CA1082322A - Method and device for enclosing a cable splice using foamed plastic material - Google Patents
Method and device for enclosing a cable splice using foamed plastic materialInfo
- Publication number
- CA1082322A CA1082322A CA270,179A CA270179A CA1082322A CA 1082322 A CA1082322 A CA 1082322A CA 270179 A CA270179 A CA 270179A CA 1082322 A CA1082322 A CA 1082322A
- Authority
- CA
- Canada
- Prior art keywords
- splice
- tubing
- foamed plastic
- enclosure
- cables
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/003—Filling materials, e.g. solid or fluid insulation
Landscapes
- Cable Accessories (AREA)
- Processing Of Terminals (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and device for providing an enclosure for a cable splice using compressible foamed plastic material tightly positioned about the cables and sheet material wrapped about the cable splice. liquid plastic, activated to form a rigid structure, is placed within the space formed by the sheet material and the compressible foamed plastic material.
Activated resin or plastic activated to foam may be used.
A rigid plastic enclosure is thereby formed. Means may be employed to restrict the expansion of the activated plastic in order that a denser foamed plastic enclosure may be pro-vided. Seals may also be employed along the rigid enclosure to prevent moisture intrusion along the cables. An inner enclosure about the cable splice may provide easy reentry.
A method and device for providing an enclosure for a cable splice using compressible foamed plastic material tightly positioned about the cables and sheet material wrapped about the cable splice. liquid plastic, activated to form a rigid structure, is placed within the space formed by the sheet material and the compressible foamed plastic material.
Activated resin or plastic activated to foam may be used.
A rigid plastic enclosure is thereby formed. Means may be employed to restrict the expansion of the activated plastic in order that a denser foamed plastic enclosure may be pro-vided. Seals may also be employed along the rigid enclosure to prevent moisture intrusion along the cables. An inner enclosure about the cable splice may provide easy reentry.
Description
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This invention is directed to a method and device for rigidly enclosing cable splices. ~ore speci~ically, this inven-tion is dixected to a method and device for provid-ing a rigid plastic enclosure about a cable splice where the materials used to encase the rigid plastic do not themselves necessarily provide substantial environmental closure pro-perties.
Cable splice enclosures have found increasing use in underground utility applications. These underground applica-tions need to be waterproof, impervious to insects, fungus and the like, and relatively strong. To meet these various stringent requirements, several types of cable splice enclo-sure systems have been devised. These systems generally employ a rigid outer structure filled with waterproof material. The waterproof fillers generally employed having included non-:. !
~` drying materials which are not miscible with water, powders, and resins which are cured in the enclosure. In the case of the nondrying materials and the powders, it is necessary to provide a rigid outer structure for structural support of the cable splice. Further, the outer structure is required, in such instances, to provide a continuing leakproof assembly to prevent erosion and infestation of the nonrigid waterproofing material enclosed therein. 9uch leakproof, rigid outer struct-ures require detailed assembly procedures including masking and ., taping the cables to either end of the structure, sealing the structure, and filling the structure with a waterproof compound.
Because of the required detailed assembly procedures, these final cable splice enclosures are generally expensive and may ~: be ineffective because of -the high probability of installer ~` 30 error.
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Where resins are employed for creating the moisture proof inner structure, other problems are encountered. The heat o~ the curing reaction may crack the curing resin and thereby reduce the rigidity and waterproof nature of the final structure. The use of resins also requires a substan-tial cure time~ normally about 45 minutes. During this cure, the ~ splice must be held absolutely still to prevent the creation - of passageways for water intrusion. Consequently, the use ~ of resins present~ a high probability of installer error and ; 10 also increases the cost of the splice enclosure. Further, if the outer casing is not made leakproof, the resin tends to leak quickly from the casing before it begins to cure. The casings employed with potted resin enclosures must, therefore, present a backup structure for the resin to insure a rigid and water-proof splice enclosure.
The present invention provides a novel system for enclosing a cable splice to provide a rigid and waterproof structure. The present system employs an outer structure or mold which need not substantially enhance the rigid and . i ~ 20 waterproof nature of the completed enclosure. The outer .. , . ~ .
~ structure is generally formed from compressible foamed ! , .. .
plastic members positioned about the cables away Erom the splice. Sheet material is positioned about the cable splice and is caused to be sealed with the foamed plastic material ~ ~
by its compressibility and resilience. The completed enclosure ~ .
includes a rigid plastic mass surrounding and dispursed within ~
the cable splice. This rigid plastic mass provides the struct- ~ -ural support and waterproof nature of the completed cable splice enclosure. Resins which have been activated to cure : :.
to a hard structure may be easily handled by such a temporary `~ mold. Activated plastic which foams to form a rigid structure .. . .
:: :
.
lQI 3232:2 may also be advantageously employed with these nonstructural outer cases or molds. The use o~ plastic activated to ~oam also provides, when complete, substantial thermal insulation to the splice. The flexible sheet material and the flexible foamed plastic ma-terial becomes unnecessary as structure or waterproofing components of the enclosure.
Several advantages are obtained by this unique structure and method. Because the foamed plastic material wrapped about the cables at the end or ends of the mold or case is compressible and resilient, the outer sheet may be quickly and easily forced around the foamed plastic to form a seal which will prevent leakage of resin or foaming plastic during formation of the inner structure. The assembly time for the splice enclosure is substantially reduced because the activated plastic forms within a few minutes! Ackivated resin closures may be left to cure without fear of leakage.
Further, when foaming plastic isused the foam tends to flow until it finally becomes rigid. Consequently, it is not necessary ii i `. to absolutely fix the splice during the curing of the plastic.
:...... ... 20 Because of the simplicity of the structure and the ability of the foam to e~pand into all cavities, the probability of in-. staller error is greatly reduced and any e.rrors in installation become immediately apparent or are overcome by the action of the foam. As a result, the overall cost of both labor and material is greatly reduced. Thus, the present invention .
provides substantial advantage over the heretofore employed nondrying and resin enclosure requiring a rigid case and seals `~. fabricated from mastic.and tape.
In accordance with one broad aspect, the invention relates to a cable splice enclosure comprising compressible ... .
.
foamed plastic wrapped about the cables and spaced from the .''' : ' ' .
., .
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splice; sh~et material positioned abou-t the splice and held against said flexible ~oamed plastic; a rigid foamed plastic structure filling the interior space defined by said sheet material and said flexible foamed plastic, and mastic rings positioned about the cables between the splice and said compressible foamed plastic, said rings extending into said rigid plastic structure to prevent the passage of moisture ~ ;
along the cables.
In accordance with another aspect, the invention relates to a method for forming a cable splice enclosure comprising positioning compressible material around and between the cables; positioning an enclosure abaut the cables and the splice so as to compress the compressible material to form a seal; filling said enclosure with a body of harden-able material which when hardened will ~orm a rigid structure about said splice, and placing rings of mastic about the cables between the cable splice and the compressible material.
