US2087384A - Cable connecter - Google Patents

Description

July 20,` 1937. M LEE CABLE CONNECTER Filed July 9, 1935 'she'ets-sheet 1 INVENTOR.

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5 Sheets-Sheet 2 July 20, 1937. M. LEE

' CABLE CONNECTER *Filed July 9. 1935 July 20,1937. M. LEE 2,087,384

CABLE CONNECTER Filed July 9, 1935 s sheets-sheet s INVENIOR. Mdr n 17 L e Wem@ A TToRNEYs July 20, 1937.

l M. LEEI CABLE CONNECTER Filed Julvy 9), 1935 5 Sheets-Sheet 4 A lgvVENToR. Mary! n L @e E@ am ZZ Q A TTORN EY S July 20, 1937. M. LEE

" CABLE CONNECTER Filed July 9, 1935 5 Sheets-Sheet 5 INVENToR. Mam/f? L @e ATTORNEYS Patented July 20, 1937 UNITED STATES 2,087,384 CABLE CONNECTER Marvin Lee, Bye, N. Y., assigner to Burndy Engineering Co., Inc., New York, N. Y., a corporation of New York Applicatlonluly 9, 1935, Serial No. 30,425

4 Claims.

The present invention relates to a cable connecter of the type adapted for use with insulated cables Aand which has a fully insulated body portion as well as branch portions to which connections may be made and the resulting junctions subsequently insulated.

'Ihe main object of my invention is to provide a cable connecter device of the character indicated which renders it possible to connect insulated cables by the simple expedient of removing a small amount of insulation and then, after placing the one or more cable ends in position in the device, tightening up clamping nuts by means of a wrench or pair of pliers, or connections can be made by means of pressure devices, by soldering, brazing or by any other means known in the art.

Another object is to provide such a cable connecter which is not only well insulated electrically upon the body and branch portions thereof, but capable of withstanding mechanical abuse vwhile retaining its insulation wholly intact.

A further object is to provide a cable connecter of this type to which various numbers and ldifferent sizes of cables can be quickly connected or disconnected and changed, and from which all cable ends can -be speedily removed yand the connecter device returned to stock for future use or removed to a different location.

Yet another object is to have a cable connecter of a. size and form whic vinherently embodies such a generous current c rying capacity as to preclude any disruption or melting of any portion thereof from the effects of sudden and heavy current surges and short circuits which are possible in underground cable networks and systems.

It is, withal, an object of my invention to provide a connecting device for insulated cables which is itself easy to manufacture, reasonable in cost, highly efficient in design, extremely useful and labor saving and thus economical in practice and very compact and accessible in structure.

Further objects and the various advantages inmy invention will appear more fully in detail as this specification proceeds.

In the accompanying drawings forming part hereof, l

Fig. 1 is a perspective view of a cable connecter made according to the present invention and embodying the main principles thereof.

Fig. 2 is a plan View oi' the same with portions in section to disclose the interior construction and relations of parts.

Fig. 3 is an end view of the same cable con@ necter.

Fig. 4 is a plan view of a modification shown partly in section and having a portion omitted Fig. 9 illustrates a simplied form of conical sleeve adapted for use with the device of the fore-l going views.

Flg. 10 illustrates a diiierent form of connecter, the main body having the form of a toroid or Fig. 1l is a modification of the connecter of Fig. 10.

Fig. 12 is a fragmentary view of a clamped cable connection for one of the arms or branchesof the connecter.

Fig. 13 is a further form of cable connection having similar functions to that of Fig. 12.

Throughout the views, the same reference numerals indicate the same or like parts.

The making of safe and proper underground connections of service cables to feeder -cables has always been a laborious, hazardous and time consuming operation, requiring skill and experience, and forming a considerable item of expense in the laying and maintenance of power lines and rendering service from the same. Heretofore, when connecting multiple service taps or cables to an underground feeder cable, various methods and means have been resorted to in practice. Such methods and means have for the most part formed mere expedients,-some of which may be mentioned as follows.

One method has been to attach and solder each tap or service cable to the feeder cable after which the soldered joint was wrapped with several layers of insulating tape and friction tape.

Another expedient has been to use a gasketed metal junction box equipped with cable lugs for the copper portion of the feeder cable and wiping nipples for making wiped joints between the lead sheaths of the cables and thel junction box.

