CA1207045A - Electric cable connection with quick action closure - Google Patents
Electric cable connection with quick action closureInfo
- Publication number
- CA1207045A CA1207045A CA000425883A CA425883A CA1207045A CA 1207045 A CA1207045 A CA 1207045A CA 000425883 A CA000425883 A CA 000425883A CA 425883 A CA425883 A CA 425883A CA 1207045 A CA1207045 A CA 1207045A
- Authority
- CA
- Canada
- Prior art keywords
- sheet material
- connection
- cable
- enclosure
- casting mass
- 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
- 239000000463 material Substances 0.000 claims abstract description 104
- 230000005611 electricity Effects 0.000 claims abstract 2
- 238000005266 casting Methods 0.000 claims description 57
- 238000007789 sealing Methods 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000013013 elastic material Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 206010043268 Tension Diseases 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 10
- 230000001788 irregular Effects 0.000 description 4
- 229920002994 synthetic fiber Polymers 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 229920001084 poly(chloroprene) Polymers 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- -1 for example Polymers 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 101100494762 Mus musculus Nedd9 gene Proteins 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229940000425 combination drug Drugs 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- YDTFRJLNMPSCFM-YDALLXLXSA-M levothyroxine sodium anhydrous Chemical compound [Na+].IC1=CC(C[C@H](N)C([O-])=O)=CC(I)=C1OC1=CC(I)=C(O)C(I)=C1 YDTFRJLNMPSCFM-YDALLXLXSA-M 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
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
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
-
- 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
-
- 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
Landscapes
- Cable Accessories (AREA)
- Processing Of Terminals (AREA)
- Insulating Bodies (AREA)
Abstract
ABSTRACT
In a cast-filled electrical cable connection for low or medium voltage electricity supply networks, the connection area is surrounded by a rubber-elastically stretchable and elastically stretched sheet material which closely contacts under tension the connection area and the cables and it connected in itself to form an enclosure by a quick action closure adapted to be closed under ten-sion.
In a cast-filled electrical cable connection for low or medium voltage electricity supply networks, the connection area is surrounded by a rubber-elastically stretchable and elastically stretched sheet material which closely contacts under tension the connection area and the cables and it connected in itself to form an enclosure by a quick action closure adapted to be closed under ten-sion.
Description
1~2~7~4~
ELECTRIC CABLE CONNECTION
Technical Field The invention relates to an electric cable con nection as well as to a process for the production of S such a cable connection.
Background Art In a known cable connection of the type indicated (U.S. Patent letter 3,419,669) pressure-sensitive self-sealing strips are provided at all -the edges of a rec-tang-ular sheet upon which a spacer material is provided.In the making of this known cable connection the sheet is placed around the connection area, the transverse edges are pressed against the cable sheaths, the longitudinal edges are pressed together except for a small remainder portion forming an introduction opening for the casting mass, and the casting mass is filled in.
The sheet material in this case must be dimen-sioned such that it will be capable with the type of cable connection for which it is to be used to enclose even the maximum perimeter being present of the connection area. Correspondingly great will be the necessary amount of cas-ting mass. In order to reduce this amount, i L is possible in the production of the known cable connection to tightly press the sheet material arranged therearound against the connection area in certain places by means of clamps. Thereby it is intended to prevent the enclosure formed by the laid-around sheet material from becoming filled to the maximum possible volume by the casting mass.
The clamps mentioned are inconvenient to use. Because 3() ~-r ~ c~ c>~: l I y i rr~cJ~I:L~Jr ~ C ~ (,ol-c~ c~c~rlll~
their fitting requires a certain skill. Nevertheless, they may easily slide off again, especially if the core connection happens to be a little thicker or particularly irregular. Often the clamps are not at hand or get lost.
The obtainable saving in casting mass is insignificant.
In another known cable connection (United States patent letter 3,967,795) the enclosure is formed of a wrapper made with insulating tape. I'hereby it may indeed be ensured that the enclosure will lie closely against the connection area conforming to the shape thereof so that but a relatively small amount of casting mass will be necessary to fill the enclosure, however, the production of a suEficiently tight wrapper is very costly in terms of time and labor and requires care and skill.
Summary of Invention It is the object of the invention to provide a poured cable connection which may be made conveniently and quickly also by less skilled labor and which can do with a very small amount of pouring material.
The present invention provides a process for the produc-tion of a cable connection, especially for low and medium voltage current supply networks, in a connection area between two e].ectri-cal cables each comprising at least one core and one cable sheath, said process comprising the following steps: a) making a core connection and preferably insulating same, b) laying a sheet material around the connection area from cable sheath to cable sheath, if desired or required, with the interposition of a spacer material which is adapted to be permeated by the casting mass, c) sealing the sheet material at the cable sheaths, preferably by means of sealing means provided on the sheet material, d) Eorming an essentially closed enclosure by interconnecting oppositely dis-posed strip-like areas, preferably marginal areas, of the sheet material laid around, e) introducing a curable cas-ting mass into the enclosure until it is completely filled, and f) curing the lZ~7~45 , ~
casting mass, characterized in that the enclosure is formed by g) providing the sheet material as a sheet of strongly rubber-elastic material and closing it on and about the connection area while being subjected to elongation by means of quick-action closure means adapted to be closed under a transverse tension, preferably in the form of a zipper, and h) introducing the casting mass at a pressure insuEficient to substantially inflate the enclosure.
From another aspect, the invention provides an electric cable connection, especially for low and medium voltage electrici-ty supply networks, in a connection area between at least twoelectrical cables each having at least one core and a cable sheath, the cable connection comprising a core connection which preferably is provided with a core connection insulation, an en-closure formed of flexible material extending sealingly from cable sheath to cable sheath over the connection area and having a sheet material laid around the cables, said sheet material having oppo-sitely disposed interconnected longitudinal strip areas preferably along longitudinal edges of the sheet material and transverse edges lying in close contact against the cable sheaths, said transverse edges being preferably provided with sealing means, and a casting mass filled into the enclosure, with a spacer material preferably provided between the sheet material and the core con-nection, which is permeated by the casting material and preferably fixedly attached to the inner surface of the sheet material, char-acterized in that the sheet material is strongly stretchable rub-ber-elastic, and is dimensioned so that it can be closed around the connection area only when stretched, and in that the longitu-dinal strip areas of the sheet material are provided with quick-action closure means - 2a -207~?~S
closing under transverse tension.
With the cable connection according to the invention the rubber-elastic enclosure lies closely against the cable sheaths and the connection area under the tension caused by the stretching, conforming also to irregular contours such as may be given in the connection area especially with multiple core cables. Because of the close yielding to the shape of the enclosure the space to be filled with the pouring mass is very small so that the consumption of casting mass is correspondingly low. With the quick-acting closure means, preferably in the form of a zipper, the sheet material may be conveniently drawn together and closed for the formation of the enclosure, in which connection rather high elonga-tion stresses may be generated by hand in the enclosure. The cast-ing mass can therefore be introduced at a relatively high pressure, without the enclosure being caused to expand to a disturbing extent, whereby the casting mass may be introduced quickly, quickly and completely penetrating through all the interstices and expelling the air. The casting obtained after curing the casting mass will then be essentially free of air occlusions and thus mechanically solid and electrically safe. It consists only of the ~ - 2b -` ~1207~5 really necessary minimum amount of casting mass. In sum-mary, there results thus an extremely advantageous combina-tion of easy production, a considerable saving in casting mass, and high mechanical strength and electric quality of the connection.