; Accordingly, it is an object of the present invention I to provide an improved cable splice enclosure.
: 20 It is another object of the present invention to pro-vide a method for forming such cable splice enclosures~
It is a ~urther object of the present invention to `
provide an improved outer structure or mold ~or a plastic cable splice enclosure.
Further objects and advantages of the present inven-tion will become readily apparent ~rom the following detailed description and accompanying drawings.
Figure 1 is an exploded assembly of the present in-vention as it may be employed with a splice in a linear cable.
; 30 Figure 2 is a front view of an assembled cable splice enclosure of the present invention. This enclosure : `' ,.. ~"" ..
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is an assembled view of the enclosure of Figure 1 and has a sectioned portion for clarity.
Figure 3 is a ~ront view of an enclosure of the present invention as employed with a splice of two adjoining cables.
Figure 4 is a side view of the present invention as shown in Figure 3.
Figure 5 illustrates another embodiment of the ~-~ present invention which incorporates the use of resin.
Figure 6 illustrates an enclosure of the present invention which may be reentered at a later time.
Turning first to the embodiment shown in Figures 1 and 2, there is shown a splice 10 of cables 12 and 14. The ; splice is formed from incoming wires supplied by cables 12 and 14 which are individually connected through wire splices 16. ~ shield connector 18 is also provided. The splice 10, cables 12 and 14 and the shield connector 18 may all be of conventional design and construction.
The assembled cable splice is then enclosed by the cable splice enclosure. In this first embodiment, the cable splice enclosure comprises a flexible outer ~acket generally designated 20 which includes a flexible cover 22 and com-pressible end seals 24 and 26. When assembled, the jacket `
20 provides a closed internal space about the cable splice 10 and the ends of the cables 12 and 14.
The flexible cover 22 may most conveniently include a polyethylene tube. This polyethylene tube is folded in half to form a two-layer sheet 28 and tacked together along lines ~, 30 and 32. This tacking may be accomplished by running a heat-' 30 ed element along these lines. The rectangular sheet 28 there-by formed is flexible and can provide substantial tensile ';'' ~ - 6 _ .
.. . . , . . .:
... . . . . .. .
strength. The tacking along lines 30 and 32 is primarily for convenience. Ba~s 34 and 36 can ~e conveniently located be- ;
tween the tack lines and the folds of the tubing. The bars 34 and 36 when positioned in the edges o~ the rectangular sheet 28 provide a rigid structure for closing the jacket 20 ' about the splice 10. To hold the bars 34 and 36 together, slots 38 are provided through the bars 34 and 36. The slots 38 are aligned to receive fasteners 40. The fasteners 40 are preferably pointed at a first end to allow penetration of the polyethylene tubing at the slots 38. A thin section 42 is provided near the center of the fasteners 40 to allow ~ -rotation of the fasteners 40 in the slots 38. The broader ; end sections of the fasteners 40 are then unable to withdraw . . , ' from the bars 34 and 36. The bars 34 and 36 and the fasteners 40 are preferably of strong plastic or metal to resist the ~ ' tension forces placed in the flexible sheet 28 by the expand-ing foam described below. The number of fasteners 40 and `~
slots 38 depend on the rigidity of the bars 34 and 36, the ~;, expected pressure of the expanding foam placed within the . ~ .
jacket and the length of the enclosure.
The compressible end seals 24 and 26 are secured to the inner side of the flexible sheet 28 at either end thereof.
Epoxy or other bonding substances may be employed to ~ix the end seals onto the flexible sheet 28. The end seals 24 and ~1 26 are preferably of a compressible foamed plastic such as polyurethane or expanded neoprene which is also resilient in , . , order that the compressed material will expand to tightly seal against the cables and the enclosure. In order that the end I seals 24 and 26 do not interfere with the joining of the bars ;1 30 34 and 36, the end seals 24 and 26 need only extend to points , near the weld lines 30 and 32. It is advantageous that the height of each end seal 24 and 26 i5 such that when the bars 34 and 36 are joined, each end seal 24 and 26 will be compres-sed about the cables 12 and 14. The width of each end seal 24 and 26 is preferably such that the seal cannot be readily pushed over to allow escape of the expanding oam placed with-in the jacket. End seals having a width equal to twice the thickness have been found to be quite satisfactory.
These flexible and compressible foamed plastic end seals 24 and 26 replace the use of conventional mastic and tape. The resiliency and compressibility of the flexible end seals 24 and 26 make possible the easy assembly of the flexible plastic sheet ~8 and the spliced cables 12 and 14.
The conventional method for sealing open ends between a casting and spliced cables is to first apply mastic, force the casing over the mastic, add more mastic, and finally cover the entire area with tape. This procedure requires skill and quite a bit of time. Further, a good closure is not guaran-teed especially in cold weather when the mastic is not sticky.
The end seals 24 and 26 are not l`ntended to prevent moisture ;, ; 20 intrusion, but rather cooperate with the remainder of the enclosure system to deine the outer limits of the rigid oamed plastic later positioned ~ithin the enclosure.
Plastia 4~ is aativated to Eoam and is then poured into the jacket 20. The activated plastic is allowed to foam : :~
to fill the space formed by the jacket 20. The spliced cables may be placed in the jacket 20 either beore or after the activated plastic 44 is poured therein. After the plastic .:
~ 44 has been poured into the jacket 20, the bars 34 and 36 , :;
are brought ~ogether and held together by the fasteners 40.
The activated plastic 44 is then allowed to expand to fill the interior space. It is advantageous to place enough , . . .
., : .
, .
... .
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activated plastic 44 in the jacket 20 so that the resulting rigid foamed mass 46 will more than fill a space equal to the interior space of the jacket if allowed to ~reely expand. By using more plastic 44 than is required to just fill the jacket 20, the resulting density of the foam 46 will be greater. This ~
adds structural strength and reduces the chance of leakage. ~ -Further, it enhances the intrusion of the foam into the splice itself. Once the foamed mass 46 is cured, the jacket 20 is no longer required. However, it may be left on the enclosure -for convenience and for whatever added protectian it may pro- ~
vide. The time required for the rigid plastic mass 46 to ex- ~ ;
- pand and strengthen may be set for approximately 10 minutes.
This is far better than the 45 minutes which is often required for resin to cure and strengthen. Rigid polyurethane foam or an equal mixture of polyol and isocyanate can be use to form :,~! .
the mass 46.
I TQ enhance the density of the ri~id foamed plastic ~, 46 and to promote the intrusion of the foaming plastic 46 j into the splice 10, a porous pad 48 may be positioned within the jacket 20. The pad 48 may be a coarse, open-celled, foamed plastic structure such as used for air filters and the like.
