Information
-
Patent Grant
-
6386914
-
Patent Number
6,386,914
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Date Filed
Monday, March 26, 200123 years ago
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Date Issued
Tuesday, May 14, 200222 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
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CPC
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US Classifications
Field of Search
US
- 439 579
- 439 578
- 439 580
- 439 584
- 439 585
- 439 607
- 439 92
- 439 95
- 439 96
- 439 98
- 439 108
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International Classifications
-
Abstract
An electrical connector has both grounded cables, such a coaxial or triaxial cables, and ungrounded cables or lines. A metallic outer connector body (200) has bores (270) for the grounded cables, which are held in place in the connector body with retainer clips (400). The retainer clips snap into place in spaces (244) inside the outer connector body and the contacts snap into the retainer clips. The center of the outer connector body accepts an inner connector body 100, which is dielectric.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to combined connectors, having mixed grounded and non-grounded contacts and to connectors with shielding.
2. Description of the Prior Art
Nakajima, in U.S. Pat. No. 4,974,075, discloses a connector with a coaxial arrangement of contact pins (62
b
) and mating sockets (81
a
) which engage the pins when the two parts of the connector are joined by relative motion in the axial direction. The pins are laid out in two concentric circles, one inside the other, to form two radial groups of contacts. The contacts are of the insulated type, with their conductors surrounded by plastic.
Nakajima provides shielding with a tubular or annular-cylindrical metal shield around the entire connector and another shield in between the inner and outer groups of contacts; the various parts fit together like telescope tubes, with alternating metal and plastic. Thus, electrical contacts belonging to the inner and outer circles are shielded from one another, but there is no shielding between contacts both belonging to one of the two radial groups of concentric contacts, which are separated only by plastic. There is nothing to prevent cross-talk within a radial group of contacts.
Another drawback of Nakajima's arrangement is mechanical weakness. The cylindrical annular plastic portions, in which the pins and sockets are embedded, have walls of minimum thickness because the interfitted metallic shields create extra bulk. The metal shielding pieces are relatively thin, too, for the same reason. If the assembled connector is subjected to a bending stress the interfitted annular cylindrical portions of the connector are liable to warp, making it difficult to separate and rejoin the two halves of the connector.
Each of Nakajima's mating connector halves uses expensive constructions, such as large-diameter threads and shoulder stops. Such large threads are not only expensive, but difficult to join.
The Nakajima arrangement is unsuited to connectors including ground contacts. For example, it would be difficult or impossible to adapt to a plurality of coaxial cable conductor pairs, or to shielded conductor pairs.
SUMMARY OF THE INVENTION
One object of the present invention is a connector that combines grounded lines in a single connector, for example, combining a coaxial cable with grounded outer conductor with a plurality of shielded conductor pairs.
Another object is a connector which is mechanically strong and tough.
Still another object is a connector which can simultaneously join triaxial, twinaxial, and/or coaxial cables and join their grounds at the same time.
The present invention provides a conductive, preferably solid metallic, insert or connector body for connecting a plurality of grounded cables, these being in addition to the usual non-grounded lines or cables typically found in the middle of a military-style (or other) connector. The insert comprises two mating annular cylinders each of which preferably fits into one half of a standard connector housing. Bores run longitudinally through the assembled connector body from end to end, and meet at the junction between the two cylinders. The cable couplings are held in each of the two cylinders with retention clips, so that the couplings mate when the two cylinders are mated.
Because the insert is conductive it provides an ideal common ground to which each of the grounded cable grounds can be coupled, and it also provides a Faraday shield around the coupling of each cable, to limit cross-talk. A common electrical connection exists among the two cylinders and the grounds of the cables. If the connector housings are metallic, a second electrical connection between each of the cylinders and its respective housing is preferably made as well. Staking is the preferred method of making this connection.
With these and other objects, advantages and features of the invention that may become hereinafter apparent, the nature of the invention may be more clearly understood by reference to the following detailed description of the invention, the appended claims and to the several drawings attached herein.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is an exploded perspective view of an electrical connector in accordance with the invention.
FIG. 2
is a cross-sectional view of the assembled connector of FIG.
1
.
FIG. 3
is an exploded perspective, detail, and partially cut-away view of coaxial contact cylindrical retainer clip.
FIG. 4
is a perspective view.
FIG. 5
is a combination side view and sectional view, with the sectional portion taken on a center line of the contact.
FIG. 6
is a detail view of FIG.
2
. It is similar to the sectional portion of
FIG. 5
except that the retainer clip is at a different angle about the contact longitudinal axis.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1
shows the electrical connector of the invention in overview, with two mating connectors being pictured. The parts above will be discussed first. A shell
900
is preferably conventional (the military style is shown in the drawing). The mating shell
901
is shown below. Such shells conventionally contain a single connector assembly each, with many pins or sockets in a dielectric to keep them insulated from one another. That is modified in the present invention.
Fitting inside the shell
900
are not one but two preferably nesting parts, an inner connector body
100
of dielectric and a outer connector body
200
. The outer connector body
200
has an axial aperture
210
for accepting the inner connector body
100
.
Preferably, the inner connector body
100
is standard, like the shell
900
, but is of a smaller size than the standard size that would fit the shell
900
. The outer connector body
200
is then dimensioned to accept the inner dielectric connector body
100
and to be accepted by the shell
900
.
The outer connector body
200
is conductive, preferably constructed of a metallic material such as plated aluminum. Alternatively, it may be made with non-a conductive material, such as plastic, impregnated with conductive particles or fibers to be conductive, or coated with a conductive material. The outer connector body
200
preferably functions as both a ground and as a Faraday shield, and any construction that is consistent with either of these two functions is within the scope of the present invention.
Positioned about the annulus of the outer insert or connector body
200
is a plurality of apertures
270
for accepting and retaining coaxial or triaxial contacts. Each of the plurality of apertures
270
is adapted to accept internally a grounding retainer clip
400
, which is shown in more detail in FIG.
3
. The retainer clip
400
holds within each aperture
270
a grounded (e.g., coaxial or triaxial) contact
700
, that is also shown in FIG.
3
. the outer surface of the contact
700
is a ground for that grounded cable.
FIG. 2
, a cross-sectional view on a plane lying on the axis of the assembled connector of
FIG. 1
, shows how the upper parts depicted in
FIG. 1
fit together into the shell
900
, and also shows the shape of portions of the outer connector body
200
that are hidden in FIG.
1
. Since the connector body
200
as a whole, and the bores of the apertures
270
, are figures of revolution in the illustrated embodiment, the outline in
FIG. 2
specifies the shape completely for the illustrated preferred embodiment.
The inner connector body
100
has contacts
110
fitted in the through-holes, preferably held in place by retainer clips
150
. The inner connector body
100
is conventional in the preferred embodiment and will not be discussed further.
An inner resilient elastomer moisture sealing grommet
130
is placed behind the inner connector body
100
, and an annular, outer resilient elastomer moisture sealing grommet
230
is placed behind the outer connector body
200
.
The parts that fit together into mating shell
901
, shown at the bottom of
FIG. 1
, hold the contacts (plain, coaxial, triaxial, etc.) that mate with the contacts of the upper shell
900
; that is male and female connector parts are reversed. The two shells are depicted facing the same direction; one would need to be reversed before they could be mated.
The parts of shell
901
that correspond to parts of shell
900
are indicated by primes. For example, outer connector body
200
′ is generally similar to outer connector body
200
, but much shorter, and it does not accept any of the contacts
700
that are shown in FIG.
3
and are discussed below. However, it will accept the retainer clips
400
. The connector bodies
200
and
200
′ form a pair of conductive, mating, annular cylinders each including a central space and an outer surface.
Additional parts that go into shell
901
, that lack corresponding parts in shell
900
, include two elastomer face seals
250
and
150
for sealing pin inserts or other contacts or parts, through which the contacts protrude in the alternate arrangement through raised tower portions.
It is noted that in the preferred embodiment the shells
900
and
901
is each capable of accepting the parts for the other shell.
FIG. 2
shows, located between the rear ends of the inner connector body
100
and the outer connector body
200
, a compressible ring
94
, which may be conventional. It is fitted between the inner connector body
100
and a shoulder in the bore of the outer connector body
200
, which takes the place of a shoulder in a shell of a standard size smaller than the shell
900
shown in the drawing, in interacting with the ring
94
. (The smaller shell is not shown.) The illustrated shell
900
includes a corresponding shoulder that, with a conventional connector insert, would press against the dielectric body.
In the present invention, the shoulder of the shell
900
instead bears against a staking ring
92
that is preferably compressible and of plated metal. It acts as an electrical bridge between the shell
900
and the outer connector body
200
to effectively ground the conductive outer connector body
200
, which in turn provides a ground for the grounded contacts
700
inside it. The contacts
700
, inside the grounded, conductive outer connector body
200
, are both effectively grounded and electromagnetically shielded.
FIG. 3
shows an exemplary coaxial contact
700
and the generally cylindrical retainer clip
400
of the present invention, which holds the contact
700
within the bore of the aperture
270
of the outer connector body
200
. The coaxial contact
700
is shown partly cut away to disclose the coaxial inner structure of center conductor
701
, dielectric insulation
703
, and outer conductor casing
705
(the grounded portion). The casing
705
comprises an annular flange
706
. The rounded tip of the center conductor
701
, at the top of
FIG. 3
, is adjacent to the aperture
270
in the assembled connector (see FIG.
2
).
The retainer clip
400
is preferably a conductive grounding clip, making electrical contact between the outside of the contact
700
and the inside of the aperture
270
in the preferably metallic outer connector body
200
, and it is preferably made of an elastic metal, such as beryllium copper, or it may be plated. Such a retainer clip
400
creates a circuit from the casing
705
of the contact outer body
700
to the outer connector body
200
. It also holds the contact
700
in position with the outer connector body
200
.
The retainer clip
400
preferably includes two inwardly protruding clip edges
472
of the retainer clip
400
, which bear against the surface of flange
706
to augment and insure the grounding connection between the retainer clip
400
and the contact
700
. The retainer clips
400
are inserted into the end of the outer connector body
200
that is on the right in FIG.
2
. The retainer clip
400
has a plurality of inwardly protruding dimples
470
and also several inwardly protruding resilient tines
490
.
FIGS. 4 and 5
show the retainer clip
400
assembled to the contact
700
in the same relative position which they have when the two are retained inside the outer connector body
200
. The ends of the tines
490
abut one side of the flange
706
, which prevents the flange from moving in the opposing direction relative to the retaining clip
400
. The dimples
470
and clip edges
472
rest on the outer cylindrical surface of the flange
706
. The dimples center the contact
700
to maintain the force of the clip edges
472
, which are intended to act primarily as a grounding contact.
FIG. 6
shows in greater detail how contact
700
and retainer clip
400
are held in the connector body
200
. At the lower side this figure shows how the end of the tine
490
abuts the other side of the flange
706
. The forward shoulder
247
of an annular space
244
is seen to abut the flange
706
and therefore it acts as a stop for the contact
700
as well as for the retainer clip
400
.
FIG. 6
also shows a space
292
into which the staking ring
92
is compressed. The staking ring
92
is not shown in
FIG. 6
, however. A space
294
which holds the ring
94
is likewise visible.
Because the flange is held by the forward interior shoulder or stop
247
on one side and by the ends of the tines
490
on the other side, the flange is held in the axial direction and the contact
700
cannot fall out.
Assembly is as follows:
The retainer clip
400
includes a longitudinal gap
444
, by which it is radially compressible. While compressed, its diameter is small enough that it can slide into the annular space
244
inside the outer connector body
200
. This annular space
244
is cylindrical, slightly longer than the retainer clip
400
, and has abrupt inward steps or shoulders at either end; and it has a diameter slightly smaller than that of the retainer clip
400
in its relaxed state (i.e., when the gap
444
is open). Therefore, the retainer clip
400
can be radially compressed and inserted into the annular space
244
, where it snaps outward by its own resilience and becomes locked in place inside the annular space
244
, against the inward stops or shoulders at either end. The end of the clip with the dimples
470
is inserted foremost into the annular space
244
in the outer connector body
200
.
The ends of the tines
490
project into the cylindrical space inside the main body of the retainer clip
400
. With the retainer clip inserted, the flange
706
of the contact
700
is able to slide through the retainer clip
400
(in the upward direction in
FIG. 3
, to the left in
FIG. 6
) by forcing the resilient tines
490
outward toward the inner wall of the annular space
244
. The tines
490
then snap inward after passing over the shoulder of the flange
706
.
Here, and in the following claims, “annular cylinder” or “cylindrical annulus” means an object or portion of an object which extends generally prismatically (i.e., with a more-or-less constant cross section) along an axis or center line and which has, in cross section, a central opening and a surrounding outer perimeter. The central opening and the outer perimeter may optionally be circular and may optionally define between them a generally constant width. While “cylindrical” usually implies a circular cross section, it does not necessarily do so herein.
Although the preferred form of the outer insert is illustrated to be shaped as an annulus of a cylinder (with a cylindrical bore opening and cylindrical outside perimeter), the inserted connector body of the present invention may have a variety of outside and inside shapes, such as polygonal, elliptical, and so on, and the inside and outside shapes need not be similar. Also, the outer connector body need not surround the inner connector body, but instead may be, for example, C-shaped.
The word “insert” can mean an inserted part of some combination or it can refer to a stand-alone element by itself, whether or not inserted into anything.
The word “cable” can refer to a cable itself and/or its termination, e.g., contacts in a connector.
Although certain presently preferred embodiments of the present invention have been specifically described herein, it will be apparent to those skilled in the art to which the invention pertains that variations and modifications of the various embodiments shown and described herein may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the invention be limited only to the extent required by the appended claims and the applicable rules of law.
Claims
- 1. An electrical connector, for connecting a first plurality of grounded cables and a second plurality of ungrounded cables, the connector comprising:for connecting the grounded cables, a conductive outer connector body including a central space and a plurality of bores holding respective ones of the grounded cables; for connecting the ungrounded cables, a non-conductive inner connector body disposed within the central space; and an electrical connection between a grounded contact of each of the grounded cables and the outer conductive body.
- 2. The connector according to claim 1, wherein the outer connector body comprises an annular cylinder and the central space passes therethrough from end to end.
- 3. The connector according to claim 1, wherein the outer body is held within a shell.
- 4. The connector according to claim 3, comprising a conductive staking ring making electrical contact between the shell and the outer connector body.
- 5. The connector according to claim 1, wherein the electrical connection comprises a metallic retainer clip making electrical contact between the grounded contact and the outer connector body.
- 6. The connector according to claim 5, wherein the retainer clip comprises a locking structure to hold the cable in one of the cable-accepting bores.
- 7. The connector according to claim 6, wherein the retainer clip is annular and is disposable in a cylindrical space inside one of the cable-accepting bores.
- 8. The connector according to claim 7, wherein and the locking structure comprises a resilient tine that projects into the cylindrical space and wherein the resilient tine snaps behind an annular shoulder of the grounded contact.
- 9. The connector according to claim 8, wherein the grounded contact comprises a flange and the flange comprises the annular shoulder.
- 10. The connector according to claim 8, wherein the outer connector body comprises a stop preventing the retainer clip from moving past a position wherein the resilient tine snaps behind the annular shoulder of the grounded contact.
- 11. The connector according to claim 10, wherein an interior shoulder of the cylindrical space comprises the stop.
- 12. The connector according to claim 8, wherein the outer connector body comprises a stop preventing the grounded contact from moving past a position wherein the resilient tine snaps behind the annular shoulder of the grounded contact.
- 13. The connector according to claim 12, wherein an interior shoulder of the cylindrical space comprises the stop.
- 14. The connector according to claim 8, wherein the retainer clip comprises a centering structure.
- 15. The connector according to claim 14, wherein the centering structure comprises a plurality of dimples.
- 16. The connector according to claim 7, wherein the retainer clip is resilient and snaps into the cylindrical space inside the one of the cable-accepting bores.
- 17. The connector according to claim 5, wherein the metallic retainer clip comprises protruding clip edges in contact with at least one of the outer connector body and the grounded cable.
- 18. In combination:a male connector housing having a first size, a conductive connector insert having a second size, and a non-conductive connector insert having a third size smaller than the second size and being assembled inside the conductive connector insert; the connector inserts being fitted inside the male connector housing and including a plurality of cable-accepting bores passing through the connector inserts from end to end; and a female connector housing having a fourth size and being fitted onto the male connector housing.
US Referenced Citations (12)