EP0482973A2 - Gehäuseloger Leitungsverbinder für Datenübermittlung und Koppelungsmethode - Google Patents

Gehäuseloger Leitungsverbinder für Datenübermittlung und Koppelungsmethode Download PDF

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Publication number
EP0482973A2
EP0482973A2 EP91402581A EP91402581A EP0482973A2 EP 0482973 A2 EP0482973 A2 EP 0482973A2 EP 91402581 A EP91402581 A EP 91402581A EP 91402581 A EP91402581 A EP 91402581A EP 0482973 A2 EP0482973 A2 EP 0482973A2
Authority
EP
European Patent Office
Prior art keywords
arrangement
cables
wires
coupling
encapsulant
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.)
Withdrawn
Application number
EP91402581A
Other languages
English (en)
French (fr)
Other versions
EP0482973A3 (de
Inventor
David Otis Gallusser
James Brownlow Lebaron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amphenol Corp
Original Assignee
Amphenol Corp
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 Amphenol Corp filed Critical Amphenol Corp
Publication of EP0482973A2 publication Critical patent/EP0482973A2/de
Publication of EP0482973A3 publication Critical patent/EP0482973A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections
    • H01R4/72—Insulation of connections using a heat shrinking insulating sleeve

Definitions

  • This invention relates to the field of electrical cable coupling and shielding, and in particular to a data bus coupling arrangement of the type including a transformer and isolation resistors for electrically coupling together three or more data buses.
  • Data bus coupling arrangements are known which permit coupling of multiple high frequency data buses via transformers and isolation elements such as resistors.
  • An example of such a coupler is disclosed in European patent application EP-A-O 448 230 in the name of thy Applicant.
  • This application describes a data bus coupler which includes a rigid housing for enclosing the coupling components.
  • the coupler housing is overbraided to provide a continuous uninterrupted shield over the entire coupler, while nevertheless reducing its size in comparison with couplers having a rigid or solid shield.
  • the data bus cables are themselves each shielded by a metallic outer braid, providing excellent protection from interference.
  • the problem to be overcome is that, at the point where the individual conductors are attached to the conventional coupler, shielding discontinuities may be present. The smaller the coupler, the more difficult it is to control such discontinuities.
  • overbraided data bus coupler size is reduced by providing a flexible braid over the rigid data bus coupler housing.
  • the housing is retained to protect the delicate coupling components from physical damage. While clearly an improvement over prior art arrangements, further size reductions in the size of the overbraided coupler were limited by the need to provide a housing for the coupling.
  • a rigid coupler housing is not necessary, and coupler size can be reduced without sacrificing protection of the coupler components from physical shocks, environmental degradation, or electromagnetic interference.
  • a data bus coupling arrangement in which individual wires of a data bus are directly wired to a transformer and corresponding isolation resistors, without an intervening terminal arrangement.
  • Support for the coupling is provided by a heat shrinkable, or otherwise mechanically shrinkable, flexible tubing which is filled with an encapsulant to provide structural support, vibration and shock dampening, and electrical isolation of all components.
  • overbraiding and an environmental seal are subsequently also included, according to the preferred embodiment, for the purpose of preventing EMI leakage and providing protection from such environmental contaminants as dust and moisture.
  • Figure 1 is a cross-sectional side view of an uncased data bus coupling arrangement according to a preferred embodiment of the invention.
  • Figure 2 is a circuit diagram of the coupling arrangement of Figure 1.
  • Figure 3 is a cross-sectional side view of the coupling arrangement of Figure 1, with the addition of an overbraided shield.
  • Figure 4 is a cross-sectional side view of the overbraided coupling arrangement of Figure 3, with the addition of an environmental seal.
  • FIG. 1 is a cross-sectional side view of an uncased data bus coupler 4 constructed in accordance with the principles of a preferred embodiment of the invention for electrically coupling three shielded data bus cables 1, 2, and 3.
  • Each of the shielded cables includes a respective jacket 5-7, enclosing respective braided shields 8-10.
  • Each cable carries two insulated stranded or solid wires (17 and 18, 19 and 20, and 21 and 22, respectively) each of which is surrounded by individual wire insulators 11 - 16.
  • the respective wires of cables 1, 2, and 3 are coupled through a toroidal transformer 23 and resistors 28 and 29 as follows: wires 17 and 18 from cable 1 are individually joined to ends 24 and 27 on individual windings of the transformer. The other ends 25 and 26 of the two windings of the transformer are joined to leads 30 and 32 of isolation resistors 28 and 29. Leads 31 and 33 of the two resistors are respectively coupled to wires 21 and 22 of cable 3 and 19 and 20 of cable 2, resulting in the circuit arrangement shown in Figure 2.