This pad 48 is placed about the position where the cable splice 10 will be located in the iacket 20. The activated plastic 44 may then be poured over this pad 48 and the jacket 20 closed.
Because of the open-celled nature of the pad 48, the activated plastic 44 will permeate the pad and flow to the flexible sheet 28 of the jacket 20. When the jacket 20 is closed, the pad 48 -` will be bent around to meet itself and provide a semi-continuous support about the splice 10. The activated plastic 44 will expand about and within the pad 48.- The pad 48 will resist this expansion and thereby increase the final density of the ~` ' .
_ g _ ,, .
,.
~, ,-, , . ~ , ;: foamed plastic mass ~6. During expansion of the activated plastic 44, the .~oaminy substance i5 moved by khe foaming pressure within itself. Under the restraint of the pad 48, the foaming substance will be driven by itself into the cable splice 10 to ~ill all cavities. The pad 48 also provides some strength to -the enclosure.
. To facilitate the assembly of this enclosure, rigid, yet malleable spacers may be included. Only one such spacer 49 is shown; however, two spacers 49, one on each end, are suggested. The spacer 49 is divided at one end into two prongs.
These prongs are illustrated in Figure 1 before assembly. :~
During assembly of the enclosure, the pronged end of each of the spacers is bent around the cable as seen in ~igure 2.
Thus, the spacer will be maintained during assembly of the .
enclosure relative to the cable and splice. At the end op- .
posite the pronged end, a fastener 50 may be employed to attach the spacer to the bars 34 and 36. In this way, the : .
:~ spacer 49 wiLl maintain the bars 34 and 36 at a convenient : position relative to the cables 12 and 14. In order that .~ 20 the spacers will be easy to work with, they may be made con-: veniently from aluminum.
` To insure a proper seal along cables with pol.y-ethylene covers, mastic may be positioned in rings 51 and :
52 about the cables 12 and 14 on either side of the splice 10.
..~., - These mastic rings 51 and 52 are positioned so that they will .~l be within the foamed plastic mass 46. The mastic used may be .' any one of the commercially available mastics such as uncured butyl rubber. The mastic rings 51 and 52 tend to adhere well to the rigid foamed plastic mass 46 and also to the polyethylene : 30 cover on the cables 12 and 14. A barrier is thereby provided - :~
.. which prevents moi.sture intrusion between the rigid foamed . plastic mass 46 and the cables 12 and 14.
.: . .
-- 10 -- , , ~3Z3~2 This first embodiment may also be canstructed to allow reentry into the splice. Such a configuration is il-lustrated in Figure 6 and includes a flexible plastic s~leet 54 wrapped about the splice 10 and held at either end by rub-ber bands 56 or the like. Two rip wires 58 are then positioned on either side of the cable splice 10. These rip wires may be of 20 gauge stainless steel wire. Stainless steel is sug-gested because of its longevity in underground environments, ~ -The rip wires 58 may be held down by the rubber bands 56. The rip wires 58 also extend through the mastic rings 50 and 52 to prevent leakage along the rip wires 58. The enclosure may then be assembled in a conventional manner. When reentry is , required, the jacket 22 can be removed and the rip wires 58 drawn through the rigid foamed plastic mass 46. The inner wrapping 5~ is then exposed and can be easily removed to gain access to the splice. The rip wires shown in Figure 6 are displaced from the sheet material 54 for clarity. However, it is preferred that the wires lie directly on the sheet mate-rial 54 in order that all of the rigid foamed plastic material 46 may be cut.
' A second, less complicated jacket may be employed ~' ....
;; with a cable splice which connects two adjacent cables as ;; illustrated in Figures 3 and 4. Two cables 60 and 62 extend to a splice 64. A shield connector and clamp 66 connects the two cables 60 and 62 together. Such a splice may be used in an underground cable line where each end of the cables to s,::
, be spliced can be brought together as shown in Figures 3 and s", 4.
~ i ~,~ The cables 60 and 62 are wrapped with the compress-ible foamed plastic material used in seals 24 and 26. A seal ;~ 68 is thereby provided. The compressible foamed plastic .
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material is preferably placed between the cables 60 and 62 as well as around these cables to form an adequate seal, -the material thus being generally in the form of a figure eight. A flexible plastic tube 70 is positioned over the splice 64 and is gathered at the seal 68. A conventional tie strip 72 is then placed abou-t the seal 68 and the gathered tube 70. A seal is thereby formed between the tube 70 and the cables 60 and 62. This seal is not impervious to water but provides a strong seal to prevent the flow of the foaming plastic material along the cables.
A plastic sack 74 is also incorporated with this enclosure. The plastic sack 74 and the tubing 70 may both be of polyethylene film. The sack 74 and the tubing 70 are conveniently of the same expanded diameter in order that the ` tubing 70 and the sack 74 will both come to resist radial expansion of the foam at the same time. As with the first embodiment, the tubing 70 and the sack 74 primarily operate as a mold for the rigid foamed plastic which is expanded in the enclosure.
With the seal 68 completed, activated plastic is poured into the interior of the tubing 70. The plastic is not shown for clarity. The tubing 70 is then folded over at 75 and the sack 7~ is positioned ove~ the assembly. The sack 74 is pulled all the way down to the fold 75 in the tubing 70.
As the activated plastic begins to foam, it will initially expand to meet the tubing 70 and the sack 74 at the lower end ., of the enclosure near the seal 68. When the foam begins to exert pressure against the inner sides of the tubing 70 and the concentrically arranged sack 74, the sack will be held by ,: . . . .
friction rom-slipping upward and off of the tubing 70. The expanding foam is then forced upward by the lateral constraint . . : ~ . . .
. .
of the tubing 70 and the sack 74. The foam will eventually rise to the fold 75 in the tubing 70 and begin to force the fold out of the tubing 70. This unfolding of the tubing 70 is resisted because ~he ~olded portion of the tubing 70 is - held between the lower portion of the tubing 70 and the side of the sack 74. The foam is also exerting radial pressure against the inner side of the tubing 70 which acts to hold the fold in place and keep the plastic sack 74 down on the tubing 70. Vent holes 76 are provided at the top of the plastic sack 74 in order that gas pressure cannot build up in the sack 74 and prematurely force it off the tubing 70. The cooperation of the tubing 70 and the sack 74 to hold the fold in the tubing ~' 70 and to hold the sack down on the tubing causes the rigid foam to expand within a constrained volume. This acts to in-crease the density of the foam for greater strength and im-penetrability. The expanded enclosure is shown in phantom in ;
Figures 3 and 4. In some cases it may not be necessary to employ the sack 74; the tubing alone being sufficient to form the splice enclosure. This is especially true ~here activated resin rather than foaming plastic is poured into the tubing 70.
