U.S. patent number 3,638,166 [Application Number 04/806,582] was granted by the patent office on 1972-01-25 for connector element.
This patent grant is currently assigned to Schaltbau Gesellschaft mbH. Invention is credited to Leo A. Steipe.
United States Patent |
3,638,166 |
Steipe |
January 25, 1972 |
CONNECTOR ELEMENT
Abstract
A connector element is disclosed which is cut from an elongated
plastic bar made by extrusion and having a longitudinal groove
lined with a conductive layer with notches being cut to form
individual socket elements.
Inventors: |
Steipe; Leo A. (Bachausen,
Starnberg, OE) |
Assignee: |
Schaltbau Gesellschaft mbH
(Munich, DT)
|
Family
ID: |
25194365 |
Appl.
No.: |
04/806,582 |
Filed: |
March 12, 1969 |
Current U.S.
Class: |
439/593; 439/629;
29/874; 439/894 |
Current CPC
Class: |
H01R
12/721 (20130101); Y10T 29/49204 (20150115) |
Current International
Class: |
H05k 001/07 () |
Field of
Search: |
;339/17F,17L,17LC,17LM,17M,59R,59M,61R,61M,176MF,176MP,217R,176M
;29/629 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Staab; Lawrence J.
Claims
I claim:
1. A connector bar for receiving plugs or other contact elements,
such as contact strips on printed circuit boards, or the like,
comprising a plastic bar having a longitudinal groove to obtain a
bottom and two walls defining essentially U-shaped cross section
and profile, the groove being lined with an electrically conductive
layer, and means to make electric contact with the layer, there
being notches traversing the walls of the bar as corresponding to
legs of the U-shaped profile and separating also the electrically
conductive layer to provide individual contact socket elements.
2. A connector bar, as in claim 1, the plastic bar having
rectangular outer cross section.
3. A connector element, as set forth in claim 1, the groove having
lip-shaped inwardly projecting bulges narrowing the entrance to the
groove.
4. A connector bar, as in claim 1, the legs of the U being selected
to be resilient.
5. A connector bar, as in claim 1, there being at least one bore
through the bar body, a wire inserted in the bore to provide
connection to the lining in the groove.
6. A connector element, comprising;
a flat, elongated base of insulative material;
a plurality of arms extending in pairs from the base integral
therewith and parallel to each other and defining two parallel
rows, the arms of a pair pertaining to different rows, each arm of
a pair of the pairs having a bulged portion on its end extending
toward the respective bulged portion of the other arm of the pair;
and
contact-making lining on at least a surface portion of at least one
arm of each pair as facing the respective other arm of the
pair.
7. A connector element as in claim 6, the arms of a pair being
resilient for resilient pivoting of the respective bulged portions
relative to each other.
Description
The present invention relates to connector elements or sockets
particularly serving as connector elements for low-power circuitry,
such as printed circuits, and to a method for making such a socket.
It is the particular object of the present invention to provide
such a connector socket element which is reliable but can be
manufactured in a simple manner and inexpensively. It is another
object of the invention to provide a simple multiconnection socket
element.
In accordance with the present invention, the connector socket
element is comprised of a plastic bar having an elongated
indentation such as a groove. The connector bar thus has
essentially U-shaped cross section lined with electrically
conductive layering. The connector element is made by first forming
an elongated bar of a plastic material, preferably in a continuous
process, the bar being provided with grooves to have U-shaped cross
section. Next, the interior of the groove is lined with an
electrically conductive layer. Next, the notches are cut into the
bar to the extent that a notch extends through the legs of the "U"
as well as through the electrically conductive layer but not
through the portion of the bar forming the bottom of the groove, so
that the element remains contiguous through that bottom portion of
the bar. Finally, connector elements are cut at desired length from
the endless string. The last two cutting steps could be reversed in
sequence. A finishing process may follow, If a connector prong to
be inserted is resilient, the plastic bar used as multiconnection
socket element does not have to be resilient in itself and can
serve as support for other elements.
While the specification concludes with claims particularly pointing
out and distinctly claiming the subject matter which is regarded as
the invention, it is believed that the invention, the objects and
features of the invention and further objects, features and
advantages thereof will be better understood from the following
description taken in connection with the accompanying drawing in
which:
FIg. 1 illustrates a cross section through a connector element in
accordance with the preferred embodiment of the invention;
FIG. 2 illustrates a perspective end view of the element shown in
FIG. 1; and
FIG. 3 illustrates in perspective view a phase of making such a
connector element.
In FIGS. 1 and 2 there is illustrated a plastic bar 1 which has
essentially rectangular cross section as to the outer contour. The
bar is provided with a longitudinal groove 2. In order to obtain
resilient engagement with connector pins to be inserted in the
groove 2, lips or bulges 3 are provided to narrow the entrance to
the groove 2. For reasons of saving material and also in order to
obtain resilient action, the (original) sidewalls 11 and 12 of the
grooved bar are rather thin, i.e., the overall cross section of the
bar is actually U-shaped with rather narrow legs of the U.
Interior of the groove is lined with an (originally contiguous)
electrically conductive layer 4. A bore such as 5 receives a
connecting wire 6 contacting the layer 4 and traversing the body of
bar 1 remote from the entrance to the groove, for example, at the
bottom 13 thereof.
Individual socket elements are formed in that the bar 1 is provided
with notches 7 giving the entire bar a comblike configuration. The
notches extend through the legs 11 and 12 of the U, but not through
the base 13 thereof, so that the individual sockets are integrally
joined by means of the remaining portion 13 of bar 1, which is not
traversed by notches 7. The notches do, however, traverse also the
layer 4 along the sidewalls 11 and 12, as well as adjacent bottom
portion 13 of the bar, for electrically separating the connecting
elements, one in each socket element. Thus, as to the connecting
element it is more correct to speak of individual contact elements
4a, 4b, etc., which have resulted from cutting notches into the
layer 4.
Each contact element is thus established by a strip of electrically
conductive layering along the bottom 13 of the bar, from which
extend contact arms 4a, 4b, etc., along the notched sidewalls 11
and 12 of the bar, which, in the illustrated configuration, are
actually individual resilient arms, 11a, 11b, 12a, 12b, etc.,
permitting some resilient pivot action on an axis which is
longitudinal to the bar. Each such arm has a beaded portion 3, and
contact-making proper will occur at the contact linings on the
beaded portions, the lining having crimped configuration but
following the contour of the bead or bulge. Of course, there must
be as many lead-in wires 6 as there are different socket elements.
A corresponding plurality of apertures 5 must be provided for
receiving the connecting lead-in wires. These apertures may be
provided in different locations, for example, near the
entrance.
The connector element can thus be considered also as being
comprised of a flat bar 13 from which extend two rows of arms 11a,
11b, etc., and 12a, 12b, etc. These arms are defined by way of
notches 7 cut into walls 11 and 12. The arms extend parallel to
each other and face each other in pairs across the space defined as
groove 2. These arms permit some resilient pivoting relative to
each other, so that the beaded portions at the entrance of groove 2
and extending towards each other as to each pair of arms from which
they extend, can clamp a contact element when inserted, to thereby
cause contact-making with the contact-making lining on the beaded
or bulging end of each arm.
The connector socket element, as described, can be made in
accordance with a first, preferred form of practicing the invention
by way of continuously extruding plastic material to obtain a bar
with essentially U-shaped cross section. In a subsequent step, an
electric layer 4 is provided, for example, by way of electrolysis
or by depositing an electrically conductive lacquer onto the
interior wall defining the groove 2. Alternatively, an emulsion can
be deposited on this interior wall of groove 2 or the layer can be
produced by vapor depositing.
It should be noted that immediately after extrusion the bar has an
elevated temperature and cools down subsequently. This, in turn, is
of advantage in that a particular temperature, when reached,
provides optimum adherence to a contact-making layer in the
interior of groove 2 when provided onto the bar at that
temperature. This is of particular importance if the layer 4 is
provided during cooling of the bar by way of depositing an
electrically conductive lacquer or by vapor depositing. In such a
case, maximum adherence can be obtained at that elevated
temperature, and the bar with its interior layer then cool
together.
Still an alternative way of producing the contact in the interior
of the socket bar, may include insertion of a metallic strip. As
shown in FIG. 3, a metallic strip 4' is guided into the groove. The
strip 4' may be reeled from a supply spool to run parallel to the
bar, particularly after the latter has been manufactured. In FIG.
3, in particular, the bar 1 may have been made of plastic by way of
extrusion molding. The bar is presumed to move in the direction of
arrow 15, for example, as leaving the molding equipment and now
passing through a region for cooling. Particularly, the bar is
shown presently to pass through a gauging element 9. Metallic strip
4' or tape travels generally with the bar 1. By means of a
stationary tool 19, the tape 4' is forced to enter the aperture on
top of the bar and into the groove thereof for being forced in
juxtaposed position to the wall defining the groove 2. In case, as
illustrated, the bar has lips narrowing the entrance to the groove
2, one can use a resilient metal strip forced into the groove for
positioning therein.
Subsequent to lining the interior of the bar with a contact-making
layer, the notches are cut to provide individual contact sockets.
The socket bar as outlined is of high advantage as a connector
socket element for making connections with terminal contacts on a
printed circuit board. Such a connector element can also be used as
a semifinished product and individual multicontact connector
elements or even individual socket elements for simple contact can
be cut from such a bar. In other words, a bar of this type can be
produced on a basis of indefinite continuous length and
multicontact connector elements can be cut therefrom at convenient
length, and for any desired number of individual contacts.
The invention is not limited to the embodiments described above but
all changes and modifications thereof not constituting departures
from the spirit and scope of the invention are intended to be
included.
* * * * *