Cable protection sleeves have indeed become known which are formed o~ a sheet material placed around ~ , p,o cr the cable and a aipo~c~ provided therea-t, said sleeves extending from cable sheath to cable sheath forming a sealing therebetween (U.S. patent letter 3,187,090).
But these protective sleeves are only forming an addition-al safety structural member over an otherwise finished and outwardly sealed and protected cable connection.
A noticeable elongation of the protective sleeve is not provided for, and neither is the filling-in of a casting mass, and the protective sleeve must be tailored to sui-t the respective cable connection because of the poor exten-sibility. Other embodiments of these known protective sleeves are designed as dimensionally stable pockets which are only temporarily placed around a cable connection which has not yet been completed in order to avoid ingress of moisture or dirt during an interruption of work, or the like. There as well, no elongation of the protective sleeve is provided nor the fillinq-in of a casting mass.
Similar protective sleeves intended for temporary applica-tion and closable by zippers are described in the ~.S.
patent letter 3,495,026. These known protective sleeves consist of synthetic material, for example, polyvinyl chloride, polyethylene and the like. There is no elonga-tion provided for these protective sleeves nor any fill-ing-in of casting mass.
Mcntion should bc made~ furLherrnore of Lhc L~cL
tha-t a flexible protective sleeve provided with a zipper has become known for different purposes from U~S. patent letLr_r 3,038,557; this known protective sleeve is intended in particular for the purpose of providing a supply of grease on bo~den cables. There is no similarity ~o the present invention.
~;~0704S
Finally, it should be noted that it has been known already for quite a time from the U.S. patent letter
ELECTRIC CABLE CONNECTION
Technical Field The invention relates to an electric cable con nection as well as to a process for the production of S such a cable connection.
Background Art In a known cable connection of the type indicated (U.S. Patent letter 3,419,669) pressure-sensitive self-sealing strips are provided at all -the edges of a rec-tang-ular sheet upon which a spacer material is provided.In the making of this known cable connection the sheet is placed around the connection area, the transverse edges are pressed against the cable sheaths, the longitudinal edges are pressed together except for a small remainder portion forming an introduction opening for the casting mass, and the casting mass is filled in.
The sheet material in this case must be dimen-sioned such that it will be capable with the type of cable connection for which it is to be used to enclose even the maximum perimeter being present of the connection area. Correspondingly great will be the necessary amount of cas-ting mass. In order to reduce this amount, i L is possible in the production of the known cable connection to tightly press the sheet material arranged therearound against the connection area in certain places by means of clamps. Thereby it is intended to prevent the enclosure formed by the laid-around sheet material from becoming filled to the maximum possible volume by the casting mass.
The clamps mentioned are inconvenient to use. Because 3() ~-r ~ c~ c>~: l I y i rr~cJ~I:L~Jr ~ C ~ (,ol-c~ c~c~rlll~
their fitting requires a certain skill. Nevertheless, they may easily slide off again, especially if the core connection happens to be a little thicker or particularly irregular. Often the clamps are not at hand or get lost.
The obtainable saving in casting mass is insignificant.
In another known cable connection (United States patent letter 3,967,795) the enclosure is formed of a wrapper made with insulating tape. I'hereby it may indeed be ensured that the enclosure will lie closely against the connection area conforming to the shape thereof so that but a relatively small amount of casting mass will be necessary to fill the enclosure, however, the production of a suEficiently tight wrapper is very costly in terms of time and labor and requires care and skill.
Summary of Invention It is the object of the invention to provide a poured cable connection which may be made conveniently and quickly also by less skilled labor and which can do with a very small amount of pouring material.
The present invention provides a process for the produc-tion of a cable connection, especially for low and medium voltage current supply networks, in a connection area between two e].ectri-cal cables each comprising at least one core and one cable sheath, said process comprising the following steps: a) making a core connection and preferably insulating same, b) laying a sheet material around the connection area from cable sheath to cable sheath, if desired or required, with the interposition of a spacer material which is adapted to be permeated by the casting mass, c) sealing the sheet material at the cable sheaths, preferably by means of sealing means provided on the sheet material, d) Eorming an essentially closed enclosure by interconnecting oppositely dis-posed strip-like areas, preferably marginal areas, of the sheet material laid around, e) introducing a curable cas-ting mass into the enclosure until it is completely filled, and f) curing the lZ~7~45 , ~
casting mass, characterized in that the enclosure is formed by g) providing the sheet material as a sheet of strongly rubber-elastic material and closing it on and about the connection area while being subjected to elongation by means of quick-action closure means adapted to be closed under a transverse tension, preferably in the form of a zipper, and h) introducing the casting mass at a pressure insuEficient to substantially inflate the enclosure.
From another aspect, the invention provides an electric cable connection, especially for low and medium voltage electrici-ty supply networks, in a connection area between at least twoelectrical cables each having at least one core and a cable sheath, the cable connection comprising a core connection which preferably is provided with a core connection insulation, an en-closure formed of flexible material extending sealingly from cable sheath to cable sheath over the connection area and having a sheet material laid around the cables, said sheet material having oppo-sitely disposed interconnected longitudinal strip areas preferably along longitudinal edges of the sheet material and transverse edges lying in close contact against the cable sheaths, said transverse edges being preferably provided with sealing means, and a casting mass filled into the enclosure, with a spacer material preferably provided between the sheet material and the core con-nection, which is permeated by the casting material and preferably fixedly attached to the inner surface of the sheet material, char-acterized in that the sheet material is strongly stretchable rub-ber-elastic, and is dimensioned so that it can be closed around the connection area only when stretched, and in that the longitu-dinal strip areas of the sheet material are provided with quick-action closure means - 2a -207~?~S
closing under transverse tension.
With the cable connection according to the invention the rubber-elastic enclosure lies closely against the cable sheaths and the connection area under the tension caused by the stretching, conforming also to irregular contours such as may be given in the connection area especially with multiple core cables. Because of the close yielding to the shape of the enclosure the space to be filled with the pouring mass is very small so that the consumption of casting mass is correspondingly low. With the quick-acting closure means, preferably in the form of a zipper, the sheet material may be conveniently drawn together and closed for the formation of the enclosure, in which connection rather high elonga-tion stresses may be generated by hand in the enclosure. The cast-ing mass can therefore be introduced at a relatively high pressure, without the enclosure being caused to expand to a disturbing extent, whereby the casting mass may be introduced quickly, quickly and completely penetrating through all the interstices and expelling the air. The casting obtained after curing the casting mass will then be essentially free of air occlusions and thus mechanically solid and electrically safe. It consists only of the ~ - 2b -` ~1207~5 really necessary minimum amount of casting mass. In sum-mary, there results thus an extremely advantageous combina-tion of easy production, a considerable saving in casting mass, and high mechanical strength and electric quality of the connection.
Cable protection sleeves have indeed become known which are formed o~ a sheet material placed around ~ , p,o cr the cable and a aipo~c~ provided therea-t, said sleeves extending from cable sheath to cable sheath forming a sealing therebetween (U.S. patent letter 3,187,090).