;~ As with the embodiment illustrated in Figure l, a ., porous pad 78 may be employed to further increase the density of the foam, cause the foaming material to penetrate the splice , 64, and strengthen the overall enclosure structure. The pad ,. I .
78 is preferably provided with a hole at 80 and is positioned ~' over the cable ends 60 and 62. The mesh pad 78 may be posi-.", tioned before the splice 64 is made. When the pad 78 is ,. ,~
positioned first, a smaller hole or holes are required in the center of the pad 78.
, ,-1 `~ 30 A bead of mastic may also be employed about the ' : ,, cables 60 and 62 near the seal 68. The mastic adheres well ,~, .
'.,' .
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to the polyethylene covers on the cables 60 and 62 and becomes embedded in the resulting rigid foamed plastic enclosure.
The mastic thereby prevents wa-ter intrusion at the inner face between the cables 60 and 62 and the r;gid foamed plastic mass.
- A third embodiment is illustrated in ~igure 5. Again, -a seal 84 is formed about the cables 86 and 88 by threading a piece of flexible, compressible, foamed plastic material around the cables 86 and 88. The cable and seals are then jammed into the hole located at 90 in the pliable plastic ` enclosure 92. Resin 94 may then be poured into the enclosure 92 and allowed to cure. In this application, a conduit 96 is shown extending upward about the splices 98 and 100 to meet cables 102 and 104.
on all three embodiments, a seal is provided about the cables which is designed to prevent the flow of the internal sealing material and is not specifically designed to prevent moisture intrusion. Further, the jackets and outer ` enclosures act primarily as molds for the placement of foaming plastics or resin. In the first two embodiments, these molds further operate to constrain the expansion of the foaming plastic to increase the final density of the ri~id Eoamed plastic mass which forms the cable splice enclosure. Thus, in the present invention, the outer casing or jacket structure may be of inexpensive and easily worked materials. The inner ~ ;
structure formed by the foamed plastic provides the structural ~;l rigidity and imperviousness necessary for underground cable splice enclosures. Once the splice is completed, the enclosure , in all instances may be quickly and easily provided and the -foam added and cured in substantially less time than it takes for the resin in conventional enclosures to cure.
-- .
i~ - 14 -lO~Z322 While embodiments and applications of this inven-tion have been shown and described, it would be apparent to those skilled in the art that many more modifications are possible withou-t departing from the inventive concepts herein described. The invention, there~ore, is not ~o be restricted :~
except by the spirit of the appended claims.
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This invention is directed to a method and device for rigidly enclosing cable splices. ~ore speci~ically, this inven-tion is dixected to a method and device for provid-ing a rigid plastic enclosure about a cable splice where the materials used to encase the rigid plastic do not themselves necessarily provide substantial environmental closure pro-perties.
Cable splice enclosures have found increasing use in underground utility applications. These underground applica-tions need to be waterproof, impervious to insects, fungus and the like, and relatively strong. To meet these various stringent requirements, several types of cable splice enclo-sure systems have been devised. These systems generally employ a rigid outer structure filled with waterproof material. The waterproof fillers generally employed having included non-:. !
~` drying materials which are not miscible with water, powders, and resins which are cured in the enclosure. In the case of the nondrying materials and the powders, it is necessary to provide a rigid outer structure for structural support of the cable splice. Further, the outer structure is required, in such instances, to provide a continuing leakproof assembly to prevent erosion and infestation of the nonrigid waterproofing material enclosed therein. 9uch leakproof, rigid outer struct-ures require detailed assembly procedures including masking and ., taping the cables to either end of the structure, sealing the structure, and filling the structure with a waterproof compound.
Because of the required detailed assembly procedures, these final cable splice enclosures are generally expensive and may ~: be ineffective because of -the high probability of installer ~` 30 error.
';. ' ' `
~8Z322 ,~
Where resins are employed for creating the moisture proof inner structure, other problems are encountered. The heat o~ the curing reaction may crack the curing resin and thereby reduce the rigidity and waterproof nature of the final structure. The use of resins also requires a substan-tial cure time~ normally about 45 minutes. During this cure, the ~ splice must be held absolutely still to prevent the creation - of passageways for water intrusion. Consequently, the use ~ of resins present~ a high probability of installer error and ; 10 also increases the cost of the splice enclosure. Further, if the outer casing is not made leakproof, the resin tends to leak quickly from the casing before it begins to cure. The casings employed with potted resin enclosures must, therefore, present a backup structure for the resin to insure a rigid and water-proof splice enclosure.
The present invention provides a novel system for enclosing a cable splice to provide a rigid and waterproof structure. The present system employs an outer structure or mold which need not substantially enhance the rigid and . i ~ 20 waterproof nature of the completed enclosure. The outer .. , . ~ .
~ structure is generally formed from compressible foamed ! , .. .
plastic members positioned about the cables away Erom the splice. Sheet material is positioned about the cable splice and is caused to be sealed with the foamed plastic material ~ ~
by its compressibility and resilience. The completed enclosure ~ .
includes a rigid plastic mass surrounding and dispursed within ~
the cable splice. This rigid plastic mass provides the struct- ~ -ural support and waterproof nature of the completed cable splice enclosure. Resins which have been activated to cure : :.
to a hard structure may be easily handled by such a temporary `~ mold. Activated plastic which foams to form a rigid structure .. . .
:: :
.
lQI 3232:2 may also be advantageously employed with these nonstructural outer cases or molds. The use o~ plastic activated to ~oam also provides, when complete, substantial thermal insulation to the splice. The flexible sheet material and the flexible foamed plastic ma-terial becomes unnecessary as structure or waterproofing components of the enclosure.
Several advantages are obtained by this unique structure and method. Because the foamed plastic material wrapped about the cables at the end or ends of the mold or case is compressible and resilient, the outer sheet may be quickly and easily forced around the foamed plastic to form a seal which will prevent leakage of resin or foaming plastic during formation of the inner structure. The assembly time for the splice enclosure is substantially reduced because the activated plastic forms within a few minutes! Ackivated resin closures may be left to cure without fear of leakage.
Further, when foaming plastic isused the foam tends to flow until it finally becomes rigid. Consequently, it is not necessary ii i `. to absolutely fix the splice during the curing of the plastic.
:...... ... 20 Because of the simplicity of the structure and the ability of the foam to e~pand into all cavities, the probability of in-. staller error is greatly reduced and any e.rrors in installation become immediately apparent or are overcome by the action of the foam. As a result, the overall cost of both labor and material is greatly reduced. Thus, the present invention .
provides substantial advantage over the heretofore employed nondrying and resin enclosure requiring a rigid case and seals `~. fabricated from mastic.and tape.
In accordance with one broad aspect, the invention relates to a cable splice enclosure comprising compressible ... .
.
foamed plastic wrapped about the cables and spaced from the .''' : ' ' .
., .
: - 4 -L0~323Z~
splice; sh~et material positioned abou-t the splice and held against said flexible ~oamed plastic; a rigid foamed plastic structure filling the interior space defined by said sheet material and said flexible foamed plastic, and mastic rings positioned about the cables between the splice and said compressible foamed plastic, said rings extending into said rigid plastic structure to prevent the passage of moisture ~ ;
along the cables.
In accordance with another aspect, the invention relates to a method for forming a cable splice enclosure comprising positioning compressible material around and between the cables; positioning an enclosure abaut the cables and the splice so as to compress the compressible material to form a seal; filling said enclosure with a body of harden-able material which when hardened will ~orm a rigid structure about said splice, and placing rings of mastic about the cables between the cable splice and the compressible material.
; Accordingly, it is an object of the present invention I to provide an improved cable splice enclosure.
: 20 It is another object of the present invention to pro-vide a method for forming such cable splice enclosures~
It is a ~urther object of the present invention to `
provide an improved outer structure or mold ~or a plastic cable splice enclosure.
Further objects and advantages of the present inven-tion will become readily apparent ~rom the following detailed description and accompanying drawings.
Figure 1 is an exploded assembly of the present in-vention as it may be employed with a splice in a linear cable.
; 30 Figure 2 is a front view of an assembled cable splice enclosure of the present invention. This enclosure : `' ,.. ~"" ..
~ 23:~Z
is an assembled view of the enclosure of Figure 1 and has a sectioned portion for clarity.
Figure 3 is a ~ront view of an enclosure of the present invention as employed with a splice of two adjoining cables.
Figure 4 is a side view of the present invention as shown in Figure 3.
Figure 5 illustrates another embodiment of the ~-~ present invention which incorporates the use of resin.
Figure 6 illustrates an enclosure of the present invention which may be reentered at a later time.
Turning first to the embodiment shown in Figures 1 and 2, there is shown a splice 10 of cables 12 and 14. The ; splice is formed from incoming wires supplied by cables 12 and 14 which are individually connected through wire splices 16. ~ shield connector 18 is also provided. The splice 10, cables 12 and 14 and the shield connector 18 may all be of conventional design and construction.
The assembled cable splice is then enclosed by the cable splice enclosure. In this first embodiment, the cable splice enclosure comprises a flexible outer ~acket generally designated 20 which includes a flexible cover 22 and com-pressible end seals 24 and 26. When assembled, the jacket `
20 provides a closed internal space about the cable splice 10 and the ends of the cables 12 and 14.
The flexible cover 22 may most conveniently include a polyethylene tube. This polyethylene tube is folded in half to form a two-layer sheet 28 and tacked together along lines ~, 30 and 32. This tacking may be accomplished by running a heat-' 30 ed element along these lines. The rectangular sheet 28 there-by formed is flexible and can provide substantial tensile ';'' ~ - 6 _ .
.. . . , . . .:
... . . . . .. .
strength. The tacking along lines 30 and 32 is primarily for convenience. Ba~s 34 and 36 can ~e conveniently located be- ;
tween the tack lines and the folds of the tubing. The bars 34 and 36 when positioned in the edges o~ the rectangular sheet 28 provide a rigid structure for closing the jacket 20 ' about the splice 10. To hold the bars 34 and 36 together, slots 38 are provided through the bars 34 and 36. The slots 38 are aligned to receive fasteners 40. The fasteners 40 are preferably pointed at a first end to allow penetration of the polyethylene tubing at the slots 38. A thin section 42 is provided near the center of the fasteners 40 to allow ~ -rotation of the fasteners 40 in the slots 38. The broader ; end sections of the fasteners 40 are then unable to withdraw . . , ' from the bars 34 and 36. The bars 34 and 36 and the fasteners 40 are preferably of strong plastic or metal to resist the ~ ' tension forces placed in the flexible sheet 28 by the expand-ing foam described below. The number of fasteners 40 and `~
slots 38 depend on the rigidity of the bars 34 and 36, the ~;, expected pressure of the expanding foam placed within the . ~ .
jacket and the length of the enclosure.
The compressible end seals 24 and 26 are secured to the inner side of the flexible sheet 28 at either end thereof.
Epoxy or other bonding substances may be employed to ~ix the end seals onto the flexible sheet 28. The end seals 24 and ~1 26 are preferably of a compressible foamed plastic such as polyurethane or expanded neoprene which is also resilient in , . , order that the compressed material will expand to tightly seal against the cables and the enclosure. In order that the end I seals 24 and 26 do not interfere with the joining of the bars ;1 30 34 and 36, the end seals 24 and 26 need only extend to points , near the weld lines 30 and 32. It is advantageous that the height of each end seal 24 and 26 i5 such that when the bars 34 and 36 are joined, each end seal 24 and 26 will be compres-sed about the cables 12 and 14. The width of each end seal 24 and 26 is preferably such that the seal cannot be readily pushed over to allow escape of the expanding oam placed with-in the jacket. End seals having a width equal to twice the thickness have been found to be quite satisfactory.
These flexible and compressible foamed plastic end seals 24 and 26 replace the use of conventional mastic and tape. The resiliency and compressibility of the flexible end seals 24 and 26 make possible the easy assembly of the flexible plastic sheet ~8 and the spliced cables 12 and 14.
The conventional method for sealing open ends between a casting and spliced cables is to first apply mastic, force the casing over the mastic, add more mastic, and finally cover the entire area with tape. This procedure requires skill and quite a bit of time. Further, a good closure is not guaran-teed especially in cold weather when the mastic is not sticky.
The end seals 24 and 26 are not l`ntended to prevent moisture ;, ; 20 intrusion, but rather cooperate with the remainder of the enclosure system to deine the outer limits of the rigid oamed plastic later positioned ~ithin the enclosure.
Plastia 4~ is aativated to Eoam and is then poured into the jacket 20. The activated plastic is allowed to foam : :~
to fill the space formed by the jacket 20. The spliced cables may be placed in the jacket 20 either beore or after the activated plastic 44 is poured therein. After the plastic .:
~ 44 has been poured into the jacket 20, the bars 34 and 36 , :;
are brought ~ogether and held together by the fasteners 40.
The activated plastic 44 is then allowed to expand to fill the interior space. It is advantageous to place enough , . . .
., : .
, .
... .
., ~
activated plastic 44 in the jacket 20 so that the resulting rigid foamed mass 46 will more than fill a space equal to the interior space of the jacket if allowed to ~reely expand. By using more plastic 44 than is required to just fill the jacket 20, the resulting density of the foam 46 will be greater. This ~
adds structural strength and reduces the chance of leakage. ~ -Further, it enhances the intrusion of the foam into the splice itself. Once the foamed mass 46 is cured, the jacket 20 is no longer required. However, it may be left on the enclosure -for convenience and for whatever added protectian it may pro- ~
vide. The time required for the rigid plastic mass 46 to ex- ~ ;
- pand and strengthen may be set for approximately 10 minutes.