Another method has been to employ an insulated so-called crab splice", which consists of a group of joined short lengths of cable to the end's oi which the feeder cable and the taps or service cables are connected by means of soldered cable sleeves.

In the past, cables were universally oi' the lead Lately 'the old types of cables are being displaced by non-leaded types such as, for example, the parkway type, the latter having an exterior fabric insulation over rubber and the like and being lighter and more easy to handle `than lead sheath cable. With the parkway cable it is now usual to use non-leaded service cables which are 'Whenever wrapping with tape is required in order to provide the insulation, the foregoing methods not only occupy much time, skill and material, particularly the 'iF-connections but especially with reference to ysuch connections, as well as some others, experience has proven that it is difficult to prevent voids in the taping which are highly undesirable.

In view of the difliculties heretofore encountered in practice, including those just mentioned as well as with the foregoing objects in view, it is now proposed that by means of the present invention it will be possible to join tap or servmy ice cables with feeder cables in underground locations by an exceedingly simple method of i'orming joints in which only a wrench or pair of pliers will form the tools required for making the connections and which joints will merely recuire tobe directly taped 'over upon very limited areas in a speedy and emcient manner.

ience, in the practice of my invention a typical cable connecter embodying the same is indicated at Fig. l, consisting or" a main body portion of metal such as copper, bronze or any suitable electrically conductive alloy and a plurality of integral branches or arms 13, 5, It, il, etc. over which. a protective insulating envelope or form 5 P' or coated, which envelope may be l or soft rubber, gutta perche, a phenol condensam tion product or vinylite resin derivative, or other plastic or non-plastic hard soit .insulating body which is now used or be discovered to be efficient for the purpose ci' insulating 'the metal body and arms.

When the cable connecter is manufactured and brought out upon the market ior use is intended that the exteriorly threaded ends "E ci the arms are to be covered by caps similar to l of insulating material continuous with the envelope 5 so that the connecter is wholly protected irom exposure to the air or any atmospheric influences for a reason which will presently appear. When it is desired to use the device and make a connection thereto, naturally the threaded end of each arm to which a connection is to be made should have the insulating cap 'i removed therefrom. For this purpose, at approximately the inner end of the thread upon end 6 of each arm is an exterior line or mark i1 which may be a slight rib or indentation or any other kind of indication for the purpose of locating the exact point at which a knife may be brought down through the insulation to the metal of the arm, after which it will be easily possible to remove the cap thus severed from the main. portion of the form, or envelope 5. I

As already intimated, the ends 0I the s112115 may aast/eea be threaded, while interiorly said arms are formed into taper cups as indicated at il adapted to receive conical expansion and compression sleeves such as shown at d and ill, while the e1;- teriorly threaded portions of the ends oi the arms are adapted to receive interiorly threaded sleeve adjusting nuts Si, li. Said threaded ad justing nuts are adapted to0 engage against the outer ends of the tapered sleeves so as to force the same home into the tapered cups in the ends of the arms, and in order to allow for compression of the sleeves in accordance with the posi tions into which they may be forced by the threaded adjusting nuts, the mentioned sleeves are preferably partly slotted from their opposite ends as indicated at l2, i2, I3, whileadjacent to the outer end of each sleeve, a reduced portion or recess i4 is formed in order to render the outer end resiliently compressible in a manner corresponding to the smaller inner end of the sleeve.

The main purpose of each tapered cup and corresponding conical sleeve, as Well as adjusting nut, is to provide a connection between the end i5 of a cable I6, which may be of the lead sheath type or of the parkway type, which is indicated lig, i in partly disassembled form in the upper .right portion of the view. The end I5 of the cable is first 'freed from its insulation, and after being scraped clean is passed through the adjustment nut il and into tapered sleeve il and then the sleeve, together with the cable, is pushed into tapered cup d in threaded .end 6 of arm 3 and the adjusting nut engaged upon the threaded end d and screwed up upon the same until the conical sleeve about cable end i5 binds in the tapered cup and upon said end i5 of the cable, with a resulting great resistance to further turnoi the adjusting nut. it this juncture a pair of pliers or a fitillson wrench may be used to give the adjusting nut one er more extra turns until it is virtually impossible to screw the same in further upon threaded portion when it will be 'found that the cable is so securely held and locked Within the sleeve and cup that it will be impossible pull the same i'ree from the connecter.

usualh arrangement according to the :drst e invention is shown in Figs. l, and 3 connections made in the process ade gli,

' ,"P being a current supplying ble, while smaller cables l5, and are individual taps or service cables leading 'to local buildings or street lights. course,

those arms or branches which are not required to caused at the time the connecter is installed are untouched and remain'ln reserve for future connections if and when it is desired to expand the service and distribution of current, the caps l', J remaining unsevered in place upon the threaded ends of such unused arms and continuing to wholly enclose and thus insulate the same effectively while incidentally protecting them from air, gases, dampness or even accumulations of Water containing various impurities such as sewage, acids or salts, etc., which sometimes are found to have seeped into the manholes or underground locations where the cables are connected.