But these protective sleeves are only forming an addition-al safety structural member over an otherwise finished and outwardly sealed and protected cable connection.
A noticeable elongation of the protective sleeve is not provided for, and neither is the filling-in of a casting mass, and the protective sleeve must be tailored to sui-t the respective cable connection because of the poor exten-sibility. Other embodiments of these known protective sleeves are designed as dimensionally stable pockets which are only temporarily placed around a cable connection which has not yet been completed in order to avoid ingress of moisture or dirt during an interruption of work, or the like. There as well, no elongation of the protective sleeve is provided nor the fillinq-in of a casting mass.
Similar protective sleeves intended for temporary applica-tion and closable by zippers are described in the ~.S.
patent letter 3,495,026. These known protective sleeves consist of synthetic material, for example, polyvinyl chloride, polyethylene and the like. There is no elonga-tion provided for these protective sleeves nor any fill-ing-in of casting mass.
Mcntion should bc made~ furLherrnore of Lhc L~cL
tha-t a flexible protective sleeve provided with a zipper has become known for different purposes from U~S. patent letLr_r 3,038,557; this known protective sleeve is intended in particular for the purpose of providing a supply of grease on bo~den cables. There is no similarity ~o the present invention.
~;~0704S
Finally, it should be noted that it has been known already for quite a time from the U.S. patent letter
2,756,172 in connection with pipes of cast iron or ti~e like which are provided with an outer insula-tion of as-bestos or the like, and an enclosure holding togetherthe insulation, to ~orm the insulation, instead oE canvas, of a sheet material which in cases may also be elastic, and to close the same by means of a zipper closure. This does not, however, involve cable connections, and nei-ther in the said patent let-ter nor elsewhere it has been pro-posed or suggested tha-t a similar principle can be success-fully employed with cable connections.
The present statement that the sheet material is capable of elastic elongation like rubber, is meant to say that ther~ is an expansibility as it is known from natural or synthetic rubber. Such an expansibility may be obtained in different ways; in the simplest case by making the foil part substantially entirely of rubber-elas-tic material. But other embodiments are also possible, in which only portions of the sheet material consist of rubber-elastic material capable of elongation, and/or in which a rubber-elastic expansibility is present predom-inantly or exclusively in the transverse direction only (in a radial direction with respect to the axis of the cable connection). In general, such embodiments will be preferred in which the sheet material consists substan-tially entirely of rubber-elastic material, because then the essential advantage obtained in accordance with the invention, i.e. the contiguously close covering of even irregular contours in the connection area, is afforded UIld;lllilliSI~d~ ~;U~ rre9U1.1r: COrll;OUrS 111aY LOLIII .;.11 ~.lrt.i-cular in connection o~ multiple core cables, in which block- or ball-like core connections arc distributed in the conne~tion area. With the aid of sheet mat~rials which are only flexible but not rubber-elastic, cylindri-cal connection areas at best may be smoothly covered on ~2(~7~S
all sides, but not connection areas of more complicated shape, such as double-conical or irregular connection areas.
The invention will be described in the following in more detail by way of examples of embodimen-t and in connection with the drawings, wherein BrieE Description of Drawings Figure 1 is a diagrammatic perspective view of a cable connection according to the invention with parts broken away; Figure 2 is a diagrammatic perspective representation of a sheet material suited for making the cable connection according to Figure l; Figure 3 is a view similar to Figure 1 showing a diagrammatic perspec-tive representation of another embodiment of a cable con-nection according to the invention; Figure 4 is a viewsimilar to Figure 2 showing a fractional diagrammatic perspective view of another embodiment of a sheet material for the production of a cable connection according -to the invention; Figure 5 is a diagrammatic perspective view corresponding to Figure 2 showing a different embo~i-ment of a sheet material suited to make the cable connec-tion according to the invention; Figure 6 is a diagram-matic perspective view of the inner surface of another embodiment of a sheet material suited for the production of a cable connection according to the invention; and Figures 7 to 11 are diagrammatic views of different stages during the production of a cable connection according to the invention.
Detailed Description Figures 2 to 11, parts occurring in a correspond-ing form in Figure 1 are designated with the same refer-ence numerals but with a number characterizing the respec-tive Figure placed in front. To avoid repeti-tions, in connection with such reference numerals, also Figure l and the apper-taining specification will always have to be referred to.
F-i.gure l shows an electric cable conncc~:i.on ~7Q4S
for connecting two electric cables 1, 3, each comprising a cable sheath S and 7, respectively, and three coxes.
In Figure 1, only the cores 9~ 11 and 13 of cable 1 are recognizable in the portion of the cable connection -that 5 has been broken away. The cores are connected to each other by core connections 15, 17, 19 which are surrounded by core connection insulations 21, 23, 25 and kept mutual-ly spaced from each other. The entire arrangement is surrounded by an enclosure 27 formed of flexible material 10 sealingly extending from cable sheath 5 to cable sheath 7 over the connection area 29, and comprising sheet mater-ial 31 laid around the cables, which is connected in it-self in two oppositely disposed longitudinal strip areas 33, 35 to form the enclosure 27. The connection is by 15 means of a zipper 37 which is closable in the usual manner by means of a slide 38. The longitudinal strip areas connected to each other are prererably provided along the longitudinal edges of the sheet material 31. In the embodiment shown in Figure 1, the longitudinal strip area 20 33 shown as the upper one in Figure 1 together with the s one part of the ~ e~ 37 is provided along one longi-tudinal edge of the sheet material 31, while the longitudi-nal strip area 35 shown as the lower one in Figure 1 to-gether with the second part of the zipper provided there 25 is arranged spaced through a distance from the adjacent longitudinal edge 39 of the sheet material 31, so ~hat in the condition of being laid around a sealing ledge 40 wlll form covering the closed zipper 37 from below and sealing the zipper 37 against the interior of the 30 enclosure 27.
The transverse edges 41, 42 of the sheet mater-ial 31 are provided with sealing means 43, 45 in the form of selE-sealing strips and thus are also sealed at -the cable sheaths 5 and 7, respectively. These sealing strips 35 may be fastened at the inner surface of the sheet ma-terial 31 or may be formed integrally with the sheet material 31.
12~7~4~
A castlng mass 47 capable of being cured is filled into the sleeve-shaped enclosure 27, which fills all the interstices and after curing will form a mechani-cally solid block. Provided between the sheet material 31 and the core connections 15, 17, 19 is a spacer material 49 wh-ch preferably consists of an open matting and is penetrated by the casting mass 47. For the usual multiple core low voltage cable connections, for instance, in 1 lV
household current supply mains and the like, a mat of an open matting having a thickness of 5 to 20 mm is suited which consists of loosely interconnected randomly oriented fibers of synthetic material having a diameter of about 0.5 mm. Suitable open mattings of polyamide or polyester fibers are commercially available.
The sheet material 31 is strongly rubber-elasti-cally extensible and, according to the embodiment of Figure 1, for this purpose, consists as a whole of a strongly extensible rubber-elastic material such as, for instance, neoprene or the like. Especially suited for cable connec-tions of the above mentioned type are sheets of a poly-chloroprene polymer having the following properties:
Shore hardness 36 Tensile strength ~MPa) 15.5 Elongation at break (%) 895 Breaking strength (N/mm) 26.
