WO1998021799A1 - Joint d'obturateur de cables pour obturation de type pince - Google Patents

Joint d'obturateur de cables pour obturation de type pince Download PDF

Info

Publication number
WO1998021799A1
WO1998021799A1 PCT/US1997/004047 US9704047W WO9821799A1 WO 1998021799 A1 WO1998021799 A1 WO 1998021799A1 US 9704047 W US9704047 W US 9704047W WO 9821799 A1 WO9821799 A1 WO 9821799A1
Authority
WO
WIPO (PCT)
Prior art keywords
end seal
port
cable
portions
inner circumferential
Prior art date
Application number
PCT/US1997/004047
Other languages
English (en)
Inventor
James R. Miller
Original Assignee
Minnesota Mining And Manufacturing Company
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minnesota Mining And Manufacturing Company filed Critical Minnesota Mining And Manufacturing Company
Priority to AU23261/97A priority Critical patent/AU2326197A/en
Publication of WO1998021799A1 publication Critical patent/WO1998021799A1/fr

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
    • H02G15/013—Sealing means for cable inlets

Definitions

  • This invention relates generally to a cable-closure end seal and more particularly to a clamp type end seal for use in sealing the area at the end of a closure, or terminal, through which cables are positioned, and sealing the area about the cables to restrict moisture or other contamination from entering the closure.
  • An enclosure or a closure body is used to sealingly surround the splice.
  • One persistent problem in the use of splice closures involves the need for a complete seal about the splice or closure body.
  • Many prior art splice closures accomplish sealing by providing a complex array of nuts and bolts, clamps, gaskets and heat shrink tubing, as well as potting gels and resins, in various combinations.
  • these closure methods require significant assembly time, the closures still often suffer leaks or ruptures, particularly along their seals. This problem is even more acute at the sealing of the closure to the cable jacket, where even the slightest defect can result in the migration of moisture along the jacket or the inner surface of the closure.
  • a lack of a complete (hermetic) seal can also be particularly detrimental for pressurized closures.
  • these seals may be strengthened by the use of adhesives, the adhesive bonds formed are normally relatively weak due to the low surface energy of the material of the closure and cables, typically polyethylene.
  • thermoplastic polymers such as polyethylene
  • fusion bonding This technique generally involves the heating of the material until it becomes molten at its sealing surfaces, causing it to flow together at the interfaces, and can be used for butt welds, coupling joints and repair sleeves
  • direct heating and (n) induction heating, may also be used to activate thermoset and thermoplastic (hot-melt) adhesives, as well as thermoelastic (heat-sh ⁇ nk) tubing
  • Induction heating is sometimes referred to as electromagnetic bonding (EMB)
  • thermoplastic article In direct heating (also known as resistance heating), heat is applied to the thermoplastic article to be bonded by directly attaching heating elements to the article Current flowing through the elements heats them The current is supplied by a power source directly connected to the elements, but the heating is not always efficient
  • Induction heating has been widely used to seal and bond polymeric mate ⁇ als
  • a composite bonding material (CMB) is formed by dispersing magnetically reactive susceptors in a thermoplastic earner which is compatible (irascible) with the thermoplastic bodies to be welded
  • the H field induces heating in the magnetic mate ⁇ al Heating may be caused by one of two effects hysteresis loss, or resistive loss from induced eddy currents
  • the E field does not interact with the magnetic particles
  • Direct and induction heating techniques may be combined
  • End seals can be used with hot melts as an alternative bonding material Hot melt is placed between the resistance wires and the resistance wires are heated to form a bond between the cables and the end seal surfaces
  • Hot melt bonding can be used with different end seal mate ⁇ als such as foams, elastomers and thermoplastics, but the bond strength is weaker than the fusion bond seal
  • One of these seals comprises a core portion of a flexible, resilient, self-adhesive mate ⁇ al
  • the core portion has an outer pe ⁇ phery and openings extending therethrough The openings communicate with the outer pe ⁇ phery
  • An elongated, flexible tail portion is integral with and extends from the core pe ⁇ phery to be wrapped about the core portion and the cables placed in the openings
  • this mate ⁇ al may not be suitable for some applications
  • Another end seal configuration comp ⁇ ses a closure which consists of a closure body having two segmented end seals
  • Each of these segmented end seals includes a central support structure surrounded by segmented seal members
  • the end sections are sized and configured for mating with the support structure
  • Each of the end sections has a portion of its pe ⁇ phery which comp ⁇ ses a segment of the pe ⁇ phery of the assembled segmented end seal so that when the end sections and the
  • a cable end seal comp ⁇ ses a body having a plurality of cable ports formed therethrough Each port has an inner circumferential surface A first arcuate portion of the port surface is formed by a first portion of the body and a second arcuate portion of the port surface is formed by a second portion of the body The first and second body portions are movable between open and closed positions In the open position, the first and second body portions and the arcuate port surface portions are apart In the closed position, the first and second body portions and the arcuate port surface portions are joined to form an enclosure including the ports for engaging pe ⁇ pheral surfaces of the cables to be placed therein
  • a principal advantage of the present invention is that a one piece end seal can capture a plurality of cables extending through ports in the end seal
  • An elect ⁇ cal stimulus can be used to heat and bond abutting cable and seal member surfaces together into a sealed unit This can be enhanced by utilizing a continuous sealant st ⁇ p having conductors embedded therein to heat and seal the cables in the ports and to seal the engaged surfaces of the body portions when they are joined together
  • Fig 1 is a frontal view illustrating an embodiment of the closed end seal according to the present invention
  • Fig 2 is an isometric view illustrating the open end seal according to the embodiment of Fig 1 of the present invention
  • Fig 3 is a partial isometric view illustrating the open end seal according to the embodiment of Fig 1 of the present invention
  • Fig 4 is a further isometric view illustrating the open end seal according to the embodiment of Fig 1 of the present invention
  • Fig 5 is a frontal view illustrating another embodiment of the closed end seal according to the present invention.
  • Fig 6 is an isometric view illustrating the open end seal according to the embodiment of Fig. 5 of the present invention
  • Fig. 7 is an isometric view illustrating the open end seal according to the embodiment of Fig 5 of the present invention Description of the Preferred Embodiment
  • a cable end seal is generally designated 10 and comprises an enclosure body 12 formed of a polyolefin elastomer material having a plurality of cable ports 14 formed therethrough A first body portion 16, and a second body portion 18 are interconnected and move between an open position as illustrated in Fig 2 and a closed position as illustrated in Fig 1
  • Each port 14 is cylindrical and includes a segmented inner circumferential surface 20 having a first arcuate portion 20a formed by first body portion 16 and a second arcuate portion 20b formed by second body portion 18
  • body 12 has an outer peripheral surface 22 which is circular
  • first body portion 16 includes a hub 17 and three integral radially outwardly extending arms 16a, ⁇ 6b,
  • Second body portion 18 includes three adjacent segments of a circle 30 ,
  • a pivotal interconnection 38 between each segment 30a, 30b, 30c and a similar connection 40 between segment 30c and first body portion 16 are each formed by a flexible portion of the matenal forming body 12
  • Each port 14 includes a plurality of concent ⁇ c segmented rings 46 interconnected in a bellows type of construction, Fig 3
  • the rings 46 are selectively removable for adjusting the size of port 14 to engage surface 43 of cable 45
  • Each ⁇ ng 46 has a different diameter than each other ring 46
  • each port 14 is of an adjustable size
  • one or more of the ports 14 can include a plug 48 formed as the innermost concent ⁇ c ring so that for example, where body 12, Fig 2, is provided with three ports 14 and only two cables are being sealed by end seal 10, one of the ports 14 can remain blocked by plug 48 and thus sealed
  • an end seal 110 includes a body 112 has an outer pe ⁇ pheral surface 122 which is oblong
  • a first body portion 116 is pivotally interconnected to a second body portion 1 18 by a flexible portion 138 of the mate ⁇ al forming body 112
  • First body portion 116 includes a continuous surface 126 which comprises a plurality of planar walls 134 alternately formed with a plurality of first arcuate surface portions 120 ⁇
  • Second body portion 118 includes a continuous surface 128 which comp ⁇ ses a plurality of planar walls 136 alternatively formed with a plurality of second arcuate surface portions 1206
  • First and second arcuate portions 120 ⁇ , 1206 form a plurality of cylindrical ports 114 and comprise a segmented inner circumferential surface 120
  • Each port 114, Fig 6, includes a plurality of concent ⁇ c segmented rings 146 interconnected in a bellows type of construction The rings 146 are selectively removable for adjusting the size of port 114 Each ring 146 has a different diameter than each other ⁇ ng 146 Thus, each port 114 is of an adjustable size Also, one or more of the ports 114 can include a plug 148 formed as the inner most concent ⁇ c ⁇ ng so that, for example, where body 112 is provided with three ports 114 and only two cables are being sealed by end seal 110, one of the ports 1 14 can remain blocked by plug 148 and thus sealed Tabs 142, 144, Fig 5, only one of which is shown, engage portions 116, 118 respectively, when body 112 is in the closed position
  • a suitable bond may be in some instances accomplished by resistance heating of abutting surfaces by the placement of nichrome wire at or -near the abutting surfaces. Electrical stimulation of the wire will heat surrounding material sufficiently to bond all heated abutting surfaces, and with pressure applied through the curing process, suitable welds can be produced.
  • the nichrome wire can be in the typical round wire form or a flat strip and can be coated, imbedded or laminated in a strip of suitable sealant material such as polyethylene. Electrical stimulation of the wire will heat the surrounding sealant material and the abutting surfaces to be sealed. All abutting surfaces can be sealed in this manner enhanced by the additional or surplus sealant material which will assist in providing suitable seals with pressure applied through the curing process.
  • a susceptor containing material can be added to the sealant which absorbs RF energy and transfers it into heat energy.
  • the wire is preferably copper and functions as an antenna.
  • the heat produced causes the susceptor containing material including a polyethylene binder and the abutting surfaces to be sealed.
  • sealing is enhanced by the additional or surplus material which will assist in providing suitable seals with pressure applied through the curing process.
  • a fusion bonded seal is provided between planar sides 26, 28 of each arm 16a, 16b, 16c, and abutting planar walls 34, 36, respectively, of each of the segments 30a, 30b and 30c.
  • the fusion bonded seal is also provided along annular surface 20 of each port 14.
  • the seal is accomplished by providing a resistance wire 52 imbedded in a sealant strip 54 applied to the above-mentioned surfaces.
  • the resistance wire 52 forms a closed circuit in which alternating current (AC) or direct current (DC) is applied for power.
  • sealant strip 54 can also be provided to outer peripheral surface 22 of end seal body 12.
  • seal body 12 when seal body 12 is mounted in an end of a splice closure housing 56, illustrated in phantom outline in Fig 1, which is in abutment with outer surface 22 of the seal body 12, the body 12 can be bonded to housing 56 Also, cable surface 43 is bonded to surface 20 of port 14, Fig 4
  • the resistance wire 52 can be of rounded cross-section but is preferably in the form of a flat ribbon molded or laminated into sealant strip 54 of polyethylene material.
  • the strip 54 may be placed along the appropriate surfaces as aforesaid
  • a fusion bonded seal as described above is provided between abutting planar walls 134, 136, Fig. 7, of body portions 116, 118, respectively
  • the fusion bonded seal is also provided between annular surface 120 of each port 114 and cable surface 143
  • the seal is accomplished by wire 52 in sealant strip 54 as aforesaid
  • wire 52 and strip 54 can also be provided to outer peripheral surface 122 of end seal body 112 In this manner, when seal body 112 is mounted in an end of a splice closure housing 156, illustrated in phantom outline in Fig 5, which is in abutment with outer surface 122 of seal body 112, the body 112 can be bonded to housing 156
  • the principal advantage of the present invention is that it provides a one-piece device when joined around cables extending through the ports which forms seals between the cable peripheral surfaces and the ports and also forms seals between the movable body portions of the end seal when those portions are joined together
  • the fusion bonded end seal has advantages over previous approaches to end seal integrity
  • the end seal is flexible to accommodate a multiple range of cable diameters and includes adjustable size ports Fusion bond strength between cables and end seal is higher than with a conventional hot melt system
  • the end seal is a one piece design comprising a plurality of interconnected segments and no trimming is required for multiple cable diameters
  • the end seal material can be re-entered and removed from the cables by cutting the material
  • the end seal of the present invention does not require the use of a torch for heating.
  • Utility of the invention allows the end seal to be a main sealing member for cable closure bodies in that it seals to the cable surfaces and also is sealed to the adjoining cable closure body This forms an air tight, pressure and moisture seal to external elements
  • Basic features of the end seal provide built in strain relief, acceptance of different cable diameters, and total seal integrity between the relatively movable end seal body portions, the cables extending therethrough, and the closure body it is mounted in Furthermore, the use of a continuous sealant strip to seal the cables in the ports and to seal the engaged surfaces of the body portions when they are engaged together, provides for facilitated installation

Landscapes

  • Cable Accessories (AREA)

Abstract

Joint d'obturateur (10) de câble composé d'un corps en une pièce (12) comportant des ouvertures cylindriques (14) pour câbles. L'élément (12) se compose d'une première et d'une deuxième parties interconnectées (16, 18). Chaque ouverture présente une surface intérieure périphérique formée en partie par la première partie (16) et en partie par la seconde partie (18) du corps. Les parties (16, 18) du corps peuvent être actionnées entre une position ouverte et une position fermée. En position ouverte, les parties formant la surface périphérique intérieure sont séparées. En position fermée, les parties formant la surface périphérique intérieure sont jointes et les première et deuxième parties du corps se touchent. Un câble (45) peut traverser chaque ouverture (14). Une première bande adhésive (54) peut être placée le long de la jonction entre les première et seconde parties (16, 18) du corps et le long de la surface périphérique intérieure de chaque ouverture (14) entourant un câble (45). Une stimulation électrique ou électromagnétique peut être produite pour chauffer la bande (54) et assembler chaque câble (45) ainsi que les parties (16, 18) du corps de façon à former un ensemble étanche.
PCT/US1997/004047 1996-11-12 1997-03-12 Joint d'obturateur de cables pour obturation de type pince WO1998021799A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23261/97A AU2326197A (en) 1996-11-12 1997-03-12 Clamp type cable closure end seal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74770796A 1996-11-12 1996-11-12
US08/747,707 1996-11-12

Publications (1)

Publication Number Publication Date
WO1998021799A1 true WO1998021799A1 (fr) 1998-05-22

Family

ID=25006287

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/004047 WO1998021799A1 (fr) 1996-11-12 1997-03-12 Joint d'obturateur de cables pour obturation de type pince

Country Status (2)

Country Link
AU (1) AU2326197A (fr)
WO (1) WO1998021799A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000046895A1 (fr) * 1999-02-05 2000-08-10 3M Innovative Properties Company Joint terminal segmente d'une gaine telle qu'une gaine d'epissure
CN1311600C (zh) * 1999-12-02 2007-04-18 Ccs技术公司 用于纵向分体电缆配件的密封体
ES2656775A1 (es) * 2016-08-26 2018-02-28 Ticplas R & D S.L. Tapón de anclaje y sellado articulado, flexible y extensible
EP4130829A1 (fr) * 2021-08-04 2023-02-08 Prysmian S.p.A. Enceinte de télécommunications
CN117791438A (zh) * 2023-12-28 2024-03-29 扬州硕宇高压电气有限公司 一种电缆终端头的尾管密封设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622436A (en) * 1985-05-21 1986-11-11 L & F Company Plug assembly and method for encapsulating a cable within a conduit
EP0232180A2 (fr) * 1986-02-06 1987-08-12 RAYCHEM CORPORATION (a Delaware corporation) Dispositif d'étanchéité segmenté placé à l'extrémité et fermeture
EP0320236A2 (fr) * 1987-12-11 1989-06-14 Minnesota Mining And Manufacturing Company Capuchon d'extrémité d'un dispositif de fermeture d'un câble
WO1990005401A1 (fr) * 1988-11-09 1990-05-17 N.V. Raychem S.A. Ensemble de boitier
US5059748A (en) * 1990-04-26 1991-10-22 Raychem Corporation Cable splice enclosure
WO1993010960A1 (fr) * 1991-11-27 1993-06-10 Minnesota Mining And Manufacturing Company Procede et article pour la liaison par micro-ondes de fermetures d'epissures
DE4222101A1 (de) * 1992-07-07 1994-01-13 Cellpack Ag Wohlen Kabel-Endabdichtvorrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622436A (en) * 1985-05-21 1986-11-11 L & F Company Plug assembly and method for encapsulating a cable within a conduit
EP0232180A2 (fr) * 1986-02-06 1987-08-12 RAYCHEM CORPORATION (a Delaware corporation) Dispositif d'étanchéité segmenté placé à l'extrémité et fermeture
EP0320236A2 (fr) * 1987-12-11 1989-06-14 Minnesota Mining And Manufacturing Company Capuchon d'extrémité d'un dispositif de fermeture d'un câble
WO1990005401A1 (fr) * 1988-11-09 1990-05-17 N.V. Raychem S.A. Ensemble de boitier
US5059748A (en) * 1990-04-26 1991-10-22 Raychem Corporation Cable splice enclosure
WO1993010960A1 (fr) * 1991-11-27 1993-06-10 Minnesota Mining And Manufacturing Company Procede et article pour la liaison par micro-ondes de fermetures d'epissures
DE4222101A1 (de) * 1992-07-07 1994-01-13 Cellpack Ag Wohlen Kabel-Endabdichtvorrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000046895A1 (fr) * 1999-02-05 2000-08-10 3M Innovative Properties Company Joint terminal segmente d'une gaine telle qu'une gaine d'epissure
US6248953B1 (en) 1999-02-05 2001-06-19 3M Innovative Properties Company Segmented end seal for a closure such as a splice case
CN1311600C (zh) * 1999-12-02 2007-04-18 Ccs技术公司 用于纵向分体电缆配件的密封体
ES2656775A1 (es) * 2016-08-26 2018-02-28 Ticplas R & D S.L. Tapón de anclaje y sellado articulado, flexible y extensible
EP4130829A1 (fr) * 2021-08-04 2023-02-08 Prysmian S.p.A. Enceinte de télécommunications
CN117791438A (zh) * 2023-12-28 2024-03-29 扬州硕宇高压电气有限公司 一种电缆终端头的尾管密封设备

Also Published As

Publication number Publication date
AU2326197A (en) 1998-06-03

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