U.S. patent number 3,825,874 [Application Number 05/376,884] was granted by the patent office on 1974-07-23 for electrical connector.
This patent grant is currently assigned to International Telephone and Telegraph Corporation. Invention is credited to William J. Peverill.
United States Patent |
3,825,874 |
Peverill |
July 23, 1974 |
ELECTRICAL 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).
Inventors: |
Peverill; William J. (San
Clemente, CA) |
Assignee: |
International Telephone and
Telegraph Corporation (New York, NY)
|
Family
ID: |
23486893 |
Appl.
No.: |
05/376,884 |
Filed: |
July 5, 1973 |
Current U.S.
Class: |
439/579;
439/607.07 |
Current CPC
Class: |
H01R
24/568 (20130101); H01R 13/6597 (20130101); H01R
13/6592 (20130101) |
Current International
Class: |
H01R
13/658 (20060101); H01r 003/06 () |
Field of
Search: |
;339/14R,14L,176R,176M,177R,143R,143C,143S,147R,147M |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gay; Bobby R.
Assistant Examiner: Hafer; Robert A.
Attorney, Agent or Firm: Peterson; Thomas L.
Claims
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;
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.
Description
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 an electrical 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 that a
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 THE INVENTION
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
FIG. 1 is a longitudinal, partial, sectional view through a
connector constructed in accordance with the present invention;
and
FIG. 2 is a perspective view, partially in section, of the
connector illustrated in FIG. 1, looking in the direction of the
rear of the connector, with the rear insulator 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 14 and rear
insulator 16 mounted in a metal shell 18. The shell is formed with
a mounting flange 20 which may be secured to a rigid structure by
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 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 U.S. 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 10 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
EMI/RFI/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.
* * * * *