The zipper 37 shown in Figure 1 is a particular-ly simple and advantageous embodiment of a quick-acting connec-ting means which is adapted to be closed under a transverse tension. Other forms of such quick-acting closure means include, for instance, internegaging profile sections which may be hooked into each o-ther by means of a closure~slide, similar to a usual zipper. In each case i-t is necessary tha-t the quick-acting closure means closes, and preferably is also closable, while being under transverse tension because in the cable connection describ-ed, the enclosure 27 sits on the connection area while ~Z076~5 being elastically stretched. The sheet material 31 is dimensioned such that it can be closed about the conec-tion area 29 only under stretching and the zipper 37 is designed in such a manner that it can be pulled closed under a transverse tension. Thereby, the rubber-elastic sheet material 31 is stretc-hed and subjected to a tensile stress . The tensile stress may be considerable and is restricted only by the force available for pulling the zipper closed.
The filling-in o~ the casting mass 47 may on principle be carried out in any suitable manner, for in-stance, through an aperture in the enclosure 27 formed therein by piercing it with a syringe. Because of -the high stretching forces which are possible in the enclosure 27 it is, however, recomended to provide the sheet mater-ial 31 with a special casting mass introduction aperture 53 at a location remote from the edges thereof, which may easily be designed in such a manner that the shee-t material 31 will not rupture in that location. What is particularly advantageous is the formation thereof in a strength-enhancing connecting piece 55 which may easily be made in one piece with the sheet material 31 and which may, in addition, easily be designed for contac-ting with an injection nozzle of a casting mass injection apparatus (now shown).
The sheet material 31, suitably, has at least one air exit opening. In that case one does not have to rely on the air escaping through leaks, for example, of the quick-acting closing means (zipper 37) upon the casting mass being filled in, and can design the quick-act-ing closure means as well as also the seals 43, ~5 in such a manner tha-t a high degree of -tightness is ensured.
This is easily possible in connection with zippers in ~ we1 I-lcnown m~nncr in that the :inl:c~c~ 3~lcJillcJ clo(;;llrc sec-tions provided in -the longitudinal strip areas 33, 35 are formed as continuous ledges of synthetic material (not shown). Such ledges of synthetic material may, be-~L2~704~i sides, advantageously be formed at least in part integral-ly with the sheet material 31; this simplifies substantial-ly the production.
In the embodiment according to Figure 1, air exit openings 57, 59 are provided one each on either trans-verse edge 41, 42 of the sheet material 31. In both embod-iments shown, these openings are quite simply formed by hoses 61 and 63, respectively, which are passing through the sealing means 43 and 45, respectively, or are simply fixed by an adhesive to the inner surface of the sealing means, or are inserted below the sealing means when the sheet material 31 is laid around. This known-per-se tech-nique is very simple and enables a safe predication as to when the cable connection is completely filled with the casting mass; in that case, excess casting mass will exit from both air exit openings 57 and 59. So that the casting mass will exit only after the filling of the enclo-sure 27 has been completed, it is to the purpose to arrange the casting mass introduction opening 53 spaced from the air exit opening through as great a distance as possible.
Accordingly, in the embodiment of Figure 1, the casting mass introduction opening 53 is disposed about midway between the two air exit openings 57 and 59.
It is easily recognizable that the openings as described for the introduction of casting mass and for exiting air, respectively, may advantageously be form-ed at least in part integrally in the sheet material 31.
In that case, no special measures are necessary when lay-ing the sheet material around, in order to provide the openings in the proper location.
I-t will furthermore be noted that -the enclosure 27 surrounding the connec-tion area 29 under rubber-elastic elongation contiguously adapts itself throughout to the con-tour of the connection area, so that it is ensured tha-t only the absolutely necessary minimum amount of cast-ing mass will be consumed.
Figure 2 shows a sheet material 231 which is ~7Q45 on principle suited for the produetion of an enclosure according to the type of enclosure 27 shown in Figure 1. In the embodiment aceording to Figure 2, it is assumed that the parts 237a and 237b of the zipper 237 are formed integrally at the longitudinal edges of the sheet material 231. The sealing means 243 and 245 provided at the trans-verse edges and the hoses 261 and 263 plaeed therein as well as the eonnection piece 255 with the casting mass introduetion opening 253 are designed similar to the eor-responding parts of Figure 1. Insofar, reference is madeto the deseription of Figure 1.
Figure 3 shows an embodiment in which, similar to Figure 2, the quiek-aeting elosure means are provided in -the form of a zipper 337 at the longitudinal edges of the shee~ material 331. As a speeiality, provision is made for the quick-aeting elosure means to be ~ormed with a leak suited to vent the enelosure 327. Such a leak normally will result already when a zipper of the usual type is used for the quick-acting elosure means.
The leak, however, is not so great that when filling in the easting mass, disturbing amounts of excess cas-ting mass can exit through the quiek-aeting elosure means.
Suitably, in this embodiment, when making the eable con-neetion, -the quiek-aeting elosure means is arranged to be disposed on top, as shown in Figure 3. One may also restriet the venting to eertain areas of the quiek-aeting closure means by the provision of sealing means in other regions where air is not to exit, eomprising, for example, a marginal portion 40 of the sheet material effeetive as a sealing ledge 40 in aeeordanee with Figure 1. Figure
The present statement that the sheet material is capable of elastic elongation like rubber, is meant to say that ther~ is an expansibility as it is known from natural or synthetic rubber. Such an expansibility may be obtained in different ways; in the simplest case by making the foil part substantially entirely of rubber-elas-tic material. But other embodiments are also possible, in which only portions of the sheet material consist of rubber-elastic material capable of elongation, and/or in which a rubber-elastic expansibility is present predom-inantly or exclusively in the transverse direction only (in a radial direction with respect to the axis of the cable connection). In general, such embodiments will be preferred in which the sheet material consists substan-tially entirely of rubber-elastic material, because then the essential advantage obtained in accordance with the invention, i.e. the contiguously close covering of even irregular contours in the connection area, is afforded UIld;lllilliSI~d~ ~;U~ rre9U1.1r: COrll;OUrS 111aY LOLIII .;.11 ~.lrt.i-cular in connection o~ multiple core cables, in which block- or ball-like core connections arc distributed in the conne~tion area. With the aid of sheet mat~rials which are only flexible but not rubber-elastic, cylindri-cal connection areas at best may be smoothly covered on ~2(~7~S
all sides, but not connection areas of more complicated shape, such as double-conical or irregular connection areas.
The invention will be described in the following in more detail by way of examples of embodimen-t and in connection with the drawings, wherein BrieE Description of Drawings Figure 1 is a diagrammatic perspective view of a cable connection according to the invention with parts broken away; Figure 2 is a diagrammatic perspective representation of a sheet material suited for making the cable connection according to Figure l; Figure 3 is a view similar to Figure 1 showing a diagrammatic perspec-tive representation of another embodiment of a cable con-nection according to the invention; Figure 4 is a viewsimilar to Figure 2 showing a fractional diagrammatic perspective view of another embodiment of a sheet material for the production of a cable connection according -to the invention; Figure 5 is a diagrammatic perspective view corresponding to Figure 2 showing a different embo~i-ment of a sheet material suited to make the cable connec-tion according to the invention; Figure 6 is a diagram-matic perspective view of the inner surface of another embodiment of a sheet material suited for the production of a cable connection according to the invention; and Figures 7 to 11 are diagrammatic views of different stages during the production of a cable connection according to the invention.