  • the values of the two resistors and the number of coils on the transformer are of course dependent upon the specific type of cables or data buses used.
  • other circuit elements may be added in place of or in addition to the transformer and resistors to effect an electrical coupling, and the type of transformer may be vied as required.
  • the respective wires of cables 1, 2 and 3 may be attached to the leads of the transformer and resistors by any known method of electrical connection, although the well-known technique of wrapping followed by soldering is currently preferred.
  • the braids 8-10 are removed from the ends of the wires, and jackets 5-6 are removed a predetermined distance from the ends of the braid.
  • each of the wires including a portion of jackets 11- 16, and the electrical components 23, 28, and 29, are all encapsulated by a suitable electrically insulating material 34 such as silicon RTV which is supplied in liquid form and solidifies upon curing.
  • RTV encapsulant 34 provides structural support, vibration and shock damping, and electrical isolation of all components. It will be appreciated, however, that other encapsulants having similar properties may be substituted for the RTV. Also, it is noted that for best shock protection, the cured encapsulant should retain a degree of flexibility.
  • a shrinkable or "dimensionally recoverable" tubing 35 Surrounding the RTV is a shrinkable or "dimensionally recoverable" tubing 35 which encases the RTV prior to curing and provides electrical isolation.
  • the tubing 35 is made of a heat shrinkable material.
  • suitable heat shrinkable materials are known to those skilled in the art, for example crystalline polymers such as polyolefins, including polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer or other ethylene copolymers, polyvinylide difluoride, polyvinyl chloride, etc., whether cross-linked or inherently heat-recoverable.
  • Other examples include thermoplastic elastomers such as thermoplastic polyurethanes and silicone-styrene block copolymers.
  • Tubing 35 shrinks and becomes rigid upon application of heat, providing support for the encapsulant as it cures, while at the same time providing an inwardly directed pressure against the encapsulant which causes the encapsulant to completely fill all voids between the components. Because the encapsulant must remain fluid during shrinkage of the tubing, it is important for the respective shrinking and curing temperatures to be selected accordingly.
  • each of the individual shields 8-10 of cables 1-3 are electrically connected together by an overbraided shield 36, best shown in Figure 2, which completely encloses the uncased coupling.
  • overbraid 36 may be formed in two or more parts and joined by one or more seams.
  • the overbraid is woven from electrically conductive wires in the same known manner as the individual braids of the cables, and may include narrower sections 37 and 38 to fit closely around the individual cables.
  • the overbraid 36 may be electrically connected to the three respective cable shields by any of a variety of suitable electrical connection or bonding methods, including soldering or weaving the ends of the overbraid into the braided shields of the cable. Numerous other electrical connection methods will also occur to those stilled in the art.
  • overbraid instead of a rigid metal shield, assembly is greatly simplified due to ease of manipulating the braiding and the greater dimensional tolerances involved.
  • the overbraid may be replaced by substituting various other flexible or easily manipulated conductive materials such as, but not limited to, pressed-over metal, metal foil wrap, and vapor deposited conductive materials.
  • an environmental seal 40 encloses the overbraid 36 and the stripped back portions of the cable shields, ending at cable jackets 5-7.
  • Bond seals are preferably added between the outer seal 40 and jackets 5-7 in order to further protect the EMI shielded assembly from moisture, dust, and other environmental contaminants.
  • Outer seal 40 may be applied by any of a variety of known methods, including plasticoat dipping, conformal coating, overmolding, wrapping, seam welding, and so forth.
  • the uncased data bus coupler is preferably assembled according to the following method steps:
  • the individual cables are stripped to expose the pairs of wires therein and the braided shield.
  • the individual insulators of the respective wires are also stripped and the exposed bare wires or strands of wires are directly connected to the transformer and respective resistors by any suitable method such as soldering, after which a shrinkable tubing material such as heat shrink tubing is positioned over the coupling.
  • the heat shrink tubing is selected to shrink to a suitable shape upon application of heat.
  • RTV or a similar encapsulant is injected into the tubing, after which the heat is applied.
  • the tubing then shrinks to an appropriate shape causing the encapsulant to fill all of the voids within the tubing.
  • the encapsulant becomes solid to provide a solid structural support for the various components.
  • the coupling may be overbraided by adding an overbraid as described above, followed by addition of the environmental seal to complete the coupling arrangement.

Landscapes

  • Cable Accessories (AREA)
  • Insulated Conductors (AREA)
EP19910402581 1990-09-27 1991-09-26 Gehäuseloger Leitungsverbinder für Datenübermittlung und Koppelungsmethode Withdrawn EP0482973A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58872890A 1990-09-27 1990-09-27
US588728 1990-09-27

Publications (2)

Publication Number Publication Date
EP0482973A2 true EP0482973A2 (de) 1992-04-29
EP0482973A3 EP0482973A3 (de) 1992-05-13

Family

ID=24355045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910402581 Withdrawn EP0482973A3 (de) 1990-09-27 1991-09-26 Gehäuseloger Leitungsverbinder für Datenübermittlung und Koppelungsmethode

Country Status (3)

Country Link
EP (1) EP0482973A3 (de)
JP (1) JPH04262307A (de)
CA (1) CA2052206A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0793308A1 (de) * 1996-03-01 1997-09-03 W.L. GORE & ASSOCIATES GmbH Leitungskoppler

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1278171A (en) * 1969-09-18 1972-06-14 S I R T I Soc It Reti Telefoni A process for the joining of coaxial cables having intermediate insulation of low melting point material, in particular of coaxial "micro" cables having intermediate insulation of expanded plastics material, and the joiny thus obtained
US3889047A (en) * 1974-02-15 1975-06-10 Lockheed Aircraft Corp Sealing and moisture-proofing of electrical joints
US4450871A (en) * 1981-04-21 1984-05-29 Sumitomo Electric Industries, Ltd. Heat-shrinkable tubes
US4450318A (en) * 1981-09-29 1984-05-22 Siemens-Allis, Inc. Means and method for providing insulation splice
BR8404698A (pt) * 1983-09-20 1985-08-13 Raychem Corp Processo de formar uma junta de derivacao,processo de encerrar terminais de cabos eletricos e junta de derivacao
AU590056B2 (en) * 1986-03-04 1989-10-26 Ericsson Australia Pty Ltd Improvements in or relating to encapsulated electrical apparatus
US5115105A (en) * 1990-02-21 1992-05-19 Amphenol Corporation Overbraided in-line data bus loom

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0793308A1 (de) * 1996-03-01 1997-09-03 W.L. GORE & ASSOCIATES GmbH Leitungskoppler
US5949300A (en) * 1996-03-01 1999-09-07 Olsson; Stellan Line coupler

Also Published As

Publication number Publication date
CA2052206A1 (en) 1992-03-28
EP0482973A3 (de) 1992-05-13
JPH04262307A (ja) 1992-09-17

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