This is far better than the 45 minutes which is often required for resin to cure and strengthen. Rigid polyurethane foam or an equal mixture of polyol and isocyanate can be use to form :,~! .
the mass 46.
I TQ enhance the density of the ri~id foamed plastic ~, 46 and to promote the intrusion of the foaming plastic 46 j into the splice 10, a porous pad 48 may be positioned within the jacket 20. The pad 48 may be a coarse, open-celled, foamed plastic structure such as used for air filters and the like.
This pad 48 is placed about the position where the cable splice 10 will be located in the iacket 20. The activated plastic 44 may then be poured over this pad 48 and the jacket 20 closed.
Because of the open-celled nature of the pad 48, the activated plastic 44 will permeate the pad and flow to the flexible sheet 28 of the jacket 20. When the jacket 20 is closed, the pad 48 -` will be bent around to meet itself and provide a semi-continuous support about the splice 10. The activated plastic 44 will expand about and within the pad 48.- The pad 48 will resist this expansion and thereby increase the final density of the ~` ' .
_ g _ ,, .
,.
~, ,-, , . ~ , ;: foamed plastic mass ~6. During expansion of the activated plastic 44, the .~oaminy substance i5 moved by khe foaming pressure within itself. Under the restraint of the pad 48, the foaming substance will be driven by itself into the cable splice 10 to ~ill all cavities. The pad 48 also provides some strength to -the enclosure.
. To facilitate the assembly of this enclosure, rigid, yet malleable spacers may be included. Only one such spacer 49 is shown; however, two spacers 49, one on each end, are suggested. The spacer 49 is divided at one end into two prongs.
These prongs are illustrated in Figure 1 before assembly. :~
During assembly of the enclosure, the pronged end of each of the spacers is bent around the cable as seen in ~igure 2.
Thus, the spacer will be maintained during assembly of the .
enclosure relative to the cable and splice. At the end op- .
posite the pronged end, a fastener 50 may be employed to attach the spacer to the bars 34 and 36. In this way, the : .
:~ spacer 49 wiLl maintain the bars 34 and 36 at a convenient : position relative to the cables 12 and 14. In order that .~ 20 the spacers will be easy to work with, they may be made con-: veniently from aluminum.
` To insure a proper seal along cables with pol.y-ethylene covers, mastic may be positioned in rings 51 and :
52 about the cables 12 and 14 on either side of the splice 10.
..~., - These mastic rings 51 and 52 are positioned so that they will .~l be within the foamed plastic mass 46. The mastic used may be .' any one of the commercially available mastics such as uncured butyl rubber. The mastic rings 51 and 52 tend to adhere well to the rigid foamed plastic mass 46 and also to the polyethylene : 30 cover on the cables 12 and 14. A barrier is thereby provided - :~
.. which prevents moi.sture intrusion between the rigid foamed . plastic mass 46 and the cables 12 and 14.
.: . .
-- 10 -- , , ~3Z3~2 This first embodiment may also be canstructed to allow reentry into the splice. Such a configuration is il-lustrated in Figure 6 and includes a flexible plastic s~leet 54 wrapped about the splice 10 and held at either end by rub-ber bands 56 or the like. Two rip wires 58 are then positioned on either side of the cable splice 10. These rip wires may be of 20 gauge stainless steel wire. Stainless steel is sug-gested because of its longevity in underground environments, ~ -The rip wires 58 may be held down by the rubber bands 56. The rip wires 58 also extend through the mastic rings 50 and 52 to prevent leakage along the rip wires 58. The enclosure may then be assembled in a conventional manner. When reentry is , required, the jacket 22 can be removed and the rip wires 58 drawn through the rigid foamed plastic mass 46. The inner wrapping 5~ is then exposed and can be easily removed to gain access to the splice. The rip wires shown in Figure 6 are displaced from the sheet material 54 for clarity. However, it is preferred that the wires lie directly on the sheet mate-rial 54 in order that all of the rigid foamed plastic material 46 may be cut.
' A second, less complicated jacket may be employed ~' ....
;; with a cable splice which connects two adjacent cables as ;; illustrated in Figures 3 and 4. Two cables 60 and 62 extend to a splice 64. A shield connector and clamp 66 connects the two cables 60 and 62 together. Such a splice may be used in an underground cable line where each end of the cables to s,::
, be spliced can be brought together as shown in Figures 3 and s", 4.
~ i ~,~ The cables 60 and 62 are wrapped with the compress-ible foamed plastic material used in seals 24 and 26. A seal ;~ 68 is thereby provided. The compressible foamed plastic .
, , . . . .
08~32Z
material is preferably placed between the cables 60 and 62 as well as around these cables to form an adequate seal, -the material thus being generally in the form of a figure eight. A flexible plastic tube 70 is positioned over the splice 64 and is gathered at the seal 68. A conventional tie strip 72 is then placed abou-t the seal 68 and the gathered tube 70. A seal is thereby formed between the tube 70 and the cables 60 and 62. This seal is not impervious to water but provides a strong seal to prevent the flow of the foaming plastic material along the cables.
A plastic sack 74 is also incorporated with this enclosure. The plastic sack 74 and the tubing 70 may both be of polyethylene film. The sack 74 and the tubing 70 are conveniently of the same expanded diameter in order that the ` tubing 70 and the sack 74 will both come to resist radial expansion of the foam at the same time. As with the first embodiment, the tubing 70 and the sack 74 primarily operate as a mold for the rigid foamed plastic which is expanded in the enclosure.
With the seal 68 completed, activated plastic is poured into the interior of the tubing 70. The plastic is not shown for clarity. The tubing 70 is then folded over at 75 and the sack 7~ is positioned ove~ the assembly. The sack 74 is pulled all the way down to the fold 75 in the tubing 70.
As the activated plastic begins to foam, it will initially expand to meet the tubing 70 and the sack 74 at the lower end ., of the enclosure near the seal 68. When the foam begins to exert pressure against the inner sides of the tubing 70 and the concentrically arranged sack 74, the sack will be held by ,: . . . .
friction rom-slipping upward and off of the tubing 70. The expanding foam is then forced upward by the lateral constraint . . : ~ . . .
. .
of the tubing 70 and the sack 74. The foam will eventually rise to the fold 75 in the tubing 70 and begin to force the fold out of the tubing 70. This unfolding of the tubing 70 is resisted because ~he ~olded portion of the tubing 70 is - held between the lower portion of the tubing 70 and the side of the sack 74. The foam is also exerting radial pressure against the inner side of the tubing 70 which acts to hold the fold in place and keep the plastic sack 74 down on the tubing 70. Vent holes 76 are provided at the top of the plastic sack 74 in order that gas pressure cannot build up in the sack 74 and prematurely force it off the tubing 70. The cooperation of the tubing 70 and the sack 74 to hold the fold in the tubing ~' 70 and to hold the sack down on the tubing causes the rigid foam to expand within a constrained volume. This acts to in-crease the density of the foam for greater strength and im-penetrability. The expanded enclosure is shown in phantom in ;
Figures 3 and 4. In some cases it may not be necessary to employ the sack 74; the tubing alone being sufficient to form the splice enclosure. This is especially true ~here activated resin rather than foaming plastic is poured into the tubing 70.
;~ As with the embodiment illustrated in Figure l, a ., porous pad 78 may be employed to further increase the density of the foam, cause the foaming material to penetrate the splice , 64, and strengthen the overall enclosure structure. The pad ,. I .
78 is preferably provided with a hole at 80 and is positioned ~' over the cable ends 60 and 62. The mesh pad 78 may be posi-.", tioned before the splice 64 is made. When the pad 78 is ,. ,~
positioned first, a smaller hole or holes are required in the center of the pad 78.
, ,-1 `~ 30 A bead of mastic may also be employed about the ' : ,, cables 60 and 62 near the seal 68. The mastic adheres well ,~, .
'.,' .
L08~
to the polyethylene covers on the cables 60 and 62 and becomes embedded in the resulting rigid foamed plastic enclosure.
The mastic thereby prevents wa-ter intrusion at the inner face between the cables 60 and 62 and the r;gid foamed plastic mass.
- A third embodiment is illustrated in ~igure 5. Again, -a seal 84 is formed about the cables 86 and 88 by threading a piece of flexible, compressible, foamed plastic material around the cables 86 and 88. The cable and seals are then jammed into the hole located at 90 in the pliable plastic ` enclosure 92. Resin 94 may then be poured into the enclosure 92 and allowed to cure. In this application, a conduit 96 is shown extending upward about the splices 98 and 100 to meet cables 102 and 104.
on all three embodiments, a seal is provided about the cables which is designed to prevent the flow of the internal sealing material and is not specifically designed to prevent moisture intrusion. Further, the jackets and outer ` enclosures act primarily as molds for the placement of foaming plastics or resin. In the first two embodiments, these molds further operate to constrain the expansion of the foaming plastic to increase the final density of the ri~id Eoamed plastic mass which forms the cable splice enclosure. Thus, in the present invention, the outer casing or jacket structure may be of inexpensive and easily worked materials. The inner ~ ;
structure formed by the foamed plastic provides the structural ~;l rigidity and imperviousness necessary for underground cable splice enclosures. Once the splice is completed, the enclosure , in all instances may be quickly and easily provided and the -foam added and cured in substantially less time than it takes for the resin in conventional enclosures to cure.
-- .
i~ - 14 -lO~Z322 While embodiments and applications of this inven-tion have been shown and described, it would be apparent to those skilled in the art that many more modifications are possible withou-t departing from the inventive concepts herein described. The invention, there~ore, is not ~o be restricted :~
except by the spirit of the appended claims.
., .
".~
;~
. ` .
:, :
.
, .. .. .
,', .,`
.~
:: ,
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A cable splice enclosure comprising compressible foamed plastic wrapped about the cables and spaced from the splice;
sheet material positioned about the splice and held against said compressible foamed plastic; a rigid foamed plastic structure filling the interior space defined by said sheet material and said compressible foamed plastic, and mastic rings positioned about the cables between the splice and said compressible foamed plastic, said rings extending into said rigid plastic structure to prevent the passage of moisture along the cables.
sheet material positioned about the splice and held against said compressible foamed plastic; a rigid foamed plastic structure filling the interior space defined by said sheet material and said compressible foamed plastic, and mastic rings positioned about the cables between the splice and said compressible foamed plastic, said rings extending into said rigid plastic structure to prevent the passage of moisture along the cables.
2. The device of claim l wherein said enclosure further includes flexible sheet material wrapped tightly about said splice interior to said sheet material positioned about the splice.
3. The device of claim 2 wherein said enclosure further comprises rip wires extending along the cables and said flexible sheet material wrapped tightly about the splice.
4. The device of claim l wherein said sheet material positioned about the splice includes a piece of flexible tubing gathered at one end about said compressible foamed plastic and a sack positioned over said tubing, said sack and said tubing having substantially the same expanded diameters.
5. The device of claim 1, wherein said flexible sheet material includes a piece of flexible tubing positioned about the splice and gathered about said compressible foamed plastic to form a seal and a sack positioned over said tubing.
6. The device of claim 5, wherein said tubing and said sack have substantially equal diameters.
7. The device of claim 5, wherein said tubing may be folded over, above the splice, and said sack may be further drawn over said tubing.
8. The device of claim 5, wherein said enclosure further includes a porous pad positioned within said tubing about the cable splice.
9. The device of claim 5, wherein said sack has vent holes located at the closed end thereof.
10. The splice of claim 1 including an end seal in the form of a piece of compressible foamed plastic wrapped about the cables; said flexible sheet material being gathered about said end seal; and means for tying said flexible sheet material tightly against said seal where said flexible sheet material is gathered about said seal.
11. The device of claim 10 wherein said flexible sheet material is flexible tubing.
12. The device of claim 10 wherein said enclosure further includes a sack positioned over said flexible sheet material.
13. A method for forming a cable splice enclosure comprising positioning compressible material around and between the cables; positioning an enclosure about the cables and the splice so as to compress the compressible material to form a seal; filling said enclosure with a body of hardenable material which when hardened will form a rigid structure about said splice; and placing rings of mastic about the cables between the cable splice and the compressible material.
14. The method of claim 13 wherein the step of positioning the enclosure about the splice and the compressible material includes the steps of positioning a piece of flexible tubing about the cable splice; gathering that flexible tubing about the compressible material; folding over the upper portion of the tubing; and positioning a plastic sack over the tubing.
15. A method for forming a cable splice enclosure comprising the steps of wrapping the cables at a distance from the splice with compressible foamed plastic material;
positioning flexible sheet material about the splice and the compressible foamed plastic material; securing the flexible sheet material against the compressible foamed plastic material;
activating plastic material to cause it to foam into a rigid foamed plastic mass; pouring that activated plastic material into the space defined by the flexible sheet material and the compressible foamed plastic material; and closing the flexible sheet material about the splice.
positioning flexible sheet material about the splice and the compressible foamed plastic material; securing the flexible sheet material against the compressible foamed plastic material;
activating plastic material to cause it to foam into a rigid foamed plastic mass; pouring that activated plastic material into the space defined by the flexible sheet material and the compressible foamed plastic material; and closing the flexible sheet material about the splice.
