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Electrical connector

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Publication number
US3825874A
US3825874A US37688473A US3825874A US 3825874 A US3825874 A US 3825874A US 37688473 A US37688473 A US 37688473A US 3825874 A US3825874 A US 3825874A
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Grant
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Prior art keywords
contact
connector
foil
contacts
electrical
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Expired - Lifetime
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W Peverill
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ITT Corp
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ITT Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R24/00Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H01R24/56Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency specially adapted to a specific shape of cables, e.g. corrugated cables, twisted pair cables, cables with two screens or hollow cables
    • H01R24/568Twisted pair cables
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00-H01R33/00
    • H01R13/648Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
    • H01R13/658High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591Specific features or arrangements of connection of shield to conductive members
    • H01R13/6592Specific features or arrangements of connection of shield to conductive members the conductive member being a shielded cable
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00-H01R33/00
    • H01R13/648Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
    • H01R13/658High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591Specific features or arrangements of connection of shield to conductive members
    • H01R13/6597Specific features or arrangements of connection of shield to conductive members the conductive member being a contact of the connector

Abstract

An electrical connector with an internal grounding foil for grounding outer conductors of multi-conductor cables. The invention is particularly suited for Twinax cables in which the shields are grounded to the connector shell by the grounding foil to preclude or minimize the transmission of electromagnetic pulses (EMP) through the connector. The connector also houses pin contacts which may be either insulated from the grounding foil or carry filter elements which attenuate radio frequency interference (RFI).

Description

United States Patent [1 1 [111 3,825,874 Peverill 1 July 23, 1974' [54] ELECTRICAL CONNECTOR 3,629,785 12/1971 Cowmeadowl 339/14 R 3,646,495 2/1972 Cowmeadow l 339/14 R [75] Inventorm' Peveml San Clemente 3,648,222 3/1972 Cowmeadow... 339/14 R Callf- 3,744,001 7/1973 Schor 339/14 R [73] Assignee: International Telephone and I Telegraph Corporation, New York, Primary y y N Y Assistant Examiner-Robert A. l-lafer An A t, F -Th L. Pt Filed: J y 5,1973 orney gen 0r lrm omas e erson [21] Appl. No.: 376,884 [57] ABSTRACT An electrical connector with an internal grounding foil 52] .s L 339 14 R 339 143 R, 339 147 R for grounding outer conductors of multi-conductor ca- 51 Int.C1 H01r 3/06 bles- The invention Particularly suited for Twinax 5 Field f Search '339 4 R, 4 L, 7 R cables in which the shields are grounded to the con- 339 17 M 177 R, 143 R, 43 C, 43 S, 147 nector shell by the grounding foil to preclude or mini- R, 147 M mize the transmission of electromagnetic pulses (EMP) through the connector. The connector also [5 References Cited houses pin contacts which may be either insulated UNITED STATES PATENTS from the grounding foil or carry filter elements which 3 335 388 .8/l967 Karol 7 339/18 attenuate radio frequency interference (RFI).

3/1971 Sorensen 339/143 R 5 Claims, 2 Drawing Figures ELECTRICAL CONNECTOR BACKGROUND OF THE INVENTION The present invention relates generally to an electrical connector and, more particularly, to a connector which precludes or minimizes the transmission of electromagnetic pulses (EMP).

, For certain applications, such as in aircraft, it is important to provide protection against electromagnetic pulses which induce high electrical currents in electrical systems. Typically, such systems employ what is known in the art as Twinax cables for the transmission of electrical signals. In such a cable, twisted insulated wires are covered by a metallic sheath or braid which, in turn, is enclosed by an insulation sleeve. Such cables are utilized inasmuch as they provide better resistance to electromagnetic pulses (EMP) than do coaxial cables, yet also provide good RFI (radio frequency interference) protection. Such cables are carried from one compartment of an aircraft to another through electrical connectors. Typically these connectors have been separate and apart from conventional multi-pin contact connectors utilized in the electrical system. In addition, no convenient means are provided for grounding the outer conductor or metallic sheath of these cables when they are terminated to a multi-pin connector. Such grounding has been accomplished by the use of sheet metal straps or braces which are soldered, swaged, or welded to the outer conductor of the cable. Also, no multi-contact' Twinax connectors are now available, thus requiring a plurality of separate electrical connector members for interconnecting a plurality of cables as well as separate grounding straps for each such cable.

What is desired, then, and constitutes the principal object of the present invention is anelectrical connector which allows the interconnection of pluralities of Twinax cables and the grounding of the outer conductors of these cables without the necessity of soldering, swaging or welding. It is also desirable that the connector employ single pin contacts for single conductors as well as multi-pin contacts for Twinax and coaxial cables so thata single connector may provide complete electrical connection between various signal carrying conductors in the compartments of an aircraft or other facility. It is also an object of the invention to provide a connector which allows the contacts therein to be easily installed and removed so that alterations may be readily made in the connection assembly at the site of use.

SUMMARY OF THEINVENTION It is the principal aspect of the present invention to provide an improved electrical connector which allows the interconnection of multi-conductor cables as well as single conductors. The connector employs a grounding foil which frictionally engages the inner surface of the shell of the connector. The foil is formed with a plurality of apertures through which the contacts extend. Some of the contacts are pin contacts for transmission of signals 'by single conductors. In other of the apertures, the contacts include an inner conductor and outer conductor surrounding and spaced from the inner conductor. A cable, which may be either a Twinax cable or a coaxial cable, is connected to each of such contacts. The outer metallic sheath of the cable is joined to the outer conductor of the contact which in turn frictionally engages the grounding foil so as to provide a grounding connection between the sheath and the shell of the connector. Since the contacts are releasably mounted in the grounding foil, any variety of contacts and arrangement thereof may be provided in the connector at the location of use, thus facilitating maintenance, repair, and substantial variation in the electrical interconnection of the electrical system in which the connector is employed.

BRIEF DESCRIPTION OF THE DRAWING removed.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing in detail, the connector of the present invention, generally designated 10, comprises a grounding plane or foil 12, sandwiched between a front insulator l4 and rear insulator 16 mounted in a metal shell 18. The shell is formed with amounting flange 20 which may be secured to a rigid structure by 4 means of a bolt (not shown) passing through the hole 22 in the flange. The grounding foil is a metal sheet generally circular in shape and having a diameter slightly less than the inner diameter of the shell 18 at the point where the foil is to be mounted. The foil is formed with a plurality of peripheral fingers 24 which frictionally engage the inner surface of the shell 18. A plurality of individual apertures 26 are formed in the foil. As can been seen from the drawing, all the apertures 26 have the same diameter. Each of the apertures contains a plurality of short tangs 28 which are bent at an angle to form a funnel. The tangs deflect radially outwardly when an electrical contact element is mounted in one of the apertures and frictionally engage the outer surface of the contact. Reference is made to U.S. Pat. No. 3,569,915 which provides a detailed disclosure of a grounding foil of a type utilized in the present invention. Such disclosure is incorporated herein by reference.

The insulators 14 and 16 are formed with a plurality I of a first set of coaxial passages 30 and 32, respectively,

which are aligned with selected ones of apertures 26 in the grounding foil. Recesses 34 are formed in the rear face 36 of the front insulator 14 for receiving the tangs 28 on the grounding foil. A plurality of a second set of aligned passages 38 and 40 are formed in the front and rear insulators, respectively, aligned with certain other apertures in the grounding foil. The passages 38 and 40 are smaller in diameter than the passages 30 and 32. Conventional pin contacts 42 are mounted in the passages 38 and 40 in the front and rear insulators, respectively, only one being illustrated in FIG. 1. The contact 42 may be surrounded by an insulation sleeve 44, as shown, positioned in cavities 45 in the insulators or an RFI filter. The outer surface of the filter is in frictional contact with the tangs of the grounding foil so that the filter will be grounded to the shell 18 of the connector.

The contacts mounted in the coaxial passages 30 and 32 in the insulators may be Twinax contacts, coaxial contacts, or both, as shown. The contact 46 illustrated in FIG. 1 is connected to a Twinax cable 48. This cable includes a pair of twisted insulated wires 50 which are surrounded by a metal braid or sheath 52. This sheath is covered by an insulation sleeve 54.

The contact 46 comprises an outer cylindrical metal sleeve 56 which is terminated to the cable braid 52 by standard methods such as mechanical clamping with a ferrule or a clamp nut, or by mechanical crimping. The twisted wires 50 of the Twinax cable are connected to respective pin contacts 58 which are mounted in an insulator 60 mounted in the metal sleeve 56. The contact 46 is held in the insulators 14 and 16 by a metallic contact retaining clip 62 captivated in the rear insulator 16. The clip is formed with a pair of forwardly and inwardly extending fingers 64 which engage behind a collar 66 formed on the outer sleeve 56 of the contact 46. Reference is made to US. Pat. No. 3,158,424 for a detailed disclosure of such a retaining clip and means for releasing the clip to allow the contact to be withdrawn rearwardly from the insulators. Such disclosure is incorporated herein by reference.

The coaxial contact, generally designated 68, illustrated in FIG. 1 differs from the contact 46 only in that it employs a single pin contact 58 mounted coaxially within the outer metal sleeve 56'. The contact 68 is connected to a coaxial cable 70 having an inner conductor 72 surrounded by an insulation sleeve 74. This sleeve is surrounded by a metallic braid 76 which is covered by an insulation sleeve 78. The braid 76 is joined to the outer sleeve 56' of the contact 68 in a conventional manner while the inner conductor 72 is connected to the pin contact 58' such as by crimping. The contact 68 is retained in the insulators in the same manner as is contact 46.

Any number of Twinax contacts 46, coaxial contacts 68, and pin contacts 42 may be mounted in the connector of the present invention. Also, the contacts 46 and 68 may be all Twinax contacts or coaxial contacts, depending upon the particular electrical system in which the connector is employed. To preclude or minimize the transmission of electromagnetic pulses through the connector, preferably the contacts 46 and 68 are all Twinax contacts and to minimize radio frequency interference, the pin contacts 42 should be surrounded by filters. By such an arrangement complete EMl/RFl/EMP protection is provided within a single connector. The connector may be easily disassembled for replacement of the contacts for the purpose of varying the types of contacts utilized in the connector at the place of use.

What is claimed is:

1. An electrical connector comprising:

an electrical connector shell;

a grounding foil in said shell frictionally engaging the inner surface of said shell;

a plurality of apertures in said foil having substantially the same diameter, each said aperture being bordered by a plurality of inwardly extending tangs integral with said foil;

first and second electrical contacts;

5 said first contact comprising a pin contact having a diameter substantially less than that of said second contact and said apertures, said pin contact passing through one of said apertures without engaging the tangs associated with said one aperture;

a cylindrical member surrounding said pin contact and passing through said one aperture, the outer surface of said member frictionally engaging said tangs associated with said one aperture;

said second contact including an inner conductor and an outer conductor surrounding and spaced from said inner conductor, said second contact extending through another of said apertures with said outer conductor frictionally engaging the tangs associated with said other aperture; and

a cable connected to said second contact, said cable having a pair of conductors coupled, respectively, to the inner and outer conductors of said second contact.

2. An electrical connector as set forth in claim 1 wherein:

one of the conductors of said cable connected to said second contact comprises a pair of twisted insulated wires; and

said second contact has a pair of said inner conductors each connected to a respective one of said wires.

3. An electrical connector as set forth in claim 1 including:

a pair of insulators each positioned on opposite sides of said foil;

said insulators having pairs of coaxial passages therein aligned with each of said apertures, the portions of said pairs of passages adjacent to said foil having substantially the same diameter;

said second contact being positioned in one of said pairs of passages; and

means in one of said passages of said one pair for releasably retaining said second contact in said one pair of passages.

4. An electrical connector as set forth in claim 1 wherein:

said shell is cylindrical; and

said grounding foil is formed with a plurality of peripheral fingers frictionally engaging the inner cylindrical surface of said shell.

5. An electrical connector as set forth in claim 1 wherein:

there are provided a plurality of said first and second contacts each positioned in one of said foil apertures.

Claims (5)

1. An electrical connector comprising: an electrical connector shell; a grounding foil in said shell frictionally engaging the inner surface of said shell; a plurality of apertures in said foil having substantially the same diameter, each said aperture being bordered by a plurality of inwardly extending tangs integral with said foil; first and second electrical contacts; said first contact comprising a pin contact having a diameter substantially less than that of said second contact and said apertures, said pin contact passing through one of said apertures without engaging the tangs associated with said one aperture; a cylindrical member surrounding said pin contact and passing through said one aperture, the outer surface of said member frictionally engaging said tangs associated with said one aperture; said second contact including an inner conductor and an outer conductor surrounding and spaced from said inner conductor, said second contact extending through another of said apertures with said outer conductor frictionally engaging the tangs associated with said other aperture; and a cable connected to said second contact, said cable having a pair of conductors coupled, respectively, to the inner and outer conductors of said second contact.
2. An electrical connector as set forth in claim 1 wherein: one of the conductors of said cable connected to said second contact comprises a pair of twisted Insulated wires; and said second contact has a pair of said inner conductors each connected to a respective one of said wires.
3. An electrical connector as set forth in claim 1 including: a pair of insulators each positioned on opposite sides of said foil; said insulators having pairs of coaxial passages therein aligned with each of said apertures, the portions of said pairs of passages adjacent to said foil having substantially the same diameter; said second contact being positioned in one of said pairs of passages; and means in one of said passages of said one pair for releasably retaining said second contact in said one pair of passages.
4. An electrical connector as set forth in claim 1 wherein: said shell is cylindrical; and said grounding foil is formed with a plurality of peripheral fingers frictionally engaging the inner cylindrical surface of said shell.
5. An electrical connector as set forth in claim 1 wherein: there are provided a plurality of said first and second contacts each positioned in one of said foil apertures.
US3825874A 1973-07-05 1973-07-05 Electrical connector Expired - Lifetime US3825874A (en)

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