Due to the fact that the core 23 of cable 2U is smaller than cores l5 and 22 of cables i6 and i9 respectively, a correspondingly heavier sleeve i0 is used rather than the lighter sleeve B, for example, so that while the exterior conical dimensions of these sleeves may be the same, their manner just described, the ff internal diameters are selected to correspond with the particular size of cable to be connected to the device. Alternatively, it is also practical to have larger sleeves such as 25 to fit tapered cups similar to 26, winch may be larger than cups 6 previously described inasmuch as arms 4, 4, adapted for connection to feeder cables |8, I8 are preferably of greater transverse dimensions than arms 3, 3 used for service connections. In such a larger sleeve 25, the internal diameter is, of course, properly adjusted to the size of the conducting core 24 of the feeder cable |8 in each case, and as different sizes of feeder cables may be encountered in practice, even the larger type of conical sleeves may have di'erent internal diameters to correspond, although the exterior adjusting nuts 2| for securing the sleeves may be the same.

'I'he maini metal body or core 2 of the connecter is given a suiiicient cross section to enable the same to carry at least as much current as the largest feeder cable without heating, and when the various cables have been connected in the manner thus far shown and'described, the

connections are not only mechanically strong and secure but also eiicient and ample electrically, so that dangerous heating will not occur, even upon short circuit. Nevertheless, it is immediately apparent that in the case of each cable, the core thereof is practically concealed within the sleeve and connecter arm to which it is connected and the initially exposed threaded end also concealed and protected by a sleeve adjusting nut or 2|, as the case may be, which is of such dimensions as to substantially 'cover the entire thread upon which it may be screwed.

The resultl is that at each connection practically the only metal exposed is the sleeve adjusting nut interposed between the insulation of the cable involved and the insulating form or envelope upon the connecter arm to which it is connected, the area of the metal thus exposed being very limited and not only symmetrical, but the adjusting nut is also of a diameter which is intermediate that of the insulation upon the connecter'arm and that of the cable. Hence, it is but a simple matter to apply insulation tape upon the exposed adjusting nut, allowing the tape to overlap upon the insulation at both ends, and then wind friction tape over the first tape so as to result in a fully taped connection as indicated at 21 in Figs. 1 and 3. Instead of taping the connection, a rubber sheath may be used if desired, the same having, 'of course, been drawn in upon the cable before the end thereof was inserted into the connecter.

In the form of connecter just described the cables were all disposed in the same plane and either in line or running in parallel directions. Another form of connecter embodying the same general principles is shown in Figs. 4 and 5 generally indicated by 28 and having a conductive metal core or body 28 with branches or arms 30, 38, etc., which are staggered from thedopposite sides, while the ends are also fornied to serve as connecting means as at 3|, the metal core in this case being covered by a molded insulating form or body 32, which is preferably of a phenol condensation product or ebonite etc. In this form of connecter the insulation does not extend further than the beginning of the threaded portions upon ends 33, 33 of the arms 30, 38, etc., and upon said threaded ends knurled caps similar to 34, also made of a phenol condensation product, ebonite or the like are screwed,

while in` each case a waterproof insulating gasket of rubber or other suitable material may be interposed as at 35 between the cap and the insulation upon the arm. 30 so that the interior tapered cup 36, as well as the exterior thread itself of the end 33 of each arm will be fully protected against any type of exposure and possible leakage of current or short circuit. The same construction holds true for each of ends 3| of the connecter except that the threaded end 31 may be larger in cross section than arms 30 so that the conical cup 38 may be larger than the conical cups 36. In this form of connecter the feeder cable I8 may have its core 24 extending into slotted conical sleeve 38, which fits into conical cup 38 as in the case of conical sleeve 25 in the conical cup of threaded end 26 of the ilrst connecter.