16. A method for forming a cable splice enclosure comprising the steps of wrapping the cables at a distance from the splice with compressible flexible foamed plastic material;
positioning flexible, thin-walled tubing about the splice and the compressible foamed plastic material; gathering the flexible tubing about the compressible foamed plastic material;
securing the gathered tubing about the compressible foamed plastic material; placing a ring of mastic about the cables between the splice and the compressible foamed plastic material;
activating the plastic material to cause it to foam into a rigid foamed plastic mass; pouring that activated plastic material into the tubing about the splice; folding the top of the tubing over at a line just above the cable splice; and placing a plastic sack over the folded tubing.
positioning flexible, thin-walled tubing about the splice and the compressible foamed plastic material; gathering the flexible tubing about the compressible foamed plastic material;
securing the gathered tubing about the compressible foamed plastic material; placing a ring of mastic about the cables between the splice and the compressible foamed plastic material;
activating the plastic material to cause it to foam into a rigid foamed plastic mass; pouring that activated plastic material into the tubing about the splice; folding the top of the tubing over at a line just above the cable splice; and placing a plastic sack over the folded tubing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65126176A | 1976-01-22 | 1976-01-22 | |
| US651,261 | 1976-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1082322A true CA1082322A (en) | 1980-07-22 |
Family
ID=24612175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,179A Expired CA1082322A (en) | 1976-01-22 | 1977-01-21 | Method and device for enclosing a cable splice using foamed plastic material |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS5291188A (en) |
| AT (1) | AT363138B (en) |
| BR (1) | BR7700371A (en) |
| CA (1) | CA1082322A (en) |
| CH (1) | CH619326A5 (en) |
| DE (1) | DE2702575C2 (en) |
| ES (1) | ES455244A1 (en) |
| FR (1) | FR2339270A1 (en) |
| GB (1) | GB1568102A (en) |
| IE (1) | IE44057B1 (en) |
| IN (1) | IN147198B (en) |
| IT (1) | IT1074103B (en) |
| MX (1) | MX143446A (en) |
| NZ (1) | NZ183129A (en) |
| SE (1) | SE7700367L (en) |
| ZA (1) | ZA77145B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL182111C (en) * | 1979-04-25 | 1988-01-04 | Filoform Chem Ind Bv | METHOD FOR APPLYING A SLEEVE AROUND A WELD OR WELDING FOR CABLE CONDUCTORS AND PLASTIC STRIP |
| DE3373957D1 (en) * | 1982-07-26 | 1987-11-05 | Raychem Sa Nv | Method and device for sealing |
| JPS59142523U (en) * | 1983-03-14 | 1984-09-22 | アイシン精機株式会社 | Gear transmission synchronizer |
| NL8500813A (en) * | 1985-03-20 | 1986-10-16 | Filoform Chem Ind Bv | METHOD FOR APPLYING A WATER LOCK IN A MULTI-WIRE CABLE OR SIMILAR GUIDE, AND FOIL USED IN CARRYING OUT THE SAID METHOD. |
| DE3905441C2 (en) * | 1989-02-22 | 1994-01-20 | Minnesota Mining & Mfg | Metallic inner jacket for an electrical cable connection |
| GB8915258D0 (en) * | 1989-07-03 | 1989-08-23 | Raychem Gmbh | Cable blocking |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3122597A (en) * | 1962-05-01 | 1964-02-25 | Northern Electric Co | Method of sealing joints in plastic coated electrical cables |
| GB971203A (en) * | 1962-08-16 | 1964-09-30 | Nl Kabelfabrieken Nv | Improvements in or relating to cable sleeves |
| DE2129342C3 (en) * | 1971-06-12 | 1975-02-13 | John Thomas Los Angeles Thompson | Capsule device for accommodating spliced connections of electrical conductors |
| JPS5014583B2 (en) * | 1971-10-27 | 1975-05-29 | ||
| JPS4940545U (en) * | 1972-07-13 | 1974-04-10 | ||
| US3836702A (en) * | 1973-04-03 | 1974-09-17 | Plummer Walter A | Means for sealing and protecting a cable splice |
| JPS5014583U (en) * | 1973-06-01 | 1975-02-15 |
-
1977
- 1977-01-12 ZA ZA770145A patent/ZA77145B/en unknown
- 1977-01-13 CH CH41377A patent/CH619326A5/en not_active IP Right Cessation
- 1977-01-14 SE SE7700367A patent/SE7700367L/en not_active Application Discontinuation
- 1977-01-18 AT AT0025777A patent/AT363138B/en not_active IP Right Cessation
- 1977-01-19 NZ NZ183129A patent/NZ183129A/en unknown
- 1977-01-19 MX MX167757A patent/MX143446A/en unknown
- 1977-01-19 BR BR7700371A patent/BR7700371A/en unknown
- 1977-01-20 IE IE109/77A patent/IE44057B1/en unknown
- 1977-01-20 JP JP446677A patent/JPS5291188A/en active Granted
- 1977-01-21 IT IT47758/77A patent/IT1074103B/en active
- 1977-01-21 CA CA270,179A patent/CA1082322A/en not_active Expired
- 1977-01-21 ES ES455244A patent/ES455244A1/en not_active Expired
- 1977-01-21 GB GB2614/77A patent/GB1568102A/en not_active Expired
- 1977-01-21 IN IN87/CAL/79A patent/IN147198B/en unknown
- 1977-01-21 FR FR7701754A patent/FR2339270A1/en active Granted
- 1977-01-22 DE DE2702575A patent/DE2702575C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE7701782U1 (en) | 1977-08-08 |
| NZ183129A (en) | 1981-02-11 |
| JPS5291188A (en) | 1977-08-01 |
| IE44057B1 (en) | 1981-07-29 |
| BR7700371A (en) | 1977-09-20 |
| DE2702575A1 (en) | 1977-07-28 |
| GB1568102A (en) | 1980-05-21 |
| ATA25777A (en) | 1980-12-15 |
| ES455244A1 (en) | 1978-01-01 |
| MX143446A (en) | 1981-05-12 |
| ZA77145B (en) | 1977-11-30 |
| IT1074103B (en) | 1985-04-17 |
| SE7700367L (en) | 1977-07-23 |
| IN147198B (en) | 1979-12-15 |
| DE2702575C2 (en) | 1986-08-21 |
| FR2339270B1 (en) | 1981-10-16 |
| JPS5740729B2 (en) | 1982-08-30 |
| CH619326A5 (en) | 1980-09-15 |
| AT363138B (en) | 1981-07-10 |
| AU2124077A (en) | 1978-09-07 |
| FR2339270A1 (en) | 1977-08-19 |
| IE44057L (en) | 1977-07-22 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |