US3678175A - Deformable casing joining cable ends - Google Patents

Deformable casing joining cable ends Download PDF

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Publication number
US3678175A
US3678175A US85469A US3678175DA US3678175A US 3678175 A US3678175 A US 3678175A US 85469 A US85469 A US 85469A US 3678175D A US3678175D A US 3678175DA US 3678175 A US3678175 A US 3678175A
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United States
Prior art keywords
joint
casing
set forth
cable
central portion
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Expired - Lifetime
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US85469A
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English (en)
Inventor
Edoardo Appiani
Alberto Felici
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Pirelli and C SpA
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Pirelli SpA
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Assigned to SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY reassignment SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INDUSTRIE PIRELLI S.P.A.
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Expired - Lifetime legal-status Critical Current

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    • 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
    • H02G15/113—Boxes split longitudinally in main cable direction

Definitions

  • ABSTRACT Casing for protecting joined cable ends surrounded by variable volume insulation which is of maximum cross-section at its center and tapers to a smaller size at its ends and which has longitudinally extending corrugations to permit it to expand and contract and thereby follow the volume variations of the insulation.
  • the present invention concerns an improved casing for restoring the-continuity of the sheath of a power or control cable and is installed over an insulated cable joint protected with insulating compositions which vary their volume, in consequence of thermal or chemical-physicalactions, from the moment of the joint installation to its coming into service.
  • the casing by varying its shape, follows the volume variations of said insulating compositions.
  • the cable insulation is protected with an insulating composition supplied to the interior of the casing through a suitable pouring inlet.
  • Insulating compositions of various kinds in particular, hotpouring or cold-pouring compositions, are used for this purpose.
  • Hot-pouring compositions which at room temperature are in a solid or highly viscous state, must be fluidized by heating in order to permit pouring thereof and to cause it to penetrate into all recesses of the casing, as well as to permit an easy filling of the latter. After its pouring, the compositions cools and consequently shrinks.
  • the cooling for the most widely used compositions, is carried out for a time period variable as a function of the involved volumes and of the physical characteristics of the material and in any case, it lasts several hours.
  • the interior of the casing must remain accessible for refilling purposes, which is intended to eliminate mainly the space left free within the casing after shrinkage of the composition in order to avoid, inside the joint when in service, the presence of undesired air bubbles or hollow spaces, which would impair the performance of the joint and hence, the cable.
  • cold-pouring insulating compositions are used for filling the casing, these undergo an exothermic reaction, so that initially they beat up and expand, and after the reaction, the poured composition cools and consequently shrinks.
  • the present invention aims at providing'an improved casing for power and control cables having conductive or insulating sheaths, which obviates the above indicated disadvantages and does not require refilling operations, or other operations required by the need of eliminating air bubbles or hollow spaces inside the joint in the time interval between the initial installation and the coming into service of joints prepared with insulating compositions subject to volume variations due to thermal or chemical-physical actions.
  • the object of the present invention is an improved casing for restoring the continuity of the covering sheath of a power or control cable over a joint protected with insulating compositions subject to volume variations from the moment of the joint installation to its coming into service,
  • the body of said casing is at least partially provided with longitudinal corrugations able to facilitate and to orient its deformation and its consequent variation of capacity, the median longitudinal section of said body having a main central portion of maximum transverse size and two lateral portions tapered to a size slightly greater than the size of the sheaths of the two joined cable lengths.
  • FIG. 1 is a side elevation view of a preferred embodiment of the casing according to the invention assembled on the joint of a cable having a metallic covering sheath;
  • FIG. 2 is the cross-sectional view taken along the line A--A indicated in FIG. 1 before the insulating composition of the hot-pouring type is poured into it;