Detailed Description Figures 2 to 11, parts occurring in a correspond-ing form in Figure 1 are designated with the same refer-ence numerals but with a number characterizing the respec-tive Figure placed in front. To avoid repeti-tions, in connection with such reference numerals, also Figure l and the apper-taining specification will always have to be referred to.
F-i.gure l shows an electric cable conncc~:i.on ~7Q4S
for connecting two electric cables 1, 3, each comprising a cable sheath S and 7, respectively, and three coxes.
In Figure 1, only the cores 9~ 11 and 13 of cable 1 are recognizable in the portion of the cable connection -that 5 has been broken away. The cores are connected to each other by core connections 15, 17, 19 which are surrounded by core connection insulations 21, 23, 25 and kept mutual-ly spaced from each other. The entire arrangement is surrounded by an enclosure 27 formed of flexible material 10 sealingly extending from cable sheath 5 to cable sheath 7 over the connection area 29, and comprising sheet mater-ial 31 laid around the cables, which is connected in it-self in two oppositely disposed longitudinal strip areas 33, 35 to form the enclosure 27. The connection is by 15 means of a zipper 37 which is closable in the usual manner by means of a slide 38. The longitudinal strip areas connected to each other are prererably provided along the longitudinal edges of the sheet material 31. In the embodiment shown in Figure 1, the longitudinal strip area 20 33 shown as the upper one in Figure 1 together with the s one part of the ~ e~ 37 is provided along one longi-tudinal edge of the sheet material 31, while the longitudi-nal strip area 35 shown as the lower one in Figure 1 to-gether with the second part of the zipper provided there 25 is arranged spaced through a distance from the adjacent longitudinal edge 39 of the sheet material 31, so ~hat in the condition of being laid around a sealing ledge 40 wlll form covering the closed zipper 37 from below and sealing the zipper 37 against the interior of the 30 enclosure 27.
The transverse edges 41, 42 of the sheet mater-ial 31 are provided with sealing means 43, 45 in the form of selE-sealing strips and thus are also sealed at -the cable sheaths 5 and 7, respectively. These sealing strips 35 may be fastened at the inner surface of the sheet ma-terial 31 or may be formed integrally with the sheet material 31.
12~7~4~
A castlng mass 47 capable of being cured is filled into the sleeve-shaped enclosure 27, which fills all the interstices and after curing will form a mechani-cally solid block. Provided between the sheet material 31 and the core connections 15, 17, 19 is a spacer material 49 wh-ch preferably consists of an open matting and is penetrated by the casting mass 47. For the usual multiple core low voltage cable connections, for instance, in 1 lV
household current supply mains and the like, a mat of an open matting having a thickness of 5 to 20 mm is suited which consists of loosely interconnected randomly oriented fibers of synthetic material having a diameter of about 0.5 mm. Suitable open mattings of polyamide or polyester fibers are commercially available.
The sheet material 31 is strongly rubber-elasti-cally extensible and, according to the embodiment of Figure 1, for this purpose, consists as a whole of a strongly extensible rubber-elastic material such as, for instance, neoprene or the like. Especially suited for cable connec-tions of the above mentioned type are sheets of a poly-chloroprene polymer having the following properties:
Shore hardness 36 Tensile strength ~MPa) 15.5 Elongation at break (%) 895 Breaking strength (N/mm) 26.
The zipper 37 shown in Figure 1 is a particular-ly simple and advantageous embodiment of a quick-acting connec-ting means which is adapted to be closed under a transverse tension. Other forms of such quick-acting closure means include, for instance, internegaging profile sections which may be hooked into each o-ther by means of a closure~slide, similar to a usual zipper. In each case i-t is necessary tha-t the quick-acting closure means closes, and preferably is also closable, while being under transverse tension because in the cable connection describ-ed, the enclosure 27 sits on the connection area while ~Z076~5 being elastically stretched. The sheet material 31 is dimensioned such that it can be closed about the conec-tion area 29 only under stretching and the zipper 37 is designed in such a manner that it can be pulled closed under a transverse tension. Thereby, the rubber-elastic sheet material 31 is stretc-hed and subjected to a tensile stress . The tensile stress may be considerable and is restricted only by the force available for pulling the zipper closed.
The filling-in o~ the casting mass 47 may on principle be carried out in any suitable manner, for in-stance, through an aperture in the enclosure 27 formed therein by piercing it with a syringe. Because of -the high stretching forces which are possible in the enclosure 27 it is, however, recomended to provide the sheet mater-ial 31 with a special casting mass introduction aperture 53 at a location remote from the edges thereof, which may easily be designed in such a manner that the shee-t material 31 will not rupture in that location. What is particularly advantageous is the formation thereof in a strength-enhancing connecting piece 55 which may easily be made in one piece with the sheet material 31 and which may, in addition, easily be designed for contac-ting with an injection nozzle of a casting mass injection apparatus (now shown).
The sheet material 31, suitably, has at least one air exit opening. In that case one does not have to rely on the air escaping through leaks, for example, of the quick-acting closing means (zipper 37) upon the casting mass being filled in, and can design the quick-act-ing closure means as well as also the seals 43, ~5 in such a manner tha-t a high degree of -tightness is ensured.
This is easily possible in connection with zippers in ~ we1 I-lcnown m~nncr in that the :inl:c~c~ 3~lcJillcJ clo(;;llrc sec-tions provided in -the longitudinal strip areas 33, 35 are formed as continuous ledges of synthetic material (not shown). Such ledges of synthetic material may, be-~L2~704~i sides, advantageously be formed at least in part integral-ly with the sheet material 31; this simplifies substantial-ly the production.
In the embodiment according to Figure 1, air exit openings 57, 59 are provided one each on either trans-verse edge 41, 42 of the sheet material 31. In both embod-iments shown, these openings are quite simply formed by hoses 61 and 63, respectively, which are passing through the sealing means 43 and 45, respectively, or are simply fixed by an adhesive to the inner surface of the sealing means, or are inserted below the sealing means when the sheet material 31 is laid around. This known-per-se tech-nique is very simple and enables a safe predication as to when the cable connection is completely filled with the casting mass; in that case, excess casting mass will exit from both air exit openings 57 and 59. So that the casting mass will exit only after the filling of the enclo-sure 27 has been completed, it is to the purpose to arrange the casting mass introduction opening 53 spaced from the air exit opening through as great a distance as possible.
Accordingly, in the embodiment of Figure 1, the casting mass introduction opening 53 is disposed about midway between the two air exit openings 57 and 59.
It is easily recognizable that the openings as described for the introduction of casting mass and for exiting air, respectively, may advantageously be form-ed at least in part integrally in the sheet material 31.
In that case, no special measures are necessary when lay-ing the sheet material around, in order to provide the openings in the proper location.
I-t will furthermore be noted that -the enclosure 27 surrounding the connec-tion area 29 under rubber-elastic elongation contiguously adapts itself throughout to the con-tour of the connection area, so that it is ensured tha-t only the absolutely necessary minimum amount of cast-ing mass will be consumed.