The service cable I9 has its core 22 extending into slotted conical sleeve 48, which is in every respect similar to conical sleeve 9 before described and ts in one of the cups 36 in arm 38, while an adjusting nut 4| is screwed in threaded end 33 of said arm so as to retain sleeve 40 in compressed condition in the conical cup. The larger sleeve 39 of conical cup 38 of connecter end 3| preferably has a larger adjusting nut 42 which retains said sleeve in its cup and thereby also retains core 24 of feeder cable 8 in piace.

It is, of course, evident that when it is desired to connect a cable to the arms or the ends of connecter 28 it is but necessary to first remove the insulating cap 34 in each case, as well as the insulating gasket 35 when the threaded end 33 and its interior conical cup 36 vwill be immediately exposed to view, and it will then merely be necessary to strip suflicient insulation from the end of the cable to be connected and the core thus exposed scraped clean and inserted first through an adjusting nut 4| and. then into a sleeve similar to 48 and said sleeve and cable core inserted into a conical cup 36 and the adjusting nut screwed in upon threaded end 33. It is, of course, understond that in any case the adjusting nut may be initially screwed by hand until the cable is fast in preliminary manner when it is but necessary to screw the nut home by means of a `wrench or a pair of properly shaped pliers. In order to afford a better grip for the pliers or the Wrench the adjusting nut may be hexagonal or square as particularly shown in Fig. 5 at 4| and 42 and in order to protect the end of the insulation of the cables in each case the adiusting nuts may be provided with end recesses 43, 44 respectively. After taping or covering the joint thus made with tape or a rubber sheath or the like the joint will be finished. and insulated and ready for service.

In the two figures of the connecter already de-` scribed, the arms to which the connections are made are integral with the main body portion of the connecter but this is, of course, not always necessary as it is possible, as even shown in Fig. 6, to have the metallic core or body 45, counterbored and tapped as indicated at 46 and 4'|re spectively, while said core is exteriorly protected `.by an insulating form 48 which may be of molded rubber or the like. Instead of providing this form of connecter which is generally indicated at 43 with any arms projecting from the core 45 the insulation 48 is built up into tubular projections as at 6|), 68, whose inner hollow portions 5| register with the counterbored portions 46 of the core and are, of course, concentric with the tapped holes 41. Each of the tubular insulation projections 68 is closed by a rubber plug similar to 52, 62, which may be held in place by tap or by any other desired means so as to protect the counterbored and threaded interior portions in core @5. When it is desired to malte cable connections to this form of connecter the rubber. plug 52 is in each case removed from the tubular insulation projection 50 and a special metallic connecting arm 53 having a 'threaded inner end screwed into a tapped hole il by means of a wrench or pliers applied to the exterior square or hexagonal portion 55.

En order to render the contact between the connecting arm 53 and the bottom of the counterbored portion 46 of core 45 most secure a lock washer 56 is interposed between the main body portion of the arm and the bottom of the mentioned counterbored portion. .in this form of arm the outer end thereof is interiorly threaded as at l, while within said threaded portion a conical cup 58 formed and adapted to receive a slotted conical sleeve 59 in a manner which is analagous to the introduction of the conical sleeves in the cups of the rigid integral arms previously described. In the present case the main connection between the arm 53 and metal core 45 is the threaded inner end 54 of the arm, part of the current being, of course, also passed through the lock washer 56 which may be of any known form so as to prevent unscrewing of the arm 53. In order to securethe cable core 24 in sleeve 59 and also in conical cup 58, an extericrly threaded adjusting nut 60 is passed in upon the cable core 2li and then the core inserted into conical sleeve 59, after which the sleeve cable core may be inserted into cup 53 of the connecting arm and adjusting nut 60 screwed into threaded portion by means of a wrench or pliers fitted upon its square or hexagonal exterior. The exposed hexagonal or square 'portion 55 of the connecting arm as well as adjusting nut 66 are nally covered as before by means of taping or a rubber sheath, etc., and the connection is. quite iinished. ready for service.

