the jack end of the tension arms, that is, the upper end in Figs. l and 2, the two tension arms are joined and held in spaced relation, parallel to each other, by a metal block 18 (Fig. 6), which has flat ends 19 and 80 for engaging the tension arms 14 and 15. Registering through bores 8I and 82 are provided through the block 18 and through the tension members 'I4 and 15 for receiving the screw bolts 83, which are provided with nuts and tightened to clamp the tension members 14, 15 against the block 18.

The block 18 is provided with a central threaded bore 84, the threads of which are complementary to a screw shaft and the block is preferably provided with a tubular extension 85 about the bore 84 to increase the area of engagement between the threads of the block 18 and the threads of the shaft 85.

The block 18 may also be provided with tubular extensions 81 about each of the bores 8|, 82, extending into apertures in the tension members 14, 15 for increasing the area of contact between the block and the tension members; and the bolts 83 are provided with suitable washers. The length of the tubular extensions 81 is substantially equal to the thickness of the tension members 14, 15.

At its outer end the shaft 85 may be squared or provided with a hexagonal portion 88 to be received in the complementary socket of a ratchet lever 89.

At its inner end the shaft 85 is rotatably engaged in a socket in the sliding block 98, which is provided with guide flanges SI (Fig. 4) for engaging the inside of the wooden tension members 14, 15, and with additional guide ilanges 92 for engaging the edges of the wooden tension members 14, 15. Thus the block is adapted to slide between the tension members 14 and 15.

At its inner end the block 90 is provided with a partially circular socket 93 (Fig. 1) for engaging the cylindrical end or bearingportion 38 of the upper tilting lever 28.

The' guide flanges 9`|, 92 project below the body of the block 90 (Fig. 21), providing arecess large enough toi-receive the bearing portion 3| of the tilting lever 28;'r and the tilting lever is provided with a stub shaft 91|, passing through the aper ture 32 and engaging shallow grooves 93, which arel formed in the lower edge of the downwardly projecting portion of the block 90.

The stub shaft 94 is confined by being mounted between the tension members 1'4l and 15; and the block 98 may be secured on the end of the shaft 85 by providing an annular groove in the shaft, indicatedr at 9B, and' by the transverse pin 91 passing through the block and locatedin the annular groove 9S. Two such pinsmayf be employed, if desired.

rlihus the assembly- 1tl at the upper end of the tension members 14, 15 in Fig. 2 is adaptedV to exert a pressure on the end of the tilting lever 28 by means of the jack screw 85 and ratchet lever 8'9.

At their opposite ends the tension members 14, 1.5 are provided with a multiplicity of regularly spacedv apertures 98, 59 preferably" arranged in pairs for engagementv with the pivot stirrup |00, which forms a part of the assembly 11 at the lower end of the tension membersr 14, 15.

: The pivot stirrup may comprise a cast metal member'having a pair of parallel flanges I0| and" |02 joined by an integral shaft |03 and held parallel" to each other in position to engage the inside ofthe wooden tensiony members 14, 15.

The stirrup |00 acts as a spacer and is provided with laterallyprojectingA cylindricalv lugs |04 at eachv end of the shaft |03 for engaging in the apertures v99 ofthe tension members 14, 15'. The parallel flanges. or plates I'0I, |92 of the stirrup have apertures |05 adjacent their opposite ends to register with the apertures 90 in the tension members 14,15.

In order.` to reinforce the wooden tension members 14., against splitting, eachv one is covered at the assemblyv 11 by means of ametal plate |06, IU1'which engages the outside of each tensionmember 14, 15 and has a pair of" edge engaging iianges |68, |00. The edge engaging flanges hub the edges of thewooden tension members14, 15 and prevent them from splitting.

The reinforcing plates |06', |01 are provided with. apertures ||0` for passing the cylindrical,

shanks of the eye bolt III. The eye bolt I II also passes through the apertures 99 in the tension members 11|,` 15 and extends into the bearing ai!" erture 32 of the lower, tilting lever 29'.

The cylindrical shank ||2 of the eye bolt I|| may extend through the plates |06, tension members 14, 15, tilting lever 29, and plate |01; and may be provided at its opposite end with threads at I-I3y for engagement with the threads of an eye. nut I'I4. Thus the lower tilting lever 29 in Figs. 1 and 2 is pivotally mounted between the tension members 14, 15 atan adjusted position sov that the length of the tension members 14, 15 issuitable for relieving the strain onan insulator string of a particular length.

The method and operation and use 'of the strain carrier is as follows; If the yoke is of the type comprising a flat plate. as indicatedr at 23, the tiltingl levers 28, 29 are used without the adapter 59. If' the yoke is of the type shown in Fig. 1, the adapter 59' must be pivotally mounted on the bolt 58. n

' The strain carrier is first adjusted to a. suitable length by having the pivot assembly 11 and the lower tilting lever 29 secured to the tension members14g15 at the :proper pair;l of

The jack screw 85' is preferably retracted outward as muchas possible: in orcler'tov provide it with an operatingA range.v when the: carrier is attached to the yokes. The two tilting levers are then mounted on the yokes, the yokes being received in the grooves between thexslotted ends. ofy the tilting. levers; and the tilting levers are. secured in. placey by inserting .theceye bolts V41 in the apertures 4.5,` the eye boltfpassing` through theA triangular aperture 22 in Fig.. 1' ofA the yoke:v I3, or the eye boltlpassesl belowv the lower-edge 48 of the yoke 23, as shown ink Fig. 3..

The base azA of the. S1015 4o in each` uiting lever 28 or 29 bears againsty the diagonal` edge 4'3""01' each yoke; in Fig. 3 or it isv the adapter: which. bears; against thisy edge. 64 in Fig'. l.

The open eye bolts 69. and I3 are. then. provided with elongated wooden rods, which serve as a.v

94 carried by tilting lever 28. This effectively'.

shortens the space, between the tilting levers- 28, 29, tension being placed upon. the tensionmembers 14, 15 to pull the free ends of-thelevers 28, 29 toward each other.

The otherends of the levers 28,. 29 are in eectv rigidly connected to they yokes I3, I4 (Fig. 1),; and the two yokes` are. causedto pull toward eachother on the side on which. the strain carrieris applied. This shortens. the space between the two points of attachment I5', I5 of the insulator string II and removes the strain fromY this insu,- lator string. the strain being taken bythe ten-` sion members 14. 15.

The insulator string may then be removed, re.- paired, and replaced; and the: jack shaft may' be backed ofi to place the strain. again on the insulator string. All of; the parts of the strainv carrier which have tobe handledv when4 iti is applied tothe line are insulated or providedwith eye bolts, such as the eye bolts- 41, so that they can be manipulated by meansy ofy an insulated clamp stick.

yIn the present device they jackA is located outside ofthe torque levers, thus eliminating entirely metalparts between the torque levers and increasing the insulation. Increasedinsulation is of the utmost importance in a tool of thisy kind... as it reduces the possibility of leakage currents; or surge flash-over, andthus increases the safety to the operator. The jack is also located inthe present device more conveniently for the user.

The present strain carrier is usable with all types of yoke plates; and it is not necessary to have two sets of torque. arms. The length of the strain carrier can be adjusted for any lengthy of. string insulator.

The wooden tension. members are reinforced. against spreading or splitting; and the torque arms are pivotally connected to the tension meme. bersv to permit the pivotal movement which is necessary.

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit lof the invention; and' I do not wish toA be limited to the preci'sedetails of construction setl forth; butdesire The device is now ready to` relieve` the to Vavail myself of all changes within the'scope of the appendedeclaims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

l. In a strain carrier for relieving the strain of one of a pair of string insulators supported by yokes, the combination of a pair of insulating tension members, said tension members being secured in spaced relation and parallel to each other, with a pair of torque arms, both torque arms having free ends pivotally mounted between said tension members and both torque arms being provided at their opposite ends with means for fixed securement to the yokes which carry the string insulators, and force multiplying means mounted between said insulating tension members and exerting a push on one of said torque arms to tilt the yokes which support the string insulators and relieve the strain on one of sai d string insulators, the said force multiplying means being located outwardly of both torque arms so that the insulating tension members utilize the entire space between the torque arms for insulation.

2. In a strain carrier for relieving the strain of one of a pair of string insulators supported by yokes, the combination of a pair of insulating tension members, said tension members being secured in spaced relation and parallel to each other, with a pair of torque arms, both torque arms having free ends pivotally mounted between said tension members and both torque arms being provided at their opposite ends with means for xed securement to the yokes which carry the string insulators, and force multiplying means mounted between said insulating tension members and exerting a push on one of said torque arms to tilt the yokes which support the string insulators and relieve the strain on one of said string insulators, the said force multiplying means being located outwardly of both torque arms so that the insulating tension members utilize the entire space between the torque arms for insulation, said force multiplying means comprising a screw shaft mounted in a threaded member xedly secured between said insulating tension members, the end of said shaft urging one of said torque arms inwardly.

3. In a strain carrier for relieving the strain of one of a pair of string insulators supported by yokes, the combination of a pair of insulating tension members, said tension members being secured in spaced relation and parallel to each other, with a pair or torque arms, both torque arms having iree ends pivotally mounted between said tension members and both torque arms being provided at their opposite ends with means `for fixed securement to the yokes which carry the string insulators, and force multiplying means mounted between said insulating tension members and exerting a push on :one of said torque arms to tilt the yokes which support the string insulators and relieve the strain on one of said string insulators, the said force multiplying means being located outwardly of both torque arms so that the insulating tension members utilize the entire space between the torque arms for insulation, said force multiplying means comprising a screw shaft mounted in a threaded member xedly secured between said insulating tension members, the end of said shaft urging one of said torque arms inwardly, said shaft being rotatably mounted upon a sliding member guided between said insulating tension members and having -a socket for engaging a curved formation on the end of the adjacent torque arm.

4. In a strain carrier for relieving the strain of one `of a pair of string insulators supported by yokes, the combination of a pair of insulating tension members, said tension members being secured in spaced relation and parallel to each other, with a pair of Itorque arms, both torque arms having -free ends pivotally mounted between said tension members and both torque arms being provided at their opposite ends with means for iixed securement to the yokes which carry the string insulators, and force multiplying means mounted between said insulating tension members and exerting a push on one of said torque arms to tilt the yokes which support the string insulators and relieve the strain on one of said string insulators, the said for-ce multiplying means being located outwardly of both torque arms so that the insulating tension members utilize the entire space between the torque arms for insulation, the said torque arms being formed at said opposite ends with -a pair of lateral flanges separated by a slot, the said slot tting over and having its base engaging the diagonal ledge of the adjacent yoke, and means carried by the said flanges for eng-aging the opposing surface on said yoke to iixedly secure each torque arm to its yoke.

5. In a strain carrier for relieving the strain of one 1of a pair of string insulators supported by yokes, the combination of a pair of insulating tension members, said tension members being secured in spaced relation vand parallel to each other, with a pair or torque arms, both torque arms having free ends pivotally mounted between said tension members and both torque arms being provided at their opposite ends with means for iixed securement to the yokes which carry the string insulators, and force multiplying means mounted between said insulating tension members and exerting a push on one of said torque a-rms to tilt the yokes which support the string insulators and relieve the strain on one of said string insulators, the said force multiplying means being located outwardly of both torque arms so that the insulating tension members utilize the entire space between the torque arms for insulation, the said torque arms being formed at said opposite ends with a pair of lateral flanges separated by a slot, the said slot tting over andv having its base engaging the diagonal edge of the adjacent yoke, and means carried by the said flanges for engaging the opposing surf-ace on said yoke to fixedly secure each torque arm to its yoke, said latter `means comprising an eye bolt passing through both flanges and engaging the inner side of the yoke.

6. In a strain carrier for relieving the strain of one of a pair of string insulators supported by yokes, the combination of a pair of insulating tension members, said tension members being secured in spaced relation and parallel to each other, with a pair of torque arms, both torque arms having free ends pivotally mounted'between said tension members and both torque arms being provided at their opposite ends with means for fixed securement to the yokes which carry the string insulators, and force multiplying means mounted between said insulating tension members and exerting a push on one of saidy torque arms to tilt the yokes which support the string insulators and relieve the strain on onev of said string insulators, the said force multiplying means being located outwardly of both torque arms so that the insulating tension membersv Autilize :the Lentire space between the torque arms `for insulatiomthe :said torque arms being formed latsaid opposite endswith aY-pair of lateralflanges separated by -a slot, `the said slot itting over and having its baseengaging thediagonaledge of the adjacent yoke, and means carried by the said sulators, a' Itorque .arm lcomprising :a .cast metal `lmember 4formed at .one of its .ends with a translversecylindrical formation having an axial apertureffserving as ,a bearing, the said torque arm tapering toward .said end vand .having a laterally turned enlargement at the other end,said laterally turned .enlargement being provided with a xslot separating `the enlargement into two parallel fianges, the slot being large enough to Areceive 'the edge of .a yoke, .and the extreme end of said laterally turned enlargement having its anges provided Vwith registering apertures, and an eye bolt having its shank in said apertures for engaging an opposing surface of a yoke When the base of a slot between said flanges engages vthe diagonal edge of saidv yoke.

. 8. In a .strain carrier for dead end strain insulators, a pair of parallel insulating tension members, a torque arm comprising a cast metal member formed vat one `of .its ends Iwith a transfverse cylindrical .formation having an .axial aperture serving as a bearing, the said torque arm tapering toward said end and having .a .laterally nection for said torque arm to said lpair of insulating tension members comprising an eye bolt passing through vboth tension kmembers and through said bearing apertureand provided with an eye nut on its end.

9. In a strain carrier fordead end strain ini sul'atOrS, a pair of parallel insulating tension members a torque arm comprising a cast `metal member formed at one of its ends with a transverse cylindrical formation having an axial aperture serving as a bearing, the said torque arm tapering toward said end and having a laterally turned enlargement at the other end, said laterally turned enlargement being provided with a slot separating the enlargement into two parallel flanges, the slot being large enough to receive the edge of a yoke, and the extreme end of said laterally turned enlargement having its flanges provided With registering apertures, and an eyebolt having its shank in said apertures for engaging an opposing surface of a yoke when the base of a slot between said flanges engages the diagonal edge of said yoke, and a pivotal connection for said torque arm to said pair of insulating tension members comprising an eye bolt passing through both vtension members and an eye nut on its end, and 4means for holding .said v insulating tension members in parallel spaeed relation, `comprising a U-.shaped stirrup having apertures for said eye bolt land havingits Alegs between .said insulating members. f

10. .In a strain carrier for d ead endstrain :insulators, a pair of parallel insulating .tension members, va torque arm comprising a cast-metal member formed .at one of yits .ends with ya transverse cylindrical formation havingxan axial an erture 'serving .as a bearing, ythe said torque arm tapering toward vsaid end and having Va laterally .turned enlargement vatklthe other end,` said.-1at verally turned lenlargementfbeing provided kwith a .slot :separating the enlargement into :two parallel flanges, `vthe slot bei-ng large enough4 to receive the `edge xof .a yoke, and theextremei'end of Asaid .laterally .turned enlargement havinglfits flanges provided `with .registering apertures, land an eye Abolt `having vits shank in said apertures 4fnrengaging yan opposing surface ofA a lyoke-when the :base of ra rslot lbetween .said anges engages the diagonal `edge of :said yoke, vand a pivotal ycunnection y'for said torque karm .t-o said pair ofjnsulating tensionzmembers comprising anr eyebolt lpassing through both tensionv members `and through .said bearing aperture,.and-,provi'dedfwith an eye .nut onits end, and means forholdingsaid insulatingtension members in parallelgspaced relation, comprising :a Ll-shaped stirrup yhaving apertures for. said eye bolt and lhaving -itslegs `between said .insulating members, said. stirrup having extensions at its yoke .extendedintaiapertures in each of said .insulating tension'inembers. v.

11. a strain carrier for :dead A.end strain 1nsu'lators, a vpair of :parallel insulating tension members, a torque varm comprising a rcastfrnetal 'member formed :at one of its ends with a transverse :cylindrical formation having an .axial aperture serving .as a bearing, thesaid torque arm tapering toward said end and having a .laterally .turned enlargement lat the y.other end, said dat- Yerally turned enlargement .being `provided with a slot separating the enlargementinto twopa'rfallel flanges, theslot being large enough tri-reiceive 'the Iedge of a yoke, andthe extreme' fend .fof said laterally turned enlargement having nits flanges provided withregistering aperturesnand .an eye bolt `having ,its shank `'in :said vaperti-tres for Lengaging 'an opposing surface of a yokewhen the base of a slot between said nflanges :engages the diagonal edge of said yokeiandaipivotal oonnectionfor said torque armtto said `,pair of :lnsulating tension yn'rembers comprising .an veye -boit passing through both tension membersrland through said bearing aperture, and provided with an eye nut on its end, each of said insulating tension members being re-enforced by an exterior plate having an aperture for said eye bolt, and each plate having transverse flanges engaging the edges of said insulating tension members.

12. In a strain carrier for a string insulator carried by a pair of yokes, a pair of torque arms, each torque arm having at one end means for fixed securement to one of said yokes, and each torque arm being `provided at its other end with a bearing bore, a pair of elongated insulating tension members and means for securing said insulating members in spaced relation to each other, means for pivotally attaching the bearing of one torque arm. between said insulating members, and means for exerting a force on the bearing end of the other torque varm when located between said insulating members at the opposite end of said insulating members, said latter means comprising a jack screw threadedly mounted between said insulating members outwardly of said latter torque arm, and having means for engagement with said bearing end, and said latter means comprising, a slider having spaced anges for sliding engagement with said insulating members and having a trough for engagement with a suitable shaft in said bearing end.

13. In a strain carrier for dead end strain insulators, a torque arm comprising a cast metal member formed at one of its ends with a transverse cylindrical formation having an axial aperture serving as a bearing', the said torque arm tapering toward said end and having a laterally turned enlargement at the other end, said laterally turned enlargement being provided with a slot separating the enlargement into two parallel flanges, `the slot being large enough to receive the edge of a yoke, and the extreme end of said laterally turned enlargement having its ilanges provided with registering apertures, and an eye bolt having its shank in said apertures for engaging an opposing surface of a yoke when the base of a slot between said flanges engages the diagonal edge of said yoke, the said torque arm being provided with a pair of spaced, depending, open eye members carrying a pair of elongated rods serving as a cradle for the strain insulator.

14. In a prying torque lever for relieving the strain on one of a pair of string insulators, while transferring the load to the other string insulator, said string insulators being mounted on a yoke, comprising an elongated lever having a bearing surface on its lower side for engaging a part carried by the yoke, adjacent the end 'of the yoke and adjacent the end of the loaded string insulator, said lever having a pair of flanges separated by a longitudinally extending slot for receiving said yoke, and said flanges carrying a prying bolt passing through two registering apertures in the iianges, said bolt exerting a prying force on a part of the yoke which is spaced from said loaded string insulator, said bolt passing through an aperture in the yoke and engaging the side of said aperture, and said anges carrying -a pivotally mounted adapter which is swingable into engagement with the top of the yoke above the lowered string insulator, for exerting a prying action through the intermediary of said adapter.

15. An elongated insulated tension assembly comprising a pair of elongated rectangular wooden strips, the said wooden strips being secured together by transverse threaded members adjacent each of their ends in parallel relation to each other, a cross head carried by one of said transverse threaded members, and having a threaded member in said cross head, a screw jack having a threaded bolt mounted in said latter threaded member, and a slider acted on by said latter threaded bolt by pushing action to cause an effective shortening of the space between the slider and the other end of the tension assembly, to place a tension on said wooden members.

16. An elongated insulated tension assembly comprising a pair of elongated rectangular wooden strips, the said wooden strips being secured together by transverse threaded members adjacent each of their ends in parallel relation to each other, a cross head carried by one of said transverse threaded members, and having a threaded member in said cross head. a screw jack having a threaded bolt mounted in said latter threaded member, and a slider acted on by said latter threaded bolt by pushing action to cause an effective shortening of the space between the slider and the other end of the tension assembly, to place a tension on said wooden members, said wooden members being provided with a multiplicity of of apertures' adjacent said other end.

17. In a tension insulating member, the combination of a pair of elongated wooden insulating strips of rectangular cross section with means for pivotally mounting a torque arm on one of said strips, and a second torque arm pivotally carried by the other end of said strips, said second torque arm being carried by a transverse eye bolt, each of said strips being provided with pairs of registering apertures, and the eye bolt passing through one set of registering apertures, and a spacer member between said strips, said spacer member having a spacing yoke and a pair of engaging anges, said flanges having lugs for engaging in the other registering apertures, and said flanges having apertures for passing said eye bolt.

DAVID CHARLES HUBBARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,319,587 Conrad May 18, 1943 FOREIGN PATENTS Number Country Date 23,908 Australia Aug. 3, 1936 363,952 Great Britain Dec. 31, 1931

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