Figure 2 shows a sheet material 231 which is ~7Q45 on principle suited for the produetion of an enclosure according to the type of enclosure 27 shown in Figure 1. In the embodiment aceording to Figure 2, it is assumed that the parts 237a and 237b of the zipper 237 are formed integrally at the longitudinal edges of the sheet material 231. The sealing means 243 and 245 provided at the trans-verse edges and the hoses 261 and 263 plaeed therein as well as the eonnection piece 255 with the casting mass introduetion opening 253 are designed similar to the eor-responding parts of Figure 1. Insofar, reference is madeto the deseription of Figure 1.
Figure 3 shows an embodiment in which, similar to Figure 2, the quiek-aeting elosure means are provided in -the form of a zipper 337 at the longitudinal edges of the shee~ material 331. As a speeiality, provision is made for the quick-aeting elosure means to be ~ormed with a leak suited to vent the enelosure 327. Such a leak normally will result already when a zipper of the usual type is used for the quick-acting elosure means.
The leak, however, is not so great that when filling in the easting mass, disturbing amounts of excess cas-ting mass can exit through the quiek-aeting elosure means.
Suitably, in this embodiment, when making the eable con-neetion, -the quiek-aeting elosure means is arranged to be disposed on top, as shown in Figure 3. One may also restriet the venting to eertain areas of the quiek-aeting closure means by the provision of sealing means in other regions where air is not to exit, eomprising, for example, a marginal portion 40 of the sheet material effeetive as a sealing ledge 40 in aeeordanee with Figure 1. Figure
3 shows that the quiek-aeting elosure means 337 are extend-ecl in a curvecl line around l:he casl:-in~ 111.1.~!:; inlro~ cliol-l opening 353 which is likewise to be arranged on top during -the produc-tion of the cable conneetion. In the embodiment aecording to Figure 3 the easting mass introduction opening 353 is provided in a filling chute 355 into which the casting mass is poured pressureless. In the embodimen-t :1~07Q9~i shown, comprising a leak suited for venting in the quick-acting closure means 337, the construction of the sheet material 331 is evidently especially simple, so that the production is particularly easily possible. As may readily be seen, one may also form a casting mass introduction opening by leaving a small opening in the process of c~os-ing the quick-acting closure means. Thereby, the sheet material is even simpler. However, the proper dimensioning of the portion to be left open calls for a certain degree of care; in general, one will therefore prefer embodiments in which the quick-acting closure means are pulled entire-ly closed and in which a special casting mass introduction opening is provided.
It goes without saying that the quick-acting closure means may also be provided to be present in sever-al portions. So, for instance, a zipper may be used tha-t can be pulled closed from both ends by means of a closure slide.
Figure 4 illustrates the possibility of fixedly arranging the spacer material 449 on the inner surface of the sheet material 431. This facilitates the produc-tion of the cable connection.
Figure 5 shows a sheet material 531 in which a casting mass introduction opening 553 is arranged in ~5 an elongated connecting piece 555 midway between two air exit openings 557 and 559. The latter are provided near the -transverse edges and the sealing means 543, 545 provid-ed there, in venting pipes 67, 69. It is easily possible to provide in the connecting pieces closure means, valves or the like such as a check valve (not shown) in the con-necting piece 555 of the casting mass in-troduction opening 553. In the case of the embodiment shown, the connecting pieces 555, -67 and 63 are formed as separate members and ara welded to the sheet material 531 or adhesively connect-ed thereto. To ~nhance the strength one will then suit-ably select for the connection pieces a somewhat harder ma-terial, for example, a polychloroprene polymer having the following properties:
:~Z(~7~S
Shore hardness 70 Tensile strength (MPa) 15 Elongation at break (%) 300 Breaking strength (N/mm) 33.
Figure 6 shows a sheet material 631 provided with knubs 649 on the inner surface thereof. These knubs are effective as spacing material ensuring a certain dis-tance from the core connections. The knubs may also easily be formed integrally with the sheet material 631 during production thereof. In the embodiment shown, the ~nubs 649 are desiyned substantially to be cylindrical and are regularly distributed in rows, more specifically, in longi-tudinal rows. It has been found that thereby the rubber type elasticity of the material of the sheet material 15 631 is least impaired by the knubs 649. In Figure 6 it can be seen that with this embodiment the sealing means 643, 645 are provided in the form of ledges at the trans-verse edges of the sheet material 631, and that similar to the embodiment of Figure 5, connection pieces 655, 20 667 and 669 are provided whi-h are formed as separa-te constructional members and connected to the sheet material 631 afterwards; these connection pieces contain the cast-ing mass introduction opening 633 and the air exit open-ings 657 and 659, respectively.
Figures 7 to 11 illustrate the production of a cable connection between two multiple core cables 701, 703 with a sheet mateiral 731 of the type shown in Figure 5O A separate spacer material 749 is utilized in the form of an open matting of an approximately dovetail-shap-ed outl:Lne, so that the matting has a web portion 71 and two wing portions 73, 75. According to Figure 7 the web portion 71 o~ the spacer material 749 is first laid around the core connections which have been completed and insulat-ed before, such as the core connection 717, for example.
This done, the wings (Figure 8) 73, 75 are also laid a-round the core connections. The wrapper 77 thus ~ormed ~2a 7Q4S
(Figure 9) may be temporarily held together by means of clamps or the like~ Thereupon, a sheet material 731 is laid around the connection area 729. At the longitudinal edges 733, 735 of the sheet material 731, portions of a zipper 737 are provided. A closure slide 738 of the zipper is arranged on the zipper portion of -the longitudi-nal edge 735. The sheet material 731 is laid around the connection area 729 in such a manner that it extends from cable sheath 705 to cable sheath 707, and the slide of the zipper 737 is h,ooked-in at the one end of the zipper (Figure 10~ while stretchingly pulling the sheet material 731 around, and pulled closed (Figure 11). In so doing, the sheet material is extended, and the sheet material is sealed to the cable sheaths 705, 707 along the trans-verse edges thereof by means of the sealing means 743,7~5 provided thereat. Thereupon, a casting mass is filled into the casting mass introduction opening 753, and the air displaced during the operation of filling-in may es-cape through the air exit openings 757 and 759. In any case, the casting mass is introduced at a pressure insuffi-cient to substantially inflate the enclosure 731. After curing the casting mass the cable connection is finished~
It will be noted -that the essential steps of the process described consist in that a sheet material of strongly expansible rubber~elastic material is closed on the connection area and around it while being subjected to elongation by means of quick-acting closure means clos-able under a transverse tension, preferably in the form of a zipper, and thereupon the casting mass is introduced at a pressure insufficient to substantially inflate the enclosure. As has already been explained before, -the quick-acting-closure means may in general be provided in oppositely disposed strip-shaped areas, preferably marginal areas, of the sheet material 731 that has been laid around.
If a sheet material is utilized that does not ~2070~5 adhere to the casting mass, the sheet material may lie removed after the casting mass has been cured. This is made possible by using a sheet material which is free of spacer material fastened thereto and is provided on the inner surface thereof with a release material prevent-ing the casting mass from sticking thereto. As a separa-tion material, silicone grease may be used.
The making of the cable connection according to the invention may be rendered particularly simple by the provision of a prefabricated kit of constructional members for the production of the cable connection, com-prising all the necessary parts, i.e. especially a rubber-elastic sheet material suited for the respective t:ype of cable connection.