A `further of the connecter which conibines features of the preceding forms iS shown generally indicated at in Fig. 6, wherein the nain core which. is oi copper, bronze or conducting or alloy is protected by an insulating envelope or form G3 preferably of soit rubber or the like and has not only the counterbored and threaded portions @d and E5 which resemble counterbored and tapped portions l5 and 41 respectively oi the connecter shown in -Fig 5 but also has the ends 66 drilled and tapped as indicated at 61, while the insulation is provided with hollow tubular projections 58, 66 at the proper locations for connecting arms to be inserted, and at the ends with 'tubular extensions t9, 69. The tubular projections 68 are initially tted by composition plugs similar to 10, which are provided with inner threaded ends 1I screwed into the tapped holes 65, while the tubular end extensions 69 are similarly closed by plugs as at 1I, screwed into the tapped holes 61 at each end.

When a connection is to be made to the present form of connecter, the plug is unscrewed and a special connecting arm 12 provided with an inner threaded end 13 is screwed into the tapped hole 65, a lock washer 14 of'metal being vinterposed between the main body portion of arm 12 and the bottom of the counterbored portion of core 52. The arm is, of course, screwed in tightly with the aid of a wrench or pliers so that it will be securely locked in place by means of the threaded end thereof and the lock washer. The

end of the connecting arm is interiorly threadaccesos ed as before and within said threaded end the rin is provided with a conical cup 16 into which a slotted conical sleeve 11 will t when the core 222 of the service cable i9 is inserted therein after an exteriorly threaded adjusting nut 18 has rst been placed in position upon said cable core. When the adjusting nut is screwed down into threaded end 15 of arm 12, service cable I9 is, of course, well connected to metal core 62 through connecting arm 12.

At either end 66 of the connecter a special feeder cable arm 19 provided with an inner threaded end 80 is screwed into tapped hole 61, while a lock washer 8l is interposed between the main body portion of arm 19 and the end 66 proper of the connecter core. The'interiorly threaded outer end 82 of arm 19 is adapted to receive the threaded portion of a sleeve adjusting nut 83, through which the core 24 of feeder cable i8 may be passed, while the arm is formed into a conical cup 84 for receiving a slotted conical sleeve 85 upon said cable core. When the adjusting nut is screwed into the threaded end 82 of the arm so that sleeve 86 binds within cup 84 upon cable core 24 the connection is, of course, mechanically completed. Taping or covering the exposed metal portions of the connecting arms and adjusting nuts by means of tape or rubber sleeves or the like will naturally finish the connections for service.

While the slotted conical sleeves have been shown provided with exterior channels or reduced portions immediately -within their larger ends this, of course, is not intended to form a limitation herein nor is it necessaryto have as many opposed spaced slots or cuts extending inwardly from the ends of the sleeve as shown, for example, in Fig. l, for merely two slots or perhaps three or four slots such as indicated at 36 and 81 upon a conical sleeve 88 may be suicient in some cases, the exterior channel being wholly omitted. Other forms of thesleeve may also be used, in tact, any similar structure already known in the art, which includes even split sleeves, etc.

La all the preceding forms of the connecter the core thereof has been inore'or .less straight with the branches or arms extending from one or both sides thereof but in Fig. Ll@ a connecter generally indicated at 89 has a toroid form of metal core at 50 having service connection arms similar to extending in various-directions from the periphery thereof while at the ends the pair of arms similar to 51 may project in opposite directions for receiving the ends of feeder cables. Each of the service connection arms 9i, when cleared of insulation, will have an exposed metal portion 92 through which the ends of the U-bolt 93 may be projected. A keeper 94 is preferably laid upon the cable core 95 of service cable 96 and the nuts i06, |06 tightened so as.to clamp down the bolt and keeper upon the cable in order to bring the latter into intimate contact with arm 92. The exposed metal portions may then be insulated as previously indicated for Vthe connecters already described hereinbefore.

The whole connecter is, of course, insulated as at 98 with any suitable material selected from the various soft or hard plastic groups and upon the arms 9| may at first extend in the form of caps 99 even over the ends of the latter, while indicating lines H10 locate the most advantageous points at which a knife may be used to sever the insulation from the useful portions of arms 92. The opposite arms similar to 91 for -the feeder cables i3 and H15 are, if desired, simply made hollow so as to receive the core lill., for example, which may be soldered into place within the arm so that the solder completely fills the same as at |02. The connections to the feeder cable arms may then be taped and otherwise insulated as indicated at |04 in any manner known' in the art.

A somewhat similar form or" connecter is also illustrated in Fig. 11 generally indicated at lill and primarily consisting of a core E08 in the formcf a disk of metal having feeder cable arms as generally indicated at ||3 and a plurality of peripherally disposed servicev cable connection arms as indicated at ||0, l|0, while over` the entire connecter is an. envelope or form of insulation |09 extending as in Fig. 10 over the ends of the smaller arms as at 99, 99'and having indicating lines thereon, if so desired. The feeder cables |03 and |05 may be connected as before and each of the connections taped or otherwise insulated as at |0I.

However, each of the service connection arms ||0 is capable of receiving the core 95 of the service cable 96 and a clamping plate lll secured to said arm by screws i2 so that the cable core 95 is securely clamped between arm |l0 and plate I l.' The exposed metal parts may then be taped over and insulated as already described and the connection is complete. Any of the service connection arms that are not required may naturally remain untouched with its insulation 99 in place until the connections are required to be made thereto.

Although in Figs. 10 and 11 the connecter h-as a practically circular periphery, the same could be elliptical or the connecter could be semi-circular in form instead of being a disk or could be U-shaped so as to include merely half of the toroid formfthe connecting arms being preferablyupon the convex portions thereof in any case. Similar modifications are also possible and may be obvious to those skilled in the art.

As may be noted, the cross section of the metallic core'in the rst form ofthe connecter shown in Figs. 1 -to 3 may be more or less rectangular i or it may be square as, for example, in that form shown in Figs. 4, 5, 10 and 11, or it may be round or oval as in the forms of .connecter shown in Figs. 6, 'l and 8. While several modifications of the core and its arms, as well as of the adjusting nuts, 'and also other known forms of connectingV means have been shown, I am, of course, not limited to the specic details disclosed herein as further modications are naturally possible.

Hence,`other modifications and variations of my connecter may be resorted to and parts may be used Without others. Having now fully described my invention, I claim:

1. A multiple cable 'connecter for conducting current from main to branch conductors, comprising, a metallic bus bar of unitary construction for conducting the current and having a plurality of conductor-terminal attaching means integral therewith for engagement with separable conductor-terminal means in which the conductors are gripped; a molded insulating jacket formed into a one-piece permanent assembly en'- closing said bus bar and provided with separably attachable portions of insulation adjacent the conductor terminal attaching means for providing. access to the conductor-terminal attaching means, the separably attachable portions removvintegral therewith for engagement with separable conductor-terminal means in which the conductors are gripped; a molded insulating jacket formed into a one-piece permanent assembly completely enclosing said bus bar, except for a single aperture adjacent each conductor-terminal attaching means, through which apertures separably attachable portions of insulation are held in contact with the molded insulating jacket by threaded engagement with the conductor-terminal attaching means, the separably attachable portions removable when the separable conductor terminal means are attached to the bus bar and replaceable when the separable conductor terminal means are removed from the bus bar.

3. A multiple cable connecter for conducting current from main to branch conductors, comprising, a metallic bus bar of unitary construction for conducting the current and having a plurality of conductor-terminal attaching means integral therewith; a plurality of separable conductor-terminal means in which the conductors are gripped for engagement with the conductorterminal attaching means, said separable conductor terminal means comprising wedging conductor-gripping .means, extending conductor sockets, each threaded at one end for engagement with the conductor-terminal attaching means integral with the bus bar and threaded at the other end for engagement With a compression nut for compressingA the wedging conductor-gripping means into and securing the conductors to the extending conductor sockets; and a molded insulating jacket formed into a one-piece permanent assembly enclosing said bus bar and provided with separably attachable portions of insulation adjacent the conductor terminal attaching means for providing access to the conductorte'rminal' attaching means, the separably attachable portions removable when the separable conductor-terminal means are attached to the bus bar and replaceable when the separable conduc-V tor terminal means are removed from the bus bar.

4. A multiple cable connecter for conducting current from main to branch conductors, comprising, a metallic bus bar of unitary construction for conducting the current and havinga plurality of internally threaded openings each extending entirely through the bus bar and adaptedtq engage a separable conductor-terminal means at each end thereof in opposed relationshlp; a, molded insulating jacket formed into a one-piece permanent assembly enclosing said bus bar and provided with separably attachable portions of insulation adjacent the conductorterminal attaching means for providing access to the conductor terminal attaching means, the. separably attachable portions removable when the separable conductor-terminal means are attached to the bus bar and replaceable when the separable conductor-terminal means are removed from the bus bar.

MARVIN LEE.

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