  • FIG. 3 represents the same cross-section shown in FIG. 2, after the pouring and the shrinkage of the hot-pouring insulating composition.
  • the two cable lengths l0 and 10" are connected by means of a joint enclosed within the casing 14, whose body is preferably made of lead or of another conductive material, and is secured to the metal sheaths of the cable lengths l0 and 10" by welds 12, 12" at the casing end openings l3, 13'', respectively.
  • the casing 14 is constituted by two half-shellsl4' and 14", respectively, a lower one and anupper one.
  • the lower halfshell 14 is provided on its longitudinal edges with two L- shaped seats 15' and 15" (see FIGS. 2 and 3), the inner por tions of which receive, during the assembling, the corresponding edges 16, 16" of the upper half-shell 14".
  • a pouring inlet 17, provided with a lid 18, is provided in the central portion of the half-shell 14".
  • the two half-shells 14' and 14" are secured together by welds l9 and 19', such as, lead or solder, effected along the longitudinal contact zones between the seats 15' and 15" and the edges 16' and 16'.
  • the body of the casing 14 can be divided longitudinally into three positions, namely: a main central portion 20 of substan tially rectangular shape, as viewed from the side, and two oppositely tapered lateral portions 21' and 21" of trapezoidal shape, the smaller bases of which are slightly greater than the diameter of the metallic sheaths covering the two cable lengths to be joined.
  • the main central portion 20 can be inscribed in a cylinder, and the two lateral portions 21' and 21" can be inscribed in truncated cones tapered towards their corresponding entry openings 13 and 13".
  • the body of the casing 14 is provided with longitudinal corrugations 22 which extend along the whole main central portion 20 and are prolonged at 22 and 22" in the lateral por-v tions 21 and 21" along the generatrices of the corresponding circurmcribed frustum of cone, but interrupted at a predetermined distance from the two openings 13 and 13".
  • an insulating composition solid at room temperature
  • an insulating composition solid at room temperature
  • the casing is tightly closed with the lid 18, sealed at 23, and at this time, normal conditions can be reestablished inside the joint between the two cable lengths l0 and 10" by carrying out further operations outside the joint, such as by closing the trench immediately afterwards.
  • the composition cools, with corresponding shrinkage, and creates a depression inside the tightly closed casing.
  • the composition is poured, as described above, until the composition overflows the casing with respect to the pouring inlet 17; then, the lid 18 is closed and tightly sealed at 23.
  • the exothermic reaction which takes place in the insulating composition causes an initial expansion which, acting on the corrugated walls, increases the capacity of the casing and equalizes it to the volume of the therein contained insulating composition.
  • the reaction is over, the insulating composition begins to cool and to shrink, and this variation is followed by the casing wall subjected to the outer atmospheric pressure.
  • the conductive or insulating casing could be built up with a different number of sections or with differently located joints between sections and the longitudinal corrugations could be discontinuous or alternate or could be formed of combinations of channels and projections different from the regular, sinusoidal corrugations illustrated by way of example.
  • the cross-section of the theoretical area in which the portions of the casing are circumscribed could be other than circular. Another form is, for example, an ellipse or a polygon.
  • An electric cable joint between a pair of cable sections said cable sections each having a conductor surrounded by a sheath and said joint comprising an interconnection between the conductors of said sections, a casing enclosing said interconnection and extending longitudinally of said joint from the sheath of one cable section to the sheath of the other cable section, said casing being substantially unbroken in the longitudinal direction and comprising a hollow central portion of maximum cross-section greater than that of the sheaths of said sections and that of said interconnection, and at opposite ends thereof, having a pair of hollow, tapered, end portions forming a continuation thereof, each end portion having an end opening smaller than the cross-section of said central portion and each surrounding and joined to one of the sheaths of a cable section, and void-free solid insulation within said casing and surrounding said interconnected cable sections, said casing being in complete contact with said insulation with no void spaces therebetween, said casing being provided with a plurality of longitudinally extending corrugations disposed peripherally of at least said
  • corrugations extend the full length of said central portion and along at least part of the lengths of said end portions.
  • a joint as set forth in claim 1 which comprises a plurality of parts which interconnect along longitudinally extending seams.
  • a joint as set forth in claim 8 which comprises a further opening in one of said portions and a cover for said further opening.

Landscapes

  • Cable Accessories (AREA)
  • Insulated Conductors (AREA)
  • Sealing Material Composition (AREA)
  • Gasket Seals (AREA)
US85469A 1969-12-09 1970-10-30 Deformable casing joining cable ends Expired - Lifetime US3678175A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2550169 1969-12-09

Publications (1)

Publication Number Publication Date
US3678175A true US3678175A (en) 1972-07-18

Family

ID=11216883

Family Applications (1)

Application Number Title Priority Date Filing Date
US85469A Expired - Lifetime US3678175A (en) 1969-12-09 1970-10-30 Deformable casing joining cable ends

Country Status (5)

Country Link
US (1) US3678175A (enrdf_load_stackoverflow)
DE (1) DE2059667A1 (enrdf_load_stackoverflow)
ES (1) ES164260Y (enrdf_load_stackoverflow)
FR (1) FR2072211A5 (enrdf_load_stackoverflow)
GB (1) GB1295723A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885087A (en) * 1973-07-17 1975-05-20 Fujikura Ltd Air tight dam for communication cables
US3903595A (en) * 1973-07-17 1975-09-09 Fujikura Ltd Method of forming an air tight dam for communication cables
US4032380A (en) * 1973-04-13 1977-06-28 Telefonaktiebolaget L M Ericsson Method of joining of insulated high-voltage cables
US4166920A (en) * 1976-07-21 1979-09-04 Felten & Guilleaume Carlswerk Aktiengesellschaft Multi-section internally cooled high-voltage high-energy cable and a method of manufacturing the same
US4736071A (en) * 1986-03-17 1988-04-05 American Telephone And Telegraph Company, At&T Bell Laboratories Encapsulation system with pressurization means
US4859809A (en) * 1988-04-27 1989-08-22 Raychem Corporation Splice case
US5111001A (en) * 1990-04-13 1992-05-05 Raychem Corporation Splice case
CN103170044A (zh) * 2011-12-22 2013-06-26 通用电气公司 用于流体管的设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19742078A1 (de) * 1997-09-24 1999-04-08 Cit Alcatel Kabelmuffe mit einer den Spleiß umhüllenden Einlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB397539A (en) * 1932-02-23 1933-08-23 Siemens Brothers & Co Ltd Improvements in or relating to electric cable systems

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB397539A (en) * 1932-02-23 1933-08-23 Siemens Brothers & Co Ltd Improvements in or relating to electric cable systems

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032380A (en) * 1973-04-13 1977-06-28 Telefonaktiebolaget L M Ericsson Method of joining of insulated high-voltage cables
US3885087A (en) * 1973-07-17 1975-05-20 Fujikura Ltd Air tight dam for communication cables
US3903595A (en) * 1973-07-17 1975-09-09 Fujikura Ltd Method of forming an air tight dam for communication cables
US4166920A (en) * 1976-07-21 1979-09-04 Felten & Guilleaume Carlswerk Aktiengesellschaft Multi-section internally cooled high-voltage high-energy cable and a method of manufacturing the same
US4736071A (en) * 1986-03-17 1988-04-05 American Telephone And Telegraph Company, At&T Bell Laboratories Encapsulation system with pressurization means
US4859809A (en) * 1988-04-27 1989-08-22 Raychem Corporation Splice case
US5111001A (en) * 1990-04-13 1992-05-05 Raychem Corporation Splice case
CN103170044A (zh) * 2011-12-22 2013-06-26 通用电气公司 用于流体管的设备
US20130160888A1 (en) * 2011-12-22 2013-06-27 General Electric Company Apparatus for fluid tube
US8826943B2 (en) * 2011-12-22 2014-09-09 Carefusion Corporation Apparatus for fluid tube
US9283345B2 (en) 2011-12-22 2016-03-15 Carefusion Corporation Apparatus for fluid tube
US9555208B2 (en) 2011-12-22 2017-01-31 Vyaire Medical Consumables Llc Apparatus for fluid tube
US9884161B2 (en) 2011-12-22 2018-02-06 Vyaire Medical Consumables Llc Apparatus for fluid tube
US10688267B2 (en) 2011-12-22 2020-06-23 Vyaire Medical Consumables Llc Apparatus for fluid tube

Also Published As

Publication number Publication date
DE2059667A1 (de) 1971-06-09
ES164260Y (es) 1971-09-01
ES164260U (es) 1971-02-16
FR2072211A5 (enrdf_load_stackoverflow) 1971-09-24
GB1295723A (enrdf_load_stackoverflow) 1972-11-08

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SOCIETA PIRELLI S.P.A., PIAZZALE CADORNA 5, 20123

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INDUSTRIE PIRELLI S.P.A.;REEL/FRAME:003847/0084

Effective date: 19810101