It goes without saying that the quick-acting closure means may also be provided to be present in sever-al portions. So, for instance, a zipper may be used tha-t can be pulled closed from both ends by means of a closure slide.
Figure 4 illustrates the possibility of fixedly arranging the spacer material 449 on the inner surface of the sheet material 431. This facilitates the produc-tion of the cable connection.
Figure 5 shows a sheet material 531 in which a casting mass introduction opening 553 is arranged in ~5 an elongated connecting piece 555 midway between two air exit openings 557 and 559. The latter are provided near the -transverse edges and the sealing means 543, 545 provid-ed there, in venting pipes 67, 69. It is easily possible to provide in the connecting pieces closure means, valves or the like such as a check valve (not shown) in the con-necting piece 555 of the casting mass in-troduction opening 553. In the case of the embodiment shown, the connecting pieces 555, -67 and 63 are formed as separate members and ara welded to the sheet material 531 or adhesively connect-ed thereto. To ~nhance the strength one will then suit-ably select for the connection pieces a somewhat harder ma-terial, for example, a polychloroprene polymer having the following properties:
:~Z(~7~S
Shore hardness 70 Tensile strength (MPa) 15 Elongation at break (%) 300 Breaking strength (N/mm) 33.
Figure 6 shows a sheet material 631 provided with knubs 649 on the inner surface thereof. These knubs are effective as spacing material ensuring a certain dis-tance from the core connections. The knubs may also easily be formed integrally with the sheet material 631 during production thereof. In the embodiment shown, the ~nubs 649 are desiyned substantially to be cylindrical and are regularly distributed in rows, more specifically, in longi-tudinal rows. It has been found that thereby the rubber type elasticity of the material of the sheet material 15 631 is least impaired by the knubs 649. In Figure 6 it can be seen that with this embodiment the sealing means 643, 645 are provided in the form of ledges at the trans-verse edges of the sheet material 631, and that similar to the embodiment of Figure 5, connection pieces 655, 20 667 and 669 are provided whi-h are formed as separa-te constructional members and connected to the sheet material 631 afterwards; these connection pieces contain the cast-ing mass introduction opening 633 and the air exit open-ings 657 and 659, respectively.
Figures 7 to 11 illustrate the production of a cable connection between two multiple core cables 701, 703 with a sheet mateiral 731 of the type shown in Figure 5O A separate spacer material 749 is utilized in the form of an open matting of an approximately dovetail-shap-ed outl:Lne, so that the matting has a web portion 71 and two wing portions 73, 75. According to Figure 7 the web portion 71 o~ the spacer material 749 is first laid around the core connections which have been completed and insulat-ed before, such as the core connection 717, for example.
This done, the wings (Figure 8) 73, 75 are also laid a-round the core connections. The wrapper 77 thus ~ormed ~2a 7Q4S
(Figure 9) may be temporarily held together by means of clamps or the like~ Thereupon, a sheet material 731 is laid around the connection area 729. At the longitudinal edges 733, 735 of the sheet material 731, portions of a zipper 737 are provided. A closure slide 738 of the zipper is arranged on the zipper portion of -the longitudi-nal edge 735. The sheet material 731 is laid around the connection area 729 in such a manner that it extends from cable sheath 705 to cable sheath 707, and the slide of the zipper 737 is h,ooked-in at the one end of the zipper (Figure 10~ while stretchingly pulling the sheet material 731 around, and pulled closed (Figure 11). In so doing, the sheet material is extended, and the sheet material is sealed to the cable sheaths 705, 707 along the trans-verse edges thereof by means of the sealing means 743,7~5 provided thereat. Thereupon, a casting mass is filled into the casting mass introduction opening 753, and the air displaced during the operation of filling-in may es-cape through the air exit openings 757 and 759. In any case, the casting mass is introduced at a pressure insuffi-cient to substantially inflate the enclosure 731. After curing the casting mass the cable connection is finished~
It will be noted -that the essential steps of the process described consist in that a sheet material of strongly expansible rubber~elastic material is closed on the connection area and around it while being subjected to elongation by means of quick-acting closure means clos-able under a transverse tension, preferably in the form of a zipper, and thereupon the casting mass is introduced at a pressure insufficient to substantially inflate the enclosure. As has already been explained before, -the quick-acting-closure means may in general be provided in oppositely disposed strip-shaped areas, preferably marginal areas, of the sheet material 731 that has been laid around.
If a sheet material is utilized that does not ~2070~5 adhere to the casting mass, the sheet material may lie removed after the casting mass has been cured. This is made possible by using a sheet material which is free of spacer material fastened thereto and is provided on the inner surface thereof with a release material prevent-ing the casting mass from sticking thereto. As a separa-tion material, silicone grease may be used.
The making of the cable connection according to the invention may be rendered particularly simple by the provision of a prefabricated kit of constructional members for the production of the cable connection, com-prising all the necessary parts, i.e. especially a rubber-elastic sheet material suited for the respective t:ype of cable connection.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electric cable connection, especially for low and medium voltage electricity supply networks, in a connection area between at least two electrical cables each having at least one core and a cable sheath, the cable connection comprising a core connection which preferably is provided with a core connection insulation, an enclosure formed of flexible material extending sealingly from cable sheath to cable sheath over the connection area and having a sheet material laid around the cables, said sheet material having oppositely disposed interconnected longitu-dinal strip areas preferably along longitudinal edges of the sheet material and transverse edges lying in close contact against the cable sheaths, said transverse edges being preferably provided with sealing means, and a casting mass filled into the enclosure, with a spacer material preferably provided between the sheet material and the core connection, which is permeated by the cast-ing material and preferably fixedly attached to the inner surface of the sheet material, characterized in that the sheet material is strongly stretchable rubber-elastic, and is dimensioned so that it can be closed around the connection area only when stretched, and in that the longitudinal strip areas of the sheet material are provided with quick-action closure means closing under transverse tension.
2. A cable connection according to claim 1, characterized in that the quick-action closure means comprise a zipper.
3. A cable connection according to claim 1 or 2, character-ized in that the quick-action closure means are designed with a leak suited to vent the enclosure.
4. A cable connection according to claim 1 or 2, character-ized in that the sheet material is provided with a casting mass introduction opening.
5. A process for the production of a cable connection, especially for low and medium voltage current supply networks, in a connection area between two electrical cables each comprising at least one core and one cable sheath, said process comprising the following steps:
a) making a core connection and preferably insulating same, b) laying a sheet material around the connection area from cable sheath to cable sheath, if desired or required) with the interposition of a spacer material which is adapted to be perme-ated by the casting mass, c) sealing the sheet material at the cable sheaths, prefer-ably by means of sealing means provided on the sheet material, d) forming an essentially closed enclosure by interconnecting oppositely disposed strip-like areas, preferably marginal areas, of the sheet material laid around, e) introducing a curable casting mass into the enclosure until it is completely filled, and f) curing the casting mass, characterized in that the enclosure is formed by g) providing the sheet material as a sheet of strongly rub-ber-elastic material and closing it on and about the connection area while being subjected to elongation by means of quick-action closure means adapted to be closed under a transverse tension, preferably in the form of a zipper, and h) introducing the casting mass at a pressure insuffi-cient to substantially inflate the enclosure.
a) making a core connection and preferably insulating same, b) laying a sheet material around the connection area from cable sheath to cable sheath, if desired or required) with the interposition of a spacer material which is adapted to be perme-ated by the casting mass, c) sealing the sheet material at the cable sheaths, prefer-ably by means of sealing means provided on the sheet material, d) forming an essentially closed enclosure by interconnecting oppositely disposed strip-like areas, preferably marginal areas, of the sheet material laid around, e) introducing a curable casting mass into the enclosure until it is completely filled, and f) curing the casting mass, characterized in that the enclosure is formed by g) providing the sheet material as a sheet of strongly rub-ber-elastic material and closing it on and about the connection area while being subjected to elongation by means of quick-action closure means adapted to be closed under a transverse tension, preferably in the form of a zipper, and h) introducing the casting mass at a pressure insuffi-cient to substantially inflate the enclosure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3216431.9 | 1982-05-03 | ||
| DE3216431A DE3216431C2 (en) | 1982-05-03 | 1982-05-03 | Electrical cable connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1207045A true CA1207045A (en) | 1986-07-02 |
Family
ID=6162536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425883A Expired CA1207045A (en) | 1982-05-03 | 1983-04-14 | Electric cable connection with quick action closure |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS58204712A (en) |
| AR (1) | AR230902A1 (en) |
| AU (1) | AU561267B2 (en) |
| BE (1) | BE896632A (en) |
| BR (1) | BR8302256A (en) |
| CA (1) | CA1207045A (en) |
| CH (1) | CH662014A5 (en) |
| DE (1) | DE3216431C2 (en) |
| ES (1) | ES521962A0 (en) |
| FR (1) | FR2526233B1 (en) |
| GB (1) | GB2122037B (en) |
| IT (1) | IT1197639B (en) |
| NL (1) | NL190346C (en) |
| NZ (1) | NZ204059A (en) |
| SE (1) | SE455976B (en) |
| ZA (1) | ZA833108B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62198819U (en) * | 1986-06-05 | 1987-12-17 | ||
| ES2152489T3 (en) * | 1995-01-17 | 2001-02-01 | Thomas & Betts Corp | CABLE CONNECTION BOX WITH PRESSURE COATING AND CONTAINER FOR OUTGOING COATING MATERIAL. |
| DE19519367A1 (en) * | 1995-05-26 | 1996-11-28 | Cellpack Gmbh | Mfr of cast resin sleeves for insulated branched electric cables |
| FR2982434B1 (en) * | 2011-11-07 | 2014-10-10 | Soc Ind De Construction Dappareils Et De Materiel Electriques | ENVELOPMENT FOR ENCAPSULATING A CABLE CONNECTING AREA AND A CABLE NODE AND NODE COMPRISING THE SAME |
| FR3001347B1 (en) * | 2013-01-18 | 2016-06-24 | Franck Vivona | INJECTION COVER FOR ACCESSORIES FOR CONNECTING ELECTRIC CABLES |
| DE102013101601B4 (en) * | 2013-02-18 | 2014-12-31 | Sick Ag | Cable fixing for sensor housing |
| US11855422B2 (en) * | 2018-10-12 | 2023-12-26 | Eaton Intelligent Power Limited | Cable gland including internal dam |
| CN110518428A (en) * | 2019-08-28 | 2019-11-29 | 中复碳芯电缆科技有限公司 | A kind of production method of the lightning protected cable connector applied to wind electricity blade |
| NL2025550B1 (en) * | 2020-05-11 | 2021-11-25 | Filoform Bv | Method and prefabricated sealing assembly for sealing an electric cable joint |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2756172A (en) * | 1954-03-05 | 1956-07-24 | Alexander C Kidd | Pipe coverings |
| US2967795A (en) * | 1955-10-18 | 1961-01-10 | Minnesota Mining & Mfg | Protection of wire-splices |
| US3038558A (en) * | 1959-03-24 | 1962-06-12 | Walter A Plummer | Protective jacket |
| US3187090A (en) * | 1961-01-03 | 1965-06-01 | Plummer Walter A | Cable splicing boots |
| US3419669A (en) * | 1965-03-15 | 1968-12-31 | Minnesota Mining & Mfg | Flexible mold and cable splice |
| US3495026A (en) * | 1968-05-16 | 1970-02-10 | Plummer Walter A | Cable splice boot |
| FR2231137A1 (en) * | 1974-04-02 | 1974-12-20 | Zippertubing Co | Protective insulating sheath for electric cables - uses foamed material inserted into tube with slide fastening |
-
1982
- 1982-05-03 DE DE3216431A patent/DE3216431C2/en not_active Expired
-
1983
- 1983-04-14 CA CA000425883A patent/CA1207045A/en not_active Expired
- 1983-04-27 NL NLAANVRAGE8301488,A patent/NL190346C/en not_active IP Right Cessation
- 1983-04-29 CH CH2330/83A patent/CH662014A5/en not_active IP Right Cessation
- 1983-04-29 NZ NZ204059A patent/NZ204059A/en unknown
- 1983-04-29 SE SE8302428A patent/SE455976B/en not_active IP Right Cessation
- 1983-04-29 GB GB08311841A patent/GB2122037B/en not_active Expired
- 1983-04-29 ES ES521962A patent/ES521962A0/en active Granted
- 1983-05-02 FR FR8307246A patent/FR2526233B1/en not_active Expired
- 1983-05-02 BE BE0/210674A patent/BE896632A/en not_active IP Right Cessation
- 1983-05-02 AU AU14134/83A patent/AU561267B2/en not_active Ceased
- 1983-05-02 ZA ZA833108A patent/ZA833108B/en unknown
- 1983-05-02 JP JP58078120A patent/JPS58204712A/en active Granted
- 1983-05-02 BR BR8302256A patent/BR8302256A/en not_active IP Right Cessation
- 1983-05-02 IT IT48195/83A patent/IT1197639B/en active
- 1983-05-02 AR AR292900A patent/AR230902A1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| SE8302428L (en) | 1983-11-04 |
| NL190346C (en) | 1994-01-17 |
| JPS58204712A (en) | 1983-11-29 |
| ES8405563A1 (en) | 1984-06-01 |
| ES521962A0 (en) | 1984-06-01 |
| AR230902A1 (en) | 1984-07-31 |
| GB2122037A (en) | 1984-01-04 |
| DE3216431C2 (en) | 1984-02-02 |
| JPH0410295B2 (en) | 1992-02-24 |
| NL190346B (en) | 1993-08-16 |
| CH662014A5 (en) | 1987-08-31 |
| NL8301488A (en) | 1983-12-01 |
| SE455976B (en) | 1988-08-22 |
| GB2122037B (en) | 1985-11-27 |
| BR8302256A (en) | 1984-01-03 |
| FR2526233B1 (en) | 1987-01-09 |
| ZA833108B (en) | 1984-03-28 |
| FR2526233A1 (en) | 1983-11-04 |
| GB8311841D0 (en) | 1983-06-02 |
| AU1413483A (en) | 1983-11-10 |
| NZ204059A (en) | 1986-01-24 |
| AU561267B2 (en) | 1987-05-07 |
| BE896632A (en) | 1983-11-03 |
| DE3216431A1 (en) | 1983-11-03 |
| IT8348195A0 (en) | 1983-05-02 |
| SE8302428D0 (en) | 1983-04-29 |
| IT1197639B (en) | 